/**
 * Landing Page (Homepage) Styles
 *
 * All values reference CSS custom properties from design-tokens.css (--tga-*).
 */

/* ================================================================== */
/*  Hero Section                                                       */
/* ================================================================== */
.tga-landing-hero {
  position: relative;
  overflow: hidden;
  padding: var(--tga-space-16) var(--tga-space-4);
  margin-bottom: var(--tga-space-16);
}

.tga-landing-hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--tga-primary-dark) 0%, var(--tga-primary) 40%, #1976D2 100%);
  z-index: 0;
}

/* Subtle grid pattern overlay */
.tga-landing-hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, var(--tga-overlay-lighter) 1px, transparent 0);
  background-size: 40px 40px;
}

/* Glow accent */
.tga-landing-hero__bg::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
}

.tga-landing-hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--tga-content-max);
  margin: 0 auto;
  text-align: center;
}

.tga-landing-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--tga-space-2);
  padding: var(--tga-space-2) var(--tga-space-4);
  background: var(--tga-overlay-light);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--tga-radius-full);
  font-size: var(--tga-text-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  margin-bottom: var(--tga-space-8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.tga-landing-hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--tga-white);
  margin: 0 0 var(--tga-space-6);
  letter-spacing: -0.02em;
}

.tga-landing-hero__subtitle {
  font-size: var(--tga-text-lg);
  line-height: var(--tga-line-height-relaxed);
  color: rgba(255,255,255,0.8);
  margin: 0 auto var(--tga-space-10);
  max-width: 600px;
}

.tga-landing-hero__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--tga-space-4);
}

.tga-landing-hero__btn-primary {
  background: var(--tga-white);
  color: var(--tga-primary);
  border-color: var(--tga-white);
  font-weight: 700;
}

.tga-landing-hero__btn-primary:hover {
  background: rgba(255,255,255,0.9);
  color: var(--tga-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.tga-landing-hero__btn-secondary {
  background: transparent;
  color: var(--tga-white);
  border-color: rgba(255,255,255,0.4);
}

.tga-landing-hero__btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.7);
  color: var(--tga-white);
}

/* ================================================================== */
/*  Section Headers                                                    */
/* ================================================================== */
.tga-landing-section {
  margin-bottom: var(--tga-space-16);
}

.tga-landing-section__header {
  text-align: center;
  margin-bottom: var(--tga-space-10);
}

.tga-landing-section__title {
  font-size: var(--tga-text-3xl);
  font-weight: 800;
  color: var(--tga-neutral-900);
  margin: 0 0 var(--tga-space-3);
  letter-spacing: -0.01em;
}

.tga-landing-section__desc {
  font-size: var(--tga-text-lg);
  color: var(--tga-neutral-600);
  margin: 0;
  max-width: 500px;
  margin-inline: auto;
}

/* ================================================================== */
/*  Scroll Track Cards — Ancient Parchment Style                       */
/* ================================================================== */
.tga-scroll-tracks {
  display: flex;
  gap: var(--tga-space-6);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding: var(--tga-space-4);
  padding-bottom: var(--tga-space-4);
  -webkit-overflow-scrolling: touch;
}

/* Hide scrollbar but keep functionality */
.tga-scroll-tracks::-webkit-scrollbar { height: 6px; }
.tga-scroll-tracks::-webkit-scrollbar-track { background: transparent; }
.tga-scroll-tracks::-webkit-scrollbar-thumb { background: var(--tga-neutral-300); border-radius: 3px; }
.tga-scroll-tracks::-webkit-scrollbar-thumb:hover { background: var(--tga-neutral-400); }

.tga-scroll-card {
  flex: 0 0 320px;
  scroll-snap-align: start;
  position: relative;
  padding: var(--tga-space-8) var(--tga-space-6);
  display: flex;
  flex-direction: column;

  /* Clean parchment background */
  background: var(--tga-parchment-bg);
  border: 1px solid var(--tga-parchment-border);
  border-left: 4px solid var(--track-color, var(--tga-primary));
  border-radius: var(--tga-radius-lg);

  box-shadow: var(--tga-shadow-soft);
  transition: transform var(--tga-transition-base), box-shadow var(--tga-transition-base);
}

.tga-scroll-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--tga-shadow-hover);
}

/* Seal / stamp accent */
.tga-scroll-card__seal {
  position: absolute;
  top: var(--tga-space-4);
  right: var(--tga-space-4);
  width: 36px;
  height: 36px;
  border-radius: var(--tga-radius-full);
  background: var(--track-color, var(--tga-primary));
  opacity: 0.25;
}

.tga-scroll-card__header {
  display: flex;
  align-items: center;
  gap: var(--tga-space-3);
  margin-bottom: var(--tga-space-4);
}

