/*
设计哲学提醒：机修纪录片工业折页风。
核心要求：工业纪实、胶片结构、信息层叠、视频优先、品牌91前置、避免泛紫渐变与通用企业模板感。
*/
:root {
  --bg: #0b0f10;
  --bg-soft: #131a1b;
  --panel: rgba(18, 24, 24, 0.84);
  --paper: #efede7;
  --text: #ecede8;
  --muted: #9ba6a2;
  --line: rgba(205, 217, 212, 0.18);
  --accent: #c57d3e;
  --accent-soft: #6a8779;
  --ink: #111616;
  --shadow: 0 22px 50px rgba(0,0,0,.26);
  --radius: 22px;
  --wrap: 1240px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(106,135,121,.16), transparent 32%),
    linear-gradient(180deg, #0a0d0d 0%, #111616 52%, #0c0f10 100%);
  font-family: 'Noto Sans SC', system-ui, sans-serif;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
.site-header, .section, .site-footer { width: min(var(--wrap), calc(100% - 32px)); margin: 0 auto; }
.site-header { padding: 20px 0 0; }
.brand-strip {
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
  padding: 14px 18px; border: 1px solid var(--line); border-radius: 20px;
  background: rgba(17, 22, 22, 0.72); backdrop-filter: blur(18px); box-shadow: var(--shadow);
}
.brand-lockup { display: flex; align-items: center; gap: 14px; }
.brand-lockup img { width: 78px; height: 78px; object-fit: contain; }
.brand-lockup strong { display: block; font: 900 2rem/1 'Noto Serif SC', serif; letter-spacing: .06em; }
.brand-lockup span, .top-meta span { color: var(--muted); font-size: .95rem; }
.top-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; text-align: right; }
.main-nav { margin-top: 14px; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; }
.nav-link {
  position: relative; padding: 14px 16px; border: 1px solid var(--line); border-radius: 18px;
  background: linear-gradient(135deg, rgba(18,24,24,.92), rgba(33,40,39,.78));
  min-height: 56px; display: flex; align-items: center; justify-content: center; text-align: center;
  transition: transform .28s ease, border-color .28s ease, color .28s ease;
}
.nav-link::before {
  content: ''; position: absolute; inset: 7px; border: 1px dashed rgba(197,125,62,.2); border-radius: 14px; opacity: 0; transition: opacity .28s ease;
}
.nav-link:hover { transform: translateY(-3px); border-color: rgba(197,125,62,.45); color: #fff; }
.nav-link:hover::before { opacity: 1; }
.search-band {
  margin-top: 14px; padding: 14px 18px 18px; background: rgba(15, 19, 19, .88);
  border-radius: 20px; border: 1px solid var(--line); box-shadow: var(--shadow);
}
.search-label { display: block; font-weight: 700; margin-bottom: 10px; }
.search-row { display: grid; grid-template-columns: 1fr 180px; gap: 10px; }
.search-row input {
  width: 100%; border: 1px solid rgba(197,125,62,.25); border-radius: 14px; padding: 14px 16px;
  background: rgba(241,236,228,.06); color: #fff;
}
.search-row input::placeholder { color: #b3bbb7; }
.search-btn, .btn-primary, .share-chip, .mcp-actions button {
  border: none; border-radius: 14px; cursor: pointer; background: linear-gradient(135deg, #c57d3e, #7c8f84);
  color: #fff; font-weight: 700; padding: 14px 16px; transition: transform .26s ease, filter .26s ease;
}
.search-btn:hover, .btn-primary:hover, .share-chip:hover, .mcp-actions button:hover { transform: translateY(-2px); filter: brightness(1.05); }
.search-hint { color: var(--muted); margin: 10px 0 0; font-size: .94rem; }
.breadcrumb { margin: 12px 2px 0; color: #c5cbc7; font-size: .94rem; }
.hero {
  width: min(calc(var(--wrap) + 80px), calc(100% - 16px)); margin: 22px auto 0; min-height: 78vh; border-radius: 34px;
  padding: 56px clamp(20px, 4vw, 56px); background-size: cover; background-position: center;
  display: grid; grid-template-columns: 1.18fr .82fr; gap: 24px; align-items: end; box-shadow: var(--shadow); position: relative;
}
.hero::after, .sub-hero::after {
  content: ''; position: absolute; inset: 18px; border: 1px solid rgba(236,237,232,.13); border-radius: 28px; pointer-events: none;
}
.hero-copy { max-width: 760px; }
.eyebrow { text-transform: uppercase; letter-spacing: .2em; font-size: .82rem; color: #d6c1a8; margin: 0 0 12px; }
.hero h1, .sub-hero h1, .section-head h2, .site-footer h2, .hero-aside h2 {
  font-family: 'Noto Serif SC', serif; line-height: 1.16; margin: 0 0 12px;
}
.hero h1 { font-size: clamp(2.2rem, 4.6vw, 4.7rem); max-width: 14ch; }
.section-head h2, .site-footer h2, .hero-aside h2 { font-size: clamp(1.6rem, 2.8vw, 2.8rem); }
.hero-copy p:last-of-type, .section-head p, .hero-aside p, .video-copy p, .topic-card p, .expert-card p, .service-card p, .review-card p, .faq-item p, .site-footer p, .contact-list li {
