/* ========== CSS Variables ========== */
:root {
  --color-primary: #E8A87C;
  --color-primary-hover: #C47D4F;
  --color-primary-light: #F5DCC8;
  --color-secondary: #C4A882;
  --color-secondary-hover: #E8A87C;
  --color-accent: #83BFCD;
  --color-bg-page: #F5F0EB;
  --color-bg-section-alt: #E8E3DE;
  --color-bg-card: #FFFFFF;
  --color-bg-card-hover: #F0EBE6;
  --color-text-primary: #3D3630;
  --color-text-secondary: #6B635C;
  --color-text-tertiary: #B5ADA6;
  --color-text-on-primary: #3D3630;
  --color-border: #D8D3CD;
  --color-border-light: #E8E3DE;
  --color-shadow: rgba(61, 54, 48, 0.08);
  --color-overlay: rgba(61, 54, 48, 0.5);
  --nav-blur-bg: rgba(245, 240, 235, 0.85);
  --hero-copy-width: 560px;
  --hero-mockup-width: 200px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #C47D4F;
    --color-primary-hover: #E8A87C;
    --color-primary-light: #5E4D41;
    --color-secondary: #8B7D6B;
    --color-secondary-hover: #C47D4F;
    --color-accent: #5E4D41;
    --color-bg-page: #1A1714;
    --color-bg-section-alt: #2D2824;
    --color-bg-card: #2D2824;
    --color-bg-card-hover: #3D3630;
    --color-text-primary: #F5F0EB;
    --color-text-secondary: #B5ADA6;
    --color-text-tertiary: #6B635C;
    --color-text-on-primary: #1A1714;
    --color-border: #3D3630;
    --color-border-light: #2D2824;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(0, 0, 0, 0.6);
    --nav-blur-bg: rgba(26, 23, 20, 0.85);
  }
}

[data-theme="dark"] {
  --color-primary: #C47D4F;
  --color-primary-hover: #E8A87C;
  --color-primary-light: #5E4D41;
  --color-secondary: #8B7D6B;
  --color-secondary-hover: #C47D4F;
  --color-accent: #5E4D41;
  --color-bg-page: #1A1714;
  --color-bg-section-alt: #2D2824;
  --color-bg-card: #2D2824;
  --color-bg-card-hover: #3D3630;
  --color-text-primary: #F5F0EB;
  --color-text-secondary: #B5ADA6;
  --color-text-tertiary: #6B635C;
  --color-text-on-primary: #1A1714;
  --color-border: #3D3630;
  --color-border-light: #2D2824;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(0, 0, 0, 0.6);
  --nav-blur-bg: rgba(26, 23, 20, 0.85);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-page);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

a { color: var(--color-primary); text-decoration: none; }
img { max-width: 100%; display: block; }
.lucide { display: inline-block; vertical-align: middle; }

/* ========== Utility ========== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: 88px 0;
  background-color: var(--color-bg-page);
}
.section > .container { width: 100%; min-width: 0; }
.section-alt { background-color: var(--color-bg-section-alt); }
.section-label { font-size: 14px; font-weight: 600; color: var(--color-primary); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 700; color: var(--color-text-primary); margin-bottom: 16px; line-height: 1.3; }
.section-desc { font-size: 18px; color: var(--color-text-secondary); max-width: 640px; margin: 0 auto 60px; text-align: center; }

h1, h2, h3, p,
.hero-title,
.hero-subtitle span,
.section-title,
.section-desc,
.character-greeting,
.character-intro p,
.character-card-title,
.character-card-desc,
.capability-card-title,
.capability-card-desc,
.capability-card-example,
.story-highlight,
.story-text,
.app-hint {
  text-wrap: balance;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 32px; border-radius: 12px; font-size: 16px; font-weight: 600;
  font-family: inherit; cursor: pointer; border: none; transition: all 0.2s ease;
  text-decoration: none; white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary); color: var(--color-text-on-primary);
  box-shadow: 0 4px 16px var(--color-shadow);
}
.btn-primary:hover { background: var(--color-primary-hover); transform: scale(1.02); filter: brightness(1.1); box-shadow: 0 0 24px var(--color-accent); }
.btn-outline {
  background: transparent; color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: var(--color-text-on-primary); box-shadow: 0 0 20px var(--color-accent); }
.btn-lg { padding: 18px 40px; font-size: 18px; }

