/* =========================================================
   灵犀AI LingXi AI — 全站样式
   ========================================================= */

/* ---------- 变量与主题 ---------- */
:root {
  --primary: #5b6cff;
  --primary-2: #9b5cff;
  --accent: #22d3a8;
  --grad: linear-gradient(135deg, #5b6cff 0%, #9b5cff 100%);
  --grad-soft: linear-gradient(135deg, rgba(91,108,255,.12) 0%, rgba(155,92,255,.12) 100%);
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-2: #eef1f9;
  --border: #e4e8f3;
  --text: #1a2033;
  --muted: #5a6478;
  --shadow: 0 10px 40px rgba(26,32,51,.08);
  --shadow-sm: 0 4px 16px rgba(26,32,51,.06);
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 68px;
  --max-w: 1180px;
}
[data-theme="dark"] {
  --bg: #0d1020;
  --surface: #151a2e;
  --surface-2: #1b2138;
  --border: #2a3150;
  --text: #e8ecf8;
  --muted: #9aa4c0;
  --shadow: 0 10px 40px rgba(0,0,0,.45);
  --shadow-sm: 0 4px 16px rgba(0,0,0,.35);
  --grad-soft: linear-gradient(135deg, rgba(91,108,255,.18) 0%, rgba(155,92,255,.18) 100%);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  transition: background .3s, color .3s;
}
a { color: inherit; text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary); }
img { max-width: 100%; display: block; }
ul, ol { padding-left: 1.4em; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; letter-spacing: .01em; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
section { padding: 72px 0; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-head h2 { font-size: 32px; margin-bottom: 12px; }
.section-head p { color: var(--muted); font-size: 17px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary);
  background: var(--grad-soft); border-radius: 999px; padding: 4px 14px; margin-bottom: 14px;
  letter-spacing: .06em;
}
.text-center { text-align: center; }

/* ---------- 按钮 / 徽章 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 12px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: all .2s; white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 6px 20px rgba(91,108,255,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(91,108,255,.45); color: #fff; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-light { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-light:hover { border-color: var(--primary); color: var(--primary); }
.btn.sm { padding: 8px 18px; font-size: 14px; border-radius: 10px; }
.btn.lg { padding: 15px 34px; font-size: 17px; }
.badge {
  display: inline-block; padding: 3px 10px; font-size: 12px; border-radius: 999px;
  background: var(--grad-soft); color: var(--primary); font-weight: 600;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 32px; height: 100%; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; }
.brand-logo {
  width: 34px; height: 34px; border-radius: 10px; background: var(--grad);
  display: grid; place-items: center; color: #fff; font-size: 18px;
  box-shadow: 0 4px 12px rgba(91,108,255,.4);
}
.brand-name em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.main-nav { display: flex; gap: 28px; flex: 1; }
.main-nav a { font-size: 15px; font-weight: 500; color: var(--muted); padding: 6px 2px; position: relative; }
.main-nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--grad); border-radius: 2px; transition: right .25s;
}
.main-nav a:hover, .main-nav a.active { color: var(--text); }
.main-nav a.active::after { right: 0; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle, .nav-toggle {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); cursor: pointer; font-size: 16px; color: var(--text);
  display: grid; place-items: center; transition: all .2s;
}
.theme-toggle:hover, .nav-toggle:hover { border-color: var(--primary); }
.nav-toggle { display: none; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 80px; position: relative; overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; position: relative; z-index: 2; }
.hero h1 { font-size: 48px; line-height: 1.22; margin: 18px 0 20px; }
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-sub { font-size: 18px; color: var(--muted); margin-bottom: 32px; max-width: 480px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .35; z-index: 1; pointer-events: none; }
.orb-1 { width: 420px; height: 420px; background: #5b6cff; top: -120px; right: -80px; }
.orb-2 { width: 320px; height: 320px; background: #9b5cff; bottom: -140px; left: -100px; }
[data-theme="dark"] .orb { opacity: .22; }

.hero-stats { display: flex; gap: 48px; margin-top: 44px; flex-wrap: wrap; }
.hero-stat b { display: block; font-size: 26px; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-stat span { font-size: 13px; color: var(--muted); }

