/* ============================================================
   CaseWeb — style.css
   Palette: archival charcoal/paper base, cool "graph" indigo-blue
   accent for connections, warm "evidence" amber for timeline
   markers and citations. Distinct from sibling ProofCore products.
   ============================================================ */

:root,
[data-theme='light'] {
  /* Surfaces — warm paper / case-folder tones */
  --color-bg: #f4f0e8;
  --color-surface: #faf7f0;
  --color-surface-2: #fffdf8;
  --color-surface-offset: #ece6d8;
  --color-surface-offset-2: #e3dcc9;
  --color-surface-dynamic: #d9d0b8;
  --color-divider: #d6cdb5;
  --color-border: #c7bc9d;

  /* Text — near-black ink */
  --color-text: #241f16;
  --color-text-muted: #6b6250;
  --color-text-faint: #a89d81;
  --color-text-inverse: #f4f0e8;

  /* Primary accent — graph indigo (connections, links, CTAs) */
  --color-primary: #3a5a78;
  --color-primary-hover: #2c4560;
  --color-primary-active: #203449;
  --color-primary-highlight: #d3dbe3;

  /* Evidence accent — case-file amber (timeline markers, citations) */
  --color-evidence: #c98a3e;
  --color-evidence-hover: #a86e2c;
  --color-evidence-active: #7f521f;
  --color-evidence-highlight: #ecdcc0;

  /* Warning / Error / Success — kept for form states */
  --color-warning: #964219;
  --color-warning-highlight: #ddcfc6;
  --color-error: #96382c;
  --color-error-highlight: #e0cec7;
  --color-success: #3f6e3a;
  --color-success-highlight: #d3ddcd;

  --radius-sm: 0.3rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.85rem;
  --radius-xl: 1.1rem;
  --radius-full: 9999px;

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

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 80 / 0.08);
  --shadow-md: 0 4px 14px oklch(0.2 0.02 80 / 0.1);
  --shadow-lg: 0 16px 36px oklch(0.2 0.02 80 / 0.16);

  --content-narrow: 640px;
  --content-default: 980px;
  --content-wide: 1220px;
  --content-full: 100%;

  --font-display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --font-body: 'General Sans', 'Segoe UI', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #1c1a15;
  --color-surface: #211f1a;
  --color-surface-2: #262319;
  --color-surface-offset: #26241d;
  --color-surface-offset-2: #2d2a21;
  --color-surface-dynamic: #383424;
  --color-divider: #322f24;
  --color-border: #443f2e;

  --color-text: #ece6d6;
  --color-text-muted: #a49b83;
  --color-text-faint: #6c6551;
  --color-text-inverse: #211f1a;

  --color-primary: #7fa3c4;
  --color-primary-hover: #9bb9d6;
  --color-primary-active: #b3cadf;
  --color-primary-highlight: #2b3946;

  --color-evidence: #dba55c;
  --color-evidence-hover: #e6bb7c;
  --color-evidence-active: #efce9d;
  --color-evidence-highlight: #443a26;

  --color-warning: #d18a56;
  --color-warning-highlight: #453729;
  --color-error: #c96a56;
  --color-error-highlight: #453029;
  --color-success: #8db27f;
  --color-success-highlight: #313d2b;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 14px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 16px 36px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #1c1a15;
    --color-surface: #211f1a;
    --color-surface-2: #262319;
    --color-surface-offset: #26241d;
    --color-surface-offset-2: #2d2a21;
    --color-surface-dynamic: #383424;
    --color-divider: #322f24;
    --color-border: #443f2e;
    --color-text: #ece6d6;
    --color-text-muted: #a49b83;
    --color-text-faint: #6c6551;
    --color-text-inverse: #211f1a;
    --color-primary: #7fa3c4;
    --color-primary-hover: #9bb9d6;
    --color-primary-active: #b3cadf;
    --color-primary-highlight: #2b3946;
    --color-evidence: #dba55c;
    --color-evidence-hover: #e6bb7c;
    --color-evidence-active: #efce9d;
    --color-evidence-highlight: #443a26;
  }
}

: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, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 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;
}

/* ============ Layout primitives ============ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-text);
}

h1 { font-weight: 600; }
h2 { font-size: var(--text-xl); font-weight: 600; margin-bottom: var(--space-4); }
h3 { font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-2); }

p { color: var(--color-text-muted); }

em {
  font-style: italic;
  color: var(--color-evidence);
}

a { color: var(--color-primary); text-decoration: none; }

.section-eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-evidence);
  margin-bottom: var(--space-3);
}

.section-lede {
  font-size: var(--text-base);
  max-width: 640px;
  margin-top: var(--space-2);
}

/* ============ Buttons ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:active { background: var(--color-primary-active); }

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { background: var(--color-surface-offset); }

.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }
.btn-block { width: 100%; }

/* ============ Header ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  flex: 0 0 auto;
}

.brand-mark {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
}

.main-nav ul {
  display: flex;
  gap: var(--space-8);
}

.main-nav a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}
.main-nav a:hover { color: var(--color-text); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 0 0 auto;
}

.theme-toggle,
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}
.theme-toggle:hover,
.nav-toggle:hover { background: var(--color-surface-offset); }

.nav-toggle { display: none; }

#mobile-nav { display: none; }

/* ============ Mobile nav — CSS-only visual state ============ */
@media (max-width: 940px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .header-actions .btn-primary { display: none; }

