/* ============================================================
   FormatLab 门户落地页 - 设计系统 v2
   风格：科大讯飞式浅色科技风（白底大留白 / 克制品牌蓝 / 清晰栅格）
   仅用于 /portal 页面
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 品牌蓝（600 主色 / 700 悬浮 / 800 深色 / 400 亮蓝 / 100·50 浅底） */
  --brand: #1E6BB8;
  --brand-hover: #155A9E;
  --brand-deep: #0F4C81;
  --brand-bright: #3B82F6;
  --brand-light: #60A5FA;
  --brand-tint: #EFF6FF;
  --brand-tint-2: #DBEAFE;

  /* 文本（纯黑标题体系，符合可读性要求） */
  --ink: #000000;
  --ink-2: #1f2937;
  --ink-3: #4b5563;
  --ink-4: #6b7280;

  /* 表面与线 */
  --surface: #ffffff;
  --surface-2: #f6f9fd;
  --surface-3: #eef4fb;
  --line: #e3eaf3;
  --line-strong: #cbd8e8;

  /* 语义色 */
  --success: #16a34a;
  --warning: #f59e0b;

  /* 圆角 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;
  --r-pill: 999px;

  /* 阴影（克制、冷灰） */
  --sh-sm: 0 1px 2px rgba(15, 76, 129, .05);
  --sh-md: 0 8px 24px rgba(15, 76, 129, .08);
  --sh-lg: 0 24px 60px rgba(15, 76, 129, .14);
  --sh-blue: 0 12px 32px rgba(30, 107, 184, .25);

  /* 字体 / 间距 / 动效 */
  --font-head: "Plus Jakarta Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Be Vietnam Pro", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--ink-2);
  background: var(--surface);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  color: var(--ink);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
}
p { color: var(--ink-3); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }

/* 栅格子项允许收缩，避免内部大图/长内容撑出横向滚动 */
.hero-grid > *, .scene-grid > *, .hub-grid > *, .feat-grid > *,
.about-card > *, .footer-grid > *, .why-list > *, .cta-box > * { min-width: 0; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-head);
  font-size: 15px; font-weight: 700;
  padding: 12px 24px; border-radius: var(--r-md);
  border: 1.5px solid transparent;
  cursor: pointer; white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              background-color .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
}
.btn svg { width: 17px; height: 17px; }
.btn-lg { padding: 14px 30px; font-size: 16px; }
.btn-primary { background: var(--brand); color: #fff; box-shadow: var(--sh-blue); }
.btn-primary:hover { background: var(--brand-hover); transform: translateY(-2px); }
.btn-ghost {
  background: #fff; color: var(--brand); border-color: var(--brand-tint-2);
}
.btn-ghost:hover { border-color: var(--brand); background: var(--brand-tint); transform: translateY(-2px); }
.btn-outline-light {
  background: transparent; color: #fff; border-color: rgba(255,255,255,.55);
}
.btn-outline-light:hover { background: rgba(255,255,255,.1); border-color: #fff; }
.btn-dark { background: var(--brand-deep); color: #fff; }
.btn-dark:hover { background: #0a3a63; transform: translateY(-2px); }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; }
.section.tint { background: var(--surface-2); }

.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-head);
  font-size: 13.5px; font-weight: 700; letter-spacing: .06em;
  color: var(--brand);
  background: var(--brand-tint);
  border: 1px solid var(--brand-tint-2);
  padding: 6px 14px; border-radius: var(--r-pill);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--brand-bright);
}
.section-head h2 { font-size: clamp(26px, 3.2vw, 36px); margin-bottom: 14px; }
.section-head p { font-size: 16.5px; color: var(--ink-3); }

/* ---------- 顶部导航 ---------- */
.main-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.main-header.scrolled { border-bottom-color: var(--line); box-shadow: 0 2px 16px rgba(15,76,129,.06); }
.navbar { display: flex; align-items: center; gap: 28px; height: 68px; }
.nav-brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.nav-brand img { height: 40px; width: auto; border-radius: 8px; }
.brand-name {
  font-family: var(--font-head); font-size: 17px; font-weight: 800; color: var(--ink);
  display: flex; flex-direction: column; line-height: 1.2;
}
.brand-name em {
  font-style: normal; font-size: 11px; font-weight: 500; color: var(--ink-4); letter-spacing: .02em;
}
.nav-menu { display: flex; align-items: center; gap: 30px; margin-left: auto; }
.nav-menu a {
  font-size: 15px; font-weight: 500; color: var(--ink-2);
  position: relative; padding: 4px 0;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--brand); }
.nav-menu a::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; border-radius: 2px; background: var(--brand);
  transition: width .25s var(--ease);
}
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }

/* ---------- 下拉导航（iFlytek 风格） ---------- */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle {
  display: inline-flex; align-items: center; gap: 4px;
  cursor: pointer;
}
.nav-dropdown-toggle svg {
  width: 14px; height: 14px; transition: transform .2s var(--ease);
}
.nav-dropdown:hover .nav-dropdown-toggle svg,
.nav-dropdown.open .nav-dropdown-toggle svg { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(8px);
  min-width: 260px; background: #fff;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--sh-lg); padding: 8px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  z-index: 200;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; border-radius: var(--r-md);
  transition: background .15s var(--ease);
}
.nav-dropdown-item:hover { background: var(--brand-tint); }
.nav-dropdown-item .nd-icon { font-size: 22px; flex-shrink: 0; width: 28px; text-align: center; }
.nav-dropdown-item b { display: block; font-size: 14px; font-weight: 700; color: var(--ink); line-height: 1.3; }
.nav-dropdown-item small { display: block; font-size: 12px; color: var(--ink-4); margin-top: 1px; }
.nav-dropdown-item::after { display: none !important; }
.nav-dropdown-item:hover::after { display: none !important; width: 0 !important; }
.nav-cta { flex-shrink: 0; display: flex; align-items: center; gap: 10px; }
.nav-cta .btn { padding: 10px 20px; font-size: 14px; }

/* 已登录：头像下拉菜单 */
.nav-user-menu { position: relative; flex-shrink: 0; }
.nav-user-menu[hidden] { display: none; }
.nav-user-btn {
  display: flex; align-items: center; gap: 6px;
  background: #fff; border: 1.5px solid var(--brand-tint-2); border-radius: 999px;
  padding: 4px 10px 4px 4px; cursor: pointer;
  transition: border-color .2s, box-shadow .2s;
}
.nav-user-btn:hover { border-color: var(--brand); box-shadow: var(--sh-md); }
.nav-user-btn img, .nav-user-fallback { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.nav-user-name { font-size: 14px; font-weight: 600; color: var(--ink); max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-user-fallback {
  align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1E6BB8, #3B82F6);
  color: #fff; font-weight: 700; font-size: 14px;
}
.nav-user-btn > svg { width: 14px; height: 14px; color: var(--ink-4); }
.nav-user-dropdown {
  position: absolute; top: calc(100% + 10px); right: 0; min-width: 168px;
  background: #fff; border-radius: 12px; box-shadow: var(--sh-lg); border: 1px solid var(--line);
  padding: 8px; z-index: 300;
}
.nav-user-dropdown a {
  display: block; padding: 10px 14px; border-radius: 8px;
  font-size: 14px; font-weight: 600; color: var(--ink);
}
.nav-user-dropdown a:hover { background: var(--brand-tint); color: var(--brand); }
.nav-user-dropdown a::after { display: none !important; }
.nav-toggle {
  display: none; margin-left: auto;
  background: none; border: 0; font-size: 22px; color: var(--ink); cursor: pointer; line-height: 1;
}

/* ---------- Hero（浅色科技风） ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 480px at 88% -10%, rgba(59,130,246,.14), transparent 60%),
    radial-gradient(700px 420px at -8% 18%, rgba(30,107,184,.08), transparent 60%),
    linear-gradient(180deg, #f4f9ff 0%, #ffffff 92%);
  padding: 84px 0 92px;
}
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 56px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  background: #fff; border: 1px solid var(--brand-tint-2);
  box-shadow: var(--sh-sm);
  color: var(--brand-deep); font-weight: 600; font-size: 13.5px;
  padding: 7px 15px; border-radius: var(--r-pill); margin-bottom: 22px;
}
.hero-badge img { height: 20px; width: 20px; border-radius: 5px; }
.hero h1 { font-size: clamp(32px, 4.4vw, 50px); letter-spacing: -.02em; margin-bottom: 20px; }
.hero h1 .hl {
  color: var(--brand);
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-bright) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 17px; line-height: 1.85; color: var(--ink-3); max-width: 520px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 44px; }
.hero-stat b {
  display: block; font-family: var(--font-head); font-size: 32px; font-weight: 800;
  color: var(--brand); line-height: 1.1;
}
.hero-stat span { font-size: 13.5px; color: var(--ink-4); }

