/* ============================================================
   FastPUB 统一前端门面 · 落地页主题（B+ 素雅宣纸 × AI 科技版）
   设计基准：web/preview/paper_B_ai.html（已拍板定型）
   行业锚点：宣纸米白底 + 极淡蓝网格；科技/AI 注入：电光蓝青点缀、数据辉光、
   AI 眉标/能力标签带/智能终端便签/深蓝渐变 CTA。无装饰性动画。
   原生 CSS，无框架；定义于 web/assets/styles.css
   ============================================================ */

:root {
  --paper: #faf8f3;          /* 宣纸米白 */
  --paper-2: #fdfcf9;        /* 卡片略亮 */
  --ink: #1d1f24;            /* 墨黑（正文） */
  --ink-2: #2a2d33;          /* 次级墨色 */
  --ink-soft: #55585f;       /* 浅墨（辅助文字） */
  --blue: #1f6feb;           /* 电光蓝（主点缀） */
  --blue-ink: #1857c4;       /* 蓝字深一档 */
  --teal: #0fb5a8;           /* 青绿（次点缀） */
  --grid: rgba(31, 111, 235, 0.045);   /* 极淡蓝网格 */
  --line: rgba(31, 111, 235, 0.16);    /* 细蓝线/边框 */
  --line-soft: rgba(31, 111, 235, 0.10);
  --glow: rgba(31, 111, 235, 0.18);    /* 蓝色辉光 */
  --glow-soft: rgba(31, 111, 235, 0.06);
  --cta-bg: linear-gradient(135deg, #101826, #1a2f4a);
  --radius: 12px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", "Fira Code", Consolas,
    "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background-color: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  /* 素雅宣纸 + 极淡网格底纹（再淡一档，不眼花） */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}

a { color: inherit; text-decoration: none; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 22px;
  padding: 16px clamp(18px, 4vw, 40px);
  background: rgba(250, 248, 243, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  display: block;
  width: 34px; height: 34px; border-radius: 8px;
  box-shadow: 0 0 0 4px rgba(31, 111, 235, 0.08);
}
.brand-mark.sm { width: 38px; height: 38px; }
.brand-name { font-weight: 800; letter-spacing: .3px; font-size: 16px; color: var(--ink); }
.brand-pill {
  display: inline-flex; align-items: center;
  font-size: 11px; color: var(--blue); font-weight: 600;
  padding: 2px 9px; border: 1px solid var(--blue); border-radius: 999px;
  background: rgba(31, 111, 235, 0.06);
}
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--ink-soft); font-size: 14px; transition: color .15s; }
.nav-links a:hover { color: var(--blue); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none;
  border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; }

.lang {
  display: inline-flex; align-items: center;
  background: rgba(31, 111, 235, 0.05); border: 1px solid var(--line); border-radius: 999px;
  padding: 2px;
}
.lang button {
  border: 0; background: transparent; color: var(--ink-soft); font-family: inherit;
  font-size: 12.5px; font-weight: 600; padding: 5px 10px; border-radius: 999px;
  cursor: pointer; transition: color .15s, background .15s;
}
.lang button.active { background: rgba(31, 111, 235, 0.12); color: var(--blue); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; border: 1.5px solid var(--ink); border-radius: 9px;
  padding: 9px 16px; font-size: 14px; font-weight: 600; cursor: pointer;
  font-family: inherit; white-space: nowrap; transition: background .15s, border-color .15s, color .15s, opacity .15s, transform .1s;
}
.btn svg { flex: none; }
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 7px 14px; font-size: 13.5px; border-radius: 8px; }
.btn-lg { padding: 11px 22px; font-size: 14.5px; border-radius: 10px; }
.btn-block { width: 100%; }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue);
  box-shadow: 0 6px 18px rgba(31, 111, 235, 0.25); }
.btn-primary:hover { background: var(--blue-ink); border-color: var(--blue-ink); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: rgba(31, 111, 235, 0.06); border-color: var(--blue); }
.btn-glass { background: rgba(255, 255, 255, 0.6); color: var(--ink); border-color: var(--line); }
.btn-glass:hover { background: rgba(31, 111, 235, 0.06); border-color: var(--blue); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr); gap: clamp(24px, 3.5vw, 52px);
  align-items: center;
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(40px, 5vw, 68px) clamp(18px, 4vw, 40px) clamp(48px, 7vw, 90px);
}
/* Hero 背景：斜向流光 + 点阵（静态无动画） */
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  overflow: hidden; pointer-events: none;
}
.hero-bg::before {
  content: ""; position: absolute; top: -30%; right: -10%; width: 70%; height: 160%;
  background: linear-gradient(115deg, transparent 40%, var(--glow) 50%, transparent 60%);
  filter: blur(8px); opacity: .5;
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(31, 111, 235, 0.10) 1px, transparent 1px);
  background-size: 18px 18px; opacity: .5;
}

