/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing */
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem;
  --space-4: 1rem; --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem; --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem; --space-20: 5rem; --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem; --radius-md: 0.5rem;
  --radius-lg: 0.75rem; --radius-xl: 1rem;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Content */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-display: 'General Sans', 'Satoshi', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Dark mode (default) */
:root, [data-theme="dark"] {
  --color-bg: #0e0f11;
  --color-surface: #16171b;
  --color-surface-2: #1c1d22;
  --color-surface-offset: #1a1b20;
  --color-border: #2a2b31;
  --color-divider: #222328;
  --color-text: #d1d1d6;
  --color-text-muted: #8a8a93;
  --color-text-faint: #55555e;
  --color-primary: #4fbcca;
  --color-primary-hover: #3aa3b0;
  --color-primary-active: #2d8a96;
  --color-primary-dim: rgba(79, 188, 202, 0.12);
  --color-warning: #d4943c;
  --color-error: #cf5f6a;
  --color-success: #5fb857;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

/* Light mode */
[data-theme="light"] {
  --color-bg: #f5f5f0;
  --color-surface: #ffffff;
  --color-surface-2: #fafaf8;
  --color-surface-offset: #eeede8;
  --color-border: #d4d3cd;
  --color-divider: #e0dfd9;
  --color-text: #1c1c1e;
  --color-text-muted: #6b6b73;
  --color-text-faint: #a0a0a8;
  --color-primary: #0c7a84;
  --color-primary-hover: #0a5e66;
  --color-primary-active: #084850;
  --color-primary-dim: rgba(12, 122, 132, 0.08);
  --color-warning: #a0681a;
  --color-error: #a13544;
  --color-success: #437a22;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #f5f5f0;
    --color-surface: #ffffff;
    --color-surface-2: #fafaf8;
    --color-surface-offset: #eeede8;
    --color-border: #d4d3cd;
    --color-divider: #e0dfd9;
    --color-text: #1c1c1e;
    --color-text-muted: #6b6b73;
    --color-text-faint: #a0a0a8;
    --color-primary: #0c7a84;
    --color-primary-hover: #0a5e66;
    --color-primary-active: #084850;
    --color-primary-dim: rgba(12, 122, 132, 0.08);
    --color-warning: #a0681a;
    --color-error: #a13544;
    --color-success: #437a22;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  }
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.header--hidden { transform: translateY(-100%); }
.header--scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
}

.header-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.header-nav {
  display: flex;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.nav-link:hover { color: var(--color-primary); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-primary-dim);
}

.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text-muted);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: var(--space-4) var(--space-6) var(--space-6);
  gap: var(--space-3);
}

.mobile-nav.open { display: flex; }

.mobile-nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-divider);
}
.mobile-nav-link:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .header-nav { display: none; }
  .mobile-menu-btn { display: flex; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-8);
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
  min-height: 70vh;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  background: var(--color-primary-dim);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
  letter-spacing: 0.02em;
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-cta-row {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.hero-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.hero-meta a {
  color: var(--color-primary);
  text-decoration: none;
}
.hero-meta a:hover {
  text-decoration: underline;
}

.hero-diagram {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-svg {
  width: 100%;
  max-width: 400px;
}

.hero-link {
  stroke: var(--color-border);
  stroke-width: 1.5;
}

.hero-node {
  fill: var(--color-surface-2);
  stroke: var(--color-primary);
  stroke-width: 2;
}

.hero-pulse {
  fill: var(--color-primary);
  opacity: 0.8;
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: var(--space-12);
    padding-bottom: var(--space-8);
  }
  .hero-diagram { display: none; }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-faint);
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: clamp(var(--space-12), 6vw, var(--space-24)) var(--space-6);
}

.section-alt {
  background: var(--color-surface);
}

.section-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.section-header {
  margin-bottom: var(--space-12);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 64ch;
  line-height: 1.65;
}

/* ============================================================
   INSIGHT BANNER
   ============================================================ */
.insight-banner {
  background: var(--color-primary-dim);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6);
}

.insight-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.insight-icon { flex-shrink: 0; margin-top: 2px; }

.insight-text {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.7;
  max-width: 72ch;
}
.insight-text strong {
  color: var(--color-primary);
  font-weight: 600;
}

/* ============================================================
   PATTERN CARDS
   ============================================================ */
.patterns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.pattern-card {
  text-align: left;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}
.pattern-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.pattern-card:active { transform: translateY(0); }

