/* ==========================================================================
   纸飞机中文版下载官网 - 全站样式
   纯 CSS，无外部依赖，首屏关键样式，移动端优先
   ========================================================================== */

:root {
  --brand: #229ed9;
  --brand-2: #1a7fb3;
  --brand-soft: #e8f6fd;
  --ink: #0d1b2a;
  --ink-2: #1e293b;
  --muted: #5b6b7c;
  --line: #e3eaf1;
  --bg: #ffffff;
  --bg-soft: #f6f9fc;
  --ok: #16a34a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(13, 27, 42, .08);
  --shadow-lg: 0 24px 60px rgba(13, 27, 42, .14);
  --wrap: 1160px;
  --header-h: 64px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; vertical-align: middle; }

a { color: var(--brand-2); text-decoration: none; }
a:hover { color: var(--brand); text-decoration: underline; }

h1, h2, h3, h4 {
  color: var(--ink);
  line-height: 1.35;
  margin: 0 0 .6em;
  font-weight: 800;
  letter-spacing: -.01em;
}

h1 { font-size: clamp(1.7rem, 4.4vw, 2.7rem); }
h2 { font-size: clamp(1.35rem, 2.8vw, 1.85rem); }
h3 { font-size: 1.15rem; }
h4 { font-size: 1.02rem; }

p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.1em; padding-left: 1.35em; }
li { margin-bottom: .45em; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.wrap-narrow { max-width: 860px; }
.center { text-align: center; }
.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-link {
  position: absolute; left: 12px; top: -60px; z-index: 999;
  background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 8px;
}
.skip-link:focus { top: 12px; color: #fff; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: var(--header-h);
}
.logo {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 800; font-size: 1.05rem; color: var(--ink); white-space: nowrap;
}
.logo:hover { text-decoration: none; color: var(--ink); }
.logo-mark {
  width: 32px; height: 32px; flex: 0 0 32px; border-radius: 9px;
  background: linear-gradient(135deg, #35b6ee, #1a7fb3);
  display: grid; place-items: center; color: #fff;
  box-shadow: 0 6px 14px rgba(34, 158, 217, .35);
}
.logo-mark svg { width: 18px; height: 18px; fill: currentColor; }
.logo small { display: block; font-size: .68rem; font-weight: 600; color: var(--muted); letter-spacing: .06em; }

.nav-toggle {
  display: none; width: 42px; height: 42px; padding: 0;
  border: 1px solid var(--line); border-radius: 10px;
  background: #fff; cursor: pointer; align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; content: "";
}
.nav-toggle span::before { transform: translateY(-6px); }
.nav-toggle span::after { transform: translateY(4px); }

.main-nav ul {
  display: flex; align-items: center; gap: 4px;
  list-style: none; margin: 0; padding: 0;
}
.main-nav li { margin: 0; }
.main-nav a {
  display: block; padding: 8px 12px; border-radius: 8px;
  font-size: .94rem; font-weight: 600; color: var(--ink-2);
}
.main-nav a:hover { background: var(--bg-soft); color: var(--brand-2); text-decoration: none; }
.main-nav a[aria-current="page"] { color: var(--brand-2); background: var(--brand-soft); }

.header-cta { flex: 0 0 auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; border: 1px solid transparent;
  font-size: 1rem; font-weight: 700; line-height: 1.2; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, #2bb0e8, #1a7fb3);
  color: #fff; box-shadow: 0 10px 24px rgba(34, 158, 217, .34);
}
.btn-primary:hover { color: #fff; box-shadow: 0 14px 30px rgba(34, 158, 217, .45); }
.btn-ghost {
  background: rgba(255, 255, 255, .12); color: #fff; border-color: rgba(255, 255, 255, .55);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .2); color: #fff; }
.btn-outline { background: #fff; color: var(--brand-2); border-color: var(--brand); }
.btn-outline:hover { background: var(--brand-soft); color: var(--brand-2); }
.btn-sm { padding: 9px 18px; font-size: .9rem; }
.btn-lg { padding: 15px 34px; font-size: 1.06rem; }
.btn-block { width: 100%; }
.btn-download svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative; overflow: hidden; color: #eaf6fc;
  background: radial-gradient(1000px 460px at 78% -12%, rgba(52, 186, 240, .42), transparent 62%),
              radial-gradient(700px 380px at 8% 108%, rgba(34, 158, 217, .34), transparent 60%),
              linear-gradient(160deg, #081826 0%, #0d2c42 55%, #0a2135 100%);
  padding: 66px 0 72px;
}
.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(circle at 50% 40%, #000 20%, transparent 78%);
}
.hero .wrap { position: relative; z-index: 2; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 44px; align-items: center;
}
.hero h1 { color: #fff; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: #6fd2ff; }
.hero-sub { font-size: 1.06rem; color: #c3dced; max-width: 560px; margin-bottom: 26px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 22px; }
.hero-badges {
  display: flex; flex-wrap: wrap; gap: 10px 22px; list-style: none;
  padding: 0; margin: 0; font-size: .88rem; color: #a9c9dd;
}
.hero-badges li { margin: 0; display: inline-flex; align-items: center; gap: 7px; }
.hero-badges svg { width: 15px; height: 15px; fill: #4fc7f5; flex: 0 0 15px; }

