/* 四虎 · 海岸车影独立杂志
   原创静态站样式；无字体、框架或第三方样式依赖。 */

:root {
  color-scheme: light;
  --paper: #f4f1e9;
  --blue: #173e4a;
  --coral: #f17556;
  --gray: #d6dbd7;
  --ink: #173e4a;
  --muted: #53666a;
  --white: #fffdf8;
  --line: rgba(23, 62, 74, .2);
  --blue-line: rgba(244, 241, 233, .25);
  --gutter: clamp(20px, 4vw, 64px);
  --radius: 5px;
  --wide: 1280px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 112px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.8 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}
body:has(dialog[open]) { overflow: hidden; }
main { display: block; overflow: clip; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
h1, h2, h3, h4 { font-weight: 750; line-height: 1.3; }
h1, h2, h3, h4, a, button { overflow-wrap: anywhere; }
ul, ol { margin: 0; padding-left: 1.4em; }
img, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; text-underline-offset: .25em; }
button, input, select, textarea { font: inherit; color: inherit; }
button, select { cursor: pointer; }
button { border: 0; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
button:disabled { opacity: .48; cursor: not-allowed; }
button, .button { touch-action: manipulation; }
input, select, textarea { min-width: 0; border-radius: var(--radius); }
input::placeholder, textarea::placeholder { color: #667577; opacity: 1; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 5px; }
::selection { background: var(--coral); color: var(--blue); }
[hidden], [data-build-noise] { display: none !important; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  z-index: 200;
  top: 12px;
  left: 20px;
  padding: 12px 20px;
  transform: translateY(-180%);
  background: var(--blue);
  color: var(--white);
  border-radius: var(--radius);
}
.skip-link:focus { transform: translateY(0); }
.container { width: min(var(--wide), calc(100% - var(--gutter) * 2)); margin-inline: auto; }
.section { position: relative; padding-block: clamp(64px, 7vw, 104px); }
.section-light, .section-paper { background: var(--paper); color: var(--blue); }
.section-light { background: var(--white); }
.section-blue { background: var(--blue); color: var(--paper); }
.section + .section-paper { border-top: 1px solid var(--line); }
.section-blue + .section-paper { border-top: 0; }
.eyebrow, .kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  font-size: 14px;
  font-weight: 650;
  line-height: 1.6;
  letter-spacing: .12em;
}
.eyebrow::before, .kicker::before {
  content: "";
  flex: 0 0 22px;
  height: 2px;
  background: var(--coral);
}

/* 顶部：长中文品牌与桌面导航。 */
.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 241, 233, .96);
  backdrop-filter: blur(16px);
}
.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 26px;
  width: min(var(--wide), calc(100% - var(--gutter) * 2));
  min-height: 92px;
  margin-inline: auto;
}
.brandmark { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-icon { width: 48px; height: 48px; object-fit: contain; flex: 0 0 48px; }
.brandmark > span { display: block; min-width: 0; }
.brandname { display: block; font-size: 21px; font-weight: 850; line-height: 1.35; letter-spacing: .04em; }
.brandcaption { display: block; margin-top: 3px; color: var(--muted); font-size: 14px; line-height: 1.45; }
.primary-nav { display: flex; align-items: center; justify-content: flex-end; gap: 22px; flex: 1; }
.primary-nav > a { position: relative; padding-block: 15px; font-size: 14px; font-weight: 650; white-space: nowrap; }
.primary-nav > a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 7px;
  height: 2px;
  background: var(--coral);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}
.primary-nav > a:hover::after,
.primary-nav > a:focus-visible::after,
.primary-nav > a[aria-current="page"]::after { transform: scaleX(1); }
.nav-join {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 17px;
  border: 1px solid var(--blue);
  border-radius: 3px;
  background: var(--blue);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  transition: background .2s, color .2s;
}
.nav-join:hover { background: var(--coral); color: var(--blue); }
.primary-nav > .nav-join { padding: 9px 17px; }
.primary-nav > .nav-join::after { display: none; }
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 48px;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: transparent;
  font-size: 14px;
  line-height: 1.2;
}
.nav-toggle[aria-expanded="true"] { background: var(--blue); color: var(--paper); }
.nav-toggle svg { width: 22px; height: 22px; }
.nav-toggle span { display: block; }
.search-shell { padding-block: 18px; border-bottom: 1px solid var(--line); background: var(--paper); }
.search-shell > .container { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.search-form { display: flex; gap: 0; width: min(100%, 560px); min-width: 0; }
.search-form input {
  width: 100%;
  min-height: 46px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-right: 0;
  border-radius: 3px 0 0 3px;
  background: transparent;
  font-size: 16px;
}
.search-form button {
  flex-shrink: 0;
  min-width: 76px;
  min-height: 46px;
  padding: 10px 18px;
  border-radius: 0 3px 3px 0;
  background: var(--blue);
  color: var(--paper);
  font-size: 14px;
}
.search-tip { color: var(--muted); font-size: 14px; }

/* 封面：左侧大字、右侧压边影像。 */
.cover-grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: 48px; align-items: center; padding-top: 46px; }
.cover-copy { position: relative; z-index: 2; min-width: 0; padding-block: 30px 48px; }
.cover-title {
  max-width: 9em;
  font-size: clamp(64px, 7.5vw, 108px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.065em;
  text-wrap: balance;
}
.cover-title em, .cover-title strong { color: var(--coral); font-style: normal; font-weight: inherit; }
.cover-intro { max-width: 31em; margin-top: 32px; color: var(--muted); font-size: 17px; line-height: 1.95; }
.cover-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 23px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  text-align: center;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-solid { background: var(--blue); color: var(--paper); }
.button-solid:hover { background: var(--coral); color: var(--blue); }
.button-line { border-color: var(--blue); background: transparent; color: var(--blue); }
.button-line:hover { background: var(--blue); color: var(--paper); }
.section-blue .button-solid { background: var(--coral); color: var(--blue); }
.section-blue .button-solid:hover { background: var(--paper); }
.section-blue .button-line { border-color: var(--blue-line); color: var(--paper); }
.section-blue .button-line:hover { background: var(--paper); color: var(--blue); }
.cover-visual {
  position: relative;
  isolation: isolate;
  align-self: stretch;
  min-height: 620px;
  margin-right: calc(-1 * min(var(--gutter), 48px));
  overflow: hidden;
  border-radius: 4px 0 0 4px;
  background: var(--gray);
}
.cover-visual > img { width: 100%; height: 100%; position: absolute; inset: 0; object-fit: cover; object-position: center; }
.cover-visual::after { content: ""; position: absolute; z-index: 0; inset: 0; background: linear-gradient(180deg, rgba(23,62,74,.02) 50%, rgba(23,62,74,.7)); pointer-events: none; }
.cover-tag { position: absolute; z-index: 1; top: 24px; left: 24px; max-width: calc(100% - 48px); padding: 7px 12px; background: var(--paper); color: var(--blue); font-size: 14px; font-weight: 650; }
.cover-index { position: absolute; z-index: 1; bottom: 24px; right: 28px; color: var(--paper); font-size: clamp(44px, 5vw, 72px); font-weight: 800; line-height: 1; letter-spacing: -.06em; }
.cover-footer { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; padding-block: 23px; margin-top: 24px; border-top: 1px solid var(--line); }
.issue-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; font-size: 14px; color: var(--muted); }
.issue-meta strong { color: var(--blue); font-weight: 700; }