.pattern-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.pattern-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}
.pattern-icon svg { width: 48px; height: 48px; }

.pattern-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.pattern-brief {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.pattern-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-faint);
  background: var(--color-surface-2);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-divider);
}

/* ============================================================
   EXPLORER
   ============================================================ */
.explorer-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-8);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  -webkit-overflow-scrolling: touch;
}

.explorer-tab {
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-interactive);
}
.explorer-tab:hover {
  color: var(--color-text);
  border-color: var(--color-text-faint);
}
.explorer-tab.active {
  color: var(--color-primary);
  background: var(--color-primary-dim);
  border-color: var(--color-primary);
}

.explorer-panel {
  display: none;
  animation: panelFadeIn 0.35s var(--ease-out);
}
.explorer-panel.active { display: block; }

@keyframes panelFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (max-width: 900px) {
  .panel-grid { grid-template-columns: 1fr; }
}

.panel-diagram {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: sticky;
  top: calc(60px + var(--space-4));
}

@media (max-width: 900px) {
  .panel-diagram { position: static; }
}

.diagram-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-6);
}

/* Flow diagram nodes */
.flow-diagram {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-4);
  align-items: center;
  justify-items: center;
  min-height: 200px;
}

.flow-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.flow-node-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface-2);
  border: 2px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.flow-node-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.3;
}
.flow-node-label small {
  font-size: 0.7rem;
  color: var(--color-text-faint);
}

.flow-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}
.flow-arrow svg { width: 80px; height: 24px; }
.flow-arrow-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-faint);
}

.flow-artifact, .flow-payload {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-dim);
  border: 1px dashed var(--color-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  justify-self: center;
}
.flow-artifact svg { flex-shrink: 0; color: var(--color-primary); }

.flow-payload code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.flow-shared-thread {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary-dim);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  justify-self: center;
}
.flow-shared-thread svg { color: var(--color-primary); }

.flow-swarm-arrows {
  grid-column: 1 / -1;
  justify-self: center;
}
.swarm-svg { width: 200px; height: 80px; }

/* Protocol diagram */
.flow-diagram-protocol {
  display: flex;
  gap: var(--space-4);
  align-items: stretch;
  min-height: 220px;
}

.protocol-side {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.protocol-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
}

.protocol-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.protocol-item {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
}

.protocol-middle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-2);
}

.protocol-wire {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-3);
  border-left: 2px solid var(--color-primary);
  border-right: 2px solid var(--color-primary);
}

.protocol-wire span {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-primary);
  white-space: nowrap;
}

/* ============================================================
   PANEL DETAILS
   ============================================================ */
.panel-details h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.panel-details > p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.detail-block {
  margin-bottom: var(--space-8);
}

.detail-block h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.impl-card {
  padding: var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

.impl-name {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.impl-name a {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  font-size: var(--text-sm);
}
.impl-name a:hover { text-decoration: underline; }

.impl-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-faint);
}

.impl-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.impl-card code {
  font-family: var(--font-mono);
  font-size: 0.8em;
  color: var(--color-primary);
  background: var(--color-primary-dim);
  padding: 1px 4px;
  border-radius: 3px;
}

.artifact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.artifact-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.artifact-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}

.guidance-block {
  padding: var(--space-4);
  background: var(--color-primary-dim);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}

.warning-block {
  background: rgba(212, 148, 60, 0.08);
  border-left-color: var(--color-warning);
}
.warning-block h4 { color: var(--color-warning); }

.guidance-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.guidance-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.6;
}

.guidance-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

.warning-block .guidance-list li::before {
  background: var(--color-warning);
}

.feature-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-primary);
  background: var(--color-primary-dim);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.2);
}

.code-block {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  padding: var(--space-4);
}

.code-block pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.code-block code {
  font-family: inherit;
}

/* ============================================================
   COMPARISON TABLE
   ============================================================ */
.comparison-table-wrap {
  overflow-x: auto;
  margin-bottom: var(--space-12);
  -webkit-overflow-scrolling: touch;
}

.comparison-table {
  min-width: 600px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.comparison-table thead {
  background: var(--color-surface-2);
}

.comparison-table th {
  padding: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: left;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.table-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--color-text-faint);
  margin-top: 2px;
}

.col-mcp { color: var(--color-primary); }
.col-a2a { color: var(--color-warning); }

