/* AI Rec Immunity — 悬浮顶栏 + 居中内容 + 深色 hero + 浅色卡片 */
:root {
  --paper: #f4f4f1;
  --card: #ffffff;
  --ink: #1c1c1a;
  --ink-2: #6b6b66;
  --line: #e4e4df;
  --accent: #2f7d5c;
  --accent-ink: #ffffff;
  --danger: #b3402e;
  --radius: 0;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-padding-top: 72px; }
@font-face {
  font-family: 'Newsreader';
  src: url('fonts/Newsreader-var.ttf') format('truetype-variations');
  font-weight: 300 800;
  font-display: swap;
}

body {
  background: var(--paper); color: var(--ink);
  font: 16px/1.7 "SF Pro Display", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0.01em;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ 悬浮顶栏 ============ */
.topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; gap: 28px;
  height: 56px; padding: 0 24px;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}
.topnav.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}
.topnav .brand { font-weight: 600; font-size: 15px; color: var(--ink); letter-spacing: 0.02em; }
.topnav .brand:hover { text-decoration: none; }
.topnav .links { display: flex; gap: 4px; margin-left: 8px; }
.topnav .links a {
  padding: 6px 12px; border-radius: 2px; font-size: 14px;
  color: var(--ink-2);
}
.topnav .links a:hover { color: var(--ink); background: rgba(0,0,0,0.04); text-decoration: none; }
.topnav .links a.active { color: var(--ink); background: rgba(47, 125, 92, 0.12); font-weight: 500; }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.btn-login {
  padding: 7px 16px; font-size: 13px; color: var(--ink-2); border-radius: 2px;
}
.btn-login:hover { color: var(--ink); background: rgba(0,0,0,0.04); text-decoration: none; }
.btn-register {
  padding: 8px 18px; font-size: 13px; font-weight: 500;
  background: var(--ink); color: var(--paper); border-radius: 2px;
}
.btn-register:hover { background: var(--accent); color: var(--accent-ink); text-decoration: none; }
.lang-btn {
  padding: 5px 14px; font-size: 12px; cursor: pointer;
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 2px;
}
.lang-btn:hover { color: var(--ink); border-color: var(--ink); }

/* ============ 内容区 ============ */
.page-body { max-width: 940px; margin: 0 auto; padding: 88px 24px 48px; }
.page { display: block; }
body.routed .page { display: none; }
body.routed .page.active { display: block; animation: fadeUp 0.28s ease-out; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ============ 首页暗色 hero ============ */
.hero-dark {
  position: relative; overflow: hidden;
  width: 100vw; margin-left: calc(50% - 50vw);
  min-height: calc(100vh - 56px);
  display: flex; align-items: center;
  background: radial-gradient(1200px 500px at 70% -10%, #16211c 0%, #0b0d12 55%, #08090d 100%);
  color: #e9edf3;
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-dark-inner { position: relative; z-index: 1; padding: 96px 40px 88px; text-align: center; width: 100%; }
.hero-kicker { font-size: 13px; letter-spacing: 0.2em; text-transform: uppercase; color: #6fce9f; margin-bottom: 26px; }
.hero-dark h1 {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 38px; font-weight: 600; letter-spacing: -0.02em;
  line-height: 1.3; margin: 0 auto 22px; color: #f4f6f9; max-width: 640px;
}
.hero-dark p { color: #9aa4b5; font-size: 16px; max-width: 520px; margin: 0 auto; }
.hero-actions { margin-top: 36px; display: flex; gap: 14px; justify-content: center; }
.pill {
  display: inline-block; padding: 13px 30px; border-radius: 2px;
  font-size: 14px; font-weight: 500; letter-spacing: 0.03em; border: 0;
}
.pill:hover { text-decoration: none; }
.pill-primary { background: #2f7d5c; color: #fff; }
.pill-primary:hover { background: #3a9a72; }
.pill-ghost { background: transparent; color: #c8d0dc; border: 1px solid #3a4354; }
.pill-ghost:hover { border-color: #6fce9f; color: #6fce9f; }
@media (max-width: 640px) {
  .hero-dark h1 { font-size: 28px; }
  .hero-dark-inner { padding: 64px 22px 72px; }
  .hero-actions { flex-direction: column; align-items: center; }
}

/* ============ 浅色卡片分区（替代细线） ============ */
.card {
  background: var(--card); border-radius: 0;
  border: 0;
  box-shadow: 0 1px 3px rgba(28,28,26,0.05), 0 8px 24px rgba(28,28,26,0.05);
  padding: 32px; margin: 22px 0;
}
.card h2 {
  font-size: 13px; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-2); margin-bottom: 18px;
}
.card .desc { color: var(--ink-2); font-size: 15px; margin-bottom: 16px; }

