*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { --bg: #f8f8f6; --surface: #ffffff; --border: #e4e4e0; --border-subtle: #ededea; --text-primary: #19191a; --text-secondary: #60605a; --text-muted: #9a9a94; --accent: #1c5fdd; --accent-light: #edf2ff; --accent-hover: #1a54c7; --pink: #e8433d; --green: #788c5d; --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; --mono: 'JetBrains Mono', ui-monospace, monospace; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--sans); background: var(--bg); color: var(--text-primary); line-height: 1.6; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
.container { max-width: 760px; margin: 0 auto; padding: 0 28px; }
.container.wide { max-width: 920px; }
.hr { height: 1px; background: var(--border); }
/* ── Nav ── */
nav { position: sticky; top: 0; z-index: 200; background: rgba(248, 248, 246, 0.88); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 760px; margin: 0 auto; padding: 0 28px; height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.nav-brand { font-family: var(--mono); font-size: 16px; font-weight: 500; color: var(--text-primary); text-decoration: none; letter-spacing: -0.01em; white-space: nowrap; }
.nav-brand em { color: var(--accent); font-style: normal; }
.nav-links { list-style: none; display: flex; gap: 22px; flex-wrap: wrap; }
.nav-links a { font-size: 12.5px; font-weight: 500; color: var(--text-secondary); text-decoration: none; transition: color 0.15s; white-space: nowrap; }
.nav-links a:hover { color: var(--text-primary); }
/* ── Hero ── */
.hero { padding: 72px 0 52px; }
.hero.hero-home { padding: 88px 0 68px; }
.back-link { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--text-muted); text-decoration: none; margin-bottom: 26px; transition: color 0.15s; }
.back-link:hover { color: var(--accent); }
.hero-label { font-family: var(--mono); font-size: 11.5px; font-weight: 500; color: var(--accent); text-transform: uppercase; letter-spacing: 0.1em; display: flex; align-items: center; gap: 10px; margin-bottom: 22px; }
.hero-label::before { content: ''; display: block; width: 22px; height: 1.5px; background: var(--accent); border-radius: 2px; }
.hero h1 { font-size: clamp(32px, 6vw, 46px); font-weight: 600; letter-spacing: -0.03em; line-height: 1.12; color: #4a4a4a; margin-bottom: 12px; }
.hero.hero-home h1 { font-size: clamp(38px, 7vw, 56px); font-weight: 600; letter-spacing: -0.035em; line-height: 1.08; color: #4a4a4a; margin-bottom: 10px; }
.hero-subtitle { font-family: var(--mono); font-size: 14px; font-weight: 400; color: var(--text-muted); letter-spacing: 0.04em; margin-bottom: 26px; }
.hero-subtitle span { color: var(--text-secondary); }
.hero-desc { font-size: 16.5px; font-weight: 400; color: var(--text-secondary); line-height: 1.75; }
.hero.hero-home .hero-desc { font-size: 17px; font-weight: 400; color: var(--text-secondary); max-width: 560px; line-height: 1.75; margin-bottom: 36px; }
.hero-desc strong { color: var(--text-primary); font-weight: 500; }
.hero-desc a { color: var(--accent); text-decoration: none; }
.hero-desc a:hover { text-decoration: underline; }
/* ── Sections ── */
section { padding: 60px 0; }
.sec-eyebrow { font-family: var(--mono); font-size: 14px; font-weight: 500; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 20px; }
.sec-title { font-size: 27px; font-weight: 600; letter-spacing: -0.02em; color: #4a4a4a; margin-bottom: 14px; }
.sec-body { font-size: 15.5px; color: var(--text-secondary); line-height: 1.78; }
.sec-body p + p { margin-top: 14px; }
.sec-body a { color: var(--accent); text-decoration: none; }
.sec-body a:hover { text-decoration: underline; }
.subsection { margin-top: 40px; }
.subsection:first-child { margin-top: 0; }
.subsection-title { font-size: 17px; font-weight: 600; color: var(--text-primary); letter-spacing: -0.01em; margin-bottom: 10px; }
/* ── Tags ── */
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.tag { font-family: var(--mono); font-size: 10.5px; font-weight: 500; padding: 3px 8px; border-radius: 4px; background: var(--accent-light); color: var(--accent); letter-spacing: 0.01em; }
/* ── Footer ── */
footer { padding: 30px 0; border-top: 1px solid var(--border); }
.footer-inner { max-width: 760px; margin: 0 auto; padding: 0 28px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.footer-text { font-family: var(--mono); font-size: 11.5px; color: var(--text-muted); display: flex; align-items: center; gap: 6px; }
/* ── Animations ── */
.fade { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade.in { opacity: 1; transform: translateY(0); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: 8px; font-size: 13.5px; font-weight: 500; text-decoration: none; transition: all 0.15s ease; line-height: 1; }
.btn-dark { background: var(--text-primary); color: #fff; }
.btn-dark:hover { background: #2c2c2c; transform: translateY(-1px); box-shadow: 0 5px 16px rgba(0,0,0,0.18); }
.btn-outline { background: var(--surface); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-outline:hover { color: var(--text-primary); border-color: #c8c8c2; background: #f2f2ef; transform: translateY(-1px); }
.btn svg { width: 14px; height: 14px; flex-shrink: 0; }
/* ── Focus cards ── */
.focus-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 24px; }
.focus-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px 20px 18px; transition: box-shadow 0.18s, border-color 0.18s; }
.focus-card:hover { border-color: #c8c8c2; box-shadow: 0 4px 18px rgba(0,0,0,0.07); }
.focus-icon { font-size: 19px; margin-bottom: 10px; display: block; }
.focus-card h3 { font-size: 13.5px; font-weight: 600; letter-spacing: -0.01em; color: var(--text-primary); margin-bottom: 6px; }
.focus-card p { font-size: 12.5px; color: var(--text-secondary); line-height: 1.62; }
/* ── Research list ── */
.research-list { display: flex; flex-direction: column; gap: 0; margin-top: 8px; }
.research-item { display: flex; align-items: flex-start; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--border-subtle); }
.research-item:first-child { border-top: 1px solid var(--border-subtle); }
.research-num { font-family: var(--mono); font-size: 11px; color: var(--text-muted); padding-top: 3px; min-width: 20px; font-weight: 500; }
.research-name { flex: 1; min-width: 0; font-size: 14.5px; font-weight: 500; color: var(--text-primary); line-height: 1.5; }
.research-name em { display: block; font-style: normal; font-size: 13px; font-weight: 400; color: var(--text-secondary); margin-top: 3px; }
/* ── Tech table ── */
.tech-grid { display: flex; flex-direction: column; gap: 0; margin-top: 8px; }
.tech-row { display: flex; gap: 20px; padding: 15px 0; border-bottom: 1px solid var(--border-subtle); }
.tech-row:first-child { border-top: 1px solid var(--border-subtle); }
.tech-category { font-size: 13px; font-weight: 500; color: var(--text-primary); min-width: 130px; flex-shrink: 0; padding-top: 1px; }
.tech-items { font-size: 13.5px; color: var(--text-secondary); line-height: 1.7; }
/* ── Service cards ── */
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 8px; }
.service-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px 18px; transition: box-shadow 0.18s, border-color 0.18s; }
a.service-card { display: block; color: inherit; }
a.service-card, a.service-card:hover, a.service-card:focus, a.service-card:visited, a.service-card * { text-decoration: none; }
.service-card:hover { border-color: #c8c8c2; box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.service-icon { font-size: 22px; margin-bottom: 10px; display: block; }
.service-logo { height: 26px; width: auto; margin: 4px 0 15px; display: block; }
.service-logo.round { height: 34px; margin: 0 0 11px; }
.service-card h3 { font-size: 13.5px; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; letter-spacing: -0.01em; }
.service-card p { font-size: 12.5px; color: var(--text-secondary); line-height: 1.62; }
/* ── Connect ── */
.connect-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.connect-btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; font-size: 13.5px; font-weight: 500; color: var(--text-secondary); text-decoration: none; transition: all 0.15s; }
.connect-btn:hover { color: var(--text-primary); border-color: #c0c0ba; background: #f2f2ef; transform: translateY(-1px); box-shadow: 0 3px 10px rgba(0,0,0,0.07); }
.connect-btn svg { width: 15px; height: 15px; flex-shrink: 0; }
/* ── Cert rows ── */
