/* ===================== DESIGN TOKENS ===================== */
:root,
[data-theme='light'] {
  /* Surfaces — cool lab-white */
  --color-bg: #f3f6f7;
  --color-surface: #ffffff;
  --color-surface-2: #fbfdfd;
  --color-surface-offset: #e9eff0;
  --color-surface-offset-2: #dfe7e8;
  --color-divider: #dde5e6;
  --color-border: #cdd8da;

  /* Text */
  --color-text: #101c20;
  --color-text-muted: #5b6d71;
  --color-text-faint: #94a5a8;
  --color-text-inverse: #f4f7f8;

  /* Primary accent — SBR Labs red */
  --color-primary: #df0716;
  --color-primary-hover: #b90512;
  --color-primary-active: #8f040e;
  --color-primary-highlight: #fbdcdf;

  /* Warning / caution — amber-brown */
  --color-warning: #a9631e;
  --color-warning-hover: #8a4f17;
  --color-warning-active: #6b3d12;
  --color-warning-highlight: #efddc5;

  /* Error */
  --color-error: #b23a48;
  --color-error-highlight: #ecd6da;

  /* Category accent hues (data-viz, restrained use) */
  --color-success: #3f7a52;
  --color-success-highlight: #d7e5da;
  --color-blue: #2e6ca4;
  --color-blue-highlight: #d3e0ea;
  --color-purple: #6a4c93;
  --color-purple-highlight: #e1d9ec;
  --color-gold: #b3841a;
  --color-gold-highlight: #ecdfc2;
  --color-notification: #a63b57;
  --color-notification-highlight: #ecd6dd;
  --color-orange: #c0651f;
  --color-orange-highlight: #eeddc8;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 195 / 0.06);
  --shadow-md: 0 4px 14px oklch(0.2 0.02 195 / 0.08);
  --shadow-lg: 0 16px 36px oklch(0.2 0.02 195 / 0.14);

  --content-narrow: 640px;
  --content-default: 980px;
  --content-wide: 1220px;

  --font-display: 'Cabinet Grotesk', 'General Sans', 'Segoe UI', sans-serif;
  --font-body: 'Satoshi', 'General Sans', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', monospace;
}

[data-theme='dark'] {
  --color-bg: #0c1416;
  --color-surface: #111b1d;
  --color-surface-2: #142022;
  --color-surface-offset: #172426;
  --color-surface-offset-2: #1c2b2d;
  --color-divider: #223234;
  --color-border: #2b3d3f;

  --color-text: #d6e0e1;
  --color-text-muted: #849396;
  --color-text-faint: #566869;
  --color-text-inverse: #101c20;

  --color-primary: #ff4d5a;
  --color-primary-hover: #ff7580;
  --color-primary-active: #ff9aa3;
  --color-primary-highlight: #3a1216;

  --color-warning: #d99a52;
  --color-warning-hover: #e3ac6e;
  --color-warning-active: #ecbe8b;
  --color-warning-highlight: #3a2f22;

  --color-error: #d97e88;
  --color-error-highlight: #3a2429;

  --color-success: #74ad82;
  --color-success-highlight: #223326;
  --color-blue: #6fa2cf;
  --color-blue-highlight: #1f2c38;
  --color-purple: #a488c9;
  --color-purple-highlight: #2a2436;
  --color-gold: #d3ab53;
  --color-gold-highlight: #362d1e;
  --color-notification: #cf7c93;
  --color-notification-highlight: #35242a;
  --color-orange: #d68c53;
  --color-orange-highlight: #362a1e;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 14px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 16px 36px oklch(0 0 0 / 0.5);
}

/* Type scale */
:root {
  --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, 3.25rem);
  --text-hero: clamp(2.5rem, 1rem + 4.5vw, 4.5rem);

  --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;
  --space-32: 8rem;
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, svg { display: block; max-width: 100%; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li { text-wrap: pretty; }

a { color: inherit; text-decoration: none; }

::selection { background: oklch(from var(--color-primary) l c h / 0.25); }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }

a, button, [role='button'], input, select {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

