/* business.huyhungstory.com — ideabrowser-inspired, minimal, no clutter. */

:root {
  --bg: #fafaf7;
  --bg-cream: #f3efe7;
  --bg-warm: #ffffff;
  --bg-dark: #111111;
  --text-primary: #111111;
  --text-muted: #555555;
  --text-light: #888888;
  --border: #e5e2dc;
  --accent: #ff5a1f;        /* rung accent (warm orange like ideabrowser) */
  --rung-1: #2563eb;
  --rung-2: #16a34a;
  --rung-3: #d97706;
  --rung-4: #7c3aed;
  --concept: #111111;
  --serif: 'Source Serif 4', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 720px; margin: 0 auto; padding: 0 24px; }

/* ── Nav ───────────────────────────────────────────────────────── */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}
.nav-logo-dot { color: var(--accent); }
.nav-links {
  list-style: none; padding: 0; margin: 0;
  display: flex; gap: 22px;
}
.nav-link {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}
.nav-link.is-active { color: var(--text-primary); }
.nav-right { display: flex; align-items: center; gap: 12px; }
.lang-toggle {
  display: inline-flex; gap: 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px;
  font-family: var(--mono);
  font-size: 0.72rem;
}
.lang-btn {
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--text-muted);
}
.lang-btn.is-active {
  background: var(--text-primary);
  color: var(--bg);
}
@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* ── Sections ───────────────────────────────────────────────────── */
.section-warm { background: var(--bg-warm); padding: 64px 0; border-top: 1px solid var(--border); }
.section-cream { background: var(--bg-cream); padding: 64px 0; border-top: 1px solid var(--border); }

.section-header { margin-bottom: 36px; }
.section-header-row {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
}
.section-label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}
.section-sub {
  font-size: 1.02rem;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0;
}

/* ── Hero ───────────────────────────────────────────────────────── */
.hero {
  background: var(--bg);
  padding: 88px 0 56px;
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  max-width: 980px; margin: 0 auto; padding: 0 24px;
}
.hero-eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--bg-cream);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 28px;
}
.hero-h1 {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5.6vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 0 0 24px;
}
.hero-sub {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-muted);
  max-width: 700px;
  line-height: 1.55;
  margin: 0 0 32px;
}
.hero-ctas { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
.btn-primary {
  display: inline-block;
  background: var(--text-primary);
  color: var(--bg) !important;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: transform 0.12s ease;
}
.btn-primary:hover { transform: translateY(-1px); color: var(--bg) !important; }
.btn-text {
  font-weight: 500;
  font-size: 0.95rem;
  border-bottom: 1.5px solid currentColor;
  padding-bottom: 1px;
}

/* ── Featured (Bottleneck of the Week) ─────────────────────────── */
.featured-card {
  display: block;
  background: var(--bg-warm);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  margin-top: 12px;
}
.featured-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px -16px rgba(0,0,0,0.18);
  color: var(--text-primary);
}
.featured-card-header {
  display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
  margin-bottom: 18px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.featured-time, .featured-saved { color: var(--text-muted); }
.featured-title {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.featured-excerpt {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0 0 18px;
}
.featured-who, .featured-tools {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin: 4px 0;
}
.featured-empty { color: var(--text-light); font-style: italic; }

/* ── Bottleneck grid ───────────────────────────────────────────── */
.bottlenecks-grid, .articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}
.bottleneck-card, .article-card {
  display: flex; flex-direction: column;
  background: var(--bg-warm);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.bottleneck-card:hover, .article-card:hover {
  transform: translateY(-2px);
  border-color: var(--text-primary);
  color: var(--text-primary);
}
.bottleneck-card-header, .article-meta {
  display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--text-muted);
}
.bottleneck-title, .article-title {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}
.bottleneck-excerpt, .article-excerpt {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0 0 18px;
  flex-grow: 1;
}
.bottleneck-card-foot {
  display: flex; gap: 12px; flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-light);
}
.bottleneck-saved { color: var(--accent); }

/* ── Rung badges ───────────────────────────────────────────────── */
.rung-badge, .rung-badge-sm {
  display: inline-block;
  font-family: var(--mono);
  font-weight: 500;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}
.rung-badge { padding: 5px 12px; font-size: 0.78rem; }
.rung-1 { background: rgba(37, 99, 235, 0.1); color: var(--rung-1); }
.rung-2 { background: rgba(22, 163, 74, 0.1); color: var(--rung-2); }
.rung-3 { background: rgba(217, 119, 6, 0.1); color: var(--rung-3); }
.rung-4 { background: rgba(124, 58, 237, 0.1); color: var(--rung-4); }
.rung-concept { background: rgba(17, 17, 17, 0.08); color: var(--concept); }

