:root {
    --bg: #F3F7FB;
    --bg-deep: #E6EFF7;
    --surface: #FFFFFF;
    --surface-alt: #DCEBF5;
    --ink: #10263A;
    --text: #263B4C;
    --muted: #60788C;
    --soft: #8094A5;
    --blue: #3B9FE0;
    --blue-bright: #67B9EC;
    --steel: #1E6FB8;
    --ice: #B8DDF3;
    --mint: #39A69C;
    --border: rgba(30,111,184,0.16);
    --border-strong: rgba(59,159,224,0.38);
    --shadow: 0 14px 36px rgba(16,38,58,0.08);
    --radius: 14px;
    --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
    margin: 0;
    min-width: 0;
    overflow-x: hidden;
    color: var(--text);
    background:
        radial-gradient(circle at 9% 6%, rgba(103,185,236,.14), transparent 24rem),
        linear-gradient(180deg, #F8FBFD 0, var(--bg) 22rem, var(--bg) 100%);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.8;
}
body.is-locked { overflow: hidden; }
img { max-width: 100%; }
a { color: var(--steel); text-decoration: none; }
a:hover { color: #155A95; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible {
    outline: 3px solid rgba(59,159,224,.32);
    outline-offset: 3px;
}
button, input { font: inherit; }
button { cursor: pointer; }

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--border);
    background: rgba(248,251,253,.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 7px 24px rgba(16,38,58,.06);
}
.topbar-inner {
    width: min(calc(100% - 32px), var(--max));
    min-height: 72px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 14px;
}
.brand-link { display: inline-flex; align-items: center; min-height: 44px; max-width: 220px; }
.brand-link img, .footer-logo-link img, .panel-brand img { display: block; height: 34px; width: auto; max-width: 180px; object-fit: contain; }
.brand-text { color: var(--ink); font-size: 21px; font-weight: 800; letter-spacing: .02em; }
.brand-status { color: var(--muted); font-size: 14px; white-space: nowrap; }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.icon-button, .top-app-link, .close-button, .side-all-button {
    min-height: 44px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 15px;
    color: var(--steel);
    background: rgba(255,255,255,.9);
    font-weight: 700;
}
.icon-button:hover, .top-app-link:hover, .close-button:hover, .side-all-button:hover { background: #EDF6FC; color: #144F80; }
.menu-button { background: linear-gradient(135deg,var(--blue-bright),var(--blue) 52%,var(--steel)); color: #fff; border-color: transparent; }
.menu-button:hover { color: #fff; filter: brightness(.97); }

.site-main { padding: 34px 0 76px; }
.site-shell {
    width: min(calc(100% - 32px), var(--max));
    margin: 0 auto;
    display: grid;
    grid-template-columns: 220px minmax(0,1fr);
    gap: 30px;
    align-items: start;
}
.content-column { min-width: 0; }
.side-rail { position: sticky; top: 96px; }
.side-rail-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(255,255,255,.9);
    box-shadow: var(--shadow);
    padding: 18px;
}
.side-group + .side-group { margin-top: 19px; padding-top: 18px; border-top: 1px solid var(--border); }
.side-group h2 { margin: 0; color: var(--ink); font-size: 15px; line-height: 1.4; }
.side-group p { margin: 7px 0 9px; color: var(--soft); font-size: 12px; line-height: 1.55; }
.side-group nav { display: grid; gap: 4px; }
.side-group nav a {
    display: flex;
    min-height: 38px;
    align-items: center;
    padding: 7px 9px;
    border-left: 3px solid transparent;
    border-radius: 8px;
    color: var(--muted);
    font-size: 14px;
}
.side-group nav a:hover { background: #F2F8FC; color: var(--ink); }
.side-group nav a.is-current { border-left-color: var(--steel); background: #E7F3FB; color: var(--ink); font-weight: 800; }
.side-all-button { width: 100%; margin-top: 18px; }