/* 章节导航和共享信息层。 */
.section-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 38px; }
.section-header > div { min-width: 0; }
.section-header .kicker { margin-bottom: 14px; }
.section-title { font-size: clamp(32px, 3.8vw, 52px); font-weight: 850; letter-spacing: -.045em; line-height: 1.2; }
.section-lead { max-width: 45em; margin-top: 18px; color: var(--muted); font-size: 16px; }
.section-blue .section-lead { color: #ced8d5; }
.section-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; flex-shrink: 0; font-size: 14px; font-weight: 650; }
.section-nav a { padding-block: 8px; border-bottom: 1px solid currentColor; }
.section-nav a:hover { color: var(--coral); }
.pill { display: inline-flex; align-items: center; min-height: 28px; padding: 2px 10px; border: 1px solid var(--line); border-radius: 3px; color: var(--muted); font-size: 14px; line-height: 1.5; }
.section-blue .pill { border-color: var(--blue-line); color: var(--paper); }
.tag-row, .video-tags { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; }
.tag-row { margin-top: 22px; }
.stat-line { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 22px; padding-top: 16px; margin-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.stat-line strong { color: var(--blue); font-weight: 750; }
.section-blue .stat-line { border-color: var(--blue-line); color: #ced8d5; }
.section-blue .stat-line strong { color: var(--paper); }
.video-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.video-actions button, .video-actions a { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px; padding: 8px 13px; border: 1px solid var(--line); border-radius: 3px; background: transparent; font-size: 14px; }
.video-actions button:hover, .video-actions a:hover { background: var(--blue); color: var(--paper); }
.section-blue .video-actions button, .section-blue .video-actions a { border-color: var(--blue-line); }
.section-blue .video-actions button:hover, .section-blue .video-actions a:hover { background: var(--paper); color: var(--blue); }

/* 影像卡片：封面始终有可见的触屏播放入口。 */
.feature-grid { display: grid; grid-template-columns: 1.7fr 1fr; gap: 36px; align-items: start; }
.feature-primary, .feature-aside, .video-card { min-width: 0; }
.feature-aside { display: grid; gap: 30px; }
.video-card { position: relative; }
.video-cover { position: relative; isolation: isolate; overflow: hidden; aspect-ratio: 16 / 10; border-radius: var(--radius); background: var(--gray); }
.video-cover > img, .video-cover > a > img { width: 100%; height: 100%; object-fit: cover; transition: transform .7s cubic-bezier(.22,.61,.36,1); }
.video-cover > a { display: block; height: 100%; }
.video-cover::after { content: ""; position: absolute; z-index: 0; inset: 0; background: linear-gradient(180deg, rgba(23,62,74,.05) 40%, rgba(23,62,74,.52)); pointer-events: none; }
.video-card:hover .video-cover img, .video-card:focus-within .video-cover img { transform: scale(1.035); }
.feature-primary .video-cover { aspect-ratio: 16 / 11; }
.feature-aside .video-cover { aspect-ratio: 16 / 8; }
.play-control {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  padding: 0;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(255,253,248,.85);
  border-radius: 50%;
  background: rgba(23,62,74,.43);
  color: var(--white);
  font-size: 16px;
  line-height: 1;
  backdrop-filter: blur(4px);
  transition: background .2s ease, color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.play-control::before { content: ""; width: 0; height: 0; margin-left: 4px; border-top: 8px solid transparent; border-bottom: 8px solid transparent; border-left: 12px solid currentColor; }
.play-control > svg { display: none; }
.play-control:hover, .play-control:focus-visible {
  background: var(--coral);
  color: var(--blue);
  border-color: var(--coral);
  box-shadow: 0 0 0 8px rgba(241,117,86,.24);
  transform: translate(-50%, -50%) scale(1.07);
}
.duration { position: absolute; z-index: 1; right: 14px; bottom: 13px; padding: 3px 8px; border-radius: 2px; background: rgba(23,62,74,.85); color: var(--paper); font-size: 14px; line-height: 1.5; font-variant-numeric: tabular-nums; }
.cover-label { position: absolute; z-index: 1; left: 14px; top: 14px; max-width: calc(100% - 28px); padding: 4px 9px; background: var(--paper); color: var(--blue); font-size: 14px; line-height: 1.5; }
.video-info { padding-top: 20px; }
.video-number { display: block; margin-bottom: 9px; color: var(--muted); font-size: 14px; font-weight: 650; letter-spacing: .06em; }
.video-title { font-size: 24px; line-height: 1.45; letter-spacing: -.02em; }
.video-title a:hover { text-decoration: underline; text-decoration-thickness: 1px; }
.video-desc { margin-top: 12px; color: var(--muted); font-size: 15px; line-height: 1.85; }
.video-meta { display: flex; flex-wrap: wrap; gap: 7px 16px; margin-top: 14px; color: var(--muted); font-size: 14px; }
.video-tags { margin-top: 15px; }
.feature-primary .video-title { font-size: clamp(26px, 2.7vw, 36px); }
.feature-aside .video-info { padding-top: 14px; }
.feature-aside .video-title { font-size: 20px; }
.section-blue .video-number, .section-blue .video-desc, .section-blue .video-meta { color: #ced8d5; }
.catalog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 44px 28px; }
.catalog-grid .video-cover { aspect-ratio: 16 / 10; }
.catalog-grid .video-title { font-size: 22px; }
.filter-bar { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; margin-bottom: 30px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.filter { min-height: 44px; padding: 8px 18px; border: 1px solid var(--line); border-radius: 3px; background: transparent; color: var(--blue); font-size: 14px; transition: background .2s, border-color .2s; }
.filter:hover { border-color: var(--blue); }
.filter.active, .filter[aria-pressed="true"] { border-color: var(--blue); background: var(--blue); color: var(--paper); }
.section-blue .filter-bar { border-color: var(--blue-line); }
.section-blue .filter { border-color: var(--blue-line); color: var(--paper); }
.section-blue .filter.active, .section-blue .filter[aria-pressed="true"] { background: var(--paper); color: var(--blue); }