/* ── Concepts ──────────────────────────────────────────────────── */
.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.concept-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  background: var(--bg-warm);
  transition: border-color 0.12s ease;
}
.concept-card:hover { border-color: var(--text-primary); color: var(--text-primary); }
.concept-card-title {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 8px;
}
.concept-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}
.concepts-strip {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px dashed var(--border);
}
.concepts-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: 10px;
}
.concept-pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
  margin: 2px 4px 2px 0;
  color: var(--text-muted);
}
.concept-pill:hover { border-color: var(--text-primary); color: var(--text-primary); }

/* ── Articles index ────────────────────────────────────────────── */
.articles-header {
  padding: 72px 0 36px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.articles-h1 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  max-width: 800px;
}
.articles-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 0 24px;
}
.categories-nav { display: flex; flex-wrap: wrap; gap: 8px; }
.cat-pill {
  font-family: var(--mono);
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  color: var(--text-muted);
  background: var(--bg-warm);
}
.cat-pill.is-active { background: var(--text-primary); color: var(--bg); border-color: var(--text-primary); }
.articles-section { padding: 48px 0 80px; background: var(--bg); }
.pagination { margin-top: 40px; display: flex; gap: 6px; justify-content: center; }
.page-link {
  font-family: var(--mono);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
}
.page-link.is-active { background: var(--text-primary); color: var(--bg); }

/* ── Article page ──────────────────────────────────────────────── */
.article-page { background: var(--bg); }
.article-header { padding: 64px 0 28px; }
.article-meta-row {
  display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}
.article-dot { color: var(--text-light); }
.article-h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4.4vw, 3.2rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.article-lede {
  font-size: 1.18rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}
.stats-strip {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.stat {
  background: var(--bg-warm);
  padding: 14px 18px;
}
.stat-wide { grid-column: span 2; }
@media (max-width: 720px) { .stat-wide { grid-column: span 1; } }
.stat-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: 4px;
}
.stat-value {
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text-primary);
}
.article-body {
  padding: 28px 24px 64px;
  font-size: 1.05rem;
  line-height: 1.72;
  color: var(--text-primary);
}
.article-body h2 {
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 600;
  margin: 44px 0 14px;
  letter-spacing: -0.015em;
}
.article-body h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 32px 0 10px;
}
.article-body p { margin: 0 0 18px; }
.article-body ul, .article-body ol { margin: 0 0 18px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; }
.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 18px;
  margin: 24px 0;
  color: var(--text-muted);
  font-style: italic;
}
.article-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-cream);
  padding: 2px 6px;
  border-radius: 4px;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}
.article-body th, .article-body td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.article-body th {
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--bg-cream);
}
.article-body hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 36px 0;
}
.article-body a {
  color: var(--accent);
  border-bottom: 1px solid currentColor;
}

/* ── Related ───────────────────────────────────────────────────── */
.related {
  background: var(--bg-cream);
  padding: 56px 0;
  border-top: 1px solid var(--border);
}
.related-h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0 0 22px;
}
.related-list { display: grid; gap: 12px; }
.related-item {
  display: block;
  padding: 16px 18px;
  background: var(--bg-warm);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.related-item:hover { border-color: var(--text-primary); color: var(--text-primary); }
.related-cat {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-light);
  margin-bottom: 4px;
}
.related-title {
  display: block;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
}

/* ── Page body (about/products/services/contact) ───────────────── */
.page-body {
  padding: 64px 24px 80px;
  font-size: 1.05rem;
  line-height: 1.72;
}
.page-body h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.page-body h2 {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 40px 0 12px;
}
.page-body h3 { font-family: var(--serif); font-size: 1.2rem; margin: 28px 0 8px; }
.page-body p { margin: 0 0 18px; }
.page-body ul, .page-body ol { margin: 0 0 18px; padding-left: 24px; }
.page-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
}
.page-body th, .page-body td {
  text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border);
}
.page-body th {
  font-family: var(--mono); font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.06em;
  background: var(--bg-cream);
}
.page-body a { color: var(--accent); border-bottom: 1px solid currentColor; }
.page-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 18px; margin: 24px 0;
  color: var(--text-muted); font-style: italic;
}

/* ── Footer ────────────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-dark);
  color: #ddd;
  padding: 56px 0 36px;
  margin-top: 0;
}
.footer-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
}
.footer-brand {
  font-family: var(--mono);
  font-size: 0.95rem;
  margin: 0 0 18px;
  color: #fff;
}
.footer-links {
  list-style: none; padding: 0; margin: 0 0 24px;
  display: flex; flex-wrap: wrap; gap: 22px;
}
.footer-links a { color: #aaa; font-size: 0.92rem; }
.footer-links a:hover { color: #fff; }
.footer-email {
  font-family: var(--mono);
  color: #888;
  font-size: 0.88rem;
  margin: 0 0 14px;
}
.footer-copy {
  color: #666;
  font-size: 0.82rem;
  margin: 0;
}
.footer-copy a { color: #aaa; }