/* ===================================================
   Thomas Peng · Identity System
   Brand4 — static gallery, no framework
   OKLCH color system, hairline editorial layout
   =================================================== */

/* ---- Fonts ---------------------------------------- */
@font-face {
  font-family: "Cabinet Grotesk";
  src: url("fonts/CabinetGrotesk-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/JetBrainsMono-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ---- Tokens --------------------------------------- */
:root {
  /* Neutrals — tinted blue-grey */
  --c-bg:       oklch(97.5% 0.006 245);
  --c-surface:  oklch(99%   0.004 245);
  --c-border:   oklch(87%   0.008 245);
  --c-muted:    oklch(62%   0.012 245);
  --c-body:     oklch(28%   0.016 245);
  --c-heading:  oklch(14%   0.020 245);

  /* Dark surfaces */
  --c-dark:     oklch(12%   0.020 245);
  --c-dark-2:   oklch(17%   0.018 245);
  --c-dark-border: oklch(28% 0.020 245);
  --c-dark-muted:  oklch(52% 0.018 245);
  --c-dark-body:   oklch(82% 0.010 245);
  --c-dark-head:   oklch(96% 0.006 245);

  /* Accent — cyan (primary recommendation) */
  --c-cyan:     oklch(55%   0.12  220);
  --c-cyan-dim: oklch(45%   0.10  220);

  /* Accent — rust */
  --c-rust:     oklch(52%   0.13  35);
  --c-rust-dim: oklch(44%   0.11  35);

  /* Type scales */
  --f-grotesk: "Cabinet Grotesk", system-ui, sans-serif;
  --f-mono:    "JetBrains Mono", ui-monospace, monospace;

  /* Layout */
  --max-w:     1080px;
  --gutter:    clamp(24px, 5vw, 80px);
  --section-gap: 120px;
  --col-gap: 32px;

  /* Motion */
  --dur: 200ms;
}

/* ---- Reset ---------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--c-bg);
  color: var(--c-body);
  font-family: var(--f-mono);
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; }
a { color: inherit; text-decoration: none; }

/* ---- Skip link ------------------------------------ */
.skip-link {
  position: fixed;
  top: -100px;
  left: var(--gutter);
  z-index: 999;
  background: var(--c-heading);
  color: var(--c-surface);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 10px 20px;
  border-radius: 2px;
  transition: top var(--dur) ease;
}
.skip-link:focus {
  top: 16px;
}

/* ---- Hairline rule -------------------------------- */
.rule {
  border: none;
  border-top: 1px solid var(--c-border);
  width: 100%;
}

/* ---- Layout shell --------------------------------- */
.site-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---- Hero intro ----------------------------------- */
.intro {
  padding-top: clamp(72px, 10vw, 140px);
  padding-bottom: clamp(64px, 8vw, 120px);
}
.intro__eyebrow {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 32px;
}
.intro__headline {
  font-family: var(--f-grotesk);
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
  color: var(--c-heading);
  margin-bottom: 28px;
}
.intro__caption {
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 300;
  color: var(--c-muted);
  max-width: 480px;
  line-height: 1.7;
}

/* ---- Section shell -------------------------------- */
.section {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}
.section + .section {
  border-top: 1px solid var(--c-border);
}
.section__label {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.section__label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--c-border);
}
.section__title {
  font-family: var(--f-grotesk);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--c-heading);
  margin-bottom: 12px;
}
.section__sub {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 300;
  color: var(--c-muted);
  margin-bottom: 56px;
  max-width: 540px;
  line-height: 1.7;
}

/* ---- Mark stage ----------------------------------- */
.mark-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  border-radius: 4px;
  overflow: hidden;
}
.mark-stage__panel {
  padding: clamp(40px, 6vw, 80px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  min-height: 340px;
}
.mark-stage__panel--light {
  background: var(--c-surface);
  color: var(--c-heading);
}
.mark-stage__panel--dark {
  background: var(--c-dark);
  color: var(--c-dark-head);
}
.mark-stage__mark {
  width: 96px;
  height: 96px;
  flex-shrink: 0;
}
.mark-stage__mark--lg {
  width: 120px;
  height: 120px;
}
.mark-stage__caption {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-align: center;
  opacity: 0.45;
}
.mark-stage__panel--dark .mark-stage__caption {
  opacity: 0.38;
}

/* ---- Favicon chip --------------------------------- */
.favicon-row {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 48px;
}
.browser-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 7px 16px 7px 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--c-body);
}
.browser-tab__favicon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}
.browser-tab__label {
  opacity: 0.7;
}
.favicon-chip-label {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
}

