styles.css

.btn .arrow {
    display: inline-block;
    transform: translateY(-0.25em);
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

strong {
    font-weight: normal;
}

/* ------------------------------
   1. Font Import & Variable Setup
------------------------------ */
@font-face {
  font-family: 'Euclid Circular B';
  src: url('fonts/EuclidCircularB.woff2') format('woff2');
  font-style: normal;
  font-display: swap;
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --font-display: 'Euclid Circular B', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --color-text-default: #161615;
  --color-text-secondary: #5d5d5d;
  --brand-elevenlabs: #777;
  --brand-openai: #52a584;
  --brand-gemini: #724fd5;
}

/* Text handling player icon masks */
:root {
  --text-player-play-mask: url("data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDgiIGhlaWdodD0iNDgiIHZpZXdCb3g9IjAgMCA0OCA0OCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4gIDxjaXJjbGUgY3g9IjI0IiBjeT0iMjQiIHI9IjIzIiBmaWxsPSJub25lIiBzdHJva2U9IiNmZmZmZmYiIHN0cm9rZS13aWR0aD0iMiIvPiAgPHBhdGggZD0iTTE5IDE0Ljc1TDM0IDI0TDE5IDMzLjI1WiIgZmlsbD0iI2ZmZmZmZiIgc3Ryb2tlPSIjZmZmZmZmIiBzdHJva2Utd2lkdGg9IjIiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz48L3N2Zz4=");
  --text-player-pause-mask: url("data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDgiIGhlaWdodD0iNDgiIHZpZXdCb3g9IjAgMCA0OCA0OCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4gIDxjaXJjbGUgY3g9IjI0IiBjeT0iMjQiIHI9IjIzIiBmaWxsPSJub25lIiBzdHJva2U9IiNmZmZmZmYiIHN0cm9rZS13aWR0aD0iMiIvPiAgPHJlY3QgeD0iMTciIHk9IjE1IiB3aWR0aD0iNiIgaGVpZ2h0PSIxOCIgcng9IjIiIGZpbGw9IiNmZmZmZmYiLz4gIDxyZWN0IHg9IjI1IiB5PSIxNSIgd2lkdGg9IjYiIGhlaWdodD0iMTgiIHJ4PSIyIiBmaWxsPSIjZmZmZmZmIi8+PC9zdmc+");
}

/* ------------------------------
   2. Base Typography (h1 ~ p)
------------------------------ */
h1 {
  font-family: var(--font-display);
  font-size: 4rem;           /* 64px */
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text-default);
  font-weight: 400;
}

h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;         /* 40px */
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-text-default);
  font-weight: 400;
}

h3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  line-height: 125%;
  letter-spacing: -0.035em;
  font-weight: 300;
}

h4 {
  font-family: var(--font-body);
  font-size: 1.5rem;         /* 24px */
  line-height: 1.4;
  color: var(--color-text-default);
  font-weight: 400;
}

h5 {
  font-family: var(--font-body);
  font-size: 1.25rem;        /* 20px */
  line-height: 1.5;
  color: var(--color-text-default);
  font-weight: 400;
}

h6 {
  font-family: var(--font-body);
  font-size: 1.125rem;       /* 18px */
  line-height: 1.5;
  color: var(--color-text-default);
  font-weight: 400;
}

p {
  font-family: var(--font-body);
  font-size: 1rem;           /* 16px */
  line-height: 1.6;
  color: var(--color-text-secondary);
}

html {
  font-size: 16px; /* 기본 1rem = 16px */
  overflow-x: hidden;
  max-width: 100vw;
}

@media (max-width: 1280px) {
  html {
    font-size: 15px; /* 1rem = 15px */
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px; /* 1rem = 14px */
  }
}

:root {
  /* Primary */
  --supertone_blue: #227cff;
  --primary: var(--supertone_blue);               /* 기본 블루 */
  --primary-dark: #0849CC;          /* 호버 시 블루 */
  --primary-light: var(--supertone_blue);         /* 밝은 블루 */
  --accent: var(--supertone_blue);                /* 강조 블루 (서브 액센트) */

  /* Secondary / Highlight */
  --highlight: #f4fa7d;             /* 하이라이트 옐로우 (포인트 색) */

  /* Backgrounds */
  --light: #f2f2f2;                 /* 전체 배경 */
  --light-lighter: rgba(249, 249, 249, 1);         /* 카드/섹션 배경 */
  --light-darker: #e6e6e6;          /* 구분선/테두리 배경 */

  /* Text */
  --text: #161615;                  /* 주요 텍스트 */
  --text-secondary: #5d5d5d;        /* 보조 텍스트 */
  --text-muted: #888888;            /* 보조 텍스트 */

  /* Border */
  --border: #cccccc;                /* 기본 테두리 */

  /* Status / Semantic */
  --success: #3FB950;

  /* Gradients */
  --gradient: linear-gradient(135deg, var(--supertone_blue) 0%, var(--supertone_blue) 100%);
  --gradient-alt: linear-gradient(135deg, var(--supertone_blue) 0%, var(--supertone_blue) 100%);
}
:root {
    --demo-generate-glow-hue: 52deg;
    --demo-generate-shadow-hue: 48deg;
    --demo-generate-spring-easing: linear(
        0, 0.002, 0.01 0.9%, 0.038 1.8%, 0.156, 0.312 5.8%, 0.789 11.1%, 1.015 14.2%,
        1.096, 1.157, 1.199, 1.224 20.3%, 1.231, 1.231, 1.226, 1.214 24.6%,
        1.176 26.9%, 1.057 32.6%, 1.007 35.5%, 0.984, 0.968, 0.956, 0.949 42%,
        0.946 44.1%, 0.95 46.5%, 0.998 57.2%, 1.007, 1.011 63.3%, 1.012 68.3%,
        0.998 84%, 1
    );
    --demo-generate-spring-duration: 1.33s;
    --demo-generate-inset: 40px;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--light);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    max-width: 100vw;
    position: relative;
    font-weight: 300;
    --lightning-scroll: 0px;
    --lightning-filter: none;
}

.header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 2rem;
    pointer-events: none;
}

.header a {
    display: inline-block;
    pointer-events: auto;
}

.header-logo {
    height: 2rem;
    width: auto;
    display: block;
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
    padding: 12rem 0 4rem;
    /* cursor: pointer; */
    z-index: 0;
}

body.lightning-flicker {
    --lightning-filter: url('#lightning-flicker-filter');
}

body.lightning-flash {
    background: #ffffff;
    --lightning-filter: url('#lightning-flash-filter');
}

/* Side Navigation Dots */
.side-nav {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.nav-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    border: none;
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease;
}

.nav-dot::before {
    content: "";
    position: absolute;
    top: -8px;
    left: -8px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    pointer-events: auto;
}

.nav-dot::after {
    content: attr(data-tooltip);
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    border: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.nav-dot:hover::after {
    opacity: 1;
}

.nav-dot:hover {
    background: var(--primary);
}

.nav-dot.active {
    background: var(--primary);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

@media (max-width: 1280px) {
  .container {
    max-width: 100%;
    padding: 0 1.5rem;
  }
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
    padding: 12rem 0 4rem;
}
.hero-headings {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 2rem;
  align-items: center;
  width: 100%;
  max-width: 1200px;
  margin: 4rem auto 4rem;
}
.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: visible;
}

#lightning-bg {
    position: absolute;
    inset: 0;
    z-index: -2;
    pointer-events: none;
}

#lightning-bg .hero-lightning {
    position: absolute;
    top: 0;
    left: 3%;
    width: 100vw;
    height: auto;
    color: #ffff05;
    pointer-events: none;
    /* Removed CSS variable-based transform for direct scroll response */
    /* transform: translateY(calc(var(--lightning-scroll) * -0.45)) scale(0.76); */
    /* transform: translateY(calc(var(--lightning-scroll) * -1)) scale(0.76); */
    transform: scale(0.76);
    transform-origin: top left;
    will-change: transform;
    filter: var(--lightning-filter, none);
    z-index: -2;
}

