/* ============================================================
   Fonriv 源流 · 官网设计系统 v2
   深色主题(与产品一致) · 零外部依赖 · 单文件
   ============================================================ */

:root {
  --bg0: #070b11;          /* 页面底 */
  --bg1: #0a1019;          /* 区块底 */
  --bg2: #0d141f;          /* 交替区块底 */
  --card: rgba(148, 183, 214, .045);
  --card-hover: rgba(148, 183, 214, .08);
  --border: rgba(148, 183, 214, .13);
  --border-strong: rgba(148, 183, 214, .22);
  --text: #e9eff7;
  --dim: #92a4b8;
  --dim2: #6b7f94;
  --brand1: #38bdf8;
  --brand2: #2dd4bf;
  --grad: linear-gradient(120deg, #38bdf8 10%, #2dd4bf 90%);
  --ok: #34d399;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --radius: 14px;
  --shadow: 0 18px 50px -18px rgba(2, 8, 20, .85);
  color-scheme: dark;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  background: var(--bg0);
  color: var(--text);
  font-size: 15.5px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--brand1); text-decoration: none; }
a:hover { color: var(--brand2); }
::selection { background: rgba(56, 189, 248, .32); }

.container { max-width: 1180px; margin: 0 auto; padding: 0 26px; }
section { padding: 76px 0; }
.center { text-align: center; }

/* ---------- 通用图标 ---------- */
.ic {
  width: 22px; height: 22px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 90;
  background: rgba(7, 11, 17, .78);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-wrap { display: flex; align-items: center; gap: 22px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); margin-right: auto; }
.brand:hover { color: var(--text); }
.brand .logo { border-radius: 50%; box-shadow: 0 0 22px rgba(45, 212, 191, .28); }
.brand-name { font-size: 18.5px; font-weight: 800; letter-spacing: .02em; }
.brand-name .cn {
  margin-left: 7px; padding: 2px 8px;
  font-size: 12px; font-weight: 600; color: #06202b;
  background: var(--grad); border-radius: 999px; vertical-align: 2px;
}
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 7px 12px; border-radius: 9px;
  color: var(--dim); font-size: 14px; font-weight: 500;
  transition: color .18s, background .18s;
}
.nav a:hover { color: var(--text); background: rgba(148, 183, 214, .07); }
.nav a.active { color: var(--text); background: rgba(56, 189, 248, .12); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
  display: none; width: 38px; height: 38px;
  background: none; border: 1px solid var(--border); border-radius: 9px;
  color: var(--text); font-size: 17px; cursor: pointer;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 11px; border: 1px solid transparent;
  font-size: 14.5px; font-weight: 600; line-height: 1.3; cursor: pointer;
  transition: transform .16s, box-shadow .16s, background .16s, border-color .16s;
  white-space: nowrap;
}
.btn .ic { width: 17px; height: 17px; }
.btn-primary {
  color: #06131c; background: var(--grad);
  box-shadow: 0 8px 26px -8px rgba(45, 212, 191, .55);
}
.btn-primary:hover { color: #06131c; transform: translateY(-2px); box-shadow: 0 12px 32px -8px rgba(56, 189, 248, .6); }
.btn-ghost {
  color: var(--text); background: rgba(148, 183, 214, .06); border-color: var(--border-strong);
}
.btn-ghost:hover { color: var(--text); background: rgba(148, 183, 214, .12); border-color: rgba(56, 189, 248, .45); transform: translateY(-2px); }
.btn-lg { padding: 14px 30px; font-size: 15.5px; border-radius: 13px; }
.btn-sm { padding: 8px 16px; font-size: 13.5px; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 92px 0 84px;
  background:
    radial-gradient(880px 460px at 82% -10%, rgba(56, 189, 248, .13), transparent 60%),
    radial-gradient(720px 420px at 8% 108%, rgba(45, 212, 191, .11), transparent 60%),
    var(--bg0);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 183, 214, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 183, 214, .05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(720px 460px at 60% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(720px 460px at 60% 30%, #000 30%, transparent 75%);
}
.hero-wrap {
  position: relative; display: grid; grid-template-columns: 1.06fr .94fr;
  gap: 56px; align-items: center;
}
.hero h1 {
  font-size: clamp(34px, 4.6vw, 54px); line-height: 1.18; font-weight: 800;
  letter-spacing: .01em; margin: 18px 0 20px;
}
.grad-text {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.lead { font-size: 16.5px; color: var(--dim); max-width: 560px; }
.lead b, .lead strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero-note { margin-top: 22px; font-size: 13px; color: var(--dim); }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; font-size: 13px; font-weight: 600; color: var(--dim);
  background: rgba(148, 183, 214, .07); border: 1px solid var(--border);
  border-radius: 999px;
}
.badge .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 10px var(--ok); animation: pulse 2.4s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