.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--soft); font-size: 14px; margin-bottom: 14px; }
.breadcrumb a { color: var(--steel); }
.page-hero {
    border: 1px solid var(--border);
    background: linear-gradient(135deg,rgba(255,255,255,.96),rgba(220,235,245,.72));
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: clamp(24px, 4vw, 46px);
    margin-bottom: 28px;
    overflow: hidden;
}
.eyebrow { display: inline-block; color: var(--steel); font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { margin: 9px 0 14px; color: var(--ink); font-size: clamp(30px,4vw,38px); line-height: 1.2; letter-spacing: -.02em; }
h2 { color: var(--ink); font-size: clamp(22px,3vw,28px); line-height: 1.32; }
h3 { color: var(--ink); line-height: 1.4; }
p { margin: 0 0 1em; }
.lead { max-width: 840px; color: #365064; font-size: 18px; line-height: 1.85; }
.hero-actions, .section-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.button-primary, .button-secondary {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 11px;
    padding: 0 17px;
    font-weight: 800;
}
.button-primary { color: #fff; background: linear-gradient(135deg,var(--blue-bright),var(--blue) 52%,var(--steel)); box-shadow: 0 9px 24px rgba(30,111,184,.22); }
.button-primary:hover { color: #fff; filter: brightness(.97); }
.button-secondary { color: var(--steel); border: 1px solid var(--border-strong); background: #fff; }
.button-secondary:hover { background: #EEF7FC; }

.media-frame {
    margin: 0;
    min-height: 210px;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    background: linear-gradient(145deg,#F9FCFE,#DCEBF5);
    display: flex;
    align-items: center;
    justify-content: center;
}
.media-frame img { display: block; width: 100%; height: 100%; max-height: 360px; object-fit: contain; object-position: center; }
.media-frame.banner { min-height: 240px; max-height: 420px; }
.media-frame.banner img { height: auto; max-height: 420px; }
.media-frame.compact { min-height: 190px; }
.media-frame.portrait { min-height: 320px; max-height: 460px; }
.media-frame.portrait img { max-height: 460px; width: 100%; height: 100%; object-fit: contain; }
.media-frame.icon-frame { width: 72px; height: 72px; min-height: 72px; border-radius: 18px; flex: 0 0 72px; }
.media-frame.icon-frame img { width: 100%; height: 100%; object-fit: contain; }
.media-fallback {
    width: 100%; min-height: inherit; align-self: stretch;
    display: grid; place-items: center; padding: 28px;
    background:
        linear-gradient(135deg,rgba(103,185,236,.18),rgba(57,166,156,.08)),
        repeating-linear-gradient(0deg,transparent 0 23px,rgba(30,111,184,.045) 24px);
    color: var(--steel); text-align: center; font-weight: 800; letter-spacing: .04em;
}

.section-block { margin: 30px 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin-bottom: 16px; }
.section-heading h2 { margin: 0; }
.section-heading p { margin: 0; max-width: 620px; color: var(--muted); }
.card-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
.card-grid.two { grid-template-columns: repeat(2,minmax(0,1fr)); }
.info-card, .text-card, .article-card, .rule-card, .task-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 20px;
    box-shadow: 0 8px 24px rgba(16,38,58,.045);
}
.info-card h3, .text-card h3, .article-card h3, .rule-card h3, .task-card h3 { margin: 0 0 8px; font-size: 19px; }
.info-card p, .text-card p, .article-card p, .rule-card p, .task-card p { color: #415B70; }
.kicker { color: var(--steel); font-weight: 800; font-size: 13px; letter-spacing: .08em; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tag-row span { background: #EAF4FA; color: #365E7C; border: 1px solid var(--border); border-radius: 9px; padding: 4px 9px; font-size: 13px; }
.inline-link { font-weight: 800; }

.split-layout { display: grid; grid-template-columns: minmax(0,1.05fr) minmax(280px,.95fr); gap: 22px; align-items: center; }
.split-layout.reverse > :first-child { order: 2; }
.split-layout.reverse > :last-child { order: 1; }
.prose-card { padding: clamp(22px,3vw,34px); border: 1px solid var(--border); border-radius: 16px; background: #fff; }
.prose-card h2 { margin-top: 0; }
.prose-card p:last-child { margin-bottom: 0; }

.related-section { margin-top: 34px; padding-top: 26px; border-top: 1px solid var(--border); }
.related-section h2 { margin-top: 0; }
.related-links { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; }
.related-links a { display: block; min-height: 108px; padding: 16px; border-radius: 12px; border: 1px solid var(--border); background: #fff; }
.related-links strong, .related-links span { display: block; }
.related-links strong { color: var(--ink); margin-bottom: 5px; }
.related-links span { color: var(--muted); font-size: 14px; }
.page-cta { margin-top: 28px; border-radius: 16px; padding: 24px; background: linear-gradient(135deg,#DDEEF8,#F8FCFE); border: 1px solid var(--border); }
.page-cta h2 { margin: 0 0 8px; }

