/* ============================================================
   一莲AI 官网全局样式 v2.1  多主题版
   品牌色（定稿锁定，禁止改动）：
     主色(科技青蓝) #0F6878 | 辅助浅底 #E8F4F6
     正文深色 #1A2426       | 辅助浅文字 #546467
   设计方向：更高级 · 更简约 · 更克制
   主题机制：<html data-theme="teal|indigo"> 切换，CSS 变量驱动
     teal   = 青绿主题（默认，现有品牌色体系，保持不变）
     indigo = 靛蓝主题（旧版保留，稳重企业感）
   ============================================================ */

:root {
  --brand: #0F6878;
  --brand-light: #1B9BA8;
  --brand-bg: #E8F4F6;
  --brand-rgb: 15, 104, 120;
  --brand-light-rgb: 27, 155, 168;
  --brand-bg-rgb: 232, 244, 246;
  --ink: #1A2426;
  --ink-light: #546467;
  --ink-faint: #8A9B9E;
  --white: #FFFFFF;
  --border: #DCE8EA;
  --border-soft: #E8F0F1;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 16px rgba(var(--brand-rgb), 0.06);
  --shadow-md: 0 8px 28px rgba(var(--brand-rgb), 0.10);
  --shadow-lg: 0 16px 48px rgba(var(--brand-rgb), 0.16);
  --grad: linear-gradient(135deg, #0F6878 0%, #1B9BA8 100%);
  --hero-deep-1: #0B5562;
  --hero-deep-2: #093F49;
  --hero-bg: linear-gradient(160deg, #0F6878 0%, var(--hero-deep-1) 55%, var(--hero-deep-2) 100%);
  --auth-deep: #D6EBEE;
  --hero-glow: radial-gradient(120% 130% at 85% -20%, rgba(27,155,168,0.45) 0%, transparent 55%);
  --hero-accent: #86D8E0;
  --hero-accent-rgb: 134, 216, 224;
  --hero-text: #C4DEE2;
  --hero-note: #8FB6BC;
  --auth-bg: linear-gradient(160deg, #E8F4F6 0%, var(--auth-deep) 100%);
  --ease: cubic-bezier(.22,.61,.36,1);
}

[data-theme="teal"] {
  --brand: #0F6878;
  --brand-light: #1B9BA8;
  --brand-bg: #E8F4F6;
  --brand-rgb: 15, 104, 120;
  --brand-light-rgb: 27, 155, 168;
  --brand-bg-rgb: 232, 244, 246;
  --ink: #1A2426;
  --ink-light: #546467;
  --ink-faint: #8A9B9E;
  --white: #FFFFFF;
  --border: #DCE8EA;
  --border-soft: #E8F0F1;
  --shadow: 0 2px 16px rgba(var(--brand-rgb), 0.06);
  --shadow-md: 0 8px 28px rgba(var(--brand-rgb), 0.10);
  --shadow-lg: 0 16px 48px rgba(var(--brand-rgb), 0.16);
  --grad: linear-gradient(135deg, #0F6878 0%, #1B9BA8 100%);
  --hero-deep-1: #0B5562;
  --hero-deep-2: #093F49;
  --hero-bg: linear-gradient(160deg, #0F6878 0%, var(--hero-deep-1) 55%, var(--hero-deep-2) 100%);
  --auth-deep: #D6EBEE;
  --hero-glow: radial-gradient(120% 130% at 85% -20%, rgba(27,155,168,0.45) 0%, transparent 55%);
  --hero-accent: #86D8E0;
  --hero-accent-rgb: 134, 216, 224;
  --hero-text: #C4DEE2;
  --hero-note: #8FB6BC;
  --auth-bg: linear-gradient(160deg, #E8F4F6 0%, var(--auth-deep) 100%);
}