.hero-visual { position: relative; display: flex; justify-content: center; }
.phone {
  width: 250px; border-radius: 30px; padding: 10px;
  background: linear-gradient(160deg, #17344b, #0b1f30);
  border: 1px solid rgba(255, 255, 255, .16);
  box-shadow: var(--shadow-lg);
}
.phone-screen {
  border-radius: 22px; overflow: hidden;
  background: linear-gradient(180deg, #eaf7ff, #f7fbfe 40%, #ffffff);
  color: var(--ink); padding: 16px 14px 18px; min-height: 320px;
}
.phone-top { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.phone-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: linear-gradient(135deg, #35b6ee, #1a7fb3);
  display: grid; place-items: center; color: #fff; font-size: .7rem; font-weight: 800;
}
.phone-top b { font-size: .82rem; }
.phone-top span { margin-left: auto; font-size: .64rem; color: var(--muted); }
.chat-line {
  display: flex; gap: 8px; margin-bottom: 9px; align-items: flex-start;
}
.chat-line .bubble {
  background: #fff; border: 1px solid var(--line); border-radius: 4px 12px 12px 12px;
  padding: 8px 11px; font-size: .72rem; line-height: 1.5; color: #33475b;
  box-shadow: 0 2px 6px rgba(13, 27, 42, .05); max-width: 82%;
}
.chat-line.me { justify-content: flex-end; }
.chat-line.me .bubble {
  background: #d7f0fd; border-color: #bfe6fa; border-radius: 12px 4px 12px 12px;
  color: #0d3a52;
}
.phone-cta {
  margin-top: 14px; text-align: center; font-size: .74rem; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, #2bb0e8, #1a7fb3);
  border-radius: 999px; padding: 9px;
}

/* 首屏截图 */
.hero-shot { margin: 0; }
.hero-shot img {
  display: block; width: 100%; height: auto; border-radius: 14px;
  background: #fff; border: 1px solid rgba(255, 255, 255, .18);
  box-shadow: 0 26px 60px rgba(0, 0, 0, .45);
}
.hero-shot figcaption {
  margin-top: 12px; text-align: center; font-size: .78rem; color: #8fb6cd;
}

/* ---------- 手机下载条 ---------- */
.quick-dl {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 0; margin: -34px auto 0; position: relative; z-index: 5;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
.quick-dl a {
  display: flex; align-items: center; gap: 13px; padding: 20px 22px;
  color: var(--ink); font-weight: 700; border-right: 1px solid var(--line);
  transition: background .18s ease;
}
.quick-dl a:last-child { border-right: 0; }
.quick-dl a:hover { background: var(--brand-soft); text-decoration: none; }
.quick-dl .qi {
  width: 40px; height: 40px; flex: 0 0 40px; border-radius: 11px;
  background: var(--brand-soft); color: var(--brand-2);
  display: grid; place-items: center;
}
.quick-dl svg { width: 21px; height: 21px; fill: currentColor; }
.quick-dl small { display: block; font-weight: 600; font-size: .76rem; color: var(--muted); }

/* ---------- 通用区块 ---------- */
.section { padding: 64px 0; }
.section-soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.section-head p { color: var(--muted); margin-bottom: 0; }
.eyebrow {
  display: inline-block; font-size: .78rem; font-weight: 800; letter-spacing: .12em;
  text-transform: uppercase; color: var(--brand-2); background: var(--brand-soft);
  padding: 5px 12px; border-radius: 999px; margin-bottom: 14px;
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #cfe3f0; }
.card h3 { margin-bottom: .5em; }
.card p { color: var(--muted); margin-bottom: 0; font-size: .95rem; }
.card-icon {
  width: 46px; height: 46px; border-radius: 13px; margin-bottom: 16px;
  background: var(--brand-soft); color: var(--brand-2);
  display: grid; place-items: center;
}
.card-icon svg { width: 23px; height: 23px; fill: currentColor; }