/* ========== Theme Toggle ========== */
.theme-toggle {
  background: none; border: none; cursor: pointer;
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-primary); font-size: 20px;
  transition: background 0.2s;
}
.theme-toggle .lucide { width: 20px; height: 20px; }
.theme-toggle:hover { background: var(--color-primary-light); }
#langToggle { font-size: 14px; font-weight: 700; width: auto; padding: 0 10px; letter-spacing: 0.02em; }

/* ========== Navigation ========== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 72px; display: flex; align-items: center;
  background: var(--nav-blur-bg); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.nav.scrolled { box-shadow: 0 2px 20px var(--color-shadow); }
.nav .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav-brand { font-size: 22px; font-weight: 700; color: var(--color-primary); }
.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a { color: var(--color-text-secondary); font-size: 15px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav .btn-outline { padding: 8px 20px; font-size: 14px; }
.nav .btn-outline.solid { background: var(--color-primary); color: var(--color-text-on-primary); }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; color: var(--color-text-primary); }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text-primary); margin: 5px 0; border-radius: 2px; transition: 0.3s; }

/* ========== Hero ========== */
.hero {
  min-height: 100vh; min-height: 100dvh; display: flex; align-items: center; padding-top: 72px;
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-page) 0%, var(--color-bg-section-alt) 100%);
}
.cta-anchor { position: absolute; top: 0; left: 0; width: 1px; height: 1px; pointer-events: none; }
.hero-particles { position: absolute; inset: 0; pointer-events: none; }
.hero-particle {
  position: absolute; border-radius: 50%; background: var(--color-accent);
  opacity: 0; animation: float 6s ease-in-out infinite;
}
.hero-particle:nth-child(1) { width: 120px; height: 120px; top: 15%; left: 10%; animation-delay: 0s; }
.hero-particle:nth-child(2) { width: 80px; height: 80px; top: 60%; left: 80%; animation-delay: 1.5s; }
.hero-particle:nth-child(3) { width: 60px; height: 60px; top: 30%; left: 55%; animation-delay: 3s; }
.hero-particle:nth-child(4) { width: 100px; height: 100px; top: 70%; left: 25%; animation-delay: 4.5s; }
.hero-particle:nth-child(5) { width: 50px; height: 50px; top: 20%; left: 75%; animation-delay: 2s; }

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.25; }
  50% { transform: translateY(-30px) scale(1.1); opacity: 0.45; }
}

.hero > .container { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; min-width: 0; width: 100%; }
.hero-content { width: min(100%, var(--hero-copy-width)); max-width: 100%; min-width: 0; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 16px; border-radius: 999px; background: var(--color-primary-light); color: var(--color-primary); font-size: 14px; font-weight: 500; margin-bottom: 24px; }
.hero-badge .lucide { width: 14px; height: 14px; }
.hero-title { width: 100%; font-size: clamp(36px, 5vw, 54px); font-weight: 700; line-height: 1.2; margin-bottom: 20px; color: var(--color-text-primary); }
.hero-title em { font-style: normal; color: var(--color-primary); }
.hero-subtitle { display: flex; flex-direction: column; gap: 4px; width: 100%; font-size: 18px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 36px; }
.hero-cta { display: flex; flex-direction: row; align-items: center; gap: 16px; }
.store-btn {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  width: 112px; height: 112px; padding: 14px 10px; border-radius: 24px;
  font-family: inherit; cursor: pointer; border: none; transition: all 0.2s ease;
  text-decoration: none; line-height: 1.2; color: var(--color-text-on-primary);
  background: var(--color-primary); box-shadow: 0 4px 16px var(--color-shadow);
}
.store-btn-icon { display: flex; align-items: center; justify-content: center; }
.store-btn-icon svg { width: 36px; height: 36px; fill: currentColor; }
.store-btn-name { font-size: 14px; font-weight: 600; }
.store-btn:not(.is-disabled):hover { background: var(--color-primary-hover); transform: scale(1.04); filter: brightness(1.08); }
.store-btn.is-disabled,
.store-btn[aria-disabled="true"] {
  opacity: 0.65; cursor: default; pointer-events: none; filter: grayscale(0.15);
}
.store-btn-badge { font-size: 11px; font-weight: 500; opacity: 0.85; }

