/* ==========================================================
   xmt.asia 站点样式  v2
   ========================================================== */

:root {
  --brand: #1a56db;
  --brand-deep: #0f2f6b;
  --accent: #0d9488;
  --warm: #d97706;
  --danger: #dc2626;

  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #eef3fa;
  --text: #142434;
  --text-2: #4a5b6d;
  --text-3: #7b8b9c;
  --line: #e3eaf3;

  --hero-1: #0b2545;
  --hero-2: #13386f;
  --hero-3: #0b5d55;

  --shadow-s: 0 1px 2px rgba(16, 32, 56, .06), 0 2px 8px rgba(16, 32, 56, .05);
  --shadow-m: 0 4px 12px rgba(16, 32, 56, .08), 0 12px 32px rgba(16, 32, 56, .07);
  --shadow-l: 0 8px 24px rgba(16, 32, 56, .10), 0 24px 64px rgba(16, 32, 56, .10);

  --r-s: 10px;
  --r-m: 16px;
  --r-l: 22px;

  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC",
          system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --maxw: 1160px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1420;
    --surface: #131e2c;
    --surface-2: #1a2636;
    --text: #e8eef5;
    --text-2: #a9bacb;
    --text-3: #74879a;
    --line: #23303f;

    --hero-1: #07182e;
    --hero-2: #0d2a52;
    --hero-3: #0a4436;

    --shadow-s: 0 1px 2px rgba(0, 0, 0, .30);
    --shadow-m: 0 4px 14px rgba(0, 0, 0, .35);
    --shadow-l: 0 10px 30px rgba(0, 0, 0, .45);
    --brand: #5b93ff;
    --accent: #2dd4bf;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--accent); }
code, kbd { font-family: var(--mono); }

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

/* ---------- 顶部导航 ---------- */

.navbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--surface-2);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s ease, border-color .25s ease;
}
.navbar.scrolled { box-shadow: var(--shadow-s); }

.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 68px; display: flex; align-items: center; gap: 28px;
}

.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 17px; color: var(--text); flex: none; }
.brand:hover { color: var(--text); }
.brand img { width: 32px; height: 32px; }
.brand small { display: block; font-size: 11px; font-weight: 400; color: var(--text-3); line-height: 1.1; letter-spacing: .06em; }

.nav-links { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.nav-links a {
  padding: 8px 14px; border-radius: 8px; font-size: 15px;
  color: var(--text-2); font-weight: 500; position: relative;
}
.nav-links a:hover { color: var(--brand); background: var(--surface-2); text-decoration: none; }
.nav-links a.active { color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, transparent); }

.nav-cta {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff !important; padding: 9px 18px !important; border-radius: 999px;
  font-weight: 600; box-shadow: 0 4px 14px color-mix(in srgb, var(--brand) 40%, transparent);
}
.nav-cta:hover { filter: brightness(1.08); background: linear-gradient(135deg, var(--brand), var(--accent)); }

.burger { display: none; margin-left: auto; background: none; border: 1px solid var(--line);
  border-radius: 10px; width: 42px; height: 38px; cursor: pointer; padding: 0; color: var(--text); }
.burger span { display: block; width: 18px; height: 2px; background: currentColor; margin: 4px auto; border-radius: 2px; transition: .25s; }

.read-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--brand), var(--accent)); z-index: 60; transition: width .1s linear; }

/* ---------- Hero ---------- */

.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(140deg, var(--hero-1) 0%, var(--hero-2) 52%, var(--hero-3) 100%);
  color: #eaf1f8;
  padding: 76px 0 92px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(900px 480px at 12% -8%, rgba(96, 165, 250, .30), transparent 62%),
    radial-gradient(760px 420px at 92% 8%, rgba(45, 212, 191, .22), transparent 60%);
  pointer-events: none;
}
.hero-grid {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px; position: relative;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.hero h1 { font-size: clamp(30px, 4.2vw, 46px); line-height: 1.28; margin: 14px 0 18px; letter-spacing: -.5px; color: #fff; }
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; letter-spacing: .08em;
  background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .20);
  padding: 5px 14px; border-radius: 999px; color: #cfe4ff;
}
.hero p.lead { font-size: 17px; color: #c3d6ea; max-width: 52ch; margin: 0 0 30px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 24px; border-radius: 12px; font-weight: 600; font-size: 15.5px;
  border: 1px solid transparent; cursor: pointer; transition: transform .18s ease, box-shadow .18s ease, filter .18s ease;
}
.btn:hover { transform: translateY(-2px); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn-primary { background: #fff; color: var(--hero-2); box-shadow: 0 10px 26px rgba(0, 0, 0, .22); }
.btn-primary:hover { color: var(--hero-2); }
.btn-ghost { border-color: rgba(255, 255, 255, .42); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.btn-brand { background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff;
  box-shadow: 0 8px 22px color-mix(in srgb, var(--brand) 35%, transparent); }
.btn-brand:hover { color: #fff; }
.btn-outline { border-color: var(--line); color: var(--text); background: var(--surface); }
.btn-outline:hover { border-color: var(--brand); color: var(--brand); }
.btn-sm { padding: 8px 16px; font-size: 14px; border-radius: 10px; }

