/* 困困兔｜赛道编辑部：外部核心样式 */
:root {
  --ink: #0e1420;
  --panel: #121b29;
  --panel-2: #182436;
  --line: rgba(225, 237, 250, .14);
  --mist: #dce7f2;
  --muted: #9bacbd;
  --orange: #ff5d36;
  --orange-2: #ffb146;
  --ice: #75d0ff;
  --white: #f7fafc;
  --shadow: 0 26px 70px rgba(0, 0, 0, .22);
  --radius: 26px;
  --shell: min(1180px, calc(100% - 48px));
  --serif: ui-serif, Georgia, 'Noto Serif SC', serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--white); font-family: var(--sans); font-size: 16px; line-height: 1.65; overflow-x: hidden; }
body::selection { background: var(--orange); color: var(--white); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
button { cursor: pointer; }
video { display: block; width: 100%; height: 100%; object-fit: cover; }
h1, h2, h3, h4, p { margin: 0; }
h1, h2, h3 { line-height: 1.16; letter-spacing: -.035em; }
.layout-noise { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }
.shell { width: var(--shell); margin: 0 auto; }
.sr-only { 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: absolute; z-index: 99; left: 16px; top: -50px; background: var(--orange); color: #fff; padding: 10px 16px; border-radius: 10px; font-weight: 800; }
.skip-link:focus { top: 16px; }

/* Header and navigation */
.site-header { position: relative; z-index: 20; background: rgba(14, 20, 32, .96); border-bottom: 1px solid var(--line); }
.header-row { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand-lockup { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.site-mark { width: 42px; height: 42px; }
.site-wordmark { width: 116px; height: 35px; }
.site-nav { display: flex; align-items: center; justify-content: flex-end; gap: 3px; }
.site-nav a { position: relative; color: var(--mist); padding: 11px 12px; font-size: 14px; font-weight: 700; white-space: nowrap; border-radius: 12px; transition: color .2s ease, background .2s ease; }
.site-nav a::after { content: ''; position: absolute; left: 13px; right: 13px; bottom: 6px; height: 2px; background: var(--orange); transform: scaleX(0); transform-origin: left; transition: transform .2s ease; }
.site-nav a:hover, .site-nav a.is-active { color: #fff; background: rgba(255, 255, 255, .05); }
.site-nav a:hover::after, .site-nav a.is-active::after { transform: scaleX(1); }
.menu-toggle { display: none; border: 0; background: transparent; color: #fff; padding: 8px; }
.menu-toggle span { display: block; height: 2px; width: 24px; margin: 5px; background: var(--white); }
.menu-toggle b { display: none; }
.search-row { display: flex; align-items: center; gap: 14px; padding: 0 0 18px; }
.site-search { width: min(640px, 100%); height: 46px; display: flex; align-items: center; background: #0a1019; border: 1px solid rgba(255, 255, 255, .1); border-radius: 14px; overflow: hidden; transition: border-color .2s ease, box-shadow .2s ease; }
.site-search:focus-within { border-color: var(--orange); box-shadow: 0 0 0 4px rgba(255, 93, 54, .12); }
.search-symbol { padding: 0 10px 0 16px; color: var(--orange-2); font-size: 25px; line-height: 1; }
.site-search input { min-width: 0; flex: 1; background: transparent; border: 0; color: var(--white); outline: none; font-size: 14px; }
.site-search input::placeholder { color: #718297; }
.site-search button { align-self: stretch; border: 0; padding: 0 18px; color: #fff; background: var(--orange); font-weight: 800; font-size: 13px; }
.search-status { color: var(--muted); font-size: 12px; white-space: nowrap; }

/* Shared language */
.breadcrumb { display: flex; gap: 9px; align-items: center; min-height: 54px; color: var(--muted); font-size: 13px; }
.breadcrumb a { color: var(--ice); }
.eyebrow, .section-kicker { color: var(--orange-2); font-size: 12px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.kicker-dark { color: #152337; }
.section-intro { max-width: 690px; }
