/* ============================================================
   楚星智能企业官网样式
   配色：主蓝 #1e63d0 / 深蓝 #16233d / 点缀橙 #f5a623
   ============================================================ */

:root {
  --primary: #1e63d0;
  --primary-dark: #174ba3;
  --ink: #16233d;
  --ink-soft: #46536b;
  --muted: #7b869c;
  --line: #e3e9f2;
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --accent: #f5a623;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(22, 35, 61, 0.08);
  --shadow-hover: 0 16px 40px rgba(22, 35, 61, 0.14);
  --container: 1160px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(var(--container), 92%);
  margin: 0 auto;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  border: 0;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
  text-align: center;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: #fff;
  box-shadow: 0 8px 20px rgba(30, 99, 208, .3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(30, 99, 208, .4); }
.btn-ghost {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-ghost:hover { background: rgba(30, 99, 208, .08); transform: translateY(-2px); }
.btn-block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s ease, border-color .3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 4px 18px rgba(22, 35, 61, .07);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
  flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text strong { font-size: 19px; letter-spacing: 1px; color: var(--ink); }
.logo-text small { font-size: 10px; letter-spacing: 2.5px; color: var(--muted); }

.site-nav { margin-left: auto; }
.site-nav ul { display: flex; gap: 6px; }
.site-nav a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--ink-soft);
  border-radius: 8px;
  transition: all .2s ease;
}
.site-nav a:hover { color: var(--primary); background: rgba(30, 99, 208, .07); }
.site-nav a.active { color: var(--primary); font-weight: 600; }

.header-cta { padding: 9px 22px; font-size: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 6px;
  cursor: pointer;
}
.nav-toggle span {
  width: 24px; height: 2.5px;
  background: var(--ink);
  border-radius: 2px;
  transition: all .25s ease;
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: 72px 0 84px;
  background:
    radial-gradient(ellipse 60% 50% at 85% 10%, rgba(59, 130, 246, .10), transparent),
    radial-gradient(ellipse 40% 40% at 5% 90%, rgba(30, 99, 208, .08), transparent),
    linear-gradient(180deg, #f7fafd 0%, #fff 100%);
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--primary);
  border: 1px solid rgba(30, 99, 208, .35);
  background: rgba(30, 99, 208, .06);
  padding: 4px 16px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1.25;
  letter-spacing: 1px;
  margin-bottom: 18px;
}
.hero-sub {
  font-size: 16.5px;
  color: var(--ink-soft);
  margin-bottom: 28px;
  max-width: 560px;
}
.hero-sub strong { color: var(--primary); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 12px 34px;
  justify-content: start;
}
.hero-stats strong {
  display: block;
  font-size: 24px;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}
.hero-stats span { font-size: 12.5px; color: var(--muted); }

.hero-media img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  border: 1px solid var(--line);
}

/* ---------- 通用 section ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; margin-bottom: 48px; }
.section-eyebrow {
  font-size: 12.5px;
  letter-spacing: 4px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 8px;
}
.section-head h2 {
  font-size: clamp(26px, 3vw, 34px);
  letter-spacing: 1px;
}
.section-sub { color: var(--muted); margin-top: 10px; font-size: 15.5px; }

/* ---------- 关于我们 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 44px;
  align-items: center;
  margin-bottom: 44px;
}
.about-text h3 { font-size: 22px; margin-bottom: 14px; color: var(--ink); }
.about-text p { color: var(--ink-soft); margin-bottom: 12px; font-size: 15.5px; }
.about-text strong { color: var(--primary); }
.about-media img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card-grid.three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.card-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(30, 99, 208, .09);
  border-radius: 6px;
  padding: 2px 10px;
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { font-size: 14.5px; color: var(--ink-soft); }

.value-bar {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  background: linear-gradient(135deg, var(--ink), #24365c);
  border-radius: var(--radius);
  padding: 30px 34px;
  color: #fff;
}
.value-item h4 { color: var(--accent); font-size: 15px; margin-bottom: 4px; }
.value-item p { font-size: 14.5px; color: rgba(255, 255, 255, .88); }

/* ---------- 产品中心 ---------- */
.product-list { display: flex; flex-direction: column; gap: 34px; }
.product-card {
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  gap: 36px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  scroll-margin-top: 90px;
}
.product-card.reverse .product-media { order: 2; }
.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
}
.product-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(30, 99, 208, .08);
  padding: 3px 14px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.product-body h3 {
  font-size: 25px;
  margin-bottom: 10px;
  letter-spacing: 1px;
}
.product-desc { color: var(--ink-soft); font-size: 15px; margin-bottom: 16px; }
.spec-list { border-top: 1px dashed var(--line); padding-top: 14px; margin-bottom: 14px; }
.spec-list li {
  display: flex;
  gap: 12px;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 5px 0;
}
.spec-list li span {
  flex-shrink: 0;
  font-weight: 600;
  color: var(--ink);
  min-width: 76px;
}
.product-apply { font-size: 13.5px; color: var(--muted); }
.product-apply::before {
  content: "应用行业";
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  border-radius: 4px;
  padding: 1px 8px;
  margin-right: 8px;
}