/* 深海蓝竖屏放映带。 */
.shorts-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.short-card { position: relative; isolation: isolate; overflow: hidden; min-width: 0; aspect-ratio: 9 / 15; border-radius: var(--radius); background: #244b55; color: var(--paper); }
.short-card > img { width: 100%; height: 100%; object-fit: cover; transition: transform .7s ease; }
.short-card::after { content: ""; position: absolute; z-index: 0; inset: 0; background: linear-gradient(180deg, rgba(23,62,74,.15), transparent 28%, rgba(23,62,74,.12) 45%, rgba(23,62,74,.9)); pointer-events: none; }
.short-card:hover > img, .short-card:focus-within > img { transform: scale(1.04); }
.short-card .play-control { width: 52px; height: 52px; top: 43%; }
.short-info { position: absolute; z-index: 1; bottom: 23px; left: 20px; right: 20px; pointer-events: none; }
.short-info a, .short-info button { pointer-events: auto; }
.short-info h3 { font-size: 22px; line-height: 1.4; }
.short-info p { margin-top: 9px; font-size: 14px; line-height: 1.65; color: #e1e6e0; }
.short-index { position: absolute; z-index: 1; top: 17px; left: 19px; font-size: 14px; font-weight: 650; letter-spacing: .08em; }
.channel-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.channel { position: relative; display: flex; flex-direction: column; min-height: 166px; padding: 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .2s; }
.channel:hover { background: var(--gray); }
.channel-index { margin-bottom: 28px; color: var(--muted); font-size: 14px; letter-spacing: .08em; }
.channel-name { font-size: 24px; font-weight: 750; line-height: 1.4; }
.channel p { margin-top: 9px; color: var(--muted); font-size: 14px; }
.section-blue .channel-grid, .section-blue .channel { border-color: var(--blue-line); }
.section-blue .channel:hover { background: #244b55; }
.section-blue .channel-index, .section-blue .channel p { color: #ced8d5; }

/* AI 影像实验室，保留原生表单与清晰反馈。 */
.ai-split { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; align-items: start; }
.ai-console { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,253,248,.5); }
.ai-console h3 { margin-bottom: 22px; font-size: 24px; }
.ai-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.ai-controls label { display: grid; gap: 8px; min-width: 0; font-size: 14px; font-weight: 650; }
.ai-controls select, .ai-controls input { width: 100%; min-height: 48px; padding: 10px 12px; border: 1px solid var(--line); background: var(--white); font-size: 16px; }
.ai-console > .button, .ai-controls + .button { width: 100%; margin-top: 22px; }
.ai-result { min-width: 0; padding-top: 2px; }
.ai-result h3 { margin-bottom: 16px; font-size: 24px; }
.ai-result > p { margin-top: 16px; color: var(--muted); font-size: 15px; }
.ai-example { position: relative; overflow: hidden; aspect-ratio: 16 / 10; border-radius: var(--radius); background: var(--gray); }
.ai-example > img { width: 100%; height: 100%; object-fit: cover; }
.ai-example figcaption { position: absolute; right: 14px; bottom: 14px; left: 14px; padding: 10px 14px; background: rgba(244,241,233,.93); color: var(--blue); font-size: 14px; }
.ai-steps { display: grid; gap: 12px; margin-top: 24px; padding-left: 1.5em; font-size: 15px; }
.ai-steps li::marker { color: var(--coral); font-weight: 750; }
.ai-note { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; line-height: 1.85; }
.section-blue .ai-console { border-color: var(--blue-line); background: rgba(255,253,248,.04); }
.section-blue .ai-controls select, .section-blue .ai-controls input { color: var(--blue); }
.section-blue .ai-note { border-color: var(--blue-line); color: #ced8d5; }
.section-blue .ai-result > p { color: #ced8d5; }

/* 社区话题、创作者与共创伙伴。 */
.discussion-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.discussion-card { position: relative; display: flex; flex-direction: column; min-width: 0; padding: 28px 0; border-top: 1px solid var(--line); }
.discussion-index { margin-bottom: 28px; color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.topic-category { display: inline-flex; align-self: flex-start; margin-bottom: 14px; color: #a74732; font-size: 14px; font-weight: 700; }
.discussion-card h3 { font-size: 24px; line-height: 1.5; }
.discussion-card h3 a:hover { text-decoration: underline; }
.discussion-card p { margin-top: 16px; color: var(--muted); font-size: 15px; }
.discussion-card .video-meta { margin-top: auto; padding-top: 24px; }
.section-blue .discussion-card { border-color: var(--blue-line); }
.section-blue .discussion-index, .section-blue .discussion-card p { color: #ced8d5; }
.section-blue .topic-category { color: #ffb49e; }
.experts-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.expert-card { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); }
.expert-avatar { display: grid; place-items: center; width: 72px; height: 72px; margin-bottom: 24px; border: 1px solid var(--line); border-radius: 50%; background: var(--gray); color: var(--blue); font-size: 26px; font-weight: 800; }
.expert-card:nth-child(3n + 2) .expert-avatar { background: #ead2c7; }
.expert-card:nth-child(3n) .expert-avatar { background: var(--blue); color: var(--paper); }
.expert-card h3 { font-size: 25px; }
.expert-role { margin-top: 7px; color: var(--muted); font-size: 14px; }
.expert-bio { margin-top: 20px; font-size: 15px; line-height: 1.9; }
.expert-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.expert-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.expert-links a { display: inline-flex; align-items: center; min-height: 44px; padding-block: 6px; border-bottom: 1px solid currentColor; font-size: 14px; }
.expert-links a:hover { color: #a74732; }
.partner-wall { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.partner-mark { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; min-height: 144px; padding: 24px 16px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 24px; font-weight: 800; text-align: center; letter-spacing: .04em; }
.partner-mark small { display: block; color: var(--muted); font-size: 14px; font-weight: 400; letter-spacing: .02em; }
.section-blue .partner-wall, .section-blue .partner-mark, .section-blue .expert-card, .section-blue .expert-meta { border-color: var(--blue-line); }
.section-blue .partner-mark small, .section-blue .expert-role, .section-blue .expert-meta { color: #ced8d5; }
.section-blue .expert-links a:hover { color: #ffb49e; }

