:root {
  --primary: #eaf2fb;          /* 标题/正文主色（深底浅字） */
  --primary-deep: #0b1f3a;     /* 深色渐变填充用 */
  --accent: #1fe0c8;           /* 霓虹青 */
  --accent2: #3b82f6;          /* 电光蓝 */
  --accent-soft: rgba(31, 182, 166, 0.14);
  --bg: #070b14;               /* 深空背景 */
  --bg-soft: #0c1320;          /* 次级面板底 */
  --panel: rgba(255, 255, 255, 0.045);
  --glass: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #d7e1ee;
  --muted: #8c9bb0;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  --radius: 16px;
  --maxw: 1180px;
  --nav-h: 68px;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, "Cascadia Code", Consolas, "PingFang SC", monospace;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(1200px 700px at 82% -8%, rgba(31, 182, 166, 0.14), transparent 60%),
    radial-gradient(900px 600px at -5% 100%, rgba(59, 130, 246, 0.12), transparent 55%);
  background-attachment: fixed;
}

/* 全局科技网格底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(1100px 700px at 70% 10%, #000 25%, transparent 80%);
  -webkit-mask-image: radial-gradient(1100px 700px at 70% 10%, #000 25%, transparent 80%);
}
body > * { position: relative; z-index: 1; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(7, 11, 20, 0.7);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 19px;
  letter-spacing: .5px;
  color: var(--primary);
}
.logo .mark {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: grid; place-items: center;
  color: #04121a; font-weight: 800; font-size: 15px;
  box-shadow: 0 0 18px rgba(31, 182, 166, 0.45);
}
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 500;
  transition: .2s;
}
.nav-links a:hover { color: var(--primary); background: var(--glass); }
.nav-links a.active { color: var(--accent); background: var(--accent-soft); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: .2s;
  font-size: 15px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #04121a;
  box-shadow: 0 8px 24px rgba(31, 182, 166, 0.28);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(31, 182, 166, 0.45); }
.btn-ghost {
  background: transparent; color: var(--primary);
  border-color: var(--border-strong);
  box-shadow: none;
}
.btn-ghost:hover { background: var(--glass); border-color: var(--accent); color: var(--accent); }
.btn-accent { background: linear-gradient(135deg, var(--accent), var(--accent2)); }
.btn-sm { padding: 7px 16px; font-size: 14px; }
.btn-block { width: 100%; }

/* user menu */
.user-menu { position: relative; }
.user-chip {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 12px 6px 6px;
  border-radius: 999px;
  border: 1px solid var(--border);
  cursor: pointer;
  background: var(--glass);
  color: var(--text);
}
.user-chip .avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #04121a; display: grid; place-items: center; font-weight: 700; font-size: 13px;
}
.dropdown {
  position: absolute; right: 0; top: 48px;
  background: rgba(12, 19, 32, 0.96);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 12px; box-shadow: var(--shadow);
  min-width: 180px; padding: 8px; display: none;
}
.dropdown.open { display: block; }
.dropdown a, .dropdown button {
  display: block; width: 100%; text-align: left;
  padding: 10px 12px; border-radius: 8px; color: var(--text);
  background: none; border: none; font-size: 14px; cursor: pointer;
}
.dropdown a:hover, .dropdown button:hover { background: var(--glass); color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 500px at 75% 10%, rgba(31, 182, 166, 0.16), transparent 60%),
    radial-gradient(700px 500px at 10% 90%, rgba(59, 130, 246, 0.14), transparent 60%);
  padding: 90px 0 70px;
}
.hero .grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(900px 500px at 70% 20%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(900px 500px at 70% 20%, #000 30%, transparent 75%);
  pointer-events: none;
}
.hero-inner { position: relative; max-width: 760px; }
.hero-inner > * { animation: rise .7s ease both; }
.hero-inner > *:nth-child(1) { animation-delay: .05s; }
.hero-inner > *:nth-child(2) { animation-delay: .15s; }
.hero-inner > *:nth-child(3) { animation-delay: .25s; }
.hero-inner > *:nth-child(4) { animation-delay: .35s; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  font-family: var(--mono); font-weight: 600; font-size: 12.5px;
  letter-spacing: 1px; border: 1px solid rgba(31, 182, 166, 0.3);
}
.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
  animation: pulse 1.8s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero h1 {
  font-size: 46px; line-height: 1.18; margin: 0 0 18px;
  color: var(--primary); font-weight: 800; letter-spacing: -0.5px;
}
.hero h1 .hl {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0 0 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.stats { display: flex; gap: 40px; margin-top: 54px; flex-wrap: wrap; }
.stat .num {
  font-size: 34px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-family: var(--mono);
}
.stat .label { color: var(--muted); font-size: 14px; }