/* 右侧产品浏览器窗 */
.hero-visual { position: relative; animation: heroFloatY 7s ease-in-out infinite; }
.browser-frame {
  background: #fff; border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  border: 1px solid var(--line);
  overflow: hidden;
}
.browser-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px; background: #f8fbff; border-bottom: 1px solid var(--line);
}
.browser-bar i { width: 11px; height: 11px; border-radius: 50%; background: #d7e2f0; }
.browser-bar i:first-child { background: #fb7185; }
.browser-bar i:nth-child(2) { background: #fbbf24; }
.browser-bar i:nth-child(3) { background: #34d399; }
.browser-bar .url {
  margin-left: 10px; flex: 1; height: 22px; border-radius: 6px;
  background: #eef4fb; display: flex; align-items: center;
  font-size: 11.5px; color: var(--ink-4); padding: 0 10px;
}
.browser-frame img { width: 100%; }
.float-card {
  position: absolute; background: #fff; border: 1px solid var(--line);
  border-radius: var(--r-md); box-shadow: var(--sh-md);
  padding: 11px 15px; display: flex; align-items: center; gap: 11px;
  animation: floatCard 6s ease-in-out infinite;
}
.float-card .fc-ico {
  width: 38px; height: 38px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.float-card .fc-ico svg { width: 20px; height: 20px; stroke-width: 2; }
.float-card .fc-ico.blue { background: var(--brand-tint); color: var(--brand); }
.float-card .fc-ico.green { background: #e9f9f0; color: var(--success); }
.float-card b { display: block; font-family: var(--font-head); font-size: 14px; color: var(--ink); }
.float-card span { font-size: 12px; color: var(--ink-4); }
.float-card.f1 { left: -26px; top: 26%; }
.float-card.f2 { right: -22px; bottom: 12%; animation-delay: -3s; }
@keyframes heroFloatY { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes floatCard { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ---------- 信任条 ---------- */
.trustbar { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.trustbar .container { display: flex; justify-content: space-around; gap: 20px; padding-top: 26px; padding-bottom: 26px; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 10px; color: var(--ink-2); font-weight: 600; font-size: 14.5px; }
.trust-item svg { width: 19px; height: 19px; stroke: var(--brand); stroke-width: 2; }

/* ---------- 一站式服务（两大入口） ---------- */
.hub-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.hub-card {
  position: relative; overflow: hidden;
  border-radius: var(--r-xl); padding: 40px 38px;
  border: 1px solid var(--line); background: #fff;
  box-shadow: var(--sh-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  display: flex; flex-direction: column;
}
.hub-card:hover { transform: translateY(-6px); box-shadow: var(--sh-lg); border-color: var(--brand-tint-2); }
.hub-card::after {
  content: ""; position: absolute; right: -70px; top: -70px;
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,.12), transparent 70%);
}
.hub-card.deep { background: linear-gradient(150deg, #0F4C81 0%, #1E6BB8 100%); border-color: transparent; }
.hub-card.deep::after { background: radial-gradient(circle, rgba(255,255,255,.14), transparent 70%); }
.hub-icon {
  width: 58px; height: 58px; border-radius: 15px;
  display: flex; align-items: center; justify-content: center;
  background: var(--brand-tint); color: var(--brand);
  margin-bottom: 22px;
}
.hub-icon svg { width: 29px; height: 29px; }
.hub-card.deep .hub-icon { background: rgba(255,255,255,.16); color: #fff; }
.hub-card h3 { font-size: 23px; margin-bottom: 10px; }
.hub-card > p { font-size: 15.5px; margin-bottom: 22px; }
.hub-card.deep h3, .hub-card.deep > p { color: #fff; }
.hub-card.deep > p { color: rgba(255,255,255,.82); }
.hub-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.hub-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13.5px; font-weight: 600;
  padding: 7px 14px; border-radius: var(--r-pill);
  background: var(--brand-tint); color: var(--brand-deep);
  border: 1px solid var(--brand-tint-2);
}
.hub-chip svg { width: 13px; height: 13px; stroke-width: 2.6; }
.hub-card.deep .hub-chip {
  background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.25);
}
.hub-link {
  margin-top: auto; display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-head); font-weight: 700; font-size: 15px;
  color: var(--brand);
}
.hub-link svg { width: 17px; height: 17px; transition: transform .25s var(--ease); }
.hub-card:hover .hub-link svg { transform: translateX(5px); }
.hub-card.deep .hub-link { color: #fff; }