.section-intro h2 { font-size: clamp(30px, 4.6vw, 56px); margin: 8px 0 16px; }
.section-intro > p:not(.section-kicker) { color: var(--muted); max-width: 620px; }
.text-link { display: inline-flex; gap: 8px; align-items: center; margin-top: 22px; color: var(--orange-2); font-weight: 800; }
.text-link span { font-size: 18px; transition: transform .2s ease; }
.text-link:hover span { transform: translate(3px, -3px); }
.tag-pill { display: inline-flex; align-items: center; padding: 7px 11px; background: rgba(117, 208, 255, .11); border: 1px solid rgba(117, 208, 255, .2); color: var(--ice); border-radius: 999px; font-size: 12px; font-weight: 700; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.micro-heading { margin-top: 28px; color: #53677d; font-size: 12px; letter-spacing: .08em; }
.button-primary, .button-ghost { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 0 20px; border-radius: 14px; font-weight: 900; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button-primary { background: var(--orange); color: #fff; box-shadow: 0 12px 28px rgba(255, 93, 54, .26); }
.button-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 34px rgba(255, 93, 54, .38); }
.button-ghost { border: 1px solid rgba(255,255,255,.2); color: var(--white); }
.button-ghost:hover { background: rgba(255,255,255,.08); }
.section-space { padding: 108px 0; }
.section-space.tight { padding: 74px 0; }

/* Hero */
.hero { position: relative; isolation: isolate; min-height: 680px; overflow: hidden; border-bottom: 1px solid var(--line); background: #101724; }
.hero-media, .hero-media::after { position: absolute; inset: 0; }
.hero-media { z-index: -2; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-media::after { content: ''; background: linear-gradient(90deg, #101724 0%, rgba(16,23,36,.94) 27%, rgba(16,23,36,.34) 66%, rgba(16,23,36,.88) 100%), linear-gradient(0deg, #101724 0%, transparent 36%); }
.hero-grid { min-height: 680px; display: grid; grid-template-columns: minmax(0, 700px) 1fr; align-items: end; padding: 76px 0 70px; }
.hero-copy { max-width: 680px; }
.hero-kicker { display: inline-flex; align-items: center; gap: 10px; color: var(--orange-2); font-size: 13px; font-weight: 900; letter-spacing: .1em; }
.hero-kicker::before { content: ''; width: 36px; height: 2px; background: currentColor; }
.hero h1 { max-width: 680px; margin: 18px 0; font-size: clamp(46px, 7vw, 82px); }
.hero h1 strong { color: var(--orange); font-weight: 900; }
.hero-description { color: #d8e3ef; max-width: 610px; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-rail { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 44px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.16); }
.hero-rail strong { display: block; font-size: 22px; letter-spacing: -.04em; }
.hero-rail span { display: block; color: var(--muted); font-size: 12px; }
.hero-side-note { align-self: center; justify-self: end; width: 210px; padding: 18px; border: 1px solid rgba(255,255,255,.22); border-radius: 16px; background: rgba(8, 14, 23, .42); backdrop-filter: blur(12px); }
.hero-side-note .round { display: inline-flex; justify-content: center; align-items: center; width: 42px; height: 42px; margin-bottom: 14px; border-radius: 50%; background: var(--orange); color: #fff; font-weight: 900; }
.hero-side-note p { font-size: 13px; color: var(--mist); }

/* Video cards */
.video-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; margin-top: 44px; }
.video-card { grid-column: span 3; min-width: 0; }
.video-card.featured { grid-column: span 6; }
.video-frame { position: relative; aspect-ratio: 16 / 10; overflow: hidden; border-radius: 18px; background: #1c293a; box-shadow: inset 0 0 0 1px rgba(255,255,255,.08); }
.video-frame::after { content: ''; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(180deg, transparent 46%, rgba(6,10,16,.68)); }