/* ---------- Sections ---------- */
section { padding: 80px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 50px; }
.section-head .tag {
  color: var(--accent); font-weight: 700; font-size: 13px;
  letter-spacing: 3px; text-transform: uppercase; font-family: var(--mono);
}
.section-head h2 { font-size: 34px; color: var(--primary); margin: 12px 0 14px; font-weight: 800; }
.section-head p { color: var(--muted); font-size: 17px; margin: 0; }

.bg-soft { background: var(--bg-soft); }

/* 玻璃卡片 */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px; transition: .25s;
  backdrop-filter: blur(8px);
  position: relative; overflow: hidden;
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: var(--radius);
  padding: 1px; background: linear-gradient(135deg, rgba(31,182,166,.5), rgba(59,130,246,.5));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card:hover::after { opacity: 1; }
.card .icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-size: 24px; margin-bottom: 18px;
}
.card h3 { margin: 0 0 10px; color: var(--primary); font-size: 19px; }
.card p { color: var(--muted); margin: 0; font-size: 15px; }

/* feature split */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.split .visual {
  border-radius: 18px; overflow: hidden; border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--primary-deep), #123e63);
  aspect-ratio: 4/3; position: relative;
  box-shadow: 0 20px 50px rgba(0,0,0,.5);
}
.split .visual img { width: 100%; height: 100%; object-fit: cover; }
.split h2 { font-size: 32px; color: var(--primary); margin: 0 0 16px; }
.split p { color: var(--muted); }
.checklist { list-style: none; padding: 0; margin: 22px 0 0; }
.checklist li { display: flex; gap: 12px; margin-bottom: 14px; color: var(--text); }
.checklist .ck {
  flex: 0 0 24px; height: 24px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-weight: 700; font-size: 14px;
}

/* steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step { text-align: center; }
.step .n {
  width: 46px; height: 46px; border-radius: 50%; margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #04121a; display: grid; place-items: center;
  font-weight: 800; font-size: 18px; box-shadow: 0 0 16px rgba(31,182,166,.4);
}
.step h4 { margin: 0 0 8px; color: var(--primary); }
.step p { color: var(--muted); font-size: 14px; margin: 0; }

/* ---------- Forms ---------- */
.form-wrap { max-width: 520px; margin: 0 auto; }
.field { margin-bottom: 18px; }
.field label { display: block; margin-bottom: 7px; font-weight: 600; color: var(--primary); font-size: 14px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 15px; font-family: inherit; color: var(--text);
  background: rgba(255, 255, 255, 0.04); transition: .2s;
}
.field input::placeholder, .field textarea::placeholder { color: #5d6b7e; }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.field textarea { resize: vertical; min-height: 120px; }
.hint { font-size: 13px; color: var(--muted); margin-top: 6px; }

