@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #09090b;
  --bg-card: rgba(255,255,255,0.03);
  --bg-card-border: rgba(255,255,255,0.06);
  --bg-card-hover: rgba(255,255,255,0.05);
  --fg: #a1a1aa;
  --fg-bright: #fafafa;
  --fg-muted: #52525b;
  --accent: #3b82f6;
  --accent-glow: rgba(59,130,246,0.15);
  --border: rgba(255,255,255,0.06);
  --sans: 'Inter', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --serif: 'Newsreader', Georgia, serif;
  --max: 72rem;
  --measure: 42rem;
  --pastel-coral: #ff9b8e;
  --pastel-coral-dim: rgba(255,155,142,0.12);
  --pastel-coral-glow: rgba(255,155,142,0.06);
  --pastel-mint: #7edcb5;
  --pastel-mint-dim: rgba(126,220,181,0.12);
  --pastel-mint-glow: rgba(126,220,181,0.06);
  --pastel-violet: #b4a0f4;
  --pastel-violet-dim: rgba(180,160,244,0.12);
  --pastel-violet-glow: rgba(180,160,244,0.06);
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { background: var(--bg); color: var(--fg); font-family: var(--sans); line-height: 1.6; }

.nav { max-width: var(--max); margin: 0 auto; padding: 1.5rem 2rem; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-family: var(--mono); font-size: 0.8rem; color: var(--fg-muted); text-decoration: none; letter-spacing: 0.05em; }
.nav-logo:hover { color: var(--fg); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 0.85rem; font-weight: 500; color: var(--fg-muted); text-decoration: none; transition: color 0.15s; }
.nav-links a:hover { color: var(--fg-bright); }
.nav-links a.active { color: var(--fg-bright); }
.nav-links a.ext { opacity: 0.4; }
.nav-links a.ext:hover { opacity: 0.8; }

.hero { max-width: var(--max); margin: 0 auto; padding: 8rem 2rem 6rem; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 900; color: var(--fg-bright); line-height: 1.0; letter-spacing: -0.04em; max-width: 16ch; margin-bottom: 1.5rem; }
.hero-sub { font-size: 1.25rem; font-weight: 400; color: var(--fg); max-width: 38ch; line-height: 1.6; }

.pillars { max-width: var(--max); margin: 0 auto; padding: 0 2rem 6rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }

.pillar-link { text-decoration: none; color: inherit; display: block; border-radius: 20px; transition: transform 0.25s cubic-bezier(0.22,1,0.36,1), box-shadow 0.3s ease; }
.pillar-link:hover { transform: translateY(-6px); }
.pillar-link:hover .pillar { border-color: rgba(255,255,255,0.12); background: var(--bg-card-hover); }
.pillar-link:nth-child(1):hover .pillar { box-shadow: 0 16px 48px rgba(255,155,142,0.06); }
.pillar-link:nth-child(2):hover .pillar { box-shadow: 0 16px 48px rgba(126,220,181,0.06); }
.pillar-link:nth-child(3):hover .pillar { box-shadow: 0 16px 48px rgba(180,160,244,0.06); }

.pillar { padding: 2.5rem; border: 1px solid var(--bg-card-border); border-radius: 20px; background: var(--bg-card); transition: border-color 0.2s, background 0.2s, box-shadow 0.3s; display: flex; flex-direction: column; height: 100%; }

.pillar-illustration { width: 100%; height: 180px; border-radius: 12px; margin-bottom: 1.75rem; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.pillar-illustration svg { width: 100%; height: 100%; }
.pillar-illustration--problem { background: var(--pastel-coral-glow); }
.pillar-illustration--framework { background: var(--pastel-mint-glow); }
.pillar-illustration--impact { background: var(--pastel-violet-glow); }

.pillar-tag { display: inline-block; font-family: var(--mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1.25rem; }
.pillar-tag--problem { color: var(--pastel-coral); }
.pillar-tag--framework { color: var(--pastel-mint); }
.pillar-tag--impact { color: var(--pastel-violet); }

.pillar h2 { font-size: 1.5rem; font-weight: 700; color: var(--fg-bright); line-height: 1.2; margin-bottom: 1rem; letter-spacing: -0.02em; }
.pillar p { font-size: 0.95rem; color: var(--fg); line-height: 1.7; margin-bottom: 0.75rem; }
.pillar p:last-child { margin-bottom: 0; }
.pillar em { color: var(--fg-bright); font-style: italic; }

.pillar-cta { margin-top: auto; padding-top: 1.5rem; font-family: var(--mono); font-size: 0.75rem; font-weight: 500; letter-spacing: 0.06em; display: flex; align-items: center; gap: 0.5rem; transition: gap 0.2s ease; }
.pillar-link:hover .pillar-cta { gap: 0.85rem; }
.pillar-cta--problem { color: var(--pastel-coral); }
.pillar-cta--framework { color: var(--pastel-mint); }
.pillar-cta--impact { color: var(--pastel-violet); }

