/* ============================================================
   FreakOnomics — Economics & Data Culture Blog
   Design System
   ============================================================ */

:root {
  --ink: #1C1C1C;
  --ink-soft: #2a2a2a;
  --chart-green: #2ECC71;
  --chart-green-dark: #27AE60;
  --data-orange: #E67E22;
  --data-orange-dark: #D35400;
  --paper: #FAFAFA;
  --paper-warm: #F4F4F1;
  --slate: #475569;
  --slate-light: #94a3b8;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --max-width: 1200px;
  --max-width-narrow: 760px;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(28,28,28,.06), 0 1px 2px rgba(28,28,28,.04);
  --shadow-md: 0 4px 14px rgba(28,28,28,.08), 0 2px 6px rgba(28,28,28,.05);
  --shadow-lg: 0 18px 50px rgba(28,28,28,.14), 0 6px 18px rgba(28,28,28,.08);
  --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-body: 'Source Sans 3', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--data-orange-dark); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--ink); }
h1, h2, h3, h4, h5 { font-family: var(--font-display); line-height: 1.18; font-weight: 700; letter-spacing: -.02em; color: var(--ink); }
h1 { font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.6rem); }
p { margin-bottom: 1.1em; }
ul, ol { margin-bottom: 1.1em; padding-left: 1.4em; }
li { margin-bottom: .4em; }
strong { font-weight: 700; color: var(--ink); }
em { font-style: italic; }
blockquote { border-left: 4px solid var(--chart-green); padding: .4em 1.2em; margin: 1.5em 0; font-style: italic; color: var(--slate); background: var(--paper-warm); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
code { font-family: var(--mono); background: var(--ink); color: var(--chart-green); padding: .12em .4em; border-radius: 4px; font-size: .88em; }
hr { border: none; border-top: 1px solid var(--border); margin: 2.2em 0; }

/* ===== Layout ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: var(--max-width-narrow); margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; }
.section-sm { padding: 40px 0; }
.section-tight { padding: 28px 0; }
.center { text-align: center; }
.muted { color: var(--slate); }
.eyebrow {
  font-family: var(--font-display);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--data-orange);
  margin-bottom: 12px;
  display: inline-block;
}
.section-title { margin-bottom: 12px; }
.section-lead { color: var(--slate); font-size: 1.12rem; max-width: 640px; margin-bottom: 40px; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,250,250,.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-logo { width: 40px; height: 40px; flex-shrink: 0; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.32rem; letter-spacing: -.03em; color: var(--ink); }
.brand-name span { color: var(--chart-green); }
.nav-menu { display: flex; align-items: center; gap: 4px; list-style: none; padding: 0; margin: 0; flex-wrap: wrap; }
.nav-menu a {
  font-family: var(--font-display);
  font-size: .9rem;
  font-weight: 600;
  color: var(--slate);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all .2s ease;
}
.nav-menu a:hover { color: var(--ink); background: var(--paper-warm); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--ink); border-radius: 2px;
  transition: all .3s ease; position: relative;
}
.nav-toggle span + span { margin-top: 5px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  padding: 12px 24px; border-radius: var(--radius-sm);
  transition: all .25s ease; cursor: pointer; border: 2px solid transparent;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--chart-green); color: var(--ink); }
.btn-outline { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn-outline:hover { background: var(--ink); color: var(--paper); }
.btn-ghost { color: var(--slate); }
.btn-ghost:hover { color: var(--ink); }

/* ===== Hero ===== */
.hero {
  background: var(--ink);
  color: var(--paper);
  padding: 70px 0 64px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(46,204,113,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46,204,113,.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
.hero h1 { color: var(--paper); margin-bottom: 20px; }
.hero h1 .hl { color: var(--chart-green); }
.hero .tagline { font-size: 1.22rem; color: rgba(250,250,250,.78); margin-bottom: 28px; max-width: 540px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .btn-primary { background: var(--chart-green); color: var(--ink); }
.hero .btn-primary:hover { background: var(--data-orange); color: var(--paper); }
.hero .btn-outline { border-color: rgba(250,250,250,.4); color: var(--paper); }
.hero .btn-outline:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.hero-art { display: flex; justify-content: center; }
.hero-art svg { max-width: 420px; width: 100%; }

