/* 91视频 · Original static brand system */
:root {
  --ink: #0b1130;
  --ink-2: #151e4a;
  --panel: #172455;
  --panel-soft: #202f69;
  --paper: #f6f7ff;
  --paper-2: #ecefff;
  --white: #ffffff;
  --aqua: #46e8d2;
  --lime: #d6ff55;
  --coral: #ff7a6e;
  --violet: #8f7bff;
  --muted: #8c98c7;
  --line: rgba(255,255,255,.13);
  --shadow: 0 24px 70px rgba(5, 10, 36, .20);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --ease-out: cubic-bezier(.23,1,.32,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
}
body::selection { background: var(--aqua); color: var(--ink); }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { border: 0; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  top: -100%;
  left: 18px;
  z-index: 100;
  padding: 12px 16px;
  border-radius: 8px;
  background: var(--lime);
  color: var(--ink);
}
.skip-link:focus { top: 18px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11,17,48,.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}
.header-wrap {
  width: min(1240px, calc(100% - 40px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 26px;
}
.brand-logo {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: -.03em;
}
.brand-logo img { width: 39px; height: 39px; }
.brand-logo em { color: var(--lime); font-style: normal; }
.primary-nav { display: flex; align-items: center; gap: 18px; margin-left: auto; }
.primary-nav a {
  position: relative;
  padding: 8px 0;
  color: rgba(255,255,255,.78);
  font-size: 14px;
  transition: color .18s var(--ease-out);
}
.primary-nav a::after {
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--lime);
  content: "";
  transition: width .18s var(--ease-out);
}
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--white); }
.primary-nav a:hover::after, .primary-nav a[aria-current="page"]::after { width: 100%; }
.menu-button { display: none; background: transparent; color: var(--white); font-size: 21px; }

.search-strip {
  border-top: 1px solid rgba(255,255,255,.07);
  background: rgba(21,30,74,.92);
}
.search-wrap {
  width: min(1240px, calc(100% - 40px));
  min-height: 48px;
  margin: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-wrap label { color: var(--aqua); font-size: 12px; font-weight: 800; letter-spacing: .10em; }
.search-form { display: flex; flex: 1; max-width: 560px; }
.search-form input {
  width: 100%;
  height: 32px;
  padding: 0 12px;
  border: 1px solid rgba(255,255,255,.20);
  border-radius: 7px 0 0 7px;
  outline: none;
  background: rgba(255,255,255,.06);
  color: var(--white);
  font-size: 13px;
}
.search-form input:focus { border-color: var(--aqua); }
.search-form button {
  min-width: 62px;
  border-radius: 0 7px 7px 0;
  background: var(--aqua);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}
.search-form button:active, .btn:active, .icon-button:active { transform: scale(.97); }
.search-result { min-height: 1em; margin-left: auto; color: rgba(255,255,255,.7); font-size: 12px; }

.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 88px 0; }
.section-dark { background: var(--ink); color: var(--white); }
.section-paper { background: var(--paper); }
.section-tint { background: #e9edff; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 12px;
  color: #4152ab;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .16em;
}
.eyebrow::before { width: 26px; height: 2px; background: var(--coral); content: ""; }
.section-dark .eyebrow { color: var(--aqua); }
.section-title {
  max-width: 770px;
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.15;
  letter-spacing: -.055em;
}
.section-title b { color: #5367d7; }
.section-dark .section-title b { color: var(--lime); }
.section-desc {
  max-width: 720px;
  margin: 18px 0 0;
  color: #58628b;
  font-size: 16px;
  line-height: 1.85;
}
.section-dark .section-desc { color: #b6c0e9; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 38px; }
.section-head > div { max-width: 780px; }

