/* ============================================================
   INTRO / LANDING SCREEN - Native-feel pager (full-viewport pages)
   ============================================================ */

.intro-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--bg-void);
  color: var(--text-primary);
  overflow: hidden;
}

/* Starfield behind everything. Warp-in entrance: the field rushes past and
   settles (display:none -> shown restarts animations, so it replays). */
.intro-screen .intro-starfield {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  animation: intro-warp-in 1.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes intro-warp-in {
  0%   { transform: scale(4.5); opacity: 0; filter: blur(3px); }
  30%  { opacity: 1; }
  100% { transform: scale(1); opacity: 1; filter: blur(0); }
}

.intro-star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  animation: intro-twinkle var(--dur, 3s) infinite alternate;
  opacity: var(--op, 0.4);
}

.intro-star.bright {
  width: 3px;
  height: 3px;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.5);
}

@keyframes intro-twinkle {
  from { opacity: 0.15; }
  to { opacity: var(--op, 0.7); }
}

/* Pager content container */
.intro-content {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100dvh;
}

/* Language switcher on intro */
.intro-screen .lang-switcher-intro {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: 16px;
  z-index: 1003;
  display: flex;
  gap: 8px;
}

.intro-screen .lang-switcher-intro a {
  font-size: 1.4rem;
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.intro-screen .lang-switcher-intro a:hover {
  opacity: 1;
}

/* Pager pages - absolutely positioned, fade in/out */
.intro-section {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100dvh;
  padding: max(56px, calc(env(safe-area-inset-top, 0px) + 40px)) 24px calc(96px + env(safe-area-inset-bottom, 0px));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

.intro-section.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* ─── HERO PAGE ─── */
.intro-hero {
  justify-content: flex-start;
  text-align: center;
}

.intro-hero .intro-logo {
  width: min(420px, 80vw);
  height: auto;
  margin-top: auto;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 40px rgba(var(--accent-rgb), 0.5));
  animation: intro-logo-in 1.1s cubic-bezier(0.16, 1, 0.3, 1) both,
             intro-logo-glow 4s ease-in-out 2.5s infinite;
}

@keyframes intro-logo-in {
  0% {
    opacity: 0;
    transform: scale(1.2) translateY(14px);
    filter: blur(12px) drop-shadow(0 0 70px rgba(var(--accent-rgb), 0.8));
  }
  100% {
    opacity: 1;
    transform: none;
    filter: blur(0) drop-shadow(0 0 40px rgba(var(--accent-rgb), 0.5));
  }
}

@keyframes intro-logo-glow {
  0%, 100% { filter: drop-shadow(0 0 40px rgba(var(--accent-rgb), 0.5)); }
  50% { filter: drop-shadow(0 0 70px rgba(var(--accent-rgb), 0.75)); }
}

.intro-hero .intro-tagline {
  font-family: var(--font-display);
  font-size: clamp(0.65rem, 1.8vw, 0.9rem);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin: 8px 0 24px;
  text-shadow: 0 0 20px rgba(var(--accent-rgb), 0.3);
  animation: intro-tagline-in 1.4s ease-out 0.45s both;
}

@keyframes intro-tagline-in {
  0%   { opacity: 0; letter-spacing: 0.85em; }
  100% { opacity: 1; letter-spacing: 0.4em; }
}

.intro-hero .intro-premise {
  font-size: clamp(0.95rem, 2.5vw, 1.2rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 0 20px;
  animation: intro-fade-up 1s ease-out 0.9s both;
}

@keyframes intro-fade-up {
  0%   { opacity: 0; transform: translateY(16px); }
  100% { opacity: 1; transform: none; }
}

.intro-hero .intro-premise em {
  color: var(--cyan);
  font-style: normal;
  text-shadow: 0 0 12px rgba(var(--accent-rgb), 0.4);
}

.intro-hero-image {
  width: min(800px, 88vw);
  height: auto;
  margin-top: auto;
  margin-bottom: 4px;
  animation: intro-fade-up 1.2s ease-out 1.15s both,
             intro-kenburns 20s ease-in-out 2.4s infinite alternate;
  mask-image:
    linear-gradient(to right, transparent, black 12%, black 88%, transparent),
    linear-gradient(to bottom, transparent, black 10%, black 85%, transparent);
  mask-composite: intersect;
  -webkit-mask-image:
    linear-gradient(to right, transparent, black 12%, black 88%, transparent),
    linear-gradient(to bottom, transparent, black 10%, black 85%, transparent);
  -webkit-mask-composite: source-in;
}

/* ─── NARRATIVE PAGE ─── */
.intro-narrative {
  justify-content: center;
  text-align: center;
}