/* 浏览器 mock */
.mock-wrap { position: relative; }
.mock {
  background: linear-gradient(180deg, #0e1622, #0b121d);
  border: 1px solid var(--border-strong); border-radius: 16px;
  box-shadow: var(--shadow), 0 0 0 1px rgba(56, 189, 248, .06), 0 30px 80px -30px rgba(45, 212, 191, .22);
  overflow: hidden; font-size: 13px;
}
.mock-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; border-bottom: 1px solid var(--border);
  background: rgba(148, 183, 214, .04);
}
.mock-bar i { width: 10px; height: 10px; border-radius: 50%; background: rgba(148, 183, 214, .25); }
.mock-bar i:first-child { background: #f87171; }
.mock-bar i:nth-child(2) { background: #fbbf24; }
.mock-bar i:nth-child(3) { background: #34d399; }
.mock-bar span {
  margin-left: 10px; padding: 3px 14px; border-radius: 7px;
  background: rgba(7, 11, 17, .8); border: 1px solid var(--border);
  color: var(--dim2); font-family: var(--mono); font-size: 11.5px;
}
.mock-body { display: grid; grid-template-columns: 176px 1fr; min-height: 320px; }
.mock-side { border-right: 1px solid var(--border); padding: 12px 10px; }
.mock-side b {
  display: block; padding: 4px 10px 10px; font-size: 11px; color: var(--dim2);
  letter-spacing: .12em;
}
.mock-side i {
  display: flex; align-items: center; gap: 9px;
  padding: 7px 10px; border-radius: 8px; font-style: normal; color: var(--dim);
}
.mock-side i .ic { width: 15px; height: 15px; }
.mock-side i.on {
  color: var(--text); background: rgba(56, 189, 248, .13);
  box-shadow: inset 2px 0 0 var(--brand1);
}
.mock-main { padding: 14px; }
.mock-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 12px; }
.mock-cards > div {
  padding: 10px 12px; border-radius: 10px;
  background: var(--card); border: 1px solid var(--border);
}
.mock-cards b { display: block; font-size: 16.5px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.mock-cards span { font-size: 11px; color: var(--dim2); }
.mock-panel { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.mock-row {
  display: flex; align-items: center; gap: 10px; padding: 8.5px 12px;
  border-bottom: 1px solid var(--border); color: var(--dim);
}
.mock-row:last-of-type { border-bottom: none; }
.mock-row .ic { width: 15px; height: 15px; color: var(--brand2); }
.mock-row .grow { flex: 1; }
.pill {
  padding: 2px 10px; border-radius: 999px; font-size: 11px; font-weight: 600;
}
.pill.ok { color: var(--ok); background: rgba(52, 211, 153, .12); }
.pill.run { color: var(--brand1); background: rgba(56, 189, 248, .13); }
.mock-bars { display: flex; align-items: flex-end; gap: 6px; height: 56px; padding: 10px 12px; }
.mock-bars i {
  flex: 1; border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, rgba(56, 189, 248, .75), rgba(45, 212, 191, .25));
  animation: barGrow 1.2s ease both;
}
@keyframes barGrow { from { transform: scaleY(.25); transform-origin: bottom; } to { transform: scaleY(1); } }
.float-tag {
  position: absolute; z-index: 2;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 15px; font-size: 12.5px; font-weight: 600;
  color: var(--text); background: rgba(13, 20, 31, .92);
  border: 1px solid var(--border-strong); border-radius: 11px;
  box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.float-tag .ic { width: 15px; height: 15px; color: var(--brand2); }