.how { max-width: var(--max); margin: 0 auto; padding: 5rem 2rem 4rem; border-top: 1px solid var(--border); }
.how-header { margin-bottom: 3rem; }
.section-tag { display: inline-block; font-family: var(--mono); font-size: 0.7rem; font-weight: 500; color: var(--fg-muted); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1rem; }
.how-header h2 { font-size: 2.5rem; font-weight: 800; color: var(--fg-bright); letter-spacing: -0.03em; margin-bottom: 0.75rem; }
.how-header p { font-size: 1.1rem; color: var(--fg); }
.tier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-bottom: 3rem; }
.tier { padding: 2rem; border: 1px solid var(--bg-card-border); border-radius: 12px; background: var(--bg-card); }
.tier-label { font-family: var(--mono); font-size: 0.7rem; font-weight: 500; color: var(--accent); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.75rem; }
.tier h3 { font-size: 1.25rem; font-weight: 700; color: var(--fg-bright); margin-bottom: 0.75rem; }
.tier p { font-size: 0.9rem; color: var(--fg); line-height: 1.65; }
.bootstrap-prompt { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; margin: 1rem 0 0.75rem; overflow-x: auto; }
.bootstrap-prompt code { font-family: var(--mono); font-size: 0.8rem; color: var(--fg-bright); line-height: 1.6; word-break: break-all; }
.bootstrap-prompt a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.bootstrap-prompt a:hover { color: var(--fg-bright); }
.bootstrap-note { font-size: 0.78rem; color: var(--fg-muted); margin-bottom: 0; font-style: italic; }

.principles { max-width: var(--max); margin: 0 auto; padding: 5rem 2rem; border-top: 1px solid var(--border); }
.principle-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; margin-top: 2rem; }
.principle { padding: 2rem; border: 1px solid var(--bg-card-border); border-radius: 14px; background: var(--bg-card); }
.principle h3 { font-size: 1.1rem; font-weight: 600; color: var(--fg-bright); margin-bottom: 0.5rem; }
.principle .principle-origin { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); letter-spacing: 0.06em; margin-bottom: 0.75rem; opacity: 0.7; }
.principle p { font-size: 0.95rem; color: var(--fg); line-height: 1.65; }

.evidence { max-width: var(--max); margin: 0 auto; padding: 5rem 2rem; border-top: 1px solid var(--border); }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 2rem; margin-bottom: 2rem; }
.stat { text-align: center; }
.stat-number { font-family: var(--mono); font-size: 3.5rem; font-weight: 700; color: var(--accent); line-height: 1; margin-bottom: 0.5rem; }
.stat-label { font-size: 0.9rem; color: var(--fg); line-height: 1.5; }
.stat-source { text-align: center; font-family: var(--mono); font-size: 0.75rem; color: var(--fg-muted); }
.stat-source a { color: var(--fg-muted); text-decoration: underline; text-underline-offset: 2px; }
.stat-source a:hover { color: var(--fg); }

.cta { max-width: var(--max); margin: 0 auto; padding: 5rem 2rem; border-top: 1px solid var(--border); text-align: center; }
.cta h2 { font-size: 2rem; font-weight: 800; color: var(--fg-bright); letter-spacing: -0.03em; margin-bottom: 1rem; }
.cta p { font-size: 1rem; color: var(--fg); max-width: 36rem; margin: 0 auto 2rem; line-height: 1.6; }
.cta-button { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 1rem; font-weight: 600; color: var(--fg-bright); background: var(--accent); padding: 0.9rem 2rem; border-radius: 10px; text-decoration: none; transition: background 0.15s, box-shadow 0.15s; box-shadow: 0 0 20px var(--accent-glow); }
.cta-button:hover { background: #2563eb; box-shadow: 0 0 30px rgba(59,130,246,0.25); }

.footer { max-width: var(--max); margin: 0 auto; padding: 2rem; border-top: 1px solid var(--border); font-size: 0.8rem; color: var(--fg-muted); }

/* ═══ PILLAR PAGES ═══ */
.pillar-back { max-width: var(--max); margin: 0 auto; padding: 4rem 2rem 0; }
.pillar-back a { font-family: var(--mono); font-size: 0.8rem; color: var(--fg-muted); text-decoration: none; display: inline-flex; align-items: center; gap: 0.5rem; transition: color 0.15s; }
.pillar-back a:hover { color: var(--fg-bright); }