/* Hero 右侧：聊天窗口 mock */
.chat-mock {
  background: var(--surface); border: 1px solid var(--border); border-radius: 20px;
  box-shadow: var(--shadow); overflow: hidden;
}
.chat-mock-bar {
  display: flex; align-items: center; gap: 8px; padding: 12px 16px;
  border-bottom: 1px solid var(--border); background: var(--surface-2);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-r { background: #ff5f57; } .dot-y { background: #febc2e; } .dot-g { background: #28c840; }
.chat-mock-title { margin-left: 10px; font-size: 13px; color: var(--muted); }
.chat-mock-body { padding: 20px; display: flex; flex-direction: column; gap: 14px; min-height: 300px; }
.mock-msg { max-width: 85%; padding: 12px 16px; border-radius: 14px; font-size: 14px; }
.mock-user { align-self: flex-end; background: var(--grad); color: #fff; border-bottom-right-radius: 4px; }
.mock-ai { align-self: flex-start; background: var(--surface-2); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.mock-ai .typing { display: inline-flex; gap: 5px; align-items: center; height: 18px; }
.mock-ai .typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite; }
.mock-ai .typing i:nth-child(2) { animation-delay: .2s; }
.mock-ai .typing i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 60%, 100% { opacity: .25; } 30% { opacity: 1; } }

/* ---------- 特性卡片 ---------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow-sm); transition: all .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.card .icon {
  width: 48px; height: 48px; border-radius: 12px; background: var(--grad-soft);
  display: grid; place-items: center; font-size: 22px; margin-bottom: 18px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
.step { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 26px 26px; box-shadow: var(--shadow-sm); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  position: absolute; top: -18px; left: 26px; font-size: 15px; font-weight: 800;
  background: var(--grad); color: #fff; border-radius: 10px; padding: 4px 12px;
  box-shadow: 0 4px 12px rgba(91,108,255,.35);
}
.step h3 { font-size: 17px; margin: 8px 0 8px; }
.step p { color: var(--muted); font-size: 15px; }

/* ---------- 定价 ---------- */
.billing-toggle {
  display: inline-flex; align-items: center; background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; padding: 5px; gap: 4px; margin: 0 auto 44px;
}
.billing-toggle button {
  border: 0; background: transparent; padding: 9px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600; color: var(--muted); cursor: pointer; transition: all .2s;
}
.billing-toggle button.active { background: var(--grad); color: #fff; }
.billing-toggle .save-tag { font-size: 12px; margin-left: 4px; }
.toggle-wrap { text-align: center; }

.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; align-items: stretch; }
.price-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; display: flex; flex-direction: column; position: relative; transition: all .25s;
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.price-card.featured { border: 2px solid var(--primary); box-shadow: 0 12px 40px rgba(91,108,255,.18); }
.price-card .flag {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #fff; font-size: 12px; font-weight: 700;
  padding: 4px 16px; border-radius: 999px; white-space: nowrap;
}
.price-card h3 { font-size: 19px; }
.price-card .for { font-size: 13px; color: var(--muted); margin: 4px 0 18px; }
.price-line { display: flex; align-items: baseline; gap: 4px; }
.price-line .cur { font-size: 16px; font-weight: 700; }
.price-line .num { font-size: 40px; font-weight: 800; letter-spacing: -.02em; }
.price-line .period { color: var(--muted); font-size: 14px; }
.price-note { font-size: 12px; color: var(--muted); min-height: 18px; margin-top: 2px; }
.price-card ul { list-style: none; padding: 0; margin: 20px 0; flex: 1; }
.price-card li { padding: 7px 0; font-size: 14px; color: var(--muted); display: flex; gap: 10px; align-items: flex-start; }
.price-card li::before { content: "✓"; color: var(--accent); font-weight: 800; }
.price-card li.off { opacity: .45; }
.price-card li.off::before { content: "–"; color: var(--muted); }
.price-card .btn { width: 100%; }

.compare-table-wrap { overflow-x: auto; margin-top: 64px; }
.compare-table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; min-width: 720px; box-shadow: var(--shadow-sm); }
.compare-table th, .compare-table td { padding: 14px 18px; text-align: center; border-bottom: 1px solid var(--border); font-size: 14px; }
.compare-table th { background: var(--surface-2); font-weight: 700; font-size: 14px; }
.compare-table td:first-child { text-align: left; color: var(--muted); width: 220px; }
.compare-table tr:last-child td { border-bottom: 0; }
.compare-table .yes { color: var(--accent); font-weight: 700; }
.compare-table .no { color: var(--muted); opacity: .5; }