.hero-meta { display: flex; flex-wrap: wrap; gap: 26px; font-size: 14px; color: #a8c2dc; }
.hero-meta b { display: block; font-size: 21px; color: #fff; font-weight: 700; letter-spacing: -.3px; }

/* 浮动的界面示意图（纯 CSS/SVG） */
.hero-art { position: relative; }
.mock {
  background: var(--surface); border-radius: var(--r-l); overflow: hidden;
  box-shadow: var(--shadow-l); border: 1px solid rgba(255, 255, 255, .22);
  transform: perspective(1400px) rotateY(-9deg) rotateX(3deg);
  transition: transform .5s cubic-bezier(.2, .7, .3, 1);
}
.hero-art:hover .mock { transform: perspective(1400px) rotateY(0) rotateX(0); }
.mock-bar { display: flex; align-items: center; gap: 6px; padding: 11px 14px; background: var(--surface-2); border-bottom: 1px solid var(--line); }
.mock-bar i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.mock-bar .url { margin-left: 10px; flex: 1; height: 20px; border-radius: 6px; background: var(--surface); border: 1px solid var(--line); }
.mock-body { display: grid; grid-template-columns: 92px 1fr; min-height: 224px; }
.mock-side { background: var(--surface-2); padding: 14px 10px; display: grid; gap: 9px; align-content: start; }
.mock-side span { display: block; height: 22px; border-radius: 7px; background: color-mix(in srgb, var(--brand) 16%, transparent); }
.mock-side span:nth-child(2), .mock-side span:nth-child(3), .mock-side span:nth-child(4),
.mock-side span:nth-child(5) { background: transparent; border: 1px dashed var(--line); }
.mock-main { padding: 14px; display: grid; gap: 10px; align-content: start; background: var(--surface); }
.mock-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.mock-kpis div { border: 1px solid var(--line); border-radius: 10px; padding: 10px; }
.mock-kpis b { display: block; height: 8px; width: 46%; border-radius: 4px; background: var(--brand); opacity: .55; margin-bottom: 7px; }
.mock-kpis i { display: block; height: 18px; border-radius: 5px; background: var(--surface-2); }
.mock-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mock-row i { display: block; height: 12px; border-radius: 5px; background: var(--surface-2); }
.mock-table { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.mock-table i { display: block; height: 13px; background: var(--surface-2); margin: 7px; border-radius: 4px; }

.float-card {
  position: absolute; background: var(--surface); border-radius: 14px; box-shadow: var(--shadow-m);
  border: 1px solid var(--line); padding: 11px 15px; font-size: 13px; color: var(--text);
  display: flex; align-items: center; gap: 9px; animation: bob 4.5s ease-in-out infinite;
}
.float-card b { font-size: 15px; }
.float-a { left: -14px; bottom: 26px; }
.float-b { right: -10px; top: 22px; animation-delay: 1.2s; }
.float-chip { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: 15px; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }

/* ---------- 通用区块 ---------- */

.section { padding: 76px 0; }
.section.soft { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section.deep { background: linear-gradient(180deg, var(--surface-2), var(--bg)); }

.sec-head { max-width: 720px; margin: 0 auto 44px; text-align: center; }
.sec-head h2 { font-size: clamp(24px, 3vw, 33px); margin: 0 0 12px; letter-spacing: -.4px; }
.sec-head p { color: var(--text-2); margin: 0; font-size: 16.5px; }
.sec-tag { display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .1em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 10px; }

