/* ============================================================
   小智AI 服务端 —— 官网前台样式
   风格：现代 · 轻量化 · 清凉冷色（青 · 薄荷 · 紫）
   无任何外部字体/图标依赖，全部内联 SVG 与系统字体
   ============================================================ */

:root {
  /* 品牌冷色 */
  --s-brand:      #0ea5b7;
  --s-brand-d:    #0b8695;
  --s-cyan:       #22d3ee;
  --s-mint:       #2ee6c5;
  --s-violet:     #7c6cf6;
  --s-blue:       #3aa8f5;

  /* 中性 */
  --s-ink:        #0a1c26;
  --s-ink2:       #51707f;
  --s-ink3:       #8ba7b4;
  --s-bg:         #f4fafd;
  --s-surface:    #ffffff;
  --s-surface-2:  #f8fcfd;
  --s-line:       #e3eef4;
  --s-line2:      #d2e4ec;

  /* 渐变 */
  --s-grad:       linear-gradient(118deg, #18c7d4 0%, #3aa8f5 50%, #7c6cf6 100%);
  --s-grad-2:     linear-gradient(118deg, #2ee6c5 0%, #22d3ee 100%);
  --s-grad-soft:  linear-gradient(118deg, rgba(24,199,212,.10), rgba(124,108,246,.10));

  --s-r-sm:  10px;
  --s-r:     14px;
  --s-r-lg:  20px;
  --s-r-xl:  26px;
  --s-sh-1:  0 1px 2px rgba(10,44,60,.05);
  --s-sh-2:  0 6px 20px rgba(10,44,60,.07);
  --s-sh-3:  0 20px 48px rgba(10,44,60,.10);
  --s-max:   1160px;

  --s-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
            "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --s-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Consolas, monospace;
}

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

body {
  font-family: var(--s-font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--s-ink);
  background: var(--s-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 顶部与左下的柔和冷色光晕，营造清凉感 */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  background:
    radial-gradient(760px 460px at 8% -8%,  rgba(34,211,238,.20), transparent 62%),
    radial-gradient(680px 420px at 96% 2%,  rgba(124,108,246,.16), transparent 60%),
    radial-gradient(720px 520px at 50% 108%, rgba(46,230,197,.14), transparent 62%);
}

a { color: var(--s-brand-d); text-decoration: none; }
a:hover { color: var(--s-brand); }
h1,h2,h3,h4 { margin: 0; font-weight: 650; letter-spacing: -.015em; line-height: 1.28; }
p  { margin: 0 0 12px; }
ul { margin: 0; padding: 0; list-style: none; }
code, .mono { font-family: var(--s-mono); font-size: 13px; }
img, svg { max-width: 100%; }

.wrap { width: 100%; max-width: var(--s-max); margin: 0 auto; padding: 0 22px; position: relative; z-index: 1; }

/* ---------------- 通用文字 ---------------- */
.grad-text {
  background: var(--s-grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; font-weight: 600; letter-spacing: .06em;
  color: var(--s-brand-d); text-transform: uppercase;
}
.eyebrow::before {
  content: ""; width: 20px; height: 2px; border-radius: 2px;
  background: var(--s-grad);
}
.h2 { font-size: 32px; letter-spacing: -.02em; }
.h3 { font-size: 19px; }
.lead { font-size: 16px; color: var(--s-ink2); line-height: 1.8; }
.muted { color: var(--s-ink2); }
.small { font-size: 13px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 20px;
  border: 1px solid transparent; border-radius: 999px;
  font-size: 14.5px; font-weight: 550; font-family: inherit;
  cursor: pointer; white-space: nowrap;
  transition: transform .16s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn svg { width: 16px; height: 16px; flex: 0 0 16px; }
.btn--primary {
  color: #fff; background: var(--s-grad);
  box-shadow: 0 8px 22px rgba(24,199,212,.30), 0 2px 6px rgba(58,168,245,.22);
}
.btn--primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 12px 28px rgba(24,199,212,.38); }
.btn--ghost { color: var(--s-ink); background: rgba(255,255,255,.72); border-color: var(--s-line2); backdrop-filter: blur(8px); }
.btn--ghost:hover { color: var(--s-brand-d); border-color: var(--s-brand); background: #fff; }
.btn--soft { color: var(--s-brand-d); background: rgba(24,199,212,.10); border-color: rgba(24,199,212,.22); }
.btn--soft:hover { color: var(--s-brand-d); background: rgba(24,199,212,.16); }
.btn--lg { height: 50px; padding: 0 28px; font-size: 15.5px; }
.btn--block { width: 100%; }

