/* OpenIP Hub — 视觉风格参考 Atlassian：明亮留白、粗体大标题、品牌蓝 CTA、彩色产品色块、圆角卡片 */
:root {
  --blue: #1868db; --blue-hover: #1558bc; --blue-press: #144794; --blue-subtle: #e9f2fe; --blue-text: #1558bc;
  --teal: #2898bd; --teal-subtle: #e7f9ff;
  --purple: #964ac0; --purple-subtle: #f8eefe;
  --orange: #e06c00; --orange-subtle: #fff3e0;
  --yellow: #d39f00; --yellow-subtle: #fef7c8;
  --green: #22a06b; --green-subtle: #dcfff1;
  --magenta: #cd519d; --magenta-subtle: #ffecf8;
  --lime: #6a9a23; --lime-subtle: #efffd6;
  --navy: #44546f; --navy-subtle: #f1f2f4;
  --red: #c9372c; --red-subtle: #ffeceb;

  --text: #292a2e; --text-subtle: #505258; --text-subtlest: #6b6e76;
  --bg: #ffffff; --bg-sunken: #f8f8f8; --bg-neutral: #f0f1f2; --bg-dark: #101214;
  --border: #dddee1; --border-strong: #b7b9be;
  --radius: 12px; --radius-lg: 20px; --radius-pill: 999px;
  --shadow: 0 1px 1px rgba(30,31,33,.25), 0 0 1px rgba(30,31,33,.31);
  --shadow-raised: 0 8px 12px rgba(30,31,33,.15), 0 0 1px rgba(30,31,33,.31);
  --maxw: 1200px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--blue-text); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; letter-spacing: -0.01em; color: var(--text); }
p { margin: 0; }
code, pre { font-family: var(--mono); }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- 顶部导航 ---------- */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); backdrop-filter: saturate(180%) blur(8px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 18px; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 32px; height: 32px; border-radius: 8px; background: var(--blue); display: grid; place-items: center; color: #fff; }
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--text-subtlest); letter-spacing: .02em; line-height: 1; margin-top: 2px; }
.nav-links { display: flex; gap: 4px; flex: 1; }
.nav-links a { color: var(--text-subtle); font-weight: 500; font-size: 15px; padding: 8px 12px; border-radius: 6px; }
.nav-links a:hover { background: var(--bg-neutral); color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--blue-text); }
.nav-actions { display: flex; gap: 8px; align-items: center; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; border-radius: 6px; color: var(--text); }

/* ---------- 按钮 ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: var(--radius-pill); padding: 10px 20px; font-weight: 600; font-size: 15px; border: 1.5px solid transparent; transition: background .15s, border-color .15s, transform .1s; white-space: nowrap; }
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-hover); }
.btn-secondary { background: #fff; color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover { background: var(--bg-neutral); }
.btn-ghost { background: transparent; color: var(--blue-text); padding-left: 0; padding-right: 0; }
.btn-ghost:hover { text-decoration: underline; }
.btn-sm { padding: 6px 14px; font-size: 14px; }
.btn-light { background: #fff; color: var(--blue-press); }
.btn-light:hover { background: var(--blue-subtle); }

/* ---------- 通用排版 ---------- */
.section { padding: 88px 0; }
.section-sunken { background: var(--bg-sunken); }
.eyebrow { font-size: 14px; font-weight: 600; color: var(--blue-text); letter-spacing: .04em; text-transform: uppercase; margin-bottom: 12px; }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.h-display { font-size: clamp(40px, 6vw, 68px); font-weight: 800; letter-spacing: -0.025em; line-height: 1.06; }
.h1 { font-size: clamp(32px, 4.4vw, 48px); font-weight: 800; letter-spacing: -0.02em; }
.h2 { font-size: clamp(26px, 3.2vw, 36px); font-weight: 700; }
.h3 { font-size: 20px; font-weight: 700; }
.lead { font-size: 20px; color: var(--text-subtle); line-height: 1.55; margin-top: 16px; }
.muted { color: var(--text-subtle); }
.small { font-size: 14px; }
.grid { display: grid; gap: 24px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.stack-8 > * + * { margin-top: 8px; }
.stack-16 > * + * { margin-top: 16px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }

