/* ===== 询盘云官网 · 主题变量（改主色/辅色/圆角即可换肤） ===== */
:root {
  --c-primary: #0f4c81;
  --c-primary-dark: #0a3d68;
  --c-accent: #2f80ed;
  --c-accent-soft: #e8f1fc;
  --c-cyan: #22a0e6;
  --c-text: #1f2937;
  --c-muted: #5b6b7f;
  --c-bg: #ffffff;
  --c-bg-alt: #f4f8fd;
  --c-bg-dark: #0c2238;
  --c-border: #e3ebf3;
  --radius: 14px;
  --maxw: 1180px;
  --shadow: 0 10px 30px rgba(15, 76, 129, 0.10);
  --shadow-lg: 0 18px 50px rgba(15, 76, 129, 0.16);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.3; color: var(--c-primary-dark); }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.center { text-align: center; }
.muted { color: var(--c-muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ===== 按钮 ===== */
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 999px;
  font-weight: 600; cursor: pointer; border: 1px solid transparent;
  transition: .2s; font-size: 15px;
}
.btn-primary { background: var(--c-primary); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--c-primary-dark); text-decoration: none; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn-ghost:hover { background: var(--c-primary); color: #fff; text-decoration: none; }
.btn-light { background: #fff; color: var(--c-primary); }
.btn-light:hover { background: #eaf2fb; text-decoration: none; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--c-border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { font-size: 21px; font-weight: 800; color: var(--c-primary); letter-spacing: .5px; }
.brand span { color: var(--c-accent); }
.nav { display: flex; gap: 30px; align-items: center; }
.nav a { color: var(--c-text); font-weight: 500; font-size: 15px; }
.nav a:hover, .nav a.active { color: var(--c-primary); text-decoration: none; }
.nav-toggle { display: none; background: none; border: 0; font-size: 26px; cursor: pointer; color: var(--c-primary); }

/* ===== 首屏 Hero ===== */
.hero {
  position: relative; padding: 100px 0 84px;
  background: radial-gradient(1200px 500px at 80% -10%, rgba(47,128,237,.18), transparent),
              linear-gradient(135deg, #eaf2fc, #f6faff);
  overflow: hidden;
}
.hero .container { position: relative; z-index: 2; }
.hero h1 { font-size: clamp(30px, 5.2vw, 52px); margin-bottom: 20px; }
.hero .lead { font-size: 19px; color: var(--c-muted); max-width: 680px; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-badges { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 38px; }
.hero-badges .badge {
  background: #fff; border: 1px solid var(--c-border); border-radius: 999px;
  padding: 8px 16px; font-size: 14px; color: var(--c-primary-dark); box-shadow: var(--shadow);
}

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--c-bg-alt); }
.section-cta { background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); color: #fff; }
.section-cta h2 { color: #fff; }
.section-cta .lead { color: rgba(255,255,255,.9); }
.section h2 { font-size: clamp(26px, 3.6vw, 36px); margin-bottom: 14px; text-align: center; }
.section .sub { text-align: center; color: var(--c-muted); max-width: 720px; margin: 0 auto 44px; font-size: 17px; }

/* ===== 栅格与卡片 ===== */
.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-border); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow); transition: .2s; height: 100%;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card .ico {
  width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center;
  background: var(--c-accent-soft); color: var(--c-primary); font-size: 24px; margin-bottom: 16px;
}
.card h3 { margin-bottom: 10px; font-size: 20px; }
.card p { color: var(--c-muted); font-size: 15px; }
.card ul { margin: 12px 0 0; padding-left: 18px; color: var(--c-muted); font-size: 14.5px; }
.card ul li { margin: 6px 0; }

/* ===== 两栏 ===== */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; align-items: center; }
.media-box img { border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.media-box.alt {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  border-radius: var(--radius); padding: 40px; color: #fff; box-shadow: var(--shadow-lg);
}
.media-box.alt h3 { color: #fff; }
.media-box.alt p { color: rgba(255,255,255,.92); }