/* ===== Stat Ticker ===== */
.ticker {
  background: var(--paper-warm);
  border-top: 3px solid var(--chart-green);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  padding: 18px 0;
}
.ticker-label {
  font-family: var(--font-display); font-weight: 700; font-size: .74rem;
  letter-spacing: .16em; text-transform: uppercase; color: var(--data-orange);
  text-align: center; margin-bottom: 10px;
}
.ticker-track {
  display: flex; gap: 48px; white-space: nowrap;
  animation: ticker 38s linear infinite;
  width: max-content;
}
.ticker-item { display: inline-flex; align-items: baseline; gap: 8px; }
.ticker-num { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; color: var(--ink); }
.ticker-desc { font-size: .88rem; color: var(--slate); }
@keyframes ticker { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ===== Featured Analysis ===== */
.featured-card {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-md); transition: transform .3s ease, box-shadow .3s ease;
}
.featured-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.featured-img { background: var(--ink); display: flex; align-items: center; justify-content: center; min-height: 320px; }
.featured-img img, .featured-img svg { width: 100%; height: 100%; object-fit: cover; }
.featured-body { padding: 40px; display: flex; flex-direction: column; justify-content: center; }
.featured-body .eyebrow { color: var(--chart-green-dark); }
.featured-body h2 { margin-bottom: 14px; }
.featured-body p { color: var(--slate); margin-bottom: 22px; }
.read-more {
  font-family: var(--font-display); font-weight: 600; font-size: .92rem;
  color: var(--ink); display: inline-flex; align-items: center; gap: 6px;
  border-bottom: 2px solid var(--chart-green); padding-bottom: 2px;
  width: fit-content;
}
.read-more:hover { color: var(--chart-green-dark); }
.read-more::after { content: "→"; transition: transform .2s; }
.read-more:hover::after { transform: translateX(4px); }

/* ===== Topic Cards ===== */
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.topic-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; text-decoration: none; color: var(--ink);
  transition: all .25s ease; position: relative; overflow: hidden;
}
.topic-card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
  background: var(--chart-green); transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.topic-card:hover { border-color: var(--border-strong); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.topic-card:hover::before { transform: scaleX(1); }
.topic-card .topic-icon { width: 44px; height: 44px; margin-bottom: 16px; }
.topic-card h3 { font-size: 1.18rem; margin-bottom: 8px; }
.topic-card p { font-size: .92rem; color: var(--slate); margin-bottom: 0; }
.topic-card .topic-count {
  font-family: var(--font-display); font-size: .78rem; font-weight: 700;
  color: var(--data-orange); letter-spacing: .06em; text-transform: uppercase; margin-top: 14px; display: block;
}

/* ===== Data Viz Section ===== */
.dataviz {
  background: var(--ink); color: var(--paper); padding: 72px 0;
}
.dataviz h2 { color: var(--paper); }
.dataviz .section-lead { color: rgba(250,250,250,.7); }
.dataviz-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; margin-top: 40px; }
.dataviz-card {
  background: var(--ink-soft); border: 1px solid rgba(250,250,250,.1);
  border-radius: var(--radius); padding: 28px; transition: border-color .25s;
}
.dataviz-card:hover { border-color: var(--chart-green); }
.dataviz-card h3 { color: var(--paper); font-size: 1.15rem; margin-bottom: 6px; }
.dataviz-card .dv-sub { color: var(--slate-light); font-size: .88rem; margin-bottom: 20px; }
.dataviz-card svg { width: 100%; height: auto; }