/* 首页 */
.home-cover .media-frame { margin-bottom: 22px; }
.home-cover-copy { padding: 0 4px; }
.home-cover-copy h1 { max-width: 860px; }
.home-cover-copy .lead { max-width: 880px; }
.task-strip { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 14px; }
.task-card { position: relative; overflow: hidden; min-height: 210px; }
.task-card .task-number { color: rgba(30,111,184,.22); font-size: 46px; font-weight: 900; line-height: 1; }
.task-card.has-image { padding: 0; }
.task-card.has-image .media-frame { border: 0; border-radius: 0; min-height: 120px; }
.task-card.has-image .task-copy { padding: 18px; }
.editor-board { display: grid; grid-template-columns: 1.35fr .85fr; grid-template-rows: auto auto; gap: 16px; }
.editor-board .main-read { grid-row: 1 / span 2; }
.editor-board .main-read .media-frame { margin-bottom: 16px; }
.editor-board .board-card { border: 1px solid var(--border); border-radius: 16px; background: #fff; padding: 20px; }
.channel-band { display: grid; grid-template-columns: minmax(280px,.9fr) minmax(0,1.1fr); gap: 22px; align-items: center; padding: 18px; border: 1px solid var(--border); border-radius: 16px; background: #fff; }
.channel-band + .channel-band { margin-top: 16px; }
.channel-band.reverse .media-frame { order: 2; }
.channel-band.reverse .channel-copy { order: 1; }
.channel-copy h3 { font-size: 24px; margin: 0 0 8px; }
.people-craft { display: grid; grid-template-columns: minmax(300px,.9fr) minmax(0,1.1fr); gap: 20px; }
.node-list { display: grid; gap: 12px; }
.node-item { border-left: 4px solid var(--steel); border-radius: 0 12px 12px 0; background: #fff; padding: 16px 18px; border-top: 1px solid var(--border); border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.node-item h3 { margin: 0 0 5px; font-size: 18px; }
.topic-mosaic { display: grid; grid-template-columns: repeat(12,1fr); grid-auto-rows: minmax(132px,auto); gap: 12px; }
.topic-tile { border-radius: 15px; padding: 20px; border: 1px solid var(--border); color: var(--ink); background: #EAF4FA; }
.topic-tile:nth-child(1), .topic-tile:nth-child(5) { grid-column: span 7; }
.topic-tile:nth-child(2), .topic-tile:nth-child(6) { grid-column: span 5; }
.topic-tile:nth-child(3), .topic-tile:nth-child(4) { grid-column: span 6; }
.topic-tile:nth-child(2n) { background: #E4F3F0; }
.topic-tile .topic-no { color: var(--steel); font-weight: 900; letter-spacing: .12em; }
.topic-tile h3 { margin: 9px 0 6px; }
.collection-split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 18px; }
.shelf-panel, .list-panel { border: 1px solid var(--border); background: #fff; border-radius: 16px; padding: 20px; }
.shelf-slots { display: grid; gap: 10px; margin-top: 14px; }
.shelf-slot { display: grid; grid-template-columns: 92px 1fr; gap: 14px; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--border); }
.shelf-slot:last-child { border-bottom: 0; }
.shelf-slot strong { color: var(--steel); }
.number-list { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 12px; }
.number-list li { display: grid; grid-template-columns: 58px 1fr; gap: 12px; align-items: start; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.number-list li:last-child { border-bottom: 0; }
.number-list .num { color: var(--steel); font-weight: 900; font-size: 26px; line-height: 1; }
.lab-grid { display: grid; grid-template-columns: minmax(300px,.9fr) minmax(0,1.1fr); gap: 20px; }
.lab-options { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.lab-option { border: 1px solid var(--border); background: #fff; border-radius: 14px; padding: 18px; }
.demo-toggle { display: inline-flex; align-items: center; gap: 10px; border: 0; background: transparent; color: var(--steel); font-weight: 800; padding: 8px 0; }
.demo-switch { width: 46px; height: 26px; border-radius: 13px; background: #BFCED9; position: relative; transition: .2s ease; }
.demo-switch::after { content: ""; width: 20px; height: 20px; border-radius: 50%; position: absolute; left: 3px; top: 3px; background: #fff; transition: .2s ease; }
.demo-toggle[aria-pressed="true"] .demo-switch { background: var(--mint); }
.demo-toggle[aria-pressed="true"] .demo-switch::after { transform: translateX(20px); }
.mobile-experience { display: grid; grid-template-columns: minmax(260px,.72fr) minmax(0,1.28fr); gap: 24px; align-items: center; }
.app-brand-row { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.app-brand-row h3 { margin: 0; }
.boundary-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.boundary-grid .rule-card:last-child { grid-column: 1 / -1; }