.video-frame video { transition: transform .5s cubic-bezier(.2,.7,.2,1), filter .4s ease; filter: saturate(.88); }
.video-card:hover video, .video-card:focus-within video, .video-card.is-playing video { transform: scale(1.06); filter: saturate(1.14); }
.video-type, .video-duration { position: absolute; z-index: 2; top: 12px; padding: 5px 9px; background: rgba(5,10,17,.72); border: 1px solid rgba(255,255,255,.15); border-radius: 8px; color: #fff; font-size: 11px; font-weight: 800; backdrop-filter: blur(8px); }
.video-type { left: 12px; color: var(--orange-2); }
.video-duration { right: 12px; }
.play-button { position: absolute; z-index: 3; top: 50%; left: 50%; width: 58px; height: 58px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.7); border-radius: 50%; background: rgba(255,93,54,.9); color: #fff; transform: translate(-50%, -44%) scale(.83); opacity: 0; transition: opacity .2s ease, transform .2s ease; box-shadow: 0 8px 25px rgba(0,0,0,.25); }
.play-button span { margin-left: 3px; font-size: 18px; }
.video-card:hover .play-button, .video-card:focus-within .play-button, .video-card.is-playing .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.frame-corner { position: absolute; z-index: 2; width: 18px; height: 18px; opacity: 0; transition: opacity .2s ease; }
.corner-a { left: 10px; bottom: 10px; border-left: 2px solid var(--orange-2); border-bottom: 2px solid var(--orange-2); }
.corner-b { right: 10px; bottom: 10px; border-right: 2px solid var(--orange-2); border-bottom: 2px solid var(--orange-2); }
.video-card:hover .frame-corner, .video-card:focus-within .frame-corner { opacity: 1; }
.video-copy { padding: 15px 3px 0; }
.video-copy .eyebrow { margin-bottom: 6px; font-size: 10px; }
.video-copy h3 { min-height: 2.35em; font-size: 17px; letter-spacing: -.025em; }
.video-metrics { display: flex; flex-wrap: wrap; gap: 8px 11px; margin-top: 11px; color: var(--muted); font-size: 11px; }

/* Story, stats, media */
.story-band { position: relative; overflow: hidden; background: #dfe9f3; color: #132032; }
.story-band::before { content: 'KUN KUN TU'; position: absolute; top: -40px; right: -20px; color: rgba(19,32,50,.05); font-size: clamp(80px, 18vw, 280px); font-weight: 900; letter-spacing: -.09em; pointer-events: none; }
.story-layout { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(40px, 8vw, 110px); align-items: center; }
.story-layout h2 { max-width: 580px; font-size: clamp(34px, 5vw, 62px); }
.story-layout h2 em { color: var(--orange); font-style: normal; }
.story-layout p { max-width: 600px; margin-top: 18px; color: #3d5066; }
.stat-stack { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.stat-card { padding: 25px; background: rgba(255,255,255,.55); border: 1px solid rgba(19,32,50,.12); border-radius: 18px; }
.stat-card:nth-child(2) { transform: translateY(27px); background: #172437; color: #fff; }
.stat-card:nth-child(3) { transform: translateX(40px); }
.stat-card strong { display: block; font-size: clamp(27px, 4vw, 42px); letter-spacing: -.06em; }
.stat-card span { display: block; margin-top: 4px; color: inherit; opacity: .74; font-size: 13px; }
.feature-split { display: grid; grid-template-columns: .92fr 1.08fr; gap: clamp(32px, 6vw, 82px); align-items: center; }
.feature-image { position: relative; min-height: 470px; overflow: hidden; border-radius: var(--radius); }
.feature-image img { width: 100%; height: 100%; position: absolute; object-fit: cover; }
.feature-image::after { content: ''; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(6,12,20,.72), transparent 60%); }
.image-caption { position: absolute; z-index: 2; right: 20px; bottom: 20px; left: 20px; display: flex; justify-content: space-between; align-items: end; gap: 16px; color: #fff; }
.image-caption span { max-width: 250px; font-size: 13px; }