.hero-copy, .code-card { min-width: 0; }
.hero-copy { text-align: left; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--ink-soft); margin-bottom: 18px;
}
.eyebrow .ai {
  display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid var(--blue); color: var(--blue);
  padding: 2px 9px; border-radius: 999px; letter-spacing: 1px;
  background: rgba(31, 111, 235, 0.06); text-transform: none;
}
.eyebrow .ai::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--blue);
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.18);
}
.eyebrow .accent { border: 1px solid var(--teal); color: var(--teal); padding: 2px 8px; border-radius: 4px; letter-spacing: 1px; text-transform: none; }

.hero-title {
  font-size: clamp(34px, 4.6vw, 54px); line-height: 1.15; font-weight: 800;
  letter-spacing: .5px; margin: 0 0 18px; color: var(--ink);
}
.hero-title .hl { background: linear-gradient(transparent 62%, rgba(31, 111, 235, 0.22) 62%); }
.hero-lead { color: var(--ink-2); font-size: clamp(15px, 1.5vw, 17px); max-width: 540px; margin: 0 0 12px; }
.hero-sub { color: var(--ink-soft); font-size: clamp(14px, 1.4vw, 15.5px); max-width: 540px; margin: 0 0 22px; }

/* AI 能力标签带 */
.ai-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 26px; }
.ai-tag {
  font-size: 12px; color: var(--blue); border: 1px solid var(--line);
  background: rgba(31, 111, 235, 0.04); padding: 4px 11px; border-radius: 999px;
}

.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* Hero 智能终端便签代码卡 */
.code-card {
  background: #fdfdff;
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 12px 34px rgba(31, 111, 235, 0.14), 0 0 0 4px rgba(31, 111, 235, 0.05);
  overflow: hidden;
}
.code-tabs { display: flex; gap: 18px; border-bottom: 1px solid var(--line); padding: 12px 16px 0; }
.code-tab {
  flex: none; border: 0; background: transparent; color: var(--ink-soft);
  padding: 0 0 8px; font-size: 12.5px; font-weight: 600; font-family: inherit;
  cursor: pointer; border-bottom: 2px solid transparent; transition: color .15s, border-color .15s;
}
.code-tab.active { color: var(--blue); border-bottom-color: var(--blue); }
.code-tab:hover:not(.active) { color: var(--ink-2); }
.code-frame { background: #fdfdff; }
.code-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-top: 1px dashed var(--line); }
.code-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--line-soft); }
.code-dot.red { background: #ff5f56; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #27c93f; }
.code-dot.b { background: var(--blue); box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.18); }
.code-copy {
  display: inline-flex; align-items: center; gap: 6px;
  margin-left: auto; padding: 6px 10px; border-radius: 8px;
  background: rgba(31, 111, 235, 0.06); border: 1px solid var(--line); color: var(--ink-soft);
  font-size: 12px; font-family: inherit; cursor: pointer; transition: .15s;
}
.code-copy:hover { color: var(--blue); background: rgba(31, 111, 235, 0.1); border-color: var(--blue); }
.code-panels { position: relative; }
.code-panel {
  margin: 0; padding: 16px 18px 18px; overflow-x: auto;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.85; color: var(--ink);
}
.code-panel[hidden] { display: none; }
.code-panel code { white-space: pre; }
.t-prompt { color: var(--blue); }
.t-cmd { color: var(--ink); }
.t-out { color: var(--ink-2); }
.t-dim { color: #9a948a; }
.t-ok { color: #1f9d55; }
.t-warn { color: var(--blue); font-weight: 600; }
.t-info { color: var(--blue); }
.t-pos { color: #9a948a; }
.cursor { display: inline-block; width: 7px; height: 14px; background: var(--blue);
  vertical-align: middle; margin-left: 2px; box-shadow: 0 0 6px rgba(31, 111, 235, 0.6); }