/* 加入、问答与读者来信。 */
.join-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 64px; align-items: center; }
.join-photo { min-width: 0; overflow: hidden; aspect-ratio: 5 / 6; border-radius: var(--radius); background: var(--gray); }
.join-photo > img { width: 100%; height: 100%; object-fit: cover; }
.join-steps { display: grid; gap: 0; }
.join-step { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 20px; padding-block: 24px; border-bottom: 1px solid var(--line); }
.join-step:first-child { border-top: 1px solid var(--line); }
.step-number { color: #a74732; font-size: 16px; font-weight: 700; line-height: 1.9; }
.join-step h3 { font-size: 23px; }
.join-step p { margin-top: 10px; color: var(--muted); font-size: 15px; }
.join-steps > .button { justify-self: start; margin-top: 28px; }
.section-blue .join-step { border-color: var(--blue-line); }
.section-blue .step-number { color: #ffb49e; }
.section-blue .join-step p { color: #ced8d5; }
.faq-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 72px; align-items: start; }
.faq-intro { position: sticky; top: 128px; }
.faq-intro p { margin-top: 20px; color: var(--muted); font-size: 16px; }
.faq-intro .button { margin-top: 28px; }
.faq-list { min-width: 0; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { position: relative; padding: 24px 42px 24px 0; list-style: none; cursor: pointer; font-size: 19px; font-weight: 700; line-height: 1.65; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 1px; top: 25px; display: grid; place-items: center; width: 28px; height: 28px; color: var(--blue); font-size: 26px; font-weight: 400; line-height: 1; }
.faq-item[open] summary::after { content: "−"; color: #a74732; }
.faq-item summary:hover { color: #a74732; }
.faq-answer { padding: 0 38px 24px 0; color: var(--muted); font-size: 15px; line-height: 1.95; }
.faq-answer p + p { margin-top: 12px; }
.faq-answer a { text-decoration: underline; }
.section-blue .faq-list, .section-blue .faq-item { border-color: var(--blue-line); }
.section-blue .faq-intro p, .section-blue .faq-answer { color: #ced8d5; }
.section-blue .faq-item summary::after { color: var(--paper); }
.section-blue .faq-item summary:hover, .section-blue .faq-item[open] summary::after { color: #ffb49e; }
.reviews-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.review-card { display: flex; flex-direction: column; min-width: 0; padding: 28px 0; border-top: 1px solid var(--line); }
.review-card > p, .review-card blockquote { font-size: 19px; line-height: 1.9; }
.review-person { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 14px; margin-top: auto; padding-top: 28px; color: var(--muted); font-size: 14px; }
.review-person strong { color: var(--blue); font-size: 15px; }
.section-blue .review-card { border-color: var(--blue-line); }
.section-blue .review-person { color: #ced8d5; }
.section-blue .review-person strong { color: var(--paper); }

/* 联系与服务信息。 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.contact-image { overflow: hidden; aspect-ratio: 4 / 5; border-radius: var(--radius); background: var(--gray); }
.contact-image > img { width: 100%; height: 100%; object-fit: cover; }
.contact-list { min-width: 0; border-top: 1px solid var(--line); }
.contact-line { display: grid; grid-template-columns: 100px minmax(0, 1fr); gap: 20px; padding-block: 20px; border-bottom: 1px solid var(--line); }
.contact-line dt { color: var(--muted); font-size: 14px; }
.contact-line dd { font-size: 16px; overflow-wrap: anywhere; }
.contact-line a { text-decoration: underline; text-decoration-thickness: 1px; }
.qr-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 30px; }
.qr-card { min-width: 0; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); color: var(--blue); text-align: center; }
.qr-card > img { width: min(100%, 156px); aspect-ratio: 1; object-fit: contain; margin: 0 auto 16px; background: white; }
.qr-card strong { display: block; font-size: 16px; }
.qr-card p { margin-top: 6px; color: var(--muted); font-size: 14px; }
.section-blue .contact-list, .section-blue .contact-line { border-color: var(--blue-line); }
.section-blue .contact-line dt { color: #ced8d5; }
.service-strip { padding-block: 26px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.service-strip > .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px 32px; }
.share-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; font-size: 14px; }
.share-row button, .share-row a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 13px; border: 1px solid var(--line); border-radius: 3px; background: transparent; font-size: 14px; }
.share-row button:hover, .share-row a:hover { background: var(--blue); color: var(--paper); }
.service-status { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }
.service-status::before { content: ""; width: 7px; height: 7px; flex: 0 0 7px; border-radius: 50%; background: var(--coral); }
.section-blue .service-strip { border-color: var(--blue-line); }
.section-blue .share-row button, .section-blue .share-row a { border-color: var(--blue-line); }
.section-blue .share-row button:hover, .section-blue .share-row a:hover { background: var(--paper); color: var(--blue); }
.section-blue .service-status { color: #ced8d5; }
.site-footer { padding-block: 64px 28px; background: var(--blue); color: var(--paper); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 48px; }
.footer-logo { display: inline-flex; align-items: center; gap: 12px; font-size: 27px; font-weight: 850; line-height: 1.3; }
.footer-logo img { width: 48px; height: 48px; object-fit: contain; }
.footer-grid > div > p { max-width: 30em; margin-top: 20px; color: #ced8d5; font-size: 14px; }
.footer-links { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; }
.footer-links h3, .footer-links strong { margin-bottom: 10px; font-size: 16px; font-weight: 700; }
.footer-links a { padding-block: 5px; color: #ced8d5; font-size: 14px; }
.footer-links a:hover { color: var(--paper); text-decoration: underline; }
.footer-legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 28px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--blue-line); color: #ced8d5; font-size: 14px; line-height: 1.8; }
.footer-legal a:hover { text-decoration: underline; }

