/* ==========================================================================
   科技型企业官网 — 设计系统 (参考 corporate-website 风格全面美化)
   现代化 / 专业 / 简洁大气
   ========================================================================== */

/* ---------- 设计令牌 (Design Tokens) ---------- */
:root {
  /* 主色调 — 专业蓝 */
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-light: #3b82f6;
  --brand-lighter: #dbeafe;
  --brand-bg: #eff6ff;

  /* 深色海军蓝 (页脚/深色区域) */
  --navy: #0f172a;
  --navy-light: #1e293b;

  /* 强调色 */
  --accent: #f59e0b;
  --accent-light: #fbbf24;

  /* 中性色 */
  --ink: #1e293b;
  --ink-soft: #334155;
  --muted: #64748b;
  --muted-light: #94a3b8;
  --line: #e6eaf0;
  --line-soft: #eef2f7;

  --bg: #f6f8fc;
  --bg-card: #ffffff;

  /* 功能色 */
  --success: #10b981;
  --success-bg: #d1fae5;
  --error: #ef4444;
  --error-bg: #fee2e2;

  /* 渐变 */
  --gradient-brand: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --gradient-hero: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
  --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
  --gradient-navy: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);

  /* 圆角 */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 布局 */
  --container-max: 1160px;
  --navbar-height: 72px;

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* 过渡 */
  --transition: 0.25s ease;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background-color: var(--bg);
  line-height: 1.75;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: var(--brand); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { width: min(var(--container-max), 92vw); margin-inline: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--brand); color: #fff;
  padding: 11px 22px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 15px; border: none; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  box-shadow: var(--shadow-sm);
}
.btn:hover { background: var(--brand-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }

.btn.ghost, .btn-outline {
  background: transparent; color: var(--brand);
  border: 1.5px solid var(--brand); box-shadow: none;
}
.btn.ghost:hover, .btn-outline:hover { background: var(--brand-bg); color: var(--brand-dark); transform: translateY(-2px); }

.btn.dark { background: var(--navy); color: #fff; }
.btn.dark:hover { background: #000; color: #fff; }

.btn.btn-lg { padding: 14px 30px; font-size: 16px; border-radius: var(--radius-sm); }

.btn-primary { background: var(--gradient-brand); color: #fff; }
.btn-primary:hover { color: #fff; box-shadow: var(--shadow-lg); }

/* ==========================================================================
   导航栏
   ========================================================================== */
.site-header, .navbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow var(--transition), background var(--transition);
}
.navbar.scrolled, .site-header.scrolled { box-shadow: var(--shadow-md); }

.nav, .navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--navbar-height);
}

.logo {
  font-weight: 800; font-size: 20px; color: var(--ink);
  display: flex; align-items: center; gap: 10px;
}
.logo:hover { color: var(--ink); }
.logo .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--brand); box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}
/* logo 字母方块图标（参考站风格） */
.logo-icon {
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--gradient-brand); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 20px; box-shadow: var(--shadow-md);
}
.logo-text { color: var(--ink); letter-spacing: .3px; }

.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  color: var(--ink-soft); font-weight: 500; position: relative; padding: 6px 0;
  transition: color var(--transition);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--brand); border-radius: 2px; transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active, .nav-link.active { color: var(--brand); }
.nav-links a:hover::after, .nav-links a.active::after, .nav-link.active::after { width: 100%; }

.lang-switch { display: flex; gap: 6px; font-size: 13px; align-items: center; }
.lang-switch a, .lang-btn {
  padding: 5px 11px; border: 1px solid var(--line); border-radius: var(--radius-full);
  color: var(--muted); background: #fff; cursor: pointer; font-size: 13px; line-height: 1;
  transition: all var(--transition);
}
.lang-switch a.active, .lang-btn.active {
  background: var(--brand); color: #fff; border-color: var(--brand);
}
.lang-switch a:hover { color: var(--brand); }