/* ============================================================
   顶部导航
   ============================================================ */
.site-head {
  position: sticky; top: 0; z-index: 60;
  background: rgba(246,251,253,.78);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(227,238,244,.9);
}
.site-head__in {
  height: 66px; display: flex; align-items: center; gap: 22px;
}
.brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand__mark {
  width: 34px; height: 34px; border-radius: 10px; flex: 0 0 34px;
  background: var(--s-grad); display: grid; place-items: center;
  box-shadow: 0 6px 16px rgba(24,199,212,.35);
}
.brand__mark svg { width: 19px; height: 19px; }
.brand__name { font-size: 16.5px; font-weight: 700; color: var(--s-ink); letter-spacing: -.01em; }
.brand__name em { font-style: normal; color: var(--s-brand-d); }

.site-nav { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.site-nav a {
  padding: 8px 13px; border-radius: 999px;
  font-size: 14.5px; color: var(--s-ink2); font-weight: 500;
  transition: background .16s, color .16s;
}
.site-nav a:hover { color: var(--s-ink); background: rgba(255,255,255,.9); }
.site-nav a.is-active { color: var(--s-brand-d); background: rgba(24,199,212,.12); font-weight: 600; }

.site-head__right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.site-head__right .btn { height: 38px; padding: 0 16px; font-size: 14px; }

.head-user {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 5px 14px 5px 5px; border-radius: 999px;
  background: #fff; border: 1px solid var(--s-line2);
  transition: box-shadow .18s, border-color .18s;
}
.head-user:hover { border-color: var(--s-brand); box-shadow: 0 6px 16px rgba(10,44,60,.08); }
.head-user__avatar {
  width: 28px; height: 28px; border-radius: 50%; flex: 0 0 28px;
  background: var(--s-grad-2); color: #fff;
  display: grid; place-items: center; font-size: 12.5px; font-weight: 650;
}
.head-user__name { font-size: 14px; color: var(--s-ink); font-weight: 550; max-width: 96px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.nav-toggle {
  display: none; width: 40px; height: 40px; margin-left: auto;
  border: 1px solid var(--s-line2); border-radius: 12px;
  background: #fff; cursor: pointer; color: var(--s-ink);
}
.nav-toggle svg { width: 20px; height: 20px; }

/* 仅在移动端展开的登录/用户中心入口 */
.nav-mobile { display: none; flex-direction: column; gap: 8px; }
.nav-mobile__sep { height: 1px; background: var(--s-line); margin: 12px 0 4px; }
.site-nav .nav-mobile a {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 14px; border-radius: 12px; font-size: 14.5px; font-weight: 550;
  border: 1px solid var(--s-line2); color: var(--s-ink); background: #fff;
}
.site-nav .nav-mobile a.is-primary {
  background: var(--s-grad); color: #fff; border-color: transparent;
  box-shadow: 0 8px 20px rgba(24,199,212,.28);
}

/* ============================================================
   Hero
   ============================================================ */
.hero { padding: 74px 0 24px; }
.hero__in { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px 6px 8px; border-radius: 999px;
  background: rgba(255,255,255,.86); border: 1px solid var(--s-line2);
  font-size: 13px; color: var(--s-ink2); box-shadow: var(--s-sh-1);
}
.hero__badge b { color: var(--s-brand-d); font-weight: 600; }
.hero__dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--s-mint);
  box-shadow: 0 0 0 4px rgba(46,230,197,.20);
}
.hero__title { font-size: 46px; line-height: 1.16; letter-spacing: -.03em; margin: 20px 0 18px; }
.hero__lead { font-size: 16.5px; color: var(--s-ink2); line-height: 1.85; max-width: 540px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 22px; }
.hero__tags { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.hero__tags span { display: inline-flex; align-items: center; gap: 7px; font-size: 13.5px; color: var(--s-ink2); }
.hero__tags svg { width: 15px; height: 15px; color: var(--s-brand); flex: 0 0 15px; }

