/* ============================================================
   HelloWord 官网全局样式（浅色 · 蓝色科技风 · 响应式）
   ============================================================ */
:root {
  --bg: #FFFFFF;
  --soft: #F5F8FF;
  --soft-2: #EDF3FF;
  --ink: #0B1220;
  --text: #1E293B;
  --muted: #64748B;
  --line: #E2E9F5;
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --accent: #06B6D4;
  --grad: linear-gradient(120deg, #2563EB 0%, #06B6D4 100%);
  --radius: 18px;
  --radius-sm: 12px;
  --shadow-sm: 0 6px 20px -12px rgba(15, 40, 90, 0.18);
  --shadow: 0 22px 48px -24px rgba(15, 40, 90, 0.28);
  --header-h: 72px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
::selection { background: rgba(37, 99, 235, 0.16); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px; font-size: 15.5px; font-weight: 600;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 12px 26px -12px rgba(37, 99, 235, 0.7); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 34px -12px rgba(6, 182, 212, 0.55); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.btn-sm { padding: 9px 22px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-lg { padding: 15px 38px; font-size: 16.5px; }

/* ---------- 头部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: var(--header-h);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s ease, border-color .3s ease;
}
.site-header.scrolled { border-bottom-color: var(--line); box-shadow: 0 8px 24px -20px rgba(15, 40, 90, 0.4); }
.nav-wrap { display: flex; align-items: center; height: var(--header-h); gap: 26px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; letter-spacing: 0.01em; color: var(--ink); }
.brand img { width: 34px; height: 34px; }
.main-nav { display: flex; gap: 4px; margin-left: auto; }
.main-nav a {
  padding: 8px 15px; border-radius: 8px; font-size: 15.5px; color: var(--muted);
  transition: color .2s ease, background .2s ease; position: relative;
}
.main-nav a:hover { color: var(--primary); background: var(--soft); }
.main-nav a.active { color: var(--primary); font-weight: 600; }
.main-nav a.active::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 0; height: 2.5px;
  border-radius: 2px; background: var(--grad);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s ease, opacity .3s ease; }
.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; overflow: hidden; text-align: center;
  padding: calc(var(--header-h) + 76px) 0 0;
  background:
    radial-gradient(720px 400px at 18% 0%, rgba(37, 99, 235, 0.12), transparent 68%),
    radial-gradient(660px 380px at 84% 12%, rgba(6, 182, 212, 0.12), transparent 68%),
    linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 78%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(37, 99, 235, 0.055) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(37, 99, 235, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(62% 52% at 50% 26%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(62% 52% at 50% 26%, #000 30%, transparent 100%);
}
.hero .container { position: relative; z-index: 1; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 18px; border-radius: 999px;
  font-size: 13.5px; color: var(--primary-dark); background: #fff;
  border: 1px solid #DBE7FF; box-shadow: var(--shadow-sm); margin-bottom: 26px;
}
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(6, 182, 212, 0.16); }
.hero h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.2; font-weight: 800; letter-spacing: -0.01em; color: var(--ink); margin-bottom: 22px; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: clamp(16px, 2vw, 18.5px); color: var(--muted); max-width: 720px; margin: 0 auto 34px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 44px; }
.hero-note { color: var(--muted); font-size: 13.5px; margin-top: -24px; margin-bottom: 40px; }
.hero-media { position: relative; max-width: 1020px; margin: 0 auto -70px; }
.hero-media img {
  width: 100%; border-radius: 22px; border: 1px solid #E6EEFF;
  box-shadow: 0 40px 80px -40px rgba(15, 40, 90, 0.45);
}
.hero-media::before {
  content: ""; position: absolute; inset: -3px; border-radius: 24px; z-index: -1;
  background: var(--grad); filter: blur(38px); opacity: 0.22;
}

/* ---------- 数据条 ---------- */
.stats-band { background: #fff; padding: 118px 0 56px; border-bottom: 1px solid var(--line); }
.hero + .stats-band { background: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat .num { font-size: clamp(28px, 3.6vw, 40px); font-weight: 800; color: var(--ink); }
.stat .num span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .label { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* ---------- 通用 Section ---------- */
.section { padding: 96px 0; position: relative; }
.section-soft { background: var(--soft); }
.section-head { text-align: center; max-width: 740px; margin: 0 auto 56px; }
.section-tag {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--primary); background: var(--soft-2);
  padding: 5px 14px; border-radius: 999px; margin-bottom: 16px;
}
.section-head h2 { font-size: clamp(27px, 3.4vw, 40px); font-weight: 800; line-height: 1.28; color: var(--ink); margin-bottom: 16px; }
.section-head p { color: var(--muted); font-size: 17px; }