/* ---------- 信任条 ---------- */
.trustbar { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg1); }
.trustbar .container {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; padding-top: 22px; padding-bottom: 22px;
}
.trustbar > .container > div { text-align: center; }
.trustbar b { display: block; font-size: 22px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.trustbar span { font-size: 12.5px; color: var(--dim2); }

/* ---------- 区块标题 ---------- */
.section-head { max-width: 720px; margin: 0 auto 44px; text-align: center; }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; font-weight: 600;
  letter-spacing: .22em; text-transform: uppercase; color: var(--brand1);
}
.kicker::before, .kicker::after { content: ""; width: 22px; height: 1px; background: linear-gradient(90deg, transparent, var(--brand1)); }
.kicker::after { background: linear-gradient(90deg, var(--brand1), transparent); }
.section-head h2 { font-size: clamp(25px, 3vw, 33px); font-weight: 800; margin: 12px 0 12px; line-height: 1.3; }
.section-head p { color: var(--dim); font-size: 15px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  position: relative;
  padding: 26px 26px 24px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border);
  transition: transform .2s, border-color .2s, background .2s, box-shadow .2s;
}
.card:hover {
  transform: translateY(-4px); border-color: rgba(56, 189, 248, .38);
  background: var(--card-hover);
  box-shadow: 0 18px 44px -20px rgba(2, 8, 20, .9), 0 0 0 1px rgba(56, 189, 248, .08);
}
.card h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 9px; }
.card p { font-size: 14px; color: var(--dim); }
.card .ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; margin-bottom: 16px; border-radius: 12px;
  color: var(--brand1); background: rgba(56, 189, 248, .1);
  border: 1px solid rgba(56, 189, 248, .22);
}
.card .ico .ic { width: 22px; height: 22px; }
.more { display: inline-flex; align-items: center; gap: 6px; margin-top: 14px; font-size: 13.5px; font-weight: 600; }
.more .ic { width: 14px; height: 14px; transition: transform .16s; }
.more:hover .ic { transform: translateX(4px); }

/* ---------- 版本徽标 ---------- */
.ed-tag {
  display: inline-block; padding: 2px 10px; margin-left: 2px;
  font-size: 11.5px; font-weight: 700; border-radius: 999px; vertical-align: 2px;
}
.ed-free { color: var(--ok); background: rgba(52, 211, 153, .1); border: 1px solid rgba(52, 211, 153, .3); }
.ed-pro { color: var(--brand1); background: rgba(56, 189, 248, .12); border: 1px solid rgba(56, 189, 248, .35); }

/* ---------- 协议墙 ---------- */
.proto-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.proto {
  display: flex; align-items: center; gap: 13px;
  padding: 17px 18px; border-radius: 12px;
  background: var(--card); border: 1px solid var(--border);
  transition: transform .18s, border-color .18s;
}
.proto:hover { transform: translateY(-3px); border-color: rgba(45, 212, 191, .4); }
.p-ico {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 38px; height: 38px; border-radius: 10px;
  color: var(--brand2); background: rgba(45, 212, 191, .09); border: 1px solid rgba(45, 212, 191, .22);
}
.p-ico .ic { width: 19px; height: 19px; }
.proto b { display: block; font-size: 14.5px; }
.proto span { font-size: 12px; color: var(--dim2); }