/* ===== Article Cards Grid ===== */
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.article-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; text-decoration: none; color: var(--ink);
  transition: all .25s ease; display: flex; flex-direction: column;
}
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--border-strong); }
.article-card-img { background: var(--ink); aspect-ratio: 16/9; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.article-card-img svg { width: 100%; height: 100%; }
.article-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.article-card .cat-tag {
  font-family: var(--font-display); font-size: .72rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--data-orange);
  margin-bottom: 10px;
}
.article-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.article-card p { font-size: .94rem; color: var(--slate); margin-bottom: 16px; flex: 1; }
.article-card .meta { font-size: .82rem; color: var(--slate-light); display: flex; gap: 12px; align-items: center; }

/* ===== Category tag pills ===== */
.cat-pills { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.cat-pill {
  font-family: var(--font-display); font-size: .82rem; font-weight: 600;
  padding: 7px 16px; border-radius: 999px; border: 1px solid var(--border-strong);
  color: var(--slate); background: var(--paper); cursor: pointer;
  transition: all .2s; text-decoration: none;
}
.cat-pill:hover, .cat-pill.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ===== Article Page Layout ===== */
.article-hero { background: var(--ink); color: var(--paper); padding: 60px 0 48px; position: relative; overflow: hidden; }
.article-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(46,204,113,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(46,204,113,.05) 1px, transparent 1px);
  background-size: 44px 44px;
}
.article-hero .container-narrow { position: relative; z-index: 1; }
.article-hero .cat-tag { font-family: var(--font-display); font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--chart-green); margin-bottom: 16px; display: inline-block; }
.article-hero h1 { color: var(--paper); margin-bottom: 18px; }
.article-hero .article-meta { display: flex; gap: 18px; align-items: center; font-size: .9rem; color: rgba(250,250,250,.65); flex-wrap: wrap; }
.article-hero .article-meta .dot { width: 4px; height: 4px; background: var(--slate-light); border-radius: 50%; }
.article-hero .read-time { color: var(--data-orange); font-weight: 600; }

.article-body { padding: 56px 0; }
.article-body .lead {
  font-size: 1.25rem; line-height: 1.6; color: var(--ink);
  font-weight: 400; margin-bottom: 32px; padding-bottom: 28px; border-bottom: 1px solid var(--border);
}
.article-body h2 { margin-top: 2.2em; margin-bottom: .6em; font-size: 1.55rem; }
.article-body h3 { margin-top: 1.8em; margin-bottom: .5em; font-size: 1.25rem; }
.article-body p { font-size: 1.06rem; }
.article-body ul, .article-body ol { font-size: 1.06rem; }
.article-illustration { margin: 36px 0; border-radius: var(--radius); overflow: hidden; background: var(--ink); }
.article-illustration svg { width: 100%; height: auto; }
.article-illustration figcaption { font-size: .86rem; color: var(--slate); padding: 12px 16px; background: var(--paper-warm); text-align: center; }
.callout {
  background: var(--paper-warm); border-left: 4px solid var(--data-orange);
  padding: 22px 26px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 28px 0;
}
.callout .callout-label { font-family: var(--font-display); font-weight: 700; font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; color: var(--data-orange); margin-bottom: 6px; }
.callout p { margin-bottom: 0; color: var(--ink); }
.data-table { width: 100%; border-collapse: collapse; margin: 28px 0; font-size: .94rem; }
.data-table th, .data-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th { background: var(--ink); color: var(--paper); font-family: var(--font-display); font-weight: 600; font-size: .84rem; letter-spacing: .04em; }
.data-table tr:hover { background: var(--paper-warm); }
.stat-inline { font-family: var(--font-display); font-weight: 700; color: var(--chart-green-dark); }

/* ===== Article footer / tags / nav ===== */
.article-footer { border-top: 1px solid var(--border); padding-top: 32px; margin-top: 48px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.tag { font-family: var(--font-display); font-size: .78rem; font-weight: 600; padding: 5px 12px; border-radius: 999px; background: var(--paper-warm); color: var(--slate); border: 1px solid var(--border); }
.article-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.article-nav a {
  padding: 20px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--paper); transition: all .2s; display: block;
}
.article-nav a:hover { border-color: var(--chart-green); box-shadow: var(--shadow-sm); }
.article-nav .nav-label { font-family: var(--font-display); font-size: .74rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--data-orange); margin-bottom: 6px; }
.article-nav .nav-title { font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1rem; }
.article-nav .next { text-align: right; }