.image-caption b { color: var(--orange-2); font-size: 12px; letter-spacing: .1em; }
.feature-copy h2 { font-size: clamp(34px, 4vw, 54px); margin: 9px 0 16px; }
.feature-copy > p { color: var(--muted); }
.feature-list { display: grid; gap: 15px; margin: 27px 0 31px; }
.feature-list li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; list-style: none; color: var(--mist); }
.feature-list b { display: grid; place-items: center; height: 28px; border-radius: 8px; background: rgba(255,93,54,.14); color: var(--orange-2); font-size: 12px; }
.feature-list span { font-size: 14px; }

/* Mosaic content */
.mosaic { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; margin-top: 46px; }
.mosaic-card { position: relative; min-height: 250px; display: flex; flex-direction: column; justify-content: end; overflow: hidden; padding: 25px; border: 1px solid var(--line); border-radius: 20px; background: var(--panel); }
.mosaic-card::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 80% 0, rgba(255,93,54,.22), transparent 46%); }
.mosaic-card > * { position: relative; }
.mosaic-card.large { grid-column: span 5; min-height: 340px; }
.mosaic-card.medium { grid-column: span 4; }
.mosaic-card.small { grid-column: span 3; }
.mosaic-card .symbol { display: grid; place-items: center; position: absolute; top: 24px; right: 24px; width: 46px; height: 46px; border: 1px solid rgba(255,255,255,.16); border-radius: 50%; color: var(--orange-2); font-weight: 900; }
.mosaic-card h3 { max-width: 290px; font-size: 25px; }
.mosaic-card p { max-width: 330px; margin-top: 12px; color: var(--muted); font-size: 14px; }
.mosaic-card .tag-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 20px; }

/* Community, people, partner */
.community-stripe { overflow: hidden; padding: 18px 0; background: var(--orange); color: #fff; }
.stripe-track { display: flex; gap: 40px; width: max-content; font-weight: 900; letter-spacing: .06em; animation: ticker 26s linear infinite; }
.stripe-track span::before { content: '✦'; margin-right: 12px; color: #1a2433; }
@keyframes ticker { to { transform: translateX(-28%); } }
.community-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 42px; align-items: start; }
.community-nav { position: sticky; top: 18px; display: grid; gap: 8px; }
.community-nav a { display: flex; justify-content: space-between; padding: 15px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-weight: 800; }
.community-nav a:hover { color: var(--orange-2); }
.community-panels { display: grid; gap: 16px; }
.topic-panel { display: grid; grid-template-columns: auto 1fr auto; gap: 18px; align-items: center; padding: 21px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(110deg, rgba(255,255,255,.04), transparent); }
.topic-number { color: var(--orange); font-family: var(--serif); font-size: 36px; font-style: italic; }
.topic-panel h3 { font-size: 19px; }
.topic-panel p { margin-top: 6px; color: var(--muted); font-size: 13px; }
.topic-panel a { color: var(--ice); font-size: 13px; font-weight: 800; }
.expert-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: 44px; }
.expert-card { display: flex; flex-direction: column; min-height: 330px; padding: 19px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.expert-initial { display: grid; place-items: center; width: 54px; height: 54px; margin-bottom: auto; border-radius: 50%; background: linear-gradient(135deg, #293a51, #111a29); color: var(--orange-2); font-size: 20px; font-weight: 900; }
.expert-card h3 { margin-top: 30px; font-size: 21px; }
.expert-role { margin-top: 4px; color: var(--orange-2); font-size: 12px; font-weight: 800; }
.expert-card > p:not(.expert-role) { margin-top: 12px; color: var(--muted); font-size: 12px; }
.expert-meta { margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--mist); font-size: 11px; }