#lightning-bg .hero-lightning path {
    fill: currentColor;
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
    padding: 12rem 0 4rem;
}

#lightning-bg svg {
    width: 100vw;
    height: auto;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: none;
    width: 100%;
    margin: 0 auto;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(10, 91, 255, 0.15);
    border: 1px solid rgba(10, 91, 255, 0.5);
    border-radius: 50px;
    color: var(--accent);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 2rem;
    animation: fadeInDown 0.6s ease-out;
}
.hero-title {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-title-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.hero-wordmark {
  width: 97%;
  height: auto;
}

.hero-subtitle {
  font-family: 'Euclid Circular B', sans-serif;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 105%;
  letter-spacing: -0.035em;
  margin: 0;
  text-align: left;
  color: #000000;
  animation: fadeInUp 0.6s ease-out 0.2s both;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: flex-start;
}

.hero-subtitle-icon {
  width: clamp(2.5rem, 5vw, 3.5rem);
  height: auto;
  flex-shrink: 0;
}

.gradient-text {
    background: linear-gradient(135deg, #0A5BFF 0%, #4D8AFF 50%, #58A6FF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}


.hero-description {
    font-family: 'Euclid Circular B', sans-serif;
    font-size: 1.4rem;
    color: #000000;
    line-height: 130%;
    letter-spacing: -0.02em;
    text-align: left;
    margin: 0;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.hero-description span {
    display: block;
}

.hero-buttons,
.business-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 6rem;
    animation: fadeInUp 0.6s ease-out 0.5s both;
}

.hero-buttons a svg,
.hero-buttons a img {
    display: none;
}

.business-buttons {
    width: 100%;
    margin-top: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.535rem;
    padding: 0.8rem 2.1rem;
    border-radius: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1rem;
    cursor: pointer;
    border: 0.0625rem solid;
    border: 1px solid;
    font-family: inherit;
    line-height: 150%;
    background: var(--light);
}

.btn-primary {
    background: var(--gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(57, 121, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(57, 121, 255, 0.5);
}

.btn-secondary {
    background: rgba(242, 242, 242, 0);
    color: var(--text);
    width: 11rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-secondary:hover {
    border-color: var(--primary);
    background: var(--light);
    transform: translateY(-2px);
}

/* Text toggle style for btn-secondary buttons */
.btn.btn-secondary.text-toggle {
    background: none;
    border: none;
    padding: 0;
    display: inline;
    font-family: inherit;
    border-radius: 0;
    box-shadow: none;
    transform: none;
    gap: 0;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    width: auto;
    justify-content: initial;
    align-items: initial;
}

.preset-icon {
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
}

.preset-icon svg {
    display: block;
}


.btn.btn-secondary.text-toggle:hover {
    opacity: 0.7;
    border-color: transparent;
    background: transparent;
    transform: none;
}

.btn.btn-secondary.text-toggle.active {
    color: var(--supertone_blue);
    text-decoration: underline;
    text-decoration-style: wavy;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--supertone_blue);
    text-underline-offset: 4px;
    border-color: transparent;
    background: transparent;
    font-weight: 400;
}

.btn.btn-secondary svg {
    color: var(--text-secondary);
}

#presetButtonGroup #presetBookBtn {
    display: none;
}

.hero-stats {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    align-self: stretch;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease-out 0.6s both;
}

.hero-stat {
    text-align: left;
    padding: 0 1.25rem;
    flex-shrink: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-stat-value {
    font-size: 8rem;
    color: var(--text);
    margin: 0;
    font-family: var(--font-display);
    line-height: 1;
    letter-spacing: -0.04em;
}

.hero-stat-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: normal;
    line-height: 1.3125rem;
    font-family: var(--font-body);
    margin-top: 0.5rem;
}

.stat {
    text-align: center;
    padding: 0 1.25rem 0 1.25rem;
    flex-shrink: 0;
    position: relative;
}

.stat-value {
    font-size: 8rem;
    color: var(--text);
    margin-bottom: 0;
    font-family: var(--font-display);
    line-height: 150%;
    letter-spacing: -0.04em;
}

.stat-label {
    font-size: 0.875rem;
    text-transform: none;
    letter-spacing: normal;
    line-height: 1.3125rem;
    font-family: var(--font-body);
    display: inline-flex;
    align-items: center;
}

.stat-arrow {
    margin-left: 0.25em;
    display: inline-block;
}

/* Section Styles */
section {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    font-family: 'IBM Plex Mono', monospace;
    color: var(--primary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
    line-height: 120%;
    text-transform: uppercase;
}

.section-title2 {
    font-size: clamp(2rem, 5vw, 3rem);
    text-align: left;
    margin-bottom: 0.25rem;
    color: var(--text);
}

.section-subtitle {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.3rem;
}

/* Benchmark Section */
.benchmark {
    padding: 5rem 0;
    width: 100%;
    margin: 0 auto;
}

.benchmark-content {
    display: flex;
    flex-direction: row;
    gap: 3.75rem;
    align-items: flex-start;
    justify-content: flex-start;
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    position: relative;
}

.comparison-container {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
}

.comparison-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.comparison-cps-image {
    max-width: 100%;
    display: block;
    margin: 0 auto;
    padding: 2rem clamp(0rem, 2vw, 2rem) 3rem;
}

.comparison-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    align-items: flex-start;
}

.comparison-header-wrapper,
.comparison-text {
    width: 100%;
}

.comparison-text p {
    text-align: center;
    line-height: 1.2rem;
    font-size: 16px;
    font-family: var(--font-body);
}

.comparison-title-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.comparison-text-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3.75rem;
    align-items: flex-start;
}



.supertonic-is-faster-than-ever {
    margin-bottom: 2rem;
}

.comparison-subtitle {
    margin-bottom: 1rem;
}


.benchmark-text-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
    justify-content: flex-start;
    flex: 1 1 0;
    max-width: 100%;
    position: relative;
}

.benchmark-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
    justify-content: flex-start;
    flex-shrink: 0;
    width: 100%;
    position: relative;
}

.benchmark-texts {
    display: flex;
    flex-direction: column;
    gap: 1.875rem;
    align-items: flex-start;
    justify-content: flex-start;
    align-self: stretch;
    flex-shrink: 0;
    position: relative;
}

.benchmark-description {
    color: var(--text-secondary);
    text-align: left;
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 150%;
    letter-spacing: -0.025em;
    position: relative;
    align-self: stretch;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin: 0;
}

.benchmark-image {
    flex: 1 1 0;
    max-width: 100%;
    position: relative;
}

.benchmark-image img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* Demo Video Section */
.intro-video {
    padding: 5rem 0;
}

.video-container {
    width: 80%;
    margin: 0 auto 1rem;
    position: relative;
    padding-bottom: 45%; /* 16:9 aspect ratio (80% * 56.25% = 45%) */
    height: 0;
    border-radius: 12px;
    overflow: hidden;
    background: var(--light);
    z-index: 1;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
}

.demo-videos-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 5rem;
}

.demo-video-item {
    display: flex;
    flex-direction: column;
}

.demo-video-item .video-container {
    width: 100%;
    margin: 0 0 1.5rem 0;
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio (9/16 * 100 = 56.25%) */
    height: 0;
    border-radius: 12px;
    overflow: hidden;
    background: var(--light);
}

.demo-video-item h3 {
    font-size: 1.5rem;
    margin: 0 0 0.75rem 0;
    color: var(--text);
}

.demo-video-item h3 a {
    color: inherit;
    text-decoration: underline;
}

.demo-video-item h3 .arrow {
    display: inline-block;
    transform: translateY(-0.25em) scale(0.75);
}

.demo-video-item p {
    margin: 0;
    line-height: 1.6;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .demo-videos-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.demo-note {
    text-align: center;
    color: #A8B3C1;
    font-size: 0.875rem; /* Reduced from 0.9375rem */
    max-width: 650px; /* Reduced from 700px */
    margin: 0 auto;
    line-height: 1.5; /* Reduced from 1.6 */
}

