/* =====================================================================
 * 公共布局与组件
 * ===================================================================== */

/* 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: none;
}
.topbar-inner {
  max-width: 1560px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--text);
  font-size: 20px;
  letter-spacing: 0;
}
.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--accent-grad);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 18px;
}
.brand-sub {
  color: var(--dim);
  font-size: 12px;
  margin-left: 4px;
  font-weight: 400;
}
.nav {
  display: flex;
  gap: 4px;
  margin-left: 8px;
  flex-wrap: nowrap;
}
.nav a {
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--sub);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  height: 32px;
  box-sizing: border-box;
}
.nav a:hover { background: var(--chip); text-decoration: none; }
.nav a.active {
  color: var(--accent);
  background: var(--chip);
  font-weight: 700;
}
.nav-login {
  margin-left: auto;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}
.nav-login:hover { background: var(--chip); }

/* 返回遮罩页按钮（由 app.js 在所有页面的顶栏统一注入；index.html 也有内联版本） */
.intro-back-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 32px; padding: 0 14px; line-height: 1;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-2); color: var(--sub);
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  cursor: pointer; white-space: nowrap;
  font-family: var(--sans, 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  transition: background .15s, color .15s, border-color .15s, transform .15s;
}
.intro-back-btn span { display: inline-flex; align-items: center; line-height: 1; }
.intro-back-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-1px); }

.nav-signup:hover {
  background: rgba(99, 179, 237, 0.12);
  color: #0e4a87;
  border-color: rgba(59, 130, 246, 0.85);
}
:root[data-theme="dark"] .nav-signup {
  color: #93c5fd;
  border-color: rgba(147, 197, 253, 0.55);
}
:root[data-theme="dark"] .nav-signup:hover {
  background: rgba(99, 179, 237, 0.18);
  color: #dbeafe;
  border-color: rgba(147, 197, 253, 0.85);
}
.theme-toggle {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  background: var(--chip);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* 页头股票搜索框（免责声明右侧，全站通用） */
.topbar-search { position: relative; display: flex; align-items: center; margin-left: auto; align-self: center; flex: 0 0 auto; }
.topbar-search-input { box-sizing: border-box; height: 32px; width: 168px; flex: 0 0 168px; min-width: 168px; border: 1px solid var(--border); border-radius: 16px; background: var(--card); color: var(--text); font-size: 13px; padding: 0 38px 0 14px; outline: none; transition: border-color .15s; }
.topbar-search-input::placeholder { color: var(--dim); }
.topbar-search-input:focus { border-color: var(--accent); }
.topbar-search-btn { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); width: 26px; height: 26px; border: none; background: transparent; color: var(--sub); cursor: pointer; font-size: 14px; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
.topbar-search-btn:hover { color: var(--accent); }
.topbar-search-panel { position: absolute; top: 40px; right: 0; min-width: 240px; max-height: 320px; overflow-y: auto; background: var(--card); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 8px 24px var(--scrim); z-index: 220; display: none; }
.topbar-search-panel.show { display: block; }
.topbar-search-item { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 9px 12px; cursor: pointer; border-bottom: 1px solid var(--border); }
.topbar-search-item:last-child { border-bottom: none; }
.topbar-search-item:hover { background: var(--chip); }
.topbar-search-item .nm { font-size: 13px; color: var(--text); font-weight: 600; }
.topbar-search-item .cd { font-size: 12px; color: var(--dim); font-family: monospace; }
.topbar-search-item .mk { font-size: 11px; color: var(--sub); }
.topbar-search-empty { padding: 12px; font-size: 13px; color: var(--dim); }
@media (max-width: 720px) {
  .topbar-search { margin-left: 8px; }
  .topbar-search-input { width: 120px; flex: 0 0 120px; min-width: 120px; }
}

/* 主容器 */
.container {
  max-width: 1560px;
  margin: 0 auto;
  padding: 40px;
}

/* 区块标题 */
.sec-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 56px 0 24px;
}
.sec-title .bar {
  width: 3px;
  height: 18px;
  background: var(--accent);
  border-radius: 2px;
}
.sec-title .t {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.sec-title .s {
  font-size: 13px;
  color: var(--sub);
  margin-left: auto;
}