/* ---------- 版本卡片 ---------- */
.plan {
  position: relative; display: flex; flex-direction: column;
  padding: 30px; border-radius: 18px;
  background: var(--card); border: 1px solid var(--border);
}
.plan.hot {
  border-color: rgba(56, 189, 248, .45);
  background: linear-gradient(180deg, rgba(56, 189, 248, .07), rgba(45, 212, 191, .03) 55%), var(--card);
  box-shadow: 0 22px 60px -24px rgba(56, 189, 248, .28);
}
.plan.hot::before {
  content: "推荐"; position: absolute; top: -11px; right: 22px;
  padding: 3px 13px; font-size: 11.5px; font-weight: 700; color: #06131c;
  background: var(--grad); border-radius: 999px;
}
.plan-name { font-size: 17px; font-weight: 800; }
.price { font-size: 30px; font-weight: 800; margin: 14px 0 4px; }
.price small { font-size: 13px; font-weight: 500; color: var(--dim2); }
.plan-desc { font-size: 13.5px; color: var(--dim); margin-bottom: 18px; }
.plan ul { list-style: none; margin-bottom: 24px; }
.plan li {
  position: relative; padding: 6px 0 6px 27px;
  font-size: 14px; color: var(--dim);
}
.plan li::before {
  content: ""; position: absolute; left: 2px; top: 13px;
  width: 14px; height: 14px; border-radius: 50%;
  background: rgba(52, 211, 153, .14) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2334d399' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 12l5 5L20 7'/%3E%3C/svg%3E") center/10px no-repeat;
  border: 1px solid rgba(52, 211, 153, .3);
}
.plan li b { color: var(--text); font-weight: 600; }
.coming {
  margin-top: 30px; padding: 15px 22px; text-align: center;
  font-size: 13.5px; color: var(--dim);
  background: var(--card); border: 1px dashed var(--border-strong); border-radius: 12px;
}

/* ---------- 对比表 ---------- */
.cmp-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
.cmp { width: 100%; border-collapse: collapse; background: var(--card); min-width: 620px; }
.cmp th, .cmp td { padding: 12px 18px; font-size: 14px; text-align: left; border-bottom: 1px solid var(--border); }
.cmp thead th { background: rgba(148, 183, 214, .05); font-size: 13px; letter-spacing: .04em; color: var(--dim); }
.cmp td:not(:first-child) { color: var(--dim); }
.cmp tr.group td {
  padding: 8px 18px; font-size: 12.5px; font-weight: 700; color: var(--brand2);
  letter-spacing: .1em; background: rgba(45, 212, 191, .05);
}
.cmp .yes { color: var(--ok); font-weight: 600; }
.cmp .no { color: var(--dim2); }
.cmp tbody tr:hover td { background: rgba(148, 183, 214, .035); }

/* ---------- 步骤 / 代码 ---------- */
.steps { display: grid; gap: 18px; }
.step h3 { font-size: 15.5px; margin-bottom: 10px; display: flex; align-items: center; gap: 9px; }
.step h3 .ic { width: 18px; height: 18px; color: var(--brand2); }
.step p { font-size: 14px; color: var(--dim); }
.code {
  padding: 16px 18px; border-radius: 12px; overflow-x: auto;
  background: #0a0f17; border: 1px solid var(--border);
  font-family: var(--mono); font-size: 13px; line-height: 1.85; color: #c7d5e4;
  white-space: pre;
}
.code .c { color: #5a6f84; }
.code .k { color: var(--brand2); }
.code-head {
  display: flex; justify-content: space-between; gap: 10px;
  padding: 8px 16px; border: 1px solid var(--border); border-bottom: none;
  border-radius: 12px 12px 0 0; background: rgba(148, 183, 214, .05);
  font-family: var(--mono); font-size: 11.5px; color: var(--dim2);
}
.code-head + .code { border-radius: 0 0 12px 12px; }

/* ---------- 功能页行式列表 ---------- */
.feat-row {
  display: grid; grid-template-columns: 300px 1fr; gap: 30px;
  padding: 30px 0; border-bottom: 1px solid var(--border);
}
.feat-row h3 { font-size: 17.5px; font-weight: 800; display: flex; align-items: center; gap: 10px; }
.feat-row h3 .ic { width: 21px; height: 21px; color: var(--brand1); }
.fdesc { margin-top: 9px; font-size: 13.5px; color: var(--dim2); }
.feat-list { list-style: none; }
.feat-list li {
  padding: 9px 0; font-size: 14.2px; color: var(--dim);
  border-bottom: 1px dashed rgba(148, 183, 214, .09);
}
.feat-list li:last-child { border-bottom: none; }
.feat-list b { color: var(--text); font-weight: 650; margin-right: 4px; }