/* ---------- 场景切换 ---------- */
.scenario-tabs { display: grid; grid-template-columns: 0.92fr 1.28fr; gap: 48px; align-items: center; }
.tabs-list { display: flex; flex-direction: column; gap: 6px; }
.tab-btn {
  display: flex; align-items: center; gap: 16px; text-align: left; width: 100%;
  padding: 16px 20px; border-radius: var(--radius-sm); color: var(--muted);
  font-size: 16.5px; font-weight: 500; transition: all .25s ease; border: 1px solid transparent;
}
.tab-btn .num {
  font-family: var(--mono); font-size: 13px; font-weight: 700; color: #A9B7D0;
  transition: color .25s ease;
}
.tab-btn:hover { background: #fff; border-color: var(--line); color: var(--text); }
.tab-btn.active { background: #fff; border-color: #D7E4FF; color: var(--primary-dark); font-weight: 700; box-shadow: var(--shadow-sm); }
.tab-btn.active .num { color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp .45s ease both; }
.tab-panel img {
  width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: var(--radius); border: 1px solid #E6EEFF; box-shadow: var(--shadow);
}
.tab-panel .panel-caption { margin-top: 20px; }
.tab-panel .panel-caption h3 { font-size: 20px; color: var(--ink); margin-bottom: 6px; }
.tab-panel .panel-caption p { color: var(--muted); font-size: 15px; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---------- 下载卡片 ---------- */
.dl-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.dl-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 26px; text-align: center; display: flex; flex-direction: column; gap: 10px;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.dl-card:hover { transform: translateY(-6px); border-color: #C9DCFF; box-shadow: var(--shadow); }
.dl-card .os-icon { font-size: 40px; line-height: 1; margin-bottom: 2px; }
.dl-card h3 { font-size: 19px; color: var(--ink); }
.dl-card .ver { color: var(--muted); font-size: 13px; font-family: var(--mono); }
.dl-links { display: flex; flex-direction: column; gap: 9px; margin-top: 8px; }
.dl-links a {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px; font-size: 14px; border: 1px solid var(--line);
  background: #fff; color: var(--text); transition: all .25s ease;
}
.dl-links a:hover { border-color: var(--primary); color: var(--primary); }
.dl-links a .size { color: #94A3B8; font-size: 12px; font-family: var(--mono); }
.dl-links a.dl-main { background: var(--grad); border-color: transparent; color: #fff; font-weight: 600; justify-content: center; }
.dl-links a.dl-main .size { color: rgba(255, 255, 255, 0.85); }
.dl-links a.dl-main:hover { color: #fff; filter: brightness(1.06); }

/* ---------- 产品优势 ---------- */
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.adv-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 26px; text-align: center; transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #D7E4FF; }
.adv-card img { width: 84px; height: 84px; object-fit: contain; margin: 0 auto 18px; }
.adv-card h3 { font-size: 18px; color: var(--ink); margin-bottom: 8px; }
.adv-card p { color: var(--muted); font-size: 14.5px; }

/* ---------- 用户反馈 ---------- */
.reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 28px; display: flex; flex-direction: column; gap: 16px;
  transition: transform .3s ease, box-shadow .3s ease;
}
.review-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.review-stars { color: #F59E0B; letter-spacing: 3px; font-size: 15px; }
.review-card blockquote { color: var(--text); font-size: 15px; flex: 1; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-author .avatar {
  width: 44px; height: 44px; border-radius: 50%; flex: 0 0 44px;
  background: var(--grad); display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: #fff; font-size: 15px;
}
.review-author .name { font-weight: 600; font-size: 15px; color: var(--ink); }
.review-author .role { color: var(--muted); font-size: 13px; }

/* ---------- 图文分栏 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.split.reverse .split-media { order: 2; }
.split-media img { border-radius: var(--radius); border: 1px solid #E6EEFF; box-shadow: var(--shadow); }
.split-body h2 { font-size: clamp(26px, 3.1vw, 36px); font-weight: 800; line-height: 1.32; color: var(--ink); margin-bottom: 18px; }
.split-body > p { color: var(--muted); margin-bottom: 24px; }
.check-list li { display: flex; gap: 12px; margin-bottom: 13px; color: var(--text); font-size: 15.5px; }
.check-list li::before {
  content: "✓"; flex: 0 0 22px; height: 22px; border-radius: 50%;
  background: #E6F0FF; color: var(--primary); display: inline-flex; align-items: center;
  justify-content: center; font-size: 12px; font-weight: 800; margin-top: 3px;
}

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 28px; transition: transform .3s ease, box-shadow .3s ease;
}
.step:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-family: var(--mono); font-size: 32px; font-weight: 800;
  color: var(--primary); opacity: .28; display: block; margin-bottom: 12px;
}
.step h3 { font-size: 18px; color: var(--ink); margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; }

