/* ═══════════════════════════════════════
   RSNAS · style.css  v8
   ─────────────────────────────────────
   全面 Bug 审查与修复记录：

   [BUG-1] 严重语法错误 — @supports 嵌套在 html{} 内
     @supports 是顶层 at-rule，不能嵌套在选择器规则块内。
     修复：将 @supports 提至顶层。

   [BUG-2] 导航抖动根本原因 — ::before ghost 完全多余且有害
     当前设计中 font-weight 在任何状态下均为 400，从未改变。
     ghost 根本没有解决任何问题，反而是抖动来源：
     ① display:block; height:0; overflow:hidden 在高 DPI 下
        存在 0.5px 墨水溢出，导致微小视觉位移
     ② font-weight:600 的隐藏文本触发浏览器加载粗体字重文件，
        字体加载完成时引发 reflow
     修复：彻底删除 ::before ghost，改用 display:flex + 固定 height:36px。
     固定高度从根本上消除垂直方向抖动。

   [BUG-3] 导航链接间距过小
     gap:4px 不够，改为 gap:6px；
     padding 改为 0 16px（配合 height:36px）。

   [BUG-4] .nav-link::after 的 transition 无效
     ::after 从"不存在"到"存在"不触发 transition。
     修复：对所有 .nav-link 预先声明 ::after（opacity:0），
     active 时改为 opacity:1，transition 正确触发。

   [BUG-5] nav-inner gap 与子元素 margin 双重叠加间距混乱
     修复：nav-inner gap 改为 0，间距全部由子元素 margin 统一管理。
   ═══════════════════════════════════════ */

/* ─── CSS 变量 ────────────────────────── */
:root {
  --bg:         #ffffff;
  --bg-alt:     #f5f5f7;
  --bg-dark:    #1d1d1f;
  --text:       #1d1d1f;
  --text-2:     #6e6e73;
  --text-3:     #a1a1a6;
  --accent:     #0071e3;
  --accent-h:   #0077ed;
  --accent-bg:  rgba(0,113,227,.08);
  --border:     rgba(0,0,0,.08);
  --border-2:   rgba(0,0,0,.13);
  --r:          12px;
  --r-sm:       8px;
  --r-lg:       18px;
  --shadow-sm:  0 1px 4px rgba(0,0,0,.06);
  --shadow-md:  0 4px 20px rgba(0,0,0,.09);
  --font:       'DM Sans',-apple-system,BlinkMacSystemFont,sans-serif;
  --mono:       'DM Mono','SF Mono',monospace;
  --nav-h:      52px;
  --max:        1040px;
  --ease:       .22s cubic-bezier(.4,0,.2,1);
}

/* [BUG-1] @supports 必须在顶层 */
@supports (scrollbar-gutter: stable) {
  html { scrollbar-gutter: stable; }
}

html {
  scroll-padding-top: calc(var(--nav-h) + 8px);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
}

a   { color:inherit; text-decoration:none; }
img { display:block; max-width:100%; }
.container { max-width:var(--max); margin:0 auto; padding:0 20px; }

/* ═══════════════════════════════════════
   NAV  v8 — 彻底重写，零抖动
   ═══════════════════════════════════════ */

.nav {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--border);
  transition:box-shadow var(--ease);
}
.nav.scrolled { box-shadow:var(--shadow-sm); }

/* [BUG-5] gap:0，间距全部由子元素自己的 margin 管理 */
.nav-inner {
  max-width:var(--max); margin:0 auto; padding:0 20px;
  height:var(--nav-h); display:flex; align-items:center;
}

.nav-logo {
  display:flex; align-items:baseline; gap:1px; flex-shrink:0;
  font-size:17px; font-weight:700; letter-spacing:-.3px;
  margin-right:20px;
  transition:opacity var(--ease);
}
.nav-logo:hover { opacity:.8; }
.logo-mark { color:var(--accent); }

/* [BUG-3] gap 增大为 6px */
.nav-links {
  display:flex;
  align-items:center;
  gap:6px;
  flex:1;
}