/* 内页与编辑内容。 */
.page-cover { padding-block: clamp(56px, 7vw, 100px); border-bottom: 1px solid var(--line); }
.page-breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; margin-bottom: 30px; color: var(--muted); font-size: 14px; }
.page-breadcrumb a:hover { color: var(--blue); text-decoration: underline; }
.page-title { max-width: 13em; font-size: clamp(44px, 6vw, 82px); font-weight: 900; line-height: 1.15; letter-spacing: -.055em; text-wrap: balance; }
.page-desc { max-width: 48em; margin-top: 26px; color: var(--muted); font-size: 18px; line-height: 1.9; }
.page-contents { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 32px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 14px; }
.page-contents a { display: inline-flex; align-items: center; min-height: 44px; padding-block: 6px; border-bottom: 1px solid transparent; }
.page-contents a:hover { border-color: currentColor; }
.section-blue .page-desc, .section-blue .page-breadcrumb { color: #ced8d5; }
.section-blue .page-contents { border-color: var(--blue-line); }
.section-blue .page-breadcrumb a:hover { color: var(--paper); }
.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.article-card { display: flex; flex-direction: column; min-width: 0; padding-block: 24px; border-top: 1px solid var(--line); }
.article-card > img, .article-card > a > img { width: 100%; aspect-ratio: 16 / 10; margin-bottom: 22px; object-fit: cover; border-radius: var(--radius); }
.article-card h3 { font-size: 24px; line-height: 1.5; }
.article-card h3 a:hover { text-decoration: underline; }
.article-card p { margin-top: 14px; color: var(--muted); font-size: 15px; }
.article-card > .button { align-self: flex-start; margin-top: 22px; }
.tools-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.tool-card { min-width: 0; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,253,248,.4); }
.tool-card h3 { font-size: 24px; }
.tool-card p { margin-top: 15px; color: var(--muted); font-size: 15px; }
.tool-card .button { margin-top: 24px; }
.table-wrap { max-width: 100%; margin-block: 30px; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); overscroll-behavior-x: contain; }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: 14px; line-height: 1.8; }
th, td { min-width: 128px; padding: 17px 20px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--gray); color: var(--blue); font-weight: 750; }
tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(214,219,215,.24); }
caption { padding: 18px 20px; font-size: 16px; font-weight: 700; text-align: left; }
.editorial-note, .notice, .team-note { margin-top: 28px; padding: 22px 26px; border-left: 3px solid var(--coral); background: rgba(214,219,215,.35); color: var(--blue); font-size: 15px; line-height: 1.9; }
.editorial-note h3, .notice h3, .team-note h3 { margin-bottom: 10px; font-size: 20px; }
.editorial-note p + p, .notice p + p, .team-note p + p { margin-top: 12px; }
.section-blue .article-card, .section-blue .tool-card, .section-blue .table-wrap, .section-blue td, .section-blue th { border-color: var(--blue-line); }
.section-blue .article-card p, .section-blue .tool-card p { color: #ced8d5; }
.section-blue .tool-card { background: rgba(255,253,248,.035); }
.section-blue .editorial-note, .section-blue .notice, .section-blue .team-note { background: rgba(244,241,233,.07); color: var(--paper); }
.chapter-list { display: grid; gap: 10px; margin-top: 24px; padding: 0; list-style: none; }
.chapter { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 46px; padding: 10px 15px; border: 1px solid var(--line); border-radius: 3px; background: transparent; text-align: left; font-size: 14px; line-height: 1.6; }
.chapter:hover { border-color: var(--coral); }
.chapter.active, .chapter[aria-current="true"], .chapter[aria-pressed="true"] { border-color: var(--coral); background: var(--coral); color: var(--blue); }

/* 原生弹窗：分镜预览而非伪造的在线视频。 */
dialog:not([open]) { display: none; }
dialog[open] { display: block; }
dialog {
  position: fixed;
  inset: 0;
  width: min(920px, calc(100% - 32px));
  max-width: 920px;
  max-height: calc(100dvh - 48px);
  margin: auto;
  padding: 28px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--blue);
  box-shadow: 0 24px 90px rgba(0,0,0,.25);
}
dialog::backdrop { background: rgba(8,29,36,.82); backdrop-filter: blur(5px); }
.film-dialog { padding: 24px; }
.dialog-close { position: sticky; z-index: 5; top: 0; display: flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; margin: 0 0 16px auto; padding: 8px 13px; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); color: var(--blue); font-size: 16px; }
.dialog-close:hover { background: var(--blue); color: var(--paper); }
.film-stage { position: relative; overflow: hidden; aspect-ratio: 16 / 9; border-radius: 4px; background: var(--blue); color: var(--paper); }
.film-stage > video { display: none; }
.film-preview { position: absolute; display: block; inset: 0; visibility: visible; opacity: 1; }
.film-preview > img { width: 100%; height: 100%; object-fit: cover; }
.film-preview::after { content: ""; position: absolute; inset: 0; background: linear-gradient(transparent 55%, rgba(8,29,36,.7)); pointer-events: none; }
.chapter-label { position: absolute; z-index: 1; left: 20px; right: 20px; bottom: 18px; color: var(--paper); font-size: 15px; font-weight: 650; }
.film-caption { margin-top: 22px; }
.film-caption h2, .film-caption h3 { font-size: clamp(23px, 3vw, 32px); }
.film-caption p { margin-top: 10px; color: var(--muted); font-size: 15px; }
.progress-track { height: 4px; margin-top: 22px; overflow: hidden; border-radius: 2px; background: var(--gray); }
.progress-fill { display: block; width: 0; height: 100%; background: var(--coral); transition: width .3s ease; }
.film-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.film-controls button { min-height: 44px; padding: 9px 16px; border: 1px solid var(--line); border-radius: 3px; background: transparent; font-size: 14px; }
.film-controls button:hover { background: var(--blue); color: var(--paper); }
.film-dialog .chapter-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.share-dialog { max-width: 520px; }
.share-dialog h2 { font-size: 28px; }
.share-dialog p { margin-top: 16px; color: var(--muted); font-size: 15px; }
.share-dialog input { width: 100%; min-height: 46px; margin-top: 20px; padding: 10px 12px; border: 1px solid var(--line); background: var(--white); font-size: 16px; }
.share-dialog .share-row { margin-top: 24px; }
.toast { position: fixed; z-index: 150; left: 50%; bottom: 28px; width: max-content; max-width: calc(100% - 40px); padding: 14px 22px; transform: translate(-50%, 20px); border: 1px solid rgba(244,241,233,.25); border-radius: var(--radius); background: var(--blue); color: var(--paper); box-shadow: 0 8px 30px rgba(0,0,0,.15); opacity: 0; visibility: hidden; pointer-events: none; text-align: center; font-size: 14px; transition: opacity .2s ease, transform .2s ease, visibility .2s; }
.toast.is-visible { transform: translate(-50%, 0); opacity: 1; visibility: visible; }
.back-top { position: fixed; z-index: 40; right: 24px; bottom: 24px; display: flex; align-items: center; justify-content: center; width: 48px; min-height: 48px; padding: 8px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper); color: var(--blue); font-size: 14px; line-height: 1.3; box-shadow: 0 4px 18px rgba(23,62,74,.08); }
.back-top:hover { background: var(--coral); }

