/* ============================================================
   LONGTEK 龙太科官网 · 设计系统
   方向：深空任务控制 HUD 风 —— 数智孪生 × 航天级精密
   ============================================================ */

:root {
  --bg: #05080f;
  --bg-2: #080d1a;
  --bg-3: #0b1224;
  --surface: rgba(148, 184, 255, 0.045);
  --surface-2: rgba(148, 184, 255, 0.08);
  --line: rgba(148, 184, 255, 0.14);
  --line-strong: rgba(148, 184, 255, 0.28);
  --text: #e9effc;
  --muted: #8fa0c4;
  --dim: #5d6c8f;
  --cyan: #3ee6ff;
  --blue: #4f7cff;
  --violet: #9d6bff;
  --amber: #ffb454;
  --grad: linear-gradient(100deg, var(--cyan), var(--blue) 55%, var(--violet));
  --font-disp: "Chakra Petch", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --nav-h: 72px;
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(62, 230, 255, 0.25); }

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

/* ---------- 全局氛围层 ---------- */
.ambient {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(52% 38% at 78% -6%, rgba(79, 124, 255, 0.16), transparent 62%),
    radial-gradient(44% 34% at 8% 12%, rgba(62, 230, 255, 0.09), transparent 60%),
    radial-gradient(60% 50% at 50% 115%, rgba(157, 107, 255, 0.10), transparent 65%),
    var(--bg);
}
.grain {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.028 0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 通用布局 ---------- */
.wrap { width: min(1200px, 92vw); margin: 0 auto; }
.section { padding: 110px 0; position: relative; }
.section.tight { padding: 80px 0; }

.eyebrow {
  font-family: var(--font-disp);
  font-size: 13px; letter-spacing: 0.32em; text-transform: uppercase;
  color: var(--cyan); display: flex; align-items: center; gap: 14px;
  margin-bottom: 22px;
}
.eyebrow::before { content: ""; width: 34px; height: 1px; background: var(--grad); }
.eyebrow .idx { color: var(--dim); letter-spacing: 0.1em; }

.h-display {
  font-family: var(--font-disp);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: 0.01em;
}
.h-xl { font-size: clamp(34px, 4.6vw, 58px); }
.h-lg { font-size: clamp(28px, 3.4vw, 42px); }
.h-md { font-size: clamp(20px, 2.2vw, 26px); }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.lead { color: var(--muted); font-size: 17px; max-width: 720px; }
.center { text-align: center; }
.center .lead { margin-left: auto; margin-right: auto; }
.center .eyebrow { justify-content: center; }
.center .eyebrow::after { content: ""; width: 34px; height: 1px; background: var(--grad); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-disp); font-size: 15px; font-weight: 600;
  letter-spacing: 0.06em; padding: 15px 30px; border-radius: 8px;
  position: relative; transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  cursor: pointer; border: 0; white-space: nowrap;
}
.btn-primary {
  color: #04121c;
  background: linear-gradient(100deg, #6ceeff, #4f8dff 60%, #8f6bff);
  box-shadow: 0 0 0 1px rgba(120, 200, 255, 0.35), 0 12px 34px -10px rgba(79, 124, 255, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px rgba(120, 200, 255, 0.5), 0 18px 44px -10px rgba(79, 124, 255, 0.7); }
.btn-ghost {
  color: var(--text);
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.btn-ghost:hover { background: var(--surface-2); transform: translateY(-2px); }
.btn .arr { transition: transform 0.25s ease; }
.btn:hover .arr { transform: translateX(4px); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}
.nav.scrolled {
  background: rgba(5, 8, 15, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--line);
}
.nav-inner {
  width: min(1280px, 94vw); margin: 0 auto; height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 38px; height: 38px; border-radius: 9px; position: relative; flex: none;
  background: conic-gradient(from 210deg, #3ee6ff, #4f7cff, #9d6bff, #3ee6ff);
  display: grid; place-items: center;
}
.logo-mark::after {
  content: ""; position: absolute; inset: 2px; border-radius: 7px; background: #070c18;
}
.logo-mark span {
  position: relative; z-index: 1; font-family: var(--font-disp);
  font-weight: 700; font-size: 17px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.logo-text { line-height: 1.15; }
.logo-text b { font-family: var(--font-disp); font-size: 17px; letter-spacing: 0.04em; display: block; }
.logo-text small { font-size: 11px; color: var(--dim); letter-spacing: 0.28em; font-family: var(--font-disp); }