/*
  [BUG-2] 零抖动最终方案：
  • 完全删除 ::before ghost（font-weight 从未改变，ghost 纯属多余）
  • display:flex + align-items:center：文字天然垂直居中
  • height:36px 固定高度：从物理上消除任何垂直方向的尺寸波动
  • font-weight:400 显式声明：永远不改变
*/
.nav-link {
  position:relative;
  display:flex;
  align-items:center;
  height:36px;
  padding:0 16px;
  border-radius:var(--r-sm);
  font-size:14px;
  font-weight:400;
  color:var(--text-2);
  white-space:nowrap;
  text-decoration:none;
  transition:color var(--ease), background var(--ease);
  -webkit-font-smoothing:antialiased;
}

/* .nav-label 是普通 span，不需要任何特殊样式 */
.nav-label { pointer-events:none; }

.nav-link:hover { color:var(--text); background:var(--bg-alt); }

/*
  [BUG-4] 活跃指示点正确实现：
  所有 .nav-link 均预先存在 ::after，初始 opacity:0（不可见）。
  .active 时 opacity:1 — 这样 transition 才能真正生效。
  若 ::after 不存在时切换为存在，transition 永远不会触发。
*/
.nav-link::after {
  content:'';
  position:absolute;
  bottom:5px; left:50%;
  transform:translateX(-50%);
  width:16px; height:2px;
  background:var(--accent);
  border-radius:1px;
  opacity:0;
  transition:opacity var(--ease);
}
.nav-link.active            { color:var(--accent); }
.nav-link.active::after     { opacity:1; }

/* ─── 导航下载按钮 ────────────────────── */
.nav-dl-btn {
  display:flex; align-items:center; gap:6px;
  height:34px; padding:0 16px;
  background:var(--accent); color:#fff;
  border-radius:980px; font-size:13px; font-weight:600;
  flex-shrink:0; white-space:nowrap;
  margin-left:12px;
  transition:background var(--ease), transform var(--ease), box-shadow var(--ease);
}
.nav-dl-btn:hover {
  background:var(--accent-h);
  transform:translateY(-1px);
  box-shadow:0 4px 14px rgba(0,113,227,.35);
}

/* ─── 汉堡按钮 ───────────────────────── */
.nav-hamburger {
  display:none; flex-direction:column; justify-content:center; gap:5px;
  background:none; border:none; cursor:pointer;
  padding:6px; margin-left:auto;
  width:36px; height:36px; border-radius:var(--r-sm);
  flex-shrink:0;
  transition:background var(--ease);
}
.nav-hamburger:hover { background:var(--bg-alt); }
.nav-hamburger span {
  display:block; width:20px; height:2px;
  background:var(--text); border-radius:2px;
  transition:transform var(--ease), opacity var(--ease);
  transform-origin:center;
}
.nav-hamburger.is-open span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity:0; transform:scaleX(0); }
.nav-hamburger.is-open span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

/* ─── 移动端菜单 ─────────────────────── */
.nav-mobile {
  display:flex; flex-direction:column;
  overflow:hidden; max-height:0;
  padding:0 20px;
  background:rgba(255,255,255,.97);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-top:1px solid transparent;
  transition:max-height .3s cubic-bezier(.4,0,.2,1),
             border-top-color .22s ease,
             padding-bottom .3s cubic-bezier(.4,0,.2,1);
}
.nav-mobile.open {
  max-height:480px;
  border-top-color:var(--border);
  padding-bottom:16px;
}
.nav-mobile-link {
  display:block; padding:12px 0;
  font-size:15px; color:var(--text);
  border-bottom:1px solid var(--border);
  transition:color var(--ease);
}
.nav-mobile-link:last-child { border-bottom:none; }
.nav-mobile-link:hover { color:var(--accent); }
.nav-mobile-dl { color:var(--accent); font-weight:600; }

/* ─── 按钮 ───────────────────────────── */
.btn {
  display:inline-flex; align-items:center; justify-content:center;
  padding:10px 20px; border-radius:980px;
  font-size:14px; font-weight:500;
  transition:background var(--ease), transform var(--ease), box-shadow var(--ease);
  cursor:pointer; border:none; white-space:nowrap;
}
.btn-ghost { background:var(--bg-alt); color:var(--text); }
.btn-ghost:hover { background:#e8e8ed; transform:translateY(-1px); }

