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

:root {
  --bg: #0a0e14;
  --bg-2: #0d1219;
  --bg-3: #111820;
  --border: #1c2530;
  --fg: #e8edf2;
  --fg-muted: #9aa8b8;
  --fg-dim: #7a8a9a;
  --accent: #3ea6ff;
  --accent-hover: #5cb8ff;
}

html { scroll-behavior:smooth; }

body {
  font-family:"Inter","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);
  color:var(--fg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

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

/* ===== Nav ===== */
nav {
  position:fixed; top:0; width:100%;
  background:rgba(10,14,20,.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  z-index:100;
}
.nav-inner {
  max-width:1200px; margin:auto;
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 24px;
}
.logo {
  font-size:20px; font-weight:800;
  letter-spacing:2px; color:#fff;
}
.logo span { color:var(--accent); }
.nav-right { display:flex; align-items:center; gap:32px; }
.nav-links { display:flex; gap:28px; font-size:14px; }
.nav-links a {
  color:var(--fg-muted);
  transition:.2s;
  position:relative;
}
.nav-links a:hover,
.nav-links a.active { color:var(--accent); }
.nav-links a.active::after {
  content:'';
  position:absolute; bottom:-6px; left:0; right:0;
  height:2px; background:var(--accent);
}

/* Language Switcher */
.lang-switch {
  display:flex; gap:4px;
  background:var(--bg-3);
  border:1px solid var(--border);
  border-radius:6px;
  padding:2px;
}
.lang-switch a {
  font-size:12px;
  padding:4px 10px;
  border-radius:4px;
  color:var(--fg-dim);
  transition:.2s;
}
.lang-switch a:hover { color:var(--accent); }
.lang-switch a.active {
  background:var(--accent);
  color:var(--bg);
  font-weight:600;
}

/* ===== Buttons ===== */
.btn {
  display:inline-block;
  padding:14px 36px;
  border-radius:6px;
  font-size:16px; font-weight:600;
  transition:.25s;
  cursor:pointer;
  border:none;
}
.btn-primary {
  background:var(--accent); color:var(--bg);
}
.btn-primary:hover {
  background:var(--accent-hover);
  transform:translateY(-2px);
}
.btn-ghost {
  border:1px solid #2a3a4a; color:var(--fg);
  background:transparent;
}
.btn-ghost:hover {
  border-color:var(--accent); color:var(--accent);
}

/* ===== Hero ===== */
.hero {
  min-height:100vh;
  display:flex; align-items:center; justify-content:center;
  text-align:center;
  background:radial-gradient(ellipse at 50% 30%, #12243a 0%, var(--bg) 70%);
  padding:120px 24px 80px;
}
.hero h1 {
  font-size:52px; font-weight:800;
  line-height:1.2; margin-bottom:24px;
}
.hero h1 em { font-style:normal; color:var(--accent); }
.hero p {
  font-size:18px; color:var(--fg-muted);
  max-width:680px; margin:0 auto 40px;
}
.hero-btns {
  display:flex; gap:16px;
  justify-content:center; flex-wrap:wrap;
}

/* ===== Page Header ===== */
.page-header {
  padding:160px 24px 60px;
  text-align:center;
  background:radial-gradient(ellipse at 50% 0%, #12243a 0%, var(--bg) 70%);
  border-bottom:1px solid var(--border);
}
.page-header h1 {
  font-size:44px; font-weight:800;
  margin-bottom:12px;
}
.page-header p {
  color:var(--fg-muted);
  font-size:17px; max-width:640px; margin:0 auto;
}

/* ===== Stats ===== */
.stats {
  display:flex; justify-content:center;
  gap:60px; padding:48px 24px;
  flex-wrap:wrap;
  background:var(--bg-2);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.stat { text-align:center; }
.stat b {
  display:block; font-size:36px;
  color:var(--accent); font-weight:800;
}
.stat span {
  font-size:13px; color:var(--fg-dim);
  letter-spacing:1px; text-transform:uppercase;
}

/* ===== Sections ===== */
section {
  padding:100px 24px;
  max-width:1200px;
  margin:auto;
}
.sec-title {
  font-size:36px; font-weight:800;
  margin-bottom:12px; text-align:center;
}
.sec-sub {
  text-align:center; color:var(--fg-dim);
  margin-bottom:56px; font-size:15px;
}

/* ===== Cards ===== */
.grid {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:24px;
}
.card {
  background:var(--bg-3);
  border:1px solid var(--border);
  border-radius:10px;
  padding:32px 28px;
  transition:.25s;
}
.card:hover {
  border-color:var(--accent);
  transform:translateY(-4px);
}
.card h3 { font-size:20px; margin-bottom:8px; }
.card .tag {
  display:inline-block;
  font-size:12px; color:var(--accent);
  border:1px solid #1e3a55;
  padding:2px 10px; border-radius:20px;
  margin-bottom:16px;
}
.card ul { list-style:none; font-size:14px; color:var(--fg-muted); }
.card ul li {
  padding:5px 0;
  border-bottom:1px dashed var(--border);
}
.card ul li:last-child { border:none; }
.card ul li b { color:var(--fg); float:right; }