/* 真实 Logo 图片 */
.logo-img { height: 40px; width: auto; display: block; }
.footer .logo-img { height: 46px; }
@media (max-width: 560px) { .logo-img { height: 32px; } .footer .logo-img { height: 38px; } }

.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav-links a {
  font-size: 15px; color: var(--muted); padding: 9px 16px; border-radius: 8px;
  position: relative; transition: color 0.2s ease, background 0.2s ease;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--text); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 3px; height: 2px;
  background: var(--grad); border-radius: 2px;
}
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-cta .btn { padding: 11px 22px; font-size: 14px; }

.nav-burger {
  display: none; width: 42px; height: 42px; border-radius: 8px;
  background: var(--surface); border: 1px solid var(--line); cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-burger i { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.25s; }
.nav-burger.open i:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open i:nth-child(2) { opacity: 0; }
.nav-burger.open i:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-burger { display: flex; }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: rgba(5, 8, 15, 0.96); backdrop-filter: blur(20px);
    padding: 14px 4vw 22px; border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: 0.28s ease;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 13px 14px; font-size: 16px; }
  .nav-links a.active::after { display: none; }
  .nav-cta .btn { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh; display: flex; align-items: center;
  padding: calc(var(--nav-h) + 60px) 0 90px; position: relative; overflow: hidden;
}
#hero-canvas { position: absolute; inset: 0; z-index: -1; }
.hero-scan {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: repeating-linear-gradient(0deg, transparent 0 3px, rgba(62, 230, 255, 0.012) 3px 4px);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-disp); font-size: 13px; letter-spacing: 0.22em;
  color: var(--cyan); border: 1px solid rgba(62, 230, 255, 0.3);
  background: rgba(62, 230, 255, 0.06); padding: 8px 16px; border-radius: 100px;
  margin-bottom: 30px;
}
.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); animation: pulse 2.2s infinite; }
@keyframes pulse { 50% { opacity: 0.35; } }
.hero h1 { font-size: clamp(38px, 5.4vw, 68px); margin-bottom: 26px; }
.hero .lead { font-size: 18px; margin-bottom: 40px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero 右侧 HUD 面板 */
.hud {
  position: relative; border: 1px solid var(--line); border-radius: 18px;
  background: linear-gradient(160deg, rgba(148, 184, 255, 0.07), rgba(148, 184, 255, 0.015));
  backdrop-filter: blur(8px); padding: 28px;
  box-shadow: 0 40px 90px -40px rgba(0, 10, 40, 0.9);
}
.hud-corner { position: absolute; width: 22px; height: 22px; border-color: var(--cyan); border-style: solid; opacity: 0.9; }
.hud-corner.tl { top: -1px; left: -1px; border-width: 2px 0 0 2px; border-radius: 18px 0 0 0; }
.hud-corner.tr { top: -1px; right: -1px; border-width: 2px 2px 0 0; border-radius: 0 18px 0 0; }
.hud-corner.bl { bottom: -1px; left: -1px; border-width: 0 0 2px 2px; border-radius: 0 0 0 18px; }
.hud-corner.br { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; border-radius: 0 0 18px 0; }
.hud-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.hud-title { font-family: var(--font-disp); font-size: 13px; letter-spacing: 0.28em; color: var(--muted); }
.hud-live { font-family: var(--font-disp); font-size: 11px; letter-spacing: 0.2em; color: var(--cyan); display: flex; align-items: center; gap: 8px; }
.hud-live::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); animation: pulse 1.6s infinite; }
.hud-flow { display: flex; flex-direction: column; gap: 0; }
.hud-node {
  display: flex; gap: 16px; align-items: flex-start; padding: 18px;
  border: 1px solid var(--line); border-radius: 12px; background: rgba(5, 10, 22, 0.55);
  position: relative; transition: border-color 0.3s, transform 0.3s;
}
.hud-node:hover { border-color: rgba(62, 230, 255, 0.45); transform: translateX(4px); }
.hud-node + .hud-link { height: 26px; display: flex; justify-content: center; }
.hud-node + .hud-link::before {
  content: ""; width: 1px; background: linear-gradient(180deg, rgba(62, 230, 255, 0.6), rgba(157, 107, 255, 0.6));
  animation: flow 1.8s linear infinite; background-size: 100% 200%;
}
@keyframes flow { 0% { background-position: 0 -100%; } 100% { background-position: 0 100%; } }
.hud-node .n-idx {
  font-family: var(--font-disp); font-size: 12px; color: var(--cyan);
  border: 1px solid rgba(62, 230, 255, 0.35); border-radius: 6px; padding: 3px 8px; flex: none;
  letter-spacing: 0.1em;
}
.hud-node b { font-size: 16px; display: block; margin-bottom: 3px; font-weight: 600; }
.hud-node small { color: var(--muted); font-size: 13px; line-height: 1.6; display: block; }