.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 40px; height: 40px; position: relative;
}
.menu-toggle span, .menu-toggle::before, .menu-toggle::after {
  content: ""; position: absolute; left: 9px; right: 9px; height: 2px;
  background: var(--ink); border-radius: 2px; transition: var(--transition);
}
.menu-toggle::before { top: 13px; } .menu-toggle span { top: 19px; } .menu-toggle::after { top: 25px; }

/* ==========================================================================
   Hero / Banner
   ========================================================================== */
.hero {
  position: relative; overflow: hidden;
  border-radius: var(--radius-lg); margin: 26px 0;
  background: var(--gradient-hero); color: #fff;
  min-height: 420px; display: flex; align-items: center;
  box-shadow: var(--shadow-xl);
}
.hero .slide {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  opacity: 0; transition: opacity .7s ease;
}
.hero .slide.active { opacity: 1; }
.hero .slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(15, 23, 42, .82), rgba(37, 99, 235, .55));
}
.hero-inner {
  position: relative; z-index: 3; padding: 0 48px; max-width: 720px;
}
.hero h1 {
  font-size: clamp(30px, 4vw, 44px); margin: 14px 0 14px; line-height: 1.2; font-weight: 800;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .25);
}
.hero p { font-size: 17px; opacity: .95; margin: 0 0 24px; max-width: 560px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, .15); border: 1px solid rgba(255, 255, 255, .25);
  padding: 6px 14px; border-radius: var(--radius-full);
  font-size: 13px; font-weight: 500; backdrop-filter: blur(4px);
}
.hero-badge-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent-light);
  box-shadow: 0 0 0 4px rgba(251, 191, 36, .3); animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.4); } }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .btn.ghost, .hero .btn-outline {
  background: rgba(255, 255, 255, .12); color: #fff; border-color: rgba(255, 255, 255, .6);
}
.hero .btn.ghost:hover, .hero .btn-outline:hover { background: #fff; color: var(--brand); }

.hero-stats {
  display: flex; gap: 38px; margin-top: 34px; flex-wrap: wrap;
}
.hero-stat-value { font-size: 30px; font-weight: 800; line-height: 1; }
.hero-stat-label { font-size: 13px; opacity: .85; margin-top: 4px; }

.hero-dots {
  position: absolute; bottom: 22px; left: 48px; z-index: 4; display: flex; gap: 8px;
}
.hero-dots span {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255, 255, 255, .5); cursor: pointer; transition: var(--transition);
}
.hero-dots span.active { background: #fff; width: 26px; border-radius: 6px; }

/* Hero 右侧视觉卡（首页无 banner 时可选） */
.hero-visual { position: relative; z-index: 3; }
.hero-card {
  background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .25);
  border-radius: var(--radius-lg); padding: 22px; backdrop-filter: blur(6px);
}
.hero-card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hero-card-item {
  background: rgba(255, 255, 255, .1); border-radius: var(--radius-sm);
  padding: 16px; text-align: center; transition: var(--transition);
}
.hero-card-item:hover { background: rgba(255, 255, 255, .2); transform: translateY(-3px); }
.hero-card-icon { font-size: 26px; }
.hero-card-label { font-size: 13px; margin-top: 6px; }

/* ==========================================================================
   区块通用
   ========================================================================== */
.section { margin: 56px 0; }
.section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: 26px; gap: 16px;
}
.section-head h2 { font-size: 28px; margin: 0; color: var(--ink); }
.section-head .more { font-size: 14px; color: var(--muted); white-space: nowrap; }
.section-head .more:hover { color: var(--brand); }

.section-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px;
  color: var(--brand); text-transform: uppercase; margin-bottom: 10px;
  position: relative; padding-left: 0;
}
.section-eyebrow::before {
  content: ""; display: inline-block; width: 22px; height: 2px;
  background: var(--accent); margin-right: 10px; vertical-align: middle;
}
.section-header { text-align: center; max-width: 640px; margin: 0 auto 40px; }
.section-header .section-eyebrow::before { display: none; }
.section-title { font-size: clamp(26px, 3vw, 34px); margin: 0 0 12px; color: var(--ink); }
.section-subtitle { color: var(--muted); font-size: 16px; margin: 0; }

