/* ============================================================
   AltSnap 中文站 全局样式
   主色取自仓库官方 Logo（media/AltSnap-128.png，不透明像素
   主色为近黑 #111111，经中性化处理写入 --c-primary）。
   无外部字体/框架/CDN；系统字体栈；扁平现代浅色。
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 品牌：来自官方 Logo 的墨黑 */
  --c-primary: #111827;        /* 主色（Logo 主色中性化） */
  --c-primary-soft: #374151;   /* 主色柔和层次 */
  --c-accent: #1d4ed8;         /* 强调色（链接/主按钮，对比度 AA） */
  --c-accent-dark: #1e40af;    /* 强调色 hover */
  --c-bg: #ffffff;
  --c-bg-soft: #f5f6f8;        /* 分区浅灰底 */
  --c-bg-mute: #eef0f3;        /* 卡片悬浮层 */
  --c-text: #1f2937;           /* 正文，对 --c-bg 对比度 14.7:1 */
  --c-text-2: #4b5563;         /* 次级文字，7:1 */
  --c-line: #e2e5ea;           /* 描边 */
  --c-code-bg: #f3f4f6;
  --c-focus: #0f4fc5;          /* focus-visible 描边 */
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 20px;
  --shadow-1: 0 1px 2px rgba(17, 24, 39, 0.06);
  --shadow-2: 0 10px 30px rgba(17, 24, 39, 0.10);
  --maxw: 1080px;
  --header-h: 64px;
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  display: flex;
  min-height: 100dvh;
  flex-direction: column;
}

main { flex: 1 0 auto; width: 100%; }

img { max-width: 100%; height: auto; }

a { color: var(--c-accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--c-accent-dark); }

:focus-visible {
  outline: 3px solid var(--c-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: #dbeafe; color: var(--c-primary); }

/* ---------- 布局容器 ---------- */
.container {
  width: min(var(--maxw), calc(100% - 48px));
  margin-inline: auto;
}

.section { padding-block: clamp(56px, 8vw, 88px); }
.section--soft { background: var(--c-bg-soft); }

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 200;
  background: var(--c-primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--radius-s);
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}
.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, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-line);
}

.nav {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--c-primary);
  text-decoration: none;
  letter-spacing: 0.2px;
  margin-right: auto;
}
.brand img { width: 30px; height: 30px; display: block; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: var(--radius-s);
  color: var(--c-text-2);
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-links a:hover { background: var(--c-bg-mute); color: var(--c-primary); }
.nav-links a[aria-current="page"] {
  color: var(--c-primary);
  background: var(--c-bg-mute);
  font-weight: 600;
}

/* 导航内的主按钮（立即下载）：恢复黑底白字，
   覆盖 .nav-links a / a:hover 的默认配色与 hover 底色 */
.nav-links a.btn,
.nav-links a.btn:hover {
  color: #ffffff;
  background: var(--c-primary);
}
.nav-links a.btn:hover { background: #000000; }

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  background: var(--c-bg);
  cursor: pointer;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 26px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease,
    background 0.12s ease, border-color 0.12s ease;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--c-primary);
  color: #ffffff;
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { background: #000; color: #fff; }

.btn--ghost {
  background: var(--c-bg);
  color: var(--c-primary);
  border-color: var(--c-line);
}
.btn--ghost:hover { border-color: var(--c-primary); }

.btn--block { width: 100%; }

/* ---------- 英雄区 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(720px 360px at 88% -10%, rgba(29, 78, 216, 0.07), transparent 62%),
    radial-gradient(560px 300px at -6% 108%, rgba(17, 24, 39, 0.06), transparent 60%),
    var(--c-bg);
  border-bottom: 1px solid var(--c-line);
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  padding-block: clamp(56px, 7vw, 92px);
}

.hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1.22;
  letter-spacing: 0.2px;
  color: var(--c-primary);
  font-weight: 800;
}
.hero h1 .accent { color: var(--c-accent); }

.hero__lead {
  margin: 0 0 14px;
  font-size: clamp(16px, 2vw, 18.5px);
  color: var(--c-text-2);
  max-width: 34em;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 26px;
  padding: 0;
  list-style: none;
}
.hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--c-text-2);
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

.hero__fig { margin: 0; }
.hero__fig img {
  width: 100%;
  border-radius: var(--radius-l);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-2);
  display: block;
}
.hero__fig figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: #5b6472; /* 对 --c-bg 4.9:1 */
  text-align: center;
}

/* 入场动画（尊重减少动态偏好） */
@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.anim-rise { animation: rise 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) both; }
.anim-rise--1 { animation-delay: 0.05s; }
.anim-rise--2 { animation-delay: 0.14s; }
.anim-rise--3 { animation-delay: 0.23s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- 通用小节 ---------- */
.section-head { max-width: 640px; margin-bottom: clamp(28px, 4vw, 44px); }
.section-head--center { margin-inline: auto; text-align: center; }

.kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2.5px;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-head h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.3;
  color: var(--c-primary);
  font-weight: 750;
}
.section-head p { margin: 0; color: var(--c-text-2); }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  position: relative;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  padding: 26px 24px 24px;
  box-shadow: var(--shadow-1);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
  border-color: #cdd3dc;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 17.5px;
  color: var(--c-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}
.card p { margin: 0; font-size: 14.5px; color: var(--c-text-2); }

.card__icon {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--c-bg-soft);
  color: var(--c-primary);
}
.card__icon svg { width: 21px; height: 21px; }

/* 数字滚动统计条 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.stat {
  text-align: center;
  padding: 22px 12px;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
}
.stat__num {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  color: var(--c-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}
.stat__label { font-size: 13.5px; color: var(--c-text-2); margin-top: 4px; }

/* ---------- 步骤列表 ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.steps li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  padding: 18px 20px;
}
.steps .no {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 3px;
}
.steps h3 { margin: 0 0 4px; font-size: 16px; color: var(--c-primary); }
.steps p { margin: 0; font-size: 14.5px; color: var(--c-text-2); }

/* ---------- 快捷键表 ---------- */
kbd {
  display: inline-block;
  padding: 2px 9px;
  font-family: Consolas, Menlo, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-primary);
  background: var(--c-code-bg);
  border: 1px solid #d3d7de;
  border-bottom-width: 2px;
  border-radius: 6px;
  white-space: nowrap;
}

.table-wrap { overflow-x: auto; border: 1px solid var(--c-line); border-radius: var(--radius-m); background: var(--c-bg); }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 520px; }
caption { text-align: left; padding: 14px 16px 4px; font-size: 13px; color: var(--c-text-2); }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--c-line); vertical-align: top; }
thead th { background: var(--c-bg-soft); color: var(--c-primary); font-weight: 650; white-space: nowrap; }
tbody tr:last-child td { border-bottom: none; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 12px; }

.faq {
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  background: var(--c-bg);
  overflow: hidden;
}
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  font-weight: 600;
  color: var(--c-primary);
  font-size: 15.5px;
  min-height: 44px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .chev { flex: none; transition: transform 0.2s ease; color: var(--c-text-2); }
.faq[open] summary .chev { transform: rotate(180deg); }
.faq .faq__body { padding: 0 20px 18px; color: var(--c-text-2); font-size: 14.5px; }
.faq .faq__body :where(p, ul, ol) + :where(p, ul, ol) { margin-top: 10px; }
.faq .faq__body ul, .faq .faq__body ol { margin: 8px 0 0; padding-left: 22px; }
.faq .faq__body code {
  background: var(--c-code-bg);
  border-radius: 5px;
  padding: 1px 6px;
  font-size: 13px;
  color: var(--c-primary);
}

/* ---------- 截图展示 ---------- */
.shot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.shot {
  margin: 0;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  padding: 14px;
  box-shadow: var(--shadow-1);
}
.shot img {
  display: block;
  width: 100%;
  border-radius: var(--radius-s);
  border: 1px solid var(--c-line);
}
.shot figcaption { margin-top: 10px; font-size: 13px; color: #5b6472; text-align: center; }

/* ---------- 下载卡片 ---------- */
.dl-card {
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-1);
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}
.dl-card:hover { box-shadow: var(--shadow-2); transform: translateY(-3px); }
.dl-card h3 { margin: 0; font-size: 18px; color: var(--c-primary); }
.dl-card .dl-note { font-size: 13.5px; color: var(--c-text-2); }
.dl-card .file {
  font-family: Consolas, Menlo, monospace;
  font-size: 13px;
  color: var(--c-text-2);
  background: var(--c-code-bg);
  border-radius: 6px;
  padding: 7px 10px;
  word-break: break-all;
}
.tag {
  align-self: flex-start;
  font-size: 12.5px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-line);
  color: var(--c-text-2);
}
.tag--rec { background: #eef4ff; border-color: #d4e2ff; color: #1e40af; }

.notice {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: #fbfcfe;
  border: 1px solid #d4e2ff;
  border-radius: var(--radius-m);
  padding: 16px 18px;
  font-size: 14px;
  color: var(--c-text-2);
}
.notice svg { flex: none; width: 19px; height: 19px; color: var(--c-accent); margin-top: 3px; }
.notice strong { color: var(--c-primary); }

/* ---------- 关于页事实表 ---------- */
.facts { border-top: 1px solid var(--c-line); }
.facts div {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--c-line);
  font-size: 14.5px;
}
.facts dt { color: var(--c-text-2); margin: 0; }
.facts dd { margin: 0; color: var(--c-text); }

.source-list { margin: 0; padding-left: 20px; }
.source-list li { margin-bottom: 10px; font-size: 14.5px; }
.source-list code {
  background: var(--c-code-bg);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 13px;
  color: var(--c-text-2);
}