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { min-height: auto; }
}

/* ---------- 数据条 ---------- */
.stats {
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(148, 184, 255, 0.03), transparent);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 44px 30px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; }
.stat .num {
  font-family: var(--font-disp); font-size: clamp(34px, 3.6vw, 48px); font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  line-height: 1.1; display: flex; align-items: baseline; gap: 4px;
}
.stat .num i { font-style: normal; font-size: 0.55em; }
.stat p { color: var(--muted); font-size: 14px; margin-top: 8px; }
@media (max-width: 800px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-left: 0; }
  .stat { padding: 30px 22px; border-top: 1px solid var(--line); }
  .stat:nth-child(-n+2) { border-top: 0; }
}

/* ---------- 卡片 ---------- */
.cards { display: grid; gap: 22px; }
.cards.c2 { grid-template-columns: repeat(2, 1fr); }
.cards.c3 { grid-template-columns: repeat(3, 1fr); }
.cards.c4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .cards.c3, .cards.c4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .cards.c2, .cards.c3, .cards.c4 { grid-template-columns: 1fr; } }

.card {
  position: relative; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(165deg, var(--surface-2), rgba(148, 184, 255, 0.015));
  padding: 30px; overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity 0.4s;
  background: radial-gradient(420px 200px at var(--mx, 50%) var(--my, 0%), rgba(62, 230, 255, 0.09), transparent 70%);
  pointer-events: none;
}
.card:hover { transform: translateY(-5px); border-color: rgba(62, 230, 255, 0.4); box-shadow: 0 26px 60px -30px rgba(20, 80, 180, 0.5); }
.card:hover::before { opacity: 1; }

.card .c-icon {
  width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(62, 230, 255, 0.08); border: 1px solid rgba(62, 230, 255, 0.25);
  margin-bottom: 20px; color: var(--cyan);
}
.card .c-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 19px; margin-bottom: 4px; font-weight: 600; font-family: var(--font-disp); letter-spacing: 0.02em; }
.card .c-sub { font-family: var(--font-disp); font-size: 12px; letter-spacing: 0.18em; color: var(--dim); text-transform: uppercase; margin-bottom: 14px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tag {
  font-size: 12px; color: var(--muted); border: 1px solid var(--line);
  padding: 4px 11px; border-radius: 100px; background: rgba(5, 10, 22, 0.4);
}
.tag.hot { color: var(--cyan); border-color: rgba(62, 230, 255, 0.35); }

/* ---------- 飞轮 / 流程 ---------- */
.flywheel { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 60px; }
.fw-step { position: relative; padding: 36px 34px; border-top: 1px solid var(--line); }
.fw-step::before {
  content: ""; position: absolute; top: -1px; left: 0; width: 64px; height: 2px; background: var(--grad);
}
.fw-step .fw-num {
  font-family: var(--font-disp); font-size: 64px; font-weight: 700; line-height: 1;
  color: transparent; -webkit-text-stroke: 1px rgba(148, 184, 255, 0.3);
  margin-bottom: 18px;
}
.fw-step h3 { font-family: var(--font-disp); font-size: 21px; margin-bottom: 10px; }
.fw-step p { color: var(--muted); font-size: 14.5px; }
.fw-loop { text-align: center; margin-top: 34px; color: var(--dim); font-family: var(--font-disp); font-size: 13px; letter-spacing: 0.24em; }
.fw-loop b { color: var(--cyan); font-weight: 600; }
@media (max-width: 800px) { .flywheel { grid-template-columns: 1fr; } .fw-step { border-top: 0; border-left: 1px solid var(--line); } .fw-step::before { top: 0; left: -1px; width: 2px; height: 64px; } }