.hero-visual {
  display: flex; align-items: center; justify-content: center; position: relative; min-width: 0;
}
.hero-character {
  width: 280px; height: 280px; border-radius: 50%;
  animation: breathe 3s ease-in-out infinite;
  filter: drop-shadow(0 0 40px var(--color-shadow));
  object-fit: cover;
  -webkit-mask-image: radial-gradient(circle, black 92%, transparent 100%);
  mask-image: radial-gradient(circle, black 92%, transparent 100%);
}
.hero-visual::before {
  content: ""; position: absolute; inset: -4px;
  background: url(/static/avatar.jpg) center/cover no-repeat;
  filter: blur(8px); opacity: 0.6; z-index: -1;
  border-radius: 50%;
}
@keyframes breathe {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-mockup {
  position: absolute; right: -40px; bottom: -20px;
  display: flex; flex-direction: column; align-items: flex-start;
  width: var(--hero-mockup-width); background: var(--color-bg-card); border-radius: 20px;
  padding: 16px; box-shadow: 0 8px 32px var(--color-shadow);
  border: 1px solid var(--color-border);
}
.hero-mockup-bar { align-self: stretch; height: 4px; background: var(--color-border); border-radius: 2px; margin-bottom: 12px; }
.hero-mockup-msg {
  width: fit-content;
  max-width: 100%;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 12px;
  margin-bottom: 6px;
}
.hero-mockup-msg.user { align-self: flex-end; background: var(--color-border-light); color: var(--color-text-primary); text-align: right; }
.hero-mockup-msg.ai { background: var(--color-primary); color: var(--color-text-on-primary); }

/* ========== Character Section ========== */
.character-section { text-align: center; }
.character-greeting { font-family: 'Plus Jakarta Sans', 'Noto Sans SC', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif; font-size: clamp(24px, 3.5vw, 36px); font-weight: 400; margin-bottom: 8px; color: var(--color-text-primary); }
.character-intro { max-width: 680px; margin: 0 auto; }
.character-intro p { font-size: 18px; color: var(--color-text-secondary); margin-bottom: 12px; line-height: 1.8; }
.character-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.character-card {
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: 16px; padding: 32px 24px; text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.character-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px var(--color-shadow); }
.character-card-icon { margin-bottom: 16px; color: var(--color-primary); }
.character-card-icon .lucide { width: 40px; height: 40px; }
.character-card-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--color-text-primary); }
.character-card-desc { font-size: 15px; color: var(--color-text-secondary); line-height: 1.7; }

/* ========== Capabilities Section ========== */
.capabilities-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.capability-card {
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: 16px; padding: 36px 28px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
  position: relative; overflow: hidden;
}
.capability-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px var(--color-shadow); background: var(--color-bg-card-hover); }
.capability-card-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; color: var(--color-primary);
  background: var(--color-primary-light);
}
.capability-card-icon .lucide { width: 28px; height: 28px; }
.capability-card-title { font-size: 20px; font-weight: 600; margin-bottom: 8px; color: var(--color-text-primary); }
.capability-card-desc { font-size: 15px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 16px; }
.capability-card-example {
  background: var(--color-primary-light); padding: 12px 16px;
  border-radius: 10px; font-size: 14px; color: var(--color-primary);
  font-style: italic; line-height: 1.5;
}

/* ========== Scenarios Section ========== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 880px;
  margin: 0 auto;
}
.scenario-card {
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: 16px; padding: 24px; display: flex; flex-direction: column; gap: 14px; align-items: flex-start;
  height: 100%;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px var(--color-shadow); }
.scenario-icon {
  flex-shrink: 0; width: 64px; height: 64px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light); color: var(--color-primary);
}
.scenario-icon .lucide { width: 32px; height: 32px; }
.scenario-content h3 { font-size: 18px; font-weight: 600; margin-bottom: 4px; color: var(--color-text-primary); }
.scenario-content .tag { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 500; background: var(--color-primary-light); color: var(--color-primary); margin-bottom: 8px; }
.scenario-content p { font-size: 15px; color: var(--color-text-secondary); line-height: 1.6; }

/* ========== Stories Section ========== */
.stories-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.story-card {
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: 16px; padding: 32px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.story-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px var(--color-shadow); }
.story-avatar {
  width: 48px; height: 48px; border-radius: 50%; margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-section-alt));
  display: flex; align-items: center; justify-content: center; color: var(--color-primary);
}
.story-avatar .lucide { width: 22px; height: 22px; }
.story-highlight { font-size: 16px; font-weight: 600; color: var(--color-text-primary); margin-bottom: 8px; }
.story-text { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 12px; }