/* ===== 数据条 ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { text-align: center; padding: 30px 16px; background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow); }
.stat .num { font-size: 38px; font-weight: 800; color: var(--c-primary); line-height: 1; }
.stat .label { color: var(--c-muted); margin-top: 10px; font-size: 15px; }

/* ===== 服务详情（services 页） ===== */
.svc-item {
  display: grid; grid-template-columns: 64px 1fr; gap: 22px; align-items: start;
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 28px 30px; box-shadow: var(--shadow); margin-bottom: 22px;
}
.svc-item .ico { width: 64px; height: 64px; }
.svc-item h3 { font-size: 22px; margin-bottom: 8px; }
.svc-item p { color: var(--c-muted); }
.svc-item .tags { margin-top: 12px; display: flex; gap: 10px; flex-wrap: wrap; }
.svc-item .tag { background: var(--c-accent-soft); color: var(--c-primary); border-radius: 999px; padding: 5px 14px; font-size: 13px; }

/* ===== 案例（cases 页） ===== */
.case-card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); transition: .2s;
}
.case-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.case-card .head { background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); color: #fff; padding: 26px 28px; }
.case-card .head .industry { font-size: 13px; opacity: .9; letter-spacing: 1px; }
.case-card .head h3 { color: #fff; font-size: 22px; margin-top: 6px; }
.case-card .body { padding: 26px 28px; }
.case-card .body p { color: var(--c-muted); font-size: 15px; margin-bottom: 14px; }
.case-card .kv { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.case-card .kv span { background: var(--c-bg-alt); border-radius: 8px; padding: 6px 12px; font-size: 13px; color: var(--c-primary-dark); }
.case-card .result { border-top: 1px dashed var(--c-border); padding-top: 16px; font-size: 14.5px; color: var(--c-text); }

/* ===== 流程步骤 ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
.step { position: relative; background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 28px 24px; box-shadow: var(--shadow); }
.step::before {
  counter-increment: step; content: counter(step);
  width: 38px; height: 38px; border-radius: 50%; background: var(--c-primary); color: #fff;
  display: grid; place-items: center; font-weight: 700; margin-bottom: 14px;
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--c-muted); font-size: 14.5px; }

/* ===== 表单 ===== */
.form { max-width: 580px; margin: 0 auto; display: grid; gap: 16px; }
.form label { font-weight: 600; }
.form input, .form textarea, .form select {
  width: 100%; padding: 13px 15px; border: 1px solid var(--c-border);
  border-radius: 10px; font: inherit; background: #fff;
}
.form input:focus, .form textarea:focus { outline: 2px solid var(--c-accent); border-color: var(--c-accent); }
.form button { justify-self: start; }
.form-note { text-align: center; color: var(--c-muted); font-size: 14px; margin-top: 12px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--c-bg-dark); color: #cbd5e1; padding: 52px 0 26px; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; }
.site-footer h4 { color: #fff; font-size: 17px; margin-bottom: 14px; }
.site-footer a { color: #93c5fd; }
.site-footer p { color: #9fb2c8; margin: 6px 0; font-size: 14.5px; }
.copyright { text-align: center; margin-top: 32px; font-size: 14px; color: #6f8499; border-top: 1px solid rgba(255,255,255,.08); padding-top: 22px; }

/* ===== 响应式（768px 以下折叠导航） ===== */
@media (max-width: 860px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 66px; left: 0; right: 0; background: #fff;
    flex-direction: column; gap: 0; border-bottom: 1px solid var(--c-border);
    max-height: 0; overflow: hidden; transition: max-height .25s ease;
  }
  .nav.open { max-height: 360px; }
  .nav a { padding: 15px 22px; border-top: 1px solid var(--c-border); }
  .grid-2, .grid-3, .grid-4, .two-col, .steps { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}