/* =========================================================
   AI数派官网 v3 · 样式系统
   深色科技底 + 精细网格 + 辉光 + 等宽细节
   零外部依赖，可静态部署
   ========================================================= */

/* ============================================================
   主题 token：深色（默认）/ 浅色
   切换方式：<html data-theme="light"> / <html data-theme="dark">
   ============================================================ */
:root,
[data-theme="dark"] {
  /* 底色系 */
  --bg: #05070d;
  --bg-2: #080b14;
  --bg-panel: #0c101c;
  --bg-panel-2: #10151f;
  --line: rgba(120, 160, 255, 0.12);
  --line-soft: rgba(120, 160, 255, 0.07);
  /* 文本 */
  --fg: #eef2fb;
  --fg-muted: #98a4be;
  --fg-dim: #5f6b85;
  /* 品牌强调色 */
  --accent: #4d8dff;
  --accent-2: #35e3c4;
  --accent-glow: rgba(77, 141, 255, 0.35);
  --grad: linear-gradient(120deg, #5b9cff 0%, #35e3c4 100%);
  /* 状态 */
  --ok: #35e3c4;
  --warn: #f5b544;
  --run: #4d8dff;
  /* 网格底纹 */
  --grid-color: rgba(120, 160, 255, 0.07);
  /* console / card */
  --console-bg: rgba(0, 0, 0, 0.35);
  --console-border: rgba(120, 160, 255, 0.07);
  --field-icon: rgba(255, 255, 255, 0.04);
}

[data-theme="light"] {
  /* 底色系 */
  --bg: #f4f6fb;
  --bg-2: #edf0f7;
  --bg-panel: #ffffff;
  --bg-panel-2: #f8faff;
  --line: rgba(60, 100, 200, 0.12);
  --line-soft: rgba(60, 100, 200, 0.07);
  /* 文本 */
  --fg: #0f1420;
  --fg-muted: #4a5578;
  --fg-dim: #8e9ab8;
  /* 品牌强调色（浅色下加深一档保对比度） */
  --accent: #2563eb;
  --accent-2: #0ea5a0;
  --accent-glow: rgba(37, 99, 235, 0.22);
  --grad: linear-gradient(120deg, #2563eb 0%, #0ea5a0 100%);
  /* 状态 */
  --ok: #0ea5a0;
  --warn: #d97706;
  --run: #2563eb;
  /* 网格底纹 */
  --grid-color: rgba(60, 100, 200, 0.06);
  /* console / card */
  --console-bg: rgba(0, 0, 0, 0.03);
  --console-border: rgba(60, 100, 200, 0.10);
  --field-icon: rgba(0, 0, 0, 0.03);
}

:root {
  --radius: 16px;
  --radius-sm: 10px;
  --shell: 1200px;
  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html, body { max-width: 100%; overflow-x: hidden; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

/* 主题切换过渡 */
html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
  transition:
    background-color .35s ease,
    background .35s ease,
    color .35s ease,
    border-color .35s ease,
    box-shadow .35s ease !important;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ============ 全局科技底纹 ============ */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 40%, transparent 100%);
}
#field-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.7;
}

main, .site-header, .site-footer { position: relative; z-index: 2; }

.shell { width: min(var(--shell), calc(100% - 48px)); margin: 0 auto; }

/* ============ 通用元素 ============ */
.section-kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent-2);
  margin-bottom: 16px;
  min-height: 1.4em;
  white-space: nowrap;
}
.kicker-cursor {
  display: inline-block;
  width: 0.7em;
  height: 1.5px;
  background: var(--accent-2);
  border-radius: 0;
  vertical-align: -3px;
  margin-left: 1px;
}
.kicker-cursor.blink {
  animation: kBlink 0.45s step-end 4;
}
.kicker-cursor.typing {
  animation: kBlink 0.6s step-end infinite;
}
.kicker-cursor.done {
  animation: kBlink 0.6s step-end infinite;
}
@keyframes kBlink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}
h1, h2, h3 { font-weight: 700; letter-spacing: -0.01em; line-height: 1.2; }
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-lead {
  color: var(--fg-muted);
  max-width: 720px;
  font-size: 17px;
  margin-top: 16px;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .25s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-primary {
  background: var(--grad);
  color: #05070d;
  box-shadow: 0 8px 30px -8px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -8px var(--accent-glow); }
.btn-line {
  background: rgba(255,255,255,0.03);
  border-color: var(--line);
  color: var(--fg);
}
.btn-line:hover { border-color: var(--accent); background: rgba(77,141,255,0.08); }
.btn-ghost { color: var(--fg-muted); padding: 8px 14px; }
.btn-ghost:hover { color: var(--fg); }