  #mobile-nav {
    display: none;
    width: 100%;
  }

  #mobile-nav.nav__links--open {
    display: block;
    border-top: 1px solid var(--color-divider);
    background: var(--color-bg);
    padding: var(--space-4) var(--space-6) var(--space-6);
  }

  #mobile-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    width: 100%;
  }

  #mobile-nav a {
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--color-text);
    display: block;
  }
}

/* ============ Hero ============ */

.hero { padding-top: clamp(var(--space-16), 10vw, var(--space-24)); }

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero-copy h1 {
  font-size: var(--text-3xl);
  line-height: 1.05;
  margin-bottom: var(--space-6);
}

.hero-copy .lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: var(--space-8);
}

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

.hero-microcopy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ---- hero visual: case panel mockup ---- */

.hero-visual { min-width: 0; }

.case-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.case-panel__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-divider);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.case-panel__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-evidence);
  flex-shrink: 0;
}

.case-panel__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  padding: var(--space-5);
}

.mini-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.mini-graph svg { width: 100%; height: auto; }

.mini-caption {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-2);
}

.edge { stroke: var(--color-primary); stroke-width: 1.6; opacity: 0.8; }
.edge--dashed { stroke-dasharray: 4 4; }

.node circle {
  fill: var(--color-surface-2);
  stroke: var(--color-primary);
  stroke-width: 1.8;
}
.node text {
  font-family: var(--font-body);
  font-size: 8px;
  font-weight: 700;
  fill: var(--color-primary);
}
.node--org circle { stroke: var(--color-evidence); }
.node--org text { fill: var(--color-evidence); }

.evidence-tag circle {
  fill: var(--color-evidence);
  stroke: var(--color-surface);
  stroke-width: 1.5;
}
.evidence-tag__doc {
  stroke: var(--color-surface);
  stroke-width: 1;
  fill: var(--color-surface);
}

.mini-timeline ol {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-divider);
}

.mini-timeline li {
  position: relative;
  padding-left: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.tl-date {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-faint);
}

.tl-dot {
  position: absolute;
  left: calc(-1 * var(--space-2) - 5px);
  top: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-surface);
}

.mini-timeline li.has-evidence .tl-dot { background: var(--color-evidence); }

.tl-text {
  font-size: var(--text-sm);
  color: var(--color-text);
  overflow-wrap: break-word;
}

.ev-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--color-evidence);
  color: var(--color-surface);
  font-size: 9px;
  font-weight: 700;
  margin-left: var(--space-1);
  flex-shrink: 0;
}

/* ============ How it works ============ */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}

.step-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  min-width: 0;
}

.step-card--engine {
  border-color: var(--color-evidence);
  box-shadow: var(--shadow-md);
}

.step-num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-evidence);
  margin-bottom: var(--space-4);
}

.step-card p { font-size: var(--text-sm); }

/* ============ Demo section ============ */

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}

.demo-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  min-width: 0;
}

.demo-card__desc {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.demo-fragment {
  width: 100%;
  height: auto;
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.tl-line { stroke: var(--color-divider); stroke-width: 2; }
.tl-point { fill: var(--color-primary); }
.tl-point--ev { fill: var(--color-evidence); }

.demo-card__cite {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  border-top: 1px dashed var(--color-divider);
  padding-top: var(--space-3);
  overflow-wrap: break-word;
}
.demo-card__cite span { color: var(--color-evidence); font-weight: 600; }

/* ============ Trust ============ */

.trust-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: var(--space-16);
  align-items: start;
}

.trust-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.trust-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  min-width: 0;
}

.trust-card svg { color: var(--color-evidence); margin-bottom: var(--space-3); }
.trust-card p { font-size: var(--text-sm); }

/* ============ Audience ============ */

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}

.audience-card {
  min-width: 0;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.audience-icon {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.audience-card p { font-size: var(--text-sm); }

/* ============ Waitlist ============ */

.waitlist {
  background: var(--color-surface-offset);
  border-radius: var(--radius-xl);
  margin-inline: var(--space-6);
}

.waitlist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.waitlist-form-wrap { min-width: 0; }

.waitlist-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

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

.form-row label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}

.form-row input,
.form-row select {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-sm);
  width: 100%;
}

.form-row input:focus,
.form-row select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.form-microcopy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
}

.waitlist-confirm {
  background: var(--color-surface-2);
  border: 1px solid var(--color-evidence);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
}
.waitlist-confirm svg { color: var(--color-evidence); margin-inline: auto; margin-bottom: var(--space-4); }
.waitlist-confirm p { font-size: var(--text-sm); }

/* ============ Footer ============ */

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-10);
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
}
.footer-brand .brand-mark { width: 22px; height: 22px; color: var(--color-primary); }
.footer-brand .brand-name { font-size: var(--text-base); }

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}
.footer-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.footer-nav a:hover { color: var(--color-text); }

.footer-legal {
  width: 100%;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-6);
  margin-top: var(--space-2);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-5);
  z-index: 100;
}
.skip-link:focus { left: var(--space-4); top: var(--space-4); }

/* ============ Responsive ============ */

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-10); }
  .case-panel__body { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
  .trust-grid { grid-template-columns: 1fr; }
  .audience-grid { grid-template-columns: 1fr; }
  .waitlist-grid { grid-template-columns: 1fr; }
  .waitlist { margin-inline: var(--space-4); }
}

@media (max-width: 560px) {
  .container { padding-inline: var(--space-4); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .footer-nav ul { gap: var(--space-4); }
}