/* ==========================================================
   快连加速器 KLINK BOOSTER - 全站样式
   深色科技风 / 速度感 / 多页面共用
   ========================================================== */

:root {
  --bg: #06090f;
  --bg-2: #0a101c;
  --panel: #0e1729;
  --panel-2: #121e34;
  --line: rgba(255, 255, 255, 0.08);
  --line-soft: rgba(255, 255, 255, 0.05);
  --text: #e9eefb;
  --text-2: #c3cde0;
  --muted: #8f9db5;
  --primary: #3b7bff;
  --cyan: #22d3ee;
  --mint: #7cf5c8;
  --warn: #ffb648;
  --grad: linear-gradient(115deg, #3b7bff 0%, #22d3ee 55%, #7cf5c8 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img, svg { max-width: 100%; display: block; }
button { font-family: inherit; }

.container { width: min(1200px, 90%); margin: 0 auto; }

::selection { background: rgba(59, 123, 255, 0.35); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #070b13; }
::-webkit-scrollbar-thumb { background: #1b2740; border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: #27375a; }

/* ---------------- 顶栏 ---------------- */
.top-strip {
  background: #070c15;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--muted);
}
.top-strip .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; height: 38px; flex-wrap: wrap;
}
.top-strip .dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--mint); margin-right: 7px; box-shadow: 0 0 8px var(--mint);
}
.top-strip .links a { margin-left: 20px; transition: color 0.25s; }
.top-strip .links a:hover { color: var(--text); }

/* ---------------- 头部导航 ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 200;
  background: rgba(6, 9, 15, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.site-header.scrolled {
  background: rgba(6, 9, 15, 0.94);
  border-bottom-color: var(--line);
}
.header-inner { display: flex; align-items: center; gap: 26px; height: 74px; }

.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand-icon {
  width: 40px; height: 40px; border-radius: 11px;
  background: var(--grad); color: #04121a;
  display: flex; align-items: center; justify-content: center;
  font-size: 21px; font-weight: 800;
  box-shadow: 0 6px 20px rgba(34, 211, 238, 0.28);
}
.brand-name { font-size: 19px; font-weight: 700; letter-spacing: 1px; line-height: 1.1; }
.brand-name em {
  display: block; font-style: normal; font-size: 10.5px;
  letter-spacing: 2.4px; color: var(--muted); font-weight: 400; margin-top: 3px;
}

.main-nav { margin-left: auto; }
.main-nav > ul { display: flex; gap: 2px; }
.main-nav > ul > li > a {
  display: block; padding: 9px 14px; font-size: 15px;
  color: var(--text-2); border-radius: 8px;
  transition: color 0.25s, background 0.25s;
}
.main-nav > ul > li > a:hover { color: #fff; background: rgba(255, 255, 255, 0.05); }
.main-nav > ul > li > a.active {
  color: #fff;
  background: linear-gradient(180deg, rgba(59, 123, 255, 0.24), rgba(34, 211, 238, 0.1));
  box-shadow: inset 0 0 0 1px rgba(59, 123, 255, 0.35);
}

.header-actions { display: flex; align-items: center; gap: 14px; margin-left: 8px; }
.link-login { font-size: 14.5px; color: var(--text-2); transition: color 0.25s; }
.link-login:hover { color: #fff; }

.nav-toggle {
  display: none; background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; margin: 5px 0;
  background: var(--text); border-radius: 2px; transition: 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, border-color 0.25s;
}
.btn-primary {
  background: var(--grad); color: #04121a;
  box-shadow: 0 10px 28px rgba(34, 211, 238, 0.22);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(34, 211, 238, 0.34); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--line-strong, rgba(255, 255, 255, 0.18));
  color: var(--text);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.3); }
.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-lg { padding: 16px 38px; font-size: 16.5px; }
.btn-block { width: 100%; }