.pillar-hero { max-width: var(--max); margin: 0 auto; padding: 3rem 2rem 4rem; display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.pillar-hero__text { max-width: 32rem; }
.pillar-hero__tag { display: inline-block; font-family: var(--mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1.25rem; padding: 0.35rem 0.75rem; border-radius: 6px; }
.pillar-hero__tag--problem { color: var(--pastel-coral); background: var(--pastel-coral-dim); }
.pillar-hero__tag--framework { color: var(--pastel-mint); background: var(--pastel-mint-dim); }
.pillar-hero__tag--impact { color: var(--pastel-violet); background: var(--pastel-violet-dim); }
.pillar-hero h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 900; color: var(--fg-bright); line-height: 1.05; letter-spacing: -0.04em; margin-bottom: 1.25rem; }
.pillar-hero__sub { font-size: 1.15rem; color: var(--fg); line-height: 1.7; }
.pillar-hero__graphic { display: flex; align-items: center; justify-content: center; border-radius: 24px; padding: 3rem; min-height: 320px; }
.pillar-hero__graphic--problem { background: var(--pastel-coral-glow); border: 1px solid rgba(255,155,142,0.08); }
.pillar-hero__graphic--framework { background: var(--pastel-mint-glow); border: 1px solid rgba(126,220,181,0.08); }
.pillar-hero__graphic--impact { background: var(--pastel-violet-glow); border: 1px solid rgba(180,160,244,0.08); }
.pillar-hero__graphic svg { width: 100%; max-width: 380px; height: auto; }

.pillar-section { max-width: var(--max); margin: 0 auto; padding: 5rem 2rem; border-top: 1px solid var(--border); }
.pillar-section--split { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.pillar-section--split-reverse { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.pillar-section--split-reverse .pillar-section__visual { order: -1; }
.pillar-section__tag { font-family: var(--mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1rem; }
.pillar-section__tag--problem { color: var(--pastel-coral); }
.pillar-section__tag--framework { color: var(--pastel-mint); }
.pillar-section__tag--impact { color: var(--pastel-violet); }
.pillar-section h2 { font-size: 2rem; font-weight: 800; color: var(--fg-bright); letter-spacing: -0.03em; margin-bottom: 1.25rem; line-height: 1.15; }
.pillar-section p { font-size: 1.05rem; color: var(--fg); line-height: 1.75; margin-bottom: 1.25rem; max-width: 38rem; }
.pillar-section p:last-child { margin-bottom: 0; }
.pillar-section strong { color: var(--fg-bright); font-weight: 600; }
.pillar-section em { color: var(--fg-bright); font-style: italic; }

.pillar-section__visual { display: flex; align-items: center; justify-content: center; border-radius: 16px; padding: 2.5rem; min-height: 260px; }
.pillar-section__visual--problem { background: var(--pastel-coral-glow); border: 1px solid rgba(255,155,142,0.06); }
.pillar-section__visual--framework { background: var(--pastel-mint-glow); border: 1px solid rgba(126,220,181,0.06); }
.pillar-section__visual--impact { background: var(--pastel-violet-glow); border: 1px solid rgba(180,160,244,0.06); }
.pillar-section__visual svg { width: 100%; max-width: 340px; height: auto; }

.pillar-callout { padding: 2rem 2.5rem; border-radius: 14px; margin: 0; }
.pillar-callout-section { max-width: var(--max); margin: 0 auto; padding: 0 2rem 2rem; }
.pillar-callout--problem { background: var(--pastel-coral-dim); border-left: 3px solid var(--pastel-coral); }
.pillar-callout--framework { background: var(--pastel-mint-dim); border-left: 3px solid var(--pastel-mint); }
.pillar-callout--impact { background: var(--pastel-violet-dim); border-left: 3px solid var(--pastel-violet); }
.pillar-callout p { font-family: var(--serif); font-size: 1.15rem; color: var(--fg-bright); line-height: 1.7; max-width: 100%; margin-bottom: 0; }

.pillar-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.pillar-step { padding: 1.75rem; border: 1px solid var(--bg-card-border); border-radius: 14px; background: var(--bg-card); }
.pillar-step__num { font-family: var(--mono); font-size: 2rem; font-weight: 700; line-height: 1; margin-bottom: 0.75rem; }
.pillar-step__num--problem { color: var(--pastel-coral); opacity: 0.4; }
.pillar-step__num--framework { color: var(--pastel-mint); opacity: 0.4; }
.pillar-step__num--impact { color: var(--pastel-violet); opacity: 0.4; }
.pillar-step h3 { font-size: 1rem; font-weight: 600; color: var(--fg-bright); margin-bottom: 0.5rem; }
.pillar-step p { font-size: 0.9rem; color: var(--fg); line-height: 1.6; margin-bottom: 0; max-width: 100%; }

