/* ======================================================================
   AI督学帮 V3 · 产品官网
   设计系统 V5（与 mobile-flutter packages/core theme 完全对齐）
   配色 / 渐变 / 圆角 / 阴影 / 字体 / 动效 —— 逐项对应 AppTokens
   ====================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  /* 墨色（文字） */
  --ink: #0E1518;
  --ink-2: #4B5A61;
  --ink-3: #8B999F;
  --ink-4: #B6C0C4;

  /* 线 / 纸 / 卡 */
  --line: #E8E3D9;
  --line-2: #F1EDE5;
  --paper: #F6F4EF;
  --paper-2: #EFEBE2;
  --card: #FCFBF8;
  --card-2: #F8F6F1;

  /* 玉色（主色阶） */
  --jade-900: #0A3A32;
  --jade-800: #0E4E43;
  --jade-700: #12695A;
  --jade-600: #17806D;
  --jade-500: #1F9884;
  --jade-400: #45B39E;
  --jade-300: #7DCDBC;
  --jade-200: #B0E3D7;
  --jade-100: #D6F1E9;
  --jade-50:  #ECF8F4;

  /* 语义色 */
  --amber: #DE9440;  --amber-600: #C87F2E;  --amber-100: #F9E7CE;  --amber-50: #FDF5E9;
  --clay:  #CE5C3C;  --clay-100: #F6DCD2;   --clay-50: #FBEEE9;
  --plum:  #5750C4;  --plum-100: #DFDDF7;   --plum-50: #EFEEFB;
  --sky:   #3C77B0;  --sky-100: #D6E6F4;    --sky-50: #EEF4FA;

  /* 渐变 */
  --grad-jade:      linear-gradient(148deg, #1F9884 0%, #17806D 52%, #12695A 100%);
  --grad-jade-deep: linear-gradient(140deg, #17806D 0%, #12695A 58%, #0E4E43 100%);
  --grad-jade-light: linear-gradient(132deg, #E4F7F1 0%, #CBEFE4 48%, #AEE7D8 100%);
  --grad-ai:        linear-gradient(135deg, #17806D 0%, #2E8C93 52%, #4A85B4 100%);
  --grad-ai-light:  linear-gradient(132deg, #E8F8F3 0%, #D7F0EC 44%, #DEEBF6 100%);
  --grad-warm:      linear-gradient(140deg, #DE9440 0%, #D2694A 100%);
  --grad-paper:     linear-gradient(180deg, #FBF9F5 0%, #F6F4EF 100%);

  /* 阴影（玉色调投影） */
  --sh-1: 0 1px 2px rgba(12,58,50,.04), 0 4px 12px rgba(12,58,50,.05);
  --sh-2: 0 2px 6px rgba(12,58,50,.055), 0 12px 30px rgba(12,58,50,.08);
  --sh-3: 0 8px 20px rgba(12,58,50,.09), 0 28px 64px rgba(30,120,104,.11);

  /* 圆角 */
  --r-xs: 8px;  --r-sm: 12px;  --r-md: 16px;  --r-lg: 22px;
  --r-xl: 28px; --r-2xl: 34px; --r-full: 999px;

  /* 动效 */
  --d1: 140ms; --d2: 220ms; --d3: 320ms; --d4: 460ms;
  --ease-out: cubic-bezier(.22, .9, .3, 1);
  --ease-in-out: cubic-bezier(.5, .05, .2, 1);
  --spring: cubic-bezier(.34, 1.32, .44, 1);
  --spring-emerge: cubic-bezier(.16, 1.18, .3, 1);

  /* 字体 */
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei UI",
               "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-hand: "ZhiMangXing", "Kaiti SC", "KaiTi", cursive;
}

/* ---------- 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: var(--jade-200); color: var(--jade-900); }

.shell { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* 数字 / 英文衬线 + 等宽数字（记录感） */
.num {
  font-family: var(--font-serif);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* 眉标：eyebrow（10.5pt 大写加宽 jade-700） */
.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--jade-700);
  line-height: 1.4;
}

/* 区块标题 */
.section { padding: 96px 0; }
.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 14px 0 14px;
  color: var(--ink);
}
.section-title .accent { color: var(--jade-600); }
.section-desc { font-size: 17px; color: var(--ink-2); line-height: 1.75; }

