/* ==========================================================================
   Archaeoceti Custom Design System - Color Matched to Logo & App Assets
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Color Palette (Extracted & Matched to Logo & Apps)
   -------------------------------------------------------------------------- */
:root {
  /* Fonts */
  --font-sans: 'Outfit', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', 'Noto Sans TC', sans-serif;

  /* Color Extraction Keys:
   * Logo Coral Pink: #FF948A
   * Easy Math Lavender-Purple: #9181EC
   * Hanzi / Bpmf Rose Pink: #EE8FD3
   */

  /* Light Mode Palette - Friendly, Warm Educational Feel */
  --bg-primary: #fcf9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5eeef;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.82);

  --text-primary: #2d2433;
  --text-secondary: #5e5266;
  --text-muted: #8c7d94;
  --text-inverse: #ffffff;

  /* Brand Accents derived from Logo Coral Pink (#FF948A) & Easy Math Purple (#9181EC) */
  --accent-logo: #ff8c82;         /* Logo Warm Coral */
  --accent-easymath: #8f7fec;     /* Easy Math Lavender Purple */
  --accent-hanzi: #ed87cf;        /* Hanzi & BPMF Rose Pink */

  --accent-primary: #ff8c82;
  --accent-primary-hover: #ff7568;
  --accent-secondary: #8f7fec;

  --accent-gradient: linear-gradient(135deg, #ff8c82 0%, #ed87cf 50%, #8f7fec 100%);
  --accent-glow: rgba(255, 140, 130, 0.3);

  --border-color: rgba(235, 218, 224, 0.8);
  --border-focus: #ff8c82;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(45, 36, 51, 0.04);
  --shadow-md: 0 6px 16px rgba(45, 36, 51, 0.06);
  --shadow-lg: 0 12px 32px rgba(45, 36, 51, 0.08);
  --shadow-hover: 0 20px 36px rgba(255, 140, 130, 0.2);

  /* Layout & Spacing */
  --nav-height: 72px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-full: 9999px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Tokens - Deep Warm Midnight Atmosphere */
[data-theme="dark"] {
  --bg-primary: #15111e;
  --bg-secondary: #1d182b;
  --bg-tertiary: #28213b;
  --bg-card: rgba(29, 24, 43, 0.85);
  --bg-glass: rgba(29, 24, 43, 0.75);

  --text-primary: #f7f3fb;
  --text-secondary: #c2b7cd;
  --text-muted: #8b7e98;
  --text-inverse: #15111e;

  --accent-logo: #ff9d94;
  --accent-easymath: #9d8ff3;
  --accent-hanzi: #f197d8;

  --accent-primary: #ff9d94;
  --accent-primary-hover: #ffb1ab;
  --accent-secondary: #9d8ff3;

  --accent-gradient: linear-gradient(135deg, #ff9d94 0%, #f197d8 50%, #9d8ff3 100%);
  --accent-glow: rgba(255, 157, 148, 0.35);

  --border-color: rgba(255, 255, 255, 0.12);
  --border-focus: #ff9d94;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 20px 36px rgba(255, 157, 148, 0.25);
}

/* --------------------------------------------------------------------------
   2. Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Section Common */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-primary);
  background: rgba(255, 140, 130, 0.12);
  padding: 0.35rem 1.1rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  border: 1px solid var(--border-color);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   3. Background Decorative Effects (Coral & Lavender Glow)
   -------------------------------------------------------------------------- */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

.bg-glow-1 {
  width: 480px;
  height: 480px;
  background: var(--accent-logo);
  top: -120px;
  right: -100px;
  opacity: 0.18;
}

.bg-glow-2 {
  width: 520px;
  height: 520px;
  background: var(--accent-easymath);
  bottom: 8%;
  left: -160px;
  opacity: 0.16;
}

/* --------------------------------------------------------------------------
   4. Navigation Bar
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-logo img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.brand-title {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2.5px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Control Buttons (Theme, Lang) */
.btn-icon {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-1px);
}