.intro-narrative .intro-section-label,
.intro-how .intro-section-label,
.intro-compare .intro-section-label {
  font-family: var(--font-display);
  font-size: 0.65rem;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 20px;
  text-shadow: 0 0 10px rgba(var(--accent-rgb), 0.3);
}

.intro-narrative h2,
.intro-how h2,
.intro-compare h2 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.6vw, 1.9rem);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 28px;
  line-height: 1.35;
  text-shadow: 0 0 30px rgba(var(--accent-rgb), 0.2);
  max-width: 800px;
}

.intro-narrative p {
  font-size: clamp(0.9rem, 2.2vw, 1.05rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 16px;
}

.intro-narrative p strong {
  color: var(--cyan);
  font-weight: 600;
}

/* ─── HOW IT WORKS PAGE ─── */
.intro-how {
  justify-content: center;
  text-align: center;
}

.intro-paths {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

.intro-path-card {
  background: rgba(var(--accent-rgb), 0.04);
  border: 1px solid rgba(var(--accent-rgb), 0.15);
  border-radius: 4px;
  padding: 24px 20px;
  text-align: center;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.intro-path-card:hover {
  border-color: rgba(var(--accent-rgb), 0.35);
  box-shadow: 0 0 30px rgba(var(--accent-rgb), 0.08);
}

.intro-path-icon {
  font-size: 2.5rem;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  background: radial-gradient(circle at 30% 30%, rgba(var(--accent-rgb), 0.14), rgba(var(--accent-rgb), 0.04) 60%, transparent 80%);
  box-shadow: 0 0 24px rgba(var(--accent-rgb), 0.15), inset 0 0 12px rgba(var(--accent-rgb), 0.08);
  color: var(--cyan);
  transition: box-shadow 0.3s, transform 0.3s;
}

.intro-path-icon svg {
  width: 60%;
  height: 60%;
  display: block;
  filter: drop-shadow(0 0 6px rgba(var(--accent-rgb), 0.35));
}

.intro-path-icon--human {
  color: var(--amber);
  border-color: rgba(245, 158, 11, 0.3);
  background: radial-gradient(circle at 30% 30%, rgba(245, 158, 11, 0.18), rgba(245, 158, 11, 0.05) 60%, transparent 80%);
  box-shadow: 0 0 24px rgba(245, 158, 11, 0.18), inset 0 0 12px rgba(245, 158, 11, 0.1);
}

.intro-path-icon--human svg {
  filter: drop-shadow(0 0 6px rgba(245, 158, 11, 0.4));
}

.intro-path-card:hover .intro-path-icon {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(var(--accent-rgb), 0.25), inset 0 0 16px rgba(var(--accent-rgb), 0.1);
}

.intro-path-card:hover .intro-path-icon--human {
  box-shadow: 0 0 36px rgba(245, 158, 11, 0.3), inset 0 0 16px rgba(245, 158, 11, 0.12);
}

.intro-path-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 10px;
}

.intro-path-card p {
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0;
}

.intro-path-card code {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 10px;
  background: rgba(var(--accent-rgb), 0.1);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
}

/* ─── LIVE STATS ─── */
.intro-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 32px;
}

.intro-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.intro-stat-value {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2rem);
  font-weight: 700;
  color: var(--cyan);
  text-shadow: 0 0 16px rgba(var(--accent-rgb), 0.4);
}

.intro-stat-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-top: 4px;
  letter-spacing: 0.05em;
}

/* ─── COMPARISON PAGE ─── */
.intro-compare {
  justify-content: center;
  text-align: center;
}

.intro-compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}

.intro-compare-col {
  text-align: left;
}

.intro-compare-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.15);
}

.intro-compare-header .compare-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  background: radial-gradient(circle at 30% 30%, rgba(var(--accent-rgb), 0.12), transparent 75%);
  color: var(--cyan);
}

.intro-compare-header .compare-icon svg {
  width: 70%;
  height: 70%;
  display: block;
  filter: drop-shadow(0 0 4px rgba(var(--accent-rgb), 0.35));
}

.intro-compare-col.humans .intro-compare-header .compare-icon {
  color: var(--amber);
  border-color: rgba(245, 158, 11, 0.3);
  background: radial-gradient(circle at 30% 30%, rgba(245, 158, 11, 0.15), transparent 75%);
}

.intro-compare-col.humans .intro-compare-header .compare-icon svg {
  filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.4));
}

.intro-compare-header h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.intro-compare-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.intro-compare-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--text-secondary);
}

.intro-compare-list .compare-bullet {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.85rem;
}

.intro-compare-list .compare-bullet svg {
  width: 15px;
  height: 15px;
  display: block;
}

.intro-compare-col.humans .compare-bullet {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--amber);
}