/* 1120px 即收起导航，给长中文品牌留出完整空间。 */
@media (max-width: 1120px) {
  .nav-shell { min-height: 82px; gap: 16px; }
  .brandmark { flex: 1; min-width: 0; }
  .nav-toggle { display: flex; flex-shrink: 0; }
  .primary-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: calc(-1 * var(--gutter));
    right: calc(-1 * var(--gutter));
    display: none;
    align-items: stretch;
    gap: 0;
    max-height: calc(100dvh - 90px);
    padding: 14px var(--gutter) 22px;
    overflow-y: auto;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 18px 25px rgba(23,62,74,.06);
  }
  .primary-nav.is-open { display: flex; flex-direction: column; }
  .primary-nav > a { min-height: 48px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
  .primary-nav > a::after { display: none; }
  .primary-nav > a[aria-current="page"] { color: #a74732; }
  .primary-nav > .nav-join { align-self: flex-start; padding: 10px 20px; margin-top: 16px; border: 0; }
  .cover-grid { gap: 30px; }
  .cover-visual { min-height: 560px; }
  .cover-title { font-size: clamp(60px, 8vw, 86px); }
  .cover-intro { font-size: 16px; }
  .section-header { gap: 24px; }
  .feature-grid { gap: 26px; grid-template-columns: 1.5fr 1fr; }
  .feature-primary .video-cover { aspect-ratio: 4 / 3; }
  .feature-aside .video-title { font-size: 19px; }
  .catalog-grid { gap: 36px 22px; }
  .shorts-grid { gap: 16px; }
  .short-info { left: 16px; right: 16px; bottom: 18px; }
  .short-info h3 { font-size: 20px; }
  .ai-split, .join-grid, .contact-grid { gap: 36px; }
  .faq-grid { gap: 42px; }
  .expert-card, .tool-card { padding: 24px; }
  .footer-grid { gap: 32px; }
}

/* 平板：杂志栏位重排，不挤压中文阅读。 */
@media (max-width: 900px) {
  .cover-grid { grid-template-columns: 1fr 1fr; gap: 26px; }
  .cover-title { font-size: clamp(56px, 8.4vw, 74px); }
  .cover-copy { padding-block: 12px 32px; }
  .cover-visual { min-height: 520px; }
  .cover-intro { margin-top: 24px; }
  .cover-actions { gap: 10px; margin-top: 24px; }
  .cover-actions .button { padding-inline: 17px; }
  .section-header { align-items: flex-start; flex-direction: column; }
  .section-nav { flex-shrink: 1; }
  .feature-grid { grid-template-columns: 1fr; gap: 32px; }
  .feature-primary .video-cover { aspect-ratio: 16 / 9; }
  .feature-aside { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .feature-aside .video-cover { aspect-ratio: 16 / 10; }
  .catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shorts-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .short-card { aspect-ratio: 9 / 13; }
  .short-info h3 { font-size: 25px; }
  .short-info { left: 22px; right: 22px; bottom: 24px; }
  .channel-grid, .partner-wall { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ai-split { grid-template-columns: 1fr 1fr; gap: 26px; }
  .ai-console { padding: 22px; }
  .ai-controls { grid-template-columns: 1fr; gap: 16px; }
  .discussion-grid { grid-template-columns: 1fr; gap: 0; }
  .discussion-card { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 0 22px; padding-block: 25px; }
  .discussion-index { grid-column: 1; grid-row: 1 / span 4; margin: 0; }
  .discussion-card > :not(.discussion-index) { grid-column: 2; }
  .discussion-card .video-meta { margin-top: 0; padding-top: 16px; }
  .experts-grid, .tools-grid, .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .join-grid { gap: 30px; }
  .join-photo { aspect-ratio: 3 / 5; }
  .join-step { grid-template-columns: 30px minmax(0, 1fr); gap: 12px; }
  .faq-grid { grid-template-columns: 1fr; gap: 32px; }
  .faq-intro { position: static; }
  .faq-intro p { max-width: 40em; }
  .reviews-grid { grid-template-columns: 1fr; gap: 0; }
  .review-card { display: grid; grid-template-columns: 1fr 170px; gap: 28px; align-items: start; }
  .review-person { padding-top: 4px; margin-top: 0; }
  .contact-grid { gap: 28px; }
  .contact-line { grid-template-columns: 1fr; gap: 5px; }
  .qr-grid { gap: 12px; }
  .qr-card { padding: 14px; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; gap: 24px; }
  .search-shell > .container { flex-direction: column; align-items: flex-start; gap: 8px; }
  .search-form { width: 100%; }
}