/* ===================== LAYOUT ===================== */
.wrap {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: var(--space-6);
}
.wrap--narrow { max-width: var(--content-default); }

section { padding-block: clamp(var(--space-12), 6vw, var(--space-20)); }

/* ===================== HEADER ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: var(--space-6);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  flex-shrink: 0;
}
.brand svg { width: 30px; height: 30px; color: var(--color-primary); flex-shrink: 0; }
.brand-logo { height: 32px; width: auto; display: block; }
.brand-logo--dark { display: none; }
[data-theme='dark'] .brand-logo--light { display: none; }
[data-theme='dark'] .brand-logo--dark { display: block; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-3);
  margin-left: var(--space-1);
}
.nav-shop-link {
  color: var(--color-primary) !important;
  font-weight: 700 !important;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-1);
  position: relative;
}
.main-nav a:hover { color: var(--color-text); }
.main-nav a[aria-current='page'] { color: var(--color-primary); }
.main-nav a[aria-current='page']::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.header-actions { display: flex; align-items: center; gap: var(--space-3); }

.theme-toggle {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text-faint); }
.theme-toggle svg { width: 17px; height: 17px; }

.nav-toggle {
  display: none;
  width: 38px; height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  place-items: center;
}
.nav-toggle svg { width: 18px; height: 18px; }

@media (max-width: 780px) {
  .main-nav {
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-6);
    gap: var(--space-3);
    display: none;
    box-shadow: var(--shadow-md);
  }
  .main-nav.is-open { display: flex; }
  .nav-toggle { display: grid; }
}

/* ===================== BUTTONS ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
}
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--ghost { border: 1px solid var(--color-border); color: var(--color-text); }
.btn--ghost:hover { border-color: var(--color-text-faint); background: var(--color-surface-offset); }

/* ===================== HERO ===================== */
.hero {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32)) clamp(var(--space-12), 6vw, var(--space-20));
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-16);
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}
.hero h1 {
  font-size: var(--text-hero);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
}
.hero p.lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: var(--space-8);
}
.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }

.hero-visual {
  position: relative;
  aspect-ratio: 1/1;
  display: grid;
  place-items: center;
}
.chain-art { width: 100%; max-width: 380px; color: var(--color-primary); }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 260px; margin: 0 auto; }
}

/* ===================== DISCLAIMER BANNER ===================== */
.disclaimer-bar {
  background: var(--color-warning-highlight);
  border-bottom: 1px solid var(--color-border);
}
.disclaimer-bar .wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-warning-active);
}
.disclaimer-bar svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ===================== CATEGORY GRID ===================== */
.section-head { margin-bottom: var(--space-10); max-width: 60ch; }
.section-head .kicker {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  display: block;
}
.section-head h2 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
.section-head p { color: var(--color-text-muted); font-size: var(--text-base); }

.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}
.cat-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--color-text-faint); }
.cat-dot { display: block; width: 12px; height: 12px; border-radius: var(--radius-full); margin-bottom: var(--space-4); }
.cat-card h3 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.cat-card p { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-4); }
.cat-count { font-size: var(--text-xs); color: var(--color-text-faint); font-family: var(--font-mono); }

/* ===================== HOW IT WORKS ===================== */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.step-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.step h3 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.step p { color: var(--color-text-muted); font-size: var(--text-sm); }
@media (max-width: 780px) { .steps { grid-template-columns: 1fr; } }

/* ===================== LIBRARY PAGE ===================== */
.library-toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.search-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-5);
}
.search-row svg { width: 18px; height: 18px; color: var(--color-text-faint); flex-shrink: 0; }
.search-row input {
  border: none;
  background: transparent;
  width: 100%;
  min-width: 0;
  font-size: var(--text-base);
  padding-block: var(--space-2);
  text-overflow: ellipsis;
}
.search-row input:focus { outline: none; }
.result-count { font-size: var(--text-xs); color: var(--color-text-faint); font-family: var(--font-mono); flex-shrink: 0; }

.chip-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.chip {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface);
}
.chip:hover { border-color: var(--color-text-faint); color: var(--color-text); }
.chip.is-active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

.pep-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: var(--space-5);
}
.pep-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  width: 100%;
}
.pep-card:hover { border-color: var(--color-text-faint); box-shadow: var(--shadow-sm); }
.pep-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}
.pep-card h3 { font-size: var(--text-lg); margin-bottom: var(--space-1); }
.pep-alias { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); margin-bottom: var(--space-3); }
.pep-card .pep-blurb { font-size: var(--text-sm); color: var(--color-text-muted); line-clamp: 2; }

.empty-state { text-align: center; padding-block: var(--space-16); color: var(--color-text-muted); }
.empty-state svg { width: 44px; height: 44px; margin: 0 auto var(--space-4); color: var(--color-text-faint); }