.expert-actions { display: flex; gap: 9px; margin-top: 14px; }
.expert-actions a { padding: 7px 9px; border: 1px solid rgba(255,255,255,.18); border-radius: 7px; font-size: 11px; font-weight: 800; }
.expert-actions a:first-child { border-color: rgba(255,93,54,.6); color: var(--orange-2); }
.partner-wall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-top: 34px; }
.partner { min-height: 90px; display: grid; place-items: center; padding: 12px; border: 1px solid rgba(19,32,50,.14); background: rgba(255,255,255,.5); color: #263a50; font-size: 13px; font-weight: 900; letter-spacing: .04em; }
.partner::before { content: '◈'; color: var(--orange); margin-right: 6px; }

/* How-to, testimonials, FAQ */
.howto-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 42px; }
.howto-card { position: relative; overflow: hidden; min-height: 270px; padding: 25px; border: 1px solid var(--line); border-radius: 20px; background: #101b2a; }
.howto-card::before { content: attr(data-step); position: absolute; right: 18px; top: 4px; color: rgba(255,255,255,.05); font-size: 110px; font-weight: 900; line-height: 1; }
.howto-number { display: inline-grid; place-items: center; width: 35px; height: 35px; border-radius: 50%; background: var(--orange); color: #fff; font-weight: 900; }
.howto-card h3 { margin-top: 26px; font-size: 24px; }
.howto-card p { margin-top: 11px; color: var(--muted); font-size: 14px; }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 45px; }
.review-card { padding: 24px; border-radius: 18px; background: #e6eef5; color: #132032; }
.review-card:nth-child(even) { background: #ffc06b; }
.review-card .stars { color: var(--orange); font-size: 13px; letter-spacing: 2px; }
.review-card blockquote { margin: 18px 0; font-size: 16px; font-weight: 800; line-height: 1.6; }
.review-card footer { font-size: 12px; color: #4c6176; }
.review-card footer b { color: #132032; }
.faq-wrap { display: grid; grid-template-columns: .75fr 1.25fr; gap: 60px; align-items: start; }
.faq-list { display: grid; gap: 10px; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; gap: 16px; list-style: none; padding: 18px 0; font-weight: 850; cursor: pointer; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before { content: '+'; color: var(--orange); font-size: 24px; line-height: .85; }
.faq-list details[open] summary::before { content: '−'; }
.faq-list p { padding: 0 0 20px 37px; color: var(--muted); font-size: 14px; }

/* Contact and share */
.contact-panel { position: relative; overflow: hidden; padding: clamp(28px, 5vw, 62px); border-radius: 28px; background: linear-gradient(118deg, #e75d3a, #ff9a45); color: #fff; }
.contact-panel::after { content: '困困兔'; position: absolute; right: -10px; bottom: -50px; color: rgba(255,255,255,.11); font-size: clamp(90px, 15vw, 210px); font-weight: 900; letter-spacing: -.09em; }
.contact-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.25fr .75fr; gap: 52px; }
.contact-panel h2 { font-size: clamp(35px, 5vw, 62px); }
.contact-panel h2 span { color: #152337; }
.contact-panel p { margin-top: 15px; max-width: 640px; color: rgba(255,255,255,.88); }
.contact-actions { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 27px; }
.contact-panel .button-primary { color: #152337; background: #fff; box-shadow: none; }
.contact-panel .button-ghost { border-color: rgba(255,255,255,.6); }
.contact-facts { display: grid; gap: 12px; align-content: center; }
.contact-fact { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.35); }
.contact-fact span { display: block; font-size: 11px; letter-spacing: .12em; opacity: .72; }
.contact-fact b { display: block; margin-top: 2px; font-size: 16px; }
.share-row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 25px; }