/* ---- Mark construction note ----------------------- */
.construct-note {
  margin-top: 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px 24px;
  align-items: start;
  max-width: 480px;
}
.construct-note__num {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--c-muted);
  letter-spacing: 0.1em;
  padding-top: 1px;
}
.construct-note__text {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 300;
  color: var(--c-muted);
  line-height: 1.7;
}

/* ---- Accent options ------------------------------- */
.accent-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  border-radius: 4px;
  overflow: hidden;
}
.accent-card {
  background: var(--c-surface);
  padding: clamp(32px, 5vw, 60px) 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  border: 1px solid var(--c-border);
}
.accent-card__mark {
  width: 80px;
  height: 80px;
  color: var(--c-heading);
}
.accent-card__label {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-heading);
}
.accent-card__desc {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 300;
  color: var(--c-muted);
  text-align: center;
  line-height: 1.6;
}
.accent-card--rec {
  background: var(--c-heading);
  color: var(--c-surface);
  border-color: var(--c-heading);
}
.accent-card--rec .accent-card__mark {
  color: var(--c-surface);
}
.accent-card--rec .accent-card__label {
  color: var(--c-surface);
}
.accent-card--rec .accent-card__desc {
  color: oklch(65% 0.008 245);
}
.accent-card__rec-badge {
  font-family: var(--f-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--c-cyan);
  color: oklch(98% 0.004 245);
  padding: 3px 8px;
  border-radius: 2px;
}

/* ---- Lockup rows ---------------------------------- */
.lockup-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.lockup-variant {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.lockup-variant__label {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
  padding: 0 0 12px 0;
}

/* Individual lockup display panels */
.lockup-panel {
  padding: clamp(24px, 4vw, 44px);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  border-radius: 3px;
}
.lockup-panel--light {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
}
.lockup-panel--dark {
  background: var(--c-dark);
}

/* Horizontal lockup: mark + text side by side */
.lockup-h {
  display: flex;
  align-items: center;
  gap: 16px;
}
.lockup-h__mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}
.lockup-h__text {}
.lockup-h__name {
  display: block;
  line-height: 1.1;
}
.lockup-h__tag {
  display: block;
  line-height: 1.2;
  margin-top: 2px;
}

/* Stacked lockup: mark above text, centered */
.lockup-v {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}
.lockup-v__mark {
  width: 52px;
  height: 52px;
}
.lockup-v__name {
  display: block;
  line-height: 1.1;
}
.lockup-v__tag {
  display: block;
  line-height: 1.2;
  margin-top: 1px;
}

/* Mark only */
.lockup-mark-only {
  display: flex;
  align-items: center;
  justify-content: center;
}
.lockup-mark-only__mark {
  width: 56px;
  height: 56px;
}

/* Grotesk lockup typography */
.type-grotesk .lockup-h__name {
  font-family: var(--f-grotesk);
  font-weight: 500;
  font-size: 20px;
  letter-spacing: -0.02em;
}
.type-grotesk .lockup-h__tag {
  font-family: var(--f-grotesk);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.04em;
  opacity: 0.52;
}
.type-grotesk .lockup-v__name {
  font-family: var(--f-grotesk);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.type-grotesk .lockup-v__tag {
  font-family: var(--f-grotesk);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.04em;
  opacity: 0.52;
}

/* Mono lockup typography */
.type-mono .lockup-h__name {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.type-mono .lockup-h__tag {
  font-family: var(--f-mono);
  font-weight: 300;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.48;
}
.type-mono .lockup-v__name {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.type-mono .lockup-v__tag {
  font-family: var(--f-mono);
  font-weight: 300;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.48;
}

/* Dark panel color overrides */
.lockup-panel--dark .lockup-h__name,
.lockup-panel--dark .lockup-v__name {
  color: var(--c-dark-head);
}
.lockup-panel--dark .lockup-h__tag,
.lockup-panel--dark .lockup-v__tag {
  color: var(--c-dark-body);
}

/* Sub-row for horizontal+stacked in a small grid */
.lockup-sub-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

/* Lockup type header */
.lockup-type-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
}
.lockup-type-name {
  font-family: var(--f-grotesk);
  font-size: 18px;
  font-weight: 500;
  color: var(--c-heading);
  letter-spacing: -0.01em;
}
.lockup-type-meta {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 300;
  color: var(--c-muted);
}

.lockup-wrapper {
  margin-bottom: 64px;
}
.lockup-wrapper:last-child {
  margin-bottom: 0;
}

.lockup-3col {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 2px;
}
.lockup-3col .lockup-panel {
  min-height: 160px;
}

.lockup-theme-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}

/* ---- In-context: site header ---------------------- */
.context-section {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mock-browser {
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--c-border);
}
.mock-browser__chrome {
  background: oklch(94% 0.006 245);
  border-bottom: 1px solid var(--c-border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.mock-browser__dots {
  display: flex;
  gap: 5px;
}
.mock-