/* 零度智能官网 - 明亮科技风 */
:root {
  --bg: #ffffff;
  --bg-soft: #f4f9fd;
  --ink: #10263f;
  --ink-2: #65768a;
  --accent: #0968eb;
  --accent-dark: #0752b8;
  --border: #e3ecf5;
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  font-size: 16px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }

/* 顶部公告 */
.topbar { background: var(--accent); color: #fff; font-size: 13px; text-align: center; padding: 6px 16px; }
.topbar a { color: #fff; text-decoration: underline; }

/* 导航 */
.site-header { border-bottom: 1px solid var(--border); background: #fff; position: sticky; top: 0; z-index: 50; }
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand .logo {
  height: 38px; padding: 0 10px; border-radius: 9px; background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; white-space: nowrap;
}
.brand small { display: block; font-weight: 400; font-size: 11px; color: var(--ink-2); }
.nav-links { display: flex; gap: 4px; list-style: none; }
.nav-links a { padding: 8px 14px; border-radius: 8px; font-size: 15px; color: var(--ink); }
.nav-links a:hover { background: var(--bg-soft); }
.nav-links a.active { color: var(--accent); font-weight: 600; }
.nav-cta { background: var(--accent); color: #fff !important; padding: 9px 18px !important; border-radius: 8px; }
.nav-cta:hover { background: var(--accent-dark); }
.menu-btn { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; font-size: 16px; cursor: pointer; }
.menu-btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* 首屏 */
.hero { background: linear-gradient(180deg, var(--bg-soft) 0%, #fff 100%); padding: 72px 0 64px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(32px, 4.5vw, 52px); line-height: 1.25; font-weight: 700; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p.lead { margin: 18px 0 28px; color: var(--ink-2); font-size: 17px; max-width: 34em; }
.btn { display: inline-block; padding: 12px 26px; border-radius: 8px; font-size: 15px; font-weight: 600; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border-color: var(--accent); color: var(--accent); margin-left: 12px; }
.btn-ghost:hover { background: #eaf2fd; }
.hero-panel { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: 0 8px 30px rgba(9,104,235,.06); }
.hero-panel h2 { font-size: 17px; margin-bottom: 14px; }
.hero-panel ul { list-style: none; }
.hero-panel li { padding: 9px 0; border-bottom: 1px dashed var(--border); font-size: 14.5px; display: flex; justify-content: space-between; gap: 12px; }
.hero-panel li:last-child { border-bottom: none; }
.hero-panel li span:first-child { color: var(--ink-2); flex-shrink: 0; }
.hero-panel li span:last-child { text-align: right; font-weight: 600; }

/* 区块通用 */
.section { padding: 64px 0; }
.section.alt { background: var(--bg-soft); }
.section-head { max-width: 720px; margin-bottom: 36px; }
.section-head .kicker { color: var(--accent); font-weight: 600; font-size: 14px; letter-spacing: 2px; }
.section-head h2 { font-size: clamp(26px, 3vw, 36px); margin: 6px 0 10px; }
.section-head p { color: var(--ink-2); }

/* 卖点四宫格 */
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; min-width: 0; }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--ink-2); font-size: 14.5px; }
.card .tag { display: inline-block; font-size: 12.5px; color: var(--accent); background: #eaf2fd; border-radius: 999px; padding: 2px 12px; margin-bottom: 12px; }
.card a.more { display: inline-block; margin-top: 14px; color: var(--accent); font-weight: 600; font-size: 14.5px; }

/* 产品速览 */
.product-card { display: flex; flex-direction: column; }
.product-visual { background: linear-gradient(135deg, #eaf2fd, #f7fbff); border-radius: 10px; height: 150px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; color: var(--accent); font-weight: 700; letter-spacing: 1px; }

/* 实力条 */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; text-align: center; }
.stats .num { font-size: 34px; font-weight: 700; color: var(--accent); }
.stats .label { color: var(--ink-2); font-size: 14px; }

/* 行动区 */
.cta-band { background: var(--accent); color: #fff; border-radius: 16px; padding: 44px 40px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta-band h2 { font-size: 24px; margin-bottom: 6px; }
.cta-band p { opacity: .9; font-size: 15px; }
.cta-band .btn { background: #fff; color: var(--accent); }
.cta-band .btn:hover { background: #eaf2fd; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); background: #fbfdff; padding: 44px 0 28px; margin-top: 64px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.site-footer h4 { font-size: 15px; margin-bottom: 12px; }
.site-footer ul { list-style: none; }
.site-footer li { padding: 4px 0; color: var(--ink-2); }
.site-footer a:hover { color: var(--accent); }
.copyright { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--ink-2); font-size: 13px; text-align: center; }

/* 表格 */
table.spec { width: 100%; border-collapse: collapse; font-size: 14.5px; background: #fff; }
table.spec th, table.spec td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; }
table.spec th { background: var(--bg-soft); width: 180px; color: var(--ink); }
.pending { color: #b45309; background: #fef3c7; border-radius: 4px; padding: 1px 6px; font-size: 13px; }

/* 表单 */
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-grid .full { grid-column: 1 / -1; }
label { font-size: 14px; font-weight: 600; display: block; margin-bottom: 6px; }
input, textarea, select {
  width: 100%; padding: 11px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 15px; font-family: inherit; color: var(--ink); background: #fff;
}
textarea { min-height: 110px; resize: vertical; }
.form-note { font-size: 13px; color: var(--ink-2); margin-top: 10px; }

/* FAQ */
.faq details { border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; margin-bottom: 12px; background: #fff; }
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { margin-top: 10px; color: var(--ink-2); }

/* 面包屑 */
.crumbs { font-size: 13.5px; color: var(--ink-2); padding: 18px 0 0; }
.crumbs a { color: var(--ink-2); }
.crumbs a:hover { color: var(--accent); }

/* 响应式 */
@media (max-width: 960px) {
  .hero-grid, .grid-4, .grid-3, .stats, .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0; background: #fff;
    flex-direction: column; padding: 12px 20px 20px; border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; }
}
@media (max-width: 620px) {
  .hero-grid, .grid-4, .grid-3, .grid-2, .stats, .footer-grid, .form-grid { grid-template-columns: minmax(0, 1fr); }
  .btn-ghost { margin-left: 0; margin-top: 10px; }
  .section { padding: 48px 0; }
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }