/* =====================================================================
   鎏鲸官网全站样式（纯静态，无构建；所有页面共用）
   配色：深海蓝（主色）+ 鎏金（强调色），呼应「鎏鲸」二字
   ===================================================================== */

:root {
  --c-primary: #0b2545;        /* 深海蓝：导航、标题、页脚 */
  --c-primary-2: #13315c;      /* 主色浅一档：渐变与悬停 */
  --c-accent: #d4a24c;         /* 鎏金：按钮、高亮、装饰线 */
  --c-accent-2: #b8862f;       /* 鎏金深一档：悬停 */
  --c-text: #1f2937;           /* 正文 */
  --c-muted: #6b7280;          /* 次要文字 */
  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fb;        /* 分区浅底 */
  --c-line: #e5e7eb;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(11, 37, 69, 0.08);
  --maxw: 1140px;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
}
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; }
h1, h2, h3, h4 { color: var(--c-primary); line-height: 1.3; margin: 0 0 .5em; }
h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; color: var(--c-primary); }
.brand svg { width: 34px; height: 34px; }
.brand small { font-weight: 400; color: var(--c-muted); font-size: .8rem; margin-left: 2px; }
.nav-links { display: flex; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav-links a { font-weight: 500; color: var(--c-text); padding: 6px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a.active { color: var(--c-primary); border-bottom-color: var(--c-accent); }
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--c-primary); margin: 5px 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 12px 28px; border-radius: 999px;
  font-weight: 600; transition: all .2s; border: 2px solid transparent;
}
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { background: var(--c-accent-2); }
.btn-outline { border-color: #fff; color: #fff; }
.btn-outline:hover { background: rgba(255, 255, 255, .12); }
.btn-dark { border-color: var(--c-primary); color: var(--c-primary); }
.btn-dark:hover { background: var(--c-primary); color: #fff; }

/* ---------- 首页横幅 ---------- */
.hero {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-2) 60%, #1d4e89 100%);
  color: #fff; padding: 96px 0 88px; position: relative; overflow: hidden;
}
.hero::after {  /* 右下角淡淡的鲸尾装饰弧 */
  content: ""; position: absolute; right: -120px; bottom: -160px;
  width: 460px; height: 460px; border-radius: 50%;
  border: 60px solid rgba(212, 162, 76, .12);
}
.hero h1 { color: #fff; font-size: 2.8rem; margin-bottom: .4em; }
.hero p { font-size: 1.15rem; max-width: 640px; opacity: .92; }
.hero .actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero .tag { display: inline-block; color: var(--c-accent); font-weight: 600; letter-spacing: .08em; margin-bottom: 14px; }

/* ---------- 内页页头 ---------- */
.page-head {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-2) 100%);
  color: #fff; padding: 56px 0;
}
.page-head h1 { color: #fff; margin-bottom: .2em; }
.page-head p { opacity: .85; margin: 0; }

/* ---------- 分区 ---------- */
.section { padding: 72px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-title { text-align: center; margin-bottom: 44px; }
.section-title h2::after {
  content: ""; display: block; width: 48px; height: 3px; background: var(--c-accent);
  margin: 14px auto 0; border-radius: 2px;
}
.section-title p { color: var(--c-muted); max-width: 640px; margin: 0 auto; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 28px 24px; transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card .icon {
  width: 48px; height: 48px; border-radius: 10px; display: grid; place-items: center;
  background: rgba(212, 162, 76, .14); color: var(--c-accent-2); margin-bottom: 16px;
  font-size: 1.4rem; font-weight: 700;
}
.card p { color: var(--c-muted); margin: 0; font-size: .95rem; }
.card ul { margin: 8px 0 0; padding-left: 18px; color: var(--c-muted); font-size: .95rem; }

/* ---------- 双栏（产品/服务概览） ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.split .lead { font-size: 1.05rem; color: var(--c-muted); }
.split ul.checks { list-style: none; padding: 0; margin: 16px 0 24px; }
.split ul.checks li { padding-left: 28px; position: relative; margin-bottom: 8px; }
.split ul.checks li::before {
  content: "✓"; position: absolute; left: 0; color: var(--c-accent-2); font-weight: 700;
}
.illus {  /* 示意图容器：纯 CSS 面板，不依赖图片 */
  background: var(--c-bg-soft); border-radius: var(--radius); padding: 28px;
  border: 1px solid var(--c-line);
}
.illus .row { display: flex; gap: 10px; margin-bottom: 10px; }
.illus .cell {
  flex: 1; height: 44px; border-radius: 8px; background: #fff; border: 1px solid var(--c-line);
  display: grid; place-items: center; font-size: .85rem; color: var(--c-primary); font-weight: 600;
}
.illus .cell.hl { background: var(--c-primary); color: #fff; }
.illus .cell.gold { background: var(--c-accent); color: #fff; }

/* ---------- 数字亮点 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stats .num { font-size: 2.2rem; font-weight: 700; color: var(--c-accent-2); }
.stats .label { color: var(--c-muted); font-size: .95rem; }

/* ---------- 步骤流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; padding: 24px 20px 20px; background: #fff; border-radius: var(--radius); border: 1px solid var(--c-line); }
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  font-size: 1.6rem; font-weight: 700; color: var(--c-accent); display: block; margin-bottom: 6px;
}
.step p { color: var(--c-muted); margin: 0; font-size: .95rem; }

/* ---------- 行动号召 ---------- */
.cta { background: var(--c-primary); color: #fff; text-align: center; padding: 64px 0; }
.cta h2 { color: #fff; }
.cta p { opacity: .85; margin-bottom: 24px; }

/* ---------- 联系页 ---------- */
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--c-line); }
.contact-list .k { width: 88px; color: var(--c-muted); flex-shrink: 0; }
.placeholder { color: var(--c-accent-2); background: rgba(212, 162, 76, .12); padding: 0 6px; border-radius: 4px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #071a33; color: rgba(255, 255, 255, .78); padding: 48px 0 24px; font-size: .92rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 32px; margin-bottom: 32px; }
.site-footer h4 { color: #fff; margin-bottom: 12px; font-size: 1rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a:hover { color: var(--c-accent); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12); padding-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: .85rem; opacity: .75;
}

/* ---------- 404 ---------- */
.notfound { text-align: center; padding: 120px 0; }
.notfound .code { font-size: 6rem; font-weight: 700; color: var(--c-accent); line-height: 1; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-4, .stats, .steps { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  h1, .hero h1 { font-size: 2rem; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 52px 0; }
  .grid-2, .grid-3, .grid-4, .split, .stats, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  /* 移动端导航：汉堡按钮 + 折叠菜单 */
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 64px;
    flex-direction: column; gap: 0; background: #fff; border-bottom: 1px solid var(--c-line);
    padding: 8px 20px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 12px 0; border-bottom: 1px solid var(--c-line); }
}