/* ==========================================================================
   Design System & Base Styles — rag_bible
   ========================================================================== */

/* --- Design Tokens --- */

:root {
  /* Backgrounds */
  --color-bg: #f5f0e8;
  --color-bg-alt: #ece6dc;
  --color-bg-card: #faf6ef;
  --color-sidebar-bg: #e3ddd2;

  /* Text */
  --color-text: #3a3a3a;
  --color-text-card: #3d3832;
  --color-text-inverse: #ffffff;
  --color-text-muted: #8a8a8a;

  /* Accent & Interactive */
  --color-accent: #9c7a5a;
  --color-highlight: rgba(156, 122, 90, 0.12);
  --color-border: #d5cfc4;

  /* Score Badges */
  --color-score-high: #7A8B6F;
  --color-score-mid: #A49768;
  --color-score-low: #B49E82;
  --color-score-minimal: #D5CFC6;

  /* Feedback */
  --color-feedback-error: #d4896d;

  /* Typography */
  --font-ui: system-ui, -apple-system, sans-serif;
  --font-scripture: 'Crimson Text', Georgia, serif;
  --font-size-base: clamp(0.938rem, 0.875rem + 0.25vw, 1.063rem);
  --line-height-base: 1.6;
  --line-height-scripture: 1.8;

  /* Spacing (8px base) */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;

  /* Layout */
  --max-width: 960px;
  --sidebar-width: 280px;
  --card-width: 480px;
  --touch-target-mobile: 44px;
  --touch-target-desktop: 40px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Focus */
  --focus-offset: 2px;

  /* Transitions */
  --transition-smooth: 500ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-quick: 150ms ease-out;

  /* Cross-browser */
  color-scheme: light;
}

/* --- Reset & Base --- */

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

body {
  font-family: var(--font-ui);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md);
  padding-left: calc(var(--space-md) + env(safe-area-inset-left, 0px));
  padding-right: calc(var(--space-md) + env(safe-area-inset-right, 0px));
  padding-bottom: calc(var(--space-md) + env(safe-area-inset-bottom, 0px));
  -webkit-font-smoothing: antialiased;
  scrollbar-gutter: stable;
}

/* --- Hero Section (full-viewport landing) --- */

.hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

.hero-section::before {
  content: "";
  flex: 2 0 0px;
}

.hero-section::after {
  content: "";
  flex: 3 0 0px;
}

/* --- Scroll Hint --- */

.scroll-hint {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-accent);
  opacity: 0.5;
  animation: scroll-hint-bob 2.5s ease-in-out infinite;
  transition: opacity 400ms ease-out;
  pointer-events: none;
}

.scroll-hint.faded {
  opacity: 0;
}

@keyframes scroll-hint-bob {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* --- Utilities --- */

/* Intentional !important: .hidden is a global override utility */
.hidden {
  display: none !important;
}

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

/* --- Skip Link --- */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 50;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-md);
}

/* --- Typography --- */

h1 {
  font-family: var(--font-scripture);
  font-size: clamp(1.875rem, 1.5rem + 1.5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

.subtitle {
  font-family: var(--font-ui);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
  transition: font-size var(--transition-smooth), margin var(--transition-smooth);
}

.description {
  font-family: var(--font-ui);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: var(--line-height-base);
  color: var(--color-text);
  margin-top: var(--space-xs);
  margin-bottom: var(--space-md);
  max-height: 8em;
  opacity: 1;
  overflow: hidden;
}

/* --- Home Link --- */

.home-link {
  color: inherit;
  text-decoration: none;
  pointer-events: none;
}

.results-active .home-link {
  pointer-events: auto;
  cursor: pointer;
}

/* --- Page Header --- */

.page-header {
  text-align: left;
  padding: var(--space-xl) 0 var(--space-sm);
  width: 100%;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.verse-ref-header {
  font-family: var(--font-scripture);
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-top: 0;
  margin-bottom: var(--space-lg);
  max-height: 3em;
  overflow: hidden;
}

/* --- Animating State (JS-driven rAF) --- */

.animating .description,
.animating .verse-ref-header,
.animating .page-header {
  transition: none !important;
}

.animating .hero-section::before,
.animating .hero-section::after {
  transition: none !important;
  flex-grow: 0 !important;
}

/* --- Results-Active State (final docked position) --- */

.results-active .description {
  opacity: 0;
  max-height: 0;
  margin-top: 0;
  margin-bottom: 0;
}

.results-active .verse-ref-header {
  opacity: 0;
  max-height: 0;
  margin-bottom: 0;
  overflow: hidden;
}

.results-active .hero-section {
  max-height: 100vh;
  max-height: 100dvh;
  padding-bottom: calc(var(--space-lg) + 20px);
}

.results-active .hero-section::before,
.results-active .hero-section::after {
  flex-grow: 0;
}

.results-active main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.results-active #results-container {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}

.results-active .page-header {
  padding: var(--space-sm) 0 var(--space-sm);
}

.results-active .subtitle {
  font-size: 1rem;
}

/* --- Search Form --- */

.search-bar {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin: 0 auto var(--space-lg);
  transition: max-width var(--transition-smooth);
}

