/* ==========================================
   Thomas Peng — Brand Identity Gallery
   styles.css
   OKLCH colors throughout. No gradient text.
   No glassmorphism. No default AI aesthetics.
========================================== */

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

:root {
  /* Gallery chrome — intentionally neutral, warm grey */
  --chrome-bg:       oklch(0.97 0.003 80);
  --chrome-surface:  oklch(0.93 0.004 80);
  --chrome-border:   oklch(0.85 0.006 80);
  --chrome-ink:      oklch(0.22 0.01 80);
  --chrome-muted:    oklch(0.52 0.008 80);
  --chrome-rule:     oklch(0.82 0.005 80);

  /* Spacing scale */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;

  /* Type scale */
  --fs-xs:   11px;
  --fs-sm:   13px;
  --fs-base: 15px;
  --fs-md:   18px;
  --fs-lg:   22px;
  --fs-xl:   32px;
  --fs-2xl:  48px;
  --fs-3xl:  64px;

  /* Radius */
  --r-sm: 3px;
  --r-md: 6px;
  --r-lg: 12px;

  /* Transition */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --dur: 200ms;
}

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

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

body {
  font-family: 'General Sans', 'Switzer', system-ui, -apple-system, sans-serif;
  background: var(--chrome-bg);
  color: var(--chrome-ink);
  line-height: 1.6;
  font-size: var(--fs-base);
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: 'JetBrains Mono', ui-monospace, 'Courier New', monospace;
  font-size: 0.85em;
  letter-spacing: 0.03em;
}

/* ---- Layout ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

@media (max-width: 600px) {
  .container { padding: 0 var(--sp-4); }
}

/* ---- Page header ---- */
.page-header {
  border-bottom: 1px solid var(--chrome-border);
  padding: var(--sp-9) 0 var(--sp-8);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  color: var(--chrome-muted);
  font-size: var(--fs-xs);
}

.header-label { color: var(--chrome-muted); }
.header-sep   { color: var(--chrome-rule); }

.page-title {
  font-family: 'General Sans', system-ui, sans-serif;
  font-size: clamp(var(--fs-2xl), 6vw, var(--fs-3xl));
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--chrome-ink);
  line-height: 1.05;
  margin-bottom: var(--sp-5);
}

.page-positioning {
  font-size: var(--fs-md);
  color: var(--chrome-ink);
  max-width: 60ch;
  line-height: 1.5;
  margin-bottom: var(--sp-4);
}

.page-subtext {
  font-size: var(--fs-sm);
  color: var(--chrome-muted);
  max-width: 56ch;
}

/* ---- System nav ---- */
.system-nav {
  border-bottom: 1px solid var(--chrome-border);
  position: sticky;
  top: 0;
  background: var(--chrome-bg);
  z-index: 100;
}

.system-nav .container {
  display: flex;
  gap: 0;
}

.sys-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-6) var(--sp-4) 0;
  text-decoration: none;
  color: var(--chrome-muted);
  font-size: var(--fs-sm);
  border-right: 1px solid var(--chrome-border);
  margin-right: var(--sp-6);
  transition: color var(--dur) var(--ease);
}

.sys-link:last-child {
  border-right: none;
  margin-right: 0;
}

.sys-link:hover,
.sys-link:focus-visible {
  color: var(--chrome-ink);
  outline: none;
}

.sys-link:focus-visible {
  outline: 2px solid var(--chrome-ink);
  outline-offset: 2px;
}

.sys-num { color: var(--chrome-rule); }
.sys-name { font-weight: 500; }

@media (max-width: 480px) {
  .sys-link { font-size: var(--fs-xs); gap: var(--sp-2); }
  .sys-name { display: none; }
}

/* ---- System section shells ---- */
.system-section {
  padding: var(--sp-9) 0;
  border-bottom: 1px solid var(--chrome-border);
}

/* ---- System header ---- */
.system-header {
  margin-bottom: var(--sp-8);
}

.system-index {
  color: var(--chrome-rule);
  font-size: var(--fs-xs);
  margin-bottom: var(--sp-3);
}

.system-title {
  font-size: clamp(var(--fs-xl), 4vw, var(--fs-2xl));
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin-bottom: var(--sp-4);
}

.system--instrument .system-title { font-family: 'General Sans', system-ui, sans-serif; }
.system--field      .system-title { font-family: 'Clash Display', 'General Sans', system-ui, sans-serif; }
.system--monograph  .system-title { font-family: 'Sentient', Georgia, serif; font-weight: 700; }

.system-pov {
  font-style: italic;
  color: var(--chrome-muted);
  font-size: var(--fs-md);
  margin-bottom: var(--sp-4);
  max-width: 56ch;
}

.system--monograph .system-pov { font-family: 'Sentient', Georgia, serif; }

.system-desc {
  font-size: var(--fs-base);
  color: var(--chrome-muted);
  max-width: 60ch;
  line-height: 1.65;
}

/* ---- Palette ---- */
.palette-row {
  margin-bottom: var(--sp-7);
}

.swatch-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.swatch {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
  width: 96px;
  height: 64px;
  padding: var(--sp-2);
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  position: relative;
}

.swatch:not(.swatch--dark):not(.swatch--mid) {
  border-color: var(--chrome-border);
}

.swatch-label,
.swatch-value {
  display: block;
  font-size: 9px;
  line-height: 1.2;
}

.swatch:not(.swatch--dark) .swatch-label,
.swatch:not(.swatch--dark) .swatch-value { color: oklch(0.30 0.01 80); }

.swatch--dark .swatch-label,
.swatch--dark .swatch-value,
.swatch--mid .swatch-label,
.swatch--mid .swatch-value { color: oklch(0.92 0.005 80); }

@media (max-width: 480px) {
  .swatch { width: 72px; height: 52px; }
}

/* ---- Type pairing ---- */
.type-pairing {
  display: flex;
  gap: var(--sp-7);
  flex-wrap: wrap;
  margin-bottom: var(--sp-7);
  padding: var(--sp-5) 0;
  border-top: 1px solid var(--chrome-border);
  border-bottom: 1px solid var(--chrome-border);
}

.type-pair-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.type-role {
  color: var(--chrome-muted);
  font-size: var(--fs-xs);
  display: block;
}

.type-name {
  display: block;
  font-size: var(--fs-xl);
  line-height: 1;
}

/* Instrument */
.instr-display { font-family: 'General Sans', system-ui, sans-serif; font-weight: 600; color: oklch(0.24 0.012 255); }
.instr-mono    { font-family: 'JetBrains Mono', monospace; font-weight: 400; color: oklch(0.24 0.012 255); font-size: 24px; }

/* Field */
.field-display { font-family: 'Clash Display', 'General Sans', sans-serif; font-weight: 700; color: oklch(0.165 0.018 280); }
.field-body    { font-family: 'Switzer', system-ui, sans-serif; font-weight: 400; color: oklch(0.165 0.018 280); }
.field-mono    { font-family: 'JetBrains Mono', monospace; font-size: 20px; color: oklch(0.165 0.018 280); }

/* Monograph */
.mono-display  { font-family: 'Sentient', Georgia, serif; font-weight: 700; color: oklch(0.26 0.015 60); }
.mono-mono     { font-family: 'JetBrains Mono', monospace; font-size: 18px; color: oklch(0.26 0.015 60); }

/* ---- Marks grid ---- */
.marks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--sp-6);
}

@media (max-width: 480px) {
  .marks-grid { grid-template-columns: 1fr; }
}

/* ---- Mark card ---- */
.mark-card {
  background: oklch(1 0 0);
  border: 1px solid var(--chrome-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--dur) var(--ease);
}

.mark-card:hover,
.mark-card:focus-visible {
  box-shadow: 0 4px 24px oklch(0.22 0.01 80 / 0.08);
  outline: none;
}

.mark-card:focus-visible {
  outline: 2px solid var(--chrome-ink);
  outline-offset: 2px;
}

/* Field cards dark background */
.mark-card--field {
  background: oklch(0.165 0.018 280);
  border-color: oklch(0.28 0.02 280);
}

/* Monograph cards warm paper */
.mark-card--monograph {
  background: oklch(0.965 0.008 85);
  border-color: oklch(0.80 0.01 60);
}

