/* =========================================================
   Shade of Design — System Tokens
   ========================================================= */

:root {
  /* Core palette */
  --ocean: #1A3E62;
  --ocean-700: #14304D;
  --ocean-900: #0B1F33;
  --slate: #5D809D;
  --slate-300: #93AABF;
  --ember: #C97B4A;
  --ember-soft: #E4A57E;

  /* Surfaces (light) */
  --bg: #F3F4F6;
  --paper: #FAFAF7;
  --surface: #FFFFFF;
  --ink: #0B1726;
  --ink-soft: #324155;
  --muted: #6B7785;
  --border: #DCE2EA;
  --border-soft: #E8ECF1;

  /* Status */
  --positive: #2F7D5B;
  --warn:     #C9913C;
  --danger:   #B0463A;

  /* Spacing scale (8pt with 4 half-step) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 20px;
  --s-6: 24px;
  --s-8: 32px;
  --s-10: 40px;
  --s-12: 48px;
  --s-16: 64px;
  --s-20: 80px;

  /* Radius */
  --r-1: 4px;
  --r-2: 8px;
  --r-3: 12px;
  --r-4: 16px;
  --r-pill: 999px;

  /* Type */
  --font-sans: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* Shadows */
  --shadow-1: 0 1px 2px rgba(11,23,38,0.06), 0 1px 1px rgba(11,23,38,0.04);
  --shadow-2: 0 4px 16px rgba(11,23,38,0.08), 0 1px 2px rgba(11,23,38,0.04);
  --shadow-3: 0 24px 60px -20px rgba(11,23,38,0.25), 0 8px 24px -8px rgba(11,23,38,0.1);
}

[data-theme="dark"] {
  --bg: #0B1726;
  --paper: #0F1D30;
  --surface: #142841;
  --ink: #F3F4F6;
  --ink-soft: #C7D0DC;
  --muted: #8593A6;
  --border: rgba(255,255,255,0.10);
  --border-soft: rgba(255,255,255,0.06);
  --ocean: #4A7BAA;
  --ocean-700: #3A6493;
  --shadow-1: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-2: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-3: 0 24px 60px -20px rgba(0,0,0,0.6);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 240ms ease, color 240ms ease;
}

body {
  min-height: 100vh;
}

::selection {
  background: var(--ocean);
  color: #fff;
}

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

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--s-10) var(--s-8) var(--s-20);
}

.shell-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--s-8);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--s-10);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.brand-mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.brand-meta { line-height: 1.15; }
.brand-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ocean);
}
[data-theme="dark"] .brand-name { color: var(--slate-300); }
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}

.doc-meta {
  display: flex;
  gap: var(--s-6);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.doc-meta span b {
  color: var(--ink-soft);
  font-weight: 500;
  margin-left: 6px;
}

/* Tab bar */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--s-10);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 5;
  padding-top: var(--s-2);
}
.tab {
  appearance: none;
  background: transparent;
  border: 0;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--muted);
  padding: var(--s-3) var(--s-4);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 160ms ease, border-color 160ms ease;
  display: flex;
  align-items: center;
  gap: var(--s-2);
}
.tab .tab-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--slate);
  opacity: 0.7;
}
.tab:hover { color: var(--ink); }
.tab.is-active {
  color: var(--ocean);
  border-bottom-color: var(--ocean);
}
[data-theme="dark"] .tab.is-active { color: var(--slate-300); border-bottom-color: var(--slate-300); }

/* Section */
.section { display: grid; gap: var(--s-10); }
.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
  padding-bottom: var(--s-6);
  border-bottom: 1px solid var(--border-soft);
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--ember);
  display: inline-block;
}
.section-title {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0;
  color: var(--ink);
}
.section-lede {
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 64ch;
  margin: 0;
  text-wrap: pretty;
}