/* ---------------- 通用区块 ---------------- */
.section { padding: 92px 0; position: relative; }
.section-tight { padding: 64px 0; }
.section-alt { background: linear-gradient(180deg, #070c16 0%, #0a101c 100%); }
.section-line { border-top: 1px solid var(--line-soft); }

.eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: 3px;
  color: var(--cyan); margin-bottom: 16px; text-transform: uppercase;
}
.sec-head { max-width: 760px; margin-bottom: 54px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head h2 {
  font-size: clamp(26px, 3.4vw, 40px); line-height: 1.32; letter-spacing: 1px;
  font-weight: 700;
}
.sec-head h2 .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sec-head p { margin-top: 16px; color: var(--muted); font-size: 16.5px; line-height: 1.85; }

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

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative; padding: 96px 0 110px; overflow: hidden;
  background:
    radial-gradient(900px 460px at 78% 8%, rgba(59, 123, 255, 0.20), transparent 62%),
    radial-gradient(700px 420px at 12% 86%, rgba(124, 245, 200, 0.12), transparent 66%),
    #06090f;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  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: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 30%, #000 24%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, #000 24%, transparent 72%);
}
.hero .container { position: relative; z-index: 2; }
.hero-grid {
  display: grid; grid-template-columns: 1.08fr 0.92fr;
  gap: 58px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 999px;
  border: 1px solid rgba(59, 123, 255, 0.4);
  background: rgba(59, 123, 255, 0.1);
  font-size: 13px; color: #a9c8ff; margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(32px, 4.6vw, 56px); line-height: 1.24;
  letter-spacing: 1px; font-weight: 800;
}
.hero h1 span { display: block; }
.hero-sub {
  margin: 22px 0 34px; font-size: 17.5px; color: var(--text-2);
  max-width: 540px; line-height: 1.9;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-meta {
  display: flex; gap: 36px; margin-top: 44px; flex-wrap: wrap;
}
.hero-meta div strong {
  display: block; font-size: 26px; font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1.3;
}
.hero-meta div span { font-size: 13.5px; color: var(--muted); }

/* 加速面板（右侧可视化） */
.speed-panel {
  background: linear-gradient(180deg, rgba(18, 30, 52, 0.95), rgba(10, 16, 28, 0.95));
  border: 1px solid var(--line);
  border-radius: 22px; padding: 26px;
  box-shadow: var(--shadow);
  position: relative;
}
.speed-panel::before {
  content: ""; position: absolute; inset: -1px; border-radius: 22px; padding: 1px;
  background: linear-gradient(140deg, rgba(59, 123, 255, 0.55), transparent 45%, rgba(34, 211, 238, 0.45));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.panel-title { font-size: 14px; color: var(--muted); letter-spacing: 1px; }
.panel-status {
  display: flex; align-items: center; gap: 7px;
  font-size: 12.5px; color: var(--mint);
  padding: 4px 12px; border-radius: 999px;
  background: rgba(124, 245, 200, 0.1);
}
.panel-status i {
  width: 6px; height: 6px; border-radius: 50%; background: var(--mint);
  animation: pulse 1.8s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(124,245,200,.6);} 50% { opacity: .5; box-shadow: 0 0 0 6px rgba(124,245,200,0);} }

.panel-metric { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.panel-metric b {
  font-size: 44px; font-weight: 800; letter-spacing: -1px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.panel-metric span { font-size: 13px; color: var(--muted); }

.node-list { margin-top: 22px; display: grid; gap: 11px; }
.node-row {
  display: grid; grid-template-columns: 92px 1fr 64px;
  align-items: center; gap: 12px; font-size: 13px; color: var(--text-2);
}
.node-row .bar {
  height: 6px; border-radius: 999px; background: rgba(255, 255, 255, 0.07); overflow: hidden;
}
.node-row .bar i {
  display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, #3b7bff, #22d3ee);
  width: 0; transition: width 1.4s var(--ease);
}
.node-row em { font-style: normal; text-align: right; color: var(--mint); font-size: 12.5px; }