/* Interactive TTS Demo Section */
.interactive-demo {
    padding: 5rem 0;
}

.demo-container {
    margin: 0 auto;
    background: var(--light-lighter);
    border-radius: 12px;
    padding: 2.5rem 4.5rem;
    box-shadow: none;
}

.transformers-container {
    margin: 5rem auto 0;
    border-radius: 12px;
    box-shadow: none;
    text-align: center;
}

.supertonic-2-container {
    margin: 5rem auto 0;
    border-radius: 12px;
    box-shadow: none;
    text-align: center;
}

.supertonic-2-container p {
    color: black;
}

.transformers-logo {
    width: 100px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.supertonic-2-logo {
    width: 40%;
    display: block;
    margin: 100px auto 20px;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.supertonic-2-logo:hover {
    opacity: 0.8;
}

.supertonic-2-container a {
    text-decoration: none;
}

.supertonic-2-container .transformers-buttons .btn,
.transformers-container .transformers-buttons .btn {
    width: 14rem;
}

.transformers-container p {
    margin: 0;
    line-height: 1.6;
    color: black;
}

.transformers-container a {
    color: inherit;
    text-decoration: underline;
}

.transformers-container .btn,
.transformers-container .transformers-buttons a {
    text-decoration: none;
}

.transformers-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    margin-top: 2rem;
}

.demo-status-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    padding: 0.2rem 1rem;
    background: rgba(255, 152, 0, 0.1);
    border: 1px solid rgba(255, 152, 0, 0.3);
    border-radius: 8px;
    margin-bottom: 0rem;
    min-height: 45px;
    position: relative;
    overflow: hidden;
    --status-progress: 0%;
    --status-progress-color: rgba(255, 152, 0, 0.2);
    z-index: 0;
}

.demo-status-box::before {
    content: '';
    position: absolute;
    inset: 0;
    width: var(--status-progress, 0%);
    background: var(--status-progress-color);
    transition: width 0.4s ease;
    z-index: 0;
    pointer-events: none;
}

.demo-status-box > * {
    position: relative;
    z-index: 1;
}

.demo-status-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.demo-status-box.success {
    background: rgba(63, 185, 80, 0.1);
    border-color: rgba(63, 185, 80, 0.3);
    font-family: 'IBM Plex Mono', monospace;
    --status-progress-color: rgba(63, 185, 80, 0.2);
}

.demo-status-box.success .demo-status-text {
    color: var(--success);
}

.demo-status-box.success * {
    font-family: inherit;
}

.demo-status-text,
.demo-backend-badge.visible.webgpu,
.demo-info-banner {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    font-weight: 400;
}

.demo-status-box.error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    --status-progress-color: rgba(239, 68, 68, 0.2);
}

.demo-status-box.error .demo-status-text {
    color: #ef4444;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.demo-backend-badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background: var(--primary);
    color: white;
    border-radius: 8px;
    font-size: 0.8125rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.demo-backend-badge.visible {
    opacity: 1;
}

.demo-backend-badge.webgpu {
    background: var(--success);
}

.demo-backend-badge.wasm {
    background: #ff9800;
}

.demo-info-banner {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border: none;
    border-radius: 2px;
    margin-bottom: 1.0rem;
    color: var(--text);
    font-size: 0.8125rem;
    line-height: 1.6;
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
}

.demo-info-banner strong {
    color: #FFD54F;
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem 3rem;
    margin-bottom: 2rem;
}

/* Title row aligning with the two-column layout and center spacer */
.demo-title-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr; /* left | center spacer | right */
    align-items: center;
    margin-bottom: 1rem;
    grid-column: 1 / -1; /* span across both columns of demo-content */
    font-size: 2rem;
    font-family: var(--font-display);
    position: relative;
}

.demo-title-row::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(-1rem);
    border-bottom: 1px solid #000;
}
.demo-title-left,
.demo-title-right {
    text-align: center;
    color: var(--text);
}

/* Text animation - letters appear one by one */
.demo-title-left .letter {
    display: inline-block;
    visibility: hidden;
}

.demo-title-left .letter.visible {
    visibility: visible;
}

/* Speech animation - blur and fade in */
@keyframes speechBlurFadeIn {
    0% {
        filter: blur(40px);
        opacity: 0;
    }
    100% {
        filter: blur(0);
        opacity: 1;
    }
}

.demo-title-right.animate-speech {
    animation: speechBlurFadeIn 0.25s ease-out forwards;
}
.demo-title-center {
    text-align: center;
    color: #ff3;
    font-family: 'IBM Plex Mono', monospace;
}

.demo-title-center .lightning-icon {
    width: 4rem;
    height: 4rem;
    min-width: 4rem;
    min-height: 4rem;
    display: block;
    object-fit: contain;
    flex-shrink: 0;
}

.demo-input-section,
.demo-output-section {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-width: 0; /* Allow flex items to shrink below their minimum content size */
}

/* Ensure the input section can define a maximum height for its textarea */
.demo-input-section {
    height: 100%;
    position: relative; /* allow inner absolute positioning */
}

/* Keep label/counter in DOM for scripts, but hide visually */
.demo-input-label {
    display: none;
}

.demo-input-label {
    display: none; /* hidden but kept in DOM */
}

.demo-input-section label {
    display: block;
    color: var(--text);
    font-size: 1.125rem;
    margin: 0;
}

.demo-char-counter {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    justify-content: flex-end;
}

/* Blinking caret shown when textarea is not focused */
.demo-text-mirror {
    position: absolute;
    pointer-events: none;
    color: transparent;           /* hide mirrored text */
    white-space: pre-wrap;
    word-break: break-word;
    z-index: 2;
}

.demo-text-mirror #demoTextMirrorContent {
    /* ensure content takes same flow as textarea */
    display: block;
}

.demo-fake-caret {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--text);
    opacity: 0.6;
    animation: caret-blink 1s steps(2, start) infinite;
}

@keyframes caret-blink {
    0%, 49% { opacity: 0.6; }
    50%, 100% { opacity: 0; }
}

/* Hide fake caret while the textarea (or any child) has focus */
.demo-input-section:focus-within .demo-text-mirror {
    display: none;
}

.demo-char-counter.error,
.demo-char-counter.warning,
.demo-char-counter.valid {
    color: var(--text-muted);
}

.demo-char-counter .demo-char-status {
    color: inherit;
}

.demo-char-counter.valid .demo-char-status {
    color: #10b981;
}

.demo-char-counter.error .demo-char-status {
    color: #ef4444;
}

.demo-char-counter.warning .demo-char-status {
    color: #f59e0b;
}

.demo-char-status {
    font-size: 1rem;
    transition: all 0.2s ease;
}

.demo-input-section textarea {
    width: 100%;
    padding: 0 0.5rem;
    background: var(--light-lighter);
    border: none;
    border-radius: 0;
    color: var(--text);
    font-size: 2rem;
    font-weight: 300;
    line-height: 1.4;
    font-family: inherit;
    resize: vertical;
    transition: all 0.3s ease;
    margin-bottom: 0;
    min-height: 90px;
    height: 100%;         /* Fill parent max height by default */
    flex: 1 1 auto;       /* Grow to occupy available space in section */
}

#demoTextInput {
    border-bottom: 1px solid #000;
    overflow-y: auto;
    scrollbar-color: var(--light) transparent;
    scrollbar-width: thin;
}

#demoTextInput::-webkit-scrollbar {
    width: 10px;
}

#demoTextInput::-webkit-scrollbar-track {
    background: transparent !important;
    border: none;
}

#demoTextInput::-webkit-scrollbar-thumb {
    background: var(--light) !important;
    border-radius: 999px;
}

#demoTextInput::-webkit-scrollbar-thumb:hover {
    background: var(--light-darker) !important;
}