/* ============ 顶部导航 ============ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
  border-bottom: 1px solid transparent;
}
.site-header[data-elevated="true"] {
  background: rgba(5,7,13,0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.header-inner {
  width: min(var(--shell), calc(100% - 48px));
  margin: 0 auto;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--fg); }
.brand-mark {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, rgba(77,141,255,.25), rgba(53,227,196,.18));
  border: 1px solid var(--line);
  display: grid; place-items: center;
  position: relative;
}
.brand-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 12px var(--accent-glow);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 17px; letter-spacing: -0.01em; }
.brand-text em { font-style: normal; font-size: 11px; color: var(--fg-dim); font-family: var(--mono); }
.nav-links { display: flex; gap: 26px; margin-left: 12px; }
.nav-links a { color: var(--fg-muted); text-decoration: none; font-size: 15px; transition: color .2s; }
.nav-links a:hover { color: var(--fg); }
.header-actions { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; margin-left: auto; }
.nav-toggle span { width: 22px; height: 2px; background: var(--fg); border-radius: 2px; transition: .25s; }
.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  display: grid; place-items: center;
  font-size: 16px;
  transition: border-color .2s, background .2s, transform .2s;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--accent); background: rgba(77,141,255,0.10); transform: rotate(20deg); }
[data-theme="light"] .theme-toggle { background: rgba(0,0,0,0.04); }
[data-theme="light"] .theme-toggle:hover { background: rgba(37,99,235,0.08); }

/* ============ 首屏 Hero ============ */
.hero {
  padding: 136px 0 72px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -20%; left: 50%;
  width: 900px; height: 700px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(77,141,255,0.16), transparent 62%);
  pointer-events: none;
}
.hero-inner {
  width: min(var(--shell), calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  position: relative;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-muted);
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
  padding: 7px 15px;
  border-radius: 999px;
  margin-bottom: 26px;
}
.pulse-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 0 rgba(53,227,196,.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(53,227,196,.5); }
  70% { box-shadow: 0 0 0 8px rgba(53,227,196,0); }
  100% { box-shadow: 0 0 0 0 rgba(53,227,196,0); }
}
.hero h1 { font-size: clamp(30px, 4vw, 50px); line-height: 1.15; }
.hero-sub {
  color: var(--fg-muted);
  font-size: 17px;
  margin-top: 24px;
  max-width: 560px;
}
.hero-cta { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-metrics {
  display: flex;
  gap: 34px;
  list-style: none;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft);
}
.hero-metrics li { display: flex; flex-direction: column; }
.hero-metrics strong {
  font-size: 30px;
  font-family: var(--mono);
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-metrics span { font-size: 13px; color: var(--fg-dim); margin-top: 4px; }