.search-input {
  width: 100%;
  font-family: var(--font-ui);
  font-size: var(--font-size-base);
  line-height: 1.4;
  padding: var(--space-sm) 3.5rem var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-quick), opacity var(--transition-quick);
  -webkit-appearance: none;
  appearance: none;
}

.search-input[aria-busy="true"] {
  opacity: 0.7;
  cursor: wait;
}

.search-input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
  display: none;
}

.search-input:focus-visible {
  border-color: var(--color-border);
  box-shadow: none;
  outline: 2px solid transparent;
  outline-offset: var(--focus-offset);
}

.search-input::placeholder {
  color: var(--color-text-muted);
  font-style: italic;
}

.clear-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target-desktop);
  height: var(--touch-target-desktop);
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  right: var(--space-sm);
  color: var(--color-text-muted);
}

/* --- Results Fade-In --- */

.results-content {
  opacity: 0;
  transition: opacity 170ms ease-in;
}

.results-content.visible {
  opacity: 1;
}

/* --- Carousel --- */

.carousel-viewport {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  touch-action: pan-y pinch-zoom;
  overscroll-behavior-x: contain;
}

.carousel-track {
  display: flex;
}

.carousel-slide {
  flex: 0 0 100%;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-slide--spacer {
  pointer-events: none;
}

/* --- Carousel Navigation --- */

.carousel-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: calc(var(--card-width) + 280px);
  margin-left: auto;
  margin-right: auto;
}

.carousel-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target-desktop);
  height: var(--touch-target-desktop);
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-accent);
  cursor: pointer;
}

.carousel-arrow:hover {
  background: var(--color-highlight);
}

.carousel-arrow[aria-disabled="true"] {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
}

.carousel-dot {
  width: 12px;
  height: 12px;
  padding: 0;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition: background-color var(--transition-quick);
}

.carousel-dot.active {
  background: var(--color-accent);
}

/* --- Result Card Placeholder (after clear) --- */

.result-card--placeholder {
  opacity: 0;
}

/* --- Result Cards --- */

.result-card {
  background-color: var(--color-bg-card);
  color: var(--color-text-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(156, 122, 90, 0.15);
  box-shadow: 0 2px 8px rgba(58, 53, 48, 0.06);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  max-width: var(--card-width);
  margin-left: auto;
  margin-right: auto;
  contain: content;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  line-height: 1.3;
}

.card-header strong {
  font-weight: 700;
}

/* --- Score Badges --- */

.score-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.2;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-lg);
  color: var(--color-text-inverse);
  white-space: nowrap;
}

.score-high {
  background-color: var(--color-score-high);
}

.score-mid {
  background-color: var(--color-score-mid);
}

.score-low {
  background-color: var(--color-score-low);
}

.score-minimal {
  background-color: var(--color-score-minimal);
  color: var(--color-text-card);
}

/* --- Context Verses --- */

.context-block {
  padding: var(--space-sm) 0;
}

.context-verse {
  padding: 0.3rem var(--space-sm);
  margin: 0.2rem 0;
  font-family: var(--font-scripture);
  font-size: 0.95rem;
  line-height: var(--line-height-scripture);
  color: #847d74;
}

.verse-ref {
  font-weight: bold;
  margin-right: var(--space-sm);
  font-size: 0.85rem;
}

.matched-verse {
  background: var(--color-highlight);
  border-left: 3px solid var(--color-accent);
  padding-left: 0.7rem;
  color: var(--color-text-card);
}

/* --- Header Actions / Feedback --- */

.card-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.feedback-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.feedback-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  opacity: 0.5;
  transition: color var(--transition-quick),
              background-color var(--transition-quick),
              opacity var(--transition-quick);
}

.feedback-btn:hover {
  background: var(--color-highlight);
  opacity: 1;
}

.feedback-up[aria-pressed="true"] {
  color: var(--color-score-high);
  opacity: 1;
}

.feedback-down[aria-pressed="true"] {
  color: var(--color-feedback-error);
  opacity: 1;
}

/* --- Status Messages --- */

.status-message {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  color: var(--color-text);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.status-message p {
  margin-bottom: var(--space-sm);
}

.loading-spinner {
  width: 28px;
  height: 28px;
  margin: var(--space-md) auto 0;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-message {
  color: var(--color-feedback-error);
}

.retry-button {
  display: inline-block;
  min-width: 120px;
  min-height: var(--touch-target-mobile);
  padding: var(--space-sm) var(--space-md);
  margin-top: var(--space-md);
  font-family: var(--font-ui);
  font-size: var(--font-size-base);
  color: var(--color-text-inverse);
  background-color: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.retry-button:hover {
  opacity: 0.9;
}

/* --- Sidebar --- */

.sidebar-toggle {
  position: fixed;
  top: calc(var(--space-md) + env(safe-area-inset-top, 0px));
  left: calc(var(--space-md) + env(safe-area-inset-left, 0px));
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target-mobile);
  height: var(--touch-target-mobile);
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  transition: opacity 300ms ease-out;
}