/* 平台下载卡 */
.platform-card { display: flex; flex-direction: column; padding: 28px; }
.platform-top { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.platform-top .card-icon { margin-bottom: 0; flex: 0 0 46px; }
.platform-top h3 { margin: 0; font-size: 1.1rem; }
.platform-top span { font-size: .8rem; color: var(--muted); }
.platform-card ul { list-style: none; padding: 0; margin: 0 0 20px; }
.platform-card li {
  position: relative; padding-left: 22px; font-size: .9rem; color: var(--muted); margin-bottom: 7px;
}
.platform-card li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 7px; height: 7px; border-radius: 50%; background: var(--brand);
  box-shadow: 0 0 0 3px rgba(34, 158, 217, .16);
}
.platform-card .btn { margin-top: auto; }
.platform-latest {
  font-size: .78rem; color: var(--muted); margin: 0 0 14px;
  display: flex; align-items: center; gap: 6px;
}
.platform-latest b { color: var(--ok); font-weight: 700; }

/* 步骤 */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 24px 24px;
}
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  display: block; font-size: 1.5rem; font-weight: 900; color: #cfe6f4; margin-bottom: 8px;
  letter-spacing: -.02em;
}
.step h3 { font-size: 1.03rem; }
.step p { color: var(--muted); font-size: .92rem; margin-bottom: 0; }

/* 数据条 */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  background: linear-gradient(140deg, #0d2c42, #0a2135); border-radius: var(--radius);
  padding: 34px 26px; color: #cfe6f4;
}
.stats div { text-align: center; }
.stats b { display: block; font-size: 1.75rem; color: #fff; line-height: 1.2; letter-spacing: -.02em; }
.stats span { font-size: .84rem; color: #9dc0d6; }

/* 文章列表 */
.post-list { display: grid; gap: 16px; }
.post-item {
  display: grid; grid-template-columns: 96px 1fr; gap: 20px; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; transition: box-shadow .2s ease, transform .2s ease;
}
.post-item:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.post-thumb {
  height: 74px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(135deg, #dff2fc, #c3e6f8); color: var(--brand-2);
  font-weight: 900; font-size: .82rem; letter-spacing: .04em;
}
.post-item h3 { font-size: 1.02rem; margin-bottom: .3em; }
.post-item p { font-size: .9rem; color: var(--muted); margin: 0; }
.post-meta { font-size: .78rem; color: #8aa0b2; margin-bottom: 6px; display: flex; gap: 12px; flex-wrap: wrap; }

/* FAQ 折叠 */
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 0 20px; overflow: hidden;
}
.faq-item[open] { border-color: #bfe3f6; box-shadow: 0 8px 22px rgba(34, 158, 217, .1); }
.faq-item summary {
  cursor: pointer; list-style: none; padding: 18px 34px 18px 0; position: relative;
  font-weight: 700; color: var(--ink); font-size: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%);
  width: 24px; height: 24px; border-radius: 50%; background: var(--brand-soft); color: var(--brand-2);
  display: grid; place-items: center; font-weight: 800; font-size: 1rem; line-height: 1;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-body { padding: 0 0 18px; color: var(--muted); font-size: .95rem; }
.faq-item .faq-body p:last-child { margin-bottom: 0; }

/* CTA 区块 */
.cta-band {
  background: radial-gradient(620px 280px at 82% 10%, rgba(52, 186, 240, .38), transparent 62%),
              linear-gradient(150deg, #0b2437, #12405c);
  border-radius: var(--radius); color: #d9ecf7; padding: 44px 40px; text-align: center;
}
.cta-band h2 { color: #fff; margin-bottom: 12px; }
.cta-band p { max-width: 620px; margin: 0 auto 24px; color: #a9c9dd; }
.cta-band .btn-ghost { margin-left: 10px; }

/* ---------- 内页头图 ---------- */
.page-hero {
  background: radial-gradient(700px 320px at 80% -20%, rgba(52, 186, 240, .32), transparent 62%),
              linear-gradient(150deg, #0b2437, #0d3350);
  color: #cfe6f4; padding: 46px 0 40px;
}
.page-hero h1 { color: #fff; margin-bottom: 12px; }
.page-hero p { color: #a9c9dd; max-width: 760px; margin-bottom: 0; }
.breadcrumb { font-size: .82rem; color: #8fb6cd; margin-bottom: 14px; }
.breadcrumb a { color: #a9c9dd; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { margin: 0 6px; opacity: .6; }

/* ---------- 正文排版 ---------- */
.article { padding: 52px 0 72px; }
.article-body { max-width: 820px; }
.article-body h2 {
  margin-top: 2.1em; padding-top: .2em; scroll-margin-top: 90px;
  border-top: 1px solid var(--line); padding-top: 1.2em;
}
.article-body h2:first-of-type { border-top: 0; margin-top: 0; padding-top: 0; }
.article-body h3 { margin-top: 1.7em; color: var(--ink); }
.article-body p, .article-body li { color: #33475b; }
.article-body strong { color: var(--ink); }
.article-body code {
  background: #eef4f9; border: 1px solid var(--line); border-radius: 5px;
  padding: 1px 6px; font-size: .9em; color: #0d3a52;
}
.article-meta {
  display: flex; flex-wrap: wrap; gap: 14px; font-size: .82rem; color: var(--muted);
  border-bottom: 1px solid var(--line); padding-bottom: 18px; margin-bottom: 30px;
}
.toc {
  background: var(--bg-soft); border: 1px solid var(--line); border-left: 3px solid var(--brand);
  border-radius: var(--radius-sm); padding: 18px 22px; margin: 0 0 32px;
}
.toc strong { display: block; font-size: .9rem; color: var(--ink); margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 1.2em; font-size: .92rem; }
.toc li { margin-bottom: .3em; }