.btn-lang {
  padding: 0 0.9rem;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.btn-lang:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: calc(var(--nav-height) + 4rem);
  padding-bottom: 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.35rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-logo);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px var(--accent-logo);
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero-title-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-slogan {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent-primary);
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
  font-style: italic;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 2.5rem auto;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Primary Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 2.2rem;
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-md), 0 4px 18px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 8px 28px var(--accent-glow);
}

/* Secondary Button */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 2.2rem;
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

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

/* --------------------------------------------------------------------------
   6. Apps Showcase Section - Color Matched Cards
   -------------------------------------------------------------------------- */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.25rem;
  position: relative;
  z-index: 1;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

/* Top Color Accent Line on each card */
.app-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}

#cardEasyMath::before {
  background: var(--accent-easymath);
}

#cardHanzi::before {
  background: var(--accent-hanzi);
}

#cardBpmf::before {
  background: var(--accent-logo);
}

.app-card:hover {
  transform: translateY(-8px);
}

#cardEasyMath:hover {
  box-shadow: 0 20px 36px rgba(143, 127, 236, 0.25);
  border-color: var(--accent-easymath);
}

#cardHanzi:hover {
  box-shadow: 0 20px 36px rgba(237, 135, 207, 0.25);
  border-color: var(--accent-hanzi);
}

#cardBpmf:hover {
  box-shadow: 0 20px 36px rgba(255, 140, 130, 0.25);
  border-color: var(--accent-logo);
}

.app-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.app-icon {
  width: 76px;
  height: 76px;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.app-title-wrap {
  flex-grow: 1;
}

.app-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.app-subtitle {
  font-size: 0.925rem;
  font-weight: 600;
}

#cardEasyMath .app-subtitle { color: var(--accent-easymath); }
#cardHanzi .app-subtitle { color: var(--accent-hanzi); }
#cardBpmf .app-subtitle { color: var(--accent-logo); }

.app-desc {
  font-size: 0.975rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
  line-height: 1.65;
}

.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.app-tag {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

#cardEasyMath .app-tag {
  background: rgba(143, 127, 236, 0.12);
  color: var(--accent-easymath);
}

#cardHanzi .app-tag {
  background: rgba(237, 135, 207, 0.12);
  color: var(--accent-hanzi);
}

#cardBpmf .app-tag {
  background: rgba(255, 140, 130, 0.12);
  color: var(--accent-logo);
}

.app-footer {
  margin-top: auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1.4rem;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-appstore:hover {
  opacity: 0.92;
  transform: scale(1.03);
}

.btn-appstore svg {
  fill: currentColor;
  width: 18px;
  height: 18px;
}

/* --------------------------------------------------------------------------
   7. Academy / Vision Section
   -------------------------------------------------------------------------- */
.academy-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3.25rem;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3.5rem;
  align-items: center;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg);
}

.academy-img-wrap {
  text-align: center;
}

.academy-img {
  width: 220px;
  height: 220px;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-md);
  margin: 0 auto;
  border: 2px solid var(--border-color);
}

.academy-content h3 {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.academy-content p {
  font-size: 1.075rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.academy-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.academy-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(255, 140, 130, 0.15);
  color: var(--accent-logo);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.feature-text h4 {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text-primary);
}

.feature-text p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   8. Contact Us Section
   -------------------------------------------------------------------------- */
.contact-wrap {
  max-width: 680px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

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

.form-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-label span {
  color: #ef4444;
  margin-left: 0.25rem;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1.15rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3.5px var(--accent-glow);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

.form-status {
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  display: none;
}

.form-status.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid #10b981;
  color: #10b981;
}

.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #ef4444;
  color: #ef4444;
}

/* --------------------------------------------------------------------------
   9. Footer Section
   -------------------------------------------------------------------------- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2.5rem 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.footer-brand img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.footer-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.footer-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* --------------------------------------------------------------------------
   10. Scroll Animations & Utilities
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   11. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .academy-card {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
    padding: 2.25rem;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.6rem;
  }

  .section {
    padding: 4rem 0;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: block;
  }

  .contact-wrap {
    padding: 2rem 1.5rem;
  }
}