.tga-scroll-card__name {
  font-size: var(--tga-text-xl);
  font-weight: 800;
  color: var(--track-color, var(--tga-primary));
  margin: 0;
  letter-spacing: 0.01em;
}

/* 【】brackets decoration via pseudo-elements */
.tga-scroll-card__name::before { content: '【'; color: var(--tga-neutral-400); font-weight: 300; }
.tga-scroll-card__name::after { content: '】'; color: var(--tga-neutral-400); font-weight: 300; }

.tga-scroll-card__desc {
  font-size: var(--tga-text-sm);
  line-height: var(--tga-line-height-relaxed);
  color: var(--tga-parchment-text);
  flex-grow: 1;
  margin: 0 0 var(--tga-space-4);
}

.tga-scroll-card__stats {
  display: flex;
  align-items: center;
  gap: var(--tga-space-3);
  font-size: var(--tga-text-sm);
  font-weight: 600;
  color: var(--tga-parchment-accent);
  margin-bottom: var(--tga-space-5);
}

.tga-scroll-card__stats small {
  font-weight: 400;
  font-size: var(--tga-text-xs);
  color: var(--tga-parchment-muted);
}

.tga-scroll-card__stats-sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--tga-parchment-border);
}

.tga-scroll-card__action { margin-top: auto; }

.tga-scroll-card__action .tga-btn--primary {
  background: var(--track-color, var(--tga-primary));
  border-color: var(--track-color, var(--tga-primary));
  color: var(--tga-white);
}

.tga-scroll-card__action .tga-btn--primary:hover {
  filter: brightness(1.1);
}

/* Dot indicators */
.tga-scroll-dots {
  display: flex;
  justify-content: center;
  gap: var(--tga-space-2);
  margin-top: var(--tga-space-5);
}

.tga-scroll-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--tga-radius-full);
  border: 2px solid var(--tga-neutral-400);
  background: transparent;
  padding: 0;
  cursor: pointer;
  transition: all var(--tga-transition-fast);
}

.tga-scroll-dot.active {
  background: var(--tga-primary);
  border-color: var(--tga-primary);
  transform: scale(1.2);
}

.tga-scroll-dot:hover { border-color: var(--tga-primary); }

/* Mobile: stack vertically, hide dots */
@media (max-width: 768px) {
  .tga-scroll-tracks {
    flex-direction: column;
    overflow-x: visible;
    scroll-snap-type: none;
  }
  .tga-scroll-card {
    flex: none;
    width: 100%;
  }
  .tga-scroll-dots { display: none; }
}

/* ================================================================== */
/*  Scroll Cards — Dark mode                                           */
/* ================================================================== */
[data-theme="dark"] .tga-scroll-card {
  background: var(--tga-parchment-bg);
  border-color: var(--tga-parchment-border);
  border-left: 4px solid var(--track-color, var(--tga-primary));
  box-shadow: var(--tga-shadow-soft);
}

[data-theme="dark"] .tga-scroll-card:hover {
  box-shadow: var(--tga-shadow-hover);
}

[data-theme="dark"] .tga-scroll-card__name::before,
[data-theme="dark"] .tga-scroll-card__name::after { color: var(--tga-neutral-600); }

[data-theme="dark"] .tga-scroll-card__desc { color: var(--tga-parchment-text); }
[data-theme="dark"] .tga-scroll-card__stats { color: var(--tga-parchment-accent); }
[data-theme="dark"] .tga-scroll-card__stats small { color: var(--tga-parchment-muted); }
[data-theme="dark"] .tga-scroll-card__stats-sep { background: var(--tga-parchment-border); }
[data-theme="dark"] .tga-scroll-dot { border-color: var(--tga-neutral-600); }
[data-theme="dark"] .tga-scroll-dot.active { background: var(--tga-primary); border-color: var(--tga-primary); }

/* ================================================================== */
/*  How It Works - Steps                                               */
/* ================================================================== */
.tga-landing-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--tga-space-6);
  position: relative;
}

/* Connecting line behind steps */
.tga-landing-steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: calc(12.5% + 24px);
  right: calc(12.5% + 24px);
  height: 2px;
  background: var(--tga-neutral-200);
  z-index: 0;
}

.tga-landing-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.tga-landing-step__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--tga-radius-lg);
  background: var(--tga-primary);
  color: var(--tga-white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--tga-space-4);
  border: 2px solid var(--tga-white);
  box-shadow: var(--tga-shadow-md);
}

.tga-landing-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--tga-radius-full);
  background: var(--tga-primary);
  color: var(--tga-white);
  font-size: var(--tga-text-xs);
  font-weight: 700;
  margin-bottom: var(--tga-space-3);
}

.tga-landing-step__title {
  font-size: var(--tga-text-base);
  font-weight: 700;
  color: var(--tga-neutral-900);
  margin: 0 0 var(--tga-space-2);
}