/* ---------- 安全页 ---------- */
.sec-group { margin-bottom: 40px; }
.sec-group h3 { font-size: 17px; font-weight: 800; margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.sec-group h3 .ic { width: 20px; height: 20px; color: var(--brand2); }
.sec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.sec-item {
  padding: 15px 17px; font-size: 13.5px; color: var(--dim);
  background: var(--card); border: 1px solid var(--border); border-radius: 11px;
  transition: border-color .18s;
}
.sec-item:hover { border-color: rgba(45, 212, 191, .35); }
.sec-item b { display: block; color: var(--text); font-size: 14px; margin-bottom: 4px; }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 10px; }
.faq details {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  transition: border-color .18s;
}
.faq details[open] { border-color: rgba(56, 189, 248, .35); }
.faq summary {
  list-style: none; cursor: pointer; padding: 15px 20px;
  font-size: 14.5px; font-weight: 650;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-size: 19px; font-weight: 400; color: var(--brand1);
  transition: transform .18s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq-a { padding: 0 20px 17px; font-size: 14px; color: var(--dim); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden; text-align: center;
  padding: 56px 40px; border-radius: 22px;
  background:
    radial-gradient(480px 220px at 50% -40%, rgba(56, 189, 248, .16), transparent 70%),
    linear-gradient(180deg, rgba(56, 189, 248, .05), rgba(45, 212, 191, .03)), var(--bg1);
  border: 1px solid var(--border-strong);
}
.cta-band h2 { font-size: clamp(23px, 2.8vw, 30px); font-weight: 800; margin-bottom: 12px; }
.cta-band p { color: var(--dim); max-width: 640px; margin: 0 auto 26px; font-size: 15px; }

/* ---------- 页面 Hero ---------- */
.page-hero {
  position: relative; padding: 60px 0 46px;
  background:
    radial-gradient(760px 300px at 18% -30%, rgba(56, 189, 248, .1), transparent 65%),
    var(--bg0);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(28px, 3.6vw, 40px); font-weight: 800; margin: 12px 0 12px; }
.page-hero p { color: var(--dim); max-width: 780px; font-size: 15px; }
.crumb { font-size: 12.5px; color: var(--dim2); }
.crumb a { color: var(--dim2); }
.crumb a:hover { color: var(--brand1); }

/* ---------- 许可协议 ---------- */
.license {
  padding: 34px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border);
}
.license pre {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.9;
  color: var(--dim); white-space: pre-wrap; word-break: break-word;
}

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg1); padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 44px; }
.footer-brand p { margin-top: 14px; font-size: 13.5px; color: var(--dim2); max-width: 300px; }
.site-footer h4 { font-size: 13px; letter-spacing: .1em; color: var(--dim); margin-bottom: 14px; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 9px; }
.site-footer li a { font-size: 13.5px; color: var(--dim2); transition: color .15s; }
.site-footer li a:hover { color: var(--brand1); }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: space-between;
  padding: 18px 0 26px; border-top: 1px solid var(--border);
  font-size: 12.5px; color: var(--dim2);
}

/* ---------- 入场动效 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .mock-bars i, .badge .dot { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-wrap { grid-template-columns: 1fr; gap: 44px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .proto-grid { grid-template-columns: repeat(3, 1fr); }
  .sec-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  section { padding: 56px 0; }
  .nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 12px 20px 16px; background: rgba(7, 11, 17, .97);
    border-bottom: 1px solid var(--border);
  }
  .nav.open { display: flex; }
  .nav a { padding: 11px 12px; }
  .nav-toggle { display: block; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .proto-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-row { grid-template-columns: 1fr; gap: 14px; }
  .trustbar .container { grid-template-columns: repeat(3, 1fr); row-gap: 18px; }
  .float-tag { display: none; }
  .sec-grid { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  body { font-size: 14.5px; }
  .container { padding: 0 18px; }
  .proto-grid { grid-template-columns: 1fr 1fr; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-side { display: none; }
  .hero-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
}