.hero {
  position: relative;
  min-height: 640px;
  overflow: hidden;
  isolation: isolate;
  background: var(--ink);
  color: var(--white);
}
.hero::after {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(7,12,37,.97) 0%, rgba(7,12,37,.84) 35%, rgba(7,12,37,.1) 69%, rgba(7,12,37,.1) 100%);
  content: "";
}
.hero-media { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-inner { width: min(1180px, calc(100% - 40px)); margin: auto; padding: 90px 0 94px; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 8px 12px;
  border: 1px solid rgba(214,255,85,.32);
  border-radius: 999px;
  background: rgba(214,255,85,.10);
  color: var(--lime);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
}
.hero-kicker::before { width: 7px; height: 7px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 5px rgba(214,255,85,.13); content: ""; }
.hero h1 { max-width: 710px; margin: 0; font-size: clamp(45px, 7vw, 79px); line-height: 1.01; letter-spacing: -.08em; }
.hero h1 span { color: var(--aqua); }
.hero h1 strong { color: var(--lime); font-weight: inherit; }
.hero-lead { max-width: 570px; margin: 26px 0 0; color: #d6dcff; font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .16s var(--ease-out), background .16s var(--ease-out), border-color .16s var(--ease-out);
}
.btn-primary { background: var(--lime); color: var(--ink); }
.btn-primary:hover { background: #e6ff91; transform: translateY(-2px); }
.btn-secondary { border-color: rgba(255,255,255,.34); background: rgba(255,255,255,.08); color: var(--white); }
.btn-secondary:hover { border-color: var(--aqua); background: rgba(70,232,210,.12); transform: translateY(-2px); }
.btn-dark { background: var(--ink); color: var(--white); }
.btn-dark:hover { background: var(--panel-soft); transform: translateY(-2px); }
.hero-facts { display: flex; flex-wrap: wrap; gap: 20px 34px; margin-top: 56px; }
.hero-fact { min-width: 140px; padding-left: 13px; border-left: 2px solid var(--aqua); }
.hero-fact b { display: block; color: var(--white); font-size: 21px; letter-spacing: -.04em; }
.hero-fact span { display: block; margin-top: 4px; color: #a7b2df; font-size: 12px; }

.brand-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
  padding: 21px 0;
  border-bottom: 1px solid #d9def7;
  color: #6570a0;
  font-size: 13px;
}
.brand-line strong { color: var(--ink); }
.brand-line span { display: inline-flex; align-items: center; gap: 8px; }
.brand-line i { width: 6px; height: 6px; border-radius: 50%; background: var(--coral); }
.freshness-line { padding: 16px 0; border-bottom: 1px solid #d9def7; color: #5d6995; font-size: 12px; }
.freshness-line span:first-child { color: var(--ink); font-weight: 800; }
.freshness-line time { color: #3c4dac; font-weight: 800; }

.feature-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.feature-card {
  position: relative;
  grid-column: span 4;
  min-height: 282px;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: 0 12px 28px rgba(42,54,112,.11);
}
.feature-card:nth-child(1) { grid-column: span 7; }
.feature-card:nth-child(2) { grid-column: span 5; }
.feature-card img { width: 100%; height: 100%; object-fit: cover; }
.feature-card::after { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 35%, rgba(8,13,38,.85)); content: ""; }
.feature-copy { position: absolute; right: 20px; bottom: 18px; left: 20px; z-index: 1; color: var(--white); }
.feature-copy .tag { display: inline-flex; margin-bottom: 8px; padding: 4px 8px; border-radius: 5px; background: rgba(70,232,210,.18); color: var(--aqua); font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.feature-copy h3 { margin: 0; font-size: 22px; letter-spacing: -.04em; }
.feature-copy p { margin: 7px 0 0; color: #d7ddfb; font-size: 13px; line-height: 1.6; }
.feature-card:hover img { transform: scale(1.04); }
.feature-card img { transition: transform .45s var(--ease-out); }

.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.service-card { min-height: 224px; padding: 24px; border: 1px solid #dce2ff; border-radius: var(--radius-md); background: var(--white); }
.service-card .service-no { color: #8795e2; font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.service-card h3 { margin: 28px 0 10px; color: var(--ink); font-size: 19px; letter-spacing: -.04em; }
.service-card p { margin: 0; color: #5e698f; font-size: 13px; line-height: 1.75; }
.service-card a { display: inline-block; margin-top: 16px; color: #3d4ebd; font-size: 13px; font-weight: 800; }
.service-card:hover { border-color: var(--aqua); box-shadow: 0 14px 30px rgba(54,77,164,.12); transform: translateY(-4px); }
.service-card { transition: transform .2s var(--ease-out), border-color .2s var(--ease-out), box-shadow .2s var(--ease-out); }