/* ==========================================================================
   卡片网格
   ========================================================================== */
.grid { display: grid; gap: 24px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }

.card .thumb {
  height: 180px; background: var(--gradient-brand) center/cover no-repeat;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255, 255, 255, .9); font-size: 44px;
  position: relative;
}
.card .thumb::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,.18));
}
.card .body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.card h3 { margin: 0 0 8px; font-size: 18px; color: var(--ink); }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.tag {
  display: inline-block; background: var(--brand-bg); color: var(--brand);
  font-size: 12px; padding: 3px 12px; border-radius: var(--radius-full); margin-bottom: 10px;
  font-weight: 600;
}

/* 卡片阅读更多链接（首页/产品） */
.card-link {
  margin-top: auto; padding-top: 14px; display: inline-flex; align-items: center; gap: 6px;
  color: var(--brand); font-weight: 600; font-size: 14px;
}
.card-link svg { transition: transform var(--transition); }
.card:hover .card-link svg { transform: translateX(4px); }

/* ==========================================================================
   介绍条 / 优势列表
   ========================================================================== */
.intro-band {
  background: var(--gradient-navy); color: #fff;
  border-radius: var(--radius-lg); padding: 44px;
  display: flex; gap: 30px; align-items: center; flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.intro-band h2 { margin: 0 0 10px; font-size: 26px; }
.intro-band p { margin: 0; opacity: .9; max-width: 620px; }

/* 首页优势列表 */
.advantage-list { display: flex; flex-direction: column; gap: 18px; margin-top: 26px; }
.advantage-item { display: flex; gap: 14px; align-items: flex-start; }
.advantage-icon {
  flex: none; width: 44px; height: 44px; border-radius: 12px;
  background: var(--brand-bg); color: var(--brand);
  display: flex; align-items: center; justify-content: center;
}
.advantage-content h4 { margin: 0 0 4px; font-size: 16px; color: var(--ink); }
.advantage-content p { margin: 0; color: var(--muted); font-size: 14px; }

/* 首页优势卡片 */
.advantage-card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.advantage-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.advantage-card .advantage-icon { margin-bottom: 14px; width: 50px; height: 50px; border-radius: 14px; }
.advantage-card h4 { margin: 0 0 8px; font-size: 17px; color: var(--ink); }
.advantage-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.section .lead { color: var(--muted); font-size: 16px; max-width: 720px; margin: 0 0 30px; }

/* ==========================================================================
   新闻列表
   ========================================================================== */
.news-item {
  display: flex; gap: 22px; padding: 20px 0; border-bottom: 1px solid var(--line);
  transition: background var(--transition); border-radius: var(--radius-sm);
}
.news-item:hover { background: var(--bg-card); padding-inline: 14px; box-shadow: var(--shadow-sm); }
.news-item .date {
  color: var(--muted); font-size: 13px; min-width: 110px;
  display: flex; flex-direction: column; gap: 8px;
}
.news-item h3 { margin: 0 0 6px; font-size: 18px; color: var(--ink); transition: color var(--transition); }
.news-item:hover h3 { color: var(--brand); }
.news-item p { margin: 0; color: var(--muted); font-size: 14px; }

/* ==========================================================================
   详情 / 文章
   ========================================================================== */
.article {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-md);
}
.article h1 { margin-top: 0; font-size: 30px; color: var(--ink); line-height: 1.3; }
.article .meta { color: var(--muted); font-size: 13px; margin-bottom: 22px; }
.article .content { font-size: 16px; color: var(--ink-soft); }
.article .content img { max-width: 100%; border-radius: var(--radius-sm); margin: 16px 0; }

/* ==========================================================================
   CTA 召唤区
   ========================================================================== */
.cta-section { margin: 64px 0; }
.cta-card {
  background: var(--gradient-brand); color: #fff;
  border-radius: var(--radius-xl); padding: 56px 40px; text-align: center;
  box-shadow: var(--shadow-xl); position: relative; overflow: hidden;
}
.cta-card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(255,255,255,.18), transparent 45%),
              radial-gradient(circle at 80% 80%, rgba(255,255,255,.12), transparent 40%);
}
.cta-card > * { position: relative; z-index: 1; }
.cta-card h2 { font-size: clamp(24px, 3vw, 32px); margin: 0 0 12px; }
.cta-card p { opacity: .92; margin: 0 0 26px; font-size: 16px; }
.cta-card .btn { background: #fff; color: var(--brand); }
.cta-card .btn:hover { color: var(--brand-dark); }