/* ---------- 品牌跑马灯 ---------- */
.marquee { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 22px 0; position: relative; }
.marquee::before, .marquee::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 120px; z-index: 1; pointer-events: none;
}
.marquee::before { left: 0; background: linear-gradient(90deg, var(--bg), transparent); }
.marquee::after { right: 0; background: linear-gradient(-90deg, var(--bg), transparent); }
.marquee-track { display: flex; gap: 64px; width: max-content; animation: mq 30s linear infinite; }
.marquee-track span {
  font-family: var(--font-disp); font-size: 15px; letter-spacing: 0.24em; color: var(--dim);
  display: flex; align-items: center; gap: 64px; white-space: nowrap;
}
.marquee-track span::after { content: "◆"; font-size: 8px; color: rgba(62, 230, 255, 0.5); }
@keyframes mq { to { transform: translateX(-50%); } }

/* ---------- 架构图 ---------- */
.arch { display: flex; flex-direction: column; gap: 18px; margin-top: 56px; }
.arch-layer {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(120deg, var(--surface), transparent);
  padding: 26px 30px; display: grid; grid-template-columns: 230px 1fr; gap: 26px; align-items: center;
  position: relative; transition: border-color 0.3s;
}
.arch-layer:hover { border-color: rgba(62, 230, 255, 0.4); }
.arch-layer .al-label .lv { font-family: var(--font-disp); font-size: 11px; letter-spacing: 0.3em; color: var(--dim); display: block; margin-bottom: 8px; }
.arch-layer .al-label b { font-family: var(--font-disp); font-size: 21px; display: block; line-height: 1.3; }
.arch-layer .al-label small { color: var(--muted); font-size: 13px; display: block; margin-top: 6px; }
.arch-layer .al-items { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-size: 13.5px; padding: 9px 16px; border-radius: 9px;
  border: 1px solid var(--line); background: rgba(5, 10, 22, 0.5); color: var(--text);
  transition: 0.25s;
}
.chip:hover { border-color: rgba(62, 230, 255, 0.5); color: var(--cyan); transform: translateY(-2px); }
.chip.star { border-color: rgba(255, 180, 84, 0.4); color: var(--amber); }
.arch-flow { text-align: center; color: var(--dim); font-size: 20px; line-height: 1; }
@media (max-width: 800px) { .arch-layer { grid-template-columns: 1fr; gap: 16px; } }

/* ---------- 行业方案 ---------- */
.indu { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
@media (max-width: 800px) { .indu { grid-template-columns: 1fr; } }
.indu-card {
  position: relative; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px; overflow: hidden; min-height: 250px;
  background: linear-gradient(150deg, var(--surface-2), rgba(5, 10, 22, 0.4));
  display: flex; flex-direction: column; justify-content: flex-end;
  transition: transform 0.35s, border-color 0.35s;
}
.indu-card:hover { transform: translateY(-5px); border-color: rgba(62, 230, 255, 0.45); }
.indu-card .ic-bg {
  position: absolute; top: -40px; right: -40px; width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 124, 255, 0.16), transparent 70%);
}
.indu-card .ic-code {
  position: absolute; top: 26px; right: 30px; font-family: var(--font-disp);
  font-size: 13px; letter-spacing: 0.3em; color: var(--dim);
}
.indu-card h3 { font-family: var(--font-disp); font-size: 23px; margin-bottom: 6px; }
.indu-card .ic-en { font-family: var(--font-disp); font-size: 12px; letter-spacing: 0.24em; color: var(--cyan); text-transform: uppercase; margin-bottom: 14px; }
.indu-card p { color: var(--muted); font-size: 14.5px; margin-bottom: 16px; }

/* ---------- 列表 / 时间线 ---------- */
.timeline { position: relative; margin-top: 50px; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 1px; background: linear-gradient(180deg, var(--cyan), var(--violet)); opacity: 0.5; }
.tl-item { position: relative; padding-bottom: 42px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -30px; top: 8px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--cyan); box-shadow: 0 0 12px rgba(62, 230, 255, 0.7);
}
.tl-item .tl-phase { font-family: var(--font-disp); font-size: 13px; letter-spacing: 0.2em; color: var(--cyan); margin-bottom: 6px; }
.tl-item h3 { font-size: 18px; margin-bottom: 8px; font-weight: 600; }
.tl-item p { color: var(--muted); font-size: 14.5px; max-width: 640px; }