.pillar-code { width: 100%; max-width: var(--max); margin: 2rem auto; padding: 0 2rem; }
.pillar-code pre { background: rgba(255,255,255,0.025); border: 1px solid var(--bg-card-border); border-radius: 14px; padding: 2rem 2.5rem; font-family: var(--mono); font-size: 0.85rem; line-height: 1.7; color: var(--fg); overflow-x: auto; width: 100%; }
.pillar-code code { font-family: inherit; }

/* ═══ ARTICLE ═══ */
.article { max-width: 48rem; margin: 0 auto; padding: 2rem 2rem 6rem; }
.article-header { margin-bottom: 4rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border); }
.article-header h1 { font-size: clamp(2.2rem, 5vw, 3rem); font-weight: 900; color: var(--fg-bright); line-height: 1.1; letter-spacing: -0.04em; margin-bottom: 0.75rem; }
.article-header .subtitle { font-size: 1.15rem; color: var(--fg); }
.article-body { font-family: var(--serif); font-size: 1.15rem; line-height: 1.85; color: var(--fg); }
.article-body h2 { font-family: var(--sans); font-size: 1.5rem; font-weight: 700; color: var(--fg-bright); margin-top: 4rem; margin-bottom: 1rem; padding-top: 2.5rem; border-top: 1px solid var(--border); letter-spacing: -0.02em; }
.article-body h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.article-body h3 { font-family: var(--sans); font-size: 1.6rem; font-weight: 800; color: var(--fg-bright); margin-top: 4rem; margin-bottom: 1rem; padding-top: 2.5rem; border-top: 1px solid var(--border); letter-spacing: -0.02em; }
.article-body h3:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.article-body p { margin-bottom: 1.3rem; }
.article-body strong { color: var(--fg-bright); font-weight: 600; }
.article-body ol, .article-body ul { margin-bottom: 1.3rem; padding-left: 1.5em; }
.article-body li { margin-bottom: 0.5rem; }
.article-body a { color: var(--accent); text-decoration: none; }
.article-body a:hover { opacity: 0.8; }
.article-body code { font-family: var(--mono); font-size: 0.85em; background: var(--bg-card); padding: 0.2em 0.4em; border-radius: 4px; color: var(--fg-bright); }
.article-body pre { background: rgba(255,255,255,0.03); border: 1px solid var(--bg-card-border); border-radius: 10px; padding: 1.5rem; margin: 2rem 0; overflow-x: auto; font-family: var(--mono); font-size: 0.85rem; line-height: 1.6; }
.article-body pre code { background: none; padding: 0; font-size: inherit; }
.article-body blockquote { border-left: 2px solid var(--accent); padding-left: 1.5rem; margin: 2rem 0; color: var(--fg-bright); font-style: italic; }
.article-body hr { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }
.article-footer { margin-top: 5rem; padding-top: 2rem; border-top: 1px solid var(--border); font-size: 0.85rem; color: var(--fg-muted); }

/* ═══ RESPONSIVE ═══ */
@media (max-width: 768px) {
  .nav { flex-direction: column; gap: 0.75rem; padding: 1.25rem 1.5rem; align-items: flex-start; }
  .nav-links { gap: 1rem; flex-wrap: wrap; }
  .nav-links a { font-size: 0.8rem; }
  .hero { padding: 5rem 1.5rem 4rem; }
  .hero h1 { font-size: 2.2rem; }
  .pillars { grid-template-columns: 1fr; padding: 0 1.5rem 4rem; }
  .tier-grid { grid-template-columns: 1fr; }
  .principle-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr; gap: 2.5rem; }
  .how, .principles, .evidence, .cta { padding-left: 1.5rem; padding-right: 1.5rem; }
  .article { padding: 2rem 1.5rem 4rem; }
  .article-header h1 { font-size: 1.8rem; }
  .article-body { font-size: 1.05rem; }
  .article-body h3 { font-size: 1.3rem; }
  .pillar-hero { grid-template-columns: 1fr; padding: 2rem 1.5rem 3rem; gap: 2.5rem; }
  .pillar-hero h1 { font-size: 2.2rem; }
  .pillar-hero__graphic { min-height: 220px; padding: 2rem; }
  .pillar-section--split, .pillar-section--split-reverse { grid-template-columns: 1fr; gap: 2rem; }
  .pillar-section--split-reverse .pillar-section__visual { order: 0; }
  .pillar-section { padding: 3.5rem 1.5rem; }
  .pillar-steps { grid-template-columns: 1fr; }
  .pillar-code { padding: 0 1.5rem; }
  .pillar-back { padding: 3rem 1.5rem 0; }
  .pillar-illustration { height: 140px; }
}

@media (max-width: 480px) {
  .nav-links { gap: 0.75rem; }
  .nav-links a { font-size: 0.75rem; }
}

::selection { background: rgba(59, 130, 246, 0.3); }