/* ===== 全局变量 — 品牌色（基于鼎峯云 logo：山峰蓝 + 山峰紫） ===== */
:root {
  --primary:        #2C7BE5;      /* 品牌主蓝（logo 山峰蓝） */
  --primary-dark:   #1E5FB8;
  --primary-light:  #4F95EE;
  --secondary:      #7B5CF6;      /* 品牌紫（logo 山峰紫） */
  --secondary-dark: #5B3FD3;
  --accent:         #06b6d4;      /* 辅助青 */
  --accent-warm:    #f59e0b;      /* 辅助橙金 */

  /* 背景：整体淡蓝紫色调，避免大白 */
  --bg:             #eef2fb;
  --bg-soft:        #f4f6fc;
  --bg-section:     #e7eefa;
  --bg-section-2:   #efe9fb;      /* 偏紫淡底 */
  --bg-card:        #ffffff;
  --bg-card-alt:    #f7f9fe;

  --text:           #0f172a;
  --text-dark:      #1e293b;
  --text-muted:     #64748b;
  --border:         #dbe3f1;
  --border-soft:    #e8edf7;

  /* 渐变 */
  --gradient:       linear-gradient(135deg, #2C7BE5 0%, #7B5CF6 100%);
  --gradient-soft:  linear-gradient(135deg, rgba(44,123,229,.08) 0%, rgba(123,92,246,.08) 100%);
  --gradient-mesh:  radial-gradient(at 20% 10%, rgba(44,123,229,.10) 0, transparent 50%),
                    radial-gradient(at 80% 0%,  rgba(123,92,246,.10) 0, transparent 55%),
                    radial-gradient(at 70% 90%, rgba(6,182,212,.06)  0, transparent 50%);

  --shadow-sm: 0 2px 8px rgba(44,123,229,.06);
  --shadow-md: 0 8px 24px rgba(44,123,229,.10);
  --shadow-lg: 0 16px 40px rgba(44,123,229,.14);
}
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC','Microsoft YaHei','sans-serif';
  background: var(--bg);
  background-image: var(--gradient-mesh);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* ===== 顶部品牌色装饰条 ===== */
.brand-stripe {
  position: fixed; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg,#2C7BE5 0%, #5E7BFA 35%, #7B5CF6 65%, #06b6d4 100%);
  z-index: 1100;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 3px; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; height: 68px;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
  transition: background .3s, box-shadow .3s;
}
.navbar.scrolled { background: rgba(255,255,255,.96); box-shadow: 0 2px 16px rgba(44,123,229,.08); }
.logo { display: flex; align-items: center; gap: 12px; }
.logo img { height: 36px; }
.logo-text { font-size: 17px; font-weight: 700; letter-spacing: 1px; }
.logo-text .en { font-size: 11px; color: var(--text-muted); font-weight: 400; letter-spacing: 3px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 15px; color: var(--text-dark);
  transition: color .2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -6px; left: 0; right: 0;
  height: 2px; background: var(--gradient); border-radius: 2px;
}
.nav-cta {
  padding: 8px 20px; border-radius: 6px;
  background: var(--gradient); color: #fff !important;
  font-size: 14px; font-weight: 600;
  box-shadow: 0 4px 12px rgba(44,123,229,.25);
  transition: opacity .2s, transform .2s, box-shadow .2s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(123,92,246,.35); }

/* ===== 通用布局 ===== */
.section { padding: 100px 5%; position: relative; }
.section-sm { padding: 60px 5%; position: relative; }
.container { max-width: 1200px; margin: 0 auto; position: relative; z-index: 1; }
.section-tag {
  display: inline-block;
  padding: 5px 16px; border-radius: 20px;
  background: linear-gradient(135deg, rgba(44,123,229,.10), rgba(123,92,246,.10));
  border: 1px solid rgba(44,123,229,.18);
  font-size: 13px; color: var(--primary); font-weight: 600; margin-bottom: 16px;
  letter-spacing: .5px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px); font-weight: 800;
  line-height: 1.2; margin-bottom: 16px; color: var(--text);
}
.section-title span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.section-desc { color: var(--text-muted); font-size: 16px; max-width: 600px; }