/* ---------- 通用 section ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(48px, 7vw, 84px) clamp(18px, 4vw, 40px); }
.section-alt {
  background: rgba(255, 255, 255, 0.45);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  max-width: none;
}
.section-alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section-head { max-width: 720px; margin: 0 auto clamp(32px, 4vw, 48px); text-align: center; }
.kicker {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .18em;
  text-transform: uppercase; color: var(--blue); margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(22px, 3vw, 32px); font-weight: 800; margin: 0 0 12px; letter-spacing: .3px; color: var(--ink); }
.section-lead { color: var(--ink-soft); font-size: 15px; margin: 0; }

/* ---------- Feature 网格 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.feature {
  background: rgba(255, 255, 255, 0.6); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: background .15s, border-color .15s, box-shadow .15s, transform .15s; min-width: 0;
}
.feature:hover { background: #fff; border-color: var(--line); box-shadow: 0 10px 26px rgba(31, 111, 235, 0.10); transform: translateY(-2px); }
.feature-ico {
  width: 46px; height: 46px; border-radius: 12px;
  background: rgba(31, 111, 235, 0.08); border: 1px solid rgba(31, 111, 235, 0.18);
  position: relative; flex: none; margin-bottom: 18px;
}
.feature-ico::after {
  content: ""; position: absolute; inset: 0; margin: auto;
  background: var(--blue); -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat;
  -webkit-mask-position: center; mask-position: center; -webkit-mask-size: 24px; mask-size: 24px;
}
.ico-kernel::after {
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><rect x='4' y='4' width='16' height='16' rx='2'></rect><rect x='9' y='9' width='6' height='6'></rect><path d='M15 2v2M15 20v2M2 15h2M2 9h2M20 15h2M20 9h2M9 2v2M9 20v2'></path></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><rect x='4' y='4' width='16' height='16' rx='2'></rect><rect x='9' y='9' width='6' height='6'></rect><path d='M15 2v2M15 20v2M2 15h2M2 9h2M20 15h2M20 9h2M9 2v2M9 20v2'></path></svg>");
}
.ico-plugins::after {
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z'></path><polyline points='3.27 6.96 12 12.01 20.73 6.96'></polyline><line x1='12' y1='22.08' x2='12' y2='12'></line></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z'></path><polyline points='3.27 6.96 12 12.01 20.73 6.96'></polyline><line x1='12' y1='22.08' x2='12' y2='12'></line></svg>");
}
.ico-config::after {
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='12' cy='12' r='3'></circle><path d='M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z'></path></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='12' cy='12' r='3'></circle><path d='M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z'></path></svg>");
}
.feature-kicker { font-size: 11.5px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--blue); margin-bottom: 8px; }
.feature h3 { font-size: 18px; margin: 0 0 8px; font-weight: 700; color: var(--ink); }
.feature p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.7; }

/* ---------- 能力矩阵 ---------- */
.cap-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.cap {
  background: rgba(255, 255, 255, 0.6); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; transition: background .15s, border-color .15s, box-shadow .15s, transform .15s;
}
.cap:hover { background: #fff; box-shadow: 0 10px 26px rgba(31, 111, 235, 0.10); transform: translateY(-2px); }
.cap-live { border-color: rgba(31, 111, 235, 0.4); box-shadow: 0 0 0 1px rgba(31, 111, 235, 0.12); }
.cap-no {
  display: grid; place-items: center; width: 46px; height: 46px; border-radius: 12px;
  font-weight: 800; font-size: 20px; color: #fff; background: var(--blue); margin-bottom: 16px;
}
.cap h3 { font-size: 18px; margin: 0 0 8px; color: var(--ink); }
.cap p { color: var(--ink-soft); font-size: 14px; margin: 0 0 16px; }
.cap-state { display: inline-block; font-size: 12px; padding: 4px 12px; border-radius: 999px; font-weight: 600; }
.state-plan { background: rgba(31, 111, 235, 0.05); color: var(--ink-soft); border: 1px solid var(--line); }
.state-on { background: var(--blue); color: #fff; border: 1px solid var(--blue); box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.12); }