/* ---------- 评价 ---------- */
.quote-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-sm); }
.quote-card p { font-size: 15px; margin: 14px 0 18px; color: var(--muted); }
.quote-user { display: flex; align-items: center; gap: 12px; }
.avatar { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; background: var(--grad); }
.quote-user b { font-size: 14px; display: block; }
.quote-user span { font-size: 12px; color: var(--muted); }
.stars { color: #f5a623; letter-spacing: 2px; font-size: 14px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 780px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 18px 22px; font-weight: 600; font-size: 15.5px;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 20px; color: var(--primary); font-weight: 700; transition: transform .2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-body { padding: 0 22px 18px; color: var(--muted); font-size: 15px; }

/* ---------- CTA 横幅 ---------- */
.cta-banner {
  background: var(--grad); border-radius: 24px; padding: 56px 40px; text-align: center;
  color: #fff; position: relative; overflow: hidden;
}
.cta-banner h2 { font-size: 30px; margin-bottom: 12px; }
.cta-banner p { opacity: .9; margin-bottom: 26px; font-size: 16px; }
.cta-banner .btn-light { background: #fff; color: var(--primary); border: 0; }
.cta-banner .btn-light:hover { transform: translateY(-2px); color: var(--primary); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); padding: 56px 0 0; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand p { color: var(--muted); font-size: 14px; margin-top: 14px; max-width: 320px; }
.footer-col h4 { font-size: 14px; margin-bottom: 14px; }
.footer-col a { display: block; color: var(--muted); font-size: 14px; padding: 5px 0; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding: 18px 24px; font-size: 13px; color: var(--muted); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- 表单页（登录/注册/联系） ---------- */
.form-shell { min-height: calc(100vh - var(--header-h) - 240px); display: grid; place-items: center; padding: 64px 0; }
.form-card {
  width: 100%; max-width: 420px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 20px; padding: 36px 32px; box-shadow: var(--shadow);
}
.form-card.wide { max-width: 560px; }
.form-card h2 { font-size: 24px; text-align: center; margin-bottom: 6px; }
.form-card .form-sub { text-align: center; color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 7px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 15px; outline: none; transition: border .2s;
  font-family: inherit;
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--primary); }
.field textarea { resize: vertical; min-height: 110px; }
.field .err { color: #e5484d; font-size: 12.5px; margin-top: 5px; display: none; }
.field.invalid input, .field.invalid textarea { border-color: #e5484d; }
.field.invalid .err { display: block; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.check-row { display: flex; align-items: flex-start; gap: 8px; font-size: 13.5px; color: var(--muted); margin: 6px 0 18px; }
.check-row a { color: var(--primary); }
.check-row input { margin-top: 4px; }
.form-alt { text-align: center; font-size: 14px; color: var(--muted); margin-top: 20px; }
.form-alt a { color: var(--primary); font-weight: 600; }
.divider { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 12.5px; margin: 20px 0; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.social-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.alert-ok {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border));
  color: color-mix(in srgb, var(--accent) 70%, var(--text));
  padding: 11px 16px; border-radius: 10px; font-size: 14px; margin-bottom: 16px; display: none;
}
.alert-ok.show { display: block; }

/* ---------- 法务文档页 ---------- */
.doc-page { max-width: 820px; margin: 0 auto; }
.doc-head { padding: 64px 0 8px; }
.doc-head h1 { font-size: 34px; margin-bottom: 10px; }
.doc-head .meta { color: var(--muted); font-size: 14px; }
.doc-body { padding: 28px 0 72px; }
.doc-body h2 { font-size: 21px; margin: 36px 0 14px; padding-left: 12px; border-left: 4px solid var(--primary); }
.doc-body h3 { font-size: 17px; margin: 24px 0 10px; }
.doc-body p, .doc-body li { color: var(--muted); font-size: 15.5px; margin-bottom: 10px; }
.doc-body strong { color: var(--text); }
.doc-toc {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px 22px; margin: 20px 0 8px; font-size: 14.5px;
}
.doc-toc a { display: inline-block; margin: 4px 14px 4px 0; color: var(--primary); }