/* Runtime 控制台 */
.hero-right { position: relative; }
.runtime-console {
  background: linear-gradient(180deg, var(--bg-panel), var(--bg-panel-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.8), 0 0 0 1px rgba(77,141,255,0.05);
}
.console-top {
  display: flex; align-items: center; gap: 10px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
}
.console-dots { display: flex; gap: 6px; }
.console-dots i { width: 10px; height: 10px; border-radius: 50%; background: #2a3350; }
.console-dots i:first-child { background: #ff5f57; }
.console-dots i:nth-child(2) { background: #febc2e; }
.console-dots i:nth-child(3) { background: #28c840; }
.console-title { font-family: var(--mono); font-size: 12px; color: var(--fg-muted); }
.console-status {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; color: var(--accent-2);
}
.status-led {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2);
  animation: blink 1.4s infinite;
}
@keyframes blink { 50% { opacity: .35; } }
.console-body { padding: 18px 18px 20px; }
.console-line { display: flex; gap: 12px; font-family: var(--mono); font-size: 12.5px; margin-bottom: 10px; }
.c-key { color: var(--fg-dim); min-width: 74px; }
.c-val { color: var(--fg); }
.console-log {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--console-bg);
  border: 1px solid var(--console-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin: 14px 0;
  min-height: 128px;
  color: var(--fg-muted);
  overflow-wrap: anywhere;
  word-break: break-word;
}
.console-line { flex-wrap: wrap; overflow-wrap: anywhere; }
.c-val { overflow-wrap: anywhere; }
.console-log .log-line { opacity: 0; transform: translateY(4px); animation: logIn .3s forwards; margin-bottom: 5px; }
.console-log .log-line .l-time { color: var(--accent); }
.console-log .log-line .l-ok { color: var(--ok); }
@keyframes logIn { to { opacity: 1; transform: none; } }
.console-progress { margin: 6px 0 14px; }
.progress-head { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: var(--fg-dim); margin-bottom: 6px; }
.progress-track { height: 5px; background: rgba(255,255,255,0.06); border-radius: 99px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: var(--grad); border-radius: 99px; transition: width .4s ease; box-shadow: 0 0 10px var(--accent-glow); }
.console-checkpoint {
  display: flex; align-items: center; gap: 9px;
  font-size: 12.5px; color: var(--fg-muted);
  padding: 10px 12px;
  border: 1px dashed rgba(245,181,68,0.3);
  border-radius: var(--radius-sm);
  background: rgba(245,181,68,0.05);
}
.ck-icon { color: var(--warn); }
.ck-tag { margin-left: auto; font-family: var(--mono); font-size: 11px; color: var(--warn); }
.hero-badge {
  position: absolute;
  bottom: -14px; right: 18px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 12.5px;
  color: var(--accent-2);
  font-family: var(--mono);
  box-shadow: 0 12px 30px -10px rgba(0,0,0,0.6);
}

.scroll-hint {
  position: absolute;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  width: 24px; height: 38px;
  border: 2px solid var(--line);
  border-radius: 14px;
  display: grid; place-items: start center;
  padding-top: 7px;
}
.scroll-hint span { width: 4px; height: 8px; border-radius: 2px; background: var(--accent); animation: scrollDot 1.6s infinite; }
@keyframes scrollDot { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 80% { opacity: 0; transform: translateY(10px); } }

/* ============ 意图带 ============ */
.intent { padding: 64px 0; }
.intent h2 { font-size: clamp(24px, 3vw, 36px); margin-bottom: 30px; }
.intent-compare { display: flex; align-items: stretch; gap: 24px; }
.cmp-card {
  flex: 1;
  border-radius: var(--radius);
  padding: 30px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
}
.cmp-old { opacity: 0.72; }
.cmp-new { border-color: rgba(77,141,255,0.35); background: linear-gradient(180deg, rgba(77,141,255,0.06), var(--bg-panel)); box-shadow: 0 20px 50px -24px var(--accent-glow); }
.cmp-tag { font-family: var(--mono); font-size: 12px; color: var(--fg-dim); }
.cmp-new .cmp-tag { color: var(--accent-2); }
.cmp-card h3 { font-size: 22px; margin: 14px 0 12px; }
.cmp-card p { color: var(--fg-muted); font-size: 15px; }
.cmp-arrow { align-self: center; font-size: 26px; color: var(--accent); }