/* ---------- Hero ---------- */
.hero { padding: 80px 0 72px; overflow: hidden; background: linear-gradient(180deg, #fff 0%, #f5f8ff 100%); }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero .lead { max-width: 560px; }
.hero-cta { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.hero-note { margin-top: 20px; font-size: 14px; color: var(--text-subtlest); display: flex; gap: 16px; flex-wrap: wrap; }
.hero-note span { display: inline-flex; gap: 6px; align-items: center; }
.hero-visual { position: relative; min-height: 440px; }
.hv-card { position: absolute; background: #fff; border-radius: 16px; box-shadow: var(--shadow-raised); padding: 18px; }
.hv-main { left: 6%; right: 4%; top: 30px; }
.hv-tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 14px; }
.hv-tile { border-radius: 10px; padding: 12px; font-size: 13px; font-weight: 600; display: flex; flex-direction: column; gap: 8px; }
.hv-tile .ico { width: 28px; height: 28px; border-radius: 7px; display: grid; place-items: center; color: #fff; }
.hv-float1 { right: -2%; top: 290px; width: 250px; }
.hv-float2 { left: -2%; top: 320px; width: 230px; }
.hv-shape { position: absolute; border-radius: 28px; z-index: -1; }
.search-mock { display: flex; align-items: center; gap: 10px; border: 1.5px solid var(--border); border-radius: var(--radius-pill); padding: 10px 16px; color: var(--text-subtlest); font-size: 14px; }

/* ---------- 统计条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--border); border-radius: var(--radius-lg); background: #fff; }
.stat { padding: 28px; border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat b { display: block; font-size: 40px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.stat span { color: var(--text-subtle); font-size: 15px; }

/* ---------- 色块 / 图标 ---------- */
.ico-box { width: 44px; height: 44px; border-radius: 10px; display: grid; place-items: center; color: #fff; flex: none; }
.ico-box.lg { width: 56px; height: 56px; border-radius: 14px; }
.bg-blue { background: var(--blue); } .bg-teal { background: var(--teal); } .bg-purple { background: var(--purple); } .bg-orange { background: var(--orange); }
.bg-yellow { background: var(--yellow); } .bg-green { background: var(--green); } .bg-magenta { background: var(--magenta); } .bg-lime { background: var(--lime); } .bg-navy { background: var(--navy); }
.tint-blue { background: var(--blue-subtle); } .tint-teal { background: var(--teal-subtle); } .tint-purple { background: var(--purple-subtle); } .tint-orange { background: var(--orange-subtle); }
.tint-yellow { background: var(--yellow-subtle); } .tint-green { background: var(--green-subtle); } .tint-magenta { background: var(--magenta-subtle); } .tint-lime { background: var(--lime-subtle); } .tint-navy { background: var(--navy-subtle); }

/* ---------- 卡片 ---------- */
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: box-shadow .2s, border-color .2s, transform .2s; color: var(--text); display: block; }
.card.row { display: flex; }
a.card:hover, .card.hoverable:hover { box-shadow: var(--shadow-raised); border-color: transparent; text-decoration: none; transform: translateY(-2px); }
.scenario-card { display: flex; flex-direction: column; gap: 14px; min-height: 210px; }
.scenario-card .count { margin-top: auto; font-size: 14px; color: var(--text-subtle); display: flex; justify-content: space-between; align-items: center; }
.scenario-card .count .arrow { color: var(--blue-text); font-weight: 600; display: inline-flex; gap: 4px; align-items: center; }

.proj-card { display: flex; flex-direction: column; gap: 12px; height: 100%; }
.proj-top { display: flex; gap: 12px; align-items: flex-start; }
.proj-avatar { width: 40px; height: 40px; border-radius: 10px; background: var(--bg-neutral); flex: none; object-fit: cover; }
.proj-name { font-weight: 700; font-size: 16px; line-height: 1.3; word-break: break-word; }
.proj-owner { font-size: 13px; color: var(--text-subtlest); }
.proj-desc { font-size: 14.5px; color: var(--text-subtle); line-height: 1.55; flex: 1; }
.proj-meta { display: flex; gap: 14px; font-size: 13px; color: var(--text-subtlest); align-items: center; flex-wrap: wrap; border-top: 1px solid var(--border); padding-top: 12px; }
.proj-meta span { display: inline-flex; gap: 4px; align-items: center; }