/* 右侧对话演示卡 */
.demo {
  position: relative;
  background: #fff; border: 1px solid var(--s-line);
  border-radius: var(--s-r-xl); box-shadow: var(--s-sh-3);
  padding: 18px 18px 50px; overflow: hidden;
}
.demo::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(34,211,238,.06), transparent 40%);
}
.demo__bar {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 14px; border-bottom: 1px solid var(--s-line);
}
.demo__ava {
  width: 36px; height: 36px; border-radius: 12px; flex: 0 0 36px;
  background: var(--s-grad); display: grid; place-items: center;
}
.demo__ava svg { width: 19px; height: 19px; }
.demo__meta b { display: block; font-size: 14px; font-weight: 650; }
.demo__meta i { font-style: normal; font-size: 12px; color: var(--s-mint); display: inline-flex; align-items: center; gap: 5px; }
.demo__meta i::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--s-mint); }
.demo__live {
  margin-left: auto; font-size: 11.5px; color: var(--s-brand-d);
  background: rgba(24,199,212,.10); border: 1px solid rgba(24,199,212,.22);
  padding: 3px 10px; border-radius: 999px; font-weight: 600;
}
.demo__body { display: flex; flex-direction: column; gap: 12px; padding: 16px 2px 4px; }
.bubble { max-width: 82%; padding: 11px 14px; border-radius: 16px; font-size: 14px; line-height: 1.65; }
.bubble--user {
  align-self: flex-end; color: #fff;
  background: linear-gradient(118deg, #1fc9d6, #3aa8f5);
  border-bottom-right-radius: 5px;
}
.bubble--ai {
  align-self: flex-start; background: var(--s-surface-2);
  border: 1px solid var(--s-line); border-bottom-left-radius: 5px; color: var(--s-ink);
}
.bubble--typing { display: inline-flex; align-items: center; gap: 5px; padding: 13px 16px; }
.bubble--typing i {
  width: 6px; height: 6px; border-radius: 50%; background: var(--s-ink3);
  animation: sBlink 1.3s infinite;
}
.bubble--typing i:nth-child(2) { animation-delay: .18s; }
.bubble--typing i:nth-child(3) { animation-delay: .36s; }
@keyframes sBlink { 0%,60%,100% { opacity: .28; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }

.demo__wave {
  display: flex; align-items: center; gap: 3px; height: 30px;
  margin: 8px 2px 0; padding: 0 2px;
}
.demo__wave i {
  flex: 1 1 auto; width: 3px; border-radius: 3px; background: var(--s-grad-2);
  animation: sWave 1.1s ease-in-out infinite;
}
@keyframes sWave { 0%,100% { height: 16%; opacity: .55; } 50% { height: 100%; opacity: 1; } }

.demo__chips { display: flex; gap: 8px; flex-wrap: wrap; padding: 14px 2px 2px; }
.chip {
  font-size: 12.5px; padding: 5px 12px; border-radius: 999px;
  background: rgba(255,255,255,.9); border: 1px solid var(--s-line2); color: var(--s-ink2);
}
.chip--hot { color: var(--s-brand-d); background: rgba(24,199,212,.10); border-color: rgba(24,199,212,.24); font-weight: 600; }

.demo__float {
  position: absolute; right: 20px; bottom: 13px;
  background: rgba(255,255,255,.94); border: 1px solid var(--s-line2); border-radius: 12px;
  box-shadow: var(--s-sh-1); padding: 8px 14px; font-size: 12.5px; color: var(--s-ink2);
  display: flex; align-items: center; gap: 8px;
}
.demo__float b { font-family: var(--s-mono); color: var(--s-brand-d); font-size: 14px; }