.cert-table { display: flex; flex-direction: column; gap: 0; margin-top: 8px; }
.cert-row { display: flex; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--border-subtle); }
.cert-row:first-child { border-top: 1px solid var(--border-subtle); }
.cert-row { align-items: flex-start; }
.cert-provider { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 500; color: var(--text-primary); min-width: 176px; min-height: 24px; flex-shrink: 0; }
.cert-provider.no-logo { padding-left: 36px; }
.provider-logo { width: 28px; height: 22px; object-fit: contain; flex-shrink: 0; border-radius: 4px; }
.cert-items { font-size: 13.5px; color: var(--text-secondary); line-height: 1.78; }
/* ── Volunteering stats ── */
.vol-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 28px 0 0; }
.vol-stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 22px 20px 18px; text-align: center; transition: box-shadow 0.18s, border-color 0.18s; }
.vol-stat:hover { border-color: #c8c8c2; box-shadow: 0 4px 18px rgba(0,0,0,0.07); }
.vol-stat-num { font-family: var(--mono); font-size: 28px; font-weight: 500; color: var(--accent); letter-spacing: -0.03em; line-height: 1; margin-bottom: 7px; }
.vol-stat-label { font-size: 12.5px; color: var(--text-secondary); line-height: 1.5; }
.dot-live { width: 6px; height: 6px; border-radius: 50%; background: #22c55e; animation: blink 2.8s ease-in-out infinite; flex-shrink: 0; }
.subsection-kicker { font-family: var(--mono); font-size: 10.5px; font-weight: 500; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
.focus-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.focus-card ul { margin-top: 8px; padding-left: 16px; }
.focus-card li { font-size: 12.5px; color: var(--text-secondary); line-height: 1.7; }
/* ── Diagram cards ── */
.diagram-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 22px 22px 16px; margin-top: 18px; box-shadow: 0 1px 3px rgba(0,0,0,0.03); }
.diagram-card svg { width: 100%; height: auto; display: block; }
.diagram-caption { font-size: 12px; color: var(--text-muted); margin-top: 10px; line-height: 1.6; font-family: var(--mono); }
.diagram-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
/* ── Equation blocks ── */
.equation-block { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; padding: 16px 20px; margin-top: 16px; font-family: var(--mono); font-size: 14px; color: var(--text-primary); overflow-x: auto; }
.equation-block .eq-label { display: block; font-family: var(--sans); font-size: 11px; color: var(--text-muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.06em; }
/* ── Data table ── */
.data-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.data-table th, .data-table td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border-subtle); white-space: nowrap; }
.data-table th { font-family: var(--mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted); font-weight: 500; position: sticky; top: 0; background: var(--surface); }
.data-table td { color: var(--text-secondary); }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); margin-top: 16px; max-height: 420px; overflow-y: auto; }
.table-wrap .data-table { margin-top: 0; }
.table-wrap th, .table-wrap td { border-bottom: 1px solid var(--border-subtle); }
.table-wrap tr:last-child td { border-bottom: none; }
/* ── Bullet groups ── */
.bullet-group { margin-top: 14px; }
.bullet-group ul { padding-left: 18px; }
.bullet-group li { font-size: 14.5px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 4px; }
/* ── Two-column layout ── */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 20px; }
.research-name a { color: var(--accent); text-decoration: none; }
.research-name a:hover { text-decoration: underline; }
.research-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.research-date { font-family: var(--mono); font-size: 11px; font-weight: 500; color: var(--text-muted); white-space: nowrap; }
.research-body { display: flex; align-items: flex-start; gap: 16px; margin-top: 10px; }
.research-text { flex: 2; min-width: 0; font-size: 13px; font-weight: 400; color: var(--text-secondary); }
.research-text p + p { margin-top: 8px; }
.research-thumb { flex: 1; min-width: 0; display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.research-thumb:hover { text-decoration: none; border-color: #c8c8c2; }