.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.video-card {
  position: relative;
  min-height: 322px;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--panel);
  color: var(--white);
  cursor: pointer;
}
.video-card.tall { grid-row: span 2; min-height: 662px; }
.video-card::after { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 20%, rgba(8,13,38,.92)); content: ""; }
.video-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s var(--ease-out); }
.video-card:hover img { transform: scale(1.055); }
.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border: 1px solid rgba(255,255,255,.72);
  border-radius: 50%;
  background: rgba(11,17,48,.55);
  color: var(--white);
  font-size: 18px;
  opacity: 0;
  transform: translate(-50%,-42%) scale(.94);
  transition: opacity .2s var(--ease-out), transform .2s var(--ease-out), background .2s var(--ease-out);
}
.video-card:hover .play-button, .video-card:focus-within .play-button { opacity: 1; transform: translate(-50%,-50%) scale(1); }
.play-button:hover { background: var(--aqua); color: var(--ink); }
.video-info { position: absolute; right: 18px; bottom: 16px; left: 18px; z-index: 2; }
.video-info .video-meta { display: flex; flex-wrap: wrap; gap: 10px; color: #b9c4ed; font-size: 11px; }
.video-info h3 { margin: 8px 0 0; font-size: 19px; letter-spacing: -.04em; }
.video-info p { margin: 8px 0 0; color: #d4dcff; font-size: 12px; line-height: 1.6; }

.ai-layout { display: grid; grid-template-columns: 1.02fr .98fr; gap: 44px; align-items: center; }
.ai-visual { position: relative; overflow: hidden; border-radius: 24px; box-shadow: var(--shadow); }
.ai-visual img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.ai-badge { position: absolute; right: 18px; bottom: 18px; padding: 12px 14px; border-radius: 12px; background: rgba(11,17,48,.88); color: var(--white); font-size: 12px; backdrop-filter: blur(10px); }
.ai-badge b { display: block; margin-bottom: 3px; color: var(--aqua); font-size: 18px; }
.capability-list { display: grid; gap: 10px; margin: 26px 0 0; padding: 0; list-style: none; }
.capability-list li { display: grid; grid-template-columns: 32px 1fr; gap: 12px; padding: 13px 0; border-bottom: 1px solid #dbe1fb; }
.capability-list b { display: grid; width: 29px; height: 29px; place-items: center; border-radius: 9px; background: #dfe6ff; color: #3e4caa; font-size: 12px; }
.capability-list strong { display: block; color: var(--ink); font-size: 15px; }
.capability-list span { display: block; margin-top: 5px; color: #657096; font-size: 13px; line-height: 1.6; }

.stat-band { background: var(--panel); color: var(--white); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,255,255,.16); }
.stat { padding: 32px 26px; background: var(--panel); }
.stat b { display: block; color: var(--lime); font-size: 35px; line-height: 1; letter-spacing: -.06em; }
.stat span { display: block; margin-top: 9px; color: #b9c4ed; font-size: 13px; }

.expert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.expert-card { padding: 28px; border-radius: var(--radius-md); background: rgba(255,255,255,.07); }
.expert-card .expert-role { color: var(--aqua); font-size: 12px; font-weight: 900; letter-spacing: .12em; }
.expert-card h3 { margin: 18px 0 4px; font-size: 24px; letter-spacing: -.05em; }
.expert-card .expert-title { color: #b7c1e9; font-size: 13px; }
.expert-card p { min-height: 65px; margin: 19px 0 0; color: #cad3f5; font-size: 13px; line-height: 1.75; }
.expert-credentials { display: flex; flex-wrap: wrap; gap: 7px; margin: 18px 0 0; }
.expert-credentials span { padding: 5px 7px; border: 1px solid rgba(255,255,255,.18); border-radius: 5px; color: #d8dfff; font-size: 11px; }
.expert-actions { display: flex; gap: 8px; margin-top: 23px; }
.expert-actions a { padding: 8px 10px; border-radius: 6px; background: rgba(255,255,255,.10); color: var(--white); font-size: 12px; font-weight: 800; }
.expert-actions a:first-child { background: var(--lime); color: var(--ink); }

.community-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 20px; }
.community-copy { padding: 38px; border-radius: var(--radius-lg); background: var(--ink); color: var(--white); }
.community-copy .section-desc { color: #c4cef4; }
.community-copy .btn { margin-top: 26px; }
.community-image { overflow: hidden; border-radius: var(--radius-lg); }
.community-image img { width: 100%; height: 100%; min-height: 390px; object-fit: cover; }
.community-points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 25px; }
.community-point { padding: 16px; border-radius: 10px; background: rgba(255,255,255,.08); }
.community-point b { display: block; color: var(--lime); font-size: 20px; }
.community-point span { display: block; margin-top: 5px; color: #b9c4ed; font-size: 12px; line-height: 1.5; }

.logo-wall { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.logo-pill { display: grid; min-height: 76px; place-items: center; border: 1px solid #d8defa; border-radius: 11px; background: var(--white); color: #425196; font-size: 14px; font-weight: 900; letter-spacing: -.03em; }
.logo-pill span { color: var(--coral); }
.logo-pill:hover { border-color: var(--violet); color: var(--ink); }

.how-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; }
.how-card { position: relative; padding: 24px 20px; border-top: 2px solid var(--aqua); border-radius: 0 0 14px 14px; background: var(--white); box-shadow: 0 12px 24px rgba(34,51,115,.08); }
.how-card b { display: block; color: #5f70d0; font-size: 13px; letter-spacing: .12em; }
.how-card h3 { margin: 17px 0 8px; font-size: 18px; letter-spacing: -.04em; }
.how-card p { margin: 0; color: #677298; font-size: 13px; line-height: 1.7; }

.feedback-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feedback-card { padding: 23px; border: 1px solid #dce2fb; border-radius: 14px; background: var(--white); }
.feedback-card .quote { color: #4658c3; font-size: 26px; font-weight: 900; line-height: 1; }
.feedback-card p { min-height: 72px; margin: 12px 0 18px; color: #4d587d; font-size: 13px; line-height: 1.85; }
.feedback-card footer { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: #7a85ae; font-size: 12px; }
.feedback-card footer b { color: var(--ink); }
.disclosure { margin-top: 17px; color: #737fa9; font-size: 12px; line-height: 1.7; }

.faq-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
.faq-item { border: 1px solid #dce2fb; border-radius: 12px; background: var(--white); }
.faq-item summary { padding: 18px 48px 18px 19px; color: var(--ink); font-size: 15px; font-weight: 800; line-height: 1.5; cursor: pointer; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { position: absolute; right: 19px; color: #4c5fc2; content: "+"; font-size: 22px; font-weight: 400; }
.faq-item { position: relative; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { margin: 0; padding: 0 19px 18px; color: #657197; font-size: 13px; line-height: 1.8; }