.tga-landing-step__desc {
  font-size: var(--tga-text-sm);
  color: var(--tga-neutral-600);
  margin: 0;
  line-height: var(--tga-line-height-relaxed);
}

@media (max-width: 768px) {
  .tga-landing-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--tga-space-8);
  }

  .tga-landing-steps::before {
    display: none;
  }
}

@media (max-width: 480px) {
  .tga-landing-steps {
    grid-template-columns: 1fr;
  }
}

/* ================================================================== */
/*  Features                                                           */
/* ================================================================== */
.tga-landing-feature {
  text-align: center;
  padding: var(--tga-space-8) var(--tga-space-6);
  transition: border-color var(--tga-transition-base),
              box-shadow var(--tga-transition-base);
}

.tga-landing-feature:hover {
  border-color: var(--tga-primary-light);
  box-shadow: var(--tga-shadow-md);
}

.tga-landing-feature__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--tga-radius-md);
  background: var(--tga-primary-light);
  color: var(--tga-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--tga-space-4);
}

.tga-landing-feature__title {
  font-size: var(--tga-text-base);
  font-weight: 700;
  color: var(--tga-neutral-900);
  margin: 0 0 var(--tga-space-2);
}

.tga-landing-feature__desc {
  font-size: var(--tga-text-sm);
  color: var(--tga-neutral-600);
  margin: 0;
  line-height: var(--tga-line-height-relaxed);
}

/* ================================================================== */
/*  Stats Bar                                                          */
/* ================================================================== */
.tga-landing-stats {
  display: flex;
  justify-content: center;
  gap: var(--tga-space-16);
  padding: var(--tga-space-12) var(--tga-space-4);
  margin-bottom: var(--tga-space-12);
  border-top: 1px solid var(--tga-neutral-200);
  border-bottom: 1px solid var(--tga-neutral-200);
  flex-wrap: wrap;
}

.tga-landing-stat {
  text-align: center;
}

.tga-landing-stat__value {
  font-size: var(--tga-text-4xl);
  font-weight: 800;
  color: var(--tga-primary);
  line-height: 1;
  margin-bottom: var(--tga-space-2);
  letter-spacing: -0.02em;
}

.tga-landing-stat__label {
  font-size: var(--tga-text-sm);
  color: var(--tga-neutral-600);
  font-weight: 500;
}

@media (max-width: 640px) {
  .tga-landing-stats {
    gap: var(--tga-space-8);
  }
}

/* ================================================================== */
/*  Bottom CTA                                                         */
/* ================================================================== */
.tga-landing-cta {
  text-align: center;
  padding: var(--tga-space-16) var(--tga-space-4);
  background: var(--tga-neutral-50);
  border-radius: var(--tga-radius-xl);
  margin-bottom: var(--tga-space-16);
}

.tga-landing-cta__title {
  font-size: var(--tga-text-3xl);
  font-weight: 800;
  color: var(--tga-neutral-900);
  margin: 0 0 var(--tga-space-4);
}

.tga-landing-cta__desc {
  font-size: var(--tga-text-lg);
  color: var(--tga-neutral-600);
  margin: 0 0 var(--tga-space-8);
}

/* ================================================================== */
/*  Dark mode overrides                                                */
/* ================================================================== */
[data-theme="dark"] .tga-landing-hero__bg {
  background: linear-gradient(135deg, #0a1929 0%, var(--tga-primary-dark) 50%, var(--tga-primary) 100%);
}

[data-theme="dark"] .tga-landing-section__title {
  color: var(--tga-neutral-100);
}

[data-theme="dark"] .tga-landing-feature {
  background: var(--tga-neutral-900);
  border-color: var(--tga-neutral-800);
}

[data-theme="dark"] .tga-landing-feature:hover {
  border-color: var(--tga-primary);
}

[data-theme="dark"] .tga-landing-feature__title {
  color: var(--tga-neutral-100);
}

[data-theme="dark"] .tga-landing-feature__desc {
  color: var(--tga-neutral-400);
}

[data-theme="dark"] .tga-landing-step__title {
  color: var(--tga-neutral-100);
}

[data-theme="dark"] .tga-landing-step__desc {
  color: var(--tga-neutral-400);
}

[data-theme="dark"] .tga-landing-stats {
  border-color: var(--tga-neutral-800);
}

[data-theme="dark"] .tga-landing-stat__label {
  color: var(--tga-neutral-400);
}

[data-theme="dark"] .tga-landing-cta {
  background: var(--tga-neutral-900);
}

[data-theme="dark"] .tga-landing-cta__title {
  color: var(--tga-neutral-100);
}

[data-theme="dark"] .tga-landing-cta__desc {
  color: var(--tga-neutral-400);
}