/* ---------------- 优势卡片 ---------------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  background: linear-gradient(180deg, rgba(18, 30, 52, 0.7), rgba(10, 16, 28, 0.55));
  border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 28px;
  transition: transform 0.35s var(--ease), border-color 0.35s, box-shadow 0.35s;
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 123, 255, 0.45);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.4);
}
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(59, 123, 255, 0.12);
  border: 1px solid rgba(59, 123, 255, 0.22);
  font-size: 24px; margin-bottom: 20px;
}
.feature-card h3 { font-size: 19px; margin-bottom: 10px; font-weight: 600; }
.feature-card p { font-size: 14.5px; color: var(--muted); line-height: 1.85; }
.feature-card .tag-row { margin-top: 16px; display: flex; gap: 8px; flex-wrap: wrap; }
.feature-card .tag-row span {
  font-size: 12px; color: #9db8e0; padding: 3px 10px;
  border-radius: 999px; background: rgba(255, 255, 255, 0.05);
}

/* ---------------- 三步骤 ---------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
.step {
  position: relative; padding: 34px 28px 30px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(14, 23, 41, 0.6);
}
.step::before {
  counter-increment: step; content: "0" counter(step);
  position: absolute; top: 18px; right: 24px;
  font-size: 42px; font-weight: 800; color: rgba(255, 255, 255, 0.05);
  letter-spacing: -2px;
}
.step h3 { font-size: 18px; margin-bottom: 10px; }
.step p { font-size: 14.5px; color: var(--muted); }
.step .step-arrow {
  position: absolute; right: -20px; top: 50%; transform: translateY(-50%);
  color: rgba(59, 123, 255, 0.5); font-size: 18px;
}
.step:last-child .step-arrow { display: none; }

/* ---------------- 数据带 ---------------- */
.stats-band {
  background: linear-gradient(115deg, rgba(59, 123, 255, 0.14), rgba(34, 211, 238, 0.06));
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 54px 0;
}
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stats-row .num {
  font-size: 42px; font-weight: 800; line-height: 1.2;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stats-row .num small { font-size: 20px; }
.stats-row p { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* ---------------- 场景卡 ---------------- */
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.scene-card {
  display: flex; gap: 20px; padding: 28px;
  border-radius: var(--radius); border: 1px solid var(--line);
  background: rgba(14, 23, 41, 0.55);
  transition: border-color 0.3s, background 0.3s, transform 0.3s var(--ease);
}
.scene-card:hover { border-color: rgba(34, 211, 238, 0.4); background: rgba(18, 30, 52, 0.7); transform: translateY(-4px); }
.scene-emoji {
  flex-shrink: 0; width: 54px; height: 54px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; background: rgba(34, 211, 238, 0.1);
}
.scene-card h3 { font-size: 18px; margin-bottom: 8px; }
.scene-card p { font-size: 14.5px; color: var(--muted); }
.scene-card .metric { margin-top: 12px; font-size: 13px; color: var(--mint); }

/* ---------------- 套餐 ---------------- */
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; align-items: stretch; }
.plan {
  border: 1px solid var(--line); border-radius: 20px; padding: 32px 26px;
  background: rgba(12, 20, 35, 0.75);
  display: flex; flex-direction: column;
  transition: transform 0.35s var(--ease), border-color 0.35s, box-shadow 0.35s;
}
.plan:hover { transform: translateY(-6px); border-color: rgba(255, 255, 255, 0.22); }
.plan.featured {
  border-color: rgba(59, 123, 255, 0.65);
  background: linear-gradient(180deg, rgba(26, 45, 82, 0.9), rgba(12, 20, 35, 0.9));
  box-shadow: 0 26px 60px rgba(20, 60, 140, 0.35);
  position: relative;
}
.plan.featured::before {
  content: "最受欢迎"; position: absolute; top: 14px; right: 18px;
  font-size: 11.5px; letter-spacing: 1px; color: #04121a;
  background: var(--grad); padding: 3px 10px; border-radius: 999px; font-weight: 700;
}
.plan-name { font-size: 17px; font-weight: 600; }
.plan-desc { font-size: 13px; color: var(--muted); margin-top: 6px; min-height: 38px; }
.plan-price { display: flex; align-items: baseline; gap: 6px; margin: 16px 0 4px; }
.plan-price b {
  font-size: 38px; font-weight: 800; letter-spacing: -1px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.plan-price span { font-size: 13px; color: var(--muted); }
.plan-note { font-size: 12.5px; color: var(--text-2); margin-bottom: 20px; }
.plan ul { display: grid; gap: 10px; margin: 0 0 24px; flex: 1; }
.plan li { font-size: 14px; color: var(--text-2); padding-left: 24px; position: relative; }
.plan li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--mint); font-size: 13px; font-weight: 700;
}