/* ---------- CTA ---------- */
.cta-band {
  position: relative; border: 1px solid var(--line-strong); border-radius: 22px; overflow: hidden;
  padding: 70px 8%; text-align: center;
  background:
    radial-gradient(60% 120% at 50% -20%, rgba(79, 124, 255, 0.25), transparent 60%),
    linear-gradient(180deg, var(--bg-3), var(--bg-2));
}
.cta-band .h-display { margin-bottom: 18px; }
.cta-band p { color: var(--muted); max-width: 560px; margin: 0 auto 36px; }
.cta-band .hero-actions { justify-content: center; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); background: var(--bg-2); padding: 70px 0 0; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 54px; }
.footer h4 { font-family: var(--font-disp); font-size: 14px; letter-spacing: 0.16em; color: var(--text); margin-bottom: 18px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 11px; }
.footer li a { color: var(--muted); font-size: 14px; transition: color 0.2s; }
.footer li a:hover { color: var(--cyan); }
.footer .f-desc { color: var(--muted); font-size: 14px; max-width: 300px; margin-top: 16px; }
.footer-bar {
  border-top: 1px solid var(--line); padding: 22px 0; display: flex; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; color: var(--dim); font-size: 13px;
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- 页头（内页） ---------- */
.page-head { padding: calc(var(--nav-h) + 90px) 0 70px; position: relative; overflow: hidden; }
.page-head .lead { margin-top: 22px; }
.page-head::after {
  content: ""; position: absolute; right: -140px; top: 40px; width: 480px; height: 480px;
  border: 1px solid var(--line); border-radius: 50%; opacity: 0.5; pointer-events: none;
  background: radial-gradient(circle, rgba(79, 124, 255, 0.1), transparent 65%);
}
.page-head::before {
  content: ""; position: absolute; right: -60px; top: 120px; width: 320px; height: 320px;
  border: 1px dashed rgba(148, 184, 255, 0.2); border-radius: 50%; pointer-events: none;
  animation: spin 60s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 滚动显现 ---------- */
.rv { opacity: 0; transform: translateY(30px); transition: opacity 0.8s cubic-bezier(0.2, 0.6, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.6, 0.2, 1); }
.rv.in { opacity: 1; transform: none; }
.rv-d1 { transition-delay: 0.1s; } .rv-d2 { transition-delay: 0.2s; } .rv-d3 { transition-delay: 0.3s; }

/* ---------- 表单 ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px; letter-spacing: 0.06em; }
.field input, .field select, .field textarea {
  width: 100%; background: rgba(5, 10, 22, 0.6); border: 1px solid var(--line);
  border-radius: 9px; color: var(--text); font-family: var(--font-body); font-size: 15px;
  padding: 13px 16px; outline: none; transition: border-color 0.25s, box-shadow 0.25s;
}
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: rgba(62, 230, 255, 0.55); box-shadow: 0 0 0 3px rgba(62, 230, 255, 0.1);
}
.field select option { background: var(--bg-3); }

/* ---------- 联系信息卡 ---------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 26px; align-items: start; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
.info-line { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.info-line:last-child { border-bottom: 0; }
.info-line .il-icon {
  width: 44px; height: 44px; flex: none; border-radius: 10px; display: grid; place-items: center;
  background: rgba(62, 230, 255, 0.08); border: 1px solid rgba(62, 230, 255, 0.22); color: var(--cyan);
}
.info-line .il-icon svg { width: 21px; height: 21px; }
.info-line b { display: block; font-size: 15px; margin-bottom: 3px; }
.info-line span { color: var(--muted); font-size: 14px; }

/* ---------- 工具类 ---------- */
.mt-40 { margin-top: 40px; } .mt-60 { margin-top: 60px; }
.note { color: var(--dim); font-size: 13px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 36px; } }

.check-list { list-style: none; margin-top: 24px; }
.check-list li { display: flex; gap: 14px; margin-bottom: 16px; color: var(--muted); font-size: 15px; }
.check-list li::before {
  content: ""; flex: none; width: 20px; height: 20px; margin-top: 3px; border-radius: 6px;
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2305080f' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center / 12px no-repeat,
    linear-gradient(120deg, var(--cyan), var(--blue));
}
.check-list li b { color: var(--text); font-weight: 600; }

/* 表单提示 toast */
.toast {
  position: fixed; left: 50%; bottom: 34px; transform: translate(-50%, 20px);
  background: rgba(8, 14, 28, 0.95); border: 1px solid rgba(62, 230, 255, 0.4);
  color: var(--text); padding: 14px 26px; border-radius: 10px; font-size: 14.5px;
  opacity: 0; pointer-events: none; transition: 0.35s ease; z-index: 200;
  box-shadow: 0 18px 50px -18px rgba(0, 20, 60, 0.9);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }