/* ==================== 产品页通用样式 ==================== */
/* 依赖 common.css 的设计系统；本文件只补充产品页专属组件，不重复定义通用类 */

/* ---------- 面包屑 ---------- */
.breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-tertiary); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--brand-deep); }
.breadcrumb .sep { opacity: 0.4; }

/* ---------- 首屏 CTA ---------- */
.prod-cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 32px; }

/* ---------- 数据条（与首页 stats-band 同一语言） ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  background: var(--surface);
  margin: clamp(40px, 5vw, 64px) 0 0;
}
.stat-strip .stat {
  padding: 34px 20px;
  text-align: center;
  position: relative;
}
.stat-strip .stat + .stat::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 36px;
  background: var(--border-soft);
}
.stat-strip .stat-num {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.stat-strip .stat-num small { font-size: 15px; font-weight: 600; margin-left: 3px; }
.stat-strip .stat-label {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-top: 8px;
}

/* ---------- 内容块 ---------- */
.prod-block {
  padding: clamp(56px, 6vw, 88px) 0;
  border-bottom: 1px solid var(--border-soft);
}
.prod-block:last-of-type { border-bottom: none; }
.prod-block-head { margin-bottom: clamp(28px, 3vw, 40px); }
.prod-block-head .section-title { margin-bottom: 12px; }

/* ---------- 优势卡片 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.adv {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: clamp(24px, 2.6vw, 30px);
  box-shadow: var(--shadow-warm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.adv:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--line-strong);
}
.adv-num {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--brand);
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}
.adv h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}
.adv p { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.75; }

/* ---------- 功能特点列表 ---------- */
.feat-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 44px; }
.feat-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
}
.feat-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  opacity: 0.5;
}
.feat-list li strong { color: var(--text); font-weight: 600; margin-right: 6px; }

/* ---------- 应用场景标签 ---------- */
.scene-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.scene-tag {
  font-size: var(--fs-sm);
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text-secondary);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.scene-tag:hover {
  border-color: var(--brand-line);
  color: var(--brand-deep);
  background: var(--brand-soft);
}

/* ---------- 文档卡片 ---------- */
.doc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.doc-link {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}
.doc-link:hover {
  transform: translateY(-2px);
  border-color: var(--brand-line);
  box-shadow: var(--shadow-card);
}
.doc-link .t {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.doc-link .t::after {
  content: '\2197';
  font-size: 12px;
  color: var(--brand);
  opacity: 0.6;
}
.doc-link .d { font-size: var(--fs-xs); color: var(--text-tertiary); line-height: 1.6; }

/* ---------- 底部行动区（与首页 CTA 同一深色语言） ---------- */
.prod-cta-band {
  margin-top: clamp(56px, 6vw, 80px);
  padding: clamp(44px, 5vw, 64px) clamp(24px, 4vw, 48px);
  text-align: center;
  border-radius: var(--r-xl);
  background: linear-gradient(160deg, #16233A 0%, #0F172A 100%);
  color: #fff;
}
.prod-cta-band h2 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}
.prod-cta-band p { font-size: 15px; color: rgba(255, 255, 255, 0.6); margin-bottom: 26px; }
.prod-cta-band .btn-primary { background: #fff; color: var(--ink); box-shadow: none; }
.prod-cta-band .btn-primary:hover { background: #F1F5F9; }
.prod-cta-band .btn-secondary,
.prod-cta-band .btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
}
.prod-cta-band .btn-secondary:hover,
.prod-cta-band .btn-ghost:hover { background: rgba(255, 255, 255, 0.14); color: #fff; }

/* ---------- 同系列产品导航 ---------- */
.sibling-nav { margin-top: clamp(48px, 5vw, 64px); padding-top: 40px; border-top: 1px solid var(--border-soft); }
.sibling-nav h4 {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.sibling-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.sibling-list a {
  display: block;
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border-soft);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.sibling-list a:hover { border-color: var(--brand-line); color: var(--brand-deep); }
.sibling-list a.current {
  border-color: var(--brand-line);
  color: var(--brand-deep);
  font-weight: 500;
  background: var(--brand-soft);
}

/* ---------- 产品卡片网格（云通信总览页） ---------- */
.prod-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.prod-cards .prod-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: clamp(24px, 2.6vw, 30px);
  box-shadow: var(--shadow-warm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.prod-cards .prod-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-line);
  box-shadow: var(--shadow-card);
}
.prod-cards .prod-card .tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--brand);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.prod-cards .prod-card h3 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.prod-cards .prod-card p { font-size: var(--fs-sm); color: var(--text-secondary); line-height: 1.75; flex: 1; }
.prod-cards .prod-card .more {
  margin-top: 20px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--brand-deep);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.25s var(--ease);
}
.prod-cards .prod-card:hover .more { gap: 10px; }
.prod-cards .prod-card-wide { grid-column: span 2; }

/* ---------- 资源入口条 ---------- */
.res-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.res-card {
  display: block;
  padding: 24px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  background: var(--surface);
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s var(--ease);
}
.res-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand-line);
  box-shadow: var(--shadow-card);
}
.res-card h4 { font-size: 16px; font-weight: 600; color: var(--text); margin-bottom: 8px; }
.res-card p { font-size: var(--fs-xs); color: var(--text-tertiary); line-height: 1.6; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
  .stat-strip .stat:nth-child(3)::before { display: none; }
  .adv-grid { grid-template-columns: 1fr; }
  .feat-list { grid-template-columns: 1fr; }
  .doc-grid { grid-template-columns: 1fr; }
  .sibling-list { grid-template-columns: repeat(2, 1fr); }
  .prod-cards { grid-template-columns: repeat(2, 1fr); }
  .prod-cards .prod-card-wide { grid-column: span 2; }
  .res-row { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .stat-strip .stat { padding: 26px 12px; }
  .stat-strip .stat:nth-child(odd)::before { display: none; }
  .sibling-list { grid-template-columns: 1fr; }
  .prod-cards { grid-template-columns: 1fr; }
  .prod-cards .prod-card-wide { grid-column: span 1; }
}