.demo-input-section textarea:focus {
    outline: none;
    border-color: transparent;
    background: var(--light-lighter);
}

.demo-input-section textarea::placeholder {
    color: var(--text-muted);
}

/* Make pages container resizable like the demo text input */
.pages-container {
    display: block;
}

/* Center inner elements of the text animation section */
.text-animation-container {
    display: flex;
    flex-direction: column;
    align-items: center;   /* horizontal center */
    justify-content: center; /* vertical center within its area */
    gap: 0.75rem;
}

/* Apply resize handler to the animation box (correct target) */
.animation-box {
    resize: both;
    overflow: auto;
    min-height: 120px;
    min-width: 120px;
}

.demo-controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.demo-param {
    display: flex;
    flex-direction: column;
}

.demo-param-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.35rem;
    gap: 1rem;
    font-weight: 400;
}

.demo-param label {
    font-size: 0.875rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 400;
}

.param-value {
    font-size: 0.875rem;
    color: var(--text);
}

.demo-param input[type="range"] {
    width: 100%;
    height: 18px;
    background: transparent;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    margin: 0;
    padding: 0;
}

.demo-param input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: white;
    border: 1.5px solid black;
    border-radius: 50%;
    cursor: pointer;
    margin-top: -7px;
}

.demo-param input[type="range"]::-webkit-slider-thumb:hover {
    background: white;
    border: 1.5px solid black;
}

.demo-param input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: white;
    border: 1.5px solid black;
    border-radius: 50%;
    cursor: pointer;
}

.demo-param input[type="range"]::-moz-range-thumb:hover {
    background: white;
    border: 1.5px solid black;
}

.demo-param input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 1px;
    background: #999;
    border: none;
    border-radius: 0;
}

.demo-param input[type="range"]::-moz-range-track {
    width: 100%;
    height: 1px;
    background: #999;
    border: none;
    border-radius: 0;
}

.param-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: right;
}

.voice-toggle-container {
    display: flex;
    gap: 0.75rem;
    flex: 1;
}

/* Reusable text toggle style */
.text-toggle {
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    background: none;
    border: none;
    padding: 0;
    font-family: inherit;
    font-weight: 400;
}

.text-toggle:hover {
    opacity: 0.7;
}

.text-toggle.active {
    color: var(--supertone_blue);
    text-decoration: underline;
    text-decoration-style: wavy;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--supertone_blue);
    text-underline-offset: 4px;
}

/* Voice toggle uses text-toggle style */
.voice-toggle-text {
    color: var(--text-muted);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    font-weight: 400;
}

.voice-toggle-text:hover {
    opacity: 0.7;
}

.voice-toggle-text.active {
    color: var(--supertone_blue);
    text-decoration: underline;
    text-decoration-style: wavy;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--supertone_blue);
    text-underline-offset: 4px;
    font-weight: 400;
}

.voice-toggle-text.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}


.demo-generate-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.9375rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1.5rem;
    position: relative;
    isolation: isolate;
    overflow: visible;
}

.demo-generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

#demoGenerateBtn {
    --demo-generate-base-color: #2b2913;
    --demo-generate-highlight: #ffd400;
    color: var(--demo-generate-base-color);
    font-weight: 600;
    background: #ff3;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
    transition: all var(--demo-generate-spring-duration) var(--demo-generate-spring-easing);
    position: relative;
    overflow: hidden;
}

#demoGenerateBtn img {
    flex-shrink: 0;
    transform: scale(1.3);
    transform-origin: center;
    filter: brightness(0);
}

#demoGenerateBtn::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -150%;
    width: 250%;
    height: 200%;
    background: linear-gradient(120deg, transparent 30%, hsla(var(--demo-generate-glow-hue), 100%, 80%, 0.66) 45%, hsla(var(--demo-generate-glow-hue), 100%, 90%, 0.9) 55%, transparent 70%);
    opacity: 0;
    pointer-events: none;
    transform: translate3d(0, 0, 0);
}

#demoGenerateBtn .text {
    font-weight: 400;
    color: transparent;
    background-clip: text;
    background-color: var(--demo-generate-base-color);
    background-image: linear-gradient(120deg, transparent, hsla(var(--demo-generate-glow-hue), 100%, 80%, 0.66) 40%, hsla(var(--demo-generate-glow-hue), 100%, 90%, 0.9) 50%, transparent 52%);
    background-repeat: no-repeat;
    background-size: 300% 300%;
    background-position: center 200%;
}

#demoGenerateBtn .shimmer {
    display: none;
}




#demoGenerateBtn:hover:not(:disabled),
#demoGenerateBtn.active {
    transition-duration: calc(var(--demo-generate-spring-duration) * 0.5);
    box-shadow: 0 0 30px rgba(255, 255, 0, 1),
        inset 0 0 0 1px rgba(255, 255, 255, 0.55);
}

#demoGenerateBtn:hover:not(:disabled)::after,
#demoGenerateBtn.active::after {
    opacity: 1;
    animation: demo-generate-btn-shine 0.165s ease-in 1 forwards;
}

#demoGenerateBtn:active {
    transition-duration: calc(var(--demo-generate-spring-duration) * 0.5);
}


#demoGenerateBtn:hover .text,
#demoGenerateBtn.active .text {
    animation: demo-generate-text 0.165s ease-in 1 both;
}

.demo-generate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.demo-results {
    flex: 1;
    background: var(--light-lighter);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0;
    display: flex;
    flex-direction: column;
    width: 100%;
    min-width: 0;
    overflow-x: hidden;
    grid-column: 1 / -1;
    font-family: var(--font-mono);
    font-weight: 400;
}

#demoResults {
    display: none;
}

.demo-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-muted);
}

.demo-placeholder-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.5;
    animation: float 3s ease-in-out infinite;
}

.demo-placeholder.generating .demo-placeholder-icon {
    animation: spin 2s linear infinite;
}


@keyframes demo-generate-text {
    0% {
        background-position: 100% center;
    }
    100% {
        background-position: -100% center;
    }
}

@keyframes demo-generate-btn-shine {
    0% {
        transform: translate3d(0, 0, 0);
    }
    100% {
        transform: translate3d(60%, 0, 0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.demo-placeholder p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

.demo-result-item {
    --result-progress: 0%;
    --result-title-size: 1rem;
    position: relative;
    overflow: hidden;
    z-index: 0;
    display: grid;
    grid-template-columns: 12% 40% auto;
    column-gap: 2rem;
    row-gap: 1rem;
    align-items: center;
    padding: 1rem 1.5rem;
}

body.comparison-mode .demo-result-item {
    grid-template-columns: 23% 31% auto;
}

#demoResults > .demo-result-item + .demo-result-item {
    border-top: 1px dashed #aaa;
}

.demo-result-item.supertonic-result-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: var(--result-progress, 0%);
    height: 100%;
    background: #eee;
    pointer-events: none;
    z-index: -1;
    transition: width 0.1s ease;
}

.demo-result-title {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    font-size: var(--result-title-size, 1rem);
    line-height: 1.2;
    grid-column: 1;
    justify-content: center;
    font-weight: 400;
}
.demo-result-title span {
    font-weight: 400;
}


.demo-result-title .title-status {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: none;
}

.demo-result-title .title-status.status-success {
    color: var(--success);
}

.demo-result-title .title-status.status-error {
    color: #ef4444;
}

.demo-result-title .title-status.status-running {
    color: var(--accent);
}


.demo-result-title .title-sub {
    color: var(--text-secondary);
}

.demo-result-text {
    padding: 0.75rem;
    background: var(--light-lighter);
    border-radius: 0;
    color: var(--text);
    font-size: 0.875rem;
    line-height: 1.6;
    max-height: 150px;
    overflow-y: auto;
}

.demo-result-text::-webkit-scrollbar {
    width: 6px;
}

.demo-result-text::-webkit-scrollbar-track {
    background: var(--dark-light);
    border-radius: 3px;
}