/* ============================================================
   通用区块
   ============================================================ */
.section { padding: 62px 0; }
.section--tight { padding: 40px 0; }
.section__head { max-width: 720px; margin-bottom: 34px; }
.section__head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section__head .h2 { margin: 14px 0 12px; }
.section__head .lead { margin: 0; }

.grid { display: grid; gap: 18px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0,1fr)); }

.card {
  background: var(--s-surface); border: 1px solid var(--s-line);
  border-radius: var(--s-r-lg); padding: 24px;
  box-shadow: var(--s-sh-1);
  transition: transform .2s ease, box-shadow .22s ease, border-color .22s ease;
  height: 100%;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--s-sh-3); border-color: rgba(34,211,238,.45); }
.card__ico {
  width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center;
  background: var(--s-grad-soft); border: 1px solid rgba(34,211,238,.18);
  color: var(--s-brand-d); margin-bottom: 16px;
}
.card__ico svg { width: 21px; height: 21px; }
.card h3 { font-size: 16.5px; margin-bottom: 8px; }
.card p { color: var(--s-ink2); font-size: 14.2px; margin: 0; }
.card ul.dots { margin-top: 12px; display: flex; flex-direction: column; gap: 7px; }
.dots li { position: relative; padding-left: 17px; font-size: 13.8px; color: var(--s-ink2); }
.dots li::before {
  content: ""; position: absolute; left: 3px; top: 9px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--s-cyan);
}

/* 特性长条 */
.frow {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  padding: 30px 0;
}
.frow + .frow { border-top: 1px dashed var(--s-line2); }
.frow__label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 650; letter-spacing: .04em;
  color: var(--s-brand-d); background: rgba(24,199,212,.10);
  border: 1px solid rgba(24,199,212,.22); padding: 4px 12px; border-radius: 999px;
  margin-bottom: 14px;
}
.frow h3 { font-size: 24px; margin-bottom: 12px; letter-spacing: -.02em; }
.frow p { color: var(--s-ink2); }
.frow .dots { margin-top: 14px; gap: 9px; }
.frow .dots li { font-size: 14.2px; }

.panel {
  background: var(--s-surface); border: 1px solid var(--s-line);
  border-radius: var(--s-r-lg); box-shadow: var(--s-sh-2); padding: 22px;
}
.panel--grad { background: linear-gradient(160deg, #fff, #f2fbfd 60%, #f3f2ff); }

/* 代码块 */
.code {
  background: #0c1d26; color: #cfe9f2; border-radius: var(--s-r);
  padding: 16px 18px; font-family: var(--s-mono); font-size: 12.8px; line-height: 1.8;
  overflow-x: auto; margin: 0;
}
.code .k { color: #7dd3fc; }
.code .s { color: #86efac; }
.code .c { color: #64818f; }

/* 流程 */
.flow { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 12px; }
.flow__item {
  position: relative; text-align: center; padding: 22px 14px;
  background: #fff; border: 1px solid var(--s-line); border-radius: var(--s-r-lg);
  box-shadow: var(--s-sh-1);
}
.flow__item:not(:last-child)::after {
  content: ""; position: absolute; right: -9px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 2px; background: var(--s-line2); border-radius: 2px;
}
.flow__n {
  width: 34px; height: 34px; margin: 0 auto 12px; border-radius: 11px;
  background: var(--s-grad); color: #fff; font-weight: 700; font-size: 14px;
  display: grid; place-items: center; box-shadow: 0 6px 14px rgba(24,199,212,.30);
}
.flow__item b { display: block; font-size: 14.5px; margin-bottom: 5px; }
.flow__item span { font-size: 12.8px; color: var(--s-ink2); line-height: 1.6; display: block; }