/* 山峰背景装饰（呼应 logo） */
.section-mountain {
  background-color: var(--bg-section);
  background-image:
    linear-gradient(135deg, rgba(44,123,229,.06), rgba(123,92,246,.06)),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 200' preserveAspectRatio='none'><polygon points='0,200 200,60 400,200' fill='%232C7BE5' opacity='0.06'/><polygon points='300,200 500,40 700,200' fill='%237B5CF6' opacity='0.06'/><polygon points='600,200 800,80 1000,200' fill='%232C7BE5' opacity='0.06'/><polygon points='900,200 1100,50 1300,200' fill='%237B5CF6' opacity='0.06'/></svg>");
  background-size: auto, 100% 200px;
  background-position: top, bottom;
  background-repeat: no-repeat, no-repeat;
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px; padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .3s, border-color .3s, box-shadow .3s;
  position: relative; overflow: hidden;
}
.card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background: var(--gradient); opacity: 0; transition: opacity .3s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(44,123,229,.28);
  box-shadow: var(--shadow-lg);
}
.card:hover::before { opacity: 1; }
.card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--gradient); display: flex; align-items: center;
  justify-content: center; font-size: 22px; margin-bottom: 16px;
  box-shadow: 0 6px 16px rgba(44,123,229,.25);
}
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--text-muted); font-size: 14px; line-height: 1.7; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 8px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all .2s; border: none;
}
.btn-primary {
  background: var(--gradient); color: #fff;
  box-shadow: 0 6px 18px rgba(44,123,229,.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(123,92,246,.4); }
.btn-outline {
  background: rgba(255,255,255,.7);
  color: var(--primary);
  border: 1px solid rgba(44,123,229,.3);
  backdrop-filter: blur(6px);
}
.btn-outline:hover { border-color: var(--primary); background: rgba(44,123,229,.08); }

/* ===== 栅格 ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 32px; }

/* ===== 统计数字 ===== */
.stat-card {
  text-align: center; padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  transition: transform .3s, box-shadow .3s, border-color .3s;
  position: relative; overflow: hidden;
}
.stat-card::after {
  content:''; position:absolute; left:0; bottom:0; height:3px; width:100%;
  background: var(--gradient); transform: scaleX(0); transform-origin: left;
  transition: transform .35s;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(44,123,229,.25); }
.stat-card:hover::after { transform: scaleX(1); }
.stat-num {
  font-size: 44px; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { color: var(--text-muted); font-size: 14px; margin-top: 4px; }

/* ===== 分隔线 ===== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(44,123,229,.2), rgba(123,92,246,.2), transparent);
  margin: 0 5%;
}

/* ===== 页脚 ===== */
.footer {
  background: linear-gradient(180deg, #f3f5fb 0%, #eaeefa 100%);
  border-top: 2px solid transparent;
  border-image: var(--gradient) 1;
  padding: 56px 5% 24px;
  position: relative;
}
.footer::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background: var(--gradient);
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr; gap: 32px;
  margin-bottom: 32px;
  align-items: start;
}
.footer-brand p { color: var(--text-muted); font-size: 14px; line-height: 1.8; margin-top: 12px; }
.footer-col h4 {
  font-size: 14px; font-weight: 700; color: var(--text-dark);
  margin-bottom: 16px; padding-bottom: 8px;
  border-bottom: 2px solid;
  border-image: var(--gradient) 1;
  display: inline-block;
}
.footer-col a { display: block; color: var(--text-muted); font-size: 13px; margin-bottom: 10px; transition: color .2s, transform .2s; }
.footer-col a:hover { color: var(--primary); transform: translateX(2px); }
.footer-qr { text-align: center; }
.footer-qr img { width: 100px; height: 100px; border: 1px solid var(--border); border-radius: 10px; padding: 4px; background: #fff; }
.footer-qr-label { font-size: 11px; color: var(--text-muted); margin-top: 6px; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 20px; border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); transition: color .2s; }
.footer-bottom a:hover { color: var(--primary); }

/* ===== 标签 ===== */
.tag {
  display: inline-block; padding: 3px 10px; border-radius: 4px;
  font-size: 12px;
  background: linear-gradient(135deg, rgba(44,123,229,.10), rgba(123,92,246,.10));
  color: var(--primary); margin: 3px;
  border: 1px solid rgba(44,123,229,.12);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 600px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 70px 4%; }
  .navbar { padding: 0 18px; }
}