.demo-result-text::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.demo-result-text::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}



.demo-result-info {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-evenly;
    align-self: stretch;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
    grid-column: 2;
}

.demo-result-info .stat {
    text-align: center;
    padding: 0;
    flex-shrink: 0;
    position: relative;
}

.demo-result-info .stat-value {
    font-size: var(--result-title-size, 1rem);
    color: var(--text);
    margin-bottom: -0.2rem;
    line-height: 150%;
    letter-spacing: -0.04em;
    font-weight: 400;
    font-family: var(--font-mono);
    position: relative;
}

.demo-result-info .stat-label {
    color: var(--text-secondary);
    font-size: 0.7rem;
    text-transform: none;
    letter-spacing: normal;
    line-height: 1.3125rem;
    font-weight: 400;
    font-family: var(--font-mono);
}

.demo-result-info .stat-value .stat-label.stat-suffix {
    margin-left: 0.1rem;
    font-size: 0.7rem;
    line-height: 1;
}

.demo-result-info .stat-value .stat-value-segment {
    position: relative;
    display: inline-block;
}

.demo-result-info .stat-value .stat-value-number {
    display: inline-block;
    transition: color 0.3s ease, transform 0.3s ease;
}

#demoResults.quote-mode .stat-value-number {
    transition-duration: 0.1s;
}

.demo-result-info .stat-value .stat-prefix {
    position: absolute;
    top: 0.2rem;
    left: -2.3rem;
    transform: scale(0.8);
    line-height: 1;
}


.demo-result-item audio {
    width: 100%;
    height: 48px;
    border-radius: 8px;
    margin-top: 0.5rem;
}

.demo-result-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-left: auto;
}

.demo-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    background: transparent;
    color: var(--text);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: color 0.2s ease, transform 0.2s ease;
}

.demo-download-btn:hover {
    color: var(--primary);
    transform: scale(1.05);
}

.demo-download-btn svg {
    width: 16px;
    height: 16px;
}

.demo-error {
    display: none;
    padding: 0.75rem 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #ef4444;
    font-size: 0.875rem;
    line-height: 1.4;
}

.demo-error.active {
    display: block;
}

/* ElevenLabs API Key Input */
.demo-elevenlabs-config {
    display: flex;
    flex-direction: row;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0;
    background: none;
    border: none;
}

.demo-elevenlabs-config input {
    flex: 1 1 0;
    width: 100%;
    padding: 0.5rem;
    background: var(--light-lighter);
    border: none;
    border-bottom: 1px solid #000;
    border-radius: 0;
    color: var(--text);
    font-size: 0.8rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 300;
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .demo-elevenlabs-config {
        flex-direction: column;
    }
}

.demo-elevenlabs-config input:focus {
    outline: none;
    border-bottom-color: var(--primary);
}

.demo-elevenlabs-config input::placeholder {
    color: var(--text-muted);
    font-family: inherit;
}

.demo-api-keys-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text);
    font-weight: 400;
}

.demo-api-keys-label svg {
    color: #000;
}

/* Performance Comparison Table */
.demo-comparison-section {
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 0;
    background: var(--light-lighter);
    border: 1px solid var(--border);
    border-radius: 0;
}

.demo-comparison-title {
    font-size: 1.125rem;
    color: var(--text);
    margin-bottom: 1rem;
    text-align: center;
}

.demo-comparison-table {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-x: auto;
}

.demo-comparison-header,
.demo-comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 1.2fr 1.2fr;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 8px;
    align-items: center;
}

.demo-comparison-header {
    background: var(--dark);
    font-size: 0.8125rem;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.demo-comparison-row {
    background: var(--dark);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.demo-comparison-row:hover {
    border-color: var(--accent);
    background: rgba(10, 91, 255, 0.05);
}

.demo-comparison-row.winner {
    border-color: var(--success);
    background: rgba(63, 185, 80, 0.05);
}

.demo-comparison-cell {
    font-size: 0.875rem;
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.demo-comparison-cell strong {
    font-size: 0.9375rem;
}

.system-badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.system-badge.supertonic {
    background: rgba(63, 185, 80, 0.2);
    color: var(--success);
}

.system-badge.elevenlabs {
    background: rgba(10, 91, 255, 0.2);
    color: var(--accent);
}

.demo-comparison-cell.status-running {
    color: #ff9800;
}

.demo-comparison-cell.status-success {
    color: var(--success);
}

.demo-comparison-cell.status-error {
    color: #ef4444;
}

.demo-comparison-cell.fastest {
    color: var(--success);
}

/* Natural Text Handling Section */
.text-handling {
    background: var(--dark);
    padding: clamp(3rem, 7vw, 6rem) 0;
}

.text-handling .section-heading {
    text-align: center;
    margin: 0 auto clamp(2.5rem, 5vw, 3.5rem);
    max-width: 640px;
}

.text-handling-grid {
    max-width: 1020px;
    margin: 0 auto;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.text-handling-card {
    --provider-color: var(--supertone_blue);
}

.text-handling-card {
    background: var(--light-lighter);
    min-height: 100%;
}

.text-handling-card:hover {
    transform: none;
}

.text-handling-card-body {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    height: 100%;
}

.text-handling-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
}

.text-handling-top > div:first-child {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.text-handling-label {
    font-size: 1.5rem;
}

.text-handling-desc {
    font-size: 0.8rem;
    line-height: 1.2rem;
    font-family: var(--font-body);
}

.text-handling-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    padding-top: 0.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid rgba(8, 19, 33, 0.12);
    width: 100%;
}

.provider-option {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1.5rem;
    border: 1px solid rgba(8, 19, 33, 0.12);
    background: transparent;
    color: rgba(8, 19, 33, 0.65);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.provider-option.active {
    color: var(--text);
    background: rgba(255, 255, 255, 0.9);
}

.provider-option[data-provider="Supertone"].active {
    border-color: var(--supertone_blue);
    box-shadow: 0 0px 10px rgba(34, 124, 255, 0.5);
}

.provider-option[data-provider="ElevenLabs"].active {
    border-color: var(--brand-elevenlabs);
    box-shadow: 0 0px 10px rgba(153, 153, 153, 0.5);
}

.provider-option[data-provider="OpenAI"].active {
    border-color: var(--brand-openai);
    box-shadow: 0 0px 10px rgba(82, 165, 132, 0.5);
}

.provider-option[data-provider="Gemini"].active {
    border-color: var(--brand-gemini);
    box-shadow: 0 0px 10px rgba(114, 79, 213, 0.5);
}

.provider-option-icon {
    width: 85%;
    height: 85%;
    display: inline-block;
    max-width: 0.9rem;
    max-height: 0.9rem;
}

.provider-option[data-provider="Gemini"] .provider-option-icon {
    width: 100%;
    height: 100%;
}

.provider-option[data-provider="Microsoft"] .provider-option-icon {
    width: 72.25%;
    height: 72.25%;
}

.text-handling-player {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: none;
    background: transparent;
    box-shadow: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    color: var(--provider-color, var(--supertone_blue));
    flex-shrink: 0;
    margin-left: auto;
}

.text-handling-player.is-playing {
    background: transparent;
    box-shadow: none;
}

.text-handling-player::before {
    content: "";
    width: 100%;
    height: 100%;
    display: inline-flex;
    background-color: currentColor;
    -webkit-mask: var(--text-player-play-mask) center / contain no-repeat;
    mask: var(--text-player-play-mask) center / contain no-repeat;
    transition: background-color 0.8s ease;
}

.text-handling-player.is-playing::before {
    -webkit-mask-image: var(--text-player-pause-mask);
    mask-image: var(--text-player-pause-mask);
}

.text-handling-card .text-handling-sample {
    font-size: 1.1rem;
    line-height: 1.8rem;
    color: rgba(8, 19, 33, 0.85);
    padding: 0.5rem 0;
}