/* 数据条 */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; }
.stat {
  background: #fff; border: 1px solid var(--s-line); border-radius: var(--s-r-lg);
  padding: 22px; text-align: center; box-shadow: var(--s-sh-1);
}
.stat b { display: block; font-size: 30px; letter-spacing: -.02em; line-height: 1.2;
  background: var(--s-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat span { font-size: 13.2px; color: var(--s-ink2); }

/* 步骤 */
.steps { display: flex; flex-direction: column; gap: 0; counter-reset: st; }
.step {
  position: relative; padding: 0 0 30px 62px; counter-increment: st;
}
.step::before {
  content: counter(st, decimal-leading-zero);
  position: absolute; left: 0; top: 0;
  width: 42px; height: 42px; border-radius: 14px;
  background: #fff; border: 1px solid var(--s-line2); color: var(--s-brand-d);
  display: grid; place-items: center; font-size: 13px; font-weight: 700; font-family: var(--s-mono);
  box-shadow: var(--s-sh-1);
}
.step:not(:last-child)::after {
  content: ""; position: absolute; left: 21px; top: 48px; bottom: 6px;
  width: 1px; background: linear-gradient(180deg, var(--s-line2), transparent);
}
.step h3 { font-size: 17px; margin-bottom: 7px; }
.step p { color: var(--s-ink2); font-size: 14.3px; margin-bottom: 8px; }
.step .code { margin-top: 10px; }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 10px; }
.faq details {
  background: #fff; border: 1px solid var(--s-line); border-radius: var(--s-r);
  box-shadow: var(--s-sh-1); overflow: hidden;
  transition: border-color .2s ease;
}
.faq details[open] { border-color: rgba(34,211,238,.45); }
.faq summary {
  cursor: pointer; list-style: none; padding: 15px 50px 15px 20px;
  font-size: 15px; font-weight: 550; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 20px; top: 50%;
  width: 9px; height: 9px; margin-top: -6px;
  border-right: 2px solid var(--s-ink3); border-bottom: 2px solid var(--s-ink3);
  transform: rotate(45deg); transition: transform .22s ease;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; border-color: var(--s-brand); }
.faq .faq__body { padding: 0 20px 18px; color: var(--s-ink2); font-size: 14.3px; }
.faq .faq__body p:last-child { margin-bottom: 0; }

/* 信任条 */
.trust { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; }
.trust__i {
  display: flex; align-items: center; gap: 11px; padding: 15px 18px;
  background: rgba(255,255,255,.86); border: 1px solid var(--s-line);
  border-radius: var(--s-r); font-size: 14px; color: var(--s-ink);
}
.trust__i svg { width: 19px; height: 19px; color: var(--s-brand); flex: 0 0 19px; }

/* 检查清单 */
.checklist { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px 22px; }
.checklist li { display: flex; gap: 10px; align-items: flex-start; font-size: 14.4px; color: var(--s-ink2); }
.checklist svg { width: 18px; height: 18px; color: var(--s-mint); flex: 0 0 18px; margin-top: 3px; }

/* CTA 条 */
.cta {
  position: relative; overflow: hidden;
  background: var(--s-grad); border-radius: var(--s-r-xl);
  padding: 46px 44px; color: #fff; box-shadow: 0 24px 60px rgba(58,168,245,.26);
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(500px 260px at 88% -20%, rgba(255,255,255,.34), transparent 65%);
}
.cta__in { position: relative; display: flex; align-items: center; gap: 34px; flex-wrap: wrap; }
.cta h2 { font-size: 27px; color: #fff; margin-bottom: 8px; }
.cta p { color: rgba(255,255,255,.9); margin: 0; font-size: 15px; }
.cta__btns { margin-left: auto; display: flex; gap: 12px; flex-wrap: wrap; }
.cta .btn--primary { background: #fff; color: var(--s-brand-d); box-shadow: 0 10px 24px rgba(4,30,45,.18); }
.cta .btn--primary:hover { color: var(--s-brand-d); }
.cta .btn--ghost { background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.45); color: #fff; }
.cta .btn--ghost:hover { background: rgba(255,255,255,.26); color: #fff; border-color: #fff; }