[data-theme="indigo"] {
  --brand: #4F46E5;
  --brand-light: #7C8CF8;
  --brand-bg: #EEF2FF;
  --brand-rgb: 79, 70, 229;
  --brand-light-rgb: 124, 58, 237;
  --brand-bg-rgb: 238, 242, 255;
  --ink: #1A2426;
  --ink-light: #4B5563;
  --ink-faint: #9CA3AF;
  --white: #FFFFFF;
  --border: #E5E7EB;
  --border-soft: #F3F4F6;
  --shadow: 0 2px 16px rgba(var(--brand-rgb), 0.06);
  --shadow-md: 0 8px 28px rgba(var(--brand-rgb), 0.10);
  --shadow-lg: 0 16px 48px rgba(var(--brand-rgb), 0.16);
  --grad: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  --hero-deep-1: #4338CA;
  --hero-deep-2: #312E81;
  --hero-bg: linear-gradient(160deg, #4F46E5 0%, var(--hero-deep-1) 55%, var(--hero-deep-2) 100%);
  --auth-deep: #E0E7FF;
  --hero-glow: radial-gradient(120% 130% at 85% -20%, rgba(124,58,237,0.40) 0%, transparent 55%);
  --hero-accent: #C7D2FE;
  --hero-accent-rgb: 199, 210, 254;
  --hero-text: #E0E7FF;
  --hero-note: #A5B4FC;
  --auth-bg: linear-gradient(160deg, #EEF2FF 0%, var(--auth-deep) 100%);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', -apple-system, Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
  letter-spacing: 0.01em;
  font-feature-settings: 'ss01';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(var(--brand-rgb), .16); color: var(--ink); }

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* 克制入场：首屏后区块淡入上移一次 */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.section, .footer { animation: rise .7s var(--ease) both; }

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.nav-logo { display: flex; align-items: center; gap: 8px; padding: 0; }
.nav-logo img { height: 28px; width: auto; display: block; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a {
  position: relative;
  font-size: 14.5px; color: var(--ink-light);
  padding: 6px 0;
  transition: color .2s var(--ease);
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; border-radius: 2px; background: var(--brand);
  transition: right .25s var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--brand); font-weight: 600; }
.nav-links a:hover::after, .nav-links a.active::after { right: 0; }
.nav-actions { display: flex; align-items: center; gap: 12px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 11px 24px; border-radius: 10px; font-size: 14px; font-weight: 600;
  border: none; transition: all .22s var(--ease); white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 4px 14px rgba(var(--brand-rgb), .22); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(var(--brand-rgb), .30); }
.btn-ghost { background: transparent; color: var(--brand); border: 1.5px solid var(--brand); }
.btn-ghost:hover { background: var(--brand-bg); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--ink-light); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--brand); color: var(--brand); }
.btn-lg { padding: 15px 36px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* 汉堡菜单 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: all .2s; }

/* ---------- 页脚 ---------- */
.footer { background: var(--ink); color: #A7B6B9; margin-top: 96px; }
.footer-inner { padding: 56px 24px 28px; max-width: 1160px; margin: 0 auto; }
.footer-top { display: flex; justify-content: space-between; gap: 48px; flex-wrap: wrap; }
.footer-brand p { margin-top: 14px; font-size: 13px; max-width: 340px; color: #7E9195; line-height: 1.8; }
.footer-cols { display: flex; gap: 72px; flex-wrap: wrap; }
.footer-col h4 { color: #fff; font-size: 13px; margin-bottom: 16px; letter-spacing: .04em; }
.footer-col a { display: block; font-size: 13px; color: #A7B6B9; margin-bottom: 11px; transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-partners { margin-top: 36px; padding-top: 28px; border-top: 1px solid #2A3A3D; }
.footer-partners h4 { color: #fff; font-size: 13px; margin-bottom: 16px; letter-spacing: .04em; }
.partner-list { display: flex; gap: 16px; flex-wrap: wrap; }
.partner-item {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px; padding: 10px 18px 10px 12px; color: #A7B6B9; font-size: 13px;
  transition: all .25s var(--ease);
}
.partner-item img { width: 34px; height: 34px; border-radius: 8px; object-fit: contain; background: #fff; padding: 3px; }
.partner-item .pi-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.partner-item .pi-text b { color: #E8F0F1; font-size: 13px; font-weight: 600; white-space: nowrap; }
.partner-item .pi-text em { color: #93A6A9; font-size: 10px; font-style: normal; white-space: nowrap; letter-spacing: .2px; }
.partner-item:hover .pi-text em { color: #B7C8CB; }
.partner-item:hover { color: #fff; border-color: rgba(255,255,255,0.35); background: rgba(255,255,255,0.1); }
.footer-bottom {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid #2A3A3D;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 12px; color: #6B7F83;
}