/* 手写体点缀 */
.hand { font-family: var(--font-hand); font-weight: 400; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 50px;
  padding: 0 30px;
  border: none;
  border-radius: var(--r-full);
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: transform var(--d2) var(--ease-out), box-shadow var(--d2) var(--ease-out);
  white-space: nowrap;
}
.btn:active { transform: scale(.966); }
.btn-primary {
  background: var(--grad-jade);
  color: #fff;
  box-shadow: 0 6px 16px rgba(23,128,109,.30);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(23,128,109,.38); }
.btn-ghost {
  background: transparent;
  color: var(--jade-700);
  border: 1.5px solid var(--jade-200);
}
.btn-ghost:hover { border-color: var(--jade-400); background: var(--jade-50); transform: translateY(-2px); }
.btn-light {
  background: var(--card);
  color: var(--jade-800);
  box-shadow: var(--sh-2);
}
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--sh-3); }
.btn-sm { height: 42px; padding: 0 22px; font-size: 14px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246,244,239,.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--d2) var(--ease-out), background var(--d2) var(--ease-out);
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(252,251,248,.92); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.nav-logo img { width: 38px; height: 38px; }
.nav-logo .sub {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: .14em;
  display: block;
  line-height: 1;
  margin-top: 3px;
}
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  position: relative;
  transition: color var(--d1) var(--ease-out);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: -6px;
  height: 2px;
  border-radius: 2px;
  background: var(--jade-500);
  transition: right var(--d2) var(--ease-out);
}
.nav-links a:hover { color: var(--jade-700); }
.nav-links a:hover::after { right: 0; }
.nav-links a.active { color: var(--jade-700); font-weight: 600; }
.nav-links a.active::after { right: 0; }
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--card);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  width: 18px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform var(--d2) var(--ease-out), opacity var(--d2);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 84px 0 110px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(560px 420px at 12% -8%, rgba(175,231,216,.55), transparent 68%),
    radial-gradient(640px 480px at 92% 4%, rgba(222,221,247,.5), transparent 70%),
    radial-gradient(520px 420px at 60% 108%, rgba(214,241,233,.65), transparent 72%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px 8px 10px;
  background: rgba(252,251,248,.85);
  border: 1px solid var(--jade-200);
  border-radius: var(--r-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--jade-800);
  box-shadow: var(--sh-1);
  margin-bottom: 26px;
}
.hero-badge .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--jade-500);
  box-shadow: 0 0 0 4px rgba(31,152,132,.18);
  animation: pulse 2.4s var(--ease-in-out) infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(31,152,132,.18); }
  50%      { box-shadow: 0 0 0 7px rgba(31,152,132,.07); }
}
.hero-title {
  font-size: clamp(38px, 5.4vw, 62px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.18;
  color: var(--ink);
}
.hero-title .grad {
  background: var(--grad-ai);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  margin-top: 22px;
  font-size: 18px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 540px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 38px; }
.hero-note {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13.5px;
  color: var(--ink-3);
}
.hero-note span { display: inline-flex; align-items: center; gap: 7px; }
.hero-note svg { flex: none; }