.share-row button { border: 1px solid var(--line); border-radius: 999px; padding: 9px 13px; background: rgba(14,20,32,.35); color: #fff; font-size: 12px; font-weight: 800; }
.share-row button:hover { border-color: rgba(255,255,255,.8); }

/* Inner page modules */
.inner-hero { position: relative; overflow: hidden; padding: 72px 0 82px; border-bottom: 1px solid var(--line); background: linear-gradient(120deg, #101a28 0%, #17273a 65%, #2a1d1a 100%); }
.inner-hero::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px); background-size: 36px 36px; mask-image: linear-gradient(90deg, #000, transparent); }
.inner-hero > .shell { position: relative; }
.inner-hero h1 { max-width: 800px; margin-top: 12px; font-size: clamp(42px, 6.5vw, 70px); }
.inner-hero p:not(.section-kicker) { max-width: 680px; margin-top: 17px; color: var(--mist); font-size: 17px; }
.inner-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 23px; }
.editorial-list { display: grid; gap: 16px; margin-top: 42px; }
.editorial-row { display: grid; grid-template-columns: 110px 1.1fr .8fr auto; gap: 20px; align-items: center; padding: 20px 0; border-top: 1px solid var(--line); }
.editorial-row:last-child { border-bottom: 1px solid var(--line); }
.editorial-row .index { color: var(--orange); font-family: var(--serif); font-size: 38px; font-style: italic; }
.editorial-row h3 { font-size: 20px; }
.editorial-row p { color: var(--muted); font-size: 13px; }
.editorial-row .metrics-single { color: var(--ice); font-size: 12px; font-weight: 800; }
.timeline { position: relative; display: grid; gap: 0; margin-top: 45px; }
.timeline::before { content: ''; position: absolute; left: 18px; top: 0; bottom: 0; width: 1px; background: var(--line); }
.timeline-item { position: relative; display: grid; grid-template-columns: 92px 1fr; gap: 20px; padding: 0 0 32px; }
.timeline-dot { position: relative; z-index: 1; display: grid; place-items: center; width: 37px; height: 37px; border-radius: 50%; background: var(--orange); color: #fff; font-size: 11px; font-weight: 900; }
.timeline-item h3 { font-size: 23px; }
.timeline-item p { margin-top: 8px; color: var(--muted); }
.note-panel { padding: 25px; border-left: 4px solid var(--orange); background: #192638; color: var(--mist); }
.note-panel b { color: var(--orange-2); }
.tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; margin-top: 40px; }
.tool-card { padding: 23px; border: 1px solid var(--line); border-radius: 17px; background: linear-gradient(160deg, rgba(255,255,255,.06), rgba(255,255,255,.015)); }
.tool-card .icon { font-size: 29px; color: var(--orange-2); }
.tool-card h3 { margin-top: 25px; font-size: 19px; }
.tool-card p { margin-top: 9px; color: var(--muted); font-size: 13px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: #0a1019; }
.footer-top { display: grid; grid-template-columns: 1.35fr .7fr 1fr .9fr; gap: 36px; padding: 58px 0 44px; }
.footer-brand p { max-width: 300px; margin-top: 17px; color: var(--muted); font-size: 13px; }
.footer-social { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.footer-social a { color: var(--ice); font-size: 12px; font-weight: 800; }
.footer-links, .footer-contact { display: grid; align-content: start; gap: 8px; }
.site-footer h2 { margin-bottom: 9px; font-size: 13px; color: var(--orange-2); letter-spacing: .08em; }
.footer-links a, .footer-contact p { color: var(--muted); font-size: 12px; }
.footer-contact strong, .footer-contact a { color: var(--mist); font-weight: 800; }
.footer-qr { display: flex; gap: 14px; }
.footer-qr figure { margin: 0; text-align: center; }
.footer-qr img { padding: 5px; background: #fff; }
.footer-qr figcaption { margin-top: 7px; color: var(--muted); font-size: 10px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 22px; padding: 19px 0 25px; border-top: 1px solid var(--line); color: #718297; font-size: 11px; }
.footer-note { max-width: 400px; text-align: right; }