  line-height: 1.86; color: #cad1cd;
}
.update-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.update-bar span, .meta-line {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 12px; border-radius: 999px;
  border: 1px solid rgba(236,237,232,.14); background: rgba(236,237,232,.06); color: #d9e0dc; font-size: .9rem;
}
.cta-row { display: flex; gap: 14px; margin-top: 24px; flex-wrap: wrap; }
.btn-secondary, .btn-inline {
  padding: 14px 16px; border-radius: 14px; border: 1px solid rgba(236,237,232,.22); background: rgba(236,237,232,.08);
  color: #fff; font-weight: 700; transition: transform .26s ease, border-color .26s ease;
}
.btn-inline { padding: 11px 14px; font-size: .94rem; }
.btn-inline-light { background: transparent; }
.btn-secondary:hover, .btn-inline:hover { transform: translateY(-2px); border-color: rgba(197,125,62,.45); }
.hero-aside {
  background: linear-gradient(180deg, rgba(13,17,17,.74), rgba(13,17,17,.94)); border: 1px solid rgba(236,237,232,.16);
  border-radius: 24px; padding: 22px; backdrop-filter: blur(10px);
}
.hero-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 22px; }
.hero-stats div, .topic-card dl div, .video-copy dl div {
  padding: 14px; border-radius: 18px; background: rgba(240,236,228,.06); border: 1px solid rgba(240,236,228,.08);
}
.hero-stats span { display: block; font: 900 1.5rem/1 'Noto Serif SC', serif; color: #fff; margin-bottom: 6px; }
.hero-stats small { color: #b8c0bc; }
.section { padding: 68px 0 10px; }
.section-dark { padding: 76px 32px 26px; background: linear-gradient(180deg, rgba(18,24,24,.96), rgba(10,14,14,.96)); border-radius: 32px; border: 1px solid var(--line); }
.section-head { max-width: 920px; margin-bottom: 28px; }
.section-head.narrow { max-width: 820px; }
.video-grid, .review-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.video-card, .topic-card, .expert-card, .service-card, .review-card, .step-card {
  border: 1px solid var(--line); border-radius: 24px; background: rgba(18,24,24,.84); box-shadow: var(--shadow);
}
.video-shell { position: relative; min-height: 280px; background: #0a0d0d; overflow: hidden; border-radius: 24px 24px 0 0; }
.video-shell::after {
  content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,.08), rgba(0,0,0,.58));
}
.video-shell:hover .play-badge { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-shell:hover .video-poster { transform: scale(1.04); filter: saturate(1.02); }
.video-poster { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s ease, filter .4s ease; }
.play-badge {
  position: absolute; inset: 50% auto auto 50%; transform: translate(-50%, -50%) scale(.88); z-index: 2;
  width: 82px; height: 82px; border-radius: 50%; border: 1px solid rgba(255,255,255,.32); background: rgba(12,15,15,.72);
  color: #fff; font-size: 1.4rem; opacity: .18; transition: all .32s ease;
}
.video-ribbon { position: absolute; left: 16px; top: 16px; z-index: 2; font-size: .82rem; letter-spacing: .16em; padding: 8px 12px; border-radius: 999px; background: rgba(10,13,13,.66); border: 1px solid rgba(255,255,255,.15); }
.video-copy, .topic-card, .expert-card, .service-card, .review-card, .step-card { padding: 18px; }
.video-copy h3, .topic-card h3, .expert-card h3, .service-card h3, .review-card h3, .step-card h3 { margin: 0 0 10px; font-size: 1.14rem; }
.video-copy dl, .topic-card dl { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 10px; margin: 18px 0 0; }
.topic-card dl { grid-template-columns: repeat(2, minmax(0,1fr)); }
.video-copy dt, .topic-card dt { font-size: .84rem; color: #9fa7a3; }
.video-copy dd, .topic-card dd { margin: 6px 0 0; font-weight: 700; color: #fff; }
.split-layout { display: grid; grid-template-columns: 1.02fr .98fr; gap: 26px; align-items: center; }
.split-layout.reverse { grid-template-columns: .98fr 1.02fr; }
.image-panel img { border-radius: 28px; box-shadow: var(--shadow); border: 1px solid var(--line); }
.mini-grid, .topic-grid, .expert-grid, .step-grid, .json-stack { display: grid; gap: 16px; }
.mini-grid.three, .review-grid, .expert-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.topic-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
.service-card { background: rgba(236,237,232,.05); }
.logo-wall { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 18px; }
.logo-pill, .keyword-cloud span {