/* Hero 右侧：App 工作台模拟（还原 App 首页签名卡 + 数据条 + 九宫格） */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}
.phone {
  width: 380px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 44px;
  box-shadow: var(--sh-3), 0 0 0 10px rgba(14,21,24,.035);
  padding: 14px;
  position: relative;
  transform: rotate(1.2deg);
  transition: transform var(--d4) var(--spring-emerge);
}
.hero-visual:hover .phone { transform: rotate(0deg) translateY(-6px); }
.phone-screen {
  background: var(--grad-paper);
  border-radius: 32px;
  padding: 22px 18px 20px;
  overflow: hidden;
  position: relative;
}
.phone-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--ink-3);
  padding: 0 6px 12px;
  font-family: var(--font-serif);
}
.app-navbar .app-eyebrow {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--jade-700);
  margin-bottom: 5px;
}
.app-navbar .app-greeting {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.16;
}
.app-navbar .app-date {
  font-size: 11.5px;
  color: var(--ink-3);
  margin-top: 4px;
}
/* 签名 Hero 卡（.hero → jadeLight 渐变 + bokeh 光斑 + sheen） */
.app-hero-card {
  margin-top: 14px;
  position: relative;
  border-radius: var(--r-xl);
  background: var(--grad-jade-light);
  border: 1px solid rgba(176,227,215,.58);
  box-shadow: 0 12px 30px rgba(12,58,50,.11);
  padding: 16px;
  overflow: hidden;
}
.app-hero-card .bokeh-1, .app-hero-card .bokeh-2 {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(252,251,248,.72) 0%, transparent 70%);
}
.app-hero-card .bokeh-1 { width: 180px; height: 180px; right: -50px; top: -80px; }
.app-hero-card .bokeh-2 { width: 140px; height: 140px; left: -46px; bottom: -66px; opacity: .5; }
.app-hero-card .sheen {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 30%, rgba(255,255,255,.24) 46%, transparent 60%);
  pointer-events: none;
}
.app-hero-card .tag {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--jade-700);
}
.app-hero-card .row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-top: 6px;
}
.app-hero-card .htitle {
  font-size: 17.5px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--jade-900);
  line-height: 1.3;
}
.app-hero-card .meta {
  font-size: 11px;
  color: var(--ink-2);
  margin-top: 5px;
}
.app-hero-card .count {
  text-align: right;
  flex: none;
}
.app-hero-card .count .v {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--jade-900);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.app-hero-card .count .u {
  font-size: 8.5px;
  color: rgba(10,58,50,.66);
  margin-top: 2px;
}
.app-hero-card .actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  position: relative;
}
.app-hero-card .go {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 34px;
  padding: 0 16px;
  border-radius: var(--r-full);
  background: var(--grad-jade-deep);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  box-shadow: 0 6px 16px rgba(14,78,67,.24);
}
.app-hero-card .hint {
  font-size: 9.5px;
  color: rgba(14,78,67,.72);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
/* 数据条 metrics ×4 */
.app-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
  margin-top: 12px;
}
.app-metric {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-1);
  padding: 10px 10px 9px;
}
.app-metric .v {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.app-metric .v.good { color: var(--jade-600); }
.app-metric .v.warn { color: var(--clay); }
.app-metric .l {
  font-size: 9px;
  color: var(--ink-3);
  letter-spacing: .05em;
  margin-top: 4px;
  white-space: nowrap;
}
/* 快捷九宫格 quickgrid */
.app-quick {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  margin-top: 12px;
}
.app-tile {
  background: var(--card);
  border: 1px solid rgba(241,237,229,.72);
  border-radius: var(--r-md);
  box-shadow: var(--sh-1);
  padding: 10px 6px 8px;
  text-align: center;
  transition: transform var(--d2) var(--ease-out), box-shadow var(--d2) var(--ease-out);
}
.app-tile:hover { transform: translateY(-3px); box-shadow: var(--sh-2); }
.app-tile img {
  width: 40px; height: 40px;
  margin: 0 auto 6px;
  border-radius: 12px;
}
.app-tile .t {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--ink);
}

/* 浮动小卡片（AI 提醒） */
.float-card {
  position: absolute;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-2);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: floaty 5.2s ease-in-out infinite;
}
.float-card img { width: 34px; height: 34px; border-radius: 10px; }
.float-card .fc-t { font-size: 12px; font-weight: 600; color: var(--ink); line-height: 1.3; }
.float-card .fc-s { font-size: 10.5px; color: var(--ink-3); line-height: 1.3; }
.float-card.fc-1 { right: -18px; top: 16%; }
.float-card.fc-2 { left: -26px; bottom: 14%; animation-delay: -2.6s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

/* ---------- 信任条 / 数字 ---------- */
.stats-band { padding: 8px 0 0; }
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-2xl);
  box-shadow: var(--sh-2);
  overflow: hidden;
}
.stat {
  padding: 34px 20px 30px;
  text-align: center;
  position: relative;
}
.stat + .stat::before {
  content: "";
  position: absolute;
  left: 0; top: 26%;
  height: 48%;
  width: 1px;
  background: var(--line-2);
}
.stat .v {
  font-family: var(--font-serif);
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--jade-700);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.stat .v .unit { font-size: .48em; font-weight: 500; color: var(--jade-600); margin-left: 2px; }
.stat .l { margin-top: 10px; font-size: 13.5px; color: var(--ink-3); letter-spacing: .06em; }

/* ---------- 角色卡片 ---------- */
.role-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.role-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-1);
  padding: 28px 24px;
  transition: transform var(--d2) var(--ease-out), box-shadow var(--d2) var(--ease-out), border-color var(--d2);
}
.role-card:hover { transform: translateY(-6px); box-shadow: var(--sh-2); border-color: var(--jade-200); }
.role-card .icon {
  width: 54px; height: 54px;
  border-radius: 15px;
  overflow: hidden;
  margin-bottom: 18px;
  box-shadow: var(--sh-1);
}
.role-card h3 { font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.role-card p { margin-top: 8px; font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }

/* ---------- 能力域（大卡） ---------- */
.domain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.domain-card {
  position: relative;
  border-radius: var(--r-2xl);
  padding: 34px 32px 30px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--sh-1);
  transition: transform var(--d3) var(--ease-out), box-shadow var(--d3) var(--ease-out);
}
.domain-card:hover { transform: translateY(-6px); box-shadow: var(--sh-3); }
.domain-card .dc-head { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.domain-card .dc-icon {
  width: 58px; height: 58px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--sh-1);
  flex: none;
}
.domain-card .dc-eyebrow {
  font-size: 10.5px; font-weight: 600; letter-spacing: .18em;
  text-transform: uppercase; color: var(--ink-3);
}
.domain-card h3 {
  font-size: 21px; font-weight: 700; letter-spacing: -0.02em; margin-top: 2px;
}
.domain-card > p { font-size: 14.5px; color: var(--ink-2); line-height: 1.75; }
.domain-card ul {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px 14px;
  list-style: none;
}
.domain-card li {
  display: flex; align-items: center; gap: 8px;
  font-size: 13.5px; color: var(--ink-2);
}
.domain-card li::before {
  content: "";
  flex: none;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--jade-400);
}
.domain-card.tint-jade { background: linear-gradient(160deg, var(--jade-50) 0%, var(--card) 46%); }
.domain-card.tint-plum { background: linear-gradient(160deg, var(--plum-50) 0%, var(--card) 46%); }
.domain-card.tint-warm { background: linear-gradient(160deg, var(--amber-50) 0%, var(--card) 46%); }
.domain-card.tint-sky  { background: linear-gradient(160deg, var(--sky-50) 0%, var(--card) 46%); }
.domain-card.tint-plum li::before { background: var(--plum); }
.domain-card.tint-warm li::before { background: var(--amber); }
.domain-card.tint-sky  li::before { background: var(--sky); }

/* ---------- AI 引擎区（深色） ---------- */
.ai-band {
  background:
    radial-gradient(720px 420px at 88% -10%, rgba(87,80,196,.28), transparent 62%),
    radial-gradient(640px 480px at 4% 110%, rgba(23,128,109,.34), transparent 64%),
    linear-gradient(160deg, #0A3A32 0%, #0E4E43 56%, #0B3D46 100%);
  color: #fff;
  border-radius: 44px;
  padding: 84px 64px;
  position: relative;
  overflow: hidden;
}
.ai-band .eyebrow { color: var(--jade-300); }
.ai-band .section-title { color: #fff; }
.ai-band .section-desc { color: rgba(255,255,255,.72); }
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 52px;
}
.ai-card {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--r-lg);
  padding: 26px 24px;
  backdrop-filter: blur(8px);
  transition: transform var(--d2) var(--ease-out), background var(--d2), border-color var(--d2);
}
.ai-card:hover {
  transform: translateY(-5px);
  background: rgba(255,255,255,.11);
  border-color: rgba(255,255,255,.26);
}
.ai-card .icon {
  width: 48px; height: 48px;
  border-radius: 13px;
  overflow: hidden;
  margin-bottom: 16px;
  box-shadow: 0 4px 14px rgba(0,0,0,.28);
}
.ai-card h3 { font-size: 17px; font-weight: 700; color: #fff; }
.ai-card p { margin-top: 8px; font-size: 13.5px; line-height: 1.7; color: rgba(255,255,255,.68); }
.ai-card .chip {
  display: inline-block;
  margin-top: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  padding: 4px 12px;
  border-radius: var(--r-full);
  background: rgba(125,205,188,.16);
  color: var(--jade-300);
  border: 1px solid rgba(125,205,188,.3);
}

/* ---------- 三端协同 ---------- */
.clients-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.client-card {
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background: var(--card);
  padding: 30px 26px;
  box-shadow: var(--sh-1);
  position: relative;
  overflow: hidden;
  transition: transform var(--d2) var(--ease-out), box-shadow var(--d2);
}
.client-card:hover { transform: translateY(-5px); box-shadow: var(--sh-2); }
.client-card .c-icon {
  width: 50px; height: 50px;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 16px;
}
.client-card h3 { font-size: 17px; font-weight: 700; }
.client-card .c-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-3);
  margin-top: 2px;
}
.client-card p { margin-top: 12px; font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }
.client-card::after {
  content: "";
  position: absolute;
  right: -46px; top: -46px;
  width: 120px; height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(174,231,216,.5), transparent 70%);
}