/* 表格 */
.tbl { width: 100%; border-collapse: collapse; font-size: 14.2px; background: #fff;
  border: 1px solid var(--s-line); border-radius: var(--s-r); overflow: hidden; }
.tbl th, .tbl td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--s-line); vertical-align: top; }
.tbl th { background: var(--s-surface-2); font-weight: 620; font-size: 13.6px; color: var(--s-ink2); white-space: nowrap; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl td b { font-weight: 600; }

/* 页面头（内页） */
.phead { padding: 56px 0 8px; text-align: center; }
.phead .h2 { font-size: 38px; margin: 14px 0 14px; letter-spacing: -.03em; }
.phead .lead { max-width: 660px; margin: 0 auto; }
.crumb { font-size: 13px; color: var(--s-ink3); }
.crumb a { color: var(--s-ink3); }
.crumb a:hover { color: var(--s-brand-d); }

/* 用户中心 */
.uc { display: grid; grid-template-columns: 300px 1fr; gap: 22px; align-items: start; }
.uc__side { position: sticky; top: 86px; }
.uc__card {
  background: #fff; border: 1px solid var(--s-line); border-radius: var(--s-r-lg);
  box-shadow: var(--s-sh-2); padding: 26px 22px; text-align: center;
}
.uc__avatar {
  width: 66px; height: 66px; margin: 0 auto 14px; border-radius: 22px;
  background: var(--s-grad); color: #fff; display: grid; place-items: center;
  font-size: 26px; font-weight: 700; box-shadow: 0 12px 26px rgba(24,199,212,.32);
}
.uc__name { font-size: 18px; font-weight: 650; }
.uc__sub { font-size: 13px; color: var(--s-ink3); margin-bottom: 16px; }
.uc__badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px;
  padding: 4px 12px; border-radius: 999px; font-weight: 600;
  background: rgba(46,230,197,.14); color: #0d9488; border: 1px solid rgba(46,230,197,.3);
}
.uc__links { display: flex; flex-direction: column; gap: 8px; margin-top: 18px; }
.uc__links a {
  display: flex; align-items: center; gap: 9px; justify-content: center;
  height: 40px; border-radius: 12px; border: 1px solid var(--s-line2);
  font-size: 14px; color: var(--s-ink); background: #fff;
}
.uc__links a:hover { border-color: var(--s-brand); color: var(--s-brand-d); background: rgba(24,199,212,.06); }
.uc__links a.primary {
  background: var(--s-grad); color: #fff; border-color: transparent;
  box-shadow: 0 8px 20px rgba(24,199,212,.28);
}
.uc__links a.primary:hover { color: #fff; }

.uc__mail { font-size: 13.5px; color: var(--s-ink2); word-break: break-all; }
.uc__stat { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; margin-bottom: 20px; }
.uc__tile {
  background: #fff; border: 1px solid var(--s-line); border-radius: var(--s-r);
  padding: 16px 18px; box-shadow: var(--s-sh-1);
  display: flex; align-items: center; gap: 12px;
  transition: transform .18s, box-shadow .2s, border-color .2s;
}
.uc__tile:hover { transform: translateY(-2px); box-shadow: var(--s-sh-2); border-color: rgba(34,211,238,.45); }
.uc__tile svg { width: 20px; height: 20px; color: var(--s-brand-d); flex: 0 0 20px; }
.uc__tile b { display: block; font-size: 19px; line-height: 1.2; }
.uc__tile span { font-size: 12.6px; color: var(--s-ink3); }