/* 系统大卡 */
.sys-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.sys-card {
  position: relative; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-l);
  padding: 30px 30px 26px; box-shadow: var(--shadow-s);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; overflow: hidden;
}
.sys-card::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 4px;
  background: linear-gradient(90deg, var(--card-c1, var(--brand)), var(--card-c2, var(--accent)));
}
.sys-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-l); border-color: color-mix(in srgb, var(--brand) 32%, var(--line)); }
.sys-top { display: flex; align-items: flex-start; gap: 15px; margin-bottom: 14px; }
.sys-ico { width: 52px; height: 52px; border-radius: 15px; display: grid; place-items: center; font-size: 25px; flex: none;
  background: var(--surface-2);
  background: color-mix(in srgb, var(--card-c1, var(--brand)) 13%, transparent); }
.sys-card h3 { margin: 0; font-size: 21px; letter-spacing: -.3px; }
.sys-card h3 small { display: block; font-size: 13px; font-weight: 400; color: var(--text-3); letter-spacing: .04em; margin-top: 2px; }
.sys-badge { margin-left: auto; font-size: 12px; font-weight: 600; padding: 4px 11px; border-radius: 999px;
  background: var(--surface-2);
  background: color-mix(in srgb, var(--card-c1, var(--brand)) 12%, transparent);
  color: var(--card-c1, var(--brand)); white-space: nowrap; }
.sys-desc { color: var(--text-2); margin: 0 0 16px; font-size: 15.5px; }

.feat-list { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 9px; flex: 1; }
.feat-list li { position: relative; padding-left: 26px; font-size: 15px; color: var(--text-2); }
.feat-list li::before {
  content: ""; position: absolute; left: 0; top: 9px; width: 15px; height: 15px; border-radius: 50%;
  background: var(--surface-2);
  background: color-mix(in srgb, var(--accent) 18%, transparent);
}
.feat-list li::after {
  content: ""; position: absolute; left: 4.5px; top: 13px; width: 6px; height: 3px;
  border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.tag { font-size: 12.5px; padding: 4px 11px; border-radius: 7px; background: var(--surface-2); color: var(--text-2); border: 1px solid var(--line); }
.sys-foot { display: flex; gap: 11px; align-items: center; flex-wrap: wrap; padding-top: 18px; border-top: 1px dashed var(--line); }

/* 亮条 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: -38px; position: relative; z-index: 3; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-m); padding: 22px 20px;
  box-shadow: var(--shadow-m); text-align: center; }
.stat b { display: block; font-size: 30px; font-weight: 700; letter-spacing: -1px;
  background: linear-gradient(135deg, var(--brand), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { font-size: 13.5px; color: var(--text-3); }

/* 流程/架构 */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin-top: 8px; }
.flow-step { text-align: center; position: relative; padding: 0 8px; }
.flow-step .dot { width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 50%; display: grid; place-items: center;
  font-size: 19px; background: var(--surface); border: 2px solid var(--brand); color: var(--brand);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--brand) 9%, transparent); }
.flow-step h4 { margin: 0 0 6px; font-size: 16px; }
.flow-step p { margin: 0; font-size: 13.5px; color: var(--text-3); line-height: 1.65; }
.flow-step:not(:last-child)::after { content: ""; position: absolute; top: 26px; left: 58%; right: -6%;
  height: 2px; background: repeating-linear-gradient(90deg, var(--line) 0 6px, transparent 6px 12px); }

/* 表格 */
table.data { width: 100%; border-collapse: collapse; margin: 8px 0 26px; font-size: 15px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-m); overflow: hidden; }
table.data th, table.data td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { background: var(--surface-2); font-weight: 600; font-size: 14px; color: var(--text-2); white-space: nowrap; }
table.data tr:last-child td { border-bottom: none; }
table.data tbody tr:hover td { background: color-mix(in srgb, var(--brand) 5%, transparent); }

/* 文档正文 */
.doc { max-width: 860px; margin: 0 auto; padding: 44px 24px 76px; }
.doc h1 { font-size: clamp(26px, 3.4vw, 36px); margin: 6px 0 10px; letter-spacing: -.5px; }
.doc h2 { font-size: 22px; margin: 46px 0 14px; padding-left: 13px; border-left: 4px solid var(--brand); line-height: 1.4; }
.doc h3 { font-size: 17.5px; margin: 28px 0 10px; }
.doc p { color: var(--text-2); }
.doc ul.doc-list { color: var(--text-2); padding-left: 22px; }
.doc ul.doc-list li { margin-bottom: 7px; }
.sub { color: var(--text-3); font-size: 15.5px; margin-bottom: 4px !important; }

.breadcrumb { font-size: 14px; color: var(--text-3); margin-bottom: 18px; }
.breadcrumb a { color: var(--text-3); }
.breadcrumb span { margin: 0 7px; }