/* 功能中心页统一页头（大标题 + 副标题，无竖条） */
.page-hero {
  padding: 28px 0 14px;
}
.page-hero h1 {
  margin: 0;
  font-size: 34px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}
.page-hero .sub {
  color: var(--sub);
  font-size: 14px;
  margin-top: 6px;
  line-height: 1.65;
}
@media (max-width: 600px) {
  .page-hero { padding: 22px 0 10px; }
  .page-hero h1 { font-size: 24px; }
}

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
  margin-bottom: 28px;
  box-shadow: var(--shadow);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  transition: all 0.15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary {
  background: var(--ink);
  color: var(--ink-inv);
  border: 1px solid var(--ink);
}
.btn-primary:hover { background: var(--card); color: var(--accent); border-color: var(--accent); }
.btn-ghost { background: var(--chip); }

/* chip */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  background: var(--chip);
  color: var(--text);
  border: 1px solid var(--border);
  margin: 2px;
  cursor: pointer;
  transition: all 0.15s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { color: var(--accent); border-color: var(--accent); }

/* input */
input[type="text"], input[type="number"], textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font-family: var(--serif);
  font-size: 14px;
  outline: none;
  transition: border 0.15s;
}
input:focus, textarea:focus { border-color: var(--accent); }
input::placeholder { color: var(--dim); }

/* 异动预警输入框：与首页搜索框同一行（输入+按钮并排），长度保持一致 */
.watch-input { display: flex; align-items: center; gap: 8px; }
.watch-input input { flex: 1 1 auto; width: auto; min-width: 0; }
.watch-input .btn { flex: 0 0 auto; }

/* 搜索栏外框：与首页 .search-wrap 完全一致（max-width 720px 居中），保证全站搜索栏等宽 */
.search-wrap { max-width: 720px; margin: 0 auto; }
.search-wrap .search input { font-size: 15px; padding: 12px 4px; }

/* 搜索栏 */
.search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 8px 6px 18px;
}
.search input {
  border: none;
  background: transparent;
  flex: 1;
  padding: 8px 4px;
}
.search input:focus { border: none; }
.search button {
  background: var(--ink);
  color: var(--ink-inv);
  border: 1px solid var(--ink);
  border-radius: var(--r-pill);
  padding: 7px 18px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.search button:hover { background: var(--card); color: var(--accent); border-color: var(--accent); }
.suggest {
  margin-top: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-height: 240px;
  overflow-y: auto;
}
.suggest-item {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}
.suggest-item:last-child { border-bottom: none; }
.suggest-item:hover { background: var(--chip); }
.suggest-item .n { color: var(--text); font-weight: 600; }
.suggest-item .c { color: var(--dim); font-family: var(--mono); font-size: 13px; }

/* 标签 */
.tag {
  display: inline-flex;
  padding: 2px 10px;
  border-radius: 6px;
  font-size: 12px;
  margin: 2px;
}
.tag.up { color: var(--up); background: rgba(208, 2, 27, 0.1); }
.tag.down { color: var(--down); background: rgba(0, 135, 90, 0.1); }
.tag.mid { color: var(--accent-2); background: rgba(200, 135, 26, 0.12); }

/* 提示 */
.disc-sm {
  color: var(--dim);
  font-size: 12px;
  line-height: 1.65;
  margin-top: 18px;
  padding: 12px 0;
}

/* 弹层 */
.modal-mask {
  position: fixed;
  inset: 0;
  background: var(--scrim);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal {
  background: var(--card);
  border-radius: 14px;
  padding: 24px;
  max-width: 600px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 12px 40px var(--scrim);
}
.modal h3 { margin: 0 0 16px; font-size: 18px; }
.modal .bar {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.modal .bar .btn { flex: 1; }

/* 空状态 */
.empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--sub);
}
.empty .ic {
  font-size: 48px;
  opacity: 0.6;
  margin-bottom: 12px;
}

/* 加载 */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--sub);
}
.spinner {
  display: inline-block;
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 响应式 */
@media (max-width: 768px) {
  .topbar-inner { padding: 10px 16px; gap: 12px; }
  .container { padding: 16px; }
  .brand-sub { display: none; }
  .nav { font-size: 13px; }
  .nav a { padding: 5px 9px; }
  .card { padding: 14px; }
}