/* ---------- 流程 / 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
.step { position: relative; padding: 0 26px; }
.step .no {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--jade-600);
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1.5px solid var(--jade-200);
  background: var(--card);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}
.step::before {
  content: "";
  position: absolute;
  top: 21px; left: 68px; right: 0;
  height: 1.5px;
  background: repeating-linear-gradient(90deg, var(--jade-200) 0 8px, transparent 8px 16px);
}
.step:last-child::before { display: none; }
.step h3 { font-size: 17px; font-weight: 700; }
.step p { margin-top: 8px; font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }

/* ---------- 安全区 ---------- */
.sec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.sec-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px 24px;
  box-shadow: var(--sh-1);
}
.sec-card .ic {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.sec-card .ic svg { width: 21px; height: 21px; }
.sec-card h3 { font-size: 16px; font-weight: 700; }
.sec-card p { margin-top: 7px; font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }
.tone-jade { background: var(--jade-50); color: var(--jade-700); }
.tone-sky  { background: var(--sky-50); color: var(--sky); }
.tone-amber{ background: var(--amber-50); color: var(--amber-600); }
.tone-clay { background: var(--clay-50); color: var(--clay); }
.tone-plum { background: var(--plum-50); color: var(--plum); }

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  border-radius: 44px;
  background: var(--grad-jade);
  color: #fff;
  padding: 72px 64px;
  overflow: hidden;
  text-align: center;
}
.cta-band::before {
  content: "";
  position: absolute;
  width: 420px; height: 420px;
  border-radius: 50%;
  right: -120px; top: -180px;
  background: radial-gradient(circle, rgba(255,255,255,.14), transparent 68%);
}
.cta-band::after {
  content: "";
  position: absolute;
  width: 340px; height: 340px;
  border-radius: 50%;
  left: -110px; bottom: -170px;
  background: radial-gradient(circle, rgba(255,255,255,.10), transparent 66%);
}
.cta-band h2 {
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  position: relative;
}
.cta-band p {
  margin-top: 14px;
  font-size: 16px;
  color: rgba(255,255,255,.78);
  position: relative;
}
.cta-band .hand { color: var(--jade-200); font-size: 20px; }
.cta-band .cta-actions {
  margin-top: 34px;
  display: flex; justify-content: center; gap: 16px; flex-wrap: wrap;
  position: relative;
}

/* ---------- 页脚 ---------- */
.footer {
  margin-top: 110px;
  background: #0A2420;
  color: rgba(255,255,255,.66);
  padding: 68px 0 34px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer .brand { display: flex; align-items: center; gap: 12px; color: #fff; font-size: 19px; font-weight: 700; }
.footer .brand img { width: 38px; height: 38px; }
.footer .f-desc { margin-top: 16px; font-size: 13.5px; line-height: 1.8; max-width: 300px; }
.footer .f-contact { margin-top: 18px; font-size: 13px; line-height: 2; }
.footer .f-contact b { color: rgba(255,255,255,.86); font-weight: 600; }
.footer h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  margin-bottom: 18px;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 11px; }
.footer li a { font-size: 13.5px; color: rgba(255,255,255,.6); transition: color var(--d1); }
.footer li a:hover { color: var(--jade-300); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 28px;
  font-size: 12.5px;
  color: rgba(255,255,255,.4);
}

/* ---------- 备案信息 ---------- */
.footer-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* 工信部要求：备案号可点击跳转至 beian.miit.gov.cn */
.beian-link {
  color: rgba(255,255,255,.4);
  text-decoration: none;
  transition: color .18s var(--ease-out);
}

.beian-link:hover {
  color: rgba(255,255,255,.75);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 表单（联系页） ---------- */
.form-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-2xl);
  box-shadow: var(--sh-2);
  padding: 44px 42px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-2);
  margin-bottom: 8px;
}
.field label .req { color: var(--clay); }
.field input, .field select, .field textarea {
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 13px 16px;
  outline: none;
  transition: border-color var(--d1), box-shadow var(--d1);
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--jade-600);
  box-shadow: 0 0 0 3px rgba(23,128,109,.12);
}
.field input::placeholder, .field textarea::placeholder { color: var(--ink-4); }
.form-ok {
  display: none;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--r-md);
  background: var(--jade-50);
  border: 1px solid var(--jade-200);
  color: var(--jade-800);
  font-size: 14px;
  font-weight: 600;
}
.form-ok.show { display: flex; animation: rise var(--d3) var(--spring-emerge); }