/* 价格切换 */
.price-switch {
  display: inline-flex; padding: 5px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03);
  margin: 0 auto 42px; gap: 4px;
}
.price-switch button {
  border: none; background: transparent; color: var(--muted);
  padding: 8px 22px; border-radius: 999px; cursor: pointer;
  font-size: 14px; transition: 0.25s;
}
.price-switch button.active { background: var(--grad); color: #04121a; font-weight: 700; }
.price-switch-wrap { text-align: center; }

/* ---------------- 对比表 ---------------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.compare {
  width: 100%; border-collapse: collapse; min-width: 720px; font-size: 14.5px;
}
table.compare th, table.compare td {
  padding: 16px 20px; text-align: left;
  border-bottom: 1px solid var(--line-soft);
}
table.compare thead th {
  background: rgba(255, 255, 255, 0.04); color: var(--text);
  font-weight: 600; font-size: 14px; white-space: nowrap;
}
table.compare td:first-child { color: var(--text-2); }
table.compare tbody tr:hover { background: rgba(255, 255, 255, 0.02); }
table.compare td .yes { color: var(--mint); }
table.compare td .no { color: #5b6a83; }

/* ---------------- 常见问题 ---------------- */
.faq { max-width: 900px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--line-soft);
}
.faq-q {
  width: 100%; text-align: left; background: none; border: none;
  color: var(--text); font-size: 16.5px; font-weight: 500;
  padding: 22px 40px 22px 0; cursor: pointer; position: relative;
  transition: color 0.25s;
}
.faq-q:hover { color: var(--cyan); }
.faq-q::after {
  content: "+"; position: absolute; right: 6px; top: 50%;
  transform: translateY(-50%); font-size: 22px; color: var(--cyan);
  transition: transform 0.3s;
}
.faq-item.open .faq-q::after { transform: translateY(-50%) rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s var(--ease);
}
.faq-a p { padding: 0 0 22px; color: var(--muted); font-size: 15px; line-height: 1.9; }

/* ---------------- 评价 ---------------- */
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.quote {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; background: rgba(12, 20, 35, 0.7);
}
.quote-stars { color: var(--warn); letter-spacing: 2px; font-size: 13px; margin-bottom: 14px; }
.quote p { font-size: 14.8px; color: var(--text-2); line-height: 1.9; }
.quote-user { display: flex; align-items: center; gap: 12px; margin-top: 20px; }
.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--grad); color: #04121a;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px;
}
.quote-user strong { display: block; font-size: 14px; font-weight: 600; }
.quote-user span { font-size: 12.5px; color: var(--muted); }

