/* ==========================================================================
   MT5 中文站 · 全站样式
   设计基调：金融科技 / 深蓝 + 青绿，浅色内容区，卡片式信息层级
   断点：1200 / 980 / 720 / 520
   ========================================================================== */

:root {
  --ink: #0b1a2b;
  --ink-2: #22364d;
  --muted: #5b6b7f;
  --line: #e3e9f2;
  --line-2: #eef2f8;
  --bg: #f6f8fb;
  --card: #ffffff;
  --brand: #1450c8;
  --brand-2: #2a7bff;
  --brand-ink: #0d2f74;
  --accent: #00b39a;
  --accent-soft: #e6faf6;
  --warn: #b4590a;
  --warn-soft: #fff5e6;
  --navy: #071426;
  --navy-2: #0c2444;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(11, 26, 43, .06), 0 2px 8px rgba(11, 26, 43, .05);
  --shadow: 0 8px 24px rgba(11, 26, 43, .08);
  --shadow-lg: 0 18px 48px rgba(11, 26, 43, .14);
  --wrap: 1180px;
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-2); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
li { margin: .35em 0; }
strong, b { color: var(--ink); font-weight: 600; }
code {
  font-family: var(--mono);
  font-size: .9em;
  background: #eef2f8;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: .1em .38em;
  word-break: break-all;
}
hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }

h1, h2, h3, h4 {
  color: var(--ink);
  line-height: 1.32;
  letter-spacing: -.01em;
  margin: 0 0 .6em;
  font-weight: 700;
}
h1 { font-size: clamp(1.85rem, 4.2vw, 2.9rem); }
h2 { font-size: clamp(1.4rem, 2.8vw, 2rem); }
h3 { font-size: clamp(1.1rem, 1.9vw, 1.28rem); }
h4 { font-size: 1.02rem; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: 12px; top: -60px; z-index: 999;
  background: #fff; color: var(--ink); padding: 10px 16px; border-radius: 8px;
  box-shadow: var(--shadow); transition: top .2s;
}
.skip:focus { top: 12px; }

/* ---------- 顶部公告条 ---------- */
.topbar {
  background: var(--navy);
  color: #a9bcd6;
  font-size: .82rem;
  letter-spacing: .01em;
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 38px; flex-wrap: wrap;
}
.topbar strong { color: #fff; font-weight: 600; }
.topbar a { color: #cfe0f7; }
.topbar a:hover { color: #fff; }
.topbar .dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); margin-right: 7px; vertical-align: 1px;
}

/* ---------- 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s, background .25s;
}
.site-header.is-stuck { box-shadow: 0 6px 22px rgba(11, 26, 43, .09); background: rgba(255, 255, 255, .98); }
.nav {
  display: flex; align-items: center; gap: 26px;
  min-height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(145deg, var(--brand) 0%, #0a2f7a 100%);
  display: grid; place-items: center;
  box-shadow: 0 4px 12px rgba(20, 80, 200, .28);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-text { display: flex; flex-direction: column; gap: 1px; line-height: 1.25; }
.brand-name { font-weight: 700; font-size: 1.04rem; color: var(--ink); letter-spacing: -.01em; }
.brand-sub { font-size: .68rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--ink-2); font-size: .93rem; font-weight: 500;
  padding: 9px 13px; border-radius: 9px; transition: background .18s, color .18s;
  white-space: nowrap;
}
.nav-links a:hover { background: #f0f4fa; color: var(--brand); }
.nav-links a[aria-current="page"] { color: var(--brand); background: #eaf1ff; font-weight: 600; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-size: .95rem; font-weight: 600; line-height: 1;
  padding: 13px 22px; border-radius: 11px; border: 1px solid transparent;
  cursor: pointer; transition: transform .16s, box-shadow .18s, background .18s, color .18s;
  text-align: center;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--brand-2), var(--brand));
  color: #fff; box-shadow: 0 6px 18px rgba(20, 80, 200, .28);
}
.btn-primary:hover { color: #fff; box-shadow: 0 10px 26px rgba(20, 80, 200, .34); }
.btn-ghost {
  background: #fff; color: var(--ink); border-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover { color: var(--brand); border-color: #c9d8f0; background: #fbfdff; }
.btn-on-dark {
  background: rgba(255, 255, 255, .1); color: #fff; border-color: rgba(255, 255, 255, .28);
}
.btn-on-dark:hover { background: rgba(255, 255, 255, .18); color: #fff; }
.btn-sm { padding: 10px 16px; font-size: .875rem; border-radius: 9px; }
.btn-lg { padding: 16px 30px; font-size: 1.02rem; }
.nav-cta { margin-left: 8px; }