.btn-dl-hero {
  display:inline-flex; align-items:center; gap:14px;
  padding:14px 24px;
  background:var(--accent); color:#fff;
  border-radius:var(--r-lg); font-size:15px; font-weight:600;
  transition:background var(--ease), transform var(--ease), box-shadow var(--ease);
  box-shadow:0 4px 20px rgba(0,113,227,.3);
}
.btn-dl-hero:hover {
  background:var(--accent-h); transform:translateY(-2px);
  box-shadow:0 8px 28px rgba(0,113,227,.42);
}
.btn-dl-icon {
  width:38px; height:38px; border-radius:9px;
  background:rgba(255,255,255,.2);
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}
.btn-dl-main { display:block; font-size:15px; font-weight:600; }
.btn-dl-sub  { display:block; font-size:12px; font-weight:400; opacity:.72; margin-top:1px; }

.btn-dl-card {
  display:flex; align-items:center; justify-content:center; gap:8px;
  padding:12px 20px; background:var(--accent); color:#fff;
  border-radius:var(--r); font-size:14px; font-weight:600;
  transition:background var(--ease), transform var(--ease), box-shadow var(--ease);
  box-shadow:0 4px 16px rgba(0,113,227,.38);
}
.btn-dl-card:hover {
  background:var(--accent-h); transform:translateY(-1px);
  box-shadow:0 6px 22px rgba(0,113,227,.5);
}

/* ─── Section ─────────────────────────── */
.section { padding:80px 0; }
.section-label {
  font-size:12px; font-weight:600; color:var(--accent);
  text-transform:uppercase; letter-spacing:.08em; margin-bottom:10px;
}
.section-title {
  font-size:clamp(26px,3.8vw,36px); font-weight:700;
  letter-spacing:-.03em; line-height:1.15; margin-bottom:14px;
}
.section-desc {
  font-size:16px; color:var(--text-2); line-height:1.65;
  max-width:520px; margin-bottom:32px;
}

/* ─── Hero ────────────────────────────── */
.hero {
  position:relative;
  padding:calc(var(--nav-h) + 72px) 0 88px;
  text-align:center; overflow:hidden;
}
.hero-bg { position:absolute; inset:0; pointer-events:none; overflow:hidden; }
.hero-grid {
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(0,113,227,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,113,227,.04) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,black 30%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,black 30%,transparent 80%);
}
.hero-glow {
  position:absolute; top:-20%; left:50%; transform:translateX(-50%);
  width:700px; height:450px;
  background:radial-gradient(ellipse,rgba(0,113,227,.07) 0%,transparent 70%);
}
.hero-eyebrow { margin-bottom:22px; animation:fadeUp .6s ease both; }
.badge {
  display:inline-flex; align-items:center;
  padding:4px 13px;
  background:var(--accent-bg); color:var(--accent);
  border-radius:980px; font-size:12px; font-weight:500;
  border:1px solid rgba(0,113,227,.14); font-family:var(--mono);
}
.hero-title {
  display:flex; flex-direction:column;
  font-size:clamp(48px,8vw,84px);
  font-weight:700; letter-spacing:-.04em; line-height:1.05; margin-bottom:10px;
}
.hero-line { display:block; animation:fadeUp .6s ease both; }
.hero-line:nth-child(1) { animation-delay:.1s; }
.hero-line:nth-child(2) { animation-delay:.18s; }
.hero-title .accent { color:var(--accent); }
.hero-sub {
  font-size:14px; color:var(--text-3); font-family:var(--mono);
  letter-spacing:.02em; margin-bottom:14px;
  animation:fadeUp .6s ease both .25s;
}
.hero-desc  { font-size:18px; color:var(--text-2); margin-bottom:32px; animation:fadeUp .6s ease both .3s; }
.hero-cta-group {
  display:flex; gap:12px; justify-content:center;
  flex-wrap:wrap; margin-bottom:52px;
  animation:fadeUp .6s ease both .38s;
}
.hero-stats {
  display:inline-flex; align-items:center; gap:28px;
  padding:16px 32px;
  background:var(--bg-alt); border-radius:var(--r-lg); border:1px solid var(--border);
  animation:fadeUp .6s ease both .46s;
}
.stat-num   { font-size:22px; font-weight:700; color:var(--accent); font-family:var(--mono); letter-spacing:-.03em; }
.stat-label { font-size:11px; color:var(--text-2); margin-top:2px; }
.stat-sep   { width:1px; height:32px; background:var(--border-2); flex-shrink:0; }