/* 提示框 */
.note { border-radius: var(--r-m); padding: 16px 20px; margin: 20px 0; border: 1px solid var(--line);
  background: var(--surface-2); color: var(--text-2); font-size: 15px; }
.note.info { border-left: 4px solid var(--brand); }
.note.warn { border-left: 4px solid var(--warm); background: color-mix(in srgb, var(--warm) 8%, transparent); }
.note.ok   { border-left: 4px solid var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); }
.note b { color: var(--text); }

/* 凭据卡 */
.cred-box { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin: 18px 0; }
.cred-item { background: var(--surface); border: 1px dashed var(--line); border-radius: 12px; padding: 12px 18px; min-width: 168px; }
.cred-item span { display: block; font-size: 12px; color: var(--text-3); letter-spacing: .06em; }
.cred-item code { font-size: 19px; font-weight: 700; color: var(--text); letter-spacing: .5px; }

/* 折叠面板 */
details.faq { border: 1px solid var(--line); border-radius: var(--r-m); background: var(--surface); margin-bottom: 12px; overflow: hidden; }
details.faq summary { cursor: pointer; padding: 15px 20px; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 10px; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::before { content: "+"; width: 22px; height: 22px; border-radius: 6px; background: var(--surface-2);
  color: var(--brand); display: grid; place-items: center; font-weight: 700; flex: none; }
details.faq[open] summary::before { content: "−"; }
details.faq .faq-body { padding: 0 20px 18px; color: var(--text-2); font-size: 15px; border-top: 1px solid var(--line); padding-top: 14px; }

/* 步骤卡 */
.steps { display: grid; gap: 16px; counter-reset: st; }
.step-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-m); padding: 20px 22px 20px 66px;
  position: relative; box-shadow: var(--shadow-s); }
.step-card::before {
  counter-increment: st; content: counter(st);
  position: absolute; left: 20px; top: 20px; width: 32px; height: 32px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff;
  display: grid; place-items: center; font-weight: 700; font-size: 15px;
}
.step-card h3 { margin: 0 0 6px; font-size: 17px; }
.step-card p, .step-card li { color: var(--text-2); font-size: 15px; }
.step-card ul { margin: 8px 0 0; padding-left: 20px; }

/* 可勾选清单 */
.checklist { list-style: none; padding: 0; margin: 14px 0; display: grid; gap: 8px; }
.checklist li { display: flex; align-items: flex-start; gap: 11px; padding: 11px 15px; border: 1px solid var(--line);
  border-radius: 11px; background: var(--surface); cursor: pointer; transition: .18s; font-size: 15px; }
.checklist li:hover { border-color: var(--brand); }
.checklist li input { margin-top: 5px; width: 17px; height: 17px; accent-color: var(--brand); cursor: pointer; flex: none; }
.checklist li.done { color: var(--text-3); }
.checklist li.done label { text-decoration: line-through; }
.checklist label { cursor: pointer; flex: 1; }
.progress-bar { height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; margin: 6px 0 18px; }
.progress-bar i { display: block; height: 100%; width: 0; border-radius: 99px;
  background: linear-gradient(90deg, var(--brand), var(--accent)); transition: width .35s ease; }

/* 代码块 */
pre.code { background: #0f1b2b; color: #d6e4f5; padding: 16px 18px; border-radius: var(--r-m); overflow-x: auto;
  font-size: 13.5px; line-height: 1.7; border: 1px solid #22344c; }
pre.code .c { color: #6b8299; }
pre.code .k { color: #7dd3fc; }
pre.code .s { color: #fbbf24; }
.copy-btn { float: right; background: rgba(255, 255, 255, .10); border: 1px solid rgba(255, 255, 255, .2); color: #cfe0f2;
  border-radius: 8px; padding: 3px 11px; font-size: 12.5px; cursor: pointer; }
.copy-btn:hover { background: rgba(255, 255, 255, .2); color: #fff; }

/* 关于 / 时间线 */
.timeline { border-left: 2px solid var(--line); margin-left: 12px; padding-left: 26px; }
.timeline li { list-style: none; position: relative; padding-bottom: 24px; }
.timeline li::before { content: ""; position: absolute; left: -33px; top: 8px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--surface-2);
  background: var(--brand); box-shadow: 0 0 0 4px color-mix(in srgb, var(--brand) 15%, transparent); }
.timeline b { display: block; font-size: 16px; }
.timeline span { color: var(--text-3); font-size: 14.5px; }