/* ---------- 核心功能卡 ---------- */
.feat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feat-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 30px 26px; box-shadow: var(--sh-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  display: flex; flex-direction: column; height: 100%;
}
.feat-card:hover { transform: translateY(-6px); box-shadow: var(--sh-md); border-color: var(--brand-tint-2); }
.feat-icon {
  width: 52px; height: 52px; border-radius: 14px; margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center;
}
.feat-icon svg { width: 25px; height: 25px; }
.feat-icon.b1 { background: var(--brand-tint); color: var(--brand); }
.feat-icon.b2 { background: #ecf5ff; color: #2576d8; }
.feat-icon.b3 { background: #f0f0ff; color: #5b5bd6; }
.feat-icon.b4 { background: #e9f9f0; color: var(--success); }
.feat-card h4 { font-size: 17.5px; margin-bottom: 9px; }
.feat-card p { font-size: 14px; line-height: 1.75; margin-bottom: 18px; flex: 1; }
.feat-link { font-size: 14px; font-weight: 700; color: var(--brand); display: inline-flex; align-items: center; gap: 6px; }
.feat-link svg { width: 14px; height: 14px; transition: transform .25s var(--ease); }
.feat-card:hover .feat-link svg { transform: translateX(4px); }

/* ---------- 场景图文带（为什么选择我们） ---------- */
.scene-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; align-items: center; }
.scene-photo {
  position: relative; border-radius: var(--r-xl); overflow: hidden;
  box-shadow: var(--sh-lg); border: 1px solid var(--line);
  background: var(--surface-3); aspect-ratio: 16 / 10;
}
.scene-photo img { width: 100%; height: 100%; object-fit: cover; }
.scene-photo .photo-tag {
  position: absolute; left: 18px; bottom: 18px;
  background: rgba(255,255,255,.94); backdrop-filter: blur(6px);
  border-radius: var(--r-md); padding: 10px 16px;
  font-size: 13.5px; font-weight: 700; color: var(--brand-deep);
  box-shadow: var(--sh-md);
}
.why-list { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 22px; margin-top: 28px; }
.why-item { display: flex; gap: 13px; }
.why-ico {
  flex-shrink: 0; width: 42px; height: 42px; border-radius: 12px;
  background: var(--brand-tint); color: var(--brand);
  display: flex; align-items: center; justify-content: center;
}
.why-ico svg { width: 21px; height: 21px; }
.why-item h5 { font-size: 15.5px; margin-bottom: 3px; }
.why-item p { font-size: 13.5px; line-height: 1.65; }

/* ---------- 关于我们 ---------- */
.about-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-xl);
  box-shadow: var(--sh-sm); overflow: hidden;
  display: grid; grid-template-columns: .92fr 1.08fr;
}
.about-photo { position: relative; min-height: 420px; background: var(--surface-3); }
.about-photo img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.about-body { padding: 46px 46px 42px; }
.about-body h2 { font-size: 28px; margin: 12px 0 8px; }
.about-role { color: var(--brand); font-weight: 700; font-size: 16px; margin-bottom: 18px; font-family: var(--font-head); }
.about-body > p { font-size: 15px; line-height: 1.85; margin-bottom: 24px; }
.about-blocks { display: grid; gap: 16px; }
.about-block {
  display: flex; gap: 14px;
  padding: 16px 18px; border-radius: var(--r-md);
  background: var(--surface-2); border: 1px solid var(--line);
}
.about-block .ab-ico {
  flex-shrink: 0; width: 40px; height: 40px; border-radius: 11px;
  background: var(--brand-tint); color: var(--brand);
  display: flex; align-items: center; justify-content: center;
}
.about-block .ab-ico svg { width: 20px; height: 20px; }
.about-block h5 { font-size: 15px; margin-bottom: 3px; }
.about-block p { font-size: 13.5px; line-height: 1.7; }