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  padding: var(--s-8);
  box-shadow: var(--shadow-1);
}
.card-quiet {
  background: var(--paper);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-3);
  padding: var(--s-6);
}
.card-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 var(--s-4);
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-4); }
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Code chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  background: rgba(26,62,98,0.06);
  color: var(--ocean);
  padding: 4px 8px;
  border-radius: var(--r-1);
  border: 1px solid rgba(26,62,98,0.10);
}
[data-theme="dark"] .chip {
  background: rgba(255,255,255,0.04);
  color: var(--slate-300);
  border-color: rgba(255,255,255,0.08);
}
.chip-warm {
  background: rgba(201,123,74,0.10);
  color: var(--ember);
  border-color: rgba(201,123,74,0.20);
}

/* Divider w/ label */
.rule-label {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
  margin: var(--s-8) 0 var(--s-4);
}
.rule-label::after {
  content: "";
  height: 1px;
  background: var(--border-soft);
}

/* Buttons (system) */
.btn {
  appearance: none;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: -0.005em;
  border-radius: var(--r-2);
  padding: 10px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease, transform 80ms ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--ocean);
  color: #fff;
}
.btn-primary:hover { background: var(--ocean-700); }
.btn-secondary {
  background: transparent;
  color: var(--ocean);
  border-color: var(--ocean);
}
.btn-secondary:hover { background: rgba(26,62,98,0.06); }
[data-theme="dark"] .btn-secondary { color: var(--slate-300); border-color: var(--slate-300); }
.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
}
.btn-ghost:hover { color: var(--ocean); background: rgba(26,62,98,0.04); }
.btn-warm {
  background: var(--ember);
  color: #fff;
}
.btn-warm:hover { background: #B36A3D; }
.btn-sm { padding: 6px 12px; font-size: 12.5px; }
.btn-lg { padding: 14px 22px; font-size: 15px; }

/* Inputs */
.field {
  display: grid;
  gap: 6px;
}
.field label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
}
.input, .textarea, .select {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-2);
  padding: 10px 12px;
  outline: 0;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--ocean);
  box-shadow: 0 0 0 3px rgba(26,62,98,0.12);
}
[data-theme="dark"] .input:focus,
[data-theme="dark"] .textarea:focus,
[data-theme="dark"] .select:focus {
  box-shadow: 0 0 0 3px rgba(93,128,157,0.22);
}
.input::placeholder { color: var(--muted); }
.help { font-size: 12px; color: var(--muted); }

/* ============ Logo plates ============ */
.logo-plate {
  position: relative;
  border-radius: var(--r-3);
  border: 1px solid var(--border-soft);
  display: grid;
  place-items: center;
  padding: var(--s-12) var(--s-8);
  min-height: 220px;
}
.logo-plate img { max-width: 60%; max-height: 160px; display: block; }
.logo-plate .label {
  position: absolute;
  top: 12px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
}
.plate-paper { background: var(--paper); }
.plate-ocean { background: var(--ocean); }
.plate-ocean .label { color: rgba(255,255,255,0.6); }
.plate-ember { background: var(--ember); }
.plate-ember .label { color: rgba(255,255,255,0.7); }

/* Color swatch */
.swatch-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  overflow: hidden;
  display: grid;
  grid-template-rows: 140px auto;
}
.swatch-color {
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: var(--s-4);
}
.swatch-color .role {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.85);
  background: rgba(0,0,0,0.18);
  padding: 4px 8px;
  border-radius: var(--r-1);
}
.swatch-color.light .role { color: var(--ink); background: rgba(0,0,0,0.06); }
.swatch-meta { padding: var(--s-4) var(--s-5) var(--s-5); }
.swatch-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}
.swatch-hex {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
}
.swatch-use {
  font-size: 12.5px;
  color: var(--muted);
  margin: var(--s-3) 0 0;
  line-height: 1.5;
}

/* Type specimen */
.type-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--s-6);
  padding: var(--s-6) 0;
  border-top: 1px solid var(--border-soft);
  align-items: baseline;
}
.type-row:first-of-type { border-top: 0; }
.type-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  display: grid;
  gap: 4px;
  align-content: start;
}
.type-meta b { color: var(--ink-soft); font-weight: 500; }
.type-sample { color: var(--ink); }