/* ===== Table ===== */
.compare {
  width:100%; border-collapse:collapse;
  font-size:15px;
}
.compare th, .compare td {
  padding:16px 20px; text-align:left;
  border-bottom:1px solid var(--border);
}
.compare th {
  color:var(--fg-dim); font-weight:600;
  font-size:13px; letter-spacing:1px;
  text-transform:uppercase;
}
.compare td:first-child { color:var(--fg-muted); }
.compare .hl { color:var(--accent); font-weight:700; }

/* ===== Scenes ===== */
.scenes {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:20px;
}
.scene {
  background:linear-gradient(160deg,var(--bg-3),var(--bg-2));
  border:1px solid var(--border);
  border-radius:10px;
  padding:28px;
}
.scene h4 {
  font-size:17px; margin-bottom:10px;
  color:var(--accent);
}
.scene p { font-size:14px; color:#8a9aaa; }

/* ===== Features ===== */
.feature {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:60px;
  align-items:center;
  margin-bottom:80px;
}
.feature:last-child { margin-bottom:0; }
.feature.reverse { direction:rtl; }
.feature.reverse > * { direction:ltr; }
.feature h3 {
  font-size:28px; margin-bottom:16px;
}
.feature h3 span { color:var(--accent); }
.feature p {
  color:var(--fg-muted);
  font-size:16px; margin-bottom:16px;
}
.feature ul {
  list-style:none; color:var(--fg-muted);
  font-size:15px;
}
.feature ul li {
  padding:8px 0 8px 24px;
  position:relative;
}
.feature ul li::before {
  content:'▸';
  position:absolute; left:0;
  color:var(--accent);
}
.feature-visual {
  background:linear-gradient(160deg,#12243a,var(--bg-2));
  border:1px solid var(--border);
  border-radius:12px;
  padding:48px;
  text-align:center;
  font-size:64px;
  color:var(--accent);
}

/* ===== Values ===== */
.values {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:24px;
}
.value {
  background:var(--bg-3);
  border:1px solid var(--border);
  border-radius:10px;
  padding:32px 28px;
}
.value h4 {
  color:var(--accent);
  font-size:18px; margin-bottom:12px;
}
.value p { font-size:14px; color:var(--fg-muted); }

/* ===== Contact ===== */
.contact-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:24px;
}
.contact-card {
  background:var(--bg-3);
  border:1px solid var(--border);
  border-radius:10px;
  padding:36px 28px;
  text-align:center;
  transition:.25s;
}
.contact-card:hover {
  border-color:var(--accent);
  transform:translateY(-4px);
}
.contact-card .icon {
  font-size:36px; margin-bottom:16px;
  color:var(--accent);
}
.contact-card h4 {
  font-size:18px; margin-bottom:8px;
}
.contact-card a {
  color:var(--accent);
  font-size:15px;
}
.contact-card p {
  color:var(--fg-muted);
  font-size:14px; margin-top:8px;
}

/* ===== CTA ===== */
.cta {
  text-align:center;
  padding:80px 24px;
  background:linear-gradient(180deg,var(--bg-2),var(--bg));
  border-top:1px solid var(--border);
}
.cta h2 { font-size:32px; margin-bottom:16px; }
.cta p { color:var(--fg-dim); margin-bottom:32px; }

/* ===== Footer ===== */
footer {
  padding:60px 24px 40px;
  border-top:1px solid var(--border);
  background:var(--bg-2);
}
.footer-inner {
  max-width:1200px; margin:auto;
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}
.footer-brand .logo { margin-bottom:16px; }
.footer-brand p {
  color:var(--fg-dim);
  font-size:14px; max-width:280px;
}
.footer-col h5 {
  font-size:14px; color:var(--fg);
  margin-bottom:16px;
  text-transform:uppercase;
  letter-spacing:1px;
}
.footer-col a {
  display:block;
  color:var(--fg-dim);
  font-size:14px;
  padding:4px 0;
  transition:.2s;
}
.footer-col a:hover { color:var(--accent); }
.footer-bottom {
  max-width:1200px; margin:40px auto 0;
  padding-top:24px;
  border-top:1px solid var(--border);
  text-align:center;
  color:#4a5a6a;
  font-size:13px;
}

/* ===== Responsive ===== */
@media(max-width:900px){
  .feature { grid-template-columns:1fr; gap:32px; }
  .feature.reverse { direction:ltr; }
  .footer-inner { grid-template-columns:1fr 1fr; }
  .nav-right { gap:16px; }
}
@media(max-width:768px){
  .hero h1 { font-size:34px; }
  .page-header h1 { font-size:32px; }
  .nav-links { display:none; }
  .stats { gap:32px; }
  .stat b { font-size:28px; }
  .footer-inner { grid-template-columns:1fr; }
}