/* ─── Pillars ─────────────────────────── */
.pillars-section { background:var(--bg-alt); padding:64px 0; }
.pillars-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.pillar {
  background:var(--bg); border:1px solid var(--border); border-radius:var(--r);
  padding:28px 24px; transition:box-shadow var(--ease),transform var(--ease);
}
.pillar:hover { box-shadow:var(--shadow-md); transform:translateY(-2px); }
.pillar-icon {
  width:46px; height:46px; border-radius:11px; background:var(--accent-bg);
  display:flex; align-items:center; justify-content:center; margin-bottom:14px;
}
.pillar h3 { font-size:17px; font-weight:600; letter-spacing:-.01em; margin-bottom:7px; }
.pillar p  { font-size:14px; color:var(--text-2); line-height:1.6; }

/* ─── Features list ───────────────────── */
.features-section { background:var(--bg); }
.features-inner { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:start; }
.features-list  { display:flex; flex-direction:column; }
.feat-row { display:flex; gap:14px; align-items:flex-start; padding:16px 0; border-bottom:1px solid var(--border); }
.feat-row:last-child { border-bottom:none; }
.feat-dot  { width:7px; height:7px; border-radius:50%; background:var(--accent); flex-shrink:0; margin-top:7px; }
.feat-name { font-size:14px; font-weight:600; margin-bottom:2px; }
.feat-note { font-size:13px; color:var(--text-2); }

/* ─── Download Strip ──────────────────── */
.dl-strip { background:var(--bg-alt); padding:48px 0; }
.dl-strip-inner {
  display:flex; align-items:center; justify-content:space-between;
  gap:32px; flex-wrap:wrap;
}
.dl-strip-left h2 { font-size:24px; font-weight:700; letter-spacing:-.03em; margin-bottom:4px; }
.dl-strip-left p  { font-size:14px; color:var(--text-2); }
.dl-strip-right   { display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.dl-ver-badge {
  display:flex; flex-direction:column; padding:10px 16px;
  background:var(--bg); border:1px solid var(--border); border-radius:var(--r); font-family:var(--mono);
}
.dl-ver-label { font-size:10px; color:var(--text-3); text-transform:uppercase; letter-spacing:.06em; }
.dl-ver-val   { font-size:14px; font-weight:600; color:var(--text); margin-top:2px; }

/* ─── 内页 Hero ──────────────────────── */
.page-hero {
  padding:calc(var(--nav-h) + 52px) 0 52px;
  text-align:center; background:var(--bg-alt); border-bottom:1px solid var(--border);
}
.page-hero h1 { font-size:clamp(30px,5vw,48px); font-weight:700; letter-spacing:-.04em; margin-bottom:12px; }
.page-hero p  { font-size:16px; color:var(--text-2); max-width:520px; margin:0 auto; line-height:1.65; }

/* ─── Footer ─────────────────────────── */
.footer { background:var(--bg-alt); border-top:1px solid var(--border); padding:48px 0 28px; }
.footer-inner { display:flex; gap:48px; justify-content:space-between; margin-bottom:32px; flex-wrap:wrap; }
.footer-brand { display:flex; flex-direction:column; }
.footer-tagline { margin-top:10px; font-size:13px; color:var(--text-2); line-height:1.7; }
.footer-links { display:flex; gap:40px; flex-wrap:wrap; }
.footer-col { display:flex; flex-direction:column; gap:9px; }
.footer-col-title { font-size:11px; font-weight:600; color:var(--text); text-transform:uppercase; letter-spacing:.08em; margin-bottom:2px; }
.footer-col a { display:block; font-size:13px; color:var(--text-2); transition:color var(--ease); }
.footer-col a:hover { color:var(--accent); }
.footer-bottom {
  display:flex; justify-content:space-between; align-items:center;
  padding-top:20px; border-top:1px solid var(--border);
  font-size:11px; color:var(--text-3); flex-wrap:wrap; gap:8px;
}