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .tag {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  background: var(--brand-bg); color: var(--brand); font-size: 12.5px; font-weight: 600;
  letter-spacing: .06em; margin-bottom: 16px;
}
.section-head h2 { font-size: 34px; font-weight: 700; color: var(--ink); margin-bottom: 14px; letter-spacing: -0.01em; }
.section-head p { color: var(--ink-light); font-size: 16px; }

/* ---------- 首屏 Banner ---------- */
.hero {
  background: var(--hero-glow), var(--hero-bg);
  color: #fff; padding: 110px 0 100px; position: relative; overflow: hidden;
}
.hero::after {
  content: ''; position: absolute; right: -160px; top: -160px; width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(var(--brand-light-rgb),0.30) 0%, transparent 65%);
}
.hero-inner { position: relative; z-index: 2; max-width: 780px; }
.hero h1 { font-size: 46px; line-height: 1.22; font-weight: 700; margin-bottom: 22px; letter-spacing: -0.015em; }
.hero h1 em { font-style: normal; color: var(--hero-accent); }
.hero p { font-size: 18px; color: var(--hero-text); margin-bottom: 36px; max-width: 640px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 26px; }
.hero .btn-primary { background: #fff; color: var(--brand); box-shadow: 0 8px 28px rgba(0,0,0,.18); }
.hero .btn-primary:hover { box-shadow: 0 12px 36px rgba(255,255,255,0.22); transform: translateY(-1px); }
.hero .btn-ghost { color: #fff; border-color: rgba(255,255,255,0.45); }
.hero .btn-ghost:hover { background: rgba(255,255,255,0.12); border-color: #fff; }
.hero-prods { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 20px; }
.hero-prod { display: inline-flex; align-items: center; gap: 8px; padding: 9px 18px; border-radius: 999px; background: rgba(255,255,255,.82); border: 1px solid var(--border-soft); box-shadow: 0 4px 14px rgba(var(--brand-rgb), .10); color: #2B3440; font-size: 14px; font-weight: 600; text-decoration: none; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.hero-prod:hover { transform: translateY(-3px); box-shadow: 0 10px 22px rgba(var(--brand-rgb), .18); border-color: var(--brand); }
.hp-ico { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 8px; background: linear-gradient(135deg, var(--brand), var(--brand-deep)); color: #fff; }
.hp-price { font-size: 12px; font-weight: 700; color: var(--brand); background: rgba(var(--brand-rgb), .10); padding: 2px 10px; border-radius: 999px; }
@media (max-width: 640px) { .hero-prods { gap: 8px; } .hero-prod { padding: 7px 13px; font-size: 13px; } .hp-price { display: none; } }
.prod3-note { display: block; margin-top: 12px; font-size: 12px; color: var(--brand); opacity: .85; }
.prod-cta { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; margin-top: 30px; padding: 22px; border-radius: 18px; background: linear-gradient(120deg, rgba(var(--brand-rgb), .06), rgba(var(--brand-rgb), .12)); border: 1px solid rgba(var(--brand-rgb), .16); }
.prod-cta-tip { font-size: 13px; color: #64748B; }
@media (max-width: 640px) { .prod-cta { flex-direction: column; text-align: center; } }

.hero-note { font-size: 13px; color: var(--hero-note); letter-spacing: .02em; }

/* ---------- 卡片 ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: var(--white); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 36px 30px; box-shadow: var(--shadow); transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: rgba(var(--brand-rgb), .18); }
.card .card-icon {
  width: 54px; height: 54px; border-radius: 14px; background: var(--brand-bg);
  display: flex; align-items: center; justify-content: center; margin-bottom: 20px;
  transition: transform .3s var(--ease);
}
.card:hover .card-icon { transform: scale(1.05); }
.card h3 { font-size: 18px; margin-bottom: 10px; letter-spacing: -0.005em; }
.card p { color: var(--ink-light); font-size: 14px; line-height: 1.75; }

