/* ============================================================
   MMX 科学 — 公司官网样式
   现代科技风：浅色底、留白、蓝紫渐变点缀
   ============================================================ */

:root {
  --primary: #1d4ed8;
  --primary-dark: #1e3a8a;
  --accent: #06b6d4;
  --violet: #7c3aed;
  --ink: #0f172a;
  --ink-2: #334155;
  --ink-3: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --radius: 16px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .06), 0 4px 14px rgba(15, 23, 42, .05);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, .08);
  --grad: linear-gradient(120deg, #1d4ed8 0%, #06b6d4 60%, #7c3aed 120%);
  --maxw: 1160px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, .8);
}
.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: 19px; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--grad); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800; letter-spacing: .5px;
}
.brand small { font-weight: 500; color: var(--ink-3); font-size: 12px; display: block; line-height: 1.1; }

.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  padding: 8px 16px; border-radius: 999px; font-size: 15px; color: var(--ink-2);
  transition: all .2s;
}
.nav-links a:hover { color: var(--primary); background: #eff4ff; }
.nav-links a.active { color: #fff; background: var(--primary); }
.nav-cta {
  margin-left: 10px; padding: 9px 20px; border-radius: 999px;
  background: var(--grad); color: #fff !important; font-weight: 600;
  box-shadow: 0 4px 14px rgba(29, 78, 216, .3);
}
.nav-cta:hover { transform: translateY(-1px); filter: brightness(1.06); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; transition: .25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 96px 0 120px; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(640px 380px at 85% -10%, rgba(124, 58, 237, .10), transparent 60%),
    radial-gradient(720px 420px at -10% 110%, rgba(6, 182, 212, .12), transparent 60%),
    radial-gradient(500px 300px at 55% 40%, rgba(29, 78, 216, .06), transparent 65%);
  pointer-events: none;
}
.hero .container { position: relative; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; font-size: 13.5px;
  color: var(--primary); background: #eff4ff; border: 1px solid #dbe7ff; font-weight: 600;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(6, 182, 212, .15); }
.hero h1 { font-size: clamp(32px, 4.6vw, 52px); line-height: 1.22; font-weight: 800; letter-spacing: -.5px; margin: 22px 0 18px; }
.hero h1 .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 17.5px; color: var(--ink-2); max-width: 540px; margin-bottom: 34px; }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-weight: 600; font-size: 15.5px;
  transition: all .2s; cursor: pointer; border: none;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 22px rgba(29, 78, 216, .32); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(29, 78, 216, .38); }
.btn-ghost { background: #fff; color: var(--ink); border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

.hero-visual { position: relative; }
.glass-card {
  background: rgba(255, 255, 255, .78);
  border: 1px solid rgba(226, 232, 240, .9);
  border-radius: 20px; box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}
.stat-float { padding: 22px 26px; }
.stat-float .num { font-size: 30px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-float .lbl { font-size: 13.5px; color: var(--ink-3); }
.hero-visual .col { display: grid; gap: 16px; }
.hero-visual .card-b { transform: translateX(26px); }

/* ---------- 区块通用 ---------- */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-soft); }
.section-head { max-width: 680px; margin: 0 auto 54px; text-align: center; }
.section-head .tag { font-size: 13.5px; font-weight: 700; letter-spacing: 2px; color: var(--accent); text-transform: uppercase; }
.section-head h2 { font-size: clamp(26px, 3vw, 36px); font-weight: 800; margin: 10px 0 14px; letter-spacing: -.5px; }
.section-head p { color: var(--ink-3); font-size: 16px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; transition: all .25s; position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #c9dbff; }
.card .icon {
  width: 50px; height: 50px; border-radius: 13px;
  background: linear-gradient(135deg, #eff4ff, #e0f7fb);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.card h3 { font-size: 18.5px; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--ink-3); font-size: 14.5px; }
.card .more { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; color: var(--primary); font-weight: 600; font-size: 14px; }
.card .more:hover { gap: 10px; }
.card .more { transition: gap .2s; }

/* 数字带 */
.stats-band { background: var(--grad); border-radius: 22px; padding: 44px 40px; color: #fff; }
.stats-band .grid-4 { gap: 12px; }
.stat-item { text-align: center; }
.stat-item .num { font-size: 38px; font-weight: 800; }
.stat-item .num sup { font-size: 20px; }
.stat-item .lbl { opacity: .88; font-size: 14.5px; margin-top: 4px; }

/* 流程 */
.steps { counter-reset: step; }
.step { display: flex; gap: 18px; align-items: flex-start; }
.step .n {
  counter-increment: step; flex: 0 0 46px; height: 46px; border-radius: 50%;
  background: #eff4ff; color: var(--primary); font-weight: 800; font-size: 17px;
  display: flex; align-items: center; justify-content: center;
}
.step .n::before { content: counter(step, decimal-leading-zero); }
.step h4 { font-size: 16.5px; margin-bottom: 6px; }
.step p { color: var(--ink-3); font-size: 14px; }

