/* === Design Tokens === */
:root {
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --color-bg: #ffffff;
  --color-bg-warm: #F8F7F4;
  --color-black: #0a0a0a;
  --color-gold: #C9A227;
  --color-border: rgba(10, 10, 10, 0.1);

  --text-primary: #0a0a0a;
  --text-secondary: rgba(10, 10, 10, 0.55);
  --text-muted: rgba(10, 10, 10, 0.35);

  --content-width: 1100px;
  --text-width: 660px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* === Layout === */
.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 32px;
}

section {
  padding: 140px 0;
}

/* === Typography === */
h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h2 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 28px;
}

h3 {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 500;
  line-height: 1.25;
  color: var(--text-primary);
}

p {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: var(--text-width);
}

.section-label {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 32px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-name {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.25s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* === Hero === */
.hero {
  padding: 180px 0 100px;
  background: var(--color-bg);
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
}

.hero-meta span {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.meta-dot {
  font-size: 10px;
}

.hero h1 {
  max-width: 860px;
  margin-bottom: 20px;
}

.hero-sub {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 400;
  line-height: 1.3;
  color: var(--text-secondary);
  max-width: 600px;
  font-style: italic;
}

/* === Manifesto === */
.manifesto {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.manifesto-text {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.5vw, 28px);
  line-height: 1.55;
  color: var(--text-primary);
  max-width: 900px;
  text-align: center;
  margin: 0 auto;
}

.manifesto-text em {
  color: var(--text-secondary);
}

/* === About === */
.about {
  background: var(--color-bg-warm);
}

.about-text {
  margin-bottom: 72px;
}

.credentials {
  border-top: 1px solid var(--color-border);
  padding-top: 48px;
}

.credentials-heading {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.credential-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
}

.credential-row:last-child {
  border-bottom: none;
}

.credential-value {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.2;
}

.credential-desc {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* === Systems === */
.systems {
  background: var(--color-bg);
}

.systems-intro {
  margin-bottom: 80px;
}

/* Tabs */
.framework-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  margin-bottom: 0;
}

.tab {
  background: var(--color-bg);
  border: none;
  padding: 28px 24px;
  cursor: pointer;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.25s;
  font-family: var(--font-body);
}

.tab:hover {
  background: var(--color-bg-warm);
}

.tab.active {
  background: var(--color-bg-warm);
  border-bottom: 2px solid var(--color-gold);
}

.tab-numeral {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
}

.tab-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 500;
  color: var(--color-gold);
  line-height: 1.1;
}

.tab-role {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 400;
  font-style: italic;
  color: var(--text-secondary);
}

/* Panels */
.framework-panels {
  background: var(--color-bg-warm);
  border: 1px solid var(--color-border);
  border-top: none;
}

.panel {
  display: none;
  padding: 48px 40px;
}

.panel.active {
  display: block;
}

.panel-header {
  margin-bottom: 16px;
}

.framework-name {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 500;
  color: var(--color-gold);
  margin-bottom: 4px;
}

.framework-expand {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  max-width: none;
}

.panel-summary {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 0;
}

.framework-layers {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.framework-layer {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
}

.layer-letter {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-gold);
  line-height: 1.5;
}

.framework-layer div {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.framework-layer strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* === Work / Case Studies === */
.work {
  background: var(--color-bg-warm);
}

.work h2 {
  margin-bottom: 72px;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.case-card {
  background: var(--color-bg-warm);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  transition: background 0.3s;
}

.case-card:hover {
  background: var(--color-bg);
}

.case-number {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1;
  margin-bottom: 20px;
}

.case-stage {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.case-card h3 {
  font-size: 20px;
  line-height: 1.3;
  margin-bottom: 12px;
}

.case-card p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: none;
  flex-grow: 1;
}

.case-metrics {
  display: flex;
  gap: 24px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.case-stat {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-gold);
  line-height: 1.1;
}

.stat-label {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-top: 3px;
}

/* === Connect === */
.connect {
  background: var(--color-bg);
  text-align: center;
  padding: 160px 0;
}

.connect h2 {
  margin-bottom: 20px;
}

.connect-text {
  margin: 0 auto 40px;
  text-align: center;
  max-width: 480px;
}

.connect-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.connect-links a {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  text-decoration: none;
  background: var(--text-primary);
  padding: 14px 36px;
  border-radius: 6px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s;
}

.connect-links a:hover {
  border-bottom: 2px solid var(--color-gold);
}

.link-dot {
  font-size: 14px;
  color: var(--text-muted);
}

/* === Responsive === */
@media (max-width: 900px) {
  section {
    padding: 100px 0;
  }

  .hero {
    padding: 140px 0 80px;
  }

  .credential-row {
    grid-template-columns: 160px 1fr;
    gap: 20px;
  }

  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .framework-tabs {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 36px 28px;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 0 20px;
  }

  section {
    padding: 72px 0;
  }

  .hero {
    padding: 110px 0 60px;
  }

  .hero-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    margin-bottom: 28px;
  }

  .meta-dot {
    display: none;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 12px;
  }

  .credential-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .credential-value {
    font-size: 18px;
  }

  .cases-grid {
    grid-template-columns: 1fr;
  }

  .case-card {
    padding: 28px 24px;
  }

  .stat-value {
    font-size: 20px;
  }

  .tab {
    padding: 20px 24px;
  }

  .panel {
    padding: 28px 20px;
  }

  .framework-numeral {
    font-size: 24px;
  }

  .framework-name {
    font-size: 26px;
  }

  .connect {
    padding: 100px 0;
  }

  .connect-links {
    flex-direction: column;
    gap: 12px;
  }

  .link-dot {
    display: none;
  }

  .manifesto {
    padding: 56px 0;
  }

  .manifesto-text {
    text-align: left;
  }
}