/* ---------- 关于页 ---------- */
.about-hero { text-align: center; padding: 84px 0 40px; }
.about-hero h1 { font-size: 40px; margin-bottom: 14px; }
.about-hero p { color: var(--muted); font-size: 17px; max-width: 640px; margin: 0 auto; }
.value-card { text-align: left; }
.timeline { max-width: 720px; margin: 0 auto; position: relative; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--border); }
.tl-item { position: relative; padding: 0 0 28px 12px; }
.tl-item::before {
  content: ""; position: absolute; left: -28px; top: 7px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--grad); box-shadow: 0 0 0 4px var(--grad-soft);
}
.tl-item b { font-size: 15px; }
.tl-item p { color: var(--muted); font-size: 14.5px; margin-top: 4px; }

/* ---------- AI 控制台 ---------- */
.console-wrap { display: grid; grid-template-columns: 260px 1fr; height: calc(100vh - var(--header-h)); }
.console-side { background: var(--surface); border-right: 1px solid var(--border); padding: 20px 14px; display: flex; flex-direction: column; gap: 14px; }
.new-chat-btn { width: 100%; justify-content: center; }
.side-label { font-size: 12px; color: var(--muted); padding: 6px 8px 0; letter-spacing: .05em; }
.history-list { display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }
.history-item {
  padding: 10px 12px; border-radius: 10px; font-size: 13.5px; color: var(--muted);
  cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: all .15s;
}
.history-item:hover, .history-item.active { background: var(--surface-2); color: var(--text); }
.side-foot { margin-top: auto; border-top: 1px solid var(--border); padding-top: 14px; font-size: 12.5px; color: var(--muted); }
.side-foot .quota-bar { height: 7px; border-radius: 999px; background: var(--surface-2); overflow: hidden; margin: 8px 0 6px; }
.side-foot .quota-bar i { display: block; height: 100%; width: 62%; background: var(--grad); border-radius: 999px; }

.console-main { display: flex; flex-direction: column; min-width: 0; }
.console-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 24px; border-bottom: 1px solid var(--border); background: var(--surface);
}
.console-head .model-select { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); }
.console-head select {
  padding: 7px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 14px; outline: none;
}
.demo-tag { font-size: 12px; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); padding: 4px 12px; border-radius: 999px; }

.msgs { flex: 1; overflow-y: auto; padding: 28px 24px; display: flex; flex-direction: column; gap: 18px; }
.msg { display: flex; gap: 12px; max-width: 860px; }
.msg .msg-avatar {
  width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0; display: grid; place-items: center;
  font-size: 15px; font-weight: 800; color: #fff; background: var(--grad);
}
.msg.ai .msg-avatar { background: var(--surface-2); border: 1px solid var(--border); color: var(--primary); }
.msg-bubble { padding: 13px 18px; border-radius: 16px; font-size: 15px; white-space: pre-wrap; word-break: break-word; }
.msg.user { align-self: flex-end; flex-direction: row-reverse; }
.msg.user .msg-avatar { background: var(--primary); }
.msg.user .msg-bubble { background: var(--grad); color: #fff; border-bottom-right-radius: 5px; }
.msg.ai .msg-bubble { background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 5px; box-shadow: var(--shadow-sm); }
.msg-bubble pre {
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; overflow-x: auto; font-size: 13px; margin: 10px 0; font-family: Consolas, Monaco, monospace;
}
.msg-bubble code { font-family: Consolas, Monaco, monospace; font-size: .92em; }
.msg-bubble strong { font-weight: 700; }
.typing-dots { display: inline-flex; gap: 5px; }
.typing-dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite; }
.typing-dots i:nth-child(2) { animation-delay: .2s; }
.typing-dots i:nth-child(3) { animation-delay: .4s; }

.chips { display: flex; gap: 10px; flex-wrap: wrap; padding: 0 24px 14px; }
.chip {
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  border-radius: 999px; padding: 7px 16px; font-size: 13.5px; cursor: pointer; transition: all .2s;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }

.composer { padding: 0 24px 22px; }
.composer-box {
  display: flex; align-items: flex-end; gap: 10px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 18px; padding: 12px 14px; box-shadow: var(--shadow-sm);
  transition: border .2s;
}
.composer-box:focus-within { border-color: var(--primary); }
.composer-box textarea {
  flex: 1; border: 0; outline: none; background: transparent; color: var(--text);
  font-size: 15px; resize: none; max-height: 160px; min-height: 24px; line-height: 1.6; font-family: inherit;
}
.send-btn {
  width: 40px; height: 40px; border-radius: 12px; border: 0; background: var(--grad); color: #fff;
  font-size: 17px; cursor: pointer; display: grid; place-items: center; transition: all .2s; flex-shrink: 0;
}
.send-btn:disabled { opacity: .45; cursor: not-allowed; }
.send-btn:not(:disabled):hover { transform: scale(1.06); }
.composer-hint { text-align: center; font-size: 12px; color: var(--muted); margin-top: 10px; }