.nav-toggle {
  display: none; margin-left: auto; width: 42px; height: 42px;
  border: 1px solid var(--line); background: #fff; border-radius: 10px;
  cursor: pointer; padding: 0; place-items: center;
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; background: var(--ink-2);
  margin: 3.5px auto; border-radius: 2px; transition: transform .22s, opacity .22s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1100px 520px at 12% -12%, rgba(42, 123, 255, .34), transparent 62%),
    radial-gradient(880px 460px at 92% 8%, rgba(0, 179, 154, .22), transparent 60%),
    linear-gradient(165deg, #071426 0%, #0a1e3a 52%, #0b2a4d 100%);
  color: #dbe6f5;
  padding: 74px 0 82px;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(720px 420px at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(720px 420px at 50% 0%, #000 20%, transparent 78%);
}
.hero .wrap { position: relative; z-index: 1; }
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  gap: 52px; align-items: center;
}
.hero h1 { color: #fff; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: #7fd8ff; }
.hero .lede {
  font-size: clamp(1rem, 1.6vw, 1.12rem); color: #b9cbe2; max-width: 40em;
  margin-bottom: 26px;
}
.hero .lede strong { color: #fff; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .8rem; font-weight: 500; letter-spacing: .01em;
  padding: 6px 12px; border-radius: 999px;
  background: rgba(255, 255, 255, .09); color: #d5e4f7;
  border: 1px solid rgba(255, 255, 255, .16);
}
.badge i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: block; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero-actions .note { font-size: .8rem; color: #8fa6c1; }

/* Hero 右侧：下载卡片 */
.dl-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, .98), #f7faff);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .36);
  color: var(--ink);
  border: 1px solid rgba(255, 255, 255, .6);
}
.dl-card h2 { font-size: 1.06rem; margin-bottom: 4px; }
.dl-card .sub { font-size: .82rem; color: var(--muted); margin-bottom: 16px; }
.dl-list { display: grid; gap: 8px; margin-bottom: 16px; }
.dl-item {
  display: flex; align-items: center; gap: 11px;
  padding: 11px 13px; border: 1px solid var(--line); border-radius: 11px;
  background: #fff; color: var(--ink); transition: border-color .18s, box-shadow .18s, transform .18s;
}
.dl-item:hover {
  border-color: #bcd2f5; box-shadow: 0 6px 16px rgba(20, 80, 200, .1);
  transform: translateY(-1px); color: var(--ink);
}
.dl-item svg { width: 20px; height: 20px; flex: none; color: var(--brand); }
.dl-item .t { font-size: .92rem; font-weight: 600; line-height: 1.3; }
.dl-item .m { font-size: .74rem; color: var(--muted); }
.dl-item .go { margin-left: auto; color: #b6c3d6; font-size: 1.1rem; }
.dl-card .tip {
  font-size: .76rem; color: var(--muted); line-height: 1.6;
  border-top: 1px dashed var(--line); padding-top: 12px;
}

/* ---------- 通用区块 ---------- */
.section { padding: 74px 0; }
.section.tight { padding: 54px 0; }
.section.alt { background: #fff; border-block: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-head.center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .78rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: var(--brand); margin-bottom: 12px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--brand); border-radius: 2px; }
.section-head.center .eyebrow::before { display: none; }
.section-head p { color: var(--muted); font-size: 1.02rem; margin-bottom: 0; }

/* TL;DR 速答块：GEO 关键，便于 AI 摘要直接引用 */
.tldr {
  border: 1px solid #d6e4fb; background: linear-gradient(180deg, #f4f8ff, #fff);
  border-radius: var(--radius); padding: 22px 24px; margin: 0 0 34px;
  box-shadow: var(--shadow-sm);
}
.tldr h2, .tldr h3 {
  font-size: .82rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--brand); margin-bottom: 10px; display: flex; align-items: center; gap: 8px;
}
.tldr h2 svg, .tldr h3 svg { width: 15px; height: 15px; }
.tldr p { margin: 0; color: var(--ink-2); font-size: .98rem; }
.tldr p + p { margin-top: .6em; }

.grid { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #d3e0f2; }
.card h3 { margin-bottom: 8px; }
.card p:last-child { margin-bottom: 0; }
.card p { color: var(--muted); font-size: .95rem; }
.card .icon {
  width: 42px; height: 42px; border-radius: 11px; margin-bottom: 16px;
  display: grid; place-items: center;
  background: linear-gradient(160deg, #eaf1ff, #f7fbff);
  border: 1px solid #dbe7fa; color: var(--brand);
}
.card .icon svg { width: 21px; height: 21px; }
.card.accent .icon { background: var(--accent-soft); border-color: #c8f0e8; color: #00917e; }