.toast { position: fixed; z-index: 100; left: 50%; bottom: 25px; padding: 11px 16px; border: 1px solid rgba(255,255,255,.17); border-radius: 12px; background: #eef5fc; color: #172437; box-shadow: var(--shadow); font-size: 13px; font-weight: 800; transform: translate(-50%, 120px); opacity: 0; transition: transform .25s ease, opacity .25s ease; }
.toast.is-visible { transform: translate(-50%, 0); opacity: 1; }

/* Responsive */
@media (max-width: 1020px) {
  .site-nav a { padding: 10px 8px; font-size: 12px; }
  .search-status { display: none; }
  .video-card { grid-column: span 6; }
  .video-card.featured { grid-column: span 6; }
  .expert-grid { grid-template-columns: repeat(3, 1fr); }
  .partner-wall { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1.3fr .7fr 1fr; }
  .footer-qr { grid-column: span 3; }
}
@media (max-width: 760px) {
  :root { --shell: min(100% - 32px, 620px); }
  .site-header { position: sticky; top: 0; background: rgba(14,20,32,.97); backdrop-filter: blur(12px); }
  .header-row { min-height: 66px; }
  .site-mark { width: 36px; height: 36px; }
  .site-wordmark { width: 101px; height: 31px; }
  .menu-toggle { display: block; }
  .site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 63px; padding: 11px; border: 1px solid var(--line); border-radius: 15px; background: #111a28; box-shadow: var(--shadow); }
  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 12px; font-size: 14px; }
  .search-row { padding-bottom: 12px; }
  .site-search { height: 42px; }
  .site-search button { padding: 0 12px; font-size: 11px; }
  .hero, .hero-grid { min-height: 620px; }
  .hero-grid { display: block; padding: 70px 0 42px; }
  .hero h1 { font-size: clamp(42px, 13vw, 62px); }
  .hero-description { font-size: 16px; }
  .hero-side-note { display: none; }
  .hero-rail { margin-top: 32px; gap: 12px 18px; }
  .hero-rail strong { font-size: 19px; }
  .section-space { padding: 72px 0; }
  .section-space.tight { padding: 56px 0; }
  .video-grid { gap: 24px 12px; margin-top: 31px; }
  .video-card, .video-card.featured { grid-column: span 6; }
  .video-copy h3 { font-size: 15px; }
  .story-layout, .feature-split, .community-layout, .faq-wrap, .contact-grid { grid-template-columns: 1fr; gap: 33px; }
  .stat-stack { max-width: 430px; }
  .stat-card:nth-child(3) { transform: none; }
  .feature-image { min-height: 330px; order: -1; }
  .mosaic-card.large, .mosaic-card.medium, .mosaic-card.small { grid-column: span 12; min-height: 230px; }
  .community-nav { position: static; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
  .topic-panel { grid-template-columns: auto 1fr; }
  .topic-panel a { grid-column: 2; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); gap: 11px; }
  .expert-card { min-height: 300px; }
  .partner-wall { grid-template-columns: repeat(2, 1fr); }
  .howto-grid, .review-grid, .tool-grid { grid-template-columns: 1fr; }
  .review-card { padding: 21px; }
  .inner-hero { padding: 55px 0 62px; }
  .editorial-row { grid-template-columns: 60px 1fr; gap: 12px; }
  .editorial-row p, .editorial-row .metrics-single { grid-column: 2; }
  .timeline-item { grid-template-columns: 55px 1fr; gap: 14px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 30px 21px; }
  .footer-brand { grid-column: span 2; }
  .footer-qr { grid-column: span 2; }
  .footer-bottom { display: block; }
  .footer-note { margin-top: 8px; text-align: left; }
}
@media (max-width: 430px) {
  .video-card, .video-card.featured { grid-column: span 12; }
  .hero-actions { display: grid; }
  .button-primary, .button-ghost { width: 100%; }
  .expert-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-brand, .footer-qr { grid-column: auto; }
  .footer-qr { justify-content: start; }
  .community-nav { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}