/* 内页差异化组件 */
.step-board { counter-reset: step; display: grid; gap: 14px; }
.step-item { counter-increment: step; display: grid; grid-template-columns: 74px 1fr; gap: 16px; padding: 20px; border: 1px solid var(--border); border-radius: 14px; background: #fff; }
.step-item::before { content: "0" counter(step); color: var(--steel); font-size: 30px; font-weight: 900; }
.step-item h2, .step-item h3 { margin-top: 0; }
.brief-board { display: grid; grid-template-columns: 1.2fr .8fr; gap: 16px; }
.brief-main { border: 1px solid var(--border); border-radius: 16px; padding: 24px; background: #fff; }
.brief-side { display: grid; gap: 16px; }
.archive-index { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.archive-entry { border-left: 4px solid var(--steel); border-radius: 0 14px 14px 0; padding: 20px; background: #fff; border-top: 1px solid var(--border); border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.archive-entry h2, .archive-entry h3 { margin-top: 0; }
.horizontal-stack { display: grid; gap: 16px; }
.horizontal-card { display: grid; grid-template-columns: 220px 1fr; gap: 20px; align-items: start; padding: 20px; background: #fff; border: 1px solid var(--border); border-radius: 14px; }
.horizontal-card .type-mark { min-height: 150px; border-radius: 12px; background: linear-gradient(145deg,#DCEBF5,#EAF6F4); display: grid; place-items: center; color: var(--steel); font-size: 26px; font-weight: 900; }
.compact-directory { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.directory-item { padding: 18px; border-radius: 12px; border: 1px solid var(--border); background: #fff; }
.chapter-book { display: grid; gap: 18px; }
.chapter { position: relative; padding: 24px 24px 24px 72px; border-radius: 14px; background: #fff; border: 1px solid var(--border); }
.chapter .chapter-no { position: absolute; left: 20px; top: 22px; color: var(--steel); font-size: 24px; font-weight: 900; }
.process-flow { display: grid; gap: 0; }
.process-step { position: relative; display: grid; grid-template-columns: 88px 1fr; gap: 16px; padding: 0 0 26px; }
.process-step:not(:last-child)::before { content: ""; position: absolute; left: 33px; top: 46px; bottom: 0; width: 2px; background: var(--ice); }
.process-number { width: 66px; height: 46px; border-radius: 12px; background: var(--steel); color: #fff; display: grid; place-items: center; font-weight: 900; }
.process-copy { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 18px; }
.magazine-grid { display: grid; grid-template-columns: repeat(12,1fr); gap: 12px; }
.magazine-block { padding: 20px; border-radius: 14px; border: 1px solid var(--border); background: #fff; grid-column: span 6; }
.magazine-block:nth-child(1), .magazine-block:nth-child(6) { grid-column: span 7; background: #EAF4FA; }
.magazine-block:nth-child(2), .magazine-block:nth-child(5) { grid-column: span 5; background: #E8F4F1; }
.shelf-layers { display: grid; gap: 14px; }
.shelf-layer { display: grid; grid-template-columns: 170px 1fr; gap: 18px; padding: 18px; background: #fff; border: 1px solid var(--border); border-radius: 14px; }
.shelf-layer h2, .shelf-layer h3 { margin: 0; }
.editor-ranking { counter-reset: rank; display: grid; gap: 12px; }
.editor-ranking article { counter-increment: rank; display: grid; grid-template-columns: 72px 1fr; gap: 18px; padding: 20px; border-radius: 14px; background: #fff; border: 1px solid var(--border); }
