/* ==========================================
   Photosyncity v2 — 基于 DESIGN.md 设计令牌
   Source: DESIGN.md
   ========================================== */

/* ─── Tokens ──────────────────────────────────── */
:root {
  --color-primary: #1a7a8a;
  --color-primary-light: #d4ecee;
  --color-primary-dark: #0d4f5e;
  --color-secondary: #8a8a8a;
  --color-neutral: #faf9f5;
  --color-neutral-alt: #f5f3ef;
  --color-surface: #ffffff;
  --color-border: #e5e3dd;
  --color-text: #2d2d2d;
  --color-text-muted: #8a8a8a;
  --color-text-light: #b0b0b0;
  --color-on-primary: #ffffff;
  --color-on-dark: #ffffff;
  --color-on-dark-muted: rgba(255,255,255,0.5);
  --color-dark-surface: #2d2d2d;

  --font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

  --text-h1: 700 3.5rem/1.1 var(--font-family);
  --text-h1-mobile: 700 2.25rem/1.1 var(--font-family);
  --text-h2: 700 2.25rem/1.2 var(--font-family);
  --text-h3: 600 1.125rem/1.3 var(--font-family);
  --text-body: 400 1rem/1.6 var(--font-family);
  --text-body-large: 400 1.0625rem/1.7 var(--font-family);
  --text-body-small: 400 0.875rem/1.6 var(--font-family);
  --text-label: 600 0.75rem/1 var(--font-family);
  --text-stat-number: 700 2rem/1 var(--font-family);

  --rounded-sm: 6px;
  --rounded-md: 10px;
  --rounded-lg: 16px;
  --rounded-full: 9999px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-xxl: 80px;
}

/* ─── Reset ──────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font: var(--text-body);
  background: var(--color-neutral);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-primary); text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

/* ─── Utilities ──────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 var(--space-lg); }
.section-label {
  display: inline-block; padding: 4px 12px;
  background: var(--color-primary-light); border-radius: var(--rounded-full);
  font: var(--text-label); letter-spacing: 0.06em; color: var(--color-primary);
  margin-bottom: var(--space-md);
}
.btn {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 14px 32px; border-radius: var(--rounded-sm);
  font: 600 1rem/1 var(--font-family); cursor: pointer; border: none;
  transition: all .2s; letter-spacing: -.2px;
}
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); }
.btn-outline {
  background: transparent; color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ─── Topbar ─────────────────────────────────── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0;
  background: rgba(250,249,245,.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; max-width: 1100px; margin: 0 auto; padding: 0 var(--space-lg);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.0625rem; color: var(--color-text);
  letter-spacing: -.3px;
}
.brand-mark {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-primary); display: flex; align-items: center;
  justify-content: center; color: var(--color-on-primary); font-size: 14px;
}
.nav { display: flex; gap: var(--space-lg); align-items: center; }
.nav a { font-size: .875rem; font-weight: 500; color: var(--color-text-muted); transition: color .2s; }
.nav a:hover, .nav a.active { color: var(--color-text); }
.lang-toggle {
  padding: 6px 14px; border: 1.5px solid var(--color-border); border-radius: var(--rounded-sm);
  font-size: .75rem; font-weight: 500; background: var(--color-surface);
  cursor: pointer; color: var(--color-text); font-family: var(--font-family);
  transition: border-color .2s;
}
.lang-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ─── Hero ───────────────────────────────────── */
.hero {
  min-height: 90vh; display: flex; align-items: center;
  padding: 120px var(--space-lg) 80px;
  background: linear-gradient(180deg, var(--color-neutral) 0%, var(--color-neutral-alt) 100%);
}
.hero-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr;
  gap: 60px; align-items: center;
  max-width: 1100px; margin: 0 auto; width: 100%;
}
.hero-tag {
  display: inline-block; padding: 6px 14px;
  background: var(--color-primary-light); border-radius: var(--rounded-full);
  font: var(--text-label); letter-spacing: 0.06em; color: var(--color-primary);
  margin-bottom: var(--space-lg);
}
.hero h1 { font: var(--text-h1); letter-spacing: -.02em; margin-bottom: 20px; max-width: 700px; }
.hero h1 em { font-style: normal; color: var(--color-primary); }
.hero p {
  font: var(--text-body-large); color: var(--color-text-muted);
  margin-bottom: 20px; max-width: 480px;
}
.hero-actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: var(--space-xl); margin-top: var(--space-xl); }
.hero-stat-num { font: var(--text-stat-number); color: var(--color-primary); }
.hero-stat-label { font-size: .8125rem; color: var(--color-text-muted); margin-top: 6px; }
.hero-visual {
  width: 100%; aspect-ratio: 1;
  background: radial-gradient(circle at 40% 40%, var(--color-primary-light), var(--color-neutral-alt));
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 80px; border: 1px solid var(--color-border);
}