.intro-compare-col.agents .compare-bullet {
  background: rgba(var(--accent-rgb), 0.1);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  color: var(--cyan);
}

.intro-compare-list .compare-text strong {
  display: block;
  color: var(--text-primary);
  font-size: 0.82rem;
  margin-bottom: 2px;
}

.intro-compare-list .compare-text span {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ─── CTA PAGE ─── */
.intro-cta {
  justify-content: center;
  text-align: center;
}

.intro-cta p {
  font-size: clamp(0.95rem, 2.4vw, 1.15rem);
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 0 32px;
}

.intro-cta p strong {
  color: var(--cyan);
}

.intro-play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 56px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bg-void);
  background: var(--cyan);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.3s;
  box-shadow:
    0 0 40px rgba(var(--accent-rgb), 0.4),
    0 0 80px rgba(var(--accent-rgb), 0.15);
}

.intro-play-btn:hover {
  transform: scale(1.04);
  box-shadow:
    0 0 60px rgba(var(--accent-rgb), 0.6),
    0 0 120px rgba(var(--accent-rgb), 0.2);
}

.intro-play-btn:active {
  transform: scale(0.98);
}

.intro-play-btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  animation: intro-btn-shine 3s ease-in-out infinite;
}

@keyframes intro-btn-shine {
  0%, 70%, 100% { left: -100%; }
  40% { left: 100%; }
}

.intro-api-note {
  margin-top: 18px;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.intro-api-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.3);
  transition: border-color 0.2s;
}

.intro-api-note a:hover {
  border-color: var(--cyan);
}

/* ─── PAGER CONTROLS ─── */
.intro-pager {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 20px);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 14px;
  z-index: 1002;
  background: rgba(6, 6, 15, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  border-radius: 999px;
  padding: 8px 14px;
}

.intro-pager-btn {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 999px;
  transition: opacity 0.15s, background 0.15s, color 0.15s;
  line-height: 1;
  min-width: 28px;
}

.intro-pager-btn:hover {
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--cyan);
}

.intro-pager-btn:disabled,
.intro-pager-btn[disabled] {
  opacity: 0.25;
  cursor: default;
  background: none;
  color: var(--text-primary);
}

.intro-pager-btn.is-final {
  background: var(--cyan);
  color: var(--bg-void);
  padding: 6px 16px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 999px;
  min-width: 0;
  box-shadow: 0 0 20px rgba(var(--accent-rgb), 0.35);
}

.intro-pager-btn.is-final:hover {
  background: var(--cyan);
  color: var(--bg-void);
  filter: brightness(1.1);
  box-shadow: 0 0 28px rgba(var(--accent-rgb), 0.55);
}

.intro-pager-dots {
  display: flex;
  gap: 6px;
  align-items: center;
}

.intro-pager-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background 0.2s, transform 0.2s;
}

.intro-pager-dot:hover {
  background: rgba(255, 255, 255, 0.45);
}

.intro-pager-dot.is-active {
  background: var(--cyan);
  transform: scale(1.35);
  box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.5);
}

/* ─── Transition animation ─── */
.intro-screen.intro-exit {
  animation: intro-exit 0.6s ease-in forwards;
}

@keyframes intro-exit {
  0% { opacity: 1; }
  100% { opacity: 0; pointer-events: none; }
}

/* ─── MOBILE ─── */
@media (max-width: 680px) {
  .intro-section {
    padding-left: 16px;
    padding-right: 16px;
    padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
  }

  .intro-hero .intro-logo {
    width: min(280px, 68vw);
  }

  .intro-hero .intro-premise {
    font-size: 0.95rem;
    padding: 0 8px;
  }

  .intro-stats {
    gap: 22px;
  }

  .intro-paths {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .intro-compare-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .intro-play-btn {
    padding: 14px 44px;
    font-size: 1.05rem;
  }

  .intro-pager {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 14px);
    gap: 10px;
    padding: 6px 12px;
  }

  .intro-pager-btn.is-final {
    font-size: 0.75rem;
    padding: 5px 12px;
  }
}

@media (max-width: 400px) {
  .intro-hero .intro-tagline {
    letter-spacing: 0.2em;
    font-size: 0.6rem;
  }

  .intro-path-card {
    padding: 18px 14px;
  }

  .intro-compare-list li {
    font-size: 0.8rem;
  }
}


@keyframes intro-kenburns {
  0%   { transform: scale(1); }
  100% { transform: scale(1.05) translateY(-5px); }
}

/* Accessibility: no cinematics for users who ask for less motion */
@media (prefers-reduced-motion: reduce) {
  .intro-screen .intro-starfield,
  .intro-hero .intro-logo,
  .intro-hero .intro-tagline,
  .intro-hero .intro-premise,
  .intro-hero-image {
    animation: none;
  }
}