/* ---------- 产品矩阵 ---------- */
.table-wrap {
  overflow-x: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 30px;
}
.matrix-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 14.5px;
}
.matrix-table caption {
  text-align: left;
  padding: 18px 22px 4px;
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
}
.matrix-table th, .matrix-table td {
  padding: 14px 22px;
  text-align: left;
  border-top: 1px solid var(--line);
}
.matrix-table thead th {
  background: var(--bg-alt);
  color: var(--ink);
  font-size: 14px;
  letter-spacing: 1px;
}
.matrix-table tbody th { color: var(--primary); white-space: nowrap; }
.matrix-table tbody td { color: var(--ink-soft); }
.matrix-table tbody tr:hover { background: rgba(30, 99, 208, .04); }
.matrix-table a { color: var(--primary); font-weight: 600; }
.matrix-table a:hover { text-decoration: underline; }

.case-box {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  padding: 28px 30px;
  box-shadow: var(--shadow);
}
.case-box h3 { font-size: 17px; margin-bottom: 22px; }
.case-flow {
  display: flex;
  align-items: stretch;
  gap: 14px;
  flex-wrap: wrap;
}
.case-flow > li {
  flex: 1;
  min-width: 200px;
  background: var(--bg-alt);
  border-radius: 10px;
  padding: 20px 18px;
  text-align: center;
}
.step-icon {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  width: 38px; height: 38px;
  line-height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  margin-bottom: 10px;
}
.case-flow h4 { font-size: 15.5px; margin-bottom: 4px; }
.case-flow p { font-size: 13.5px; color: var(--ink-soft); }
.flow-arrow {
  align-self: center;
  font-size: 22px;
  color: var(--primary);
  font-weight: 700;
}

/* ---------- 服务体系 ---------- */
.service-card { text-align: center; }
.service-card .card-num {
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: #fff;
  padding: 4px 16px;
  border-radius: 999px;
}
.service-note {
  margin-top: 30px;
  text-align: center;
  background: #fff;
  border: 1px dashed rgba(30, 99, 208, .4);
  border-radius: var(--radius);
  padding: 20px 26px;
  font-size: 15.5px;
  color: var(--ink-soft);
}
.service-note strong { color: var(--primary); }

/* ---------- 联系我们 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 40px;
  align-items: start;
}
.contact-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.contact-item {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.contact-item h4 {
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.contact-main { font-size: 15.5px; font-weight: 600; color: var(--ink); word-break: break-all; }

.contact-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
}
.form-row { margin-bottom: 16px; }
.form-row label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}
.form-row label span { color: #e0533d; }
.form-row input, .form-row textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14.5px;
  font-family: inherit;
  color: var(--ink);
  background: var(--bg-alt);
  transition: border-color .2s ease, box-shadow .2s ease;
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 99, 208, .12);
  background: #fff;
}
.form-tip { font-size: 12.5px; color: var(--muted); margin-top: 12px; text-align: center; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #101a30;
  color: rgba(255, 255, 255, .78);
  padding-top: 56px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 1.2fr;
  gap: 36px;
  padding-bottom: 40px;
}
.logo-light { color: #5ea0ff; }
.logo-light .logo-text strong { color: #fff; }
.footer-desc { font-size: 13.5px; margin-top: 14px; color: rgba(255, 255, 255, .6); }
.footer-col h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.footer-col ul li { margin-bottom: 8px; font-size: 13.5px; }
.footer-col a:hover { color: #5ea0ff; }
.footer-bar {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 18px 0;
}
.footer-bar .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, .5);
}
.footer-bar a:hover { color: #5ea0ff; }

/* ---------- 企业视频 ---------- */
.video-wrap { max-width: 880px; margin: 0 auto; }
.video-wrap video {
  width: 100%;
  display: block;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  background: #0b1220;
}
.video-desc { text-align: center; color: var(--muted); font-size: 14.5px; margin-top: 14px; }

/* ---------- 企业画册 ---------- */
.brochure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 18px;
}
.brochure-item {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.brochure-item img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  cursor: zoom-in;
  transition: transform .3s ease;
}
.brochure-item:hover img { transform: scale(1.04); }
.brochure-item figcaption { padding: 10px 14px; font-size: 13.5px; color: var(--ink-soft); }

/* ---------- 画册灯箱 ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10, 15, 25, .88);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all .25s ease;
}
.lightbox.show { opacity: 1; visibility: visible; }
.lightbox img { max-width: 92vw; max-height: 86vh; border-radius: 8px; }
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 26px;
  background: none;
  border: 0;
  color: #fff;
  font-size: 36px;
  line-height: 1;
  cursor: pointer;
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 0;
  background: var(--primary);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(30, 99, 208, .35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .3s ease;
  z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background: var(--primary-dark); }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .hero-stats { grid-template-columns: repeat(2, auto); }
  .about-grid { grid-template-columns: 1fr; }
  .card-grid.three { grid-template-columns: 1fr 1fr; }
  .product-card, .product-card.reverse { grid-template-columns: 1fr; }
  .product-card.reverse .product-media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  /* 移动端菜单 */
  .header-cta { display: none; }
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    top: 72px;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 30px rgba(22, 35, 61, .12);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: all .25s ease;
  }
  .site-nav.open { transform: none; opacity: 1; visibility: visible; }
  .site-nav ul { flex-direction: column; padding: 10px 4%; }
  .site-nav a { padding: 13px 10px; border-radius: 8px; font-size: 16px; }
}

@media (max-width: 560px) {
  .section { padding: 60px 0; }
  .hero { padding: 48px 0 60px; }
  .card-grid.three { grid-template-columns: 1fr; }
  .value-bar { grid-template-columns: 1fr; gap: 18px; }
  .contact-info { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .flow-arrow { display: none; }
}