.research-thumb img { display: block; width: 100%; height: auto; }
/* ── Person grid ── */
.person-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.person-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px 18px 16px; }
.person-card h4 { font-size: 13.5px; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.person-card p { font-size: 12.5px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 8px; }
.person-card a { font-family: var(--mono); font-size: 11px; color: var(--accent); text-decoration: none; }
.person-card a:hover { text-decoration: underline; }
.person-links { display: flex; flex-direction: column; gap: 2px; }
/* ── Tool grid ── */
.tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 16px; }
.tool-card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px 14px 12px; }
.tool-card h4 { font-size: 12.5px; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.tool-card p { font-size: 11.5px; color: var(--text-secondary); line-height: 1.55; margin-bottom: 6px; }
.tool-card a { font-family: var(--mono); font-size: 10.5px; color: var(--accent); text-decoration: none; }
.tool-card a:hover { text-decoration: underline; }
/* ── Citation block ── */
.citation-block { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border-subtle); }
.citation-block p { font-size: 11.5px; color: var(--text-muted); line-height: 1.7; margin-bottom: 6px; }
.citation-block a { color: var(--text-muted); }
/* ── Card grid ── */
.card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px 18px 16px; transition: box-shadow 0.18s, border-color 0.18s; }
.card:hover { border-color: #c8c8c2; box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.card .card-icon { font-size: 18px; margin-bottom: 8px; display: block; }
.card h3 { font-size: 13px; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; letter-spacing: -0.01em; }
.card p { font-size: 12.5px; color: var(--text-secondary); line-height: 1.6; }
/* ── Timeline-style flow list ── */
.flow-list { margin-top: 22px; display: flex; flex-direction: column; gap: 0; border-left: 1.5px solid var(--border); padding-left: 24px; }
.flow-item { position: relative; padding-bottom: 22px; }
.flow-item:last-child { padding-bottom: 0; }
.flow-item::before { content: ''; position: absolute; left: -29.5px; top: 3px; width: 8px; height: 8px; border-radius: 50%; background: var(--surface); border: 1.5px solid var(--border); }
.flow-item:first-child::before { border-color: var(--accent); background: var(--accent); }
.flow-label { font-family: var(--mono); font-size: 10.5px; font-weight: 500; color: var(--accent); letter-spacing: 0.04em; margin-bottom: 3px; text-transform: uppercase; }
.flow-text { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.flow-text strong { color: var(--text-primary); font-weight: 500; }
.citation-block a:hover { text-decoration: underline; }
.hero-kicker { font-size: 17px; color: var(--text-secondary); font-style: italic; margin-bottom: 18px; }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.card h4 { font-size: 11.5px; font-weight: 600; color: var(--accent); margin: 10px 0 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.card ul { padding-left: 16px; margin-top: 4px; }
.card li { font-size: 12.5px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 2px; }
.card .card-meta { font-family: var(--mono); font-size: 10.5px; color: var(--text-muted); margin-top: 8px; }
.card a { color: var(--accent); text-decoration: none; }
.card a:hover { text-decoration: underline; }
/* ── Stat cards ── */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 18px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px 16px 14px; text-align: left; }
.stat-card .stat-num { font-family: var(--mono); font-size: 20px; font-weight: 600; color: var(--accent); letter-spacing: -0.01em; }
.stat-card .stat-label { font-size: 11.5px; color: var(--text-secondary); margin-top: 4px; line-height: 1.5; }
.stat-callout { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 0 12px 12px 0; padding: 16px 20px; margin-top: 18px; font-size: 15px; color: var(--text-primary); }
.stat-callout strong { color: var(--accent); }
/* ── Numbered reason list ── */
