/* ============ Cards（15.9） ============ */
.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.product-card {
  background: rgba(13, 27, 42, 0.72);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all var(--t-normal) var(--ease);
}
.product-card:hover { transform: translateY(-4px); border-color: var(--border-active); box-shadow: 0 12px 40px rgba(32, 217, 255, 0.08); }
.product-card .p-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  color: var(--p-color);
  background: rgba(22, 119, 255, 0.10);
  border: 1px solid rgba(32, 217, 255, 0.18);
}
.product-card h3 { font-size: 21px; }
.product-card .one-line { color: var(--text-secondary); font-size: 14.5px; }
.product-card .tags { display: flex; flex-wrap: wrap; gap: 8px; }
.product-card .p-foot { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--border-default); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.p-card-cta { font-size: 14px; font-weight: 600; color: var(--p-color); display: inline-flex; align-items: center; gap: 6px; }
.p-card-gh { width: 36px; height: 36px; display: grid; place-items: center; border-radius: var(--radius-btn); color: var(--text-secondary); transition: all var(--t-fast); }
.p-card-gh:hover { color: var(--brand-cyan); background: rgba(32, 217, 255, 0.08); }

/* 场景入口（5.2.05） */
.scene-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.scene-card {
  background: rgba(13, 27, 42, 0.72);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  padding: 26px;
  cursor: pointer;
  transition: all var(--t-normal) var(--ease);
}
.scene-card:hover { border-color: var(--border-active); transform: translateY(-4px); }
.scene-card h3 { font-size: 17px; margin-bottom: 8px; }
.scene-card p { color: var(--text-tertiary); font-size: 14px; }
.scene-card .go { margin-top: 16px; color: var(--brand-cyan); font-size: 14px; font-weight: 600; }

/* 原则（5.2.06）：宣言式顶线列表（与产品卡片的"边框卡片"形态区分） */
.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 48px; max-width: 1000px; margin-inline: auto; }
.principles .pr { background: none; border: 0; border-top: 1px solid var(--border-default); border-radius: 0; padding: 18px 2px 6px; text-align: left; }
.principles .pr b { font-size: 17px; display: block; margin-bottom: 6px; }
.principles .pr b::before { content: ''; display: block; width: 26px; height: 2px; background: var(--gradient-primary); margin-bottom: 12px; border-radius: 2px; }
.principles .pr span { color: var(--text-tertiary); font-size: 14px; }

/* Trust（5.2.07） */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; }
.stat { background: rgba(13, 27, 42, 0.60); border: 1px solid var(--border-default); border-radius: var(--radius-card); padding: 28px 20px; text-align: center; }
.stat b { display: block; font-size: clamp(24px, 3.4vw, 36px); font-weight: 700; letter-spacing: -0.01em; }
.stat span { display: block; color: var(--text-secondary); font-size: 13.5px; margin-top: 4px; }
.stat small { color: var(--text-tertiary); font-size: 12px; display: block; margin-top: 2px; }

/* Updates（5.2.08） */
.update-item { display: flex; align-items: center; gap: 18px; padding: 18px 22px; background: rgba(13, 27, 42, 0.60); border: 1px solid var(--border-default); border-radius: var(--radius-card); margin-bottom: 12px; transition: all var(--t-normal); }
.update-item:hover { border-color: var(--border-active); transform: translateX(4px); }
.update-item time { color: var(--brand-cyan); font-size: 13px; font-weight: 600; white-space: nowrap; }
.update-item span { color: var(--text-primary); }

/* Featured Product（5.2.03） */
.featured { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; background: linear-gradient(160deg, rgba(13, 27, 42, 0.9), rgba(5, 10, 18, 0.4)); border: 1px solid var(--border-default); border-radius: var(--radius-lg); padding: 56px; }
.featured .f-tagline { font-size: 26px; font-weight: 650; margin: 18px 0 14px; white-space: pre-line; }
.featured .f-desc { color: var(--text-secondary); margin-bottom: 26px; }
.featured .f-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.featured .f-visual { aspect-ratio: 4 / 3; border-radius: var(--radius-card); border: 1px solid var(--border-default); background: radial-gradient(400px 260px at 30% 25%, rgba(32, 217, 255, 0.12), transparent 65%), rgba(8, 19, 33, 0.8); display: grid; place-items: center; position: relative; overflow: hidden; }
.featured .f-visual::after { content: ''; position: absolute; inset: 0; background: linear-gradient(rgba(150,190,230,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(150,190,230,.05) 1px, transparent 1px); background-size: 36px 36px; mask-image: radial-gradient(circle at 50% 50%, black, transparent 80%); }

/* 页面通用头部 */
.page-hero { padding: 160px 0 64px; }
.page-hero .h1 { margin: 18px 0 16px; }
.page-hero p { color: var(--text-secondary); max-width: 680px; }

/* 通用引用工具（js 门控：无 JS / 爬虫 / 降级环境下内容直接可见，PRD 17.2）
 * 注意：显隐两条规则必须同为 html.js 前缀——恢复规则优先级必须严格高于隐藏规则 */
html.js [data-reveal] { opacity: 0; transform: translateY(20px); transition: opacity var(--t-reveal) var(--ease), transform var(--t-reveal) var(--ease); }
html.js [data-reveal].revealed { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 0.08s; }
[data-reveal][data-delay="2"] { transition-delay: 0.16s; }


