/* ============================================================
   AShell 官网样式 — 终端风格暗色主题
   零外部依赖：系统字体栈 + 原生 CSS
   ============================================================ */

:root {
  --bg: #0a0f16;
  --bg-soft: #0e1520;
  --card: #111a26;
  --card-hover: #14202e;
  --border: rgba(148, 178, 209, 0.12);
  --border-strong: rgba(148, 178, 209, 0.22);
  --text: #e8eef5;
  --muted: #93a4b8;
  --dim: #6b7d92;

  --accent: #3ddc97;        /* 终端绿 */
  --accent-2: #4cc2ff;      /* 亮蓝 */
  --accent-3: #8b7bff;      /* 紫 */
  --gradient: linear-gradient(120deg, #3ddc97 0%, #4cc2ff 55%, #8b7bff 100%);

  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;

  --radius: 14px;
  --nav-h: 64px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(61, 220, 151, 0.28); }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.container {
  width: min(1140px, calc(100% - 48px));
  margin-inline: auto;
}

/* ---------- 背景装饰 ---------- */
.bg-deco {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.16;
}
.bg-glow--1 {
  width: 560px; height: 560px;
  background: var(--accent);
  top: -180px; left: -120px;
}
.bg-glow--2 {
  width: 640px; height: 640px;
  background: var(--accent-2);
  top: 12%; right: -220px;
  opacity: 0.12;
}
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 178, 209, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 178, 209, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 40%, transparent 100%);
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(10, 15, 22, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease;
}
.nav.is-scrolled { border-bottom-color: var(--border); }

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
}
.nav__logo { width: 26px; height: 26px; border-radius: 6px; }
.nav__links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  font-size: 14.5px;
  color: var(--muted);
}
.nav__links a {
  transition: color 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav__links a:hover { color: var(--text); }
.nav__gh {
  padding: 6px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-weight: 600;
}
.nav__gh:hover { border-color: var(--accent); color: var(--accent) !important; }

.nav__actions { display: flex; align-items: center; gap: 12px; }

/* 语言切换 */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  padding: 4px 12px 4px 5px;
  cursor: pointer;
  font-family: var(--sans);
  transition: border-color 0.18s ease, color 0.18s ease;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--text); }
.lang-toggle__track {
  width: 26px; height: 20px;
  border-radius: 999px;
  background: rgba(148, 178, 209, 0.14);
  display: grid;
  place-items: center;
}
.lang-toggle__thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  color: #06281a;
  font-size: 10px;
  font-weight: 800;
  display: grid;
  place-items: center;
  transition: transform 0.2s ease;
}
.lang-toggle.is-en .lang-toggle__thumb { transform: translateX(0); }
.lang-toggle.is-zh .lang-toggle__thumb { transform: translateX(0); }

/* 汉堡按钮（移动端） */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px; height: 38px;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  cursor: pointer;
  padding: 8px;
}
.nav__burger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--gradient);
  color: #04121b;
  box-shadow: 0 8px 28px rgba(61, 220, 151, 0.22);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgba(61, 220, 151, 0.3);
}
.btn--ghost {
  background: rgba(148, 178, 209, 0.06);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover {
  background: rgba(148, 178, 209, 0.12);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Hero ---------- */
.hero { padding: calc(var(--nav-h) + 72px) 0 40px; text-align: center; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(148, 178, 209, 0.06);
  color: var(--muted);
  font-size: 13.5px;
  font-family: var(--mono);
}
.hero__badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.82); }
}

.hero__title {
  margin-top: 26px;
  font-size: clamp(52px, 9vw, 92px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__tagline {
  max-width: 760px;
  margin: 22px auto 0;
  font-size: clamp(17px, 2.4vw, 20px);
  color: var(--text);
  font-weight: 500;
}
.hero__sub {
  max-width: 640px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 15.5px;
}

.hero__cta {
  margin-top: 34px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero__platforms {
  margin-top: 26px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 13px;
}
.hero__platforms li.sep {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--dim);
  opacity: 0.6;
}

/* 截图窗口 */
.hero__shot { margin-top: 56px; }
.shot {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(61, 220, 151, 0.08),
    0 0 90px rgba(76, 194, 255, 0.1);
}
.shot__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  background: rgba(148, 178, 209, 0.05);
  border-bottom: 1px solid var(--border);
}
.shot__dot { width: 11px; height: 11px; border-radius: 50%; }
.shot__dot--r { background: #ff5f57; }
.shot__dot--y { background: #febc2e; }
.shot__dot--g { background: #28c840; }
.shot__title {
  margin-left: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--dim);
}
.shot img { width: 100%; }