.editor-ranking article::before { content: "0" counter(rank); color: var(--steel); font-size: 30px; font-weight: 900; }
.kanban { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 10px; align-items: start; }
.kanban-col { min-height: 260px; border-radius: 14px; background: #EAF3F9; border: 1px solid var(--border); padding: 14px; }
.kanban-col h2, .kanban-col h3 { margin: 0 0 12px; font-size: 16px; }
.kanban-card { margin-top: 10px; padding: 12px; border-radius: 10px; background: #fff; color: #435D71; border: 1px solid rgba(30,111,184,.10); }
.tool-workbench { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.workbench-card { border: 1px solid var(--border); background: #fff; border-radius: 14px; padding: 20px; }
.note-article { max-width: 860px; margin: 0 auto; }
.note-article .note-section { padding: 24px 0; border-bottom: 1px solid var(--border); }
.note-article .note-section:last-child { border-bottom: 0; }
.editor-observation { margin: 22px 0; border-left: 4px solid var(--mint); background: #EAF6F4; border-radius: 0 12px 12px 0; padding: 18px 20px; color: #294E4A; }
.route-map { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 10px; position: relative; }
.route-stop { min-height: 170px; padding: 18px; border-radius: 14px; border: 1px solid var(--border); background: #fff; position: relative; }
.route-stop::after { content: "→"; position: absolute; right: -13px; top: 50%; color: var(--steel); font-weight: 900; }
.route-stop:last-child::after { display: none; }
.mobile-product { display: grid; grid-template-columns: .75fr 1.25fr; gap: 24px; align-items: start; }
.feature-list { display: grid; gap: 12px; }
.feature-row { padding: 17px; background: #fff; border: 1px solid var(--border); border-radius: 12px; }
.checklist { display: grid; gap: 10px; }
.check-item { display: grid; grid-template-columns: 42px 1fr; gap: 14px; padding: 17px; background: #fff; border: 1px solid var(--border); border-radius: 12px; }
.check-mark { width: 34px; height: 34px; border-radius: 10px; background: #E3F1F9; color: var(--steel); display: grid; place-items: center; font-weight: 900; }
.policy-groups { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.policy-card { border: 1px solid var(--border); border-radius: 14px; background: #fff; padding: 20px; }
.policy-card h2, .policy-card h3 { margin-top: 0; }
.help-index { display: grid; grid-template-columns: 240px 1fr; gap: 20px; }
.help-menu { border: 1px solid var(--border); background: #fff; border-radius: 14px; padding: 16px; align-self: start; }
.help-menu a { display: block; min-height: 42px; padding: 9px; border-bottom: 1px solid var(--border); }
.help-menu a:last-child { border-bottom: 0; }
.help-content { display: grid; gap: 14px; }
.faq-list { display: grid; gap: 10px; }
details.faq-item { border: 1px solid var(--border); border-radius: 12px; background: #fff; overflow: hidden; }
details.faq-item summary { min-height: 54px; padding: 15px 18px; color: var(--ink); font-weight: 800; cursor: pointer; }
details.faq-item p { padding: 0 18px 18px; margin: 0; color: #415B70; }
.contact-types { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.contact-card { border: 1px solid var(--border); border-radius: 14px; background: #fff; padding: 20px; }
.principles { display: grid; gap: 18px; }
.principle { display: grid; grid-template-columns: 180px 1fr; gap: 20px; padding: 22px; border-radius: 14px; border: 1px solid var(--border); background: #fff; }
.principle h2 { margin: 0; font-size: 21px; }