/* ---------- 博客卡片 ---------- */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.blog-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column; transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.blog-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #D7E4FF; }
.blog-card .bc-img { aspect-ratio: 16 / 9; overflow: hidden; }
.blog-card .bc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.blog-card:hover .bc-img img { transform: scale(1.05); }
.blog-card .bc-body { padding: 22px 24px 26px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.blog-meta { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.blog-tag { color: var(--primary); background: #EAF1FF; padding: 2px 10px; border-radius: 999px; font-size: 12.5px; }
.blog-card h3 { font-size: 18px; line-height: 1.5; color: var(--ink); }
.blog-card h3 a:hover { color: var(--primary); }
.blog-card p { color: var(--muted); font-size: 14.5px; flex: 1; }
.blog-more { color: var(--primary); font-size: 14px; font-weight: 600; }
.blog-more:hover { text-decoration: underline; }
.blog-filters { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 44px; }
.filter-chip {
  padding: 8px 20px; border-radius: 999px; font-size: 14px; color: var(--muted);
  border: 1px solid var(--line); background: #fff; transition: all .25s ease;
}
.filter-chip:hover { color: var(--primary); border-color: var(--primary); }
.filter-chip.active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------- FAQ ---------- */
.faq-wrap { display: grid; grid-template-columns: 1fr 1.6fr; gap: 52px; align-items: start; }
.faq-side img { border-radius: var(--radius); border: 1px solid #E6EEFF; box-shadow: var(--shadow); }
.faq-side .side-card { background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; margin-top: 22px; }
.faq-side .side-card h3 { font-size: 18px; color: var(--ink); margin-bottom: 8px; }
.faq-side .side-card p { color: var(--muted); font-size: 14.5px; margin-bottom: 18px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; transition: border-color .25s ease, box-shadow .25s ease; }
.faq-item.open { border-color: #C9DCFF; box-shadow: var(--shadow-sm); }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 19px 24px; font-size: 16.5px; font-weight: 600; text-align: left; color: var(--ink);
}
.faq-q .icon { flex: 0 0 22px; width: 22px; height: 22px; position: relative; }
.faq-q .icon::before, .faq-q .icon::after {
  content: ""; position: absolute; top: 50%; left: 50%; background: var(--primary); border-radius: 2px;
  transition: transform .3s ease;
}
.faq-q .icon::before { width: 14px; height: 2px; transform: translate(-50%, -50%); }
.faq-q .icon::after { width: 2px; height: 14px; transform: translate(-50%, -50%); }
.faq-item.open .faq-q .icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a .faq-a-inner { padding: 0 24px 20px; color: var(--muted); font-size: 15px; }

/* ---------- CTA ---------- */
.cta-banner {
  position: relative; border-radius: 24px; overflow: hidden; text-align: center; padding: 68px 40px;
  border: 1px solid #DCE8FF;
  background:
    radial-gradient(520px 260px at 15% 0%, rgba(37, 99, 235, 0.16), transparent 70%),
    radial-gradient(520px 260px at 85% 100%, rgba(6, 182, 212, 0.16), transparent 70%),
    #F7FAFF;
}
.cta-banner h2 { font-size: clamp(25px, 3.2vw, 36px); font-weight: 800; color: var(--ink); margin-bottom: 14px; }
.cta-banner p { color: var(--muted); max-width: 580px; margin: 0 auto 30px; font-size: 16px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0B1220; color: #C7D2E5; padding: 68px 0 0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr 1.4fr; gap: 36px; padding-bottom: 48px; }
.footer-brand .brand { color: #fff; }
.footer-brand p { color: #93A3BE; font-size: 14px; margin: 16px 0 0; max-width: 300px; }
.footer-col h4 { font-size: 14.5px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #93A3BE; font-size: 14px; transition: color .2s ease; }
.footer-col a:hover { color: #7DD3FC; }
.newsletter p { color: #93A3BE; font-size: 14px; margin-bottom: 14px; }
.newsletter-form { display: flex; gap: 8px; }
.newsletter-form input {
  flex: 1; min-width: 0; background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px; padding: 10px 16px; color: #fff; font-size: 14px; outline: none;
}
.newsletter-form input::placeholder { color: #7A8AA6; }
.newsletter-form input:focus { border-color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.09); padding: 20px 0; display: flex;
  justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
  color: #93A3BE; font-size: 13.5px;
}
.footer-bottom a { color: #93A3BE; }
.footer-bottom a:hover { color: #7DD3FC; }