/* 数据条 */
.stats {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(17, 26, 38, 0.6);
  padding: 26px 12px;
}
.stats li {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stats li + li { border-left: 1px solid var(--border); }
.stats strong {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  font-family: var(--mono);
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stats span { font-size: 13px; color: var(--muted); }

/* ---------- 通用 section ---------- */
section { padding: 84px 0; }

.sec-title {
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.01em;
  text-align: center;
}
.sec-sub {
  text-align: center;
  color: var(--muted);
  max-width: 640px;
  margin: 14px auto 0;
  font-size: 15.5px;
}

/* ---------- 三大理念 ---------- */
.pillars { padding-top: 40px; }
.pillars__grid {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.pillar {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.pillar:hover {
  transform: translateY(-4px);
  border-color: rgba(61, 220, 151, 0.4);
  background: var(--card-hover);
}
.pillar__icon {
  width: 48px; height: 48px;
  display: grid;
  place-items: center;
  color: var(--accent);
  border-radius: 12px;
  background: rgba(61, 220, 151, 0.1);
  border: 1px solid rgba(61, 220, 151, 0.2);
  margin-bottom: 18px;
}
.pillar__icon svg { width: 24px; height: 24px; }
.pillar h3 { font-size: 19px; margin-bottom: 8px; }
.pillar p { color: var(--muted); font-size: 14.5px; }

/* ---------- 功能特性 ---------- */
.features__grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.fcard {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  position: relative;
  overflow: hidden;
}
.fcard::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.fcard:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--card-hover);
}
.fcard:hover::before { opacity: 1; }
.fcard__head {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-bottom: 10px;
}
.fcard__icon {
  width: 42px; height: 42px;
  flex: none;
  display: grid;
  place-items: center;
  font-size: 21px;
  border-radius: 10px;
  background: rgba(76, 194, 255, 0.09);
  border: 1px solid rgba(76, 194, 255, 0.18);
  color: var(--accent-2);
}
.fcard__icon svg { width: 22px; height: 22px; }
.fcard h3 { font-size: 17.5px; }
.fcard > p { color: var(--muted); font-size: 14.5px; min-height: 0; }
.fcard__tags {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.fcard__tags span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  background: rgba(61, 220, 151, 0.08);
  border: 1px solid rgba(61, 220, 151, 0.16);
  padding: 3px 10px;
  border-radius: 6px;
}

/* ---------- Web 服务器 ---------- */
.web { background: var(--bg-soft); border-block: 1px solid var(--border); }

.terminal {
  margin-top: 44px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: #0a111b;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
}
.terminal__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  background: rgba(148, 178, 209, 0.05);
  border-bottom: 1px solid var(--border);
}
.terminal__title {
  margin-left: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--dim);
}
.copy-btn {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background: rgba(148, 178, 209, 0.08);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 4px 12px;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.is-copied { color: var(--accent); border-color: var(--accent); }

.terminal__body {
  padding: 20px 22px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.85;
  overflow-x: auto;
  color: #cfe3f5;
}
.t-prompt { color: var(--accent); font-weight: 700; }
.t-flag { color: var(--accent-2); }
.t-comment { color: var(--dim); }

.web__opts {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.opt {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.opt h3 {
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.opt__tag {
  font-size: 11px;
  font-weight: 700;
  color: #06281a;
  background: var(--accent);
  border-radius: 5px;
  padding: 2px 8px;
}
.opt p { color: var(--muted); font-size: 14px; }

/* ---------- 下载 ---------- */
.dl__grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.dl-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  text-align: center;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.dl-card:hover {
  transform: translateY(-4px);
  border-color: rgba(76, 194, 255, 0.45);
  background: var(--card-hover);
}
.dl-card__icon {
  width: 54px; height: 54px;
  margin: 0 auto 18px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--accent-2);
  background: rgba(148, 178, 209, 0.08);
  border: 1px solid var(--border-strong);
}
.dl-card__icon svg { width: 30px; height: 30px; }
.dl-card__icon--win { color: #38bdf8; }
.dl-card__icon--linux { color: var(--accent); }
.dl-card h3 { font-size: 18px; }
.dl-card p {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--accent-2);
  margin-top: 6px;
}
.dl-card__meta {
  display: inline-block;
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--dim);
}
.dl__actions { margin-top: 34px; text-align: center; }

/* ---------- 源码构建 ---------- */
.build { padding-bottom: 110px; }
.build__inner {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 44px;
  align-items: center;
}
.build__text .sec-title { text-align: left; }
.build__text p {
  color: var(--muted);
  margin: 16px 0 26px;
  font-size: 15.5px;
}
.terminal--sm { margin-top: 0; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 44px 0 36px;
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px;
}
.footer__brand { display: flex; align-items: center; gap: 12px; }
.footer__logo { width: 34px; height: 34px; border-radius: 8px; }
.footer__name { font-weight: 700; font-size: 16px; }
.footer__desc { font-size: 13px; color: var(--dim); }
.footer__links {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: 14px;
  color: var(--muted);
  flex-wrap: wrap;
}
.footer__links a:hover { color: var(--accent); }
.footer__copy {
  width: 100%;
  margin-top: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--dim);
  font-size: 13px;
}