.site-footer { background: #164B77; color: #DCEAF4; padding: 44px 0 30px; }
.footer-inner { width: min(calc(100% - 32px),var(--max)); margin: 0 auto; }
.footer-brand { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; }
.footer-logo-link { min-height: 44px; display: inline-flex; align-items: center; color: #fff; font-size: 20px; font-weight: 800; }
.footer-logo-link img { filter: brightness(0) invert(1); max-width: 180px; }
.footer-brand p { margin: 0; display: grid; gap: 2px; }
.footer-brand strong { color: #fff; }
.footer-brand span { color: #BFD4E4; font-size: 13px; letter-spacing: .1em; }
.footer-nav-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 24px; }
.footer-nav-grid h2 { color: #fff; font-size: 16px; margin: 0 0 10px; }
.footer-nav-grid nav { display: grid; gap: 7px; }
.footer-nav-grid a { color: #C8DCEB; font-size: 14px; }
.footer-nav-grid a:hover, .footer-nav-grid a[aria-current="page"] { color: #fff; }
.footer-note { margin-top: 30px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.16); color: #BDD2E2; font-size: 13px; }
.footer-note p:last-child { margin-bottom: 0; }

.overlay {
    position: fixed; inset: 0; z-index: 80;
    background: rgba(10,31,48,.48);
    opacity: 0; visibility: hidden; pointer-events: none;
    transition: opacity .18s ease, visibility .18s ease;
}
.overlay.is-open { opacity: 1; visibility: visible; pointer-events: auto; }
.site-panel {
    position: fixed; z-index: 90; left: 50%; bottom: 20px; width: min(calc(100% - 32px),980px); max-height: 82vh;
    transform: translate(-50%,22px); opacity: 0; visibility: hidden; pointer-events: none;
    border: 1px solid var(--border); border-radius: 20px; background: #F9FCFE; box-shadow: 0 28px 80px rgba(16,38,58,.24);
    transition: .2s ease; overflow: auto;
}
.site-panel.is-open { transform: translate(-50%,0); opacity: 1; visibility: visible; pointer-events: auto; }
.panel-head { position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 18px 20px; background: rgba(249,252,254,.96); border-bottom: 1px solid var(--border); }
.panel-brand { display: flex; align-items: center; gap: 14px; }
.panel-brand span { color: var(--soft); font-size: 12px; letter-spacing: .1em; }
.panel-brand h2 { font-size: 20px; margin: 2px 0 0; }
.panel-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 14px; padding: 20px; }
.panel-grid section { min-width: 0; }
.panel-grid h3 { margin: 0 0 10px; font-size: 15px; color: var(--steel); }
.panel-grid a { display: block; min-height: 76px; border-radius: 11px; border: 1px solid var(--border); background: #fff; padding: 11px; margin-bottom: 8px; }
.panel-grid a strong, .panel-grid a span { display: block; }
.panel-grid a strong { color: var(--ink); margin-bottom: 2px; }
.panel-grid a span { color: var(--muted); font-size: 12px; line-height: 1.55; }
.panel-grid a[aria-current="page"] { border-color: var(--border-strong); background: #E9F4FB; }

.search-dialog {
    position: fixed; z-index: 91; left: 50%; top: 50%; width: min(calc(100% - 32px),640px); max-height: min(78vh,720px);
    transform: translate(-50%,-46%); opacity: 0; visibility: hidden; pointer-events: none;
    border: 1px solid var(--border); border-radius: 18px; background: #fff; box-shadow: 0 28px 80px rgba(16,38,58,.24);
    padding: 22px; overflow: auto; transition: .18s ease;
}
.search-dialog.is-open { transform: translate(-50%,-50%); opacity: 1; visibility: visible; pointer-events: auto; }
.search-head { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 18px; }
.search-head span { color: var(--soft); font-size: 12px; letter-spacing: .1em; }
.search-head h2 { margin: 2px 0 0; font-size: 22px; }
.search-label { display: block; color: var(--muted); margin-bottom: 8px; }
.search-input { width: 100%; min-height: 50px; border-radius: 11px; border: 1px solid var(--border-strong); padding: 0 14px; color: var(--ink); background: #FBFDFE; }
.search-results { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; margin-top: 14px; }
.search-results a { border: 1px solid var(--border); border-radius: 11px; padding: 13px; background: #F8FBFD; }
.search-results a strong, .search-results a span { display: block; }
.search-results a strong { color: var(--ink); }
.search-results a span { color: var(--muted); font-size: 13px; }
.search-results a[hidden] { display: none; }
.search-empty { margin: 16px 0 0; color: var(--muted); padding: 14px; background: #EFF6FA; border-radius: 10px; }