.contact-panel { display: grid; grid-template-columns: 1.1fr .9fr; gap: 18px; }
.contact-info { padding: 38px; border-radius: var(--radius-lg); background: var(--ink); color: var(--white); }
.contact-info h2 { margin: 0; font-size: 31px; letter-spacing: -.06em; }
.contact-info > p { max-width: 620px; margin: 15px 0 28px; color: #bec8ef; font-size: 14px; line-height: 1.8; }
.contact-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.contact-list div { padding: 13px 0; border-top: 1px solid rgba(255,255,255,.14); }
.contact-list span { display: block; color: var(--aqua); font-size: 11px; font-weight: 900; letter-spacing: .12em; }
.contact-list b { display: block; margin-top: 6px; color: var(--white); font-size: 15px; }
.qr-area { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; padding: 26px; border-radius: var(--radius-lg); background: var(--white); box-shadow: 0 15px 35px rgba(43,57,120,.12); }
.qr-card { text-align: center; }
.qr-card img { width: 100%; max-width: 150px; margin: 4px auto 12px; padding: 8px; border: 1px solid #e3e7fa; border-radius: 10px; }
.qr-card b { display: block; color: var(--ink); font-size: 14px; }
.qr-card span { display: block; margin-top: 5px; color: #7783ad; font-size: 11px; line-height: 1.5; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.tag-cloud a { padding: 7px 10px; border-radius: 999px; background: #e1e6ff; color: #4657a7; font-size: 12px; transition: background .16s var(--ease-out), color .16s var(--ease-out); }
.tag-cloud a:hover { background: var(--ink); color: var(--aqua); }
.share-row { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; }
.share-row.spaced { margin-top: 30px; }
.section-spacer { height: 38px; }
.share-row span { margin-right: 3px; color: #63709d; font-size: 12px; font-weight: 800; }
.icon-button { padding: 8px 10px; border: 1px solid #d7ddf7; border-radius: 7px; background: var(--white); color: #4454a8; font-size: 12px; font-weight: 800; cursor: pointer; }
.icon-button:hover { border-color: var(--aqua); background: #edfffb; }

.breadcrumb { padding: 18px 0; background: #eef1ff; color: #6d78a3; font-size: 12px; }
.breadcrumb .container { display: flex; flex-wrap: wrap; gap: 7px; }
.breadcrumb a { color: #4658bb; }
.breadcrumb strong { color: var(--ink); }
.inner-hero { padding: 72px 0; background: var(--ink); color: var(--white); }
.inner-hero h1 { max-width: 760px; margin: 0; font-size: clamp(38px, 5vw, 62px); line-height: 1.08; letter-spacing: -.07em; }
.inner-hero h1 span { color: var(--lime); }
.inner-hero p { max-width: 680px; margin: 20px 0 0; color: #c4cef4; font-size: 16px; line-height: 1.85; }
.inner-hero .meta-line { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 26px; color: var(--aqua); font-size: 12px; font-weight: 800; }
.inner-grid { display: grid; grid-template-columns: minmax(0,1fr) 310px; gap: 42px; }
.article-body h2 { margin: 44px 0 16px; color: var(--ink); font-size: 28px; letter-spacing: -.05em; }
.article-body h3 { margin: 27px 0 10px; color: var(--ink); font-size: 20px; }
.article-body p, .article-body li { color: #576188; font-size: 15px; line-height: 1.9; }
.article-body ul { padding-left: 20px; }
.article-body blockquote { margin: 25px 0; padding: 18px 20px; border-left: 3px solid var(--aqua); background: #e9fffb; color: #244f58; font-size: 15px; line-height: 1.8; }
.sidebar-card { padding: 20px; border: 1px solid #dce2fb; border-radius: 14px; background: var(--white); }
.sidebar-card + .sidebar-card { margin-top: 14px; }
.sidebar-card h3 { margin: 0 0 13px; font-size: 16px; }
.sidebar-card a { display: block; padding: 10px 0; border-bottom: 1px solid #e6eaff; color: #5363ad; font-size: 13px; }
.sidebar-card a:last-child { border-bottom: none; }
.sidebar-card p { margin: 0; color: #69759f; font-size: 13px; line-height: 1.75; }

.table-wrap { overflow-x: auto; margin-top: 20px; border: 1px solid #dce2fb; border-radius: 12px; }
table { width: 100%; border-collapse: collapse; min-width: 630px; background: var(--white); }
th, td { padding: 14px 16px; border-bottom: 1px solid #e2e6fa; text-align: left; font-size: 13px; line-height: 1.6; }
th { background: #eef1ff; color: #334389; font-weight: 900; }
td { color: #58638a; }
tr:last-child td { border-bottom: none; }