/* ---------- 流程 ---------- */
.pipeline { text-align: center; }
.flow { display: flex; align-items: stretch; justify-content: center; gap: 0; flex-wrap: wrap; }
.flow-node {
  background: rgba(255, 255, 255, 0.6); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 24px; width: 220px; text-align: center; transition: background .15s, border-color .15s, box-shadow .15s;
  min-width: 0;
}
.flow-node:hover { background: #fff; box-shadow: 0 10px 26px rgba(31, 111, 235, 0.10); }
.flow-node-live { border-color: rgba(31, 111, 235, 0.4); box-shadow: 0 0 0 1px rgba(31, 111, 235, 0.12); }
.flow-ico { margin: 0 auto 14px; }
.flow-step { font-size: 12px; letter-spacing: 1px; color: var(--blue); font-weight: 700; }
.flow-name { font-size: 17px; font-weight: 700; margin: 4px 0 8px; color: var(--ink); }
.flow-node p { color: var(--ink-soft); font-size: 13px; margin: 0; }
.flow-arrow { align-self: center; width: 46px; height: 2px; position: relative;
  background: linear-gradient(90deg, var(--blue), var(--teal)); }
.flow-arrow::after { content: ""; position: absolute; right: -1px; top: -4px;
  border: 5px solid transparent; border-left-color: var(--teal); }
.flow-note { color: var(--ink-soft); font-size: 13.5px; margin-top: 28px; }

/* 流程图标（复用 mask） */
.flow-ico { width: 44px; height: 44px; border-radius: 12px; background: rgba(31, 111, 235, 0.08); border: 1px solid rgba(31, 111, 235, 0.18); position: relative; }
.flow-ico::after { content: ""; position: absolute; inset: 0; margin: auto; background: var(--blue); -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat; -webkit-mask-position: center; mask-position: center; -webkit-mask-size: 22px; mask-size: 22px; }
.ico-book::after {
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M4 19.5A2.5 2.5 0 0 1 6.5 17H20'/><path d='M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M4 19.5A2.5 2.5 0 0 1 6.5 17H20'/><path d='M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z'/></svg>");
}
.ico-scan::after {
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M3 7V5a2 2 0 0 1 2-2h2'/><path d='M17 3h2a2 2 0 0 1 2 2v2'/><path d='M21 17v2a2 2 0 0 1-2 2h-2'/><path d='M7 21H5a2 2 0 0 1-2-2v-2'/><line x1='3' y1='12' x2='21' y2='12'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M3 7V5a2 2 0 0 1 2-2h2'/><path d='M17 3h2a2 2 0 0 1 2 2v2'/><path d='M21 17v2a2 2 0 0 1-2 2h-2'/><path d='M7 21H5a2 2 0 0 1-2-2v-2'/><line x1='3' y1='12' x2='21' y2='12'/></svg>");
}
.ico-link::after {
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71'/><path d='M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71'/><path d='M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71'/></svg>");
}

/* ---------- 数据带 ---------- */
.stats {
  max-width: var(--maxw); margin: 0 auto; padding: 8px clamp(18px, 4vw, 40px) clamp(48px, 7vw, 90px);
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.stat { background: var(--paper); padding: 26px 14px; min-width: 0; }
.stat b { display: block; font-family: var(--mono); font-size: clamp(24px, 3.2vw, 34px); font-weight: 800;
  color: var(--blue); text-shadow: 0 0 12px rgba(31, 111, 235, 0.25); }
.stat span { color: var(--ink-soft); font-size: 13px; }

/* ---------- CTA ---------- */
.cta-block { text-align: center; }
.cta-card {
  background: var(--cta-bg); color: #eef3ff; border-radius: 16px;
  padding: clamp(36px, 5vw, 56px); box-shadow: 0 16px 40px rgba(16, 24, 38, 0.22);
}
.cta-card .kicker { color: #7fb0ff; margin-bottom: 10px; }
.cta-card h2 { font-size: clamp(21px, 2.8vw, 28px); margin: 0 0 12px; font-weight: 800; color: #fff; }
.cta-card p { color: #b9c6e0; font-size: 15px; margin: 0 0 26px; }
.cta-card .hero-cta { justify-content: center; }
.cta-card .btn-glass { color: #eef3ff; border-color: rgba(238, 243, 255, 0.5); background: rgba(255, 255, 255, 0.04); }
.cta-card .btn-glass:hover { background: rgba(255, 255, 255, 0.1); border-color: #eef3ff; }
.cta-card .btn-primary { background: #fff; color: var(--blue); border-color: #fff; box-shadow: 0 6px 18px rgba(255, 255, 255, 0.18); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 40px clamp(18px, 4vw, 40px) 30px;
  background: rgba(255, 255, 255, 0.4); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; display: flex; align-items: center;
  justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-sub { color: var(--ink-soft); font-size: 13px; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a { color: var(--ink-soft); font-size: 14px; transition: color .15s; }
.footer-links a:hover { color: var(--blue); }
.footer-copy { max-width: var(--maxw); margin: 22px auto 0; text-align: center;
  color: var(--ink-soft); font-size: 12.5px; }
.footer-copy a { color: inherit; text-decoration: underline;
  text-underline-offset: 2px; }
.footer-copy a:hover { color: var(--ink); }