/* ---------------- CTA 横幅 ---------------- */
.cta-band {
  position: relative; overflow: hidden;
  border-radius: 26px; padding: 62px 40px; text-align: center;
  background:
    radial-gradient(600px 260px at 20% 10%, rgba(59, 123, 255, 0.35), transparent 65%),
    radial-gradient(520px 240px at 82% 90%, rgba(124, 245, 200, 0.22), transparent 65%),
    #0c1526;
  border: 1px solid rgba(59, 123, 255, 0.28);
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); letter-spacing: 1px; }
.cta-band p { color: var(--muted); margin: 14px auto 30px; max-width: 620px; font-size: 15.5px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------------- 内页 Hero ---------------- */
.page-hero {
  position: relative; padding: 74px 0 64px; overflow: hidden;
  background:
    radial-gradient(760px 340px at 82% 0%, rgba(59, 123, 255, 0.20), transparent 62%),
    linear-gradient(180deg, #080d17, #06090f);
  border-bottom: 1px solid var(--line-soft);
}
.page-hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: linear-gradient(to bottom, #000, transparent 78%);
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent 78%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 2; }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--cyan); }
.crumb span { color: var(--text-2); }
.page-hero h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.3; letter-spacing: 1px; }
.page-hero p.lead {
  margin-top: 16px; max-width: 720px; color: var(--text-2); font-size: 16.5px; line-height: 1.9;
}

/* ---------------- 产品页 Tabs ---------------- */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 34px; }
.tab-btn {
  padding: 10px 22px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03);
  color: var(--text-2); font-size: 14.5px; transition: 0.25s;
}
.tab-btn.active { background: var(--grad); color: #04121a; border-color: transparent; font-weight: 700; }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp 0.45s var(--ease); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.spec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.spec-item {
  display: flex; justify-content: space-between; gap: 16px;
  padding: 16px 20px; border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03); border: 1px solid var(--line-soft);
  font-size: 14.5px;
}
.spec-item dt { color: var(--muted); }
.spec-item dd { color: var(--text); font-weight: 500; text-align: right; }

/* ---------------- 时间线 ---------------- */
.timeline { position: relative; padding-left: 26px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px;
  width: 1px; background: linear-gradient(180deg, var(--primary), rgba(34, 211, 238, 0.15));
}
.tl-item { position: relative; padding: 0 0 34px 22px; }
.tl-item::before {
  content: ""; position: absolute; left: -26px; top: 7px;
  width: 11px; height: 11px; border-radius: 50%;
  background: #0a101c; border: 2px solid var(--cyan);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.5);
}
.tl-year { font-size: 13px; color: var(--cyan); letter-spacing: 2px; margin-bottom: 4px; }
.tl-item h3 { font-size: 17px; margin-bottom: 6px; }
.tl-item p { font-size: 14.5px; color: var(--muted); }

/* ---------------- 资讯 ---------------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.news-card {
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: rgba(12, 20, 35, 0.7);
  display: flex; flex-direction: column;
  transition: transform 0.3s var(--ease), border-color 0.3s;
}
.news-card:hover { transform: translateY(-5px); border-color: rgba(59, 123, 255, 0.4); }
.news-thumb {
  height: 148px; display: flex; align-items: center; justify-content: center;
  font-size: 44px;
  background: linear-gradient(135deg, rgba(59, 123, 255, 0.18), rgba(34, 211, 238, 0.06));
  border-bottom: 1px solid var(--line-soft);
}
.news-body { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.news-cat {
  align-self: flex-start; font-size: 11.5px; letter-spacing: 1px;
  color: #a9c8ff; background: rgba(59, 123, 255, 0.14);
  padding: 2px 10px; border-radius: 999px; margin-bottom: 12px;
}
.news-card h3 { font-size: 16.5px; line-height: 1.55; margin-bottom: 10px; }
.news-card p { font-size: 13.8px; color: var(--muted); flex: 1; }
.news-foot {
  margin-top: 16px; font-size: 12.5px; color: #6f7f99;
  display: flex; justify-content: space-between; align-items: center;
}
.news-foot .arrow { color: var(--cyan); }

/* ---------------- 联系页 ---------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 40px; align-items: start; }
.info-list { display: grid; gap: 16px; }
.info-item {
  display: flex; gap: 16px; padding: 22px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(12, 20, 35, 0.6);
}
.info-item .ico {
  width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(59, 123, 255, 0.12); font-size: 20px;
}
.info-item h3 { font-size: 15px; margin-bottom: 4px; }
.info-item p, .info-item a { font-size: 14.5px; color: var(--muted); }
.info-item a:hover { color: var(--cyan); }