.mobile-bottom-nav { display: none; }

@media (max-width: 1100px) {
    .site-shell { grid-template-columns: 210px minmax(0,1fr); gap: 22px; }
    .task-strip { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .kanban { grid-template-columns: repeat(3,minmax(0,1fr)); }
    .panel-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 960px) {
    .site-shell { display: block; }
    .side-rail { display: none; }
    .site-main { padding-top: 24px; }
    .content-column { width: 100%; }
    .footer-nav-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 760px) {
    body { font-size: 16px; padding-bottom: calc(60px + env(safe-area-inset-bottom)); }
    .topbar-inner { width: calc(100% - 24px); min-height: 68px; gap: 8px; }
    .brand-status, .top-app-link { display: none; }
    .brand-link { max-width: 150px; }
    .brand-link img { height: 30px; max-width: 140px; }
    .brand-text { font-size: 18px; }
    .top-actions { gap: 6px; }
    .icon-button { min-width: 48px; padding: 0 11px; font-size: 14px; }
    .site-shell, .footer-inner { width: calc(100% - 32px); }
    .site-main { padding: 20px 0 54px; }
    h1 { font-size: 30px; }
    .lead { font-size: 17px; }
    .page-hero { padding: 22px 18px; border-radius: 15px; }
    .media-frame, .media-frame.compact, .media-frame.banner, .media-frame.portrait { min-height: 0; max-height: none; }
    .media-frame img, .media-frame.banner img, .media-frame.portrait img { width: 100%; height: auto; max-height: none; }
    .media-fallback { min-height: 190px; }
    .task-strip, .card-grid, .card-grid.two, .related-links, .boundary-grid, .archive-index, .compact-directory, .tool-workbench, .policy-groups, .contact-types { grid-template-columns: 1fr; }
    .editor-board, .channel-band, .people-craft, .collection-split, .lab-grid, .mobile-experience, .split-layout, .brief-board, .horizontal-card, .shelf-layer, .help-index, .principle, .mobile-product { grid-template-columns: 1fr; }
    .channel-band.reverse .media-frame, .channel-band.reverse .channel-copy, .split-layout.reverse > :first-child, .split-layout.reverse > :last-child { order: initial; }
    .topic-mosaic { grid-template-columns: 1fr; grid-auto-rows: auto; }
    .topic-tile, .topic-tile:nth-child(n) { grid-column: auto; min-height: 140px; }
    .magazine-grid { grid-template-columns: 1fr; }
    .magazine-block, .magazine-block:nth-child(n) { grid-column: auto; }
    .lab-options { grid-template-columns: 1fr; }
    .shelf-slot { grid-template-columns: 72px 1fr; }
    .route-map { grid-template-columns: 1fr; }
    .route-stop::after { content: "↓"; right: 18px; top: auto; bottom: -18px; z-index: 2; }
    .kanban { grid-template-columns: 1fr; }
    .step-item, .editor-ranking article { grid-template-columns: 56px 1fr; }
    .chapter { padding-left: 58px; }
    .process-step { grid-template-columns: 62px 1fr; }
    .process-number { width: 52px; }
    .process-step:not(:last-child)::before { left: 25px; }
    .footer-nav-grid { grid-template-columns: 1fr 1fr; gap: 22px 16px; }
    .site-footer { padding-bottom: 92px; }
    .site-panel { bottom: 0; width: 100%; max-height: 82vh; border-radius: 18px 18px 0 0; transform: translate(-50%,32px); }
    .site-panel.is-open { transform: translate(-50%,0); }
    .panel-grid { grid-template-columns: 1fr; padding: 16px; }
    .search-dialog { width: calc(100% - 32px); padding: 18px; }
    .search-results { grid-template-columns: 1fr; }
    .mobile-bottom-nav {
        position: fixed; z-index: 40; left: 0; right: 0; bottom: 0;
        min-height: calc(56px + env(safe-area-inset-bottom));
        padding: 5px 8px env(safe-area-inset-bottom);
        display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 4px;
        background: rgba(248,251,253,.96); border-top: 1px solid var(--border); box-shadow: 0 -10px 30px rgba(16,38,58,.08);
        backdrop-filter: blur(10px);
    }
    .mobile-bottom-nav a { min-width: 0; min-height: 46px; display: grid; place-items: center; border-radius: 9px; color: var(--muted); font-size: 13px; font-weight: 800; white-space: nowrap; }
    .mobile-bottom-nav a.is-current { color: #fff; background: var(--steel); }
}

@media (max-width: 420px) {
    .site-shell, .footer-inner { width: calc(100% - 32px); }
    .topbar-inner { width: calc(100% - 20px); }
    .brand-link { max-width: 126px; }
    .brand-link img { max-width: 120px; }
    .icon-button { min-width: 46px; padding: 0 9px; }
    .footer-nav-grid { grid-template-columns: 1fr; }
    .panel-brand img { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition: none !important; animation: none !important; }
}
.kanban-note { margin-top: 16px; }