/* alert */
.alert {
  padding: 12px 16px; border-radius: 10px; margin-bottom: 18px; font-size: 14px;
  display: none;
}
.alert.show { display: block; }
.alert-err { background: rgba(192, 57, 43, 0.18); color: #ff9b8f; border: 1px solid rgba(192,57,43,.4); }
.alert-ok { background: var(--accent-soft); color: #7af0e0; border: 1px solid rgba(31,182,166,.4); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.contact-info .item { display: flex; gap: 14px; margin-bottom: 22px; }
.contact-info .ico {
  width: 44px; height: 44px; border-radius: 12px; flex: 0 0 44px;
  background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font-size: 20px;
}
.contact-info h4 { margin: 0 0 3px; color: var(--primary); font-size: 15px; }
.contact-info p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------- Dashboard ---------- */
.dash-grid { display: grid; grid-template-columns: 280px 1fr; gap: 30px; }
.dash-side {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; height: fit-content;
  backdrop-filter: blur(8px);
}
.dash-side .big-avatar {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #04121a;
  display: grid; place-items: center; font-weight: 800; font-size: 28px;
  box-shadow: 0 0 22px rgba(31,182,166,.4);
}
.dash-side h3 { text-align: center; margin: 0 0 4px; color: var(--primary); }
.dash-side .email { text-align: center; color: var(--muted); font-size: 14px; margin: 0; }
.member-tag { text-align: center; margin-top: 12px; font-size: 13px; color: var(--accent); font-weight: 600; }
.record {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 18px 20px; margin-bottom: 14px;
  backdrop-filter: blur(8px);
}
.record .meta { display: flex; justify-content: space-between; color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.record h4 { margin: 0 0 6px; color: var(--primary); }
.record p { margin: 0; color: var(--text); }
.empty { text-align: center; color: var(--muted); padding: 50px 0; }

/* ---------- Footer ---------- */
.site-footer { background: var(--primary-deep); color: #cfe0ef; padding: 56px 0 30px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 30px; }
.site-footer .f-logo { color: #fff; font-weight: 800; font-size: 20px; display: flex; align-items: center; gap: 10px; }
.site-footer .f-logo .mark { width: 32px; height: 32px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #04121a; display: grid; place-items: center; font-weight: 800; box-shadow: 0 0 16px rgba(31,182,166,.45); }
.site-footer p { color: #9fb6cc; font-size: 14px; }
.site-footer h5 { color: #fff; font-size: 15px; margin: 0 0 16px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 10px; }
.site-footer ul a { color: #cfe0ef; font-size: 14px; }
.site-footer ul a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 36px; padding-top: 20px; text-align: center; color: #8fa8c0; font-size: 13px; }

/* ---------- Gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.g-item {
  margin: 0; border-radius: var(--radius); overflow: hidden;
  background: var(--panel); border: 1px solid var(--border); box-shadow: var(--shadow);
  position: relative;
}
.g-item::after {
  content: ""; position: absolute; inset: 0; border-radius: var(--radius);
  padding: 1px; background: linear-gradient(135deg, rgba(31,182,166,.5), rgba(59,130,246,.5));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: .3s; pointer-events: none;
}
.g-item:hover::after { opacity: 1; }
.g-item img {
  width: 100%; height: 260px; object-fit: cover; display: block;
  transition: transform .45s ease;
}
.g-item:hover img { transform: scale(1.05); }
.g-item figcaption {
  padding: 14px 18px; font-size: 14px; font-weight: 600; color: var(--muted);
}

/* ---------- Misc ---------- */
.center-narrow { max-width: 560px; margin: 0 auto; }
.page-hero {
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent);
  padding: 64px 0 40px; border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: 36px; color: var(--primary); margin: 0 0 10px; font-weight: 800; }
.page-hero p { color: var(--muted); margin: 0; font-size: 17px; }
.cta-band {
  background: linear-gradient(135deg, rgba(31,182,166,.16), rgba(59,130,246,.16));
  border: 1px solid var(--border-strong);
  border-radius: 20px; padding: 56px; text-align: center; color: #fff;
  position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 36px 36px; pointer-events: none;
}
.cta-band > * { position: relative; }
.cta-band h2 { margin: 0 0 14px; font-size: 30px; color: var(--primary); }
.cta-band p { color: var(--muted); margin: 0 0 28px; font-size: 17px; }
.cta-band .btn { background: #fff; color: #04121a; box-shadow: 0 10px 30px rgba(255,255,255,.18); }

.banner-notice {
  background: rgba(255, 231, 166, 0.12); border: 1px solid rgba(255,225,168,.4); color: #ffd98a;
  font-size: 13px; padding: 10px 16px; text-align: center;
}

@media (max-width: 900px) {
  .cards, .steps { grid-template-columns: 1fr 1fr; }
  .split, .contact-grid, .dash-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 34px; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .cards, .steps, .footer-grid { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .g-item img { height: 210px; }
  .hero { padding: 60px 0 50px; }
  .stats { gap: 24px; }
}