.reason-list { margin-top: 20px; display: flex; flex-direction: column; gap: 0; }
.reason-item { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border-subtle); }
.reason-item:first-child { border-top: 1px solid var(--border-subtle); }
.reason-num { font-family: var(--mono); font-size: 13px; font-weight: 600; color: var(--accent); min-width: 26px; padding-top: 2px; }
.reason-body h4 { font-size: 14.5px; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.reason-body ul { padding-left: 16px; }
.reason-body li { font-size: 13.5px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 3px; }
/* ── Timeline v2 (rich vertical) ── */
.timeline-v2 { position: relative; margin-top: 24px; padding-left: 26px; border-left: 1.5px solid var(--border); }
.tl-item { position: relative; padding-bottom: 26px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before { content: ''; position: absolute; left: -31px; top: 3px; width: 9px; height: 9px; border-radius: 50%; background: var(--surface); border: 2px solid var(--accent); }
.tl-year { font-family: var(--mono); font-size: 11px; font-weight: 600; color: var(--accent); letter-spacing: 0.03em; margin-bottom: 3px; }
.tl-title { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 3px; }
.tl-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
/* ── Mini horizontal timeline (NLP evolution strip) ── */
.mini-timeline { display: flex; align-items: flex-end; gap: 0; margin-top: 20px; overflow-x: auto; padding-bottom: 6px; }
.mini-tl-item { flex: 1; min-width: 90px; text-align: center; position: relative; padding-top: 14px; }
.mini-tl-item::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.mini-tl-item::after { content: ''; position: absolute; top: 3px; left: 0; right: 0; height: 1px; background: var(--border); z-index: -1; }
.mini-tl-item:first-child::after { left: 50%; }
.mini-tl-item:last-child::after { right: 50%; }
.mini-tl-label { font-size: 11.5px; font-weight: 600; color: var(--text-primary); margin-bottom: 2px; }
.mini-tl-year { font-family: var(--mono); font-size: 10px; color: var(--text-muted); }
.table-wrap.short { max-height: none; }
.three-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 18px; }
.research-group-title { font-family: var(--mono); font-size: 11px; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 26px; margin-bottom: 4px; }
.research-group-title:first-child { margin-top: 0; }
/* ── Vector display ── */
.vector-strip { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 14px; }
.vector-cell { font-family: var(--mono); font-size: 11px; color: var(--text-secondary); background: var(--accent-light); border-radius: 4px; padding: 4px 7px; }
.citation-block .cite-link { font-family: var(--mono); font-size: 11px; color: var(--accent); }
/* ── Wide layout (nav/footer align with .container.wide) ── */
.nav-inner.wide, .footer-inner.wide { max-width: 920px; }
.nav-inner.wide { overflow-x: auto; }
.nav-inner.wide .nav-links { flex-wrap: nowrap; }
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
/* ── Responsive ── */
@media (max-width: 560px) {
  .hero { padding: 52px 0 40px; }
  .hero.hero-home { padding: 60px 0 48px; }
  section { padding: 44px 0; }
  .nav-links { gap: 14px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .service-grid { grid-template-columns: 1fr; }
  .research-body { flex-direction: column; }
  .research-text, .research-thumb { flex: none; width: 100%; }
  .tech-row { flex-direction: column; gap: 4px; }
  .tech-category { min-width: auto; }
  .cert-row { flex-direction: column; gap: 4px; }
  .cert-provider { min-width: auto; }
  .vol-stats { grid-template-columns: 1fr; }
  .focus-grid, .focus-grid.cols-3 { grid-template-columns: 1fr; }
  .person-grid { grid-template-columns: 1fr; }
  .reason-item { flex-direction: column; gap: 6px; }
}
@media (max-width: 640px) {
  .diagram-row { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 28px; }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .card-grid.cols-3, .card-grid.cols-4 { grid-template-columns: 1fr 1fr; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .two-col, .three-col { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 520px) {
  .card-grid, .card-grid.cols-3, .card-grid.cols-4 { grid-template-columns: 1fr; }
}