/* 产品首页样式。颜色与控制台一致（apps/web/src/theme/tokens.css 的主色 #3370ff），只用系统字体。 */
:root {
  --primary: #3370ff;
  --primary-hover: #4e83fd;
  --primary-soft: #e1eaff;
  --text: #1f2329;
  --text-2: #4e5969;
  --text-3: #86909c;
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --border: #e5e6eb;
  --card: #ffffff;
  --shadow: 0 1px 2px rgba(31, 35, 41, 0.04), 0 8px 24px rgba(31, 35, 41, 0.06);
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #4e83fd;
    --primary-hover: #6b97ff;
    --primary-soft: rgba(78, 131, 253, 0.16);
    --text: #e5e6eb;
    --text-2: #c9cdd4;
    --text-3: #8f959e;
    --bg: #17181a;
    --bg-alt: #1f2022;
    --border: #2e3033;
    --card: #232427;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

h1, h2, h3 { margin: 0; line-height: 1.3; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

/* ---- 页头 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 32px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; font-size: 18px; }
.brand:hover { color: var(--text); }
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #7b61ff);
}
.nav { display: flex; gap: 24px; }
.nav a { color: var(--text-2); }
.nav a:hover { color: var(--text); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 16px; }
.link { color: var(--text-2); }

/* ---- 按钮 ---- */
.button {
  display: inline-flex; align-items: center; justify-content: center;
  height: 44px; padding: 0 22px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  font-weight: 500; transition: background-color .15s, border-color .15s, color .15s;
}
.button:hover { border-color: var(--primary); color: var(--primary); }
.button-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.button-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #fff; }
.button-small { height: 36px; padding: 0 16px; font-size: 14px; }

/* ---- 首屏 ---- */
.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(800px 360px at 15% -10%, var(--primary-soft), transparent 70%),
    radial-gradient(700px 320px at 95% 0%, color-mix(in srgb, #7b61ff 14%, transparent), transparent 70%);
}
.hero-inner { max-width: 860px; text-align: center; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); letter-spacing: -0.01em; }
.lead { margin: 24px auto 0; max-width: 720px; color: var(--text-2); font-size: 18px; }
.hero-actions { display: flex; justify-content: center; gap: 12px; margin-top: 36px; flex-wrap: wrap; }
.hero-note { margin-top: 16px; color: var(--text-3); font-size: 14px; }
.providers {
  display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 8px;
  margin-top: 40px; color: var(--text-3); font-size: 14px;
}
.providers span {
  padding: 4px 12px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--card); color: var(--text-2);
}

/* ---- 通用区块 ---- */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 { font-size: clamp(26px, 3.4vw, 34px); text-align: center; }
.section-lead { margin: 12px 0 0; text-align: center; color: var(--text-2); }

.grid { list-style: none; margin: 48px 0 0; padding: 0; display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  position: relative;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.feature h3 { font-size: 18px; }
.feature p { margin: 10px 0 0; color: var(--text-2); }

/* ---- 三步接入 ---- */
.steps { list-style: none; margin: 48px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.step { text-align: center; }
.step-no {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary); font-weight: 600; font-size: 18px;
}
.step h3 { margin-top: 16px; font-size: 18px; }
.step p { margin: 8px auto 0; max-width: 300px; color: var(--text-2); }

/* ---- 价格 ---- */
.plans { align-items: stretch; }
.plan { display: flex; flex-direction: column; }
.plan h3 { font-size: 20px; }
.plan-summary { margin: 6px 0 0; color: var(--text-3); font-size: 14px; }
.plan-price { margin: 20px 0 0; }
.plan-price .amount { font-size: 36px; font-weight: 700; }
.plan-price .unit { color: var(--text-2); }
.plan-items { list-style: none; margin: 20px 0 28px; padding: 0; flex: 1; }
.plan-items li { position: relative; padding-left: 24px; margin-top: 10px; color: var(--text-2); }
.plan-items li::before {
  content: ""; position: absolute; left: 2px; top: 9px; width: 10px; height: 6px;
  border-left: 2px solid var(--primary); border-bottom: 2px solid var(--primary); transform: rotate(-45deg);
}
.plan-featured { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary), var(--shadow); }
.badge {
  position: absolute; top: -12px; right: 24px;
  padding: 2px 12px; border-radius: 999px; background: var(--primary); color: #fff; font-size: 13px;
}
/* 企业版的「价格请联系我们」比数字长，字号收小一些。 */
.plan:last-child .plan-price .amount { font-size: 26px; }
.pricing-note { margin-top: 28px; text-align: center; color: var(--text-3); font-size: 14px; }

/* ---- 常见问题 ---- */
.faq-item { border-bottom: 1px solid var(--border); padding: 18px 0; }
.faq-item:first-of-type { margin-top: 32px; border-top: 1px solid var(--border); }
.faq-item summary { cursor: pointer; font-weight: 500; font-size: 17px; list-style: none; position: relative; padding-right: 28px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 4px; top: -2px; color: var(--text-3); font-size: 22px; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 10px 0 0; color: var(--text-2); }

/* ---- 联系我们 ---- */
.contact { display: flex; align-items: center; justify-content: center; gap: 56px; flex-wrap: wrap; }
.contact h2 { text-align: left; }
.contact p { margin: 12px 0 0; color: var(--text-2); max-width: 420px; }
.contact-hint { font-weight: 500; color: var(--text) !important; }
.contact-qr {
  width: 160px; height: 160px; border-radius: var(--radius);
  border: 1px solid var(--border); background: #fff; padding: 8px;
}

/* ---- 页脚 ---- */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; color: var(--text-3); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.records { display: flex; gap: 10px; flex-wrap: wrap; }
.records a { color: var(--text-3); }
.records a:hover { color: var(--text-2); }

/* ---- 窄屏 ---- */
@media (max-width: 880px) {
  .grid-3, .steps { grid-template-columns: 1fr; }
  .nav { display: none; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 64px 0; }
  .header-inner { gap: 16px; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .link { display: none; }
  .lead { font-size: 16px; }
}