/* ==========================================================================
   拓客云建站 (TOPLEAD) 商业化设计系统规范 (v2.1)
   对标 Stripe / FS.COM 工业极简标准
   严防折行畸变、强制 white-space 规范、高信噪比排版
   ========================================================================== */

:root {
  --primary: #0a4699;           /* 工业深蓝 */
  --primary-hover: #083777;
  --primary-light: #f0f5ff;
  --primary-border: #adc6ff;
  
  --dark: #0f172a;              /* 标题深炭黑 */
  --text-main: #1e293b;         /* 正文主色 */
  --text-muted: #64748b;        /* 辅助说明灰 */
  --text-sub: #94a3b8;          /* 次级弱化灰 */

  --bg-page: #f8fafc;           /* 浅灰页面底色 */
  --bg-white: #ffffff;
  --bg-subtle: #f1f5f9;
  
  --border-subtle: #e2e8f0;     /* 1px 精细分界线 */
  --border-strong: #cbd5e1;

  --success: #15803d;           /* 成功绿 */
  --success-bg: #f0fdf4;
  --success-border: #bbf7d0;

  --danger: #b91c1c;            /* 警示红 */
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;

  --warning: #b45309;           /* 提醒橙 */
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --max-width: 1240px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 顶部公告条 */
.top-announcement {
  background: var(--dark);
  color: #e2e8f0;
  font-size: 12px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.top-announcement .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-announcement a {
  color: #60a5fa;
  font-weight: 500;
  white-space: nowrap;
}
.top-announcement a:hover {
  text-decoration: underline;
}

/* 商业级导航栏 (强抗折行优化) */
.navbar {
  background: #ffffff;
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}
.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}
.brand-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  white-space: nowrap;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: -0.5px;
  white-space: nowrap;
}
.brand-logo span {
  white-space: nowrap;
}
.brand-badge {
  font-size: 11px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-border);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 20px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-menu li {
  white-space: nowrap;
}
.nav-menu a {
  color: var(--text-muted);
  transition: color 0.15s;
  padding: 6px 0;
  position: relative;
  white-space: nowrap;
  display: inline-block;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
}
.nav-menu a.active::after {
  content: "";
  position: absolute;
  bottom: -15px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  white-space: nowrap;
}

/* 容器规范 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  gap: 6px;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 1px 2px rgba(10, 70, 153, 0.2);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}
.btn-secondary {
  background-color: #ffffff;
  color: var(--dark);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--text-muted);
}
.btn-outline-primary {
  background-color: #ffffff;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline-primary:hover {
  background-color: var(--primary-light);
}
.btn-danger {
  background-color: var(--danger);
  color: #fff;
}
.btn-danger:hover {
  background-color: #991b1b;
}
.btn-lg {
  padding: 12px 24px;
  font-size: 15px;
}

/* 徽章 Badge */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  line-height: 1.3;
  white-space: nowrap;
}
.tag-blue { background: var(--primary-light); color: var(--primary); border: 1px solid var(--primary-border); }
.tag-green { background: var(--success-bg); color: var(--success); border: 1px solid var(--success-border); }
.tag-orange { background: var(--warning-bg); color: var(--warning); border: 1px solid var(--warning-border); }
.tag-gray { background: var(--bg-subtle); color: var(--text-muted); border: 1px solid var(--border-subtle); }

/* 版块布局 */
.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-subtle);
  background: #ffffff;
}
.section-alt {
  background: var(--bg-page);
}
.section-dark {
  background: var(--dark);
  color: #ffffff;
}
.section-header {
  margin-bottom: 40px;
}
.section-header.text-center {
  text-align: center;
}
.section-pretitle {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  margin-bottom: 8px;
}
.section-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.3;
  letter-spacing: -0.6px;
  margin-bottom: 12px;
}
.section-dark .section-title {
  color: #ffffff;
}
.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.6;
}
.section-dark .section-subtitle {
  color: #94a3b8;
}

/* 网格系统 */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* 商业卡片 Card */
.b-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.b-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

/* 信任背书与指标栏 (Stats Bar) */
.stats-strip {
  background: #ffffff;
  border-bottom: 1px solid var(--border-subtle);
  padding: 28px 0;
}
.stat-item {
  text-align: center;
  border-right: 1px solid var(--border-subtle);
}
.stat-item:last-child {
  border-right: none;
}
.stat-number {
  font-size: 30px;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.1;
  font-family: var(--font-mono);
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* 行业产业带标签居中平衡排列 */
.industry-strip {
  padding: 16px 0;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 13px;
}
.industry-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
}
.industry-pill {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

/* 工业级标准参数对比表 (FS.COM 风格) */
.data-table-wrapper {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}
.data-table th {
  background: var(--bg-subtle);
  color: var(--dark);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
}
.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  color: var(--text-main);
  vertical-align: top;
}
.data-table tr:last-child td {
  border-bottom: none;
}
.data-table th:last-child, .data-table td:last-child {
  border-right: none;
}
.data-table .col-weak {
  background: #fffafa;
  color: var(--text-muted);
}
.data-table .col-highlight {
  background: #f8fbff;
  border-left: 2px solid var(--primary);
}

