:root {
  --bg: #0b1020;
  --surface: #121830;
  --card: #121a38;
  --border: #233055;
  --text: #e8ecf8;
  --muted: #a9b3cf;
  --primary: #5b8cff;
  --primary-600: #4479ff;
  --secondary: #22d3ee;
  --accent: #7c3aed;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  padding-top: 64px;
  color: var(--text);
  background: radial-gradient(1200px 800px at 80% -20%, rgba(124, 58, 237, 0.2), transparent),
              radial-gradient(800px 600px at -10% 20%, rgba(34, 211, 238, 0.18), transparent),
              var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Helvetica Neue, Arial, Noto Sans, sans-serif, Apple Color Emoji, Segoe UI Emoji;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; 
  padding: 12px 18px; border-radius: 10px; border: 1px solid transparent; cursor: pointer; 
  background: var(--surface); color: var(--text); transition: transform .15s ease, background .2s ease, border-color .2s ease; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: var(--shadow); }
.btn-secondary { background: linear-gradient(135deg, var(--secondary), var(--primary)); box-shadow: var(--shadow); }
.btn-outline { background: transparent; border-color: var(--border); }
.btn-link { background: transparent; color: var(--muted); }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  backdrop-filter: blur(10px);
  background: rgba(11, 16, 32, 0.6);
  border-bottom: 1px solid rgba(35, 48, 85, 0.6);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.logo { width: 28px; height: 28px; }
.nav { display: flex; gap: 20px; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--text); }
.header-cta { display: flex; gap: 8px; align-items: center; }
.hamburger { display: none; background: transparent; border: none; padding: 8px; cursor: pointer; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); margin: 4px 0; border-radius: 2px; }

.hero { padding: 64px 0 40px; }
.hero-inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; }
.hero h1 { font-size: 44px; line-height: 1.15; margin: 0 0 12px; }
.subtitle { color: var(--muted); font-size: 18px; }
.hero-actions { margin-top: 20px; display: flex; gap: 12px; }
.hero-trust { margin-top: 18px; color: var(--muted); display: flex; align-items: center; gap: 10px; }
.hero-trust ul { display: flex; gap: 12px; padding: 0; margin: 0; list-style: none; }

.mockup { background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02)); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); }
.mockup-header { padding: 12px 14px; background: rgba(18, 26, 56, 0.8); border-bottom: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.mockup-body { padding: 16px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.kpi { background: rgba(18, 26, 56, 0.6); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.kpi-label { color: var(--muted); font-size: 12px; }
.kpi-value { font-size: 22px; font-weight: 700; margin-top: 6px; }
.chart { 
  height: 160px;
  min-height: 160px;
  grid-column: 1 / -1;
  border-radius: 10px;
  background: rgba(18, 26, 56, 0.6);
  border: 1px solid var(--border);
  padding: 0;
  position: relative;
  overflow: hidden;
}

.chart svg {
  pointer-events: auto;
}

/* 图表动画初始状态 */
.chart svg circle {
  opacity: 0;
  transform: scale(0);
}

.chart svg text {
  opacity: 0;
  transform: translateY(10px);
  max-width: 40px;
  font-size: 9px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chart svg path[stroke="var(--primary)"] {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
}

.chart svg path[fill="url(#chartGradient)"] {
  opacity: 0;
}

/* 加载指示器 */
.chart-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  z-index: 10;
}

.loading-spinner {
  width: 20px;
  height: 20px;
    height: auto;
    min-height: 120px;
  border-top: 2px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  width: 100%;
  height: 100%;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.chart-loading.hidden {
  display: none;
}

.chart-title {
  position: absolute;
  top: 8px;
  left: 12px;
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  z-index: 10;
}

.data-point {
  cursor: pointer;
  transition: r 0.2s ease;
}

.data-point:hover {
  r: 6;
}



.section { padding: 64px 0; }
.section h2 { font-size: 32px; margin: 0 0 24px; }
.cards { display: grid; gap: 16px; }
.two-col { grid-template-columns: repeat(2, 1fr); }
.three-col { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; box-shadow: var(--shadow); }
.card h3 { margin: 8px 0 8px; }
.card h4 { margin: 12px 0 6px; font-size: 14px; color: var(--text); font-weight: 600; }
.list { margin: 12px 0; padding-left: 18px; color: var(--muted); }
.list.small { font-size: 14px; }
.pain-points { margin-bottom: 16px; }
.pain-points .list li { color: var(--muted); }
.benefits { margin-bottom: 16px; }
.benefits .list li { color: var(--muted); }
.feature .icon { font-size: 22px; }

.steps { background: linear-gradient(180deg, rgba(91, 140, 255, 0.05), rgba(124, 58, 237, 0.06)); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.steps-list { counter-reset: step; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 0; margin: 0; list-style: none; }
.steps-list li { background: var(--card); border: 1px solid var(--border); padding: 18px; border-radius: 14px; box-shadow: var(--shadow); }
.step-num { display: inline-block; font-weight: 700; color: var(--secondary); margin-bottom: 6px; }

.cases .metric { font-size: 14px; color: var(--muted); }
.cases .metric .num { font-size: 22px; font-weight: 800; color: var(--text); }

.pricing .price { position: relative; }
.price-tag { font-size: 22px; font-weight: 800; margin: 6px 0 8px; }
.price .badge { position: absolute; top: -10px; right: 14px; background: var(--warning); color: #111827; font-size: 12px; padding: 4px 8px; border-radius: 999px; font-weight: 700; }
.price.highlight { border-color: rgba(91, 140, 255, 0.6); box-shadow: 0 10px 30px rgba(91, 140, 255, 0.25); }

.accordion { display: grid; gap: 10px; }
.accordion-item { background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.accordion-header { width: 100%; text-align: left; padding: 14px; background: transparent; color: var(--text); border: none; cursor: pointer; font-size: 16px; }
.accordion-panel { display: none; padding: 0 14px 14px; color: var(--muted); }
.accordion-item.active .accordion-panel { display: block; }

.cta { border-top: 1px solid var(--border); }
.cta-inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 20px; align-items: center; }
.cta-form { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); }
.cta-form h3 { margin: 0 0 10px; }
.cta-form label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); margin: 10px 0; }
.cta-form input, .cta-form select { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: #0c1328; color: var(--text); }
.form-tip { color: var(--muted); font-size: 12px; }

.site-footer { padding: 24px 0; border-top: 1px solid var(--border); color: var(--muted); }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; gap: 20px; align-items: center; }
.footer-nav { display: flex; gap: 14px; }
.footer-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.divider { opacity: 0.4; }

/* 客服悬浮按钮与弹窗 */
/* 联系我们二维码样式 */
.kefu-hint { color: var(--muted); font-size: 13px; margin: 0 0 10px; }
.cta-form img { 
  width: 100%; 
  max-width: 280px; 
  height: auto; 
  aspect-ratio: 1 / 1; 
  object-fit: contain;
  border-radius: 12px; 
  border: 1px solid var(--border); 
  background: #fff; 
  margin: 0 auto;
  display: block;
}

@media (max-width: 980px) {
  .hero-inner, .cta-inner { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: repeat(2, 1fr); }
  .steps-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .three-col { grid-template-columns: 1fr; }
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: rgba(11,16,32,0.98); padding: 14px 20px; border-bottom: 1px solid var(--border); }
  .nav.open { display: grid; gap: 10px; }
  .hamburger { display: inline-block; }
  .header-cta { display: none; }
}