/* ============ 滚动叙事（自动轮换） ============ */
.story {
  padding: 64px 0;
  position: relative;
}
.story-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  width: min(var(--shell), calc(100% - 48px));
  margin: 0 auto;
}
.story-text {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.story-text h2 { font-size: clamp(22px, 2.6vw, 34px); margin-bottom: 20px; flex-shrink: 0; }
.story-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.story-steps li {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  opacity: 0.4;
  flex-shrink: 0;
  transition: opacity .4s ease, background .4s ease, border-color .4s ease, transform .4s ease;
}
.story-steps li.active {
  opacity: 1;
  background: var(--bg-panel);
  border-color: var(--line);
  transform: translateX(6px);
}
.step-idx { font-family: var(--mono); font-size: 14px; color: var(--accent); min-width: 26px; }
.story-steps li.active .step-idx { color: var(--accent-2); }
.story-steps strong { display: block; font-size: 15px; margin-bottom: 2px; }
.story-steps em { font-style: normal; color: var(--fg-muted); font-size: 12.5px; }

.story-stage {
  position: relative;
  justify-self: end;
  aspect-ratio: 1 / 1;
  width: min(46vw, 520px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: radial-gradient(circle at 50% 40%, rgba(77,141,255,0.08), transparent 65%), var(--bg-panel);
  overflow: hidden;
}
#story-canvas { width: 100%; height: 100%; display: block; }
.stage-label {
  position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: 14px;
  color: var(--fg);
  background: rgba(5,7,13,0.7);
  border: 1px solid var(--line);
  padding: 7px 18px; border-radius: 999px;
  backdrop-filter: blur(6px);
  max-width: calc(100% - 40px);
  white-space: nowrap;
  text-align: center;
}

/* ============ AI 可信执行台 ============ */
.runtime { padding: 64px 0; }
.runtime h2 { font-size: clamp(26px, 3.2vw, 40px); }
.runtime-tabs { display: flex; gap: 10px; margin: 24px 0 20px; flex-wrap: wrap; }
.rt-tab {
  font-family: var(--sans);
  font-size: 15px; font-weight: 600;
  padding: 10px 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
  color: var(--fg-muted);
  cursor: pointer;
  transition: .2s;
}
.rt-tab:hover { color: var(--fg); border-color: var(--accent); }
.rt-tab.active { background: var(--grad); color: #05070d; border-color: transparent; box-shadow: 0 8px 24px -8px var(--accent-glow); }

.runtime-panel {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 18px;
  align-items: stretch;
}
.rt-evidence, .rt-exec, .rt-fields {
  background: linear-gradient(180deg, var(--bg-panel), var(--bg-panel-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
}
.rt-block-title {
  font-family: var(--mono); font-size: 12px; color: var(--fg-dim);
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 14px; margin-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}
.rt-scene-name { color: var(--accent-2); }

/* 证据链 */
.evidence-flow { display: flex; flex-direction: column; gap: 0; flex: 1; justify-content: center; }
.ev-node {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: rgba(255,255,255,0.02);
  transition: .4s;
}
.ev-node.lit {
  border-color: var(--accent);
  background: rgba(77,141,255,0.1);
  box-shadow: 0 0 20px -6px var(--accent-glow);
}
.ev-icon {
  width: 30px; height: 30px; border-radius: 8px;
  display: grid; place-items: center;
  background: var(--field-icon);
  color: var(--fg-dim); font-size: 14px;
  transition: .4s;
}
.ev-node.lit .ev-icon { color: var(--accent-2); background: rgba(53,227,196,0.12); }
.ev-name { font-size: 14px; color: var(--fg-muted); }
.ev-node.lit .ev-name { color: var(--fg); }
.ev-link { width: 2px; height: 20px; margin-left: 29px; background: var(--line-soft); transition: .4s; }
.ev-link.lit { background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }

/* 执行日志 */
.exec-log {
  font-family: var(--mono); font-size: 12.5px;
  background: var(--console-bg);
  border: 1px solid var(--console-border);
  border-radius: var(--radius-sm);
  padding: 14px;
  flex: 1;
  min-height: 210px;
  color: var(--fg-muted);
  overflow: hidden;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.exec-log .log-line { opacity: 0; transform: translateY(4px); animation: logIn .3s forwards; margin-bottom: 7px; display: flex; gap: 8px; }
.exec-log .l-time { color: var(--accent); flex-shrink: 0; }
.exec-log .l-ok { color: var(--ok); }
.exec-foot { margin-top: 16px; }
.exec-checkpoint {
  display: flex; align-items: center; gap: 9px;
  font-size: 12.5px; color: var(--fg-muted);
  padding: 10px 12px; margin-bottom: 12px;
  border: 1px dashed rgba(245,181,68,0.3);
  border-radius: var(--radius-sm);
  background: rgba(245,181,68,0.05);
}
.exec-progress .progress-track { height: 6px; }

/* 字段抽取 */
.field-list { list-style: none; flex: 1; display: flex; flex-direction: column; gap: 9px; }
.field-list li {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13.5px;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: rgba(255,255,255,0.02);
  opacity: 0; transform: translateX(8px);
  animation: fieldIn .35s forwards;
}
@keyframes fieldIn { to { opacity: 1; transform: none; } }
.field-list .f-name { color: var(--fg-muted); font-family: var(--mono); font-size: 12.5px; }
.field-list .f-val { color: var(--fg); font-weight: 600; }
.field-list .f-check { color: var(--ok); }
.rt-output {
  margin-top: 16px;
  display: flex; flex-direction: column; gap: 6px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(120deg, rgba(53,227,196,0.1), rgba(77,141,255,0.06));
  border: 1px solid rgba(53,227,196,0.25);
}
.out-label { font-family: var(--mono); font-size: 11px; color: var(--accent-2); }
.out-value { font-size: 15px; font-weight: 600; }

/* ============ 平台能力 ============ */
.platform { padding: 64px 0; }
.platform h2 { font-size: clamp(26px, 3.2vw, 40px); margin-bottom: 28px; }
.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.pf-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
  background: var(--bg-panel);
  position: relative;
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.pf-card::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--grad); opacity: 0; transition: .3s;
}
.pf-card:hover { transform: translateY(-6px); border-color: rgba(77,141,255,0.4); box-shadow: 0 24px 50px -26px var(--accent-glow); }
.pf-card:hover::before { opacity: 1; }
.pf-idx { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.pf-card h3 { font-size: 19px; margin: 12px 0 10px; }
.pf-card p { color: var(--fg-muted); font-size: 14.5px; min-height: 84px; }
.pf-tag {
  display: inline-block; margin-top: 10px;
  font-family: var(--mono); font-size: 11px; color: var(--accent-2);
  border: 1px solid rgba(53,227,196,0.3);
  border-radius: 999px; padding: 4px 12px;
}

/* ============ 业务场景 ============ */
.scenarios { padding: 64px 0; }
.scenarios h2 { font-size: clamp(26px, 3.2vw, 40px); margin-bottom: 28px; }
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.scene-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: linear-gradient(135deg, var(--bg-panel), var(--bg-panel-2));
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.scene-card:hover { transform: translateY(-5px); border-color: rgba(77,141,255,0.4); box-shadow: 0 22px 48px -26px var(--accent-glow); }
.scene-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.scene-badge { font-family: var(--mono); font-size: 11px; color: var(--accent-2); border: 1px solid rgba(53,227,196,0.3); border-radius: 999px; padding: 4px 12px; }
.scene-num { font-family: var(--mono); font-size: 26px; color: rgba(255,255,255,0.1); font-weight: 700; }
.scene-card h3 { font-size: 21px; margin-bottom: 10px; }
.scene-card p { color: var(--fg-muted); font-size: 14.5px; }

/* ============ 可信机制 ============ */
.trust { padding: 64px 0; }
.trust-shell { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.trust-text h2 { font-size: clamp(24px, 3vw, 36px); }
.trust-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.trust-list li {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-panel);
}
.t-icon {
  width: 38px; height: 38px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center;
  background: rgba(77,141,255,0.1);
  color: var(--accent-2); font-size: 16px;
}
.trust-list strong { display: block; font-size: 16px; margin-bottom: 4px; }
.trust-list em { font-style: normal; color: var(--fg-muted); font-size: 13.5px; }