/* 定价套餐卡片 */
.pricing-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary), var(--shadow-lg);
}
.pricing-badge-popular {
  position: absolute;
  top: -11px;
  right: 20px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.5px;
}
.pricing-title {
  font-size: 19px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 6px;
}
.pricing-desc {
  font-size: 13px;
  color: var(--text-muted);
  min-height: 40px;
}
.pricing-price {
  margin: 20px 0 16px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.price-symbol { font-size: 18px; font-weight: 700; color: var(--dark); }
.price-num { font-size: 34px; font-weight: 800; color: var(--dark); font-family: var(--font-mono); }
.price-period { font-size: 13px; color: var(--text-muted); }
.pricing-features {
  list-style: none;
  margin-bottom: 24px;
  flex-grow: 1;
}
.pricing-features li {
  font-size: 13px;
  color: var(--text-main);
  padding: 8px 0;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}
.pricing-features li::before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
}

/* 控制台图表模拟器 */
.console-box {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.console-topbar {
  background: var(--bg-subtle);
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.console-dots {
  display: flex;
  gap: 5px;
}
.console-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #cbd5e1;
}
.console-content {
  padding: 18px;
}

/* FAQ */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.faq-item {
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  padding: 20px;
  border-radius: var(--radius-md);
}
.faq-question {
  font-size: 15px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.faq-question::before {
  content: "Q";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 4px;
  font-size: 11px;
}
.faq-answer {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 移动端留资条 */
.mobile-action-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
  padding: 10px 16px;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
  z-index: 999;
}
.mobile-action-bar-inner {
  display: flex;
  gap: 12px;
}
.btn-mobile-call {
  flex: 1;
  background: var(--danger);
  color: #fff;
  padding: 11px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-align: center;
}
.btn-mobile-wx {
  flex: 1;
  background: #07c160;
  color: #fff;
  padding: 11px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-align: center;
}

/* 页脚 */
.site-footer {
  background: var(--dark);
  color: #94a3b8;
  font-size: 13px;
  padding: 50px 0 25px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.site-footer a {
  color: #cbd5e1;
}
.site-footer a:hover {
  color: #ffffff;
}
.footer-col h5 {
  color: #ffffff;
  font-size: 14px;
  margin-bottom: 14px;
  font-weight: 700;
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 8px;
}
.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 响应式断点 */
@media (max-width: 1100px) {
  .nav-menu { gap: 14px; font-size: 13px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border-subtle); padding: 14px 0; }
  .stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); }
  .navbar .container { height: auto; padding: 12px 20px; flex-direction: column; gap: 10px; }
  .nav-menu { flex-wrap: wrap; justify-content: center; gap: 14px; }
}

@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
  .section-title { font-size: 22px; }
  .mobile-action-bar { display: block; }
  body { padding-bottom: 60px; }
}

/* ========================================================
   案例对比与浏览器真实截图展示组件
   ======================================================== */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
@media (max-width: 980px) {
  .compare-grid { grid-template-columns: 1fr; }
}

.compare-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}
.compare-card.danger {
  border-color: #fecaca;
  background: #ffffff;
}
.compare-card.success {
  border-color: #bbf7d0;
  box-shadow: 0 10px 25px -5px rgba(22, 101, 52, 0.08), 0 8px 10px -6px rgba(22, 101, 52, 0.04);
}

.compare-header {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-alt);
}
.compare-card.danger .compare-header {
  background: #fef2f2;
  border-bottom-color: #fee2e2;
}
.compare-card.success .compare-header {
  background: #f0fdf4;
  border-bottom-color: #dcfce7;
}

.browser-mockup {
  border-bottom: 1px solid var(--border-subtle);
  background: #0f172a;
}
.browser-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  background: #1e293b;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.browser-dots {
  display: flex;
  gap: 6px;
}
.browser-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.browser-address {
  flex: 1;
  background: #0f172a;
  color: #94a3b8;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.browser-body {
  position: relative;
  background: #000;
  overflow: hidden;
  max-height: 420px;
}
.browser-body img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  object-position: top;
  transition: transform 0.3s ease;
}
.browser-body:hover img {
  transform: translateY(-8%);
}
.browser-tag {
  position: absolute;
  bottom: 12px;
  right: 12px;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
}
.browser-tag.danger {
  background: rgba(220, 38, 38, 0.9);
  color: #fff;
}
.browser-tag.success {
  background: rgba(22, 101, 52, 0.95);
  color: #fff;
}

.compare-analysis {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.point-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.point-list li {
  font-size: 13.5px;
  line-height: 1.6;
  padding-left: 20px;
  position: relative;
  color: var(--text-muted);
}
.point-list li strong {
  color: var(--text-main);
}
.point-list.danger li::before {
  content: "✕";
  position: absolute;
  left: 0;
  top: 1px;
  color: var(--danger);
  font-weight: 800;
  font-size: 12px;
}
.point-list.success li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 1px;
  color: var(--success);
  font-weight: 800;
  font-size: 13px;
}

.gallery-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}
.gallery-img-box {
  background: #0f172a;
  border-bottom: 1px solid var(--border-subtle);
  max-height: 320px;
  overflow: hidden;
}
.gallery-img-box img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  object-position: top;
}
.gallery-info {
  padding: 20px;
  flex: 1;
}