:root {
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-primary: #141414;
  --text-secondary: #555555;
  --text-tertiary: #8c8c8c;
  --accent: #1a1a2e;
  --accent-light: #2d2d44;
  --border: #e5e5e5;
  --border-light: #f0f0f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.04);
  --shadow-md: 0 4px 24px rgba(0,0,0,.06);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.08);
  --radius: 12px;
  --radius-sm: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', -apple-system, sans-serif;
  background: #fafafa;
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* NAV */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(250,250,250,.88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--border-light); background: rgba(250,250,250,.96); }
.nav-inner { max-width: 1240px; margin: 0 auto; padding: 0 32px; height: 60px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-family: 'DM Sans','Noto Sans SC',sans-serif; font-size: 18px; font-weight: 700; color: var(--accent); letter-spacing: -.5px; text-decoration: none; }
.nav-links { display: flex; gap: 28px; list-style: none; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-secondary); font-size: 13px; font-weight: 400; transition: color .2s; }
.nav-links a:hover { color: var(--text-primary); }
.nav-cta { background: var(--accent); color: #fff !important; padding: 7px 18px; border-radius: 18px; font-weight: 500 !important; font-size: 12px !important; transition: background .2s,transform .2s !important; }
.nav-cta:hover { background: var(--accent-light); transform: translateY(-1px); }

/* HERO */
.hero { padding: 140px 32px 100px; text-align: center; position: relative; overflow: hidden; background: var(--bg); }
.hero::before { content: ''; position: absolute; top: -30%; left: -10%; width: 60%; height: 100%; background: radial-gradient(ellipse at center, rgba(26,26,46,.025) 0%, transparent 70%); border-radius: 50%; pointer-events: none; }
.hero-content { max-width: 680px; margin: 0 auto; position: relative; z-index: 1; }
.hero-badge { display: inline-block; padding: 5px 14px; border: 1px solid var(--border); border-radius: 16px; font-size: 12px; color: var(--text-secondary); letter-spacing: .5px; margin-bottom: 28px; animation: fadeInUp .6s ease both; }
.hero-title { font-family: 'DM Sans','Noto Sans SC',sans-serif; font-size: clamp(36px,5.5vw,56px); font-weight: 700; line-height: 1.14; letter-spacing: -1.2px; margin-bottom: 20px; animation: fadeInUp .6s .1s ease both; }
.hero-title em { font-style: normal; color: var(--accent); }
.hero-desc { font-size: 17px; color: var(--text-secondary); line-height: 1.75; margin-bottom: 40px; animation: fadeInUp .6s .2s ease both; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; animation: fadeInUp .6s .3s ease both; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 32px; border-radius: 24px; font-size: 14px; font-weight: 500; text-decoration: none; transition: all .25s; cursor: pointer; border: none; font-family: inherit; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 16px rgba(26,26,46,.2); }
.btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(26,26,46,.28); }
.btn-outline { background: transparent; color: var(--text-primary); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.hero-meta { margin-top: 20px; font-size: 12px; color: var(--text-tertiary); animation: fadeInUp .6s .4s ease both; }

/* SECTIONS */
.section { padding: 90px 32px; }
.section-narrow { padding: 60px 32px; }
.section-inner { max-width: 1240px; margin: 0 auto; }
.section-label { font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 1.5px; color: var(--text-tertiary); margin-bottom: 12px; }
.section-title { font-family: 'DM Sans','Noto Sans SC',sans-serif; font-size: clamp(26px,4vw,36px); font-weight: 700; letter-spacing: -.5px; margin-bottom: 12px; }
.section-desc { font-size: 15px; color: var(--text-secondary); max-width: 560px; line-height: 1.7; }

/* STATS BANNER */
.stats-row { display: flex; gap: 32px; margin: 48px 0 0; flex-wrap: wrap; }
.stat-item { flex: 1; min-width: 160px; padding: 28px 24px; background: var(--bg); border-radius: var(--radius); border: 1px solid var(--border-light); transition: box-shadow .25s; }
.stat-item:hover { box-shadow: var(--shadow-md); }
.stat-num { font-family: 'DM Sans',sans-serif; font-size: 36px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* FEATURE GRID */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 48px; }
.feature-card { background: var(--bg); border-radius: var(--radius); padding: 36px 28px; border: 1px solid var(--border-light); transition: box-shadow .25s,transform .25s; }
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.feature-icon { width: 40px; height: 40px; border-radius: var(--radius-sm); background: var(--bg-secondary); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; color: var(--accent); }
.feature-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; letter-spacing: -.2px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.65; }