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--d2);
}
.faq-item.open { box-shadow: var(--sh-1); }
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 19px 22px;
  background: none;
  border: none;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
}
.faq-q .arr {
  flex: none;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--jade-50);
  color: var(--jade-700);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  transition: transform var(--d2) var(--ease-out);
}
.faq-item.open .faq-q .arr { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--d3) var(--ease-out);
}
.faq-a p { padding: 0 22px 20px; font-size: 14px; color: var(--ink-2); line-height: 1.8; }

/* ---------- 功能表 ---------- */
.feature-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--sh-1);
}
.feature-table th, .feature-table td {
  padding: 15px 22px;
  font-size: 14px;
  text-align: left;
  border-bottom: 1px solid var(--line-2);
}
.feature-table th {
  background: var(--card-2);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.feature-table tr:last-child td { border-bottom: none; }
.feature-table td:first-child { font-weight: 600; color: var(--ink); white-space: nowrap; }
.feature-table td { color: var(--ink-2); }
.yes { color: var(--jade-600); font-weight: 700; }
.no  { color: var(--ink-4); }
.trial-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 11.5px;
  font-weight: 600;
  border-radius: var(--r-full);
  background: var(--jade-50);
  color: var(--jade-700);
}

/* ---------- 价格卡 ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.price-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-2xl);
  padding: 36px 32px;
  box-shadow: var(--sh-1);
  display: flex;
  flex-direction: column;
  transition: transform var(--d2) var(--ease-out), box-shadow var(--d2);
}
.price-card:hover { transform: translateY(-6px); box-shadow: var(--sh-2); }
.price-card.featured {
  background: linear-gradient(165deg, var(--jade-50) 0%, var(--card) 52%);
  border-color: var(--jade-200);
  box-shadow: var(--sh-2);
}
.price-card .pop {
  position: absolute;
  top: 22px; right: 22px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  padding: 5px 14px;
  border-radius: var(--r-full);
  background: var(--grad-jade);
  color: #fff;
  box-shadow: 0 4px 12px rgba(23,128,109,.3);
}
.price-card .p-name { font-size: 18px; font-weight: 700; }
.price-card .p-for { font-size: 12.5px; color: var(--ink-3); margin-top: 4px; }
.price-card .p-price { margin-top: 22px; display: flex; align-items: baseline; gap: 5px; }
.price-card .p-price .cny { font-size: 16px; font-weight: 600; color: var(--jade-700); }
.price-card .p-price .v {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.price-card .p-price .u { font-size: 13px; color: var(--ink-3); }
.price-card ul { list-style: none; margin: 24px 0 30px; flex: 1; }
.price-card li {
  display: flex;
  gap: 10px;
  font-size: 13.5px;
  color: var(--ink-2);
  margin-bottom: 11px;
  line-height: 1.55;
}
.price-card li svg { flex: none; margin-top: 3px; }
.price-card .btn { width: 100%; }

/* ---------- 入场动画（IntersectionObserver 驱动） ---------- */
.rv {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--d4) var(--ease-out), transform var(--d4) var(--spring-emerge);
  transition-delay: var(--rvd, 0ms);
  will-change: opacity, transform;
}
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .float-card { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 64px; }
  .hero-visual { order: -1; }
  .role-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
  .clients-band { grid-template-columns: repeat(2, 1fr); }
  .sec-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 36px; }
  .step::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-band { padding: 64px 44px; }
  .contact-grid { grid-template-columns: 1fr !important; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
}
@media (max-width: 760px) {
  .section { padding: 68px 0; }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--card);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--sh-2);
    padding: 10px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 28px; }
  .nav-links a::after { display: none; }
  .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
  .hero { padding: 48px 0 84px; }
  .phone { width: 330px; }
  .float-card.fc-1 { right: -6px; }
  .float-card.fc-2 { left: -6px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3)::before { display: none; }
  .role-grid, .domain-grid, .ai-grid, .clients-band, .sec-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .ai-band { border-radius: 30px; padding: 52px 26px; }
  .cta-band { border-radius: 30px; padding: 52px 26px; }
  .form-card { padding: 32px 24px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .feature-table { display: block; overflow-x: auto; }
}