/* 表格 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
}
table th, table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
table th { color: var(--sub); font-weight: 600; background: var(--card-2); }

/* 进度条 */
.progress {
  height: 6px;
  background: var(--bg-2);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s;
}

/* =====================================================================
 * 投资者教育 / 知识库 组件（edu.html 及 edu-*.html 专题页共用）
 * ===================================================================== */
.edu-hero {
  display: flex; gap: 22px; align-items: center;
  background: linear-gradient(135deg, var(--card) 0%, color-mix(in srgb, var(--card) 96%, var(--accent)) 100%);
  border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 28px 26px; margin: 14px 0 8px; box-shadow: var(--shadow);
}
.edu-hero .eh-ic {
  width: 72px; height: 72px; flex: 0 0 72px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0ea5e9, #2563eb);
  border-radius: 20px; box-shadow: 0 10px 24px rgba(14, 165, 233, .30);
}
.edu-hero .eh-ic-chan { background: linear-gradient(135deg, #E24B4A, #C62828); box-shadow: 0 10px 24px rgba(224, 75, 74, .30); }
.edu-hero .eh-ic-pattern { background: linear-gradient(135deg, #F59E0B, #D97706); box-shadow: 0 10px 24px rgba(245, 158, 11, .30); }
.edu-hero .eh-ic-value { background: linear-gradient(135deg, #10B981, #059669); box-shadow: 0 10px 24px rgba(16, 185, 129, .30); }
.edu-hero .eh-ic-temp { background: linear-gradient(135deg, #F97316, #EA580C); box-shadow: 0 10px 24px rgba(249, 115, 22, .30); }
.edu-hero .eh-ic svg { width: 36px; height: 36px; color: #fff; }
.edu-hero .eh-t { font-size: 24px; font-weight: 800; color: var(--text); margin-bottom: 6px; letter-spacing: -0.02em; }
.edu-hero .eh-one { font-size: 14px; color: var(--accent); font-weight: 700; line-height: 1.6; }
.edu-hero .eh-sub { font-size: 13px; color: var(--sub); line-height: 1.7; margin-top: 8px; }

.topic-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin: 22px 0; }
.topic-card {
  display: flex; flex-direction: column; text-decoration: none; position: relative;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 26px; box-shadow: var(--shadow); transition: all .22s cubic-bezier(0.22,1,0.36,1);
  overflow: hidden;
}
.topic-card::before {
  content: attr(data-no);
  position: absolute; top: 16px; right: 18px;
  font-family: var(--serif); font-size: 13px; font-weight: 800;
  color: var(--dim); opacity: .35; letter-spacing: .04em;
}
.topic-card:hover {
  border-color: var(--accent); transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(224, 52, 42, .10), 0 4px 12px rgba(0,0,0,.04);
  text-decoration: none;
}
.topic-card:hover .tc-ic-wrap { transform: translateY(-3px) scale(1.05); }
.topic-card:hover .tc-more .pill { background: var(--accent); color: #fff; border-color: var(--accent); }
.topic-card .tc-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.topic-card .tc-ic-wrap {
  width: 52px; height: 52px; flex: 0 0 52px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 16px; color: #fff;
  box-shadow: 0 8px 20px rgba(0,0,0,.14);
  transition: transform .22s cubic-bezier(0.22,1,0.36,1);
}
.topic-card .tc-ic-wrap svg { width: 26px; height: 26px; }
.topic-card .tc-ic-chan { background: linear-gradient(135deg, #E24B4A, #C62828); }
.topic-card .tc-ic-pattern { background: linear-gradient(135deg, #F59E0B, #D97706); }
.topic-card .tc-ic-value { background: linear-gradient(135deg, #10B981, #059669); }
.topic-card .tc-ic-temp { background: linear-gradient(135deg, #F97316, #EA580C); }
.topic-card .tc-title { display: flex; flex-direction: column; }
.topic-card .tc-t { font-size: 18px; font-weight: 800; color: var(--text); letter-spacing: -0.02em; }
.topic-card .tc-tag { font-size: 10px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--dim); margin-top: 3px; }
.topic-card .tc-one { font-size: 14px; color: var(--text); font-weight: 700; line-height: 1.55; margin-bottom: 12px; }
.topic-card .tc-list { list-style: none; padding: 0; margin: 0 0 auto; color: var(--sub); font-size: 13px; line-height: 1.75; }
.topic-card .tc-list li { position: relative; padding-left: 16px; margin: 5px 0; }
.topic-card .tc-list li::before {
  content: '';
  position: absolute; left: 0; top: 9px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); opacity: .65;
}
.topic-card .tc-more { margin-top: 18px; }
.topic-card .tc-more .pill {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 7px 14px; border-radius: 999px;
  font-size: 12px; font-weight: 700; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  transition: all .15s ease;
}
.topic-card .tc-more .pill svg { width: 12px; height: 12px; }
@media (max-width: 760px) { .topic-grid { grid-template-columns: 1fr; } .edu-hero { flex-direction: column; text-align: center; } }