/* ---------- 通用动效 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero h1 { font-size: 38px; }
  .chat-mock { max-width: 560px; }
}
@media (max-width: 760px) {
  section { padding: 52px 0; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; background: var(--surface);
    border-bottom: 1px solid var(--border); flex-direction: column; gap: 0; padding: 10px 24px 18px;
    display: none; box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 13px 4px; border-bottom: 1px solid var(--border); }
  .main-nav a::after { display: none; }
  .nav-toggle { display: grid; }
  .header-actions .btn.ghost-link { display: none; }
  .grid-3, .grid-2, .steps { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0; }
  .hero h1 { font-size: 32px; }
  .hero-stats { gap: 28px; }
  .form-row { grid-template-columns: 1fr; }
  .console-wrap { grid-template-columns: 1fr; }
  .console-side { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-banner { padding: 40px 24px; }
  .compare-table td:first-child { width: 140px; }
}

/* ---------- Logged-in user chip (header auth zone) ---------- */
.header-auth { display: flex; align-items: center; gap: 12px; }
.user-chip { position: relative; }
.user-btn {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 5px 12px 5px 5px; cursor: pointer;
  color: var(--text); font-size: 14px; font-weight: 600; transition: border .2s;
  font-family: inherit; max-width: 200px;
}
.user-btn:hover { border-color: var(--primary); }
.user-avatar {
  width: 28px; height: 28px; border-radius: 50%; background: var(--grad);
  color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 800;
  flex-shrink: 0;
}
.user-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-btn .caret { font-size: 11px; color: var(--muted); }
.user-menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 180px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow); padding: 6px; display: none; z-index: 300;
}
.user-menu.open { display: block; }
.user-menu a, .user-menu button {
  display: block; width: 100%; text-align: left; padding: 9px 12px;
  border: 0; background: none; border-radius: 8px; font-size: 14px;
  color: var(--text); cursor: pointer; font-family: inherit; text-decoration: none;
}
.user-menu a:hover, .user-menu button:hover { background: var(--surface-2); color: var(--text); }
.user-menu button { color: #e5484d; }
.user-menu button:hover { color: #e5484d; background: color-mix(in srgb, #e5484d 8%, var(--surface-2)); }
.user-menu .menu-divider { height: 1px; background: var(--border); margin: 4px 0; }
@media (max-width: 480px) {
  .user-name { display: none; }
  .user-btn { padding: 5px; gap: 4px; }
  .user-btn .caret { display: none; }
}

