/* ============================================================
   QQMCBridge 官网 — 扩展样式（site.css）
   设计语言对齐模板 main.css：浅色玻璃拟态 + 蓝色/青色强调
   ============================================================ */

/* ── 品牌标识 ─────────────────────────────────────────── */
.brand {
  gap: 10px;
}
.brand-mark {
  display: block;
  flex: 0 0 auto;
  filter: drop-shadow(0 6px 14px rgba(0, 97, 211, .28));
}
.brand-text {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
  white-space: nowrap;
}

/* ── Hero 布局微调 ────────────────────────────────────── */
.hero-layout {
  align-items: center;
}
.hero-copy {
  margin-left: var(--content-offset);
}

/* ── Hero 右侧产品示意 ────────────────────────────────── */
.hero-visual {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding: 8px;
  min-width: 0;
}
.hv-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-soft);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.hv-card-head {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-soft);
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--line);
}
.hv-card-head i {
  font-size: 15px;
  color: var(--accent);
}
.hv-card--mc .hv-card-head i {
  color: #0694a2;
}
.hv-msg {
  font-size: 12.5px;
  line-height: 1.45;
  padding: 6px 10px;
  border-radius: 9px;
  max-width: 92%;
}
.hv-msg--in {
  align-self: flex-start;
  background: var(--accent-soft);
  color: var(--text);
  border-top-left-radius: 3px;
}
.hv-msg--out {
  align-self: flex-end;
  background: linear-gradient(135deg, #0d84ff, #0694a2);
  color: #fff;
  border-top-right-radius: 3px;
}
.hv-card--mc .hv-msg--in {
  background: rgba(6, 148, 162, .12);
}
.hv-card--mc .hv-msg--out {
  background: rgba(13, 23, 38, .78);
}
.hv-bridge {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  color: var(--accent);
  font-size: 18px;
  position: relative;
}
.hv-bridge::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--line-strong), var(--accent), var(--line-strong));
}
.hv-bridge i {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-soft);
}

/* ── 通用区块 ─────────────────────────────────────────── */
.site-section {
  width: var(--content-width);
  margin: 0 auto;
  padding: clamp(72px, 10vw, 120px) 0;
  position: relative;
}
.site-section--alt {
  width: 100%;
  background: linear-gradient(180deg, transparent, rgba(0, 97, 211, .045) 18%, rgba(0, 97, 211, .045) 82%, transparent);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.site-section--alt > * {
  width: var(--content-width);
  margin-inline: auto;
}
.section-head {
  max-width: 720px;
  margin-bottom: clamp(36px, 5vw, 56px);
}
.section-eyebrow {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.08;
  letter-spacing: -.03em;
  font-weight: 800;
  margin-bottom: 14px;
}
.section-desc {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ── 特性卡片 ─────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 20px;
  box-shadow: var(--shadow-soft);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform .24s cubic-bezier(.22, 1, .36, 1), border-color .24s ease, box-shadow .24s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 103, 212, .4);
  box-shadow: 0 22px 44px rgba(8, 26, 54, .12);
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 21px;
  color: #fff;
  background: linear-gradient(135deg, #0d84ff, #0694a2);
  box-shadow: 0 10px 22px rgba(0, 97, 211, .28);
  margin-bottom: 16px;
}
.feature-card:nth-child(even) .feature-icon {
  background: linear-gradient(135deg, #5865f2, #0d84ff);
}
.feature-card h3 {
  font-size: 16.5px;
  font-weight: 800;
  letter-spacing: -.01em;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ── 架构图 ───────────────────────────────────────────── */
.arch-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-bottom: 20px;
}
.arch-node {
  flex: 1 1 0;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 22px;
  text-align: center;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.arch-node--gateway {
  border-color: rgba(0, 103, 212, .45);
  background: linear-gradient(180deg, rgba(0, 97, 211, .07), var(--bg-elevated) 55%);
}
.arch-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 25px;
  color: #fff;
  background: linear-gradient(135deg, #0d84ff, #0694a2);
  box-shadow: 0 12px 26px rgba(0, 97, 211, .3);
  margin-bottom: 16px;
}
.arch-node--gateway .arch-icon {
  background: linear-gradient(135deg, #5865f2, #0d84ff);
}
.arch-node h4 {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 8px;
}
.arch-node p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}
.arch-edge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  flex: 0 0 auto;
  color: var(--accent);
  font-size: 20px;
}
.arch-edge--both {
  color: #0694a2;
}
.arch-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(0, 103, 212, .22);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text);
}
.arch-note i {
  color: var(--accent);
  font-size: 17px;
  margin-top: 2px;
}
.arch-note code {
  background: rgba(255, 255, 255, .7);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 12.5px;
}