.comparison-table td {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-divider);
  vertical-align: top;
  line-height: 1.5;
}

.comparison-table tr:last-child td { border-bottom: none; }

.comparison-table td:first-child {
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

/* ============================================================
   LAYER DIAGRAM
   ============================================================ */
.layer-diagram {
  max-width: 700px;
  margin: 0 auto;
}

.layer-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-align: center;
  margin-bottom: var(--space-6);
}

.layers {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.layer {
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-lg);
  text-align: center;
}

.layer-a2a {
  background: rgba(212, 148, 60, 0.1);
  border: 1px solid rgba(212, 148, 60, 0.3);
}
.layer-orchestration {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.layer-mcp {
  background: var(--color-primary-dim);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.25);
}

.layer-label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.layer-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   SPECTRUM
   ============================================================ */
.spectrum-container {
  max-width: 800px;
  margin: 0 auto;
}

.spectrum-track {
  position: relative;
  padding: var(--space-8) 0 var(--space-12);
}

.spectrum-fill {
  position: absolute;
  top: calc(var(--space-8) + 10px);
  left: 0;
  height: 4px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width 0.3s var(--ease-out);
  pointer-events: none;
}

.spectrum-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  outline: none;
  position: relative;
  z-index: 2;
}

.spectrum-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 0 0 4px var(--color-primary-dim);
  transition: box-shadow var(--transition-interactive);
}
.spectrum-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 6px var(--color-primary-dim);
}
.spectrum-slider::-webkit-slider-thumb:active { cursor: grabbing; }

.spectrum-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border-radius: 50%;
  border: none;
  cursor: grab;
}

.spectrum-stops {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-3);
}

.spectrum-stop {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-faint);
  text-align: center;
  flex: 1;
  transition: color var(--transition-interactive);
}
.spectrum-stop.active { color: var(--color-primary); font-weight: 600; }

.spectrum-card {
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: var(--space-6);
  animation: panelFadeIn 0.3s var(--ease-out);
}

.spectrum-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.spectrum-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.spectrum-props {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.prop {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.prop-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.prop-value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.prop-high { color: var(--color-primary); }
.prop-mid { color: var(--color-warning); }
.prop-low { color: var(--color-text-muted); }

/* ============================================================
   WHAT WORKS
   ============================================================ */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.works-card {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.works-icon {
  margin-bottom: var(--space-3);
  color: var(--color-primary);
}

.works-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.works-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.key-insight {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.key-insight blockquote {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
  font-style: italic;
  margin-bottom: var(--space-4);
}

.key-insight cite {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: normal;
}
.key-insight cite a {
  color: var(--color-primary);
  text-decoration: none;
}
.key-insight cite a:hover { text-decoration: underline; }

/* ============================================================
   DECISION WIZARD
   ============================================================ */
.decision-wizard {
  max-width: 700px;
  margin: 0 auto;
}

.wizard-step {
  display: none;
  animation: panelFadeIn 0.35s var(--ease-out);
}
.wizard-step.active { display: block; }

.wizard-question {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.wizard-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.wizard-btn {
  text-align: left;
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition-interactive),
              background var(--transition-interactive),
              transform var(--transition-interactive);
}
.wizard-btn:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
  transform: translateX(4px);
}
.wizard-btn:active { transform: translateX(2px); }

.wizard-result {
  padding: var(--space-8);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.result-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-4);
  background: var(--color-primary-dim);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.result-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.result-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 52ch;
  margin: 0 auto var(--space-8);
}

.result-desc strong {
  color: var(--color-primary);
}

.wizard-restart {
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.wizard-restart:hover {
  color: var(--color-text);
  border-color: var(--color-text-faint);
}

/* ============================================================
   TIERS
   ============================================================ */
.tiers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .tiers-grid { grid-template-columns: 1fr; }
}

.tier-card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.tier-highlight {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
}

.tier-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-dim);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

.tier-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.tier-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.tier-tools {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-faint);
  line-height: 1.5;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-10) var(--space-6);
}

.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.footer-main {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.footer-sub {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.6;
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
}
.footer a:hover { text-decoration: underline; }

/* ============================================================
   SCROLL ANIMATIONS (CSS-only)
   ============================================================ */
.fade-in { opacity: 1; }

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: revealFade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes revealFade {
  to { opacity: 1; }
}