/* ========== CTA Section ========== */
.cta-section { text-align: center; padding: 80px 0; }
.cta-section .section-desc { margin-bottom: 32px; }

/* ========== Footer ========== */
.footer {
  background: var(--color-bg-section-alt); border-top: 1px solid var(--color-border);
  padding: 60px 0 48px;
}
.footer-inner {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 64px;
}
.footer-brand {
  flex: 0 0 200px; display: flex; flex-direction: column; align-items: flex-start; gap: 20px;
}
.footer-copy { font-size: 13px; color: var(--color-text-tertiary); }
.footer-social { display: flex; align-items: center; gap: 20px; }
.footer-social a {
  width: 20px; height: 20px; padding: 0; background: none; border-radius: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-tertiary); transition: color 0.2s;
}
.footer-social a:hover { background: none; color: var(--color-text-primary); }
.footer-social svg { width: 20px; height: 20px; display: block; }
.footer-grid {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  justify-content: end;
  gap: 64px;
  margin-left: auto;
}
.footer-col h4 { font-size: 15px; font-weight: 600; margin-bottom: 16px; color: var(--color-text-primary); }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 14px; color: var(--color-text-secondary); transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--color-primary); }

/* ========== Scroll progress ========== */
.scroll-progress {
  position: fixed;
  top: 50%;
  right: 14px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transform: translateY(-50%);
  pointer-events: none;
}
.scroll-progress-tick {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--color-text-tertiary);
}
.scroll-progress-tick.active {
  height: 16px;
  background: var(--color-primary);
}

/* ========== Scroll Reveal ========== */
.reveal { opacity: 0; transition: none; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* ========== Responsive ========== */
@media (max-width: 1200px) {
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 14px; }
  .nav .btn-outline { padding: 8px 14px; font-size: 13px; }
  .nav-actions { gap: 8px; }
  .hero > .container { grid-template-columns: 1fr; text-align: center; gap: 40px; }
  .hero-content { margin-inline: auto; }
  .hero-cta { margin-inline: auto; justify-content: center; width: 100%; }
  .hero-visual { order: -1; }
  .hero-character { width: 200px; height: 200px; }
  .hero-mockup { display: none; }
  .capabilities-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .stories-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 800px) {
  .section { padding: 88px 0 28px; }
  .section-desc { font-size: 16px; margin-bottom: 28px; }
  .hero { min-height: 100dvh; padding: 88px 0 36px; }
  .hero-title { font-size: 30px; margin-bottom: 12px; }
  .hero-badge { max-width: 100%; white-space: normal; justify-content: center; margin-bottom: 16px; }
  .hero-subtitle { font-size: 16px; margin-bottom: 24px; }
  .hero-visual { min-width: 0; }
  .character-intro p { font-size: 16px; margin-bottom: 8px; }
  .capability-card { padding: 20px 16px; }
  .capability-card-desc { margin-bottom: 12px; }
  .scenario-card { padding: 20px 16px; }
  .story-card { padding: 20px 16px; }
  .cta-section { padding: 48px 0; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0;
    background: var(--nav-blur-bg); backdrop-filter: blur(12px); padding: 20px 24px; gap: 16px;
    border-bottom: 1px solid var(--color-border-light);
  }
  .menu-toggle { display: block; }
  .character-cards { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
  .stories-grid { grid-template-columns: 1fr; }
  .scenario-card { flex-direction: column; gap: 16px; }
  .footer-inner { flex-direction: column-reverse; gap: 40px; }
  .footer-brand { flex: none; width: 100%; align-items: center; }
  .footer-grid {
    grid-auto-flow: row;
    grid-template-columns: 1fr 1fr;
    grid-auto-columns: unset;
    justify-content: stretch;
    gap: 24px;
    width: 100%;
    margin-left: 0;
  }
}


/* ========== App gate page ========== */
.app-main {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 112px 24px 64px;
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg-page) 0%, var(--color-bg-section-alt) 100%);
}
.app-main .hero-visual { margin-bottom: 28px; }
.app-main .hero-title,
.app-main .hero-subtitle { max-width: var(--hero-copy-width); }
.app-main .hero-cta { justify-content: center; }
.app-hint {
  display: none;
  max-width: 480px;
  margin: 0 auto 24px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--color-primary-light);
  color: var(--color-text-primary);
  font-size: 15px;
  line-height: 1.6;
}
.app-hint.is-visible { display: block; }