.text-highlight {
    color: var(--provider-color, var(--primary));
    font-weight: 400;
    transition: color 0.8s ease;
    text-decoration-line: underline;
    text-decoration-style: wavy;
    text-decoration-thickness: 1px;
    text-decoration-color: currentColor;
    text-underline-offset: 0.25em;
}

.text-handling-footer {
    margin-top: auto;
    padding-top: 0;
    display: flex;
    justify-content: flex-start;
    width: 100%;
}

.text-handling-card .text-model {
    background: #f9f9f9;
    border-radius: 0.5rem;
    border: 0.05rem solid #cccccc;
    padding: 0.25rem 0.75rem;
    display: inline-flex;
    flex-direction: row;
    gap: 0.5rem;
    align-items: center;
    justify-content: flex-start;
    height: 2rem;
    width: auto;
}

.text-handling-card .text-model-label {
    color: #4d4d4d;
    font-size: 0.875rem;
    line-height: 1.3125rem;
    font-weight: 400;
}

.text-model-icon {
    width: 0.85rem;
    height: 0.85rem;
    display: inline-block;
    flex-shrink: 0;
}

@media (max-width: 1024px) {
    .text-handling-grid {
        grid-template-columns: 1fr;
    }
}

/* Features Section */
.built-with {
    background: var(--dark);
    padding: clamp(3rem, 7vw, 6rem) 0;
}

.built-with-list {
    max-width: 1020px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.built-with-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .75rem 0;
    border-bottom: 1px solid var(--light-darker);
}

.built-with-item:last-child {
    border-bottom: none;
}

.built-with-content {
    flex: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1rem;
}

.built-with-name {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.5;
    min-width: 140px;
    flex-shrink: 0;
}

.built-with-desc {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.built-with-links {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-shrink: 0;
    margin-left: 1.5rem;
}

.built-with-links .btn {
    width: 100px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    white-space: nowrap;
    background: #ddd;
    border: 0px solid;
    border-radius: .6rem;
}

.built-with-link {
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    white-space: nowrap;
    background: var(--light);
    border-color: var(--border);
}

.built-with-link:hover {
    border-color: var(--primary);
    background: var(--light);
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .built-with-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .built-with-links {
        margin-left: 150px;
        flex-wrap: wrap;
    }
}

.features {
    background: var(--dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 1fr;
    gap: 2rem;
    margin: 0 auto;
}

.features-grid.text-handling-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.features-grid.text-handling-grid .feature-card h3 {
    margin-bottom: 0.3rem;
}

.feature-card {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 2rem;
    border-radius: 24px;
    transition: all 0.3s ease;
    background: var(--light-lighter);
}

.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    box-shadow: 0 0px 30px rgba(0, 0, 0, 0.1);
}

.feature-card.text-handling-card:hover,
.text-handling-card:hover {
    transform: none;
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: baseline;
    justify-content: flex-start;
    flex-shrink: 0;
}

.feature-icon img {
    width: 55%;
    height: auto;
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text);
    font-family: var(--font-body);
    line-height: 120%;
    font-weight: 300;
}

.feature-card > p {
    line-height: 150%;
    font-size: 1rem;
    font-family: var(--font-body);
    letter-spacing: -0.02em;
}

/* Languages Section */
/* Languages Section - features2 style layout */
.languages-layout {
    display: grid;
    grid-template-columns: 4fr 6fr;
    grid-template-rows: auto auto;
    gap: 3.75rem 5.75rem;
    width: 100%;
    max-width: 75rem;
    margin: 0 auto;
}

.languages-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
}

.languages-text-section {
    display: flex;
    flex-direction: column;
    gap: 3.75rem;
    align-items: flex-start;
    justify-content: flex-start;
    position: relative;
}

.languages-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
    justify-content: flex-start;
    flex-shrink: 0;
    width: 100%;
    position: relative;
}

.languages-subtitle {
    text-align: left;
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    font-size: 2.5rem;
}

.languages-placeholder .languages-code-card {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 0px 80px rgba(22, 22, 21, 0.1);
}

.languages-placeholder .languages-tablist {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    background: none;
}

.languages-placeholder .languages-tablist .language-option:first-child {
    padding-left: 1rem;
}

.languages-placeholder .languages-tablist .language-option:last-child {
    padding-right: 1rem;
}
.language-option {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 1.2rem 1.3rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 400;
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.language-option img {
    width: 13px;
    height: 13px;
    display: none;
}

.language-option.active img {
    display: block;
}

.language-option .language-label {
    font-weight: inherit;
}

.language-option.active {
    color: var(--text);
    border-bottom-color: var(--supertone_blue);
    background: rgba(34, 124, 255, 0.1);
}

@media (max-width: 768px) {
    .languages-tablist .language-option {
        padding: 1.2rem 0.5rem;
    }

    .languages-tablist .language-option.active .component-2 {
        display: none;
    }

    .language-option[data-language="javascript"] .language-label {
        font-size: 0;
        line-height: 0;
    }

    .language-option[data-language="javascript"] .language-label::after {
        content: "JS";
        font-size: 0.875rem;
        line-height: 1;
        display: inline-block;
        vertical-align: baseline;
    }
}

.language-option:focus-visible {
    outline: 2px solid var(--supertone_blue);
    outline-offset: 2px;
}

.languages-placeholder .languages-code-body {
    background: #ddd;
    padding: 1.5rem 1.75rem;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    min-height: 330px;
    position: relative;
}

.code-snippet {
    flex: 1;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text);
    background: transparent;
    border: none;
    white-space: pre-wrap;
    word-break: break-word;
}

.code-snippet .token-command {
    color: var(--supertone_blue);
}

.code-snippet .token-heading {
    display: inline-block;
    font-weight: 500;
    color: var(--supertone_blue);
}

.code-snippet .token-argument {
    color: #000;
}

.code-copy-btn {
    position: absolute;
    right: 1.25rem;
    bottom: 1.25rem;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: #ccc;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.code-copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(34, 124, 255, 0.2);
    background: rgba(34, 124, 255, 0.18);
}

.code-copy-btn:focus-visible {
    outline: 2px solid var(--supertone_blue);
    outline-offset: 2px;
}

.code-copy-btn img {
    width: 16px;
    height: 16px;
    display: block;
}

.code-copy-toast {
    position: absolute;
    right: 1.25rem;
    bottom: 3.75rem;
    background: rgba(22, 22, 21, 0.85);
    color: #fff;
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    opacity: 0;
    transform: translateY(8px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.code-copy-toast.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.languages-icons-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    justify-content: flex-start;
    grid-column: 1 / -1;
}

.languages-icons-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2.5rem;
    align-items: center;
    justify-content: center;
}

.language-icon {
    width: 86px;
    height: 86px;
    border-radius: 12px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.language-icon:hover {
    border-color: var(--supertone_blue);
}

.language-icon img {
    width: 45px;
    height: 45px;
    display: block;
}

.language-icon.active {
    border-color: var(--supertone_blue);
    box-shadow: 0 0px 20px rgba(34, 124, 255, 0.2);
    background: #e9f2ff;
    transform: translateY(-4px);
}

.language-icon:focus-visible {
    outline: 2px solid var(--supertone_blue);
    outline-offset: 2px;
}

/* Research Papers Section */
.research-papers {
    padding: 5rem 0;
}

.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem; /* Reduced from 2rem */
    margin-bottom: 2rem; /* Reduced from 3rem */
}

.paper-card {
    text-decoration: none;
    background: #ececec;
    padding: 2rem;
    border-radius: 1.5rem;
    border: 0.0625rem solid var(--border);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
}

.paper-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(57, 121, 255, 0.15);
}

.paper-card:focus-visible {
    outline: 0.125rem solid var(--primary);
    outline-offset: 0.25rem;
}

.paper-card h3 {
    font-size: 1.25rem;
    line-height: 120%;
    margin-bottom: 0.75rem;
    color: var(--text);
    font-family: var(--font-body);
    font-weight: 300;
}