/* ─── Sections ──────────────────────────────── */
.section { padding: var(--space-xxl) var(--space-lg) 60px; }
.section-alt { background: var(--color-surface); }
.section-title {
  text-align: center; margin-bottom: var(--space-xl);
  max-width: 600px; margin-left: auto; margin-right: auto;
}
.section-title h2 { font: var(--text-h2); letter-spacing: -.02em; margin-bottom: 12px; }
.section-title p { color: var(--color-text-muted); font-size: 1rem; }

/* ─── Cards ──────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.card {
  background: var(--color-neutral-alt); border-radius: var(--rounded-md);
  padding: 32px; border: 1px solid var(--color-border); transition: all .2s;
}
.card:hover { border-color: var(--color-primary); }
.card-icon { font-size: 28px; margin-bottom: var(--space-md); }
.card h3 { font: var(--text-h3); margin-bottom: var(--space-sm); }
.card p { font: var(--text-body-small); color: var(--color-text-muted); }
.card-light { background: var(--color-surface); }

/* ─── Product Cards ──────────────────────────── */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.product-card {
  background: var(--color-surface); border-radius: var(--rounded-md);
  overflow: hidden; border: 1px solid var(--color-border); transition: all .2s;
}
.product-card:hover { border-color: var(--color-primary); }
.product-card-img {
  height: 160px; background: var(--color-primary-light);
  display: flex; align-items: center; justify-content: center; font-size: 40px;
}
.product-card-body { padding: var(--space-lg); }
.product-card-body h3 { font: var(--text-h3); margin-bottom: 6px; }
.product-card-body p { font: var(--text-body-small); color: var(--color-text-muted); }
.product-card-tag {
  display: inline-block; margin-top: var(--space-sm); padding: 4px 10px;
  background: var(--color-primary-light); border-radius: 4px;
  font: var(--text-label); color: var(--color-primary);
}

/* ─── Stats ──────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--space-md); margin: 32px 0; }
.stat-card {
  text-align: center; padding: 28px; background: var(--color-surface);
  border-radius: var(--rounded-md); border: 1px solid var(--color-border);
}
.stat-card h3 { font: var(--text-stat-number); color: var(--color-primary); }
.stat-card p { font-size: .8125rem; color: var(--color-text-muted); margin-top: 6px; }

/* ─── Market Grid ────────────────────────────── */
.market-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--space-md); }
.market-card {
  padding: var(--space-lg); border-radius: var(--rounded-md); text-align: center;
  background: var(--color-surface); border: 1px solid var(--color-border);
}
.market-card .emoji { font-size: 28px; margin-bottom: var(--space-sm); }
.market-card h4 { font-size: .9375rem; font-weight: 600; }

/* ─── Tags ───────────────────────────────────── */
.tags { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.tag {
  padding: 6px 14px; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--rounded-full); font-size: .8125rem; color: var(--color-text-muted);
}

/* ─── Team ───────────────────────────────────── */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.team-card {
  text-align: center; padding: 32px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--rounded-md);
  transition: all .2s;
}
.team-card:hover { border-color: var(--color-primary); }
.team-avatar {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 14px;
  background: var(--color-primary-light); display: flex; align-items: center;
  justify-content: center; font-size: 20px; color: var(--color-primary); font-weight: 600;
}
.team-card h3 { font-size: .9375rem; font-weight: 600; }
.team-card .title { font-size: .8125rem; color: var(--color-primary); margin-top: 4px; }

/* ─── Page Header ────────────────────────────── */
.page-header {
  padding: 120px var(--space-lg) 60px; background: var(--color-neutral-alt);
  text-align: center;
}
.page-header h1 { font: var(--text-h2); letter-spacing: -.02em; }
.page-header p { color: var(--color-text-muted); font-size: 1rem; max-width: 500px; margin: 8px auto 0; }