/* 手机：320px 起可用，字号不小于 14px。 */
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  html { scroll-padding-top: 94px; }
  .section { padding-block: 56px; }
  .nav-shell { min-height: 78px; gap: 10px; }
  .brandmark { gap: 9px; }
  .brandname { font-size: 17px; letter-spacing: 0; }
  .brandcaption { font-size: 14px; letter-spacing: 0; }
  .nav-shell > .nav-join { display: none; }
  .nav-toggle { min-width: 44px; min-height: 44px; padding: 7px; }
  .nav-toggle span { font-size: 14px; }
  .primary-nav { max-height: calc(100dvh - 80px); }
  .search-shell { padding-block: 14px; }
  .search-form button { min-width: 64px; padding-inline: 14px; }
  .search-tip { line-height: 1.6; }
  .cover-grid { grid-template-columns: 1fr; gap: 28px; padding-top: 32px; }
  .cover-copy { padding: 0; }
  .eyebrow, .kicker { margin-bottom: 20px; letter-spacing: .08em; }
  .cover-title { max-width: 8em; font-size: clamp(56px, 13.8vw, 84px); line-height: 1.1; letter-spacing: -.05em; }
  .cover-intro { max-width: 33em; margin-top: 24px; font-size: 16px; }
  .cover-actions { margin-top: 26px; gap: 10px; }
  .cover-actions .button { flex: 1; padding-inline: 12px; }
  .cover-visual { min-height: 0; height: auto; aspect-ratio: 5 / 4; margin: 0 calc(-1 * var(--gutter)) 0 0; border-radius: 3px 0 0 3px; }
  .cover-tag { top: 16px; left: 16px; max-width: calc(100% - 32px); padding: 5px 9px; }
  .cover-index { right: 20px; bottom: 20px; font-size: 52px; }
  .cover-footer { margin-top: 20px; padding-block: 20px; gap: 10px; }
  .issue-meta { gap: 5px 15px; font-size: 14px; }
  .section-header { gap: 20px; margin-bottom: 28px; }
  .section-title { font-size: 34px; line-height: 1.25; }
  .section-lead { margin-top: 16px; font-size: 15px; }
  .section-nav { gap: 8px 20px; }
  .feature-aside { grid-template-columns: 1fr; gap: 30px; }
  .feature-aside .video-cover { aspect-ratio: 16 / 10; }
  .feature-primary .video-title { font-size: 27px; }
  .feature-aside .video-title, .catalog-grid .video-title { font-size: 23px; }
  .video-info { padding-top: 17px; }
  .video-title { font-size: 23px; }
  .video-desc { margin-top: 10px; }
  .video-meta { gap: 6px 13px; }
  .video-actions { gap: 8px; }
  .play-control { width: 54px; height: 54px; }
  .catalog-grid { grid-template-columns: 1fr; gap: 34px; }
  .filter-bar { gap: 8px; padding-bottom: 18px; margin-bottom: 26px; }
  .filter { padding-inline: 14px; }
  .shorts-grid { gap: 14px; }
  .short-card { aspect-ratio: 9 / 16; }
  .short-card .play-control { width: 46px; height: 46px; top: 39%; }
  .short-info { left: 12px; right: 12px; bottom: 15px; }
  .short-info h3 { font-size: 18px; line-height: 1.45; }
  .short-info p { margin-top: 6px; font-size: 14px; line-height: 1.5; }
  .short-index { top: 12px; left: 12px; letter-spacing: 0; }
  .channel { min-height: 154px; padding: 20px 16px; }
  .channel-name { font-size: 22px; }
  .channel-index { margin-bottom: 24px; }
  .ai-split { grid-template-columns: 1fr; gap: 30px; }
  .ai-console { padding: 22px 20px; }
  .ai-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 12px; }
  .ai-example { aspect-ratio: 4 / 3; }
  .ai-result h3 { font-size: 23px; }
  .discussion-card { grid-template-columns: 32px minmax(0, 1fr); gap: 0 14px; }
  .discussion-card h3 { font-size: 22px; }
  .topic-category { margin-bottom: 10px; }
  .experts-grid, .tools-grid, .article-grid { grid-template-columns: 1fr; gap: 22px; }
  .expert-card { padding: 26px; }
  .expert-avatar { width: 68px; height: 68px; margin-bottom: 20px; }
  .expert-bio { margin-top: 18px; }
  .partner-mark { min-height: 128px; padding: 20px 12px; font-size: 21px; }
  .partner-mark small { font-size: 14px; }
  .join-grid { grid-template-columns: 1fr; gap: 30px; }
  .join-photo { aspect-ratio: 5 / 4; }
  .join-step { grid-template-columns: 32px minmax(0, 1fr); gap: 14px; padding-block: 22px; }
  .join-step h3 { font-size: 22px; }
  .faq-grid { gap: 28px; }
  .faq-item summary { padding-block: 22px; font-size: 17px; }
  .faq-item summary::after { top: 23px; }
  .faq-answer { padding-right: 18px; font-size: 15px; }
  .review-card { display: flex; gap: 0; padding-block: 26px; }
  .review-card > p, .review-card blockquote { font-size: 18px; }
  .review-person { margin-top: 22px; padding: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 30px; }
  .contact-image { aspect-ratio: 5 / 4; }
  .contact-line { grid-template-columns: 84px minmax(0, 1fr); gap: 12px; }
  .qr-grid { gap: 14px; margin-top: 24px; }
  .qr-card { padding: 16px 12px; }
  .service-strip { padding-block: 22px; }
  .service-strip > .container { align-items: flex-start; gap: 16px; }
  .share-row { gap: 8px; }
  .share-row > span { flex-basis: 100%; }
  .site-footer { padding-block: 46px 24px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 22px; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .footer-logo { font-size: 25px; }
  .footer-legal { flex-direction: column; gap: 8px; margin-top: 32px; padding-top: 22px; }
  .page-cover { padding-block: 42px 48px; }
  .page-breadcrumb { margin-bottom: 24px; }
  .page-title { font-size: clamp(40px, 10.6vw, 62px); line-height: 1.2; }
  .page-desc { margin-top: 22px; font-size: 16px; }
  .page-contents { gap: 6px 20px; margin-top: 24px; padding-top: 18px; }
  .article-card { padding-block: 22px; }
  .article-card h3 { font-size: 23px; }
  .tool-card { padding: 24px; }
  .editorial-note, .notice, .team-note { padding: 20px; }
  th, td { min-width: 120px; padding: 14px 16px; }
  dialog { max-width: calc(100% - 32px); max-height: calc(100dvh - 32px); padding: 18px; }
  .film-dialog { padding: 14px; }
  .dialog-close { margin-bottom: 12px; }
  .film-stage { aspect-ratio: 4 / 3; }
  .chapter-label { left: 14px; right: 14px; bottom: 14px; font-size: 14px; }
  .film-caption { margin-top: 18px; }
  .film-caption h2, .film-caption h3 { font-size: 23px; }
  .film-dialog .chapter-list { grid-template-columns: 1fr; gap: 8px; }
  .film-controls { gap: 8px; }
  .film-controls button { flex: 1; padding-inline: 10px; }
  .share-dialog h2 { font-size: 25px; }
  .toast { bottom: 84px; padding: 13px 18px; }
  .back-top { right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); width: 44px; min-height: 44px; }
}

