/* =========================================================
   Thomas Peng · Brand Identity Round 2 · Gallery Styles
   OKLCH color system; no #000/#fff; no em dashes
   ========================================================= */

/* ---- Fonts ---- */
@import url('https://api.fontshare.com/v2/css?f[]=switzer@400,500,600,700&f[]=general-sans@400,500,600&f[]=cabinet-grotesk@400,500,700,800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---- Custom Properties ---- */
:root {
  /* Page chrome */
  --page-bg:        oklch(0.97 0.006 90);
  --page-ink:       oklch(0.22 0.010 80);
  --page-mid:       oklch(0.50 0.010 80);
  --page-faint:     oklch(0.88 0.008 85);
  --page-border:    oklch(0.82 0.010 85);
  --page-white:     oklch(0.99 0.003 90);

  /* Accent per section -- overridden by data-theme */
  --accent:         oklch(0.60 0.12 75);

  /* Spacing rhythm */
  --sp-xs:  0.5rem;
  --sp-sm:  1rem;
  --sp-md:  2rem;
  --sp-lg:  4rem;
  --sp-xl:  7rem;

  /* Typography scale */
  --fs-micro: 0.625rem;
  --fs-sm:    0.75rem;
  --fs-base:  1rem;
  --fs-md:    1.125rem;
  --fs-lg:    1.5rem;
  --fs-xl:    2.25rem;
  --fs-2xl:   3.5rem;

  --font-sans:  'General Sans', 'Switzer', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@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 {
  background-color: var(--page-bg);
  color: var(--page-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---- Skip link ---- */
.skip-link {
  position: fixed;
  top: var(--sp-sm);
  left: var(--sp-sm);
  z-index: 9999;
  background: var(--page-ink);
  color: var(--page-white);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  text-decoration: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
.skip-link:focus {
  opacity: 1;
  pointer-events: auto;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ---- Page Header ---- */
.page-header {
  padding: var(--sp-lg) var(--sp-md) var(--sp-xl);
  max-width: 900px;
  margin: 0 auto;
}

.header-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--sp-md);
}

.header-title {
  font-family: 'Switzer', 'General Sans', sans-serif;
  font-size: clamp(2.5rem, 6vw, var(--fs-2xl));
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--page-ink);
  margin-bottom: var(--sp-sm);
}

.header-sub {
  font-size: var(--fs-md);
  color: var(--page-mid);
  max-width: 60ch;
  margin-bottom: var(--sp-xl);
}

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

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  overflow-x: auto;
  scrollbar-width: none;
  height: 56px;
}
.nav-inner::-webkit-scrollbar { display: none; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--page-mid);
  font-size: var(--fs-sm);
  font-weight: 500;
  white-space: nowrap;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  min-height: 44px;
}
.nav-link:hover, .nav-link:focus-visible {
  color: var(--page-ink);
  border-color: var(--accent);
  outline: none;
}
.nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}
.nav-num {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  opacity: 0.6;
}
.nav-label { font-weight: 600; }

.nav-branding {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
  white-space: nowrap;
}

/* ---- Section wrapper ---- */
.identity-section {
  padding: var(--sp-xl) var(--sp-md);
  border-bottom: 1px solid var(--page-border);
}

.identity-section:last-of-type { border-bottom: none; }

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

/* ---- Section header ---- */
.section-tag {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--sp-sm);
}

.section-name {
  font-family: 'Switzer', 'General Sans', sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

.section-voice {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--accent);
  margin-bottom: var(--sp-lg);
  letter-spacing: 0.04em;
}

/* ---- Palette strip ---- */
.palette-strip {
  display: flex;
  gap: var(--sp-sm);
  flex-wrap: wrap;
  margin-bottom: var(--sp-lg);
  align-items: flex-start;
}

.swatch-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 120px;
}

.swatch-chip {
  width: 100%;
  height: 40px;
  border-radius: 4px;
  border: 1px solid oklch(0.78 0.01 85 / 0.5);
}

.swatch-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--page-mid);
  line-height: 1.3;
  word-break: break-all;
}

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

/* ---- Type pairing row ---- */
.type-pairing {
  margin-bottom: var(--sp-lg);
  padding: var(--sp-md) 0;
  border-top: 1px solid var(--page-border);
  border-bottom: 1px solid var(--page-border);
}

.type-row {
  display: flex;
  gap: var(--sp-md);
  flex-wrap: wrap;
  align-items: baseline;
  margin-bottom: var(--sp-sm);
}

.type-display {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--page-ink);
}

.type-mono-sample {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
  letter-spacing: 0.05em;
}

.type-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--page-mid);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: var(--sp-xs);
}

/* ---- Marks grid ---- */
.marks-grid {
  display: flex;
  flex-direction: column;
  gap: var(--sp-lg);
  margin-bottom: var(--sp-lg);
}

.mark-row {
  display: flex;
  flex-direction: column;
  gap: var(--sp-md);
}

.mark-row-label {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--sp-xs);
}

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

.size-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-xs);
}

.size-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--page-mid);
  letter-spacing: 0.08em;
}

/* Light and dark demo panels */
.demo-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-sm);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: var(--sp-sm);
}

.demo-panel {
  padding: var(--sp-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-md);
  flex-wrap: wrap;
  min-height: 100px;
}

.demo-panel--light {
  background: oklch(0.97 0.006 90);
  border: 1px solid oklch(0.88 0.008 85);
}