/* ── 命令卡片 ─────────────────────────────────────────── */
.commands-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.command-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 18px 20px;
  box-shadow: var(--shadow-soft);
  transition: transform .24s cubic-bezier(.22, 1, .36, 1), border-color .24s ease;
}
.command-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 103, 212, .4);
}
.command-key {
  align-self: flex-start;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #0d84ff, #0694a2);
  border-radius: 8px;
  padding: 4px 10px;
  letter-spacing: -.01em;
}
.command-card p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}

/* ── 部署步骤 ─────────────────────────────────────────── */
.deploy-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}
.deploy-step {
  display: flex;
  gap: 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow-soft);
}
.deploy-num {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, #0d84ff, #0694a2);
  box-shadow: 0 8px 18px rgba(0, 97, 211, .26);
}
.deploy-body h4 {
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 6px;
}
.deploy-body p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}
.deploy-body code {
  background: rgba(255, 255, 255, .7);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 12px;
  color: var(--text);
}

/* ── 下载 CTA ─────────────────────────────────────────── */
.download-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  background: linear-gradient(120deg, rgba(13, 132, 255, .1), rgba(6, 148, 162, .1)), var(--bg-elevated);
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  padding: clamp(26px, 4vw, 40px);
  box-shadow: var(--shadow-soft);
}
.download-cta-copy h3 {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 8px;
}
.download-cta-copy p {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.6;
}
.download-cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── 页脚 ─────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--bg-elevated);
}
.footer-inner {
  width: var(--content-width);
  margin: 0 auto;
  padding: 34px 0 40px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 800;
}
.footer-note {
  font-size: 12.5px;
  color: var(--text-soft);
  line-height: 1.6;
}
.footer-meta {
  font-size: 12px;
  color: var(--text-soft);
  opacity: .72;
}

/* ── 锚点滚动偏移（避免被固定导航遮住）────────────── */
[id] {
  scroll-margin-top: 72px;
}

/* ── 滚动入场动画（模板 JS 自动加 .is-visible）────────── */
.reveal {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition: opacity .7s cubic-bezier(.22, 1, .36, 1), transform .7s cubic-bezier(.22, 1, .36, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateZ(0);
}

/* ── 响应式 ───────────────────────────────────────────── */
@media (max-width: 1100px) {
  .features-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 940px) {
  .hero-layout { grid-template-columns: 1fr; }
  .hero-copy { margin-left: 0; }
  .hero-visual { max-width: 420px; margin: 34px auto 0; }
  .hero-wrap { height: auto; min-height: 100dvh; }
  .hero-wrap .hero.hero-section { padding: calc(var(--nav-height) + 56px) 0 72px; }
  .commands-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .deploy-steps { grid-template-columns: 1fr; }
  .arch-flow { flex-direction: column; gap: 0; }
  .arch-edge { width: 100%; height: 40px; transform: rotate(90deg); }
  .arch-edge--both i { transform: rotate(-90deg); }
}
@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
  .commands-grid { grid-template-columns: 1fr; }
  .site-section { padding: 64px 0; }
  .download-cta { flex-direction: column; align-items: stretch; }
  .download-cta-actions .cta-link { width: 100%; }
}