/* ---------- 登录/注册 模态 ---------- */
.auth-overlay {
  position: fixed; inset: 0; z-index: 100; display: grid; place-items: center;
  background: rgba(20, 24, 38, 0.45);
  opacity: 1; transition: opacity .2s;
}
.auth-overlay[hidden] { display: none; }
.auth-overlay.closing { opacity: 0; }
.auth-modal {
  width: min(420px, 92vw); background: #fdfcf9;
  border: 1px solid var(--line); border-radius: 18px; padding: 30px 28px 24px;
  box-shadow: 0 24px 70px rgba(16, 24, 38, 0.3); position: relative;
}
.auth-close { position: absolute; top: 10px; right: 12px; z-index: 2;
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  background: none; border: 0; border-radius: 10px;
  color: var(--ink-soft); font-size: 24px; line-height: 1; cursor: pointer;
  transition: color .18s, background .18s; }
.auth-close:hover { color: var(--ink); background: rgba(31, 111, 235, 0.06); }
.auth-close:active { transform: scale(.92); }
.auth-head { text-align: center; margin-bottom: 22px; }
.auth-head .brand-mark { margin: 0 auto 12px; }
.auth-head h3 { margin: 0 0 6px; font-size: 19px; font-weight: 800; color: var(--ink); }
.auth-sub { margin: 0; color: var(--ink-soft); font-size: 13.5px; }
.auth-tabs { display: flex; background: rgba(31, 111, 235, 0.05); border: 1px solid var(--line);
  border-radius: 11px; padding: 4px; margin-bottom: 20px; }
.auth-tab { flex: 1; border: 0; background: none; color: var(--ink-soft); font-size: 14.5px;
  font-weight: 600; padding: 9px; border-radius: 8px; cursor: pointer; font-family: inherit; transition: .15s; }
.auth-tab.active { background: rgba(31, 111, 235, 0.12); color: var(--blue); box-shadow: 0 6px 18px rgba(31, 111, 235, 0.12); }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form[hidden] { display: none; }
.auth-form label { display: flex; flex-direction: column; gap: 7px; font-size: 13px; color: var(--ink-soft); }
.auth-form input {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 13px; color: var(--ink); font-size: 14.5px; font-family: inherit; transition: border-color .15s, box-shadow .15s;
}
.auth-form input::placeholder { color: #b3ada1; }
.auth-form input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.18); }
.auth-foot { text-align: center; color: var(--ink-soft); font-size: 12px; margin: 16px 0 0; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%) translateY(10px);
  background: #fdfcf9; border: 1px solid var(--line); color: var(--ink);
  padding: 13px 22px; border-radius: 12px; font-size: 14px; z-index: 200;
  box-shadow: 0 16px 40px rgba(16, 24, 38, 0.18); opacity: 0; transition: opacity .2s, transform .2s;
}
.toast[hidden] { display: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 滚动揭示（静态：无位移/淡入动画） ---------- */
.reveal { opacity: 1; transform: none; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .code-card { max-width: 620px; margin: 0 auto; width: 100%; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav.menu-open { background: rgba(250, 248, 243, 0.98); }
  .nav.menu-open .nav-links {
    display: flex; flex-direction: column; gap: 14px; position: absolute; top: 100%; left: 0;
    right: 0; background: rgba(250, 248, 243, 0.98); padding: 18px 24px; border-bottom: 1px solid var(--line);
  }
  .feature-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .brand-pill { display: none; }
  .lang { display: none; }
  .nav-actions .btn-sm { padding: 6px 10px; font-size: 12.5px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn-lg { width: 100%; }
  .stats { grid-template-columns: 1fr 1fr; }
  .flow-arrow { width: 2px; height: 30px; }
  .flow-arrow::after { right: -4px; top: auto; bottom: -1px; border: 5px solid transparent; border-top-color: var(--teal); }
}