/* ---------- 徽标 ---------- */
.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 4px; line-height: 18px; white-space: nowrap; }
.b-neutral { background: var(--bg-neutral); color: var(--text-subtle); }
.b-blue { background: var(--blue-subtle); color: var(--blue-press); }
.b-green { background: var(--green-subtle); color: #216e4e; }
.b-orange { background: var(--orange-subtle); color: #9e4c00; }
.b-purple { background: var(--purple-subtle); color: #803fa5; }
.b-red { background: var(--red-subtle); color: #ae2e24; }
.b-yellow { background: var(--yellow-subtle); color: #7f5f01; }
.b-teal { background: var(--teal-subtle); color: #206a83; }
.lozenge { text-transform: uppercase; letter-spacing: .03em; font-size: 11px; }

/* ---------- 学习路径阶梯 ---------- */
.ladder { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; align-items: end; }
.rung { border-radius: var(--radius-lg); padding: 24px; color: #fff; display: flex; flex-direction: column; gap: 10px; transition: transform .2s, box-shadow .2s; }
.rung:hover { transform: translateY(-4px); box-shadow: var(--shadow-raised); text-decoration: none; }
.rung .lv { font-size: 13px; font-weight: 700; opacity: .85; letter-spacing: .05em; }
.rung h3 { color: #fff; font-size: 22px; }
.rung p { font-size: 14.5px; opacity: .92; }
.rung .go { margin-top: auto; font-weight: 600; font-size: 14px; display: inline-flex; gap: 6px; align-items: center; }
.rung.r0 { min-height: 240px; background: var(--green); }
.rung.r1 { min-height: 280px; background: var(--blue); }
.rung.r2 { min-height: 320px; background: var(--orange); }
.rung.r3 { min-height: 360px; background: var(--purple); }

/* ---------- 横幅 ---------- */
.band { border-radius: 24px; padding: 56px; display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; align-items: center; }
.band-blue { background: var(--blue); color: #fff; }
.band-blue h2, .band-blue h3 { color: #fff; }
.band-blue .lead { color: rgba(255,255,255,.88); }
.band-dark { background: #1f1f21; color: #fff; }
.band-dark h2 { color: #fff; }
.band-dark .lead { color: rgba(255,255,255,.8); }
.band-yellow { background: var(--yellow-subtle); }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.check-list li { display: flex; gap: 10px; align-items: flex-start; }
.check-list li svg { flex: none; margin-top: 3px; }

/* ---------- 页面头部 ---------- */
.page-head { padding: 64px 0 40px; border-bottom: 1px solid var(--border); background: linear-gradient(180deg, #f5f8ff, #fff); }
.page-head.tinted { border-bottom: 0; }
.crumbs { font-size: 14px; color: var(--text-subtlest); margin-bottom: 16px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.crumbs a { color: var(--text-subtle); }

/* ---------- 项目库 ---------- */
.lib { display: grid; grid-template-columns: 260px 1fr; gap: 40px; padding: 40px 0 88px; }
.filters { position: sticky; top: 88px; align-self: start; display: grid; gap: 24px; max-height: calc(100vh - 110px); overflow: auto; padding-right: 4px; }
.filter h4 { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-subtlest); margin-bottom: 10px; font-weight: 700; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--border); background: #fff; border-radius: var(--radius-pill); padding: 4px 12px; font-size: 13.5px; color: var(--text-subtle); font-weight: 500; }
.chip:hover { border-color: var(--border-strong); color: var(--text); }
.chip.on { background: var(--blue-subtle); border-color: var(--blue); color: var(--blue-press); }
.toggle { display: flex; gap: 10px; align-items: center; font-size: 14px; color: var(--text-subtle); cursor: pointer; padding: 4px 0; }
.toggle input { width: 16px; height: 16px; accent-color: var(--blue); }
.searchbar { display: flex; align-items: center; gap: 10px; border: 2px solid var(--border); border-radius: var(--radius-pill); padding: 0 18px; background: #fff; transition: border-color .15s; }
.searchbar:focus-within { border-color: var(--blue); }
.searchbar input { border: 0; outline: 0; font: inherit; font-size: 16px; padding: 12px 0; flex: 1; min-width: 0; background: transparent; color: var(--text); }
.toolbar { display: flex; gap: 16px; align-items: center; margin: 20px 0; flex-wrap: wrap; }
.toolbar select { font: inherit; font-size: 14px; border: 1px solid var(--border-strong); border-radius: 8px; padding: 6px 10px; background: #fff; color: var(--text); }
.empty { text-align: center; padding: 64px 24px; color: var(--text-subtle); border: 1px dashed var(--border-strong); border-radius: var(--radius); }

/* ---------- 详情页 ---------- */
.detail { display: grid; grid-template-columns: 1fr 340px; gap: 48px; padding: 48px 0 88px; }
.detail > *, .detail > aside > *, .lib > *, .grid > *, .step > *, .panel { min-width: 0; }
.panel { border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; background: #fff; }
.panel h3 { font-size: 16px; margin-bottom: 16px; }
.kv { display: grid; grid-template-columns: 96px 1fr; gap: 10px 12px; font-size: 14px; }
.kv dt { color: var(--text-subtlest); }
.kv dd { margin: 0; font-weight: 500; }
.callout { border-radius: var(--radius); padding: 16px 20px; display: flex; gap: 12px; font-size: 14.5px; }
.callout svg { flex: none; margin-top: 2px; }
.callout-green { background: var(--green-subtle); } .callout-orange { background: var(--orange-subtle); } .callout-blue { background: var(--blue-subtle); } .callout-neutral { background: var(--bg-neutral); } .callout-yellow { background: var(--yellow-subtle); }
.codeblock { position: relative; background: #1f1f21; color: #e6e6e6; border-radius: 10px; padding: 14px 16px; font-size: 13.5px; overflow-x: auto; margin-top: 10px; }
.codeblock pre { margin: 0; white-space: pre; }
.copy-btn { position: absolute; right: 8px; top: 8px; background: rgba(255,255,255,.12); color: #fff; border: 0; border-radius: 6px; font-size: 12px; padding: 4px 8px; }
.copy-btn:hover { background: rgba(255,255,255,.22); }

/* ---------- 步骤 ---------- */
.steps { counter-reset: s; display: grid; gap: 16px; }
.step { display: grid; grid-template-columns: 44px 1fr; gap: 16px; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; background: #fff; }
.step-n { width: 36px; height: 36px; border-radius: 50%; background: var(--blue-subtle); color: var(--blue-press); font-weight: 700; display: grid; place-items: center; }
.step.done .step-n { background: var(--green); color: #fff; }
.step h4 { font-size: 17px; margin-bottom: 6px; }
.step .muted { font-size: 15px; }
.step .row { margin-top: 10px; }
.step.human .step-n { background: var(--yellow-subtle); color: #7f5f01; }

/* ---------- 配方 ---------- */
.flow { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 0; margin-top: 20px; }
.flow-step { position: relative; padding: 16px 20px 16px 0; }
.flow-step::before { content: ""; position: absolute; left: 14px; right: 0; top: 30px; height: 2px; background: var(--border); }
.flow-step:last-child::before { display: none; }
.flow-dot { position: relative; z-index: 1; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 13px; margin-bottom: 12px; }
.flow-step h4 { font-size: 15px; margin-bottom: 4px; }
.flow-step p { font-size: 13.5px; color: var(--text-subtle); }
.flow-step .proj-link { font-size: 13px; margin-top: 6px; display: inline-flex; gap: 4px; align-items: center; font-weight: 600; }

/* ---------- 表格 ---------- */
.table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.table th, .table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-subtlest); font-weight: 700; background: var(--bg-sunken); }

/* ---------- 页脚 ---------- */
.footer { background: var(--bg-sunken); border-top: 1px solid var(--border); padding: 56px 0 32px; font-size: 14px; color: var(--text-subtle); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.footer h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--text); margin-bottom: 14px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer a { color: var(--text-subtle); }
.footer-org { margin-top: 18px; font-size: 13.5px; line-height: 1.7; }
.footer-org b { color: var(--text); font-weight: 600; }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 40px; padding-top: 20px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--text-subtlest); }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px); background: #1f1f21; color: #fff; padding: 10px 18px; border-radius: 8px; font-size: 14px; opacity: 0; transition: .2s; pointer-events: none; z-index: 100; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 社区 ---------- */
.promise { display: flex; gap: 14px; align-items: flex-start; padding: 20px; border-radius: var(--radius); background: var(--blue-subtle); color: var(--blue-press); }
.promise svg { flex: none; margin-top: 2px; }
.promise b { color: var(--text); display: block; margin-bottom: 4px; }
.faq { border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; background: #fff; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--text-subtlest); font-weight: 400; font-size: 20px; line-height: 1; }
.faq[open] summary::after { content: "−"; }
.faq p { margin-top: 10px; font-size: 15px; }