/* ===== Related articles ===== */
.related { background: var(--paper-warm); padding: 60px 0; }

/* ===== Page Hero (non-article pages) ===== */
.page-hero { background: var(--ink); color: var(--paper); padding: 64px 0 56px; position: relative; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(46,204,113,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(46,204,113,.05) 1px, transparent 1px);
  background-size: 44px 44px;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--paper); margin-bottom: 14px; }
.page-hero p { color: rgba(250,250,250,.7); font-size: 1.15rem; max-width: 640px; }
.breadcrumb { font-size: .84rem; color: var(--slate-light); margin-bottom: 18px; }
.breadcrumb a { color: var(--chart-green); }
.breadcrumb a:hover { color: var(--paper); }

/* ===== About Page ===== */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; align-items: start; }
.about-content p { font-size: 1.08rem; }
.principles { list-style: none; padding: 0; }
.principles li { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border); }
.principles li:last-child { border-bottom: none; }
.principles .pnum { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; color: var(--chart-green); min-width: 36px; }
.principles h4 { font-size: 1.05rem; margin-bottom: 4px; }
.principles p { font-size: .92rem; color: var(--slate); margin: 0; }

/* ===== Contact Page ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.contact-form .field { margin-bottom: 22px; }
.contact-form label { display: block; font-family: var(--font-display); font-weight: 600; font-size: .9rem; margin-bottom: 8px; color: var(--ink); }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; padding: 13px 16px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); font-family: var(--font-body); font-size: 1rem;
  background: var(--paper); color: var(--ink); transition: border-color .2s;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus {
  outline: none; border-color: var(--chart-green); box-shadow: 0 0 0 3px rgba(46,204,113,.15);
}
.contact-form textarea { min-height: 150px; resize: vertical; }
.form-note { font-size: .84rem; color: var(--slate-light); margin-top: 6px; }
.form-success { display: none; background: var(--chart-green); color: var(--ink); padding: 16px 20px; border-radius: var(--radius-sm); font-weight: 600; margin-bottom: 20px; }
.form-success.show { display: block; }
.contact-info .info-item { display: flex; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--border); }
.contact-info .info-item:last-child { border-bottom: none; }
.contact-info .info-icon { width: 42px; height: 42px; flex-shrink: 0; }
.contact-info h4 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 4px; }
.contact-info p, .contact-info a { font-size: .96rem; color: var(--slate); }
.contact-info a:hover { color: var(--ink); }

/* ===== Legal / Text pages ===== */
.legal-body { padding: 56px 0; }
.legal-body h2 { margin-top: 2em; margin-bottom: .5em; font-size: 1.4rem; }
.legal-body h3 { margin-top: 1.6em; margin-bottom: .4em; font-size: 1.15rem; }
.legal-body p, .legal-body li { font-size: 1.02rem; }
.legal-body .updated { font-family: var(--font-display); font-size: .86rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--data-orange); margin-bottom: 28px; }
.toc { background: var(--paper-warm); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 22px 26px; margin-bottom: 36px; }
.toc h4 { font-family: var(--font-display); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--data-orange); margin-bottom: 10px; }
.toc ol { margin: 0; font-size: .94rem; }
.toc a { color: var(--slate); }
.toc a:hover { color: var(--ink); }

/* ===== Sitemap page ===== */
.sitemap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.sitemap-col h3 { font-size: 1.05rem; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--chart-green); }
.sitemap-col ul { list-style: none; padding: 0; }
.sitemap-col li { margin-bottom: 10px; }
.sitemap-col a { font-size: .96rem; color: var(--slate); }
.sitemap-col a:hover { color: var(--ink); }