/* ─── Content Body ───────────────────────────── */
.content-body { padding: 60px var(--space-lg); }
.content-body .container { max-width: 800px; }
.content-body h2 { font: var(--text-h3); margin: 40px 0 12px; }
.content-body h3 { font-weight: 600; margin: 28px 0 10px; }
.content-body p { margin-bottom: var(--space-md); font-size: .9375rem; color: var(--color-text-muted); line-height: 1.8; }
.content-body ul { margin-bottom: var(--space-md); padding-left: 20px; }
.content-body li { margin-bottom: 6px; font-size: .9375rem; color: var(--color-text-muted); }
.content-body ol { margin-bottom: var(--space-md); padding-left: 20px; }
.content-body ol li { margin-bottom: 12px; }

/* ─── Contact ────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
.contact-info h3 { font: var(--text-h3); margin-bottom: var(--space-lg); }
.contact-item { display: flex; gap: 14px; margin-bottom: 20px; }
.contact-item-icon {
  width: 44px; height: 44px; background: var(--color-primary-light);
  border-radius: var(--rounded-md); display: flex; align-items: center;
  justify-content: center; flex-shrink: 0; font-size: 18px;
}
.contact-item h4 { font-size: .875rem; font-weight: 600; }
.contact-item p { font-size: .875rem; color: var(--color-text-muted); }
.form-group { margin-bottom: var(--space-md); }
.form-group label { display: block; font-size: .8125rem; font-weight: 500; margin-bottom: 6px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--color-border);
  border-radius: var(--rounded-sm); font-size: .875rem; font-family: var(--font-family);
  transition: border-color .2s; background: var(--color-surface);
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--color-primary); }
.form-group textarea { height: 120px; resize: vertical; }

/* ─── Comparison Table ───────────────────────── */
.comp-table { width: 100%; border-collapse: collapse; margin: var(--space-lg) 0; }
.comp-table th {
  padding: 14px 16px; text-align: left; font-size: .8125rem; font-weight: 600;
  color: var(--color-text-muted); border-bottom: 1px solid var(--color-border);
}
.comp-table td { padding: 14px 16px; font-size: .875rem; border-bottom: 1px solid var(--color-border); }
.comp-table tr:hover td { background: var(--color-neutral-alt); }
.comp-table .check { color: var(--color-primary); font-weight: 700; }

/* ─── Footer ─────────────────────────────────── */
.footer {
  background: var(--color-dark-surface); color: var(--color-on-dark-muted);
  padding: var(--space-xl) var(--space-lg) 32px; font-size: .8125rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1100px; margin: 0 auto; }
.footer h4 {
  color: var(--color-on-dark); margin-bottom: var(--space-md);
  font-size: .8125rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase;
}
.footer a { display: block; color: var(--color-on-dark-muted); margin-bottom: var(--space-sm); font-size: .8125rem; }
.footer a:hover { color: var(--color-primary); }
.footer-bottom {
  text-align: center; padding-top: 32px; margin-top: 32px;
  border-top: 1px solid rgba(255,255,255,.08);
  max-width: 1100px; margin-left: auto; margin-right: auto;
}

/* ─── Responsive ─────────────────────────────── */
/* ─── Presentation / Slide Mode ────────────────── */
.slide {
  min-height: 100vh;
  display: flex !important;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 60px 24px !important;
  scroll-snap-align: start;
}
html { scroll-snap-type: y mandatory; }
.slide .container,
.slide .hero-grid,
.slide .section-title,
.slide .cards,
.slide .product-grid,
.slide .stats-grid,
.slide .market-grid {
  width: 100%;
  max-width: 1100px;
}
.slide--hero { padding-top: 80px !important; }
.slide--hero .hero-grid {
  align-items: center;
}
.slide--footer {
  justify-content: flex-start;
  padding-top: 80px !important;
}
.slide--compact .cards,
.slide--compact .product-grid,
.slide--compact .stats-grid,
.slide--compact .market-grid {
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { font: var(--text-h1-mobile); }
  .hero-stats { gap: var(--space-lg); flex-wrap: wrap; }
  .nav { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .market-grid, .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}