/* ============================================================
   布局：顶栏、导航、侧栏、各类栅格
   ============================================================ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 0 26px;
  height: 64px;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(14px) saturate(1.1);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  flex: none;
}
.brand:hover { text-decoration: none; }
.seal {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--cinnabar);
  color: #FBEFE4;
  font-family: var(--font-classic);
  font-size: 1.18rem;
  border-radius: 6px;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .18);
  transform: rotate(-2deg);
}
.brand-text { display: flex; align-items: baseline; gap: 8px; }
.brand-text b {
  font-family: var(--font-classic);
  font-size: 1.3rem;
  letter-spacing: .08em;
  font-weight: 600;
}
.brand-text em {
  font-style: normal;
  font-size: .72rem;
  color: var(--muted);
  letter-spacing: .32em;
  font-family: var(--font-ui);
}

.topnav {
  display: flex;
  gap: 4px;
  margin-left: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  font-family: var(--font-ui);
  font-size: .92rem;
  color: var(--ink-2);
  padding: 7px 12px;
  border-radius: 6px;
  white-space: nowrap;
  text-decoration: none;
  transition: background .15s, color .15s;
}
.topnav a:hover { background: var(--paper-3); color: var(--ink); text-decoration: none; }
.topnav a.active { color: var(--cinnabar); background: rgba(166, 58, 46, .08); }

.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.dev-link {
  font-family: var(--font-ui);
  font-size: .78rem;
  color: var(--muted);
  padding: 4px 8px;
  border-radius: 5px;
}
.dev-link:hover { color: var(--ink); background: var(--paper-3); text-decoration: none; }
.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink-2);
  font-size: 1rem;
  cursor: pointer;
  line-height: 1;
}
.theme-btn:hover { border-color: var(--cinnabar); color: var(--cinnabar); }

/* ------------------------------------------------------------------ 主体 */
.app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 30px 26px 80px;
  outline: none;
  min-height: calc(100vh - 64px);
}

.layout-side {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}
.layout-plain .content {
  max-width: 1040px;
  margin: 0 auto;
}
.content { min-width: 0; }
.content.wide { max-width: 1180px; }

/* ------------------------------------------------------------------ 侧栏 */
.side-nav {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-right: 8px;
  border-right: 1px solid var(--line-soft);
  scrollbar-width: thin;
}
.side-head { margin-bottom: 14px; }
.side-head a {
  font-family: var(--font-ui);
  font-size: .84rem;
  color: var(--muted);
}
.nav-group { margin-bottom: 18px; }
.nav-group h4 {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--muted);
  margin: 0 0 6px;
  padding-left: 2px;
}
.nav-group h4 em {
  font-style: normal;
  margin-left: auto;
  font-size: .7rem;
  color: var(--muted);
  opacity: .8;
}
.jing-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cinnabar); display: inline-block; }
.nav-item {
  display: block;
  font-size: .92rem;
  color: var(--ink-2);
  padding: 5px 10px;
  border-radius: 5px;
  border-left: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-item:hover { background: var(--paper-3); text-decoration: none; color: var(--ink); }
.nav-item.active {
  color: var(--cinnabar);
  background: rgba(166, 58, 46, .07);
  border-left-color: var(--cinnabar);
  font-weight: 600;
}

/* ------------------------------------------------------------------ 页头 */
.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.page-title h1 {
  margin: 6px 0 4px;
  font-family: var(--font-classic);
  font-size: 2.1rem;
  letter-spacing: .04em;
}
.page-title h1 small {
  font-size: .9rem;
  color: var(--muted);
  font-family: var(--font-ui);
  font-weight: 400;
  letter-spacing: 0;
}
.page-title p { margin: 0; }
.page-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.eyebrow {
  font-family: var(--font-ui);
  font-size: .74rem;
  letter-spacing: .28em;
  color: var(--muted);
  text-transform: uppercase;
  margin: 0 0 4px;
}

.jing-badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: .72rem;
  letter-spacing: .18em;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid currentColor;
  color: var(--cinnabar);
  vertical-align: middle;
}
.jing-badge.jing-taiyang { color: #A63A2E; }
.jing-badge.jing-yangming { color: #9A7434; }
.jing-badge.jing-shaoyang { color: #3E7C74; }
.jing-badge.jing-taiyin { color: #8A7B4A; }
.jing-badge.jing-shaoyin { color: #4A6FA5; }
.jing-badge.jing-jueyin { color: #7E5A86; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin: 40px 0 14px;
}
.section-head h2 { margin: 0; font-family: var(--font-classic); letter-spacing: .06em; }
.section-head p { margin: 0; }

.sub-block { margin-top: 26px; }
.sub-title {
  font-family: var(--font-ui);
  font-size: .8rem;
  letter-spacing: .2em;
  color: var(--muted);
  margin: 0 0 10px;
  padding-left: 2px;
}

/* 窄屏下拉：默认隐藏，≤860 显示 */
select.formula-select { display: none; }

/* ------------------------------------------------------------------ 栅格 */
.jing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.learn-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: 22px;
  align-items: start;
}
.clinic-grid {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.mode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.compare-summary {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}
.review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}
.review-grid aside { display: grid; gap: 16px; }

/* ------------------------------------------------------------------ 响应 */
@media (max-width: 1100px) {
  .jing-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mode-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .visual-grid { grid-template-columns: 1fr; }
  .visual-side { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
  .review-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .topbar { gap: 12px; padding: 0 14px; height: 56px; }
  .brand-text em { display: none; }
  .brand-text b { font-size: 1.1rem; }
  .topnav { gap: 0; }
  .topnav a { font-size: .84rem; padding: 6px 8px; }
  .app { padding: 20px 14px 60px; }
  .layout-side { grid-template-columns: 1fr; gap: 16px; }
  .side-nav { display: none; }
  select.formula-select {
    display: block;
    font-family: var(--font-ui);
    font-size: .86rem;
    padding: 6px 10px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: var(--paper-2);
    color: var(--ink);
    max-width: 190px;
  }
  .nav-group { margin: 0; min-width: 130px; }
  .visual-side { grid-template-columns: 1fr; }
  .clinic-grid { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .compare-summary { grid-template-columns: 1fr; }
  .jing-grid, .learn-grid, .case-grid, .mode-grid { grid-template-columns: 1fr; }
  .page-title h1 { font-size: 1.7rem; }
  .page-head { align-items: flex-start; }
  .topbar-right .dev-link { display: none; }
}

@media (max-width: 520px) {
  .topnav a { padding: 6px 6px; font-size: .8rem; }
  .brand-text { display: none; }
}