/* ===================== DETAIL DIALOG ===================== */
dialog#pep-detail {
  position: fixed;
  inset: 0;
  margin: auto;
  border: none;
  border-radius: var(--radius-xl);
  padding: 0;
  width: min(680px, 92vw);
  max-height: 86vh;
  height: fit-content;
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-lg);
}
dialog#pep-detail::backdrop { background: oklch(0.1 0 0 / 0.55); backdrop-filter: blur(2px); }
.detail-scroll { max-height: 86vh; overflow-y: auto; padding: var(--space-8); }
.detail-close {
  position: sticky;
  float: right;
  top: 0;
  width: 34px; height: 34px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  display: grid; place-items: center;
  background: var(--color-surface);
}
.detail-close svg { width: 15px; height: 15px; }
.detail-header { margin-bottom: var(--space-6); }
.detail-header .pep-tag { margin-bottom: var(--space-4); }
.detail-header h2 { font-size: var(--text-xl); margin-bottom: var(--space-2); }
.detail-alias { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-text-faint); margin-bottom: var(--space-1); }
.detail-structure { font-size: var(--text-sm); color: var(--color-text-muted); }

.detail-block { margin-bottom: var(--space-6); }
.detail-block h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.detail-block p { font-size: var(--text-base); }
.fact-list { display: flex; flex-direction: column; gap: var(--space-2); }
.fact-list li { font-size: var(--text-sm); padding-left: var(--space-5); position: relative; }
.fact-list li::before {
  content: '';
  position: absolute; left: 0; top: 0.55em;
  width: 6px; height: 6px; border-radius: var(--radius-full);
  background: var(--color-primary);
}
.status-pill {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-md);
}
.source-list { display: flex; flex-direction: column; gap: var(--space-2); }
.source-list a { font-size: var(--text-sm); color: var(--color-primary); text-decoration: underline; text-decoration-color: var(--color-primary-highlight); }
.source-list a:hover { color: var(--color-primary-hover); }

/* ===================== GLOSSARY ===================== */
.glossary-list { display: flex; flex-direction: column; }
.glossary-item {
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-6);
}
.glossary-item dt { font-family: var(--font-mono); font-weight: 600; font-size: var(--text-base); color: var(--color-primary); }
.glossary-item dd { color: var(--color-text-muted); font-size: var(--text-base); }
@media (max-width: 700px) {
  .glossary-item { grid-template-columns: 1fr; gap: var(--space-2); }
}

/* ===================== SAFETY PAGE ===================== */
.safety-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.safety-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.safety-card svg { width: 26px; height: 26px; color: var(--color-primary); margin-bottom: var(--space-4); }
.safety-card h3 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.safety-card p { color: var(--color-text-muted); font-size: var(--text-sm); }
@media (max-width: 780px) { .safety-grid { grid-template-columns: 1fr; } }

.callout {
  background: var(--color-warning-highlight);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-4);
}
.callout svg { width: 24px; height: 24px; color: var(--color-warning-active); flex-shrink: 0; }
.callout h3 { font-size: var(--text-base); color: var(--color-warning-active); margin-bottom: var(--space-2); }
.callout p { font-size: var(--text-sm); color: var(--color-warning-active); }

/* ===================== FOOTER ===================== */
.site-footer { border-top: 1px solid var(--color-divider); padding-block: var(--space-12); margin-top: var(--space-16); }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--space-8); flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-display); font-weight: 700; margin-bottom: var(--space-3); }
.footer-brand svg { width: 20px; height: 20px; color: var(--color-primary); }
.footer-brand .brand-logo { height: 24px; }
.footer-tagline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-top: var(--space-2);
  margin-bottom: var(--space-4);
}
.footer-shop-link {
  display: inline-flex;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-primary);
  padding-bottom: 2px;
  margin-bottom: var(--space-4);
}
.footer-shop-link:hover { color: var(--color-primary); }
.footer-disclaimer { font-size: var(--text-xs); color: var(--color-text-faint); max-width: 46ch; line-height: 1.6; }
.footer-links { display: flex; gap: var(--space-6); }
.footer-links a { font-size: var(--text-sm); color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-text); }
.footer-bottom { margin-top: var(--space-8); padding-top: var(--space-6); border-top: 1px solid var(--color-divider); font-size: var(--text-xs); color: var(--color-text-faint); }

/* ===================== PAGE HEADERS (interior pages) ===================== */
.page-head { padding-block: clamp(var(--space-12), 6vw, var(--space-16)) var(--space-8); }
.page-head h1 { font-size: var(--text-2xl); margin-bottom: var(--space-3); }
.page-head p { color: var(--color-text-muted); font-size: var(--text-base); max-width: 60ch; }

/* Utility */
.text-muted { color: var(--color-text-muted); }
.mono { font-family: var(--font-mono); }