/* ─── 动画 ───────────────────────────── */
@keyframes fadeUp {
  from { opacity:0; transform:translateY(18px); }
  to   { opacity:1; transform:translateY(0); }
}
.reveal {
  opacity:0; transform:translateY(20px);
  transition:opacity .5s ease, transform .5s ease;
  will-change:transform, opacity;
}
.reveal.visible { opacity:1; transform:translateY(0); }

/* ─── Focus ──────────────────────────── */
:focus-visible { outline:2px solid var(--accent); outline-offset:2px; border-radius:var(--r-sm); }

/* ═══════════════════════════════════════
   内页组件
   ═══════════════════════════════════════ */

.feat-cards { display:grid; grid-template-columns:repeat(2,1fr); gap:14px; }
.feat-card {
  background:var(--bg); border:1px solid var(--border); border-radius:var(--r);
  padding:26px; transition:box-shadow var(--ease),transform var(--ease);
}
.feat-card:hover { box-shadow:var(--shadow-md); transform:translateY(-2px); }
.feat-card-icon { width:44px; height:44px; border-radius:10px; background:var(--accent-bg); display:flex; align-items:center; justify-content:center; margin-bottom:14px; }
.feat-card h3 { font-size:16px; font-weight:600; letter-spacing:-.01em; margin-bottom:7px; }
.feat-card p  { font-size:14px; color:var(--text-2); line-height:1.6; }
.p0-label { font-size:10px; font-weight:700; color:var(--accent); text-transform:uppercase; letter-spacing:.08em; margin-bottom:7px; font-family:var(--mono); }

.raid-wrap  { overflow-x:auto; border-radius:var(--r); border:1px solid var(--border); }
.raid-table { width:100%; border-collapse:collapse; background:var(--bg); font-size:14px; }
.raid-table thead { background:var(--bg-alt); border-bottom:1px solid var(--border); }
.raid-table th { padding:12px 18px; text-align:left; font-size:11px; font-weight:600; color:var(--text-2); text-transform:uppercase; letter-spacing:.06em; }
.raid-table td { padding:12px 18px; border-bottom:1px solid var(--border); }
.raid-table tbody tr:last-child td { border-bottom:none; }
.raid-table tbody tr:hover { background:#fafafa; }
.rb       { display:inline-flex; align-items:center; gap:5px; padding:2px 9px; border-radius:980px; font-family:var(--mono); font-size:12px; font-weight:500; border:1px solid var(--border); background:var(--bg-alt); }
.rb-red   { background:#fff0f0; color:#c62828; border-color:#f5c6c6; }
.rb-green { background:#f0f8f0; color:#1b6b1b; border-color:#b8dcb8; }
.rb-rec   { display:inline-block; padding:1px 6px; background:var(--accent); color:#fff; border-radius:980px; font-size:10px; font-family:var(--font); }
.row-rec  { background:linear-gradient(135deg,#f0f6ff,#fff); }

.disk-req-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-top:32px; }
.disk-req-card {
  background:var(--bg); border:1px solid var(--border); border-radius:var(--r);
  padding:22px 20px; transition:box-shadow var(--ease),transform var(--ease);
}
.disk-req-card:hover { box-shadow:var(--shadow-md); transform:translateY(-2px); }
.disk-req-card.req-must { border-color:rgba(0,113,227,.25); background:linear-gradient(145deg,#fff,#f0f6ff); }
.disk-req-card.req-warn { border-color:rgba(198,40,40,.2); background:linear-gradient(145deg,#fff,#fff5f5); }
.disk-req-icon { width:40px; height:40px; border-radius:10px; background:var(--accent-bg); display:flex; align-items:center; justify-content:center; margin-bottom:13px; }
.disk-req-card.req-warn .disk-req-icon { background:rgba(198,40,40,.08); }
.disk-req-title { font-size:14px; font-weight:600; letter-spacing:-.01em; margin-bottom:6px; }
.disk-req-desc  { font-size:13px; color:var(--text-2); line-height:1.6; }
.disk-req-badge { display:inline-block; padding:2px 8px; border-radius:980px; font-size:10px; font-weight:700; margin-bottom:10px; font-family:var(--mono); text-transform:uppercase; letter-spacing:.04em; }
.badge-must { background:var(--accent-bg); color:var(--accent); }
.badge-warn { background:rgba(198,40,40,.1); color:#c62828; }
.badge-tip  { background:#e8f5e9; color:#1b6b1b; }