/* ---------- 移动端菜单与筛选开关 ---------- */
.nav-mobile-only { display: none; }
.filter-toggle { display: none; }
.filter-bar { display: none; }
body { -webkit-tap-highlight-color: transparent; }

/* ---------- 响应式 ---------- */
/* 大屏：适当放宽内容区 */
@media (min-width: 1600px) {
  :root { --maxw: 1320px; }
  .hero { padding: 104px 0 96px; }
}
/* 小桌面 / 横屏平板 */
@media (max-width: 1180px) {
  .nav-inner { gap: 16px; }
  .nav-links a { padding: 8px 10px; font-size: 14.5px; }
  .lib { grid-template-columns: 220px 1fr; gap: 28px; }
  .detail { grid-template-columns: 1fr 300px; gap: 32px; }
}
@media (max-width: 1080px) {
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { min-height: 400px; width: 100%; max-width: 600px; margin: 0 auto; }
  .ladder { grid-template-columns: repeat(2, 1fr); }
  .rung { min-height: 220px !important; }
  .detail { grid-template-columns: 1fr; }
  .detail > aside { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; align-items: start; }
  .detail > aside > * + * { margin-top: 0; }
  .band { padding: 44px; gap: 32px; }
}
/* 竖屏平板及以下：折叠导航 */
@media (max-width: 960px) {
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; flex-direction: column; gap: 0; padding: 8px 16px 16px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-raised); max-height: calc(100vh - 64px); overflow-y: auto; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 8px; font-size: 16px; border-bottom: 1px solid var(--bg-neutral); border-radius: 0; }
  .nav-links .nav-mobile-only { display: block; }
  .nav-actions { margin-left: auto; }
  .nav-toggle { display: inline-flex; }
  .nav-actions .btn-secondary { display: none; }
}
@media (max-width: 860px) {
  .g3 { grid-template-columns: repeat(2, 1fr); }
  .g2 { grid-template-columns: 1fr; }
  .grid { gap: 16px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
  .lib { grid-template-columns: 1fr; gap: 0; padding-top: 24px; }
  .lib .grid.g2 { grid-template-columns: repeat(2, 1fr); }
  .filter-bar { display: flex; margin-bottom: 12px; }
  .filter-toggle { display: inline-flex; }
  .filters { position: static; max-height: none; display: none; padding: 20px; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 8px; }
  .filters.open { display: grid; }
  .band { grid-template-columns: 1fr; padding: 36px 28px; }
  .flow { grid-auto-flow: row; }
  .flow-step { padding: 0 0 20px 44px; }
  .flow-step::before { left: 14px; right: auto; top: 30px; bottom: 0; width: 2px; height: auto; }
  .flow-dot { position: absolute; left: 0; top: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .section { padding: 64px 0; }
  .page-head { padding: 44px 0 32px; }
  .section-head { margin-bottom: 32px; }
}
/* 手机 */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .g3, .g4, .ladder, .lib .grid.g2 { grid-template-columns: 1fr; }
  .detail > aside { grid-template-columns: 1fr; }
  .detail { padding: 32px 0 64px; }
  .lead { font-size: 17px; }
  .hero { padding: 40px 0 56px; }
  .hero-visual { display: none; }
  .hero-cta .btn { flex: 1 1 auto; }
  .hero-note { gap: 8px 16px; }
  .section { padding: 52px 0; }
  .stat { padding: 18px 16px; }
  .stat b { font-size: 30px; }
  .stat span { font-size: 13.5px; }
  .card { padding: 20px; }
  .scenario-card { min-height: 0; display: grid; grid-template-columns: 44px 1fr; column-gap: 14px; row-gap: 6px; padding: 18px; }
  .scenario-card .ico-box { grid-row: 1 / 3; }
  .scenario-card .count { grid-column: 2; margin-top: 4px; }
  .scenario-card h3 { font-size: 18px; }
  .rung { min-height: 0 !important; padding: 20px; }
  .band { border-radius: 18px; padding: 28px 20px; }
  .step { grid-template-columns: 1fr; gap: 10px; padding: 16px; }
  .step .row .spacer { display: none; }
  .table { display: block; overflow-x: auto; white-space: nowrap; }
  .table td.muted { white-space: normal; min-width: 200px; }
  .kv { grid-template-columns: 84px 1fr; }
  .crumbs { font-size: 13px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; }
  .nav-actions .btn-primary { padding: 6px 12px; font-size: 13.5px; }
  .brand small { display: none; }
}
@media (max-width: 360px) {
  .nav-actions .btn-primary { display: none; }
  .stats { grid-template-columns: 1fr; }
  .stat { border-right: 0 !important; border-bottom: 1px solid var(--border); }
  .stat:last-child { border-bottom: 0; }
}
@media (hover: none) {
  a.card:hover, .card.hoverable:hover, .rung:hover { transform: none; }
}