/* ============ 实验室 ============ */
.lab { padding: 34px 0 64px; }
.lab-shell {
  display: flex; align-items: center; gap: 32px;
  padding: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 12% 30%, rgba(77,141,255,0.14), transparent 45%),
    radial-gradient(circle at 88% 70%, rgba(53,227,196,0.1), transparent 45%),
    var(--bg-panel);
  flex-wrap: wrap;
}
.lab-badge {
  width: 84px; height: 84px; border-radius: 20px; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--grad); color: #05070d;
  font-family: var(--mono); font-weight: 700; font-size: 22px;
  box-shadow: 0 14px 34px -12px var(--accent-glow);
}
.lab-text { flex: 1; min-width: 280px; }
.lab-text h2 { font-size: 26px; margin-bottom: 10px; }
.lab-text p { color: var(--fg-muted); font-size: 15px; max-width: 640px; }
.lab-tags { display: flex; gap: 10px; flex-wrap: wrap; }
.lab-tags span { font-family: var(--mono); font-size: 12px; color: var(--fg-muted); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; }

/* ============ 联系 ============ */
.contact { padding: 26px 0 64px; }
.contact-shell {
  display: grid; grid-template-columns: 1.4fr 0.8fr; gap: 48px; align-items: center;
  padding: 48px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 80% 20%, rgba(77,141,255,0.12), transparent 50%),
    linear-gradient(180deg, var(--bg-panel), var(--bg-2));
}
.contact-text h2 { font-size: clamp(24px, 3vw, 34px); }
.contact-cta { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.contact-note { margin-top: 18px; color: var(--fg-dim); font-size: 13px; }
.contact-qr { display: grid; place-items: center; }
.qr-box { text-align: center; }
.qr-placeholder {
  width: 158px; height: 158px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px; padding: 22px;
  margin: 0 auto 14px;
}
.qr-placeholder span { background: rgba(255,255,255,0.08); border-radius: 4px; }
.qr-placeholder span:nth-child(1), .qr-placeholder span:nth-child(3),
.qr-placeholder span:nth-child(5), .qr-placeholder span:nth-child(9) { background: rgba(77,141,255,0.35); }
.qr-box p { color: var(--fg-muted); font-size: 13.5px; }
.qr-box em { font-style: normal; color: var(--fg-dim); font-size: 12px; }

/* ============ 页脚 ============ */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0 26px; background: var(--bg-2); }
.footer-shell { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer-brand strong { font-size: 17px; }
.footer-brand p { color: var(--fg-dim); font-size: 14px; margin-top: 8px; }
.footer-cols { display: flex; gap: 48px; flex-wrap: wrap; }
.footer-cols div { display: flex; flex-direction: column; gap: 10px; }
.footer-cols span { font-size: 13px; color: var(--fg-dim); font-family: var(--mono); margin-bottom: 4px; }
.footer-cols a { color: var(--fg-muted); text-decoration: none; font-size: 14px; transition: color .2s; }
.footer-cols a:hover { color: var(--fg); }
.footer-bottom {
  margin-top: 40px; padding-top: 24px;
  border-top: 1px solid var(--line-soft);
  display: grid; justify-items: center; gap: 10px;
  text-align: center;
  color: var(--fg-dim); font-size: 13px;
}
.icp-link { color: var(--fg-dim); text-decoration: none; transition: color .2s; }
.icp-link:hover, .icp-link:focus-visible { color: var(--accent); text-decoration: underline; }

/* ============ 悬浮客服 ============ */
.float-chat {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 58px; height: 58px; border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--grad);
  cursor: pointer;
  display: grid; place-items: center;
  box-shadow: 0 14px 34px -10px var(--accent-glow);
  transition: transform .2s;
}
.float-chat:hover { transform: scale(1.08); }
.fc-icon { font-size: 24px; }
.fc-badge { position: absolute; top: 10px; right: 12px; width: 10px; height: 10px; border-radius: 50%; background: var(--warn); border: 2px solid var(--bg); }