.hw-section { margin-bottom:52px; }
.hw-section:last-child { margin-bottom:0; }
.hw-hdr { display:flex; align-items:center; gap:14px; margin-bottom:18px; }
.hw-hdr-icon { width:40px; height:40px; border-radius:10px; background:var(--accent-bg); display:flex; align-items:center; justify-content:center; flex-shrink:0; }
.hw-hdr-title { font-size:19px; font-weight:600; letter-spacing:-.02em; }
.hw-hdr-note  { font-size:13px; color:var(--text-2); margin-top:2px; }
.hw-cards { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.hw-card {
  background:var(--bg); border:1px solid var(--border); border-radius:var(--r);
  padding:20px; transition:box-shadow var(--ease),transform var(--ease);
}
.hw-card:hover { box-shadow:var(--shadow-md); transform:translateY(-2px); }
.hw-card-rec  { border-color:rgba(0,113,227,.22); background:linear-gradient(145deg,#fff,#f0f6ff); }
.hw-tag { display:inline-block; padding:2px 8px; border-radius:980px; font-size:10px; font-weight:600; margin-bottom:9px; font-family:var(--mono); }
.tag-r { background:var(--accent); color:#fff; }
.tag-b { background:#e8f5e9; color:#1b6b1b; }
.tag-p { background:#f3e5f5; color:#6a1b9a; }
.tag-o { background:#fff3e0; color:#e65100; }
.hw-card-name { font-size:14px; font-weight:600; margin-bottom:3px; }
.hw-card-spec { font-size:11px; color:var(--accent); font-family:var(--mono); margin-bottom:7px; }
.hw-card-desc { font-size:13px; color:var(--text-2); line-height:1.55; }
.hw-card-note { margin-top:9px; padding:7px 9px; background:var(--bg-alt); border-radius:var(--r-sm); font-size:12px; color:var(--text-2); }

.hw-tier-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-bottom:48px; }
.hw-tier-card { border:1.5px solid var(--border); border-radius:var(--r); padding:22px 20px; transition:box-shadow var(--ease),border-color var(--ease); }
.hw-tier-card:hover { box-shadow:var(--shadow-md); border-color:var(--accent); }
.hw-tier-card.tier-highlight { border-color:rgba(0,113,227,.3); background:linear-gradient(145deg,#fff,#f0f6ff); }
.hw-tier-badge { display:inline-block; padding:3px 10px; border-radius:980px; font-size:11px; font-weight:600; margin-bottom:12px; }
.tb-home   { background:#e8f5e9; color:#1b6b1b; }
.tb-pro    { background:var(--accent-bg); color:var(--accent); }
.tb-server { background:#f3e5f5; color:#6a1b9a; }
.hw-tier-card h3 { font-size:16px; font-weight:600; margin-bottom:8px; letter-spacing:-.01em; }
.hw-tier-card p  { font-size:13px; color:var(--text-2); line-height:1.6; margin-bottom:12px; }
.hw-tier-card ul { list-style:none; display:flex; flex-direction:column; gap:5px; }
.hw-tier-card ul li { font-size:12px; color:var(--text-2); display:flex; gap:6px; align-items:flex-start; }
.hw-tier-card ul li::before { content:'✓'; color:var(--accent); flex-shrink:0; font-weight:700; font-size:11px; margin-top:1px; }

.rule-grid  { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; }
.rule-card  { background:var(--bg); border:1px solid var(--border); border-radius:var(--r); padding:20px; }
.rule-num   { font-size:30px; font-weight:700; color:var(--accent); font-family:var(--mono); opacity:.22; margin-bottom:8px; }
.rule-title { font-size:14px; font-weight:600; margin-bottom:5px; }
.rule-desc  { font-size:13px; color:var(--text-2); line-height:1.55; }