/* 最窄屏幕仍保留双竖屏节奏，避免表单与品牌挤出视口。 */
@media (max-width: 374px) {
  :root { --gutter: 16px; }
  .brandname { font-size: 15px; }
  .brandcaption { font-size: 14px; }
  .brandmark { gap: 7px; }
  .brandmark > span { flex: 1; }
  .nav-shell { gap: 7px; }
  .cover-title { font-size: 54px; }
  .cover-actions { gap: 8px; }
  .cover-actions .button { padding-inline: 9px; font-size: 14px; }
  .section-title { font-size: 31px; }
  .shorts-grid { gap: 12px; }
  .short-info { left: 10px; right: 10px; bottom: 12px; }
  .short-info h3 { font-size: 16px; }
  .short-info p { line-height: 1.45; }
  .short-card .play-control { top: 33%; }
  .channel { padding-inline: 13px; }
  .channel-name { font-size: 20px; }
  .ai-controls { grid-template-columns: 1fr; }
  .expert-card, .tool-card { padding: 22px; }
  .contact-line { grid-template-columns: 1fr; gap: 5px; }
  .qr-grid { gap: 10px; }
  .qr-card { padding: 12px 9px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .video-card:hover .video-cover img,
  .video-card:focus-within .video-cover img,
  .short-card:hover > img,
  .short-card:focus-within > img,
  .button:hover { transform: none; }
}

@media print {
  .site-header, .search-shell, .nav-toggle, .back-top, .toast,
  .play-control, .video-actions, .share-row, dialog { display: none !important; }
  body, .section, .page-cover, .site-footer { background: white; color: #173e4a; }
  .container { width: 100%; }
  .section { padding-block: 28px; }
  .cover-grid { grid-template-columns: 1fr 1fr; }
  .cover-visual { min-height: 300px; margin-right: 0; }
  .cover-title { font-size: 48px; }
  .faq-intro { position: static; }
  .video-card, .expert-card, .review-card, .faq-item { break-inside: avoid; }
  .site-footer p, .footer-links a, .footer-legal { color: #173e4a; }
}

/* 最终HTML联调：保留内容流与说明文字，不让图片框裁切正文。 */
.cover-footer {grid-column: 1 / -1; margin-top: 0;}
.cover-copy .issue-meta {margin-top: 32px; padding-top: 22px; border-top: 1px solid var(--line);}
.video-title > button {display: inline; padding: 0; background: transparent; color: inherit; font: inherit; text-align: left; line-height: inherit;}
.video-title > button:hover {text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .2em;}
.play-control {font-size: 0;}
.play-control > span {display: none;}
.ai-example, .join-photo, .contact-image {overflow: visible; aspect-ratio: auto; background: transparent;}
.ai-example > img {width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; border-radius: var(--radius);}
.join-photo > img {width: 100%; height: auto; aspect-ratio: 5 / 4; object-fit: cover; border-radius: var(--radius);}
.contact-image > img {width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; border-radius: var(--radius);}
.image-caption {margin-top: 13px; color: var(--muted); font-size: 14px; line-height: 1.8;}
.ai-result {margin-top: 24px; padding: 20px; border: 1px dashed var(--line); font-size: 15px; line-height: 1.9;}
.expert-meta {display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 8px 12px;}
.expert-meta dt {font-weight: 700; color: var(--blue);}
.expert-meta dd {min-width: 0; overflow-wrap: anywhere;}
.footer-logo {display: block; font-size: inherit; font-weight: 400; line-height: 1.8;}
.site-footer .brandcaption {color: #ced8d5;}
.footer-links p, .footer-links small {font-size: 14px; overflow-wrap: anywhere;}
.page-contents {display: block; margin-top: 0; padding-top: 0; border-top: 0;}
.page-contents > .article-grid + .tools-grid, .page-contents > .catalog-grid + .article-grid, .page-contents > .discussion-grid + .article-card {margin-top: 56px;}
.article-card h2 {font-size: 26px; line-height: 1.5;}
.article-card h4, .article-card h5, .article-card h6 {margin: 24px 0 0; font-size: 18px; line-height: 1.6; font-weight: 750;}
.discussion-card > button {align-self: flex-start; margin-top: 20px; min-height: 44px; padding: 8px 0; border-bottom: 1px solid currentColor; background: transparent; font-size: 14px; text-align: left;}
.partner-mark h3 {font-size: 16px; letter-spacing: 0;}
.service-strip {display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; margin-top: 48px;}
.service-strip h3 {font-size: 22px; margin-bottom: 8px;}
.share-row {margin-top: 28px;}
.share-row h3 {font-size: 20px; margin-right: 16px;}
.film-dialog .chapter-list {grid-template-columns: repeat(2, minmax(0, 1fr));}
@media (max-width: 600px) {
  .article-grid {grid-template-columns: 1fr;}
  .film-dialog .chapter-list {grid-template-columns: 1fr;}
  .cover-copy .issue-meta {margin-top: 26px;}
  .contact-image > img {aspect-ratio: 5 / 4;}
  .share-row h3 {width: 100%;}
}

/* 分镜控制按钮：保留实心主操作的可读对比度。 */
.film-controls .button-solid {background: var(--blue); color: var(--paper); border-color: var(--blue);}
.film-controls .button-line {background: transparent; color: var(--blue); border-color: var(--line);}
.film-controls .button-solid:hover, .film-controls .button-line:hover {background: var(--coral); color: var(--blue); border-color: var(--coral);}