.site-footer { background: #080d28; color: var(--white); }
.footer-top { display: grid; grid-template-columns: 1.55fr repeat(4,1fr); gap: 26px; padding: 58px 0 40px; }
.footer-brand p { max-width: 320px; margin: 14px 0 0; color: #aeb9e4; font-size: 13px; line-height: 1.8; }
.footer-col h3 { margin: 0 0 14px; color: var(--aqua); font-size: 12px; letter-spacing: .10em; }
.footer-col a, .footer-col span { display: block; padding: 5px 0; color: #c7d0f4; font-size: 13px; }
.footer-col a:hover { color: var(--lime); }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 13px; padding: 18px 0; border-top: 1px solid rgba(255,255,255,.12); color: #9da8d7; font-size: 12px; }
.footer-bottom b { color: var(--white); }
.toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 100;
  max-width: min(360px, calc(100% - 44px));
  padding: 13px 16px;
  border-radius: 9px;
  background: var(--lime);
  color: var(--ink);
  box-shadow: 0 14px 30px rgba(2,7,28,.28);
  font-size: 13px;
  font-weight: 800;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity .2s var(--ease-out), transform .2s var(--ease-out);
}
.toast.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 980px) {
  .primary-nav { gap: 12px; }
  .service-grid { grid-template-columns: repeat(2,1fr); }
  .ai-layout, .community-layout, .contact-panel { grid-template-columns: 1fr; }
  .feature-card:nth-child(1), .feature-card:nth-child(2), .feature-card { grid-column: span 6; }
  .video-grid { grid-template-columns: repeat(2,1fr); }
  .video-card.tall { grid-row: span 1; min-height: 322px; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: repeat(3,1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-top > :last-child { grid-column: auto; }
}

@media (max-width: 720px) {
  .header-wrap { width: min(100% - 28px, 1240px); min-height: 64px; gap: 13px; }
  .brand-logo { font-size: 18px; }
  .brand-logo img { width: 34px; height: 34px; }
  .menu-button { display: inline-grid; margin-left: auto; place-items: center; width: 36px; height: 36px; cursor: pointer; }
  .primary-nav { position: absolute; top: 64px; right: 0; left: 0; display: none; padding: 12px 16px 18px; border-bottom: 1px solid var(--line); background: #10183d; }
  .primary-nav.is-open { display: grid; }
  .primary-nav a { padding: 11px 0; }
  .search-wrap { width: min(100% - 28px, 1240px); }
  .search-wrap label { display: none; }
  .search-result { display: none; }
  .container, .hero-inner { width: min(100% - 28px, 1180px); }
  .section { padding: 60px 0; }
  .section-head { display: block; margin-bottom: 28px; }
  .hero { min-height: 600px; }
  .hero::after { background: linear-gradient(90deg, rgba(7,12,37,.96), rgba(7,12,37,.74) 75%, rgba(7,12,37,.35)); }
  .hero-inner { padding: 72px 0 58px; }
  .hero h1 { max-width: 430px; }
  .hero-lead { font-size: 15px; }
  .hero-facts { gap: 16px; margin-top: 36px; }
  .hero-fact { min-width: 120px; }
  .feature-grid, .video-grid, .expert-grid, .feedback-grid, .faq-list, .how-grid { grid-template-columns: 1fr; }
  .feature-card:nth-child(1), .feature-card:nth-child(2), .feature-card { grid-column: span 12; min-height: 260px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: unset; }
  .stat-grid { grid-template-columns: repeat(2,1fr); }
  .community-points { grid-template-columns: 1fr; }
  .logo-wall { grid-template-columns: repeat(2,1fr); }
  .contact-list { grid-template-columns: 1fr; }
  .qr-area { padding: 17px; }
  .inner-hero { padding: 52px 0; }
  .inner-grid { grid-template-columns: 1fr; gap: 28px; }
  .sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .sidebar-card + .sidebar-card { margin-top: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 27px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-top > :last-child { grid-column: auto; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 43px; }
  .hero-facts { display: grid; grid-template-columns: 1fr 1fr; }
  .hero-fact { min-width: unset; }
  .stat { padding: 24px 15px; }
  .stat b { font-size: 29px; }
  .qr-area { grid-template-columns: 1fr; }
  .sidebar { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}