.concept-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; margin: 16px 0; }
.concept {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: 18px 18px 20px; box-shadow: var(--shadow); transition: all .18s ease;
}
.concept:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(0,0,0,.06); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.concept .c-chart {
  height: 130px; margin: -6px -6px 14px; padding: 10px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg) 70%, transparent), transparent);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
}
.concept .c-chart svg { width: 100%; height: 100%; max-width: 260px; overflow: visible; }
.concept .c-chart svg polyline.chan-line { stroke-dasharray: 400; stroke-dashoffset: 400; }
.concept .c-chart svg rect.chan-kline { transform-box: fill-box; transform-origin: bottom center; transform: scaleY(0); }
.concept .c-chart svg rect.chan-macd { transform-box: fill-box; transform-origin: bottom center; transform: scaleY(0); }
.concept .c-chart svg circle.chan-node { opacity: 0; transform-box: fill-box; transform-origin: center; transform: scale(0); }
.concept .c-chart svg rect.chan-zhongshu { opacity: 0; transform-box: fill-box; transform-origin: center; transform: scale(0.85); }
.concept .c-chart svg text.chan-label { opacity: 0; }
/* 进入视口时触发动画 */
.concept.in-view .c-chart svg polyline.chan-line { animation: chanDraw 1.6s cubic-bezier(0.22,1,0.36,1) both; }
.concept.in-view .c-chart svg rect.chan-kline { animation: chanGrow 0.5s cubic-bezier(0.22,1,0.36,1) both; }
.concept.in-view .c-chart svg rect.chan-macd { animation: chanGrow 0.4s ease-out both; }
.concept.in-view .c-chart svg circle.chan-node { animation: chanPop 0.35s cubic-bezier(0.34,1.56,0.64,1) both; }
.concept.in-view .c-chart svg rect.chan-zhongshu { animation: chanFade 0.6s ease-out both; }
.concept.in-view .c-chart svg text.chan-label { animation: chanFade 0.5s ease-out both; }
@keyframes chanDraw { to { stroke-dashoffset: 0; } }
@keyframes chanGrow { to { transform: scaleY(1); } }
@keyframes chanPop { to { opacity: 1; transform: scale(1); } }
@keyframes chanFade { to { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) {
  .concept .c-chart svg polyline.chan-line,
  .concept .c-chart svg rect.chan-kline,
  .concept .c-chart svg rect.chan-macd,
  .concept .c-chart svg circle.chan-node,
  .concept .c-chart svg rect.chan-zhongshu,
  .concept .c-chart svg text.chan-label { animation: none !important; stroke-dashoffset: 0 !important; transform: none !important; opacity: 1 !important; }
}
.concept .c-term { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.concept .c-desc { font-size: 13px; color: var(--sub); line-height: 1.75; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 12px 0; }
.steps li {
  position: relative; padding: 10px 0 10px 46px; border-bottom: 1px dashed var(--border);
  color: var(--sub); font-size: 13px; line-height: 1.75;
}
.steps li:last-child { border-bottom: none; }
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 8px; width: 28px; height: 28px;
  background: var(--accent-grad); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px;
}
.steps li b { color: var(--text); }