.callout {
  background: var(--brand-soft); border: 1px solid #bfe3f6; border-radius: var(--radius-sm);
  padding: 18px 22px; margin: 24px 0;
}
.callout p:last-child { margin-bottom: 0; }
.callout warn, .callout-warn { background: #fff7ed; border-color: #fed7aa; }

.table-scroll { overflow-x: auto; margin: 0 0 26px; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; min-width: 520px; }
th, td { border: 1px solid var(--line); padding: 12px 14px; text-align: left; vertical-align: top; }
th { background: var(--bg-soft); color: var(--ink); font-weight: 700; white-space: nowrap; }
td { color: #33475b; }

.dl-card {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px;
  background: linear-gradient(180deg, #fbfdff, #fff); box-shadow: var(--shadow);
  margin: 0 0 30px;
}
.dl-card-head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.dl-card-head .card-icon { margin: 0; width: 52px; height: 52px; flex: 0 0 52px; }
.dl-card-head h2 { margin: 0; font-size: 1.3rem; border: 0; padding: 0; }
.dl-card-head .ver { font-size: .82rem; color: var(--muted); }
.dl-card .btn { margin-top: 6px; }
.dl-note { font-size: .82rem; color: var(--muted); margin: 12px 0 0; }
.spec-list { list-style: none; padding: 0; margin: 18px 0; display: grid; gap: 8px; }
.spec-list li {
  display: flex; justify-content: space-between; gap: 16px; font-size: .9rem;
  border-bottom: 1px dashed var(--line); padding-bottom: 8px; color: var(--muted); margin: 0;
}
.spec-list b { color: var(--ink); font-weight: 600; text-align: right; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #08161f; color: #8fa9bb; padding: 52px 0 26px; font-size: .9rem;
  margin-top: 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px;
  padding-bottom: 34px; border-bottom: 1px solid rgba(255, 255, 255, .09);
}
.site-footer h4 { color: #fff; font-size: .92rem; margin-bottom: 14px; letter-spacing: .02em; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 9px; }
.site-footer a { color: #8fa9bb; }
.site-footer a:hover { color: #6fd2ff; text-decoration: none; }
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand .logo:hover { color: #fff; }
.footer-brand p { color: #7b93a5; font-size: .87rem; line-height: 1.75; }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding-top: 22px; font-size: .8rem; color: #6b8494;
}
.footer-bottom p { margin: 0; }
.disclaimer { font-size: .78rem; color: #5f7787; margin-top: 14px; line-height: 1.7; }

/* ---------- 404 ---------- */
.err-wrap { min-height: 58vh; display: grid; place-items: center; text-align: center; padding: 70px 20px; }
.err-code {
  font-size: clamp(4rem, 16vw, 8rem); font-weight: 900; line-height: 1;
  background: linear-gradient(135deg, #2bb0e8, #12405c); -webkit-background-clip: text;
  background-clip: text; color: transparent; letter-spacing: -.04em;
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed; right: 20px; bottom: 24px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line);
  background: #fff; color: var(--brand-2); box-shadow: var(--shadow);
  display: grid; place-items: center; cursor: pointer;
  opacity: 0; visibility: hidden; transition: opacity .2s ease, visibility .2s ease, transform .2s ease;
  transform: translateY(8px);
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero-visual { order: -1; }
  .phone { width: 220px; }
  .phone-screen { min-height: 0; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .main-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 30px rgba(13, 27, 42, .1);
    display: none; padding: 10px 16px 16px;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 2px; }
  .main-nav a { padding: 12px 14px; font-size: 1rem; border-radius: 10px; }
  .header-cta { display: none; }
  .quick-dl { grid-template-columns: 1fr; margin-top: -26px; }
  .quick-dl a { border-right: 0; border-bottom: 1px solid var(--line); }
  .quick-dl a:last-child { border-bottom: 0; }
  .grid-2, .grid-3, .steps { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); padding: 26px 18px; }
  .section { padding: 48px 0; }
  .hero { padding: 48px 0 60px; }
  .cta-band { padding: 34px 22px; }
  .cta-band .btn-ghost { margin: 12px 0 0; }
  .post-item { grid-template-columns: 1fr; }
  .post-thumb { height: 56px; }
  .dl-card { padding: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}