/* 列表页横幅 */
.page-hero { padding: 84px 0 64px; position: relative; overflow: hidden; background: var(--bg-soft); }
.page-hero::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(600px 300px at 90% 0%, rgba(124, 58, 237, .10), transparent 60%),
    radial-gradient(600px 300px at 0% 100%, rgba(6, 182, 212, .12), transparent 60%);
  pointer-events: none;
}
.page-hero .container { position: relative; }
.crumbs { font-size: 13.5px; color: var(--ink-3); margin-bottom: 14px; }
.crumbs a:hover { color: var(--primary); }
.page-hero h1 { font-size: clamp(30px, 3.6vw, 42px); font-weight: 800; letter-spacing: -.5px; }
.page-hero p { color: var(--ink-3); font-size: 16.5px; margin-top: 12px; max-width: 640px; }

/* 新闻 */
.news-item { display: grid; grid-template-columns: 108px 1fr; gap: 20px; padding: 26px; align-items: start; }
.news-item .date { text-align: center; border-right: 1px solid var(--line); padding-right: 20px; }
.news-item .date .d { font-size: 30px; font-weight: 800; color: var(--primary); line-height: 1.1; }
.news-item .date .ym { font-size: 13px; color: var(--ink-3); }
.news-item h3 { font-size: 18px; margin-bottom: 8px; }
.news-item h3 a:hover { color: var(--primary); }
.news-item p { color: var(--ink-3); font-size: 14.5px; }
.news-item .cat { display: inline-block; margin-bottom: 8px; font-size: 12.5px; color: var(--accent); font-weight: 600; }

/* 联系 */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; align-items: start; }
.contact-info .item { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.contact-info .item:last-child { border-bottom: none; }
.contact-info .k { flex: 0 0 84px; font-weight: 700; color: var(--ink-2); }
.contact-info .v { color: var(--ink-3); }
.form-card { padding: 34px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--ink-2); margin-bottom: 7px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 11px;
  font-size: 14.5px; font-family: inherit; color: var(--ink); background: #fbfcfe;
  transition: border-color .2s, box-shadow .2s; outline: none;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--primary); box-shadow: 0 0 0 4px rgba(29, 78, 216, .1); background: #fff;
}
.form-note { font-size: 12.5px; color: var(--ink-3); margin-top: 12px; }
.form-ok { display: none; margin-top: 16px; padding: 14px 16px; border-radius: 11px; background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; font-size: 14px; }

/* 页脚 */
.site-footer { background: #0b1526; color: #94a3b8; padding: 64px 0 0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 44px; }
.site-footer h4 { color: #fff; font-size: 15.5px; margin-bottom: 16px; }
.site-footer a { display: block; font-size: 14px; padding: 5px 0; }
.site-footer a:hover { color: #fff; }
.site-footer .desc { font-size: 14px; margin-top: 14px; max-width: 300px; }
.footer-bottom { border-top: 1px solid rgba(148, 163, 184, .15); padding: 20px 0; font-size: 13px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* 滚动出现动画 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* 时间线（关于我们） */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--accent), var(--violet)); border-radius: 2px; }
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item::before {
  content: ""; position: absolute; left: -29px; top: 6px; width: 12px; height: 12px;
  border-radius: 50%; background: #fff; border: 3px solid var(--primary);
}
.tl-item .year { font-weight: 800; color: var(--primary); font-size: 15px; }
.tl-item h4 { font-size: 16.5px; margin: 4px 0; }
.tl-item p { color: var(--ink-3); font-size: 14px; }

/* 通用横幅 CTA */
.cta-band { background: var(--grad); border-radius: 24px; padding: 56px 48px; text-align: center; color: #fff; }
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; margin-bottom: 12px; }
.cta-band p { opacity: .9; margin-bottom: 26px; }
.btn-white { background: #fff; color: var(--primary-dark); }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,.18); }

/* 响应式 */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-visual .card-b { transform: none; }
}
@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 14px 20px 20px; gap: 4px; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.show { display: flex; }
  .nav-links a { padding: 12px 16px; }
  .nav-cta { margin: 8px 0 0; text-align: center; }
  .section { padding: 60px 0; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; }
  .news-item .date { border-right: none; border-bottom: 1px solid var(--line); text-align: left; padding: 0 0 12px; }
  .form-row { grid-template-columns: 1fr; }
  .stats-band { padding: 34px 24px; }
  .footer-grid { grid-template-columns: 1fr; }
}