/* ---------- 能力列表 ---------- */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.feature-item {
  display: flex; gap: 16px; padding: 22px; border: 1px solid var(--border-soft);
  border-radius: 14px; background: var(--white); align-items: flex-start;
  transition: border-color .25s, box-shadow .25s;
}
.feature-item:hover { border-color: rgba(var(--brand-rgb), .22); box-shadow: var(--shadow); }
.feature-item .fi-num {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 10px;
  background: var(--grad); color: #fff; display: flex; align-items: center;
  justify-content: center; font-size: 14px; font-weight: 700;
}
.feature-item h4 { font-size: 16px; margin-bottom: 4px; }
.feature-item p { font-size: 13.5px; color: var(--ink-light); line-height: 1.7; }

/* ---------- 对比表格 ---------- */
.compare-table { width: 100%; border-collapse: collapse; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.compare-table th, .compare-table td { padding: 18px 22px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--border-soft); }
.compare-table thead th { background: var(--grad); color: #fff; font-weight: 600; letter-spacing: .02em; }
.compare-table thead th:first-child { width: 180px; }
.compare-table tbody tr:nth-child(even) { background: rgba(var(--brand-bg-rgb), .45); }
.compare-table tbody tr { transition: background .2s; }
.compare-table tbody tr:hover { background: var(--brand-bg); }
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table td:first-child { font-weight: 600; color: var(--ink); }
.compare-table .yes { color: var(--brand); font-weight: 700; }
.compare-table .no { color: #B0BEC2; }

/* ---------- 定价卡片 ---------- */
.price-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; align-items: stretch; }
.price-card {
  border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 38px 32px;
  background: var(--white); box-shadow: var(--shadow); display: flex; flex-direction: column;
  position: relative; transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.price-card.featured { border: 1.5px solid var(--brand); box-shadow: var(--shadow-lg); }
.price-card.featured::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  border-radius: var(--radius) var(--radius) 0 0; background: var(--grad);
}
.price-card .pc-hot { display: inline-block; margin-left: 8px; padding: 2px 10px; border-radius: 999px; background: linear-gradient(135deg, var(--brand), var(--brand-deep)); color: #fff; font-size: 11px; font-weight: 700; vertical-align: 1px; }
.pc-trust { margin-top: 12px; font-size: 12px; color: #64748B; }

.price-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #fff; font-size: 12px; padding: 5px 16px;
  border-radius: 999px; font-weight: 600; white-space: nowrap; letter-spacing: .04em;
}
.price-card .pc-name { font-size: 18px; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.005em; }
.price-card .pc-desc { font-size: 13px; color: var(--ink-light); margin-bottom: 20px; }
.price-card .pc-price { display: flex; align-items: baseline; gap: 6px; margin-bottom: 22px; }
.price-card .pc-price .num { font-size: 42px; font-weight: 800; color: var(--brand); letter-spacing: -0.02em; }
.price-card .pc-price .unit { font-size: 14px; color: var(--ink-light); }
.price-card .pc-feats { flex: 1; margin-bottom: 26px; }
.price-card .pc-feats li {
  font-size: 13.5px; color: var(--ink-light); padding: 7px 0 7px 24px;
  position: relative; line-height: 1.7;
}
.price-card .pc-feats li::before {
  content: '✓'; position: absolute; left: 0; color: var(--brand); font-weight: 700;
}
.price-card .btn { width: 100%; }

/* ---------- 下载专区 ---------- */
.download-zone {
  background: var(--brand-bg); border-radius: var(--radius); padding: 48px;
  text-align: center; border: 1px dashed var(--brand-light);
}
.download-zone h3 { font-size: 22px; margin-bottom: 10px; }
.download-zone p { color: var(--ink-light); margin-bottom: 24px; }
.download-zone .locked { color: var(--ink-light); font-size: 14px; }
.download-zone .locked strong { color: var(--brand); }

/* ---------- 登录页 ---------- */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--auth-bg); padding: 24px; }
.auth-card {
  width: 100%; max-width: 420px; background: #fff; border-radius: 20px;
  box-shadow: var(--shadow-lg); padding: 44px 38px;
  border: 1px solid var(--border-soft);
}
.auth-card .auth-logo { display: flex; justify-content: center; margin-bottom: 20px; }
.auth-card .auth-logo img { height: 56px; }
.auth-card h1 { text-align: center; font-size: 22px; margin-bottom: 6px; }
.auth-card .auth-sub { text-align: center; color: var(--ink-light); font-size: 13px; margin-bottom: 28px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--ink-light); margin-bottom: 6px; }
.form-group input {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 14px; outline: none; transition: border-color .2s, box-shadow .2s; color: var(--ink);
}
.form-group input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(var(--brand-rgb), .10); }
.auth-msg { font-size: 13px; margin-top: 10px; text-align: center; min-height: 20px; }
.auth-msg.err { color: #D32F2F; }
.auth-msg.ok { color: var(--brand); }
.auth-foot { text-align: center; margin-top: 18px; font-size: 13px; color: var(--ink-light); }
.auth-foot a { color: var(--brand); font-weight: 600; }

/* ---------- 文档中心 ---------- */
.doc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.doc-card { border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 28px; transition: all .25s var(--ease); background: #fff; }
.doc-card:hover { border-color: var(--brand); box-shadow: var(--shadow); transform: translateY(-3px); }
.doc-card h3 { font-size: 16px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.doc-card p { font-size: 13px; color: var(--ink-light); line-height: 1.7; }
.doc-card .doc-tag {
  display: inline-block; margin-top: 14px; font-size: 12px; color: var(--brand);
  background: var(--brand-bg); padding: 4px 12px; border-radius: 999px;
}

/* ---------- 关于页 ---------- */
.value-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card { text-align: center; padding: 28px 18px; }
.value-card .vc-num { font-size: 36px; font-weight: 800; color: var(--brand); margin-bottom: 8px; letter-spacing: -0.02em; }
.value-card h4 { font-size: 15px; margin-bottom: 6px; }
.value-card p { font-size: 13px; color: var(--ink-light); line-height: 1.7; }

/* ---------- 通用工具 ---------- */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; }
.bg-light { background: var(--brand-bg); }
.flow { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; }
.flow-step {
  background: var(--white); border: 1px solid var(--border-soft); border-radius: 14px;
  padding: 20px 24px; text-align: center; min-width: 130px;
  transition: transform .25s var(--ease), box-shadow .25s;
}
.flow-step:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.flow-step .fs-title { font-weight: 700; font-size: 14px; color: var(--brand); margin-bottom: 4px; }
.flow-step .fs-sub { font-size: 12px; color: var(--ink-light); }
.flow-arrow { color: var(--brand-light); font-size: 20px; font-weight: 700; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .cards, .price-cards, .doc-grid { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .value-cards { grid-template-columns: repeat(2, 1fr); }
  .nav-links {
    display: none; position: absolute; top: 66px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 16px 24px;
    border-bottom: 1px solid var(--border); gap: 16px; align-items: flex-start;
    box-shadow: var(--shadow-md);
  }
  .nav-links a::after { display: none; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero { padding: 72px 0; }
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 16px; }
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 26px; }
  .compare-table { font-size: 12px; }
  .compare-table th, .compare-table td { padding: 12px 10px; }
  .download-zone { padding: 32px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .section, .footer { animation: none; }
  * { transition: none !important; }
}