.callout { border-radius: 8px; padding: 12px 14px; margin: 12px 0; font-size: 13px; line-height: 1.75; color: var(--sub); }
.callout b { color: var(--text); }
.callout.tip { background: rgba(200, 135, 26, 0.1); border-left: 3px solid var(--accent-2); }
.callout.warn { background: rgba(245, 70, 45, 0.08); border-left: 3px solid var(--accent); }
.callout.info { background: var(--chip); border-left: 3px solid var(--accent); }

.pill {
  display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; background: var(--chip); color: var(--sub);
  border: 1px solid var(--border); margin: 2px 4px 2px 0;
}
.pill.up { color: var(--up); border-color: rgba(208, 2, 27, .3); background: rgba(208, 2, 27, .08); }
.pill.down { color: var(--down); border-color: rgba(0, 135, 90, .3); background: rgba(0, 135, 90, .08); }
.pill.mid { color: var(--accent-2); border-color: rgba(200, 135, 26, .3); background: rgba(200, 135, 26, .1); }

.src-note { font-size: 12px; color: var(--dim); line-height: 1.6; margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--border); }
.back-link { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 4px; }
.back-link:hover { text-decoration: none; color: var(--accent); }

/* 缠论结构图 三级别切换 */
.lv-tabs { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; }
.lv-tab { font-size: 13px; padding: 6px 16px; border-radius: 7px; cursor: pointer; border: 1px solid var(--border); color: var(--sub); background: var(--bg-2); transition: all .15s; user-select: none; }
.lv-tab:hover { color: var(--text); border-color: var(--accent); }
.lv-tab.on { color: #fff; background: var(--accent); border-color: var(--accent); font-weight: 700; }
.lv-panel img { width: 100%; height: auto; display: block; border-radius: 8px; cursor: zoom-in; }
/* =====================================================================
 * 响应式：<720px 移动端适配
 * ===================================================================== */
.nav-toggle { display: none; }
@media (max-width: 720px) {
  .topbar-inner { gap: 8px; padding: 10px 14px; flex-wrap: wrap; }
  .brand { font-size: 16px; }
  .brand-sub { display: none; }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 32px; height: 32px; border: 1px solid var(--border); border-radius: 8px;
    background: var(--chip); color: var(--text); cursor: pointer; font-size: 18px;
    order: 3; margin-left: auto;
  }
  .nav-toggle.on { background: var(--accent); color: #fff; border-color: var(--accent); }
  .nav {
    display: none; flex-basis: 100%; order: 5;
    flex-direction: column; gap: 0; margin-left: 0;
    overflow: visible; padding-top: 6px;
  }
  .nav.on { display: flex; }
  .nav a { width: 100%; height: 36px; padding: 0 14px; border-radius: 6px; }
  .topbar-search { order: 4; flex: 1; }
  /* 表格横滚容器 */
  .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table-scroll table { min-width: 600px; }
  /* 卡片网格降列 */
  .feature-grid, .fw-grid { grid-template-columns: 1fr 1fr !important; }
  .idx-grid { grid-template-columns: 1fr 1fr !important; }
  .w-grid { grid-template-columns: 1fr 1fr 1fr !important; }
  .pos-summary { grid-template-columns: 1fr 1fr !important; padding: 10px; }
  .pos-card { grid-template-columns: 1fr !important; }
  .pos-card .p-pl { text-align: left; }
  /* 研究中心 6 框单行改 2×3 */
  .feature-grid { grid-template-columns: repeat(2, 1fr) !important; }
  /* 单列泛卡片 */
  .idx-price-row, .framework-card, .alert { width: 100% !important; }
  /* 弹窗全屏 */
  .modal { max-width: 92vw; }
}
@media (max-width: 420px) {
  .topbar-inner { padding: 8px 10px; gap: 6px; }
  .brand { font-size: 15px; }
  .topbar-search input { font-size: 13px; padding: 6px 8px; }
}

/* =====================================================================
 * 宽屏增强：容器加宽到 1560 后，在 ≥1600 视口让内容型网格增列，
 * 避免大屏下两列卡片过宽、留白空旷；同时再加一点呼吸感。
 * ===================================================================== */
@media (min-width: 1600px) {
  .container { padding: 44px; }
  .topic-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .concept-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 22px; }
  .sec-title { margin: 60px 0 26px; }
  .card { padding: 30px; }
}