.info-box {
  border-radius:var(--r); padding:16px 20px; font-size:13px; line-height:1.65;
  display:flex; gap:12px; align-items:flex-start;
}
.info-box-icon { flex-shrink:0; font-size:16px; margin-top:1px; }
.info-box.warn-box  { background:#fff8e1; border:1px solid #ffe082; color:#5d4037; }
.info-box.warn-box strong { color:#3e2723; }
.info-box.tip-box   { background:#e8f5e9; border:1px solid #a5d6a7; color:#2e7d32; }
.info-box.tip-box strong { color:#1b5e20; }
.info-box.info-note { background:var(--accent-bg); border:1px solid rgba(0,113,227,.2); color:var(--text-2); }
.info-box.info-note strong { color:var(--accent); }
.warn-box:not(.info-box) { background:#fff8e1; border:1px solid #ffe082; border-radius:var(--r); padding:14px 18px; font-size:13px; color:#5d4037; line-height:1.6; }
.warn-box:not(.info-box) strong { color:#3e2723; }

/* ─── 文档布局 ───────────────────────── */
.docs-wrap { display:grid; grid-template-columns:220px 1fr; gap:40px; padding:40px 0 80px; }
.docs-sidebar { position:sticky; top:calc(var(--nav-h) + 20px); height:fit-content; }
.sb-section { margin-bottom:22px; }
.sb-title { font-size:10px; font-weight:700; color:var(--text-3); text-transform:uppercase; letter-spacing:.1em; margin-bottom:6px; padding:0 6px; }
.sb-link {
  display:flex; align-items:center; gap:8px;
  padding:6px; border-radius:var(--r-sm);
  font-size:13px; color:var(--text-2);
  transition:color var(--ease),background var(--ease);
}
.sb-link:hover { color:var(--text); background:var(--bg-alt); }
.sb-link.active { color:var(--accent); background:var(--accent-bg); font-weight:500; }
.sb-dot   { width:6px; height:6px; border-radius:50%; flex-shrink:0; }
.dot-ok   { background:#30d158; }
.dot-wip  { background:#ff9f0a; }
.dot-todo { background:var(--border-2); }
.doc-section { margin-bottom:52px; }
.doc-section:last-child { margin-bottom:0; }
.doc-hdr { display:flex; align-items:center; gap:12px; padding-bottom:14px; margin-bottom:18px; border-bottom:1px solid var(--border); flex-wrap:wrap; }
.doc-hdr-icon { width:36px; height:36px; border-radius:8px; background:var(--accent-bg); display:flex; align-items:center; justify-content:center; flex-shrink:0; }
.doc-hdr-title { font-size:19px; font-weight:600; letter-spacing:-.02em; }
.doc-badge { display:inline-flex; padding:2px 8px; border-radius:980px; font-size:10px; font-weight:600; margin-left:6px; }
.db-ok   { background:#e8f5e9; color:#1b6b1b; }
.db-wip  { background:#fff3e0; color:#e65100; }
.db-todo { background:var(--bg-alt); color:var(--text-2); }
.doc-cards { display:grid; grid-template-columns:repeat(2,1fr); gap:10px; margin-top:16px; }
.doc-card {
  background:var(--bg); border:1px solid var(--border); border-radius:var(--r-sm);
  padding:16px 18px; display:flex; gap:12px;
  transition:box-shadow var(--ease),border-color var(--ease);
}
.doc-card:hover { box-shadow:var(--shadow-sm); border-color:var(--accent); }
.dc-title { font-size:13px; font-weight:600; margin-bottom:2px; }
.dc-desc  { font-size:12px; color:var(--text-2); line-height:1.5; }
.dc-meta  { margin-top:6px; font-size:11px; color:var(--text-3); font-family:var(--mono); }
.toc-list { display:flex; flex-direction:column; }
.toc-item { display:flex; gap:14px; align-items:flex-start; padding:14px 0; border-bottom:1px solid var(--border); }
.toc-item:first-child { padding-top:0; }
.toc-item:last-child  { border-bottom:none; padding-bottom:0; }
.toc-num  { font-family:var(--mono); font-size:11px; color:var(--accent); font-weight:600; min-width:36px; margin-top:2px; }
.toc-name { font-size:14px; font-weight:600; margin-bottom:2px; }
.toc-desc { font-size:13px; color:var(--text-2); line-height:1.5; }