.demo-panel--dark {
  background: oklch(0.18 0.012 250);
}

.demo-panel--dark img {
  filter: invert(1);
}

.panel-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
  margin-top: var(--sp-xs);
  color: var(--page-mid);
}

/* Mark specific light/dark display */
.mark-display {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ---- Mark rationale + score ---- */
.mark-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-md);
  padding: var(--sp-sm) 0;
  border-top: 1px solid var(--page-border);
  flex-wrap: wrap;
}

.mark-rationale {
  font-size: var(--fs-sm);
  color: var(--page-mid);
  max-width: 60ch;
  line-height: 1.5;
}

.mark-score {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ---- Favicon chip ---- */
.favicon-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--page-white);
  border: 1px solid var(--page-border);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  margin-bottom: var(--sp-md);
}

.favicon-chip-label {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
}

/* ---- OG card mockup ---- */
.og-mockup {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--page-border);
  box-shadow: 0 4px 24px oklch(0.22 0.01 80 / 0.10);
  margin-bottom: var(--sp-md);
  max-width: 600px;
}

.og-card {
  aspect-ratio: 1200/630;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2em 3em;
  gap: 2em;
}

.og-card-content {
  flex: 1;
  min-width: 0;
}

.og-card-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.55em;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-bottom: 0.5em;
}

.og-card-name {
  font-size: clamp(1.1em, 3vw, 1.6em);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 0.4em;
}

.og-card-role {
  font-size: 0.55em;
  opacity: 0.65;
  line-height: 1.4;
}

.og-card-mark {
  flex-shrink: 0;
  width: 20%;
}

.og-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--page-mid);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: var(--sp-xs);
  padding: 0 var(--sp-sm);
  text-align: right;
}

/* ---- Lockup ---- */
.lockup-demo {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md);
  background: var(--page-white);
  border: 1px solid var(--page-border);
  border-radius: 8px;
  margin-bottom: var(--sp-md);
  max-width: 480px;
}

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

.lockup-name {
  font-weight: 700;
  font-size: var(--fs-md);
  line-height: 1.1;
  color: var(--page-ink);
  letter-spacing: -0.01em;
}

.lockup-role {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--page-mid);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---- Section-level theming ---- */
/* SEAL */
[data-identity="seal"] {
  --accent: oklch(0.62 0.10 75);
  --section-bg: oklch(0.975 0.005 88);
}

/* APERTURE */
[data-identity="aperture"] {
  --accent: oklch(0.66 0.13 230);
  --section-bg: oklch(0.97 0.005 220);
}

/* SPECIMEN */
[data-identity="specimen"] {
  --accent: oklch(0.52 0.08 250);
  --section-bg: oklch(0.975 0.004 95);
}

/* KNOT */
[data-identity="knot"] {
  --accent: oklch(0.60 0.15 160);
  --section-bg: oklch(0.972 0.006 140);
}

/* STAMP */
[data-identity="stamp"] {
  --accent: oklch(0.55 0.19 28);
  --section-bg: oklch(0.975 0.006 30);
}

.identity-section[data-identity] {
  background: var(--section-bg);
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .page-header {
    padding: var(--sp-md) var(--sp-sm) var(--sp-lg);
  }
  .identity-section {
    padding: var(--sp-lg) var(--sp-sm);
  }
  .palette-strip {
    gap: var(--sp-xs);
  }
  .swatch-group {
    min-width: 90px;
  }
  .demo-panels {
    grid-template-columns: 1fr;
  }
  .og-card {
    padding: 1.5em 1.5em;
  }
  .lockup-demo {
    gap: var(--sp-sm);
  }
  .nav-inner {
    gap: var(--sp-sm);
    padding: 0 var(--sp-sm);
  }
  .nav-branding { display: none; }
}

/* ---- Divider ---- */
.section-divider {
  height: 1px;
  background: var(--page-border);
  margin: var(--sp-lg) 0;
}

/* ---- Focus visible global ---- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Utility ---- */
.mono { font-family: var(--font-mono); }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ---- SVG mark sizing ---- */
.mark-96 { width: 96px; height: 96px; }
.mark-48 { width: 48px; height: 48px; }
.mark-24 { width: 24px; height: 24px; }

/* On dark panel, override fill for currentColor marks */
.demo-panel--dark .mark-96,
.demo-panel--dark .mark-48,
.demo-panel--dark .mark-24 {
  filter: invert(1) hue-rotate(180deg);
}
/* Specific: aperture + knot + seal-mono use currentColor, invert works.
   Seal-medallion + stamp + specimen use explicit OKLCH colors -- invert partially.
   For gallery purposes this is the correct visual approach. */

/* ---- Page footer ---- */
.page-footer {
  padding: var(--sp-lg) var(--sp-md);
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-md);
  border-top: 1px solid var(--page-border);
  margin-top: 0;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--page-mid);
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--page-mid);
  letter-spacing: 0.08em;
}

/* Demo panel marks: explicit color overrides for dark surface */
.panel-dark-mark {
  filter: none;
}

/* For dark panel: certain marks need explicit light color treatment */
.demo-panel--dark .seal-dark,
.demo-panel--dark .specimen-dark {
  filter: invert(1);
}

/* Aperture on dark: accent color pops, no invert needed */
.demo-panel--dark .aperture-noinvert {
  filter: none;
}