/* Voice list */
.vt-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-6); }
@media (max-width: 800px) { .vt-grid { grid-template-columns: 1fr; } }
.vt-card {
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  background: var(--surface);
  padding: var(--s-6);
}
.vt-card h4 {
  font-size: 18px;
  margin: 0 0 var(--s-2);
  letter-spacing: -0.01em;
}
.vt-card .we, .vt-card .not {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  margin-top: var(--s-4);
  margin-bottom: var(--s-2);
}
.vt-card .we { color: var(--positive); }
.vt-card .not { color: var(--danger); }
.vt-card ul {
  margin: 0;
  padding-left: 18px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.55;
}

/* Mission cards */
.mission-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-6); }
@media (max-width: 900px) { .mission-grid { grid-template-columns: 1fr; } }
.mission-card {
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  background: var(--surface);
  padding: var(--s-8);
  display: grid;
  gap: var(--s-4);
  position: relative;
  overflow: hidden;
}
.mission-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-top: 3px solid var(--ocean);
  border-radius: var(--r-3) var(--r-3) 0 0;
}
.mission-card.warm::before { border-top-color: var(--ember); }
.mission-card.slate::before { border-top-color: var(--slate); }
.mission-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
}
.mission-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ember);
}
.mission-card.slate .mission-num { color: var(--slate); }
.mission-card.deep .mission-num { color: var(--ocean); }
.mission-statement {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}
.mission-body {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0;
}
.mission-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  padding: 5px 10px;
  border-radius: var(--r-pill);
  background: rgba(26,62,98,0.06);
  color: var(--ocean);
  border: 1px solid rgba(26,62,98,0.10);
  width: fit-content;
}
.mission-card.warm .mission-pill { background: rgba(201,123,74,0.10); color: var(--ember); border-color: rgba(201,123,74,0.20); }
.mission-card.slate .mission-pill { background: rgba(93,128,157,0.10); color: var(--slate); border-color: rgba(93,128,157,0.20); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--s-10);
  align-items: stretch;
  margin-bottom: var(--s-12);
}
@media (max-width: 980px) { .hero { grid-template-columns: 1fr; } }
.hero-copy {
  display: grid;
  gap: var(--s-6);
  align-content: center;
}
.hero h1 {
  font-size: 64px;
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 0.98;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}
.hero h1 em {
  font-style: normal;
  color: var(--ember);
}
.hero-lede {
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 50ch;
  margin: 0;
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: var(--s-8);
  margin-top: var(--s-4);
}
@media (max-width: 600px) { .hero-meta { grid-template-columns: 1fr 1fr; } }
.hero-meta div {
  display: grid;
  gap: 4px;
}
.hero-meta .k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero-meta .v {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}
.hero-mark {
  background:
    radial-gradient(120% 80% at 80% 10%, rgba(201,123,74,0.10), transparent 60%),
    radial-gradient(80% 60% at 10% 90%, rgba(93,128,157,0.12), transparent 60%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-4);
  display: grid;
  place-items: center;
  padding: var(--s-10);
  min-height: 360px;
  position: relative;
  overflow: hidden;
}
.hero-mark img { width: 60%; max-width: 280px; }
.hero-mark::after {
  content: "SHADE / 01";
  position: absolute;
  bottom: 14px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* Component preview block */
.comp-block {
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  background: var(--surface);
  padding: var(--s-8);
  display: grid;
  gap: var(--s-6);
}
.comp-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.comp-block h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}
.comp-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  align-items: center;
}

/* Voice usage example */
.voice-example {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  border-left: 3px solid var(--ember);
  padding: var(--s-4) var(--s-5);
  border-radius: 0 var(--r-2) var(--r-2) 0;
  margin: var(--s-3) 0 0;
}

/* Footer */
.shell-foot {
  margin-top: var(--s-16);
  padding-top: var(--s-6);
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}