/* PLATFORM CARDS */
.platform-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 48px; }
.platform-card { background: var(--bg); border-radius: var(--radius); padding: 48px 40px; border: 1px solid var(--border-light); position: relative; overflow: hidden; }
.platform-card:hover { box-shadow: var(--shadow-md); }
.platform-icon { width: 48px; height: 48px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; margin-bottom: 24px; font-size: 22px; }
.platform-icon.pc { background: #e8edf2; color: var(--accent); }
.platform-icon.mp { background: #eef2e8; color: #2d4a22; }
.platform-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.platform-card .desc { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.6; }
.feature-list { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.feature-list li { font-size: 13px; color: var(--text-secondary); padding-left: 18px; position: relative; }
.feature-list li::before { content: ''; position: absolute; left: 0; top: 8px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-light); }
.platform-card.mp .feature-list li::before { background: #2d4a22; }

/* WORKFLOW */
.workflow { margin-top: 48px; display: flex; gap: 0; align-items: stretch; background: var(--bg); border-radius: var(--radius); border: 1px solid var(--border-light); overflow: hidden; }
.workflow-step { flex: 1; padding: 36px 28px; text-align: center; position: relative; }
.workflow-step + .workflow-step { border-left: 1px solid var(--border-light); }
.workflow-num { width: 32px; height: 32px; border-radius: 50%; background: var(--bg-secondary); display: inline-flex; align-items: center; justify-content: center; font-family: 'DM Sans',sans-serif; font-size: 14px; font-weight: 600; color: var(--accent); margin-bottom: 14px; }
.workflow-step h4 { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.workflow-step p { font-size: 12px; color: var(--text-secondary); line-height: 1.5; }
.workflow-arrow { display: flex; align-items: center; color: var(--border); font-size: 20px; padding: 0 4px; }

/* STATUS FLOW */
.status-flow { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; justify-content: center; align-items: center; }
.status-badge { padding: 8px 16px; border-radius: 20px; font-size: 12px; font-weight: 500; border: 1px solid var(--border-light); }
.status-badge.white { background: #fdfdfd; color: #666; }
.status-badge.yellow { background: #fefce8; color: #a16207; }
.status-badge.orange { background: #fff7ed; color: #c2410c; }
.status-badge.green { background: #f0fdf4; color: #166534; }
.status-badge.red { background: #fef2f2; color: #991b1b; }
.status-badge.blue { background: #eff6ff; color: #1e40af; }
.status-arrow { color: var(--text-tertiary); font-size: 16px; padding: 0 2px; }

/* DOWNLOAD CTA */
.cta-card { background: var(--accent); border-radius: 16px; padding: 64px 48px; text-align: center; color: #fff; margin-top: 64px; }
.cta-card .section-label { color: rgba(255,255,255,.55); }
.cta-card .section-title { color: #fff; }
.cta-card .section-desc { color: rgba(255,255,255,.65); margin: 0 auto; }
.cta-btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 44px; border-radius: 28px; font-size: 15px; font-weight: 600; background: #fff; color: var(--accent); text-decoration: none; transition: all .25s; margin-top: 32px; }
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,.2); }
.cta-meta { margin-top: 20px; font-size: 12px; color: rgba(255,255,255,.45); display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.cta-meta span { display: flex; align-items: center; gap: 5px; }

/* FOOTER */
.footer { padding: 32px; border-top: 1px solid var(--border-light); background: var(--bg); }
.footer-inner { max-width: 1240px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text-tertiary); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-tertiary); text-decoration: none; transition: color .2s; }
.footer-links a:hover { color: var(--text-primary); }

/* ANIMATIONS */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity .7s ease,transform .7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* RESPONSIVE */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: 1fr; }
  .platform-row { grid-template-columns: 1fr; }
  .workflow { flex-direction: column; }
  .workflow-step + .workflow-step { border-left: none; border-top: 1px solid var(--border-light); }
  .workflow-arrow { display: none; }
  .nav-inner { padding: 0 20px; }
  .nav-links { display: none; }
  .hero { padding: 100px 20px 60px; }
  .section { padding: 60px 20px; }
  .section-narrow { padding: 40px 20px; }
  .feature-list { grid-template-columns: 1fr; }
  .platform-card { padding: 32px 24px; }
  .footer-inner { flex-direction: column; gap: 10px; }
  .stats-row { gap: 16px; }
  .stat-item { min-width: 140px; padding: 20px 16px; }
  .stat-num { font-size: 28px; }
}
@media (max-width: 600px) {
  .hero-title { font-size: 28px; }
  .hero-desc { font-size: 15px; }
  .btn { padding: 11px 24px; font-size: 13px; }
  .cta-card { padding: 40px 20px; }
}