/* ===== Topics page ===== */
.topics-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.topic-detail-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; transition: all .25s; display: flex; gap: 20px; align-items: flex-start;
}
.topic-detail-card:hover { box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.topic-detail-card .td-icon { width: 56px; height: 56px; flex-shrink: 0; }
.topic-detail-card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.topic-detail-card p { font-size: .92rem; color: var(--slate); margin-bottom: 12px; }
.topic-detail-card .topic-links { font-family: var(--font-display); font-size: .82rem; font-weight: 600; color: var(--data-orange); }

/* ===== 404 ===== */
.error-page { min-height: 60vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 60px 0; }
.error-code { font-family: var(--font-display); font-size: clamp(5rem, 18vw, 11rem); font-weight: 700; line-height: 1; color: var(--ink); letter-spacing: -.04em; }
.error-code .o { color: var(--chart-green); }
.error-code .o2 { color: var(--data-orange); }

/* ===== Newsletter (subtle) ===== */
.newsletter {
  background: var(--ink); color: var(--paper); padding: 60px 0;
  text-align: center; position: relative; overflow: hidden;
}
.newsletter::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(46,204,113,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(46,204,113,.04) 1px, transparent 1px);
  background-size: 44px 44px;
}
.newsletter .container { position: relative; z-index: 1; }
.newsletter h2 { color: var(--paper); margin-bottom: 12px; }
.newsletter p { color: rgba(250,250,250,.7); max-width: 520px; margin: 0 auto 28px; }
.newsletter-form { display: flex; gap: 10px; max-width: 460px; margin: 0 auto; flex-wrap: wrap; }
.newsletter-form input {
  flex: 1; min-width: 200px; padding: 13px 18px; border-radius: var(--radius-sm);
  border: 1px solid rgba(250,250,250,.2); background: rgba(250,250,250,.06); color: var(--paper);
  font-family: var(--font-body); font-size: 1rem;
}
.newsletter-form input::placeholder { color: rgba(250,250,250,.5); }
.newsletter-form input:focus { outline: none; border-color: var(--chart-green); }
.newsletter-form .btn-primary { background: var(--chart-green); color: var(--ink); }
.newsletter-form .btn-primary:hover { background: var(--data-orange); color: var(--paper); }
.newsletter .nl-note { font-size: .82rem; color: var(--slate-light); margin-top: 14px; }

/* ===== Footer ===== */
.site-footer { background: var(--ink); color: rgba(250,250,250,.6); padding: 56px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand .brand-name { color: var(--paper); }
.footer-brand p { font-size: .92rem; max-width: 320px; }
.footer-col h4 { font-family: var(--font-display); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--chart-green); margin-bottom: 16px; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: rgba(250,250,250,.6); font-size: .92rem; }
.footer-col a:hover { color: var(--paper); }
.footer-bottom { border-top: 1px solid rgba(250,250,250,.1); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; font-size: .84rem; }
.footer-bottom .disclaimer { max-width: 600px; }
.footer-bottom .disclaimer a { color: var(--chart-green); }

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-art { order: -1; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .dataviz-grid { grid-template-columns: 1fr; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-img { min-height: 240px; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .sitemap-grid { grid-template-columns: 1fr 1fr; }
  .topics-list { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  body { font-size: 17px; }
  .nav-menu {
    position: fixed; top: 64px; left: 0; right: 0; bottom: 0;
    background: var(--paper); flex-direction: column; align-items: stretch;
    padding: 20px 24px; gap: 4px; transform: translateX(100%);
    transition: transform .3s ease; overflow-y: auto; border-top: 1px solid var(--border);
  }
  .nav-menu.open { transform: translateX(0); }
  .nav-menu a { padding: 14px 12px; font-size: 1rem; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: block; }
  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .section { padding: 48px 0; }
  .topic-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .article-nav { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .sitemap-grid { grid-template-columns: 1fr; }
  .container, .container-narrow { padding: 0 18px; }
  .ticker-track { animation-duration: 28s; }
  .article-body .lead { font-size: 1.12rem; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .ticker-track { animation: none; }
  .hero::before, .article-hero::before, .page-hero::before, .newsletter::before { animation: none; }
}