/* ---------- CTA 带 ---------- */
.cta-wrap { padding: 40px 0 96px; }
.cta-box {
  position: relative; overflow: hidden;
  border-radius: var(--r-xl);
  background: linear-gradient(120deg, #0F4C81 0%, #1E6BB8 58%, #2f7fd1 100%);
  padding: 64px 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
  box-shadow: var(--sh-lg);
}
.cta-box::before, .cta-box::after {
  content: ""; position: absolute; border-radius: 50%;
  background: rgba(255,255,255,.07);
}
.cta-box::before { width: 340px; height: 340px; right: -90px; top: -160px; }
.cta-box::after { width: 220px; height: 220px; right: 180px; bottom: -140px; }
.cta-box h2 { color: #fff; font-size: clamp(24px, 2.8vw, 32px); margin-bottom: 10px; }
.cta-box p { color: rgba(255,255,255,.85); font-size: 16px; }
.cta-actions { display: flex; gap: 14px; flex-shrink: 0; position: relative; z-index: 1; }

/* ---------- 页脚 ---------- */
.footer { background: #0c1f36; color: #c6d2e2; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer-brand img { height: 42px; border-radius: 8px; margin-bottom: 16px; }
.footer-brand p { color: #93a5bd; font-size: 13.5px; line-height: 1.8; margin-bottom: 16px; }
.footer-qr { display: flex; align-items: center; gap: 12px; }
.footer-qr img { width: 84px; height: 84px; border-radius: 10px; background: #fff; padding: 5px; object-fit: cover; }
.footer-qr span { font-size: 12.5px; color: #93a5bd; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 18px; }
.footer-links a {
  display: block; color: #93a5bd; font-size: 14px; padding: 5px 0;
  transition: color .2s var(--ease);
}
.footer-links a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 12px; font-size: 13.5px; color: #93a5bd; }
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; stroke: #7fb0e0; }
.footer-contact a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.09);
  padding: 20px 0;
}
.footer-bottom .container { display: flex; flex-direction: column; gap: 6px; }
.footer-bottom p { font-size: 12.5px; color: #7488a2; line-height: 1.7; }
.footer-bottom a { color: #93a5bd; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 返回顶部 ---------- */
.scroll-top {
  position: fixed; right: 28px; bottom: 28px; z-index: 90;
  width: 46px; height: 46px; border-radius: 12px; border: 1px solid var(--line);
  background: #fff; color: var(--brand); box-shadow: var(--sh-md);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all .3s var(--ease);
}
.scroll-top svg { width: 20px; height: 20px; }
.scroll-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-top:hover { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ---------- AOS 滚动入场 ---------- */
[data-aos] {
  opacity: 0; transform: translateY(26px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
[data-aos].aos-animate { opacity: 1; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-grid { gap: 40px; }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 900px) {
  .section { padding: 72px 0; }
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: flex-start; gap: 0;
    padding: 8px 24px 16px; margin-left: 0;
    box-shadow: var(--sh-md);
    display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { width: 100%; padding: 13px 0; border-bottom: 1px solid var(--surface-3); }
  .nav-menu a::after { display: none; }
  .nav-dropdown { width: 100%; }
  .nav-dropdown-toggle { width: 100%; justify-content: space-between; padding: 13px 0; border-bottom: 1px solid var(--surface-3); }
  .nav-dropdown-menu {
    position: static; transform: none; opacity: 1; visibility: visible; pointer-events: auto;
    box-shadow: none; border: none; border-radius: 0; padding: 0 0 0 16px;
    display: none;
  }
  .nav-dropdown.open .nav-dropdown-menu { display: block; }
  .nav-cta { display: none; }
  .hero { padding: 56px 0 64px; }
  .hero-grid, .scene-grid { grid-template-columns: 1fr; gap: 44px; }
  .hub-grid { grid-template-columns: 1fr; }
  .about-card { grid-template-columns: 1fr; }
  .about-photo { min-height: 260px; }
  .about-body { padding: 34px 28px; }
  .cta-box { flex-direction: column; align-items: flex-start; padding: 44px 32px; }
  .float-card.f1 { left: 6px; }
  .float-card.f2 { right: 6px; }
}
@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .hero-stats { gap: 26px; flex-wrap: wrap; }
  .hero-stat b { font-size: 26px; }
  .trustbar .container { gap: 14px 26px; justify-content: flex-start; }
  .feat-grid { grid-template-columns: 1fr; }
  .why-list { grid-template-columns: 1fr; }
  .hub-card { padding: 32px 26px; }
  .cta-actions { width: 100%; flex-direction: column; }
  .cta-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .brand-name em { display: none; }
}

/* 尊重减少动态效果偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-aos] { opacity: 1; transform: none; }
}