/* ========================================
   Stay Fresh in AI — Presentation
   Premium Dark Stripe Theme
   ======================================== */

/* ─── Google Fonts are loaded in HTML ─── */

/* ─── CSS Variables ─── */
:root {
    --bg-primary: #0b0b0d;
    --bg-secondary: #111116;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.72);
    --text-muted: rgba(255, 255, 255, 0.42);
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #ec4899;
    --accent-success: #22c55e;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(139, 92, 246, 0.12) 100%);
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.10);
    --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.25);
    --transition-fast: 0.18s ease;
    --transition-smooth: 0.38s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ─── Reset ─── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    min-height: 100vh;
}

/* ─── Presentation Container ─── */
.presentation-container {
    width: 100vw;
    height: 100vh;
    position: relative;
    background-color: #0b0b0d;
    background-image:
        repeating-linear-gradient(45deg, #0b0b0d, #0b0b0d 6px, #131317 6px, #131317 7px),
        radial-gradient(ellipse at 15% 0%, rgba(99, 102, 241, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 100%, rgba(139, 92, 246, 0.05) 0%, transparent 55%);
}

/* ─── Progress Bar ─── */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: rgba(255, 255, 255, 0.06);
    z-index: 1000;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    width: 10%;
    transition: width var(--transition-smooth);
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.5);
}

/* ─── Slide Counter ─── */
.slide-counter {
    position: fixed;
    top: 20px;
    right: 30px;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    z-index: 1000;
    letter-spacing: 0.05em;
}

#currentSlide {
    color: var(--text-primary);
    font-weight: 700;
}

/* ─── Navigation Controls ─── */
.nav-controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 1000;
}

.nav-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-smooth);
}

.nav-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

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

.nav-btn svg {
    width: 20px;
    height: 20px;
}

/* ─── Keyboard Hints ─── */
.keyboard-hints {
    position: fixed;
    bottom: 30px;
    right: 30px;
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    z-index: 1000;
    letter-spacing: 0.06em;
}

/* ─── Slides Wrapper ─── */
.slides-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
}

/* ─── Individual Slide ─── */
.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 70px 90px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(40px);
    transition: all var(--transition-smooth);
    overflow-y: auto;
}

.slide.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.slide.prev {
    transform: translateX(-40px);
}

/* ─── Slide Content ─── */
.slide-content {
    max-width: 1200px;
    width: 100%;
    animation: slideIn 0.55s ease forwards;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ─── Typography ─── */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Dual-serif font classes */
.serif-title {
    font-family: 'Playfair Display', Georgia, 'Times New Roman', serif;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.serif-italic {
    font-family: 'Playfair Display', Georgia, 'Times New Roman', serif;
    font-style: italic;
    font-weight: 400;
}

/* Monospace badge labels */
.tagline-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    color: var(--accent-primary);
    text-transform: uppercase;
    display: inline-block;
    margin-bottom: 1rem;
}

/* Purple divider line */
.sub-line {
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    margin: 1.2rem 0;
    border-radius: 2px;
}

/* ─── Main Title ─── */
.main-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: clamp(2.8rem, 6vw, 5rem);
    font-weight: 400;
    line-height: 1.12;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

/* ─── Slide Titles ─── */
.slide-title {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.4rem;
    letter-spacing: -0.01em;
}

.slide-subtitle {
    font-size: clamp(0.9rem, 1.2vw, 1.05rem);
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

/* ─── Tagline Slide Layout ─── */
.tagline-slide-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 920px;
    margin: 0 auto;
}

.tagline-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: clamp(2.2rem, 4.8vw, 3.5rem);
    line-height: 1.38;
    color: #ffffff;
    font-weight: 400;
    margin-bottom: 1.5rem;
}

/* ─── Footer (Title Slide) ─── */
.footer-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 0.06em;
}

.footer-link {
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.25);
    letter-spacing: 0.06em;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--accent-primary);
}

/* ─── Title Slide ─── */
.title-slide {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tagline {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    letter-spacing: 0.02em;
}

/* ─── Logo Row (Title Slide icons) ─── */
.logo-row {
    display: flex;
    justify-content: center;
    gap: 18px;
    flex-wrap: wrap;
    margin: 1rem 0 2.5rem;
}

.logo-icon {
    width: 34px;
    height: 34px;
    object-fit: contain;
    transition: all var(--transition-smooth);
}

.logo-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 10px;
    background: transparent;
    transition: all var(--transition-smooth);
}

.logo-wrapper.light-bg {
    background: rgba(255, 255, 255, 0.92);
    border-radius: 8px;
}

.logo-wrapper:hover {
    transform: scale(1.15) translateY(-3px);
}

.logo-wrapper:hover .logo-icon {
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

/* ─── Agenda Slide ─── */
.agenda-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-width: 750px;
}

.agenda-item {
    display: flex;
    align-items: center;
    gap: 22px;
    padding: 16px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all var(--transition-smooth);
    animation: fadeInUp 0.5s ease forwards;
    animation-delay: var(--delay);
    opacity: 0;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}

.agenda-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    transform: translateX(8px);
}

.agenda-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 38px;
}

.agenda-text {
    font-size: 1.02rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ─── LLM Cards (Slide 4) ─── */
.llm-platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 22px;
    margin-bottom: 1.5rem;
}

.llm-card {
    padding: 22px;
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 16px;
    transition: all var(--transition-smooth);
}

.llm-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.llm-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.llm-icon {
    width: 30px;
    height: 30px;
    object-fit: contain;
}

.llm-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.llm-card > p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ─── Logo Wrapper Small ─── */
.logo-wrapper-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: transparent;
    flex-shrink: 0;
}

.logo-wrapper-small.light-bg {
    background: rgba(255, 255, 255, 0.92);
}

/* ─── Closing Slide ─── */
.closing-slide {
    text-align: center;
}

.closing-card {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

.closing-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    display: block;
}

.closing-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.closing-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.contact-section {
    margin-top: 2rem;
}

.questions-text {
    font-size: 1.1rem;
    color: var(--accent-primary);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .slide {
        padding: 80px 24px 100px;
    }

    .keyboard-hints {
        display: none;
    }

    .slide-counter {
        right: 20px;
    }

    .logo-row {
        gap: 12px;
    }

    .logo-icon {
        width: 26px;
        height: 26px;
    }

    .agenda-list {
        gap: 10px;
    }

    .agenda-item {
        padding: 12px 16px;
    }

    .llm-platforms-grid {
        grid-template-columns: 1fr;
    }
}

/* ─── Reduce Motion ─── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}