/* ---- Mark previews (light + dark bg panels) ---- */
.mark-previews {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 140px;
  border-bottom: 1px solid var(--chrome-border);
}

.mark-bg {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-5);
}

.mark-bg--light        { background: oklch(0.975 0.004 95); }
.mark-bg--dark         { background: oklch(0.19 0.012 255); }
.mark-bg--field-dark   { background: oklch(0.165 0.018 280); }
.mark-bg--field-light  { background: oklch(0.96 0.006 280); }
.mark-bg--mono-light   { background: oklch(0.965 0.008 85); }
.mark-bg--mono-dark    { background: oklch(0.22 0.015 60); }

.mark-sizes {
  display: flex;
  align-items: flex-end;
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.mark-sizes--wide {
  flex-direction: column;
  align-items: flex-start;
  gap: var(--sp-3);
}

.mark-img {
  display: block;
  flex-shrink: 0;
}

/* ---- Mockups section ---- */
.mark-mockups {
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  border-bottom: 1px solid var(--chrome-border);
}

/* Favicon mockup */
.favicon-mockup {
  display: inline-flex;
}

.browser-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px 5px 8px;
  background: oklch(0.88 0.005 80);
  border-radius: 6px 6px 0 0;
  border: 1px solid oklch(0.80 0.005 80);
  border-bottom: none;
  font-size: var(--fs-xs);
  color: oklch(0.35 0.01 80);
  max-width: 160px;
}

.browser-tab--dark {
  background: oklch(0.25 0.015 280);
  border-color: oklch(0.35 0.015 280);
  color: oklch(0.75 0.01 280);
}

.favicon-img {
  display: block;
  image-rendering: pixelated;
}

.tab-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* OG card mockup */
.og-card {
  border-radius: var(--r-md);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  aspect-ratio: 1200 / 630;
  max-height: 100px;
  border: 1px solid var(--chrome-border);
}

.og-card--instrument {
  background: oklch(0.945 0.005 95);
  border-color: oklch(0.88 0.006 95);
}

.og-card--field {
  background: oklch(0.165 0.018 280);
  border-color: oklch(0.28 0.02 280);
}

.og-card--monograph {
  background: oklch(0.935 0.01 85);
  border-color: oklch(0.80 0.01 60);
}

.og-mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.og-mark--wide {
  width: auto;
  height: 32px;
}

.og-text { display: flex; flex-direction: column; gap: 2px; }

.og-name {
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--chrome-ink);
}

.og-text--light .og-name { color: oklch(0.93 0.008 95); }

.og-role {
  font-size: var(--fs-xs);
  color: var(--chrome-muted);
}

.og-text--light .og-role { color: oklch(0.66 0.015 280); }

/* In-context lockup */
.lockup {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid var(--chrome-border);
}

.lockup--instrument { background: oklch(0.975 0.004 95); border-color: oklch(0.88 0.006 95); }
.lockup--field      { background: oklch(0.165 0.018 280); border-color: oklch(0.28 0.02 280); }
.lockup--monograph  { background: oklch(0.965 0.008 85); border-color: oklch(0.80 0.01 60); flex-direction: column; align-items: flex-start; }

.lockup-mark { display: block; flex-shrink: 0; }
.lockup-mark--wide { width: auto; height: 32px; }

.lockup-text { display: flex; flex-direction: column; gap: 1px; }
.lockup-text--light .lockup-name { color: oklch(0.93 0.008 95); }
.lockup-text--light .lockup-role { color: oklch(0.66 0.015 280); }
.lockup-text--mono  .lockup-name { font-family: 'Sentient', Georgia, serif; }
.lockup-text--mono  .lockup-role { color: oklch(0.48 0.012 60); }

.lockup-name {
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.2;
  color: var(--chrome-ink);
}

.lockup-role {
  font-size: var(--fs-xs);
  color: var(--chrome-muted);
}

/* ---- Mark meta ---- */
.mark-meta {
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  flex: 1;
}

.mark-meta--field    { background: oklch(0.165 0.018 280); }
.mark-meta--monograph { background: oklch(0.965 0.008 85); }