/* ---------- CTA 条 ---------- */
.cta-band {
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--radius-l);
  padding: clamp(32px, 5vw, 52px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}
.cta-band h2 { margin: 0 0 8px; font-size: clamp(22px, 3vw, 28px); color: #fff; }
.cta-band p { margin: 0; color: #c8cdd6; font-size: 15px; }
.cta-band .btn--primary { background: #fff; color: var(--c-primary); }
.cta-band .btn--primary:hover { background: #e8eaee; color: #000; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: auto;
  background: #101418;
  color: #9aa3af;
  padding: 44px 0 30px;
  font-size: 13.5px;
}
.site-footer a { color: #c5cbd4; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 26px;
  border-bottom: 1px solid #262c33;
}
.footer-grid h2, .footer-grid h3 { color: #e7eaee; font-size: 14.5px; margin: 0 0 12px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; color: #e7eaee; text-decoration: none; margin-bottom: 10px; }
.footer-brand img { width: 26px; height: 26px; }
.footer-note p { margin: 0 0 8px; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding-top: 22px;
  font-size: 12.5px;
  color: #7d8694;
}

/* ---------- 面包屑 ---------- */
.breadcrumb { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 18px 0 0; margin: 0 auto; font-size: 13.5px; }
.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; color: var(--c-text-2); }
.breadcrumb li + li::before { content: "/"; color: #98a1ae; }
.breadcrumb a { color: var(--c-text-2); }
.breadcrumb [aria-current="page"] { color: var(--c-primary); font-weight: 600; }

/* ---------- 页头（子页） ---------- */
.page-head { padding: 26px 0 8px; }
.page-head h1 {
  margin: 6px 0 10px;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.25;
  color: var(--c-primary);
  font-weight: 800;
}
.page-head .lead { margin: 0; color: var(--c-text-2); font-size: clamp(15.5px, 2vw, 17.5px); max-width: 44em; }

/* ---------- 下载弹窗 ---------- */
.dl-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(15, 18, 24, 0.55);
  backdrop-filter: blur(3px);
}
.dl-overlay.is-open { display: flex; }

.dl-dialog {
  width: min(560px, 100%);
  background: var(--c-bg);
  border-radius: var(--radius-l);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.30);
  padding: 26px 26px 28px;
  position: relative;
  animation: rise 0.28s ease both;
}
.dl-dialog__close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-line);
  background: var(--c-bg);
  border-radius: 10px;
  cursor: pointer;
  color: var(--c-text-2);
}
.dl-dialog__close:hover { background: var(--c-bg-mute); color: var(--c-primary); }
.dl-dialog h2 { margin: 0 40px 6px 0; font-size: 19px; color: var(--c-primary); }
.dl-dialog .dl-dialog__sub { margin: 0 0 20px; font-size: 13.5px; color: var(--c-text-2); }

.qr-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.qr-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: var(--c-bg-soft);
  border: 1px dashed #b9c1cc;
  border-radius: var(--radius-m);
  padding: 18px 12px 16px;
}
.qr-img {
  display: block;
  width: 148px;          /* 统一显示尺寸 */
  height: 148px;
  object-fit: contain;   /* 不拉伸变形 */
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: 10px;
  image-rendering: pixelated; /* 二维码按像素放大，保持边缘锐利 */
}
.qr-label { font-size: 14px; font-weight: 600; color: var(--c-text); text-align: center; }

.dl-dialog__tip {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
  font-size: 12.5px;
  color: #5b6472;
  text-align: center;
}

body.dialog-open { overflow: hidden; }

/* ---------- 相关推荐（内链） ---------- */
.related {
  padding-block: clamp(40px, 6vw, 64px);
  border-top: 1px solid var(--c-line);
  background: var(--c-bg-soft);
}
.related h2 {
  margin: 0 0 20px;
  font-size: 20px;
  color: var(--c-primary);
  font-weight: 700;
}
.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.related-card a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 18px 20px;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  text-decoration: none;
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}
.related-card a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: #cdd3dc;
}
.related-card strong { color: var(--c-primary); font-size: 15.5px; }
.related-card span { color: var(--c-text-2); font-size: 13.5px; line-height: 1.65; }

@media (max-width: 900px) {
  .related-list { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .related-list { grid-template-columns: 1fr; }
}

/* ---------- 404 ---------- */
.p404 { text-align: center; padding: clamp(70px, 12vw, 130px) 0; }
.p404 .code {
  font-size: clamp(72px, 14vw, 130px);
  font-weight: 800;
  line-height: 1;
  color: var(--c-primary);
  letter-spacing: 4px;
}
.p404 h1 { margin: 14px 0 10px; font-size: clamp(20px, 3vw, 26px); color: var(--c-primary); }
.p404 p { color: var(--c-text-2); margin: 0 0 26px; }
.p404 .btn { margin-inline: 6px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__fig { order: -1; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .shot-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .container { width: calc(100% - 36px); }
  .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .nav-links {
    position: absolute;
    top: calc(var(--header-h) + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--c-bg);
    border-bottom: 1px solid var(--c-line);
    padding: 10px 18px 16px;
    gap: 2px;
    box-shadow: var(--shadow-2);
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a.btn { margin-top: 6px; }
  .nav-toggle { display: inline-flex; }
  .qr-row { grid-template-columns: 1fr; }
  .facts div { grid-template-columns: 1fr; gap: 2px; }
  .cta-band { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}