/* 数据条 */
.stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px; background: var(--line); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
}
.stat { background: #fff; padding: 22px 24px; }
.stat .n { font-size: 1.7rem; font-weight: 700; color: var(--brand-ink); line-height: 1.2; letter-spacing: -.02em; }
.stat .l { font-size: .84rem; color: var(--muted); margin-top: 2px; }

/* 表格 */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-sm); }
table { width: 100%; border-collapse: collapse; font-size: .93rem; min-width: 620px; }
caption { text-align: left; padding: 14px 18px 0; font-size: .82rem; color: var(--muted); }
th, td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line-2); vertical-align: top; }
thead th {
  background: #f2f6fc; color: var(--ink-2); font-weight: 600; font-size: .86rem;
  border-bottom: 1px solid var(--line); white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fafcff; }
td strong { color: var(--ink); }
.yes { color: #0a8f5b; font-weight: 600; }
.no { color: #b03a2e; }

/* 步骤 */
.steps { counter-reset: s; display: grid; gap: 0; }
.step {
  position: relative; padding: 0 0 30px 58px; counter-increment: s;
  border-left: 2px solid var(--line); margin-left: 19px;
}
.step:last-child { border-left-color: transparent; padding-bottom: 0; }
.step::before {
  content: counter(s); position: absolute; left: -21px; top: -4px;
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  background: #fff; border: 2px solid var(--brand); color: var(--brand);
  font-weight: 700; font-size: .95rem;
  box-shadow: 0 0 0 5px #fff;
}
.step h3 { margin-bottom: 6px; font-size: 1.06rem; }
.step p { color: var(--muted); font-size: .95rem; margin-bottom: .5em; }
.step p:last-child { margin-bottom: 0; }

/* 提示框 */
.callout {
  border-radius: var(--radius); padding: 18px 22px; margin: 26px 0;
  border: 1px solid var(--line); background: #fff; font-size: .94rem;
  display: flex; gap: 14px; align-items: flex-start;
}
.callout svg { width: 20px; height: 20px; flex: none; margin-top: 3px; }
.callout p { margin: 0; color: var(--ink-2); }
.callout p + p { margin-top: .5em; }
.callout.warn { background: var(--warn-soft); border-color: #ffe1b8; }
.callout.warn svg { color: var(--warn); }
.callout.info { background: #f3f8ff; border-color: #d8e6fb; }
.callout.info svg { color: var(--brand); }
.callout.ok { background: var(--accent-soft); border-color: #c3efe7; }
.callout.ok svg { color: #00836f; }

/* FAQ 手风琴 */
.faq { display: grid; gap: 12px; }
.faq details {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0 22px; box-shadow: var(--shadow-sm); transition: border-color .18s, box-shadow .18s;
}
.faq details[open] { border-color: #c9dbf7; box-shadow: var(--shadow); }
.faq summary {
  cursor: pointer; list-style: none; padding: 19px 30px 19px 0; position: relative;
  font-weight: 600; font-size: 1rem; color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 2px; top: 50%;
  width: 9px; height: 9px; margin-top: -6px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform .2s; border-radius: 1px;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq .a { padding: 0 0 20px; color: var(--ink-2); font-size: .95rem; border-top: 1px dashed var(--line-2); padding-top: 14px; }
.faq .a p:last-child { margin-bottom: 0; }

/* 目录 / 侧栏 */
.with-aside { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 54px; align-items: start; }
.aside-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow-sm); position: sticky; top: 92px;
}
.aside-card h2 { font-size: .95rem; margin-bottom: 12px; }
.toc { list-style: none; padding: 0; margin: 0; font-size: .9rem; }
.toc li { margin: 0; border-bottom: 1px dashed var(--line-2); }
.toc li:last-child { border-bottom: 0; }
.toc a { display: block; padding: 9px 0; color: var(--ink-2); }
.toc a:hover { color: var(--brand); }
.aside-card .btn { width: 100%; margin-top: 16px; }

/* 面包屑 */
.crumbs { font-size: .84rem; color: var(--muted); padding: 18px 0 0; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; }
.crumbs li { margin: 0; }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: #b9c5d4; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--brand); }
.crumbs [aria-current="page"] { color: var(--ink-2); }