  padding: 10px 13px; border-radius: 999px; border: 1px dashed rgba(197,125,62,.34); background: rgba(236,237,232,.04); color: #efe8de;
}
.step-card span { display: inline-flex; width: 42px; height: 42px; border-radius: 50%; align-items: center; justify-content: center; background: rgba(197,125,62,.18); color: #fff; font-weight: 700; margin-bottom: 10px; }
.mini-list { margin: 0; padding-left: 18px; color: #ced4d0; }
.social-stack { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; color: #d6dbd8; font-size: .92rem; }
.action-row { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.qr-showcase { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; }
.qr-showcase figure, .qr-grid figure {
  margin: 0; padding: 12px; border-radius: 18px; background: rgba(236,237,232,.05); border: 1px solid rgba(236,237,232,.08);
}
.qr-showcase figcaption, .qr-grid figcaption { margin-top: 10px; text-align: center; color: #cfd5d2; }
.review-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.review-card span { color: #d9bf95; font-size: .92rem; }
.faq-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 24px; align-items: start; }
.faq-list { display: grid; gap: 14px; }
.faq-item { border: 1px solid var(--line); border-radius: 20px; padding: 0 18px; background: rgba(236,237,232,.04); }
.faq-item summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 700; }
.faq-item summary::-webkit-details-marker { display: none; }
.keyword-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.keyword-cloud.compact { margin-top: 14px; }
.section-json-wrap { padding-top: 40px; }
.json-panel { border: 1px solid var(--line); border-radius: 22px; background: rgba(236,237,232,.04); overflow: hidden; }
.json-panel summary { cursor: pointer; list-style: none; padding: 18px 20px; font-weight: 700; }
.json-panel summary::-webkit-details-marker { display: none; }
.json-block {
  margin: 0; white-space: pre-wrap; word-break: break-word; padding: 0 20px 20px; overflow: auto;
  color: #eff1eb; font: 500 .93rem/1.8 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
.site-footer { margin-top: 72px; padding-bottom: 34px; }
.footer-grid {
  display: grid; grid-template-columns: 1.05fr .9fr 1.05fr; gap: 20px; padding: 26px; border-radius: 30px;
  border: 1px solid var(--line); background: linear-gradient(180deg, rgba(16,21,21,.94), rgba(8,10,10,.98)); box-shadow: var(--shadow);
}
.contact-list { padding-left: 18px; margin: 0; }
.contact-list.large li { margin-bottom: 8px; }
.qr-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
.qr-grid.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
.share-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.mcp-panel { padding: 16px; border-radius: 20px; background: rgba(236,237,232,.04); border: 1px solid var(--line); }
.mcp-title { font-weight: 700; color: #fff; margin-top: 0; }
.mcp-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
.mcp-note { margin: 0; color: var(--muted); }
.footer-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 18px 6px 0; }
.footer-bar p { margin: 0; }
.sub-hero {
  position: relative; width: min(calc(var(--wrap) + 40px), calc(100% - 16px)); margin: 26px auto 0; padding: 74px 32px 58px;
  border-radius: 30px; background-size: cover; background-position: center; box-shadow: var(--shadow);
}
.sub-hero p { max-width: 60ch; line-height: 1.86; color: #dde2df; }
@media (max-width: 1120px) {
  .main-nav, .mini-grid.three, .review-grid, .expert-grid, .qr-showcase, .qr-grid.three { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .hero, .split-layout, .faq-layout, .footer-grid, .video-grid, .topic-grid { grid-template-columns: 1fr; }
  .section-dark { padding-inline: 18px; }
}
@media (max-width: 760px) {
  .site-header, .section, .site-footer { width: min(var(--wrap), calc(100% - 18px)); }
  .brand-strip { flex-direction: column; align-items: flex-start; }
  .top-meta { align-items: flex-start; text-align: left; }
  .main-nav { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .search-row, .mini-grid.three, .review-grid, .expert-grid, .qr-showcase, .qr-grid.three { grid-template-columns: 1fr; }
  .hero { padding: 26px 16px; min-height: auto; }
  .hero h1, .sub-hero h1 { font-size: clamp(1.86rem, 10vw, 2.8rem); }
  .video-grid, .topic-grid { grid-template-columns: 1fr; }
  .video-shell { min-height: 220px; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .footer-bar { flex-direction: column; align-items: flex-start; }
}