/* ─── 关于页 ─────────────────────────── */
.about-grid { display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start; }
.about-text h2 { font-size:30px; font-weight:700; letter-spacing:-.03em; margin-bottom:18px; }
.about-text p  { font-size:15px; color:var(--text-2); line-height:1.75; margin-bottom:14px; }
.about-text p:last-child { margin-bottom:0; }
.about-text strong { color:var(--text); font-weight:600; }
.quote-block { background:var(--bg-alt); border-left:3px solid var(--accent); border-radius:0 var(--r-sm) var(--r-sm) 0; padding:16px 18px; margin-bottom:12px; }
.quote-block:last-child { margin-bottom:0; }
.quote-block p { font-size:15px; font-style:italic; color:var(--text); line-height:1.65; font-weight:300; }
.quote-author  { margin-top:7px; font-size:11px; color:var(--text-3); font-family:var(--mono); }
.values-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.val-card  { background:var(--bg); border:1px solid var(--border); border-radius:var(--r); padding:24px; }
.val-num   { font-size:32px; font-weight:700; color:var(--accent); font-family:var(--mono); opacity:.2; margin-bottom:10px; }
.val-title { font-size:16px; font-weight:600; margin-bottom:7px; }
.val-desc  { font-size:13px; color:var(--text-2); line-height:1.6; }
.choice-list { display:flex; flex-direction:column; }
.choice-item { display:grid; grid-template-columns:140px 1fr; gap:28px; padding:22px 0; border-bottom:1px solid var(--border); align-items:start; }
.choice-item:first-child { padding-top:0; }
.choice-item:last-child  { border-bottom:none; padding-bottom:0; }
.choice-tech  { font-size:14px; font-weight:600; font-family:var(--mono); color:var(--accent); margin-top:2px; }
.choice-ttl   { font-size:14px; font-weight:600; margin-bottom:5px; }
.choice-desc  { font-size:13px; color:var(--text-2); line-height:1.65; }

/* ═══════════════════════════════════════
   响应式
   ═══════════════════════════════════════ */
@media (max-width:900px) {
  .nav-links, .nav-dl-btn { display:none; }
  .nav-hamburger { display:flex; }
  .pillars-grid { grid-template-columns:1fr; }
  .features-inner { grid-template-columns:1fr; gap:36px; }
  .feat-cards { grid-template-columns:1fr; }
  .disk-req-grid { grid-template-columns:1fr; }
  .hw-cards { grid-template-columns:repeat(2,1fr); }
  .hw-tier-grid { grid-template-columns:1fr; }
  .rule-grid { grid-template-columns:repeat(2,1fr); }
  .docs-wrap { grid-template-columns:1fr; }
  .docs-sidebar { display:none; }
  .doc-cards { grid-template-columns:1fr; }
  .about-grid { grid-template-columns:1fr; gap:36px; }
  .values-grid { grid-template-columns:1fr; }
  .choice-item { grid-template-columns:1fr; gap:6px; }
  .dl-strip-inner { flex-direction:column; align-items:flex-start; }
  .footer-inner { flex-direction:column; gap:24px; }
}
@media (max-width:600px) {
  .section { padding:56px 0; }
  .hero { padding-bottom:60px; }
  .hero-title { font-size:42px; }
  .hero-desc { font-size:16px; }
  .hero-stats { flex-direction:column; gap:14px; padding:16px 24px; }
  .stat-sep { width:40px; height:1px; }
  .btn-dl-hero { width:100%; max-width:320px; justify-content:center; }
  .hero-cta-group { flex-direction:column; align-items:center; }
  .hw-cards { grid-template-columns:1fr; }
  .rule-grid { grid-template-columns:1fr; }
  .footer-bottom { flex-direction:column; text-align:center; }
  .dl-strip-right { flex-direction:column; width:100%; }
  .btn-dl-card { width:100%; justify-content:center; }
}