/* ===== 三款产品立体货架（product.html） ===== */
.prod3-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1080px;margin:0 auto;padding:4px 0 44px}
.prod3-card{position:relative;display:block;text-decoration:none;border-radius:22px;
  background:linear-gradient(180deg,#fff 0%,#F5FAFB 100%);border:1px solid var(--border-soft);
  padding:30px 26px 24px;overflow:hidden;
  box-shadow:0 1px 2px rgba(var(--brand-rgb),.05),0 14px 34px -10px rgba(var(--brand-rgb),.16);
  transition:transform .28s var(--ease),box-shadow .28s var(--ease)}
.prod3-card::before{content:'';position:absolute;top:-64px;right:-64px;width:170px;height:170px;border-radius:50%;
  background:radial-gradient(circle,rgba(var(--brand-rgb),.10) 0%,transparent 70%)}
.prod3-card::after{content:'';position:absolute;left:24px;right:24px;bottom:0;height:3px;border-radius:3px 3px 0 0;
  background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.prod3-card:hover{transform:translateY(-10px);box-shadow:0 2px 4px rgba(var(--brand-rgb),.06),0 30px 56px -16px rgba(var(--brand-rgb),.26)}
.prod3-card:hover::after{transform:scaleX(1)}
.prod3-ico{width:60px;height:60px;border-radius:18px;background:var(--grad);display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 22px -6px rgba(var(--brand-rgb),.45);margin-bottom:16px;transition:transform .28s var(--ease)}
.prod3-card:hover .prod3-ico{transform:translateY(-3px) scale(1.05)}
.prod3-ico svg{width:30px;height:30px;stroke:#fff;stroke-width:16;stroke-linecap:round;stroke-linejoin:round;fill:none}
.prod3-tag{position:absolute;top:22px;right:20px;font-size:12px;font-weight:700;color:#fff;background:var(--grad);
  border-radius:999px;padding:5px 13px;box-shadow:0 6px 14px -4px rgba(var(--brand-rgb),.4)}
.prod3-card h3{font-size:18px;font-weight:800;color:var(--ink);margin:0 0 8px}
.prod3-card .p3-sub{font-size:13px;color:var(--ink-light);line-height:1.7;margin:0 0 14px;min-height:46px}
.prod3-card .p3-price{font-size:23px;font-weight:800;color:var(--brand);margin:0 0 16px;letter-spacing:-.5px}
.prod3-card .p3-price small{font-size:12.5px;font-weight:400;color:var(--ink-faint);letter-spacing:0}
.prod3-go{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:700;color:#fff;background:var(--grad);
  border-radius:999px;padding:9px 20px;text-decoration:none;box-shadow:0 8px 18px -6px rgba(var(--brand-rgb),.42);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.prod3-card:hover .prod3-go{transform:translateY(-2px);box-shadow:0 12px 24px -6px rgba(var(--brand-rgb),.5)}
.prod3-go .arr{font-size:16px;line-height:1;transition:transform .2s var(--ease)}
.prod3-card:hover .prod3-go .arr{transform:translateX(4px)}
@media(max-width:900px){.prod3-grid{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.prod3-grid{grid-template-columns:1fr}}

/* ===== 首页服务入口卡立体增强 ===== */
.entry-card{box-shadow:0 1px 2px rgba(var(--brand-rgb),.04),0 12px 28px -12px rgba(var(--brand-rgb),.14)}
.entry-card::before{content:'';position:absolute;top:-46px;right:-46px;width:140px;height:140px;border-radius:50%;
  background:radial-gradient(circle,rgba(var(--brand-rgb),.09) 0%,transparent 70%)}
.entry-card:hover{transform:translateY(-8px);box-shadow:0 2px 4px rgba(var(--brand-rgb),.05),0 24px 44px -14px rgba(var(--brand-rgb),.24)}
.ec-ico{width:46px;height:46px;border-radius:14px;background:var(--grad);display:flex;align-items:center;justify-content:center;
  margin-bottom:14px;box-shadow:0 8px 18px -5px rgba(var(--brand-rgb),.42);transition:transform .28s var(--ease)}
.entry-card:hover .ec-ico{transform:translateY(-3px) scale(1.06)}
.ec-ico svg{width:23px;height:23px;stroke:#fff;stroke-width:16;stroke-linecap:round;stroke-linejoin:round;fill:none}
.ec-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-bg);
  border-radius:999px;padding:4px 11px;margin-top:12px}