/* 通用适配与键盘访问 */
html { scroll-padding-top: 84px; }
.desktop-nav { display: none; }
/* 仅显示原 Logo 左侧图形，名称由文字呈现 */
.brand-logo { display: block; width: 40px; height: auto; aspect-ratio: 465 / 390; flex-shrink: 0; overflow: hidden; }
.brand-name { font-size: 18px; font-weight: 800; line-height: 1.3; white-space: nowrap; }
.hero-actions { min-width: 0; }
.cap-grid > *, .cases > *, .testi-grid > *, .wecan-grid > * { min-width: 0; }
a:focus-visible { outline: 3px solid var(--primary); outline-offset: 5px; }
.testi-foot { flex-wrap: wrap; }
.dl-card { min-width: 0; }
.dl-card h4 { flex-wrap: wrap; }
.cap-heading { min-width: 0; }
.cap-card-new { border-color: rgba(47,107,255,0.25); }
.cap-card-new::before { background: var(--primary); }
.cap-card-new .cap-icon { color: var(--primary); background: #edf3ff; }
.cap-card-new .cap-sub, .cap-card-new .cap-title { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.cap-new-label { padding: 2px 7px; border-radius: 5px; background: #edf3ff; font-size: 11px; font-weight: 600; }
.cap-free-label { padding: 4px 10px; border-radius: 6px; background: var(--primary); color: #fff; font-size: 14px; line-height: 1.5; white-space: nowrap; }

/* 手机保持单列，避免旧断点在窄容器内挤成两列 */
@media (max-width: 767px) {
  .wecan-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 359px) {
  h1 { font-size: 28px; }
  .cap-feature { padding: 10px 8px; gap: 6px; font-size: 14px; }
  .cap-header { gap: 10px; }
  .cap-title { font-size: 19px; }
  .case-top { flex-wrap: wrap; gap: 8px; }
}

/* 平板与小型电脑：扩展容器，使用两列内容 */
@media (min-width: 768px) {
  .container { max-width: 1240px; padding-inline: 32px; }
  .nav { height: 72px; gap: 24px; }
  .brand { flex-shrink: 0; font-size: 19px; }
  .brand-logo { width: 48px; }
  .brand-name { font-size: 22px; }
  .desktop-nav { display: flex; align-items: center; gap: 24px; }
  .desktop-nav a { color: var(--text-secondary); text-decoration: none; font-size: 14px; }
  .desktop-nav a:hover { color: var(--primary); }
  section { margin-bottom: 64px; }
  .hero { padding: 56px 0 40px; }
  h1 { font-size: 42px; line-height: 1.25; }
  .hero-sub { max-width: 580px; margin-inline: auto; font-size: 17px; }
  .hero-visual { max-width: 460px; width: 100%; margin-inline: auto; }
  .stats { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; margin-bottom: 64px; }
  .stat-card { padding: 24px 16px; }
  .stat-num { font-size: 30px; }
  .section-head { margin-bottom: 32px; }
  h2 { font-size: 30px; }
  .section-desc { max-width: 740px; margin-inline: auto; line-height: 1.8; }
  .cap-grid { display: grid; gap: 24px; }
  .cap-card { margin-bottom: 0; padding: 28px; }
  .cap-features { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .wecan-grid, .cases, .testi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .wecan-card, .case-card, .testi-card { display: flex; flex-direction: column; }
  .wecan-steps, .testi-foot { margin-top: auto; }
  .case-top { flex-wrap: wrap; gap: 8px; }
  .case-exposure { margin-top: auto; margin-bottom: 0; flex-wrap: wrap; }
  .platform-grid { grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 14px; }
  .path-list { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
  .path-item { padding: 24px 12px; }
  .dl-flow { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .dl-item { padding-bottom: 0; min-width: 0; }
  .dl-line { display: none; }
  .cta { padding: 40px 32px; }
  .cta h3 { font-size: 28px; }
}