.sidebar-toggle:hover {
  background: var(--color-highlight);
}

.sidebar-open .sidebar-toggle {
  background: var(--color-sidebar-bg);
}

.sidebar-open .sidebar-toggle:hover {
  background: var(--color-sidebar-bg);
}

.history-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  width: var(--sidebar-width);
  height: 100vh;
  height: 100dvh;
  height: 100svh;
  padding: calc(var(--touch-target-mobile) + var(--space-lg)) var(--space-md) var(--space-md);
  padding-bottom: calc(var(--space-md) + env(safe-area-inset-bottom, 0px));
  padding-left: calc(var(--space-md) + env(safe-area-inset-left, 0px));
  background-color: var(--color-sidebar-bg);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-y: contain;
  transform: translateX(-100%);
  transition: transform 300ms ease-out;
  will-change: transform;
  display: flex;
  flex-direction: column;
}

.sidebar-open .history-sidebar {
  transform: translateX(0);
}

.sidebar-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: rgba(0, 0, 0, 0.3);
}

.sidebar-title {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.history-empty {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: left;
  padding: var(--space-md) 0;
}

.history-list:not(:empty) + .history-empty {
  display: none;
}

.sidebar-version {
  margin-top: auto;
  padding-top: var(--space-md);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  opacity: 0.6;
}

.history-entry {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.history-query {
  flex: 1;
  min-width: 0;
  padding: var(--space-xs) 0;
  border: none;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-query:hover {
  color: var(--color-accent);
}

.history-delete {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  cursor: pointer;
}

.history-delete:hover {
  color: var(--color-feedback-error);
}

/* --- Offline Banner --- */

.offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  width: 100%;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding-top: env(safe-area-inset-top, 0px);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--color-text);
  background: rgba(153, 153, 153, 0.1);
  border-bottom: 1px solid var(--color-border);
}

.offline-banner.hidden {
  display: none !important;
}

/* --- Focus Indicators --- */

a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: var(--focus-offset);
}

/* --- SEO Content Section --- */

.seo-content {
  width: 100%;
  max-width: var(--max-width);
  margin: var(--space-xl) auto 0;
  padding: var(--space-xl) var(--space-md);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
}

.seo-content-inner {
  max-width: 640px;
  margin: 0 auto;
}

.seo-heading {
  font-family: var(--font-scripture);
  font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.seo-subheading {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.seo-description {
  font-family: var(--font-ui);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.example-queries {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.example-query {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target-desktop);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-accent);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color var(--transition-quick),
              border-color var(--transition-quick);
}

.example-query:hover {
  background: var(--color-highlight);
  border-color: var(--color-accent);
}

/* --- GitHub Link --- */

.github-link {
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.github-link a {
  color: var(--color-accent);
  text-decoration: none;
}

.github-link a:hover {
  text-decoration: underline;
}

/* --- Support Section --- */

.support-section {
  width: 100%;
  max-width: var(--max-width);
  margin: var(--space-lg) auto var(--space-xl);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}

.support-section .github-link {
  margin-bottom: var(--space-md);
}

.support-links {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.support-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: opacity var(--transition-quick);
}

.support-link:hover {
  opacity: 0.85;
}

.support-link--github {
  color: var(--color-text-inverse);
  background-color: #333;
}

.support-link--kofi {
  color: var(--color-text-inverse);
  background-color: #e05d6f;
}

/* --- Reduced Motion --- */

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

/* --- Responsive: Mobile (up to 767px) --- */

@media (max-width: 767px) {
  .sidebar-toggle {
    position: relative;
    top: auto;
    left: auto;
  }

  .results-active .page-header {
    padding-top: var(--space-sm);
  }

  .clear-button {
    width: var(--touch-target-mobile);
    height: var(--touch-target-mobile);
  }

  .search-input {
    padding-right: calc(var(--touch-target-mobile) + var(--space-sm) * 2);
  }

  .carousel-arrow {
    width: var(--touch-target-mobile);
    height: var(--touch-target-mobile);
  }

  .history-delete {
    width: var(--touch-target-mobile);
    height: var(--touch-target-mobile);
  }

  .feedback-btn {
    width: 32px;
    height: 32px;
  }

  .example-query {
    min-height: var(--touch-target-mobile);
  }

}

/* --- Responsive: Tablet (768px+) --- */

@media (min-width: 768px) {
  .sidebar-backdrop {
    display: none !important;
  }

  .search-input {
    font-size: 1.1rem;
  }

  .carousel-wrapper {
    max-width: calc(var(--card-width) + 320px);
  }
}

/* --- Responsive: Desktop (1024px+) --- */

@media (min-width: 1024px) {
  .search-bar {
    max-width: 640px;
  }

  .page-header {
    max-width: 640px;
  }

  .carousel-wrapper {
    max-width: calc(var(--card-width) + 380px);
  }

  .seo-content-inner {
    max-width: 700px;
  }
}

/* --- Responsive: Wide (1280px+) --- */

@media (min-width: 1280px) {
  :root {
    --max-width: 1100px;
  }

  .search-bar {
    max-width: 700px;
  }

  .page-header {
    max-width: 700px;
  }

  .result-card {
    max-width: 540px;
  }
}