/* 标题区（非首页） */
.page-hero { padding: 24px 0 8px; }
.page-hero h1 { font-family: 'Newsreader', Georgia, serif; font-size: 36px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 14px; }
.page-hero p { color: var(--ink-2); font-size: 16px; max-width: 560px; }

/* 统计 */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 24px; }
.stat .num { font-size: 38px; font-weight: 300; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat .label { color: var(--ink-2); font-size: 13px; margin-top: 2px; }

/* 按钮与表单 */
button, .btn {
  padding: 12px 22px; border: 0; border-radius: 2px; cursor: pointer;
  background: var(--ink); color: var(--paper); font-size: 14px; font-weight: 500;
}
button:hover, .btn:hover { background: var(--accent); color: var(--accent-ink); text-decoration: none; }
button.ghost { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
button.ghost:hover { background: var(--ink); color: var(--paper); }
a.dl-btn {
  display: inline-block; padding: 13px 26px; border-radius: 2px;
  background: var(--ink); color: var(--paper); font-size: 14px; font-weight: 500;
}
a.dl-btn:hover { background: var(--accent); color: var(--accent-ink); text-decoration: none; }

form.stack { display: grid; gap: 18px; }
form.stack label { font-size: 14px; color: var(--ink-2); display: grid; gap: 8px; }
form.stack input, form.stack textarea, form.stack select {
  padding: 11px 13px; border-radius: 2px; border: 1px solid var(--line);
  background: #fff; color: var(--ink); font-size: 15px; width: 100%;
}
form.stack input:focus, form.stack textarea:focus { border-color: var(--ink); outline: none; }
form.stack textarea { min-height: 110px; resize: vertical; }
form.stack button { justify-self: start; }

.result { margin-top: 14px; padding: 12px 0; font-size: 15px; display: none; }
.result.show { display: block; }
.result.hit { color: var(--danger); }
.result.clean { color: var(--accent); }
.result.wl { color: var(--ink-2); }
.result .meta { color: var(--ink-2); font-size: 13px; margin-top: 4px; }

/* 步骤 */
.steps { display: grid; gap: 14px; counter-reset: s; }
.step { display: flex; gap: 14px; align-items: baseline; }
.step::before {
  counter-increment: s; content: counter(s, decimal-leading-zero);
  color: var(--accent); font-size: 13px; font-variant-numeric: tabular-nums;
  font-weight: 600; min-width: 24px;
}

pre {
  background: #10131a; color: #d7e0ea; border-radius: 2px;
  padding: 16px; overflow-x: auto; font-size: 13px; line-height: 1.6;
}
code { font-family: "SF Mono", "Cascadia Code", Consolas, monospace; }

table.plain { width: 100%; border-collapse: collapse; font-size: 14px; }
table.plain th {
  text-align: left; font-weight: 600; font-size: 12px; letter-spacing: 0.08em;
  color: var(--ink-2); text-transform: uppercase;
  padding: 0 14px 10px 0; border-bottom: 1px solid var(--ink);
}
table.plain td { padding: 10px 14px 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
table.plain tr:last-child td { border-bottom: 0; }

.notice { font-size: 13px; color: var(--ink-2); margin-top: 14px; }
.badge { display: inline-block; padding: 1px 8px; font-size: 12px; border: 1px solid var(--line); color: var(--ink-2); margin-left: 8px; border-radius: 2px; }
footer { color: var(--ink-2); font-size: 13px; padding: 32px 0 24px; text-align: center; }

/* 移动端 */
@media (max-width: 720px) {
  .topnav { gap: 12px; padding: 0 14px; }
  .topnav .links { overflow-x: auto; }
  .page-body { padding: 76px 16px 40px; }
}

/* 文档页子标签 */
.subnav { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0 20px; border-bottom: 1px solid var(--line); }
.subnav a { padding: 8px 14px; font-size: 14px; color: var(--ink-2); border-bottom: 2px solid transparent; }
.subnav a:hover { color: var(--ink); text-decoration: none; }
.subnav a.active { color: var(--ink); font-weight: 500; border-bottom-color: var(--accent); }
.hidden { display: none !important; }
.client-card .desc { margin-bottom: 14px; }

/* 复选框组：标签跟随输入框 */
.tag-row { display: flex; flex-wrap: wrap; gap: 14px; }
.tag-row label.cb { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; color: var(--ink); }
.tag-row input[type=checkbox] { width: 15px; height: 15px; margin: 0; accent-color: var(--accent); }