/* ==========================================================================
   联系我们
   ========================================================================== */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.1fr; gap: 32px; align-items: start; }
.contact-info {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-md);
}
.contact-info h3 { margin: 0 0 18px; font-size: 20px; color: var(--ink); }
.contact-info p { margin: 10px 0; color: var(--ink-soft); display: flex; gap: 10px; align-items: flex-start; }
.contact-info .ci-icon { color: var(--brand); flex: none; margin-top: 3px; }

.form { background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-md); }
.form label { display: block; margin: 14px 0 6px; font-weight: 600; font-size: 14px; color: var(--ink); }
.form input, .form textarea, .form select {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--line);
  border-radius: var(--radius-sm); font-size: 15px; font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition); background: #fff;
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}
.form textarea { resize: vertical; min-height: 130px; }
.form .honeypot {
  position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden;
}
.alert {
  background: var(--success-bg); color: #047857; padding: 13px 16px;
  border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 14px;
  border: 1px solid #a7f3d0;
}
.alert.err { background: var(--error-bg); color: #b91c1c; border-color: #fecaca; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer, .footer {
  background: var(--gradient-navy); color: #cbd5e1;
  margin-top: 70px; padding: 56px 0 28px;
}
.footer-cols, .footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 36px;
}
.site-footer a, .footer a { color: #9fb4d4; transition: color var(--transition); }
.site-footer a:hover, .footer a:hover { color: #fff; }
.site-footer h4, .footer-col h4 {
  color: #fff; margin: 0 0 16px; font-size: 16px; font-weight: 700;
}
.site-footer p, .footer p { margin: 6px 0; font-size: 14px; }

.footer-brand .logo, .footer-brand .logo-text { color: #fff; }
.footer-brand p { color: #94a3b8; margin: 14px 0 18px; max-width: 320px; line-height: 1.7; }
.footer-socials { display: flex; gap: 12px; }
.footer-social {
  width: 38px; height: 38px; border-radius: 10px;
  background: rgba(255, 255, 255, .08); color: #cbd5e1;
  display: inline-flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.footer-social:hover { background: var(--brand); color: #fff; transform: translateY(-3px); }

.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 14px; }
.footer-contact-item { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: #cbd5e1; }
.footer-contact-item svg { color: var(--brand-light); flex: none; margin-top: 3px; }

.footer-bottom {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .1);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: #94a3b8;
}
.footer-bottom-links { display: flex; gap: 20px; }

/* ==========================================================================
   回到顶部
   ========================================================================== */
.back-to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--gradient-brand); color: #fff; border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden;
  transform: translateY(12px); transition: var(--transition);
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-3px); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 900px) {
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr 1fr; }
  .footer-cols, .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .contact-wrap { grid-template-columns: 1fr; }
  .hero { min-height: 380px; }
  .hero-inner { padding: 0 28px; }
  .hero-dots { left: 28px; }
}

@media (max-width: 680px) {
  .nav-links, .navbar .nav-links {
    position: absolute; top: var(--navbar-height); left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0; padding: 8px 0;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.open, .navbar .nav-links.open { display: flex; }
  .nav-links a, .navbar .nav-links a { padding: 13px 22px; width: 100%; }
  .nav-links a::after, .navbar .nav-links a::after { display: none; }
  .menu-toggle { display: block; }
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
  .footer-cols, .footer-grid { grid-template-columns: 1fr; }
  .section { margin: 40px 0; }
  .intro-band, .cta-card { padding: 30px 22px; }
  .hero-stats { gap: 22px; }
  .article { padding: 26px; }
  .section-head { flex-direction: column; align-items: flex-start; }
}