/* ================= 社区（参考掘金的信息流布局） ================= */
.feed-wrap { display: grid; grid-template-columns: 188px minmax(0, 1fr) 300px; gap: 24px; padding: 24px 24px 88px; align-items: start; }
.feed-cats { position: sticky; top: 88px; display: flex; flex-direction: column; gap: 2px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 8px; }
.feed-cats a { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 8px; color: var(--text-subtle); font-size: 15px; font-weight: 500; white-space: nowrap; }
.feed-cats a:hover { background: var(--bg-neutral); color: var(--text); text-decoration: none; }
.feed-cats a.on { background: var(--blue-subtle); color: var(--blue-press); font-weight: 600; }
.feed-main { min-width: 0; }
.feed-side { position: sticky; top: 88px; display: grid; gap: 16px; }
.feed-side .panel { padding: 20px; }
.feed-side .panel h3 { font-size: 15px; margin-bottom: 12px; }
.feed-tag-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.moment-box { display: flex; gap: 12px; align-items: center; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 16px; }
.moment-input { flex: 1; min-width: 0; background: var(--bg-sunken); border-radius: var(--radius-pill); padding: 10px 18px; color: var(--text-subtlest); font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.moment-input:hover { text-decoration: none; background: var(--bg-neutral); }
.feed-tabs { display: flex; align-items: center; gap: 12px; padding: 4px 0 12px; flex-wrap: wrap; }
.seg { display: inline-flex; gap: 4px; background: var(--bg-neutral); padding: 4px; border-radius: var(--radius-pill); }
.seg a { padding: 6px 16px; border-radius: var(--radius-pill); color: var(--text-subtle); font-weight: 600; font-size: 14.5px; white-space: nowrap; }
.seg a:hover { text-decoration: none; color: var(--text); }
.seg a.on { background: #fff; color: var(--blue-press); box-shadow: var(--shadow); }
.seg-sm a { padding: 4px 12px; font-size: 13.5px; }
.feed-list { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.feed-list > .empty { border: 0; }
.post-card { padding: 18px 22px; border-bottom: 1px solid var(--border); transition: background .15s; }
.post-card:last-child { border-bottom: 0; }
.post-card:hover { background: #fafbfc; }
.post-meta { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--text-subtlest); flex-wrap: wrap; }
.post-meta a { color: var(--text-subtlest); }
.dot { width: 3px; height: 3px; border-radius: 50%; background: var(--border-strong); }
.post-link { display: block; color: var(--text); margin: 8px 0 10px; }
.post-link:hover { text-decoration: none; }
.post-link:hover h3 { color: var(--blue-text); }
.post-link h3 { font-size: 18px; font-weight: 700; line-height: 1.45; }
.post-link p { color: var(--text-subtle); font-size: 14.5px; margin-top: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-foot { display: flex; align-items: center; gap: 16px; font-size: 13.5px; color: var(--text-subtlest); }
.post-foot .act { display: inline-flex; align-items: center; gap: 4px; }
.post-foot .act.on { color: var(--red); }
.tag { display: inline-block; font-size: 12.5px; padding: 2px 10px; border-radius: var(--radius-pill); background: var(--bg-neutral); color: var(--text-subtle); font-weight: 500; }
.tag:hover { background: var(--blue-subtle); color: var(--blue-press); text-decoration: none; }
.u-avatar { display: inline-grid; place-items: center; border-radius: 50%; color: #fff; font-weight: 700; flex: none; background: var(--navy); line-height: 1; }
.u-avatar.ed { background: var(--blue); border-radius: 28%; }
.side-free { display: flex; gap: 12px; align-items: flex-start; background: var(--blue-subtle); border-color: transparent; color: var(--blue-press); }
.side-free b { color: var(--text); }
.side-free svg { flex: none; margin-top: 2px; }
.local-note { display: flex; gap: 6px; align-items: center; padding: 0 4px; }
.home-post { display: flex; flex-direction: column; }