.paper-authors {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-style: normal;
    font-family: var(--font-body);
    line-height: 150%;
}

.paper-description {
    line-height: 150%;
    margin-bottom: 1.25rem;
    flex-grow: 1;
    font-size: 1rem;
    font-family: var(--font-body);
    letter-spacing: -0.02em;
}

.paper-highlight {
    color: var(--supertone_blue);
    text-decoration: underline;
    text-decoration-style: wavy;
    text-decoration-color: var(--supertone_blue);
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
}

.paper-highlight:hover {
    color: var(--primary);
    text-decoration-color: var(--primary);
}

.paper-link {
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0;
    color: var(--text);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    line-height: 1.3125rem;
    position: relative;
}

.paper-link .link-text {
    text-decoration: none;
}


.paper-link .arrow {
    transform: translateY(-0.2em);
    margin-left: 0.4rem;
}

/* Business Inquiry Section */
.business-inquiry {
    background: var(--light);
    padding: 3rem 0 4rem;
}

.business-content {
    display: flex;
    gap: 4rem;
    align-items: stretch;
    max-width: 1280px;
    margin: 0 auto;
}

.business-text {
    flex: 1 1 100%;
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Footer */
.footer {
    background: var(--light);
    padding: 2.5rem 0;
    border-top: 1px solid #000;
}

.footer-content {
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-content p {
    color: #000;
    margin: 0;
    font-size: 0.9375rem;
}

.footer-content strong {
    font-size: 1.125rem;
}

.footer-content a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-content a:hover {
    color: var(--primary);
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    margin-left: auto;
}

.footer-links a {
    color: #000;
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--text);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ↓ 1440px 이하 */
@media (max-width: 1440px) {
    .container {
        max-width: 1200px;
        padding: 0 2rem;
    }

    .hero-title {
        font-size: clamp(2.75rem, 7vw, 5.5rem);
    }
}

/* ↓ 1280px 이하 */
@media (max-width: 1280px) {
    .container {
        max-width: 1100px;
        padding: 0 2rem;
    }

    .hero-title {
        font-size: clamp(2.5rem, 6.5vw, 5rem);
    }
}

/* ↓ 768px 이하 */
@media (max-width: 768px) {
    .side-nav {
        right: 0.5rem;
        gap: 0.75rem;
    }

    .nav-dot {
        width: 8px;
        height: 8px;
    }

    #lightning-bg .hero-lightning {
        /* Removed CSS variable-based transform for direct scroll response */
        /* transform: translateY(calc(var(--lightning-scroll) * -0.45)) translateX(-10%) scale(1.3); */
        /* transform: translateY(calc(var(--lightning-scroll) * -1)) translateX(-10%) scale(1.3); */
        transform: translateX(-10%) scale(1.3);
        transform-origin: top center;
    }

    .nav-dot::before {
        display: none;
    }

    .container {
        padding: 0 1.5rem;
    }

    section {
        padding: 4rem 0;
    }

    .hero {
        padding: 12rem 0 4rem;
    }

    .hero-stats {
        gap: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .features-grid.text-handling-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        display: grid;
        grid-template-columns: auto 1fr;
        align-items: flex-start;
    }

    .feature-card.text-handling-card {
        display: flex;
        flex-direction: column;
        grid-template-columns: none;
    }

    .text-handling-card-body {
        width: 100%;
    }

    .feature-card .feature-icon {
        grid-column: 1;
        grid-row: 1;
        height: auto;
    }

    .feature-card h3,
    .feature-card > p {
        grid-column: 2;
    }

    .text-handling-player {
        width: 3rem !important;
        height: 3rem !important;
        min-width: 3rem;
        min-height: 3rem;
        flex-shrink: 0;
    }

    .comparison-subtitle {
        text-align: center;
    }

    .benchmark-content {
        flex-direction: column;
        gap: 2rem;
        max-width: 100%;
    }

    .comparison-container {
        gap: 2rem;
        max-width: 100%;
    }

    .comparison-content {
        gap: 1.5rem;
    }


    .benchmark-text-section {
        width: 100%;
        max-width: 100%;
    }

    .benchmark-image {
        width: 100%;
        max-width: 100%;
        height: auto;
        aspect-ratio: 571/392;
    }

    .benchmark-title {
        font-size: 1.75rem;
    }

    .benchmark-description {
        font-size: 1rem;
    }

    .languages-layout {
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        max-width: 100%;
    }

    .languages-placeholder,
    .languages-text-section,
    .languages-icons-container {
        width: 100%;
        max-width: 100%;
    }

    .languages-placeholder .languages-code-card {
        width: 100%;
    }

    .languages-icons-container {
        margin-top: 0.5rem;
    }

    .languages-code-body {
        padding: 1.25rem;
    }

    .language-option {
        padding: 1.2rem 0.2rem;
    }

    .languages-icons-grid {
        justify-content: center;
        gap: 1rem;
    }

    .language-icon {
        width: 72px;
        height: 72px;
    }

    .hero-buttons,
    .business-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-secondary {
        width: auto;
        display: inline-block;
    }

    .btn {
        justify-content: center;
    }

    .video-container {
        width: 100%;
        padding-bottom: 56.25%; /* 16:9 aspect ratio */
    }

    .tabs {
        gap: 0.5rem;
    }

    .papers-grid {
        grid-template-columns: 1fr;
    }

    .paper-card {
        padding: 2rem;
    }

    .hero-headings {
        grid-template-columns: 1fr;
        gap: 3rem;
        align-items: flex-start;
        margin: 4rem auto 2rem;
    }

    .hero-headings .hero-subtitle,
    .hero-headings .hero-description {
        align-self: flex-start;
        text-align: left;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
    }

    .footer-links {
        justify-content: center;
        gap: 1.5rem;
        margin-left: 0;
    }

    .footer {
        padding: 2.5rem 0 1.5rem;
    }

    .footer-text {
        margin-left: 0;
        text-align: center;
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }

    .footer-logo {
        margin: 0 auto;
    }

    .business-content {
        flex-direction: column;
        gap: 2rem;
    }

    .business-text {
        max-width: 100%;
    }

    /* Interactive Demo Responsive */
    .interactive-demo {
        padding: 3rem 0 !important;
    }

    .demo-container {
        padding: 1rem;
    }

    .demo-content {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .demo-controls {
        grid-template-columns: 1fr;
        gap: 0.875rem;
    }

    .demo-param-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 0.5rem;
        flex-wrap: nowrap;
    }

    .param-hint {
        font-size: 0.6875rem;
    }

    .demo-status-box {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.625rem 0.875rem;
    }

    .demo-status-content {
        width: 100%;
    }

    .demo-info-banner {
        padding: 0.25rem 0.4rem;
        font-size: 0.75rem;
    }

    .demo-results {
        min-height: 200px;
        padding: 0;
        overflow-x: hidden;
    }

    .demo-output-section {
        width: 100%;
        min-width: 0;
        overflow: hidden;
    }

    .demo-result-title {
        flex-direction: row;
        flex-wrap: nowrap;
        align-items: center;
        gap: 0.5rem;
    }

    .demo-result-info {
        gap: 0.75rem;
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .demo-result-info .stat {
        padding: 0;
        flex: 1 1 calc(50% - 0.4rem);
        min-width: 0;
    }

    .demo-result-info .stat:first-child {
        flex-basis: 100%;
    }

    .demo-result-info .stat-value {
        font-size: 1.5rem;
    }

    .demo-result-info .stat-label {
        font-size: 0.7rem;
    }

    .demo-char-counter {
        justify-content: flex-end;
        text-align: right;
        width: 100%;
    }
    
    .hero-stat-value,
    .stat-value {
        font-size: 5rem;
    }

    /* Comparison Table Responsive */
    .demo-comparison-section {
        padding: 0;
    }

    .demo-comparison-title {
        font-size: 1rem;
    }

    .demo-comparison-header,
    .demo-comparison-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .demo-comparison-header {
        display: none;
    }