/* ---------- 页脚 ---------- */
.footer { background: #0b1a2c; color: #93a9c0; padding: 54px 0 30px; font-size: 14.5px; }
@media (prefers-color-scheme: dark) { .footer { background: #08101c; } }
.footer a { color: #c3d5e8; }
.footer a:hover { color: #fff; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 34px; }
.foot-grid h5 { color: #fff; font-size: 15px; margin: 0 0 14px; }
.foot-grid ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.foot-brand b { color: #fff; font-size: 17px; display: flex; align-items: center; gap: 9px; }
.foot-brand img { width: 28px; height: 28px; }
.foot-brand p { margin: 12px 0 0; max-width: 40ch; line-height: 1.75; }
.foot-bottom { margin-top: 34px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .10);
  display: flex; flex-wrap: wrap; gap: 12px 22px; align-items: center; font-size: 13.5px; }
.beian a { display: inline-flex; align-items: center; gap: 6px; }
.beian img { width: 15px; height: 15px; }
.beian .sep { margin: 0 10px; opacity: .4; }

/* 返回顶部 */
#toTop { position: fixed; right: 22px; bottom: 22px; width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line);
  background: var(--surface); color: var(--text-2); cursor: pointer; box-shadow: var(--shadow-m);
  display: grid; place-items: center; opacity: 0; pointer-events: none; transition: .28s; z-index: 40; font-size: 17px; }
#toTop.show { opacity: 1; pointer-events: auto; }
#toTop:hover { color: var(--brand); border-color: var(--brand); transform: translateY(-3px); }

/* 出场动画 */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s cubic-bezier(.2, .7, .3, 1); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 56px 0 68px; }
  .hero-art { max-width: 520px; }
  .sys-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); margin-top: -30px; }
  .flow { grid-template-columns: repeat(2, 1fr); gap: 26px 0; }
  .flow-step:not(:last-child)::after { display: none; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 15.5px; }
  .nav-inner { height: 60px; gap: 12px; }
  .burger { display: block; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 60px;
    background: var(--surface); border-bottom: 1px solid var(--line); flex-direction: column;
    padding: 10px 16px 16px; gap: 2px; box-shadow: var(--shadow-m); align-items: stretch;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-cta { text-align: center; margin-top: 6px; }
  .float-card { display: none; }
  .mock-body { grid-template-columns: 1fr; min-height: 0; }
  .mock-side { grid-auto-flow: column; grid-auto-columns: 1fr; padding: 10px; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat { padding: 16px 12px; }
  .stat b { font-size: 24px; }
  .section { padding: 52px 0; }
  .sys-card { padding: 24px 20px 20px; }
  .foot-grid { grid-template-columns: 1fr; gap: 26px; }
  .foot-bottom { flex-direction: column; align-items: flex-start; }
  table.data { font-size: 14px; }
  table.data th, table.data td { padding: 10px 12px; }
  .step-card { padding: 18px 18px 18px 60px; }
}

@media print {
  .navbar, #toTop, .hero-actions, .read-progress { display: none !important; }
  .hero { background: #fff; color: #000; padding: 20px 0; }
  body { background: #fff; }
}

/* ==========================================================
   补：内页顶部、徽标
   ========================================================== */

/* 内页用小一号 hero */
.hero.page-hero { padding: 52px 0 60px; }
.hero.page-hero::before {
  background-image:
    radial-gradient(720px 340px at 8% -20%, rgba(96, 165, 250, .28), transparent 62%),
    radial-gradient(620px 320px at 96% 0%, rgba(45, 212, 191, .20), transparent 60%);
}
.hero.page-hero h1 { font-size: clamp(26px, 3.6vw, 38px); margin: 12px 0 14px; }
.hero.page-hero p.lead { margin-bottom: 24px; max-width: 62ch; }

/* 徽标 */
.badge {
  display: inline-block; padding: 3px 12px; border-radius: 999px;
  font-size: 13px; font-weight: 600; line-height: 1.7; white-space: nowrap;
}
.badge.ok     { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.badge.warn   { background: color-mix(in srgb, var(--warm) 16%, transparent);   color: var(--warm);   border: 1px solid color-mix(in srgb, var(--warm) 32%, transparent); }
.badge.danger { background: color-mix(in srgb, var(--danger) 16%, transparent); color: var(--danger); border: 1px solid color-mix(in srgb, var(--danger) 32%, transparent); }

.code-wrap { position: relative; margin: 16px 0; }

@media (max-width: 720px) {
  .hero.page-hero { padding: 38px 0 46px; }
  .err-wrap { padding: 60px 20px 70px !important; }
  .err-code { font-size: 76px !important; }
}