/* 文章页 */
.post-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; padding: 32px 24px 88px; align-items: start; }
.post-body { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 40px; min-width: 0; }
.post-title { font-size: clamp(24px, 3vw, 32px); font-weight: 800; line-height: 1.3; }
.post-side { position: sticky; top: 88px; display: grid; gap: 16px; }
.post-side .panel { padding: 20px; }
.post-side .panel h3 { font-size: 15px; margin-bottom: 12px; }
.rel-link { display: grid; gap: 2px; color: var(--text); font-size: 14.5px; line-height: 1.45; }
.rel-link:hover b { color: var(--blue-text); }
.rel-link:hover { text-decoration: none; }
.md { font-size: 16.5px; line-height: 1.85; color: var(--text); }
.md > * + * { margin-top: 14px; }
.md h2 { font-size: 21px; margin-top: 32px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.md ul, .md ol { padding-left: 1.4em; margin-bottom: 0; }
.md li + li { margin-top: 6px; }
.md code { background: var(--bg-neutral); padding: 1px 6px; border-radius: 4px; font-size: .88em; color: #ae2e24; }
.md .codeblock code { background: none; padding: 0; color: inherit; }
.post-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border); }
.post-actions .btn.is-on { color: var(--red); border-color: var(--red); background: var(--red-subtle); }

.submit-banner { display: flex; align-items: center; gap: 14px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 16px; color: var(--text); }
.submit-banner:hover { text-decoration: none; border-color: var(--blue); }
.submit-banner > span:nth-child(2) { flex: 1; display: grid; }
.side-stats { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); text-align: center; }
.side-stats b { display: block; font-size: 20px; }
.side-stats span { font-size: 12.5px; color: var(--text-subtlest); }
.discuss-box { display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; margin-top: 32px; padding: 20px; background: var(--bg-sunken); border-radius: var(--radius); }
.num-dot { flex: none; width: 24px; height: 24px; border-radius: 50%; background: rgba(255,255,255,.2); display: grid; place-items: center; font-size: 13px; font-weight: 700; }

/* 社区响应式 */
@media (max-width: 1180px) {
  .feed-wrap { grid-template-columns: minmax(0, 1fr) 280px; }
  .feed-cats { grid-column: 1 / -1; position: static; flex-direction: row; overflow-x: auto; scrollbar-width: none; padding: 6px; }
  .feed-cats::-webkit-scrollbar { display: none; }
  .feed-cats a { padding: 7px 12px; font-size: 14px; }
  .post-wrap { grid-template-columns: minmax(0, 1fr) 280px; }
}
@media (max-width: 860px) {
  .feed-wrap { grid-template-columns: minmax(0, 1fr); padding: 16px 16px 64px; gap: 16px; }
  .feed-cats { position: sticky; top: 64px; z-index: 10; border-radius: 0; margin: -16px -16px 0; border-width: 0 0 1px; }
  .feed-side { position: static; grid-template-columns: repeat(2, 1fr); }
  .post-wrap { grid-template-columns: minmax(0, 1fr); padding: 16px 16px 64px; }
  .post-side { position: static; }
  .post-body { padding: 24px 20px; }
}
@media (max-width: 600px) {
  .feed-side { grid-template-columns: 1fr; }
  .feed-cats a svg { display: none; }
  .post-card { padding: 16px; }
  .post-link h3 { font-size: 16.5px; }
  .feed-tabs .spacer { display: none; }
  .post-body { padding: 20px 16px; border-radius: 0; border-width: 1px 0; margin: 0 -16px; }
  .md { font-size: 16px; }
  .submit-banner .btn { display: none; }
}