/* ---------- 子页面头 ---------- */
.page-hero { padding: calc(var(--header-h) + 66px) 0 58px; text-align: center; position: relative; overflow: hidden;
  background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%); }
.page-hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(560px 260px at 22% 6%, rgba(37, 99, 235, 0.12), transparent 66%),
    radial-gradient(520px 240px at 80% 10%, rgba(6, 182, 212, 0.12), transparent 66%);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(31px, 4.2vw, 46px); font-weight: 800; color: var(--ink); margin-bottom: 16px; line-height: 1.3; }
.page-hero p { color: var(--muted); font-size: 17px; max-width: 680px; margin: 0 auto; }
.breadcrumb { display: flex; gap: 8px; justify-content: center; font-size: 13.5px; color: var(--muted); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span[aria-current] { color: var(--primary); }

/* ---------- 表格 / 更新日志 ---------- */
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.spec-table th, .spec-table td { padding: 15px 22px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--line); }
.spec-table th { background: var(--soft); font-weight: 700; color: var(--ink); }
.spec-table td { color: var(--muted); }
.spec-table tr:last-child td { border-bottom: none; }
.changelog { display: flex; flex-direction: column; gap: 20px; }
.changelog-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 30px; }
.changelog-item .cl-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }
.changelog-item .cl-ver { font-family: var(--mono); font-size: 19px; font-weight: 700; color: var(--primary); }
.changelog-item .cl-date { color: var(--muted); font-size: 13.5px; }
.changelog-item .cl-badge { font-size: 12px; padding: 2px 10px; border-radius: 999px; background: #EAF1FF; color: var(--primary-dark); }
.changelog-item ul li { color: var(--muted); font-size: 14.5px; padding-left: 18px; position: relative; margin-bottom: 7px; }
.changelog-item ul li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ---------- 关于我们 ---------- */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(180deg, var(--primary), var(--accent)); border-radius: 2px; }
.tl-item { position: relative; padding-bottom: 38px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -32px; top: 7px; width: 14px; height: 14px; border-radius: 50%;
  background: #fff; border: 3px solid var(--primary); box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}
.tl-item .tl-year { font-family: var(--mono); font-weight: 700; color: var(--primary); font-size: 15px; margin-bottom: 5px; }
.tl-item h3 { font-size: 18px; color: var(--ink); margin-bottom: 7px; }
.tl-item p { color: var(--muted); font-size: 15px; }
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.value-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 24px; text-align: center; transition: transform .3s ease, box-shadow .3s ease; }
.value-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.value-card .v-icon { font-size: 32px; margin-bottom: 12px; }
.value-card h3 { font-size: 17px; color: var(--ink); margin-bottom: 7px; }
.value-card p { color: var(--muted); font-size: 14px; }
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.team-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 22px; text-align: center; transition: transform .3s ease, box-shadow .3s ease; }
.team-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.team-card .avatar {
  width: 74px; height: 74px; border-radius: 50%; margin: 0 auto 16px; background: var(--grad);
  display: flex; align-items: center; justify-content: center; font-size: 25px; font-weight: 800; color: #fff;
}
.team-card h3 { font-size: 17px; color: var(--ink); }
.team-card .role { color: var(--primary); font-size: 13.5px; margin: 3px 0 10px; }
.team-card p { color: var(--muted); font-size: 13.5px; }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%; background: var(--grad); color: #fff;
  font-size: 19px; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 12px 26px -10px rgba(37, 99, 235, 0.7);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s;
}
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { transform: translateY(-3px); }

/* ---------- 滚动动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: .1s; }
.reveal-d2 { transition-delay: .2s; }
.reveal-d3 { transition-delay: .3s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .dl-cards, .advantages-grid, .values-grid, .team-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews, .blog-grid, .steps { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .faq-wrap { grid-template-columns: 1fr; }
  .faq-side { max-width: 620px; margin: 0 auto; }
  .split { grid-template-columns: 1fr; gap: 34px; }
  .split.reverse .split-media { order: 0; }
  .scenario-tabs { grid-template-columns: 1fr; gap: 30px; }
  .tabs-list { flex-direction: row; overflow-x: auto; gap: 8px; padding-bottom: 4px; }
  .tab-btn { white-space: nowrap; padding: 12px 16px; font-size: 15px; }
  .hero-media { margin-bottom: -40px; }
  .stats-band { padding-top: 84px; }
}
@media (max-width: 768px) {
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; gap: 4px; padding: 16px 24px 24px;
    background: rgba(255, 255, 255, 0.98); border-bottom: 1px solid var(--line);
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: all .3s ease;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav a { padding: 12px 14px; font-size: 16px; }
  .nav-toggle { display: flex; }
  .nav-actions .btn { display: none; }
  .section { padding: 68px 0; }
  .hero { padding-top: calc(var(--header-h) + 52px); }
  .hero-media { margin-bottom: -24px; }
  .stats-band { padding-top: 62px; }
}
@media (max-width: 560px) {
  .dl-cards, .advantages-grid, .reviews, .blog-grid, .steps,
  .values-grid, .team-grid, .stats-grid, .footer-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .dl-card { padding: 26px 22px; }
}