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .story-shell, .trust-shell, .contact-shell { grid-template-columns: 1fr; gap: 32px; }
  .runtime-panel { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  /* 移动端：fixed 面板改回普通流布局 */
  .story { padding: 40px 0; }
  .story-inner { grid-template-columns: 1fr; gap: 32px; }
  .story-stage { width: 100%; aspect-ratio: 16/10; }
  .contact-shell { padding: 28px; }
}
@media (max-width: 720px) {
  .nav-links, .header-actions { display: none; }
  .nav-toggle { display: flex; }
  .site-header[data-menu="open"] .nav-links {
    display: flex; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(5,7,13,0.96); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line); padding: 12px 24px 20px;
  }
  .site-header[data-menu="open"] .nav-links a { padding: 12px 0; border-bottom: 1px solid var(--line-soft); }
  .hero { padding: 100px 0 50px; }
  .intent-compare { flex-direction: column; }
  .cmp-arrow { transform: rotate(90deg); }
  .platform-grid, .scene-grid, .trust-list { grid-template-columns: 1fr; }
  .hero-metrics { gap: 22px; flex-wrap: wrap; }
  .lab-shell, .contact-shell { padding: 24px; }
  .footer-shell { flex-direction: column; gap: 28px; }
}

/* ============ 浅色主题专项覆盖 ============ */
[data-theme="light"] .runtime-console,
[data-theme="light"] .rt-evidence,
[data-theme="light"] .rt-exec,
[data-theme="light"] .rt-fields {
  box-shadow: 0 2px 16px -4px rgba(37,99,235,0.10);
}
[data-theme="light"] .console-top {
  background: rgba(0,0,0,0.025);
}
[data-theme="light"] .console-dots i { background: #d1d9ee; }
[data-theme="light"] .console-dots i:first-child { background: #fc5753; }
[data-theme="light"] .console-dots i:nth-child(2) { background: #fdbc40; }
[data-theme="light"] .console-dots i:nth-child(3) { background: #33c748; }
[data-theme="light"] .hero::before {
  background: radial-gradient(circle, rgba(37,99,235,0.10), transparent 62%);
}
[data-theme="light"] .pf-card:hover,
[data-theme="light"] .scene-card:hover {
  box-shadow: 0 18px 40px -20px rgba(37,99,235,0.18);
}
[data-theme="light"] .scene-num {
  color: rgba(37, 99, 235, 0.34);
}
[data-theme="light"] .trust-list li { background: var(--bg-panel); }
[data-theme="light"] .t-icon { background: rgba(37,99,235,0.08); }
[data-theme="light"] .stage-label {
  color: #0f274a;
  background: rgba(255, 255, 255, 0.86);
  border-color: rgba(37, 99, 235, 0.22);
  box-shadow: 0 10px 28px -18px rgba(15, 23, 42, 0.45);
}
[data-theme="light"] .lab-shell {
  background:
    radial-gradient(circle at 12% 30%, rgba(37,99,235,0.10), transparent 45%),
    radial-gradient(circle at 88% 70%, rgba(14,165,160,0.08), transparent 45%),
    var(--bg-panel);
}
[data-theme="light"] .site-footer { background: var(--bg-2); }
[data-theme="light"] .contact-shell {
  background:
    radial-gradient(circle at 80% 20%, rgba(37,99,235,0.08), transparent 50%),
    linear-gradient(180deg, var(--bg-panel), var(--bg-2));
}
[data-theme="light"] .btn-primary { color: #fff; }
[data-theme="light"] .theme-icon-sun { display: none; }
[data-theme="light"] .theme-icon-moon { display: inline; }
[data-theme="dark"] .theme-icon-sun { display: inline; }
[data-theme="dark"] .theme-icon-moon { display: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
}