/* ---------- 功能详情文档页 ---------- */
.doc-hero { padding: calc(var(--nav-h) + 60px) 0 30px; }
.doc-hero .sec-title { text-align: left; }
.doc-hero .sec-sub { text-align: left; margin: 14px 0 0; }

.doc {
  display: grid;
  grid-template-columns: 232px 1fr;
  gap: 52px;
  align-items: start;
  padding-bottom: 90px;
}
.doc__toc {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  align-self: start;
}
.doc__toc-title {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 14px;
  font-family: var(--mono);
}
.doc__toc ol {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-left: 1px solid var(--border);
}
.doc__toc a {
  display: block;
  padding: 8px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 14px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.doc__toc-num {
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--accent);
  margin-right: 1px;
  opacity: 0.92;
}
.doc__toc a:hover { color: var(--text); }
.doc__toc a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

.feat-section {
  padding: 10px 0 54px;
  scroll-margin-top: calc(var(--nav-h) + 20px);
  border-top: 1px solid var(--border);
}
.feat-section:first-of-type { border-top: none; }
.feat-section__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 4px;
}
.feat-section__icon {
  width: 40px; height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(76, 194, 255, 0.09);
  border: 1px solid rgba(76, 194, 255, 0.18);
  color: var(--accent-2);
}
.feat-section__icon svg { width: 21px; height: 21px; }
.feat-section h2 { font-size: 22px; font-weight: 800; }
.feat-section__desc {
  color: var(--text);
  font-size: 15.5px;
  margin: 6px 0 16px;
  max-width: 72ch;
}
.feat-section__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}
.feat-section__tags span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  background: rgba(61, 220, 151, 0.08);
  border: 1px solid rgba(61, 220, 151, 0.16);
  padding: 3px 10px;
  border-radius: 6px;
}

/* 截图占位（后续替换为真实截图） */
.shot-placeholder {
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(45deg, rgba(148, 178, 209, 0.035) 0 12px, transparent 12px 24px);
  display: grid;
  place-items: center;
  text-align: center;
  overflow: hidden;
}
.shot-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 42%, rgba(76, 194, 255, 0.09), transparent 72%);
}
.shot-placeholder__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}
.shot-placeholder svg { width: 30px; height: 30px; opacity: 0.5; }
.shot-placeholder strong { color: var(--muted); font-weight: 600; font-size: 14px; }
.shot-placeholder span { font-family: var(--mono); font-size: 11.5px; color: var(--dim); }
.shot-placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 真实功能截图 */
.feat-shot { margin-top: 4px; }
.feat-shot img { width: 100%; display: block; }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .pillars__grid, .web__opts, .dl__grid { grid-template-columns: 1fr 1fr; }
  .doc { grid-template-columns: 1fr; gap: 24px; }
  .doc__toc { position: static; top: auto; }
  .doc__toc ol { flex-direction: row; flex-wrap: wrap; border-left: none; gap: 4px; }
  .doc__toc a { border-left: none; border-bottom: 2px solid transparent; padding: 6px 10px; font-size: 13px; }
  .doc__toc a.is-active { border-left: none; border-bottom-color: var(--accent); }
  .build__inner { grid-template-columns: 1fr; gap: 30px; }
  .build__text .sec-title { text-align: center; }
  .build__text { text-align: center; }
  .stats { grid-template-columns: repeat(3, 1fr); row-gap: 22px; }
  .stats li:nth-child(4) { border-left: none; }
}

@media (max-width: 720px) {
  section { padding: 60px 0; }
  .hero { padding-top: calc(var(--nav-h) + 48px); }
  .features__grid { grid-template-columns: 1fr; }
  .pillars__grid, .web__opts, .dl__grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats li:nth-child(odd) { border-left: none; }
  .stats li { padding: 4px 0; }

  /* 移动端导航 */
  .nav__burger { display: flex; }
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(10, 15, 22, 0.97);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 18px;
    display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a {
    padding: 13px 4px;
    border-bottom: 1px solid var(--border);
    font-size: 15px;
  }
  .nav__links a:last-child { border-bottom: none; }
  .nav__gh { justify-content: center; margin-top: 10px; }
  .hero__cta .btn { width: 100%; justify-content: center; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .footer__links { margin-left: 0; }
}