/* 页面头部（内页） */
.page-hero {
  background:
    radial-gradient(760px 320px at 88% -30%, rgba(42, 123, 255, .28), transparent 65%),
    linear-gradient(160deg, #08182c, #0b2444);
  color: #cfdcee; padding: 40px 0 56px;
}
.page-hero h1 { color: #fff; margin-bottom: 14px; }
.page-hero .lede { color: #b3c6de; max-width: 52em; margin-bottom: 0; font-size: 1.01rem; }
.page-hero .crumbs { color: #7f95b1; }
.page-hero .crumbs a { color: #9db4d1; }
.page-hero .crumbs li + li::before { color: #4a6484; }
.page-hero .crumbs [aria-current="page"] { color: #cfdcee; }

/* CTA 横条 */
.cta-band {
  background: linear-gradient(120deg, #0a2a63, #1450c8 55%, #0aa392);
  border-radius: var(--radius-lg); padding: 42px 46px; color: #fff;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.cta-band h2 { color: #fff; margin-bottom: 8px; font-size: clamp(1.25rem, 2.2vw, 1.65rem); }
.cta-band p { color: #d3e2f7; margin: 0; font-size: .95rem; max-width: 46em; }
.cta-band .actions { display: flex; gap: 12px; flex-wrap: wrap; }
.cta-band .btn-ghost { background: #fff; }

/* 作者/更新信息（E-E-A-T） */
.byline {
  display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center;
  font-size: .84rem; color: var(--muted); margin: 22px 0 0;
  border-top: 1px solid var(--line); padding-top: 16px;
}
.byline b { color: var(--ink-2); font-weight: 600; }
.byline .sep { color: #cbd5e2; }

/* 相关链接 */
.related { display: grid; gap: 14px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.related a {
  display: block; background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 18px 20px; color: var(--ink); transition: border-color .18s, box-shadow .18s, transform .18s;
}
.related a:hover { border-color: #c4d7f3; box-shadow: var(--shadow); transform: translateY(-2px); color: var(--brand); }
.related .k { font-size: .74rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }
.related .t { font-weight: 600; font-size: .96rem; margin-top: 3px; }

/* 页脚 */
.site-footer { background: var(--navy); color: #93a8c4; padding: 56px 0 26px; margin-top: 0; font-size: .9rem; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.site-footer h2 { color: #fff; font-size: .88rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 14px; }
.site-footer .brand-name { color: #fff; }
.site-footer .brand-sub { color: #6e86a5; }
.site-footer p { color: #8ea3bf; font-size: .88rem; line-height: 1.75; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .45em 0; }
.site-footer a { color: #a9bcd6; }
.site-footer a:hover { color: #fff; }
.foot-bottom {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .1);
  font-size: .8rem; color: #74899f; display: flex; flex-wrap: wrap; gap: 10px 20px; justify-content: space-between;
}
.foot-bottom .disclaimer { max-width: 62em; }
.foot-bottom strong { color: #b7c9de; }

/* 返回顶部 */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  background: #fff; border: 1px solid var(--line); color: var(--brand);
  box-shadow: var(--shadow); cursor: pointer; display: grid; place-items: center;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .22s, transform .22s, visibility .22s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: .01ms !important; }
}

/* 404 */
.err-wrap { min-height: 62vh; display: grid; place-items: center; text-align: center; padding: 70px 0; }
.err-code { font-size: clamp(4rem, 14vw, 8rem); font-weight: 800; letter-spacing: -.05em; line-height: 1; color: #e2ebf7; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding: 56px 0 64px; }
  .dl-card { max-width: 520px; }
  .with-aside { grid-template-columns: 1fr; gap: 32px; }
  .aside-card { position: static; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .nav-toggle { display: grid; }
  .nav-links {
    position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 10px 16px 18px; box-shadow: 0 18px 30px rgba(11, 26, 43, .1);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 12px; border-radius: 9px; }
  .nav-cta { margin: 8px 0 0; }
  .nav-cta .btn { width: 100%; }
  .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .related { grid-template-columns: 1fr; }
  .cta-band { padding: 32px 26px; }
}
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .section { padding: 52px 0; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .topbar .wrap { justify-content: center; text-align: center; }
  .topbar .tb-right { display: none; }
  .hero { padding: 44px 0 52px; }
  .dl-card { padding: 20px; }
  .card { padding: 22px; }
  .foot-grid { grid-template-columns: 1fr; gap: 26px; }
  .byline { font-size: .8rem; }
  .tldr { padding: 18px; }
}

/* 打印 */
@media print {
  .site-header, .topbar, .site-footer, .to-top, .cta-band { display: none; }
  body { background: #fff; }
}