.list-card { background: #fff; border: 1px solid var(--s-line); border-radius: var(--s-r-lg); box-shadow: var(--s-sh-1); overflow: hidden; }
.list-card__head { display: flex; align-items: center; gap: 10px; padding: 16px 20px; border-bottom: 1px solid var(--s-line); }
.list-card__head b { font-size: 15.5px; }
.list-card__head a { margin-left: auto; font-size: 13.5px; }
.lrow { display: flex; align-items: center; gap: 12px; padding: 14px 20px; border-bottom: 1px solid var(--s-line); }
.lrow:last-child { border-bottom: 0; }
.lrow:hover { background: var(--s-surface-2); }
.lrow__ico { width: 34px; height: 34px; border-radius: 11px; flex: 0 0 34px; display: grid; place-items: center;
  background: var(--s-grad-soft); color: var(--s-brand-d); }
.lrow__ico svg { width: 17px; height: 17px; }
.lrow__t { flex: 1; min-width: 0; }
.lrow__t b { display: block; font-size: 14.2px; font-weight: 550; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lrow__t span { font-size: 12.5px; color: var(--s-ink3); }
.lrow__time { font-size: 12.5px; color: var(--s-ink3); white-space: nowrap; }
.empty { padding: 40px 20px; text-align: center; color: var(--s-ink3); font-size: 14px; }

/* ============================================================
   页脚
   ============================================================ */
.site-foot {
  margin-top: 70px; border-top: 1px solid var(--s-line);
  background: rgba(255,255,255,.7); position: relative; z-index: 1;
}
.site-foot__in { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 34px; padding: 48px 0 30px; }
.site-foot__desc { font-size: 13.8px; color: var(--s-ink2); max-width: 320px; margin-top: 14px; }
.site-foot h4 { font-size: 13.5px; color: var(--s-ink); margin-bottom: 13px; letter-spacing: .02em; }
.site-foot ul { display: flex; flex-direction: column; gap: 9px; }
.site-foot ul a { font-size: 13.8px; color: var(--s-ink2); }
.site-foot ul a:hover { color: var(--s-brand-d); }
.site-foot__bottom {
  border-top: 1px solid var(--s-line); padding: 18px 0 34px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 12.8px; color: var(--s-ink3);
}
.site-foot__bottom span:last-child { margin-left: auto; }

/* 飘浮快捷键 */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 50;
  width: 42px; height: 42px; border-radius: 50%;
  background: #fff; border: 1px solid var(--s-line2); color: var(--s-ink2);
  display: grid; place-items: center; cursor: pointer;
  box-shadow: var(--s-sh-2); opacity: 0; visibility: hidden;
  transition: opacity .25s, visibility .25s, transform .2s;
}
.to-top.is-show { opacity: 1; visibility: visible; }
.to-top:hover { transform: translateY(-3px); color: var(--s-brand-d); border-color: var(--s-brand); }
.to-top svg { width: 18px; height: 18px; }

/* 滚动渐入 */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .demo__wave i, .bubble--typing i { animation: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero__in { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding-top: 52px; }
  .hero__title { font-size: 38px; }
  .grid--4, .stats, .trust, .uc__stat { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .flow { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .flow__item:nth-child(3)::after { display: none; }
  .frow { grid-template-columns: 1fr; gap: 24px; }
  .uc { grid-template-columns: 1fr; }
  .uc__side { position: static; }
  .site-foot__in { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .site-nav {
    position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px; margin: 0;
    background: rgba(255,255,255,.98); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--s-line); padding: 12px 18px 18px;
    box-shadow: var(--s-sh-2);
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 11px 12px; border-radius: 10px; }
  .nav-toggle { display: grid; place-items: center; }
  .site-head__right { margin-left: 0; }
  .site-head__right .btn--ghost { display: none; }
  .head-user__name { display: none; }
  .nav-mobile { display: flex; }

  .section { padding: 46px 0; }
  .h2 { font-size: 26px; }
  .phead .h2 { font-size: 29px; }
  .hero__title { font-size: 31px; }
  .grid--3, .grid--4, .stats, .trust, .checklist, .uc__stat { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .flow__item::after { display: none; }
  .cta { padding: 32px 24px; }
  .cta__btns { margin-left: 0; width: 100%; }
  .site-foot__in { grid-template-columns: 1fr; gap: 26px; padding-bottom: 18px; }
  .tbl { display: block; overflow-x: auto; }
  .demo__float { position: static; margin-top: 14px; }
  .demo { padding-bottom: 18px; }
}