/* ============================================================
 * FAQ
 * ============================================================ */
.faq-list { max-width: 780px; margin-inline: auto; }
.faq-item { background: rgba(13, 27, 42, 0.6); border: 1px solid var(--border-default); border-radius: var(--radius-card); margin-bottom: 12px; overflow: hidden; }
.faq-item summary { list-style: none; cursor: pointer; padding: 18px 24px; font-weight: 600; font-size: 15.5px; display: flex; justify-content: space-between; align-items: center; gap: 16px; min-height: 44px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 22px; color: var(--brand-cyan); transition: transform var(--t-normal) var(--ease); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 24px 18px; color: var(--text-secondary); font-size: 14.5px; }


/* ============================================================
 * 三档 Surface 节奏（评审：打破每屏同色）
 * ============================================================ */
.bg-abyss { background: var(--bg-abyss); }
.bg-deep { background: var(--bg-deep-ocean); }
.bg-elevated { background: var(--bg-elevated); }

/* ============================================================
 * 第 4 轮精修：尺度 / 大场景 / 非对称构图 / 品牌 DNA 贯穿
 * ============================================================ */

/* Section 顶部 Flow Divider（品牌 DNA 贯穿中段） */
.block-divider { position: relative; }
.block-divider::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: min(320px, 40%);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(32,217,255,.30), transparent);
}

/* 左对齐 Section Head（非对称 Editorial） */
.section-head.left { margin-inline: 0; text-align: left; }
.section-head.left .eyebrow { justify-content: flex-start; }

/* Agent 执行流 Demo */
.agent-flow {
  background: rgba(8, 19, 33, 0.92);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 30px;
  position: relative;
  overflow: hidden;
}
.agent-flow::before { content: ''; position: absolute; inset: 0; background: radial-gradient(360px 220px at 20% 0%, rgba(32,217,255,.10), transparent 70%); pointer-events: none; }
.af-node { display: grid; grid-template-columns: 84px 1fr; gap: 16px; align-items: center; padding: 12px 0; position: relative; }
.af-node .af-tag { font-family: var(--font-mono); font-size: 12px; letter-spacing: 2px; font-weight: 700; color: var(--brand-cyan); }
.af-node .af-body { font-size: 14.5px; color: var(--text-secondary); display: flex; align-items: center; }
.af-node .af-body b { color: var(--text-primary); font-weight: 600; }
.af-node .af-body > svg { color: var(--success); flex-shrink: 0; margin-right: 8px; }
.af-node.af-multi .af-body { flex-direction: column; align-items: stretch; gap: 7px; }
.af-node .af-line { display: flex; align-items: center; gap: 8px; color: var(--text-secondary); font-size: 14px; }
.af-node .af-line svg { color: var(--success); flex-shrink: 0; }
.af-node.af-result .af-body { font-size: 15px; }
.af-node.af-result .af-body b { color: var(--success); font-size: 17px; }
.af-node::before { content: ''; position: absolute; left: 42px; top: -8px; bottom: -8px; width: 1px; background: linear-gradient(rgba(32,217,255,.0), rgba(32,217,255,.25), rgba(32,217,255,.0)); }
.af-node:first-child::before { display: none; }
@keyframes af-in { 0%, 100% { opacity: 1; } 50% { opacity: .55; } }
.af-node:nth-child(1) { animation: af-in 3.2s ease-in-out infinite; }
.af-node:nth-child(2) { animation: af-in 3.2s ease-in-out .7s infinite; }
.af-node:nth-child(3) { animation: af-in 3.2s ease-in-out 1.4s infinite; }
.af-node:nth-child(4) { animation: af-in 3.2s ease-in-out 2.1s infinite; }
.af-node:nth-child(5) { animation: af-in 3.2s ease-in-out 2.8s infinite; }



/* 5) 六原则：大号编号 + Typography 驱动 */
.principles { grid-template-columns: repeat(3, 1fr); gap: 18px 56px; max-width: 1080px; }
.principles .pr { border-top: 1px solid var(--border-default); padding: 22px 2px 8px; }
.principles .pr-num { font-family: var(--font-mono); font-size: 34px; font-weight: 700; letter-spacing: 1px; background: var(--gradient-text); -webkit-background-clip: text; background-clip: text; color: transparent; display: block; line-height: 1; }
.principles .pr b { font-size: 19px; margin-top: 12px; }
.principles .pr b::before { display: none; }
.principles .pr span { font-size: 14.5px; }

/* 7) Trust：数字成为最大视觉元素（去卡片化） */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
.stat { background: none; border: 0; border-top: 1px solid var(--border-default); border-radius: 0; padding: 24px 4px 8px; text-align: left; }
.stat b { font-size: clamp(44px, 6vw, 72px); font-weight: 700; letter-spacing: -0.02em; line-height: 1; }
.stat--long b { font-size: clamp(24px, 2.6vw, 34px); letter-spacing: 0.5px; white-space: nowrap; }
.stat span { margin-top: 10px; font-size: 14.5px; color: var(--text-secondary); }
.stat small { margin-top: 2px; font-size: 12px; color: var(--text-tertiary); }

/* 响应式（共享组件） */
@media (max-width: 1024px) {
  .principles { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .principles { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; gap: 24px; }
}