.form-card {
  border: 1px solid var(--line); border-radius: 20px; padding: 34px;
  background: linear-gradient(180deg, rgba(18, 30, 52, 0.85), rgba(10, 16, 28, 0.85));
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; color: var(--text-2); margin-bottom: 8px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 15px; font-size: 14.5px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-radius: 10px; color: var(--text);
  font-family: inherit; outline: none;
  transition: border-color 0.25s, background 0.25s;
}
.field input::placeholder, .field textarea::placeholder { color: #5f6d86; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: rgba(59, 123, 255, 0.65);
  background: rgba(59, 123, 255, 0.06);
}
.field textarea { resize: vertical; min-height: 120px; }
.field select option { background: #0e1729; color: var(--text); }
.form-tip { font-size: 12.5px; color: var(--muted); margin-top: 14px; }
.form-msg { font-size: 14px; margin-top: 14px; min-height: 22px; color: var(--mint); }

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: #04070d; border-top: 1px solid var(--line-soft);
  padding-top: 62px; margin-top: 0;
}
.footer-top {
  display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 40px;
  padding-bottom: 46px;
}
.footer-brand p { color: var(--muted); font-size: 14px; margin-top: 16px; max-width: 300px; line-height: 1.9; }
.footer-badges { display: flex; gap: 8px; margin-top: 18px; flex-wrap: wrap; }
.footer-badges span {
  font-size: 12px; color: #8fa3c4; padding: 4px 12px;
  border: 1px solid var(--line); border-radius: 999px;
}
.footer-col h4 { font-size: 14.5px; margin-bottom: 18px; color: var(--text); letter-spacing: 0.5px; }
.footer-col ul { display: grid; gap: 11px; }
.footer-col a { font-size: 14px; color: var(--muted); transition: color 0.25s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  border-top: 1px solid var(--line-soft);
  padding: 22px 0; display: flex; justify-content: space-between;
  gap: 14px; flex-wrap: wrap;
  font-size: 12.8px; color: #6f7f99;
}

/* ---------------- 悬浮工具 ---------------- */
.back-top {
  position: fixed; right: 26px; bottom: 28px; z-index: 120;
  width: 46px; height: 46px; border-radius: 12px;
  border: 1px solid var(--line); background: rgba(14, 23, 41, 0.9);
  color: var(--text-2); font-size: 12px; cursor: pointer;
  opacity: 0; visibility: hidden; transition: 0.3s;
  backdrop-filter: blur(8px);
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { color: var(--cyan); border-color: rgba(34, 211, 238, 0.5); }

/* ---------------- 入场动画 ---------------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 46px; }
  .plans { grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .steps, .quote-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .step .step-arrow { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed; top: 74px; left: 0; right: 0;
    background: rgba(6, 9, 15, 0.98); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height 0.35s var(--ease);
  }
  .main-nav.open { max-height: 420px; }
  .main-nav > ul { flex-direction: column; padding: 12px 5%; gap: 4px; }
  .main-nav > ul > li > a { padding: 12px 14px; font-size: 15.5px; }
  .link-login { display: none; }
  .header-actions { margin-left: auto; }
  .top-strip .container { height: auto; padding: 8px 0; font-size: 12px; }
  .top-strip .links { display: none; }
}

@media (max-width: 680px) {
  .section { padding: 64px 0; }
  .hero { padding: 64px 0 76px; }
  .feature-grid, .steps, .quote-grid, .news-grid, .plans, .scene-grid, .spec-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); row-gap: 30px; }
  .form-row { grid-template-columns: 1fr; }
  .cta-band { padding: 44px 22px; }
  .hero-meta { gap: 22px; }
  .hero-meta div strong { font-size: 22px; }
  .footer-top { grid-template-columns: 1fr; }
  .panel-metric b { font-size: 34px; }
}