/* 电脑首屏：左侧介绍，右侧产品示意 */
@media (min-width: 1024px) {
  .cap-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cap-card { display: flex; flex-direction: column; padding: 24px; }
  .cap-header { min-height: 80px; }
  .cap-features { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: 18px; }
  .cap-platforms { margin-top: auto; }
  .hero {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    column-gap: 36px;
    align-content: center;
    min-height: 460px;
    padding-block: 64px;
    text-align: left;
  }
  .hero > .badge { grid-column: 1; grid-row: 1; justify-self: start; }
  .hero > h1 { grid-column: 1; grid-row: 2; font-size: clamp(38px, 3.6vw, 46px); }
  .hero-sub { grid-column: 1; grid-row: 3; margin: 0 0 28px; }
  .hero-actions { grid-column: 1; grid-row: 4; }
  .hero-visual { grid-column: 2; grid-row: 1 / 5; align-self: center; height: 270px; margin: 0; }
  .phone-1, .phone-3 { width: 132px; height: 170px; top: 65px; }
  .phone-1 { left: 0; }
  .phone-3 { right: 0; }
  .phone-2 { width: 150px; height: 190px; top: 25px; }
  .phone-card svg { width: 42px; height: 42px; }
  .phone-card span { font-size: 14px; }
}

/* 大屏电脑：三列卡片与横向投放流程 */
@media (min-width: 1200px) {
  .wecan-grid, .cases, .testi-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cap-card { padding: 24px; display: flex; flex-direction: column; }
  .cap-header { gap: 12px; min-height: 80px; }
  .cap-icon { width: 50px; height: 50px; }
  .cap-title { font-size: 20px; }
  .cap-desc { min-height: 120px; }
  .cap-features { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: 18px; }
  .cap-feature { padding: 12px 10px; gap: 7px; font-size: 14px; }
  .cap-platforms { margin-top: auto; min-height: 132px; }
  .case-title { min-height: 50px; }
  .dl-flow { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
  .dl-item { flex-direction: column; }
  .dl-rail { width: 100%; align-items: flex-start; }
  .dl-line {
    display: block;
    top: 27px; bottom: auto; left: 54px;
    width: calc(100% - 34px); height: 2px;
    transform: none;
    background: var(--primary);
  }
  .dl-card { justify-content: flex-start; padding: 20px; }
  .dl-card h4 { flex-direction: column; gap: 10px; }
}

/* 首屏概览：四种投放方式使用统一的文字卡片 */
.hero .hero-panel {
  height: auto;
  padding: 22px;
  background: #fff;
  border: 1px solid #dce5f2;
  border-radius: 18px;
  box-shadow: 0 12px 32px rgba(20, 40, 80, 0.06);
  text-align: left;
}
.hero-panel-kicker { margin: 0 0 6px; color: var(--primary); font-size: 12px; font-weight: 600; }
.hero-panel h2 { font-size: 21px; margin-bottom: 20px; }
.hero-option-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.hero-option-grid a { display: flex; flex-direction: column; gap: 4px; padding: 13px; border-radius: 10px; background: #f7f9fc; border: 1px solid #e5ebf3; text-decoration: none; color: var(--text); }
.hero-option-grid a:hover { border-color: var(--primary); background: #f0f5ff; }
.hero-option-grid strong { font-size: 15px; }
.hero-option-grid span:last-child { color: var(--text-secondary); font-size: 12px; }
.hero-option-index { color: var(--primary); font-size: 12px; font-weight: 700; }
.hero-panel-note { margin: 16px 0 0; color: var(--text-secondary); font-size: 12px; line-height: 1.7; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px 24px; align-items: center; justify-content: center; }
.hero-text-link { color: var(--primary); font-size: 14px; text-decoration: underline; text-underline-offset: 5px; }
.cap-title[id] { scroll-margin-top: 20px; }

/* 投放方式对照：桌面表格，手机按方式逐项阅读 */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.mode-table-wrap { border: 1px solid #dce5f2; border-radius: 16px; overflow: hidden; background: #fff; }
.mode-table { width: 100%; border-collapse: collapse; table-layout: fixed; text-align: left; font-size: 14px; line-height: 1.7; }
.mode-table thead { background: #eef3fa; }
.mode-table th, .mode-table td { padding: 20px; vertical-align: top; overflow-wrap: anywhere; }
.mode-table thead th:first-child { width: 20%; }
.mode-table tbody tr + tr { border-top: 1px solid #e5ebf3; }
.mode-table tbody td { color: var(--text-secondary); }
.mode-table tbody th a { color: var(--primary); text-decoration: none; }
.mode-table tbody th a:hover { text-decoration: underline; }
.mode-table tbody th span { display: block; margin-top: 5px; font-size: 12px; font-weight: 400; color: var(--text-secondary); }
.section-footnote { margin: 14px 4px 0; color: var(--text-secondary); font-size: 12px; line-height: 1.8; }