/* ---------- PayPal demo checkout (checkout.html) ---------- */
.pp-body { background: #f5f7fa; color: #111827; }
.pp-notice { background: #003087; color: #fff; font-size: 12.5px; text-align: center; padding: 8px 16px; }
.pp-header {
  background: #fff; border-bottom: 1px solid #e5e7eb; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
.pp-logo { font-size: 26px; font-weight: 800; font-style: italic; color: #003087; letter-spacing: -.02em; }
.pp-logo span { color: #009cde; }
.pp-secure { font-size: 12.5px; color: #6b7280; display: flex; align-items: center; gap: 6px; }
.pp-shell { max-width: 1000px; margin: 40px auto; padding: 0 24px; display: grid; grid-template-columns: 380px 1fr; gap: 28px; align-items: start; }
.pp-panel {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 12px; padding: 26px;
  box-shadow: 0 2px 10px rgba(0,0,0,.06);
}
.pp-merchant { display: flex; align-items: center; gap: 10px; margin: 18px 0 14px; }
.pp-merchant .pp-m-logo {
  width: 38px; height: 38px; border-radius: 10px; background: linear-gradient(135deg, #5b6cff, #9b5cff);
  display: grid; place-items: center; color: #fff; font-weight: 800;
}
.pp-merchant b { font-size: 15px; color: #111827; }
.pp-item-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  padding: 12px 0; border-bottom: 1px solid #eef0f4; font-size: 14px; color: #374151;
}
.pp-item-row b { color: #111827; font-weight: 600; }
.pp-total-row { display: flex; justify-content: space-between; padding: 14px 0 4px; font-size: 15px; font-weight: 700; color: #111827; }
.pp-cycle-note { font-size: 12.5px; color: #6b7280; margin-top: 6px; }
.pp-cancel { display: inline-block; margin-top: 18px; font-size: 13px; color: #0070ba; }
.pp-login h2, .pp-pay h2, .pp-done h2 { font-size: 20px; color: #111827; margin-bottom: 6px; }
.pp-sub { font-size: 13.5px; color: #6b7280; margin-bottom: 18px; line-height: 1.7; }
.pp-field { margin-bottom: 14px; }
.pp-field label { display: block; font-size: 12.5px; font-weight: 600; color: #374151; margin-bottom: 5px; }
.pp-field input {
  width: 100%; padding: 11px 12px; border: 1px solid #cbd2dc; border-radius: 8px;
  font-size: 15px; outline: none; font-family: inherit; color: #111827; background: #fff;
}
.pp-field input:focus { border-color: #0070ba; box-shadow: 0 0 0 3px rgba(0,112,186,.15); }
.pp-err { color: #e5484d; font-size: 12.5px; margin-top: 5px; display: none; }
.pp-field.invalid input { border-color: #e5484d; }
.pp-field.invalid .pp-err { display: block; }
.pp-btn {
  width: 100%; padding: 12px; border-radius: 24px; border: 0; font-size: 15px;
  font-weight: 700; cursor: pointer; font-family: inherit; transition: filter .2s;
}
.pp-btn:disabled { opacity: .75; cursor: wait; }
.pp-btn-primary { background: #ffc439; color: #003087; }
.pp-btn-primary:hover { filter: brightness(1.04); }
.pp-btn-blue { background: #0070ba; color: #fff; }
.pp-btn-blue:hover { filter: brightness(1.08); }
.pp-btn-pay { background: #0070ba; color: #fff; }
.pp-btn-pay:hover { filter: brightness(1.08); }
.pp-links { display: flex; justify-content: space-between; margin-top: 14px; font-size: 13px; flex-wrap: wrap; gap: 8px; }
.pp-links a { color: #0070ba; }
.pp-divider { display: flex; align-items: center; gap: 10px; color: #9ca3af; font-size: 12px; margin: 18px 0; }
.pp-divider::before, .pp-divider::after { content: ""; flex: 1; height: 1px; background: #e5e7eb; }
.pp-method {
  display: flex; align-items: center; gap: 12px; border: 2px solid #0070ba;
  border-radius: 10px; padding: 14px; margin-bottom: 16px;
}
.pp-method .pp-bal-logo {
  width: 36px; height: 36px; border-radius: 50%; background: #003087; color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 12px; flex-shrink: 0;
}
.pp-method b { display: block; font-size: 14px; color: #111827; }
.pp-method span { font-size: 12.5px; color: #6b7280; }
.pp-amount-box {
  background: #f5f7fa; border-radius: 10px; padding: 16px; display: flex;
  justify-content: space-between; align-items: center; margin-bottom: 18px;
}
.pp-amount-box span { font-size: 13.5px; color: #374151; }
.pp-amount-box b { font-size: 20px; color: #111827; }
.pp-done-icon {
  width: 64px; height: 64px; border-radius: 50%; background: #d1f2e1; color: #0e9f6e;
  display: grid; place-items: center; font-size: 30px; margin: 0 auto 16px;
}
.pp-center { text-align: center; }
.pp-actions { display: flex; gap: 12px; justify-content: center; margin-top: 20px; flex-wrap: wrap; }
.pp-actions .btn { border-radius: 24px; }
.pp-footer {
  text-align: center; font-size: 12px; color: #9ca3af; padding: 26px 24px;
  max-width: 760px; margin: 0 auto; line-height: 1.7;
}
.pp-spin {
  display: inline-block; width: 15px; height: 15px; border: 2px solid rgba(0,48,135,.3);
  border-top-color: #003087; border-radius: 50%; animation: ppSpin .8s linear infinite;
  vertical-align: -3px; margin-right: 8px;
}
.pp-btn-pay .pp-spin, .pp-btn-blue .pp-spin { border-color: rgba(255,255,255,.35); border-top-color: #fff; }
@keyframes ppSpin { to { transform: rotate(360deg); } }
@media (max-width: 860px) {
  .pp-shell { grid-template-columns: 1fr; margin: 24px auto; }
}