.mark-filename {
  font-size: var(--fs-xs);
  color: var(--chrome-muted);
}

.mark-meta--field .mark-filename { color: oklch(0.66 0.015 280); }
.mark-meta--monograph .mark-filename { color: oklch(0.48 0.012 60); }

.mark-rationale {
  font-size: var(--fs-sm);
  line-height: 1.55;
  color: var(--chrome-muted);
  flex: 1;
}

.mark-meta--field .mark-rationale { color: oklch(0.75 0.01 280); }
.mark-meta--monograph .mark-rationale { color: oklch(0.48 0.012 60); }

.mark-score {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--chrome-rule);
}

.mark-meta--field .mark-score     { border-top-color: oklch(0.28 0.02 280); }
.mark-meta--monograph .mark-score { border-top-color: oklch(0.80 0.01 60); }

.score-label {
  font-size: var(--fs-xs);
  color: var(--chrome-muted);
}

.mark-meta--field .score-label     { color: oklch(0.66 0.015 280); }
.mark-meta--monograph .score-label { color: oklch(0.48 0.012 60); }

.score-value {
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--chrome-ink);
  font-family: 'General Sans', system-ui, sans-serif;
}

.mark-meta--field .score-value     { color: oklch(0.95 0.01 90); }
.mark-meta--monograph .score-value { color: oklch(0.26 0.015 60); }

/* ---- System-specific section backgrounds ---- */
.system--instrument { background: var(--chrome-bg); }
.system--field      { background: oklch(0.165 0.018 280); }
.system--monograph  { background: oklch(0.965 0.008 85); }

.system--field .system-title,
.system--field .system-pov,
.system--field .system-desc,
.system--field .system-index { color: oklch(0.93 0.008 95); }

.system--field .system-pov  { color: oklch(0.66 0.015 280); }
.system--field .system-desc { color: oklch(0.66 0.015 280); }
.system--field .system-index { color: oklch(0.45 0.015 280); }

.system--field .palette-row,
.system--field .type-pairing {
  border-color: oklch(0.28 0.02 280);
}

.system--field .type-role { color: oklch(0.66 0.015 280); }

.system--monograph .system-title { color: oklch(0.26 0.015 60); }
.system--monograph .system-pov   { color: oklch(0.48 0.012 60); }
.system--monograph .system-desc  { color: oklch(0.48 0.012 60); }
.system--monograph .system-index { color: oklch(0.65 0.008 60); }

.system--monograph .palette-row,
.system--monograph .type-pairing {
  border-color: oklch(0.80 0.01 60);
}

.system--monograph .type-role { color: oklch(0.48 0.012 60); }

.system--field .mark-previews   { border-color: oklch(0.28 0.02 280); }
.system--monograph .mark-previews { border-color: oklch(0.80 0.01 60); }

/* System nav active states */
.system--field .sys-link { color: oklch(0.75 0.01 280); }

/* ---- Footer ---- */
.page-footer {
  padding: var(--sp-6) 0;
  border-top: 1px solid var(--chrome-border);
  background: var(--chrome-bg);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
}

.footer-name {
  font-weight: 600;
  color: var(--chrome-ink);
}

.footer-sep  { color: var(--chrome-rule); }
.footer-note { color: var(--chrome-muted); font-size: var(--fs-xs); }

.footer-link {
  color: var(--chrome-muted);
  font-size: var(--fs-xs);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--chrome-ink);
  outline: none;
}

.footer-link:focus-visible {
  outline: 2px solid var(--chrome-ink);
  outline-offset: 2px;
}

/* ---- Keyboard focus visible for all interactive elements ---- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid oklch(0.40 0.10 255);
  outline-offset: 3px;
}

/* ---- Mobile refinements ---- */
@media (max-width: 390px) {
  .mark-previews { grid-template-columns: 1fr; }
  .mark-sizes { gap: var(--sp-3); }
  .og-card { max-height: 80px; padding: var(--sp-4); gap: var(--sp-3); }
  .og-mark { width: 28px; height: 28px; }
  .page-title { font-size: 36px; }
  .type-name { font-size: 24px; }
}

@media (max-width: 600px) {
  .type-pairing { gap: var(--sp-5); }
  .system-section { padding: var(--sp-7) 0; }
}