/* 广告样式展示保留完整图片，不裁切广告按钮和文案 */
.ad-preview-grid { display: grid; gap: 20px; }
.ad-preview-card { min-width: 0; background: #fff; border: 1px solid #dce5f2; border-radius: 16px; overflow: hidden; }
.ad-preview-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 18px 20px; border-bottom: 1px solid #e5ebf3; font-size: 15px; font-weight: 700; }
.ad-example-label { font-size: 11px; color: var(--text-secondary); font-weight: 400; background: #f3f5f8; padding: 4px 8px; border-radius: 4px; }
.ad-preview-card figure { margin: 0; padding: 16px; background: #f7f9fc; }
.ad-preview-card figure img { display: block; width: 100%; height: auto; border: 1px solid #e5ebf3; border-radius: 8px; }
.ad-preview-card figcaption { margin-top: 10px; color: var(--text-secondary); font-size: 11px; line-height: 1.6; }
.ad-preview-body { padding: 20px; }
.ad-preview-body h3 { font-size: 17px; margin: 0 0 16px; line-height: 1.6; }
.ad-preview-body dl { margin: 0; }
.ad-preview-body dl > div { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 12px; margin-top: 12px; font-size: 13px; line-height: 1.7; }
.ad-preview-body dt { color: var(--text-secondary); }
.ad-preview-body dd { margin: 0; }
.ad-placement-note { margin-top: 20px; padding: 20px 24px; background: #fff; border-left: 3px solid var(--primary); border-radius: 0 10px 10px 0; }
.ad-placement-note h3 { font-size: 15px; margin: 0 0 8px; }
.ad-placement-note p { margin: 0; font-size: 13px; color: var(--text-secondary); line-height: 1.8; }

/* 常见问题使用原生折叠控件，支持键盘访问 */
.faq-list { max-width: 900px; margin-inline: auto; display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid #dce5f2; border-radius: 12px; }
.faq-item summary { list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary svg { width: 20px; height: 20px; flex-shrink: 0; color: var(--text-secondary); }
.faq-item[open] summary { color: var(--primary); }
.faq-item[open] summary svg { transform: rotate(45deg); color: var(--primary); }
.faq-item summary:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; border-radius: 10px; }
.faq-answer { padding: 0 24px 22px; }
.faq-answer p { margin: 0; max-width: 780px; font-size: 14px; line-height: 1.9; color: var(--text-secondary); }
.faq-answer > * + * { margin-top: 12px; }
.faq-answer > p + p { margin-top: 12px; }
.faq-answer ul { padding-left: 22px; margin-bottom: 0; font-size: 14px; line-height: 1.9; color: var(--text-secondary); }
.faq-answer li + li { margin-top: 8px; }
.faq-answer blockquote { margin-right: 0; margin-bottom: 0; margin-left: 0; padding: 12px 16px; border-left: 3px solid var(--primary); background: #f3f6fb; }

@media (max-width: 767px) {
  #mode-guide h2, #ad-preview h2, #faq h2 { line-height: 1.45; }
  #mode-guide h2 .highlight, #ad-preview h2 .highlight, #faq h2 .highlight { display: inline-block; }
  .mode-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .mode-table, .mode-table tbody, .mode-table tr { display: block; width: 100%; }
  .mode-table tbody tr { padding: 18px; }
  .mode-table tbody th { display: block; padding: 0 0 14px; font-size: 17px; }
  .mode-table td { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 12px; padding: 7px 0; font-size: 13px; }
  .mode-table td::before { content: attr(data-label); color: var(--text); font-weight: 600; }
  .faq-item summary { padding: 18px; font-size: 15px; }
  .faq-answer { padding: 0 18px 18px; }
}
@media (min-width: 768px) {
  .ad-preview-card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .ad-preview-head { grid-column: 1 / -1; }
  .ad-preview-body { padding: 18px; }
  .ad-preview-body dl > div { grid-template-columns: minmax(0, 1fr); gap: 3px; }
  .desktop-nav { gap: 18px; }
}
@media (min-width: 1024px) {
  .hero-actions { justify-content: flex-start; }
  .hero .hero-panel { padding: 26px; }
  .ad-preview-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ad-preview-card { display: block; }
  .ad-preview-body dl > div { grid-template-columns: 56px minmax(0, 1fr); gap: 12px; }
}
@media (max-width: 359px) {
  .hero .hero-panel { padding: 16px; }
  .hero-option-grid a { padding: 10px; }
  .hero-option-grid strong { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orb { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}