    .demo-comparison-cell {
        border-bottom: 1px solid var(--border);
        padding-bottom: 0.5rem;
    }

    .demo-comparison-cell:last-child {
        border-bottom: none;
    }

    .demo-comparison-cell::before {
        content: attr(data-label);
        font-size: 0.75rem;
        color: var(--text-muted);
        text-transform: uppercase;
        display: block;
        margin-bottom: 0.25rem;
    }

    .demo-elevenlabs-config {
        padding: 0.75rem;
    }

    .demo-elevenlabs-config label {
        font-size: 0.75rem;
    }

    .demo-elevenlabs-config input {
        font-size: 0.75rem;
    }

    .hero {
        padding: 7rem 0 4rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--primary);
    color: white;
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f2f2f2;
}

::-webkit-scrollbar-thumb {
    background: var(--dark-light);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

:where(.bg-white)::-webkit-scrollbar-track,
:where(.bg-white):is(.dark *)::-webkit-scrollbar-track {
    background: transparent !important;
}

/* Custom Audio Player Styles */
.custom-audio-player {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    margin-top: 0;
    border: 1px solid rgba(255, 255, 255, 0.08);
    font-weight: 400;
    grid-column: 3;
    width: 100%;
    flex-wrap: wrap;
}

.player-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: #ddd;
    color: var(--bg-dark);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.player-btn svg {
    width: 24px;
    height: 24px;
    display: block;
    pointer-events: none;
}

.player-btn:hover {
    background: var(--supertone_blue);
    transform: scale(1.05);
}

.player-btn:active {
    transform: scale(0.95);
}

.demo-result-item.supertonic-result-item .player-btn:hover,
.demo-result-item.supertonic-result-item .player-btn:focus-visible {
    background: var(--supertone_blue);
    color: #fff;
}

.demo-result-item.elevenlabs-result-item .player-btn:hover,
.demo-result-item.elevenlabs-result-item .player-btn:focus-visible {
    background: var(--brand-elevenlabs);
    color: #fff;
}

.demo-result-item.openai-result-item .player-btn:hover,
.demo-result-item.openai-result-item .player-btn:focus-visible {
    background: var(--brand-openai);
    color: #fff;
}

.demo-result-item.gemini-result-item .player-btn:hover,
.demo-result-item.gemini-result-item .player-btn:focus-visible {
    background: var(--brand-gemini);
    color: #fff;
}

.custom-audio-player .time-display {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
    min-width: 42px;
    text-align: center;
    flex-shrink: 0;
}

.progress-container {
    flex: 1;
    cursor: pointer;
    padding: 0.5rem 0;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.progress-bar:hover {
    height: 8px;
    transition: height 0.2s ease;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--provider-color, var(--supertone_blue)) 0%, rgba(34, 124, 255, 0.5) 100%);
    border-radius: 3px;
    transition: width 0.1s linear;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: var(--provider-color, var(--supertone_blue));
    border-radius: 50%;
    box-shadow: 0 0 8px var(--provider-color, rgba(34, 124, 255, 0.6));
    opacity: 0;
    transition: opacity 0.2s ease;
}

.progress-container:hover .progress-fill::after {
    opacity: 1;
}

.supertonic-result-item {
    --provider-color: var(--supertone_blue);
}

.elevenlabs-result-item {
    --provider-color: var(--brand-elevenlabs);
}

.openai-result-item {
    --provider-color: var(--brand-openai);
}

.gemini-result-item {
    --provider-color: var(--brand-gemini);
}

.elevenlabs-result-item .progress-fill {
    background: linear-gradient(90deg, var(--brand-elevenlabs) 0%, rgba(153, 153, 153, 0.5) 100%);
}

.openai-result-item .progress-fill {
    background: linear-gradient(90deg, var(--brand-openai) 0%, rgba(82, 165, 132, 0.5) 100%);
}

.gemini-result-item .progress-fill {
    background: linear-gradient(90deg, var(--brand-gemini) 0%, rgba(114, 79, 213, 0.5) 100%);
}


#presetControlsRow {
    display: flex;
    gap: 0.8rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    color: #000;
}

#presetButtonGroup {
    display: flex;
    gap: 0.7rem;
    flex-wrap: wrap;
}



@media (max-width: 768px) {
    .demo-result-item {
        grid-template-columns: 1fr;
        padding: 1rem 0;
    }

    .demo-result-title,
    .demo-result-info,
    .custom-audio-player {
        grid-column: 1;
    }

    .custom-audio-player {
        width: 100%;
        padding: 0 1rem;
    }

    #demoTextInput {
        height: 168px;
    }

}

#demoGenerateBtn:disabled {
    box-shadow: none;
}

#demoGenerateBtn:disabled .shimmer {
    display: none;
}

#demoComparisonSection {
    display: none !important;
}

.business-text h2 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

.business-subheadline {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.125rem;
    font-weight: 300;
    margin: 0;
}

.business-buttons .btn {
    background: #eee;
}

.footer-logo {
    width: 48px;
    height: auto;
    display: block;
}

.footer-text {
    margin-left: 0;
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    flex: 1 1 auto;
}


@media (max-width: 768px) {
    .footer-content {
        align-items: center;
        text-align: center;
    }

    .footer-text {
        flex-direction: column;
        align-items: center;
        gap: 0.3em;
        padding: 1rem 0 0rem;
    }
}

/* ------------------------------
   Billing Confirmation Modal
------------------------------ */
.billing-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.billing-modal.show {
    display: flex;
    animation: modalFadeIn 0.2s ease-out;
}

.billing-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: overlayFadeIn 0.2s ease-out;
}

.billing-modal-content {
    position: relative;
    background: white;
    border-radius: 1.25rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 100%;
    overflow: hidden;
    animation: modalSlideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.billing-modal-header {
    padding: 2rem 2rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--light-darker);
}

.billing-modal-icon {
    color: #ef4444;
    margin-bottom: 1rem;
    animation: iconPulse 0.5s ease-out;
}

.billing-modal-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text);
    margin: 0;
}

.billing-modal-body {
    padding: 2rem;
}

.billing-modal-message {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 0 1.5rem 0;
    line-height: 1.6;
}

.billing-modal-details {
    background: var(--light);
    border-radius: 0.75rem;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.billing-detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.billing-detail-item:not(:last-child) {
    border-bottom: 1px solid var(--light-darker);
}

.billing-detail-label {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.billing-detail-value {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text);
    font-weight: 600;
}

.billing-modal-warning {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: #fff9e6;
    border-left: 3px solid #ffc107;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin: 0;
    line-height: 1.5;
}

.billing-modal-footer {
    display: flex;
    gap: 1rem;
    padding: 1.5rem 2rem 2rem;
    border-top: 1px solid var(--light-darker);
}

.billing-modal-btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border-radius: 0.75rem;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    outline: none;
}

.billing-modal-btn-cancel {
    background: var(--light);
    color: var(--text);
    border: 1px solid var(--border);
}

.billing-modal-btn-cancel:hover {
    background: var(--light-darker);
    transform: translateY(-1px);
}

.billing-modal-btn-cancel:active {
    transform: translateY(0);
}

.billing-modal-btn-confirm {
    background: var(--supertone_blue);
    color: white;
}

.billing-modal-btn-confirm:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(34, 124, 255, 0.3);
}

.billing-modal-btn-confirm:active {
    transform: translateY(0);
}

/* Modal Animations */
@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes overlayFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes iconPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* Mobile Responsive */
@media (max-width: 640px) {
    .billing-modal-content {
        max-width: calc(100% - 2rem);
    }
    
    .billing-modal-header {
        padding: 1.5rem 1.5rem 1rem;
    }
    
    .billing-modal-body {
        padding: 1.5rem;
    }
    
    .billing-modal-footer {
        flex-direction: column;
        padding: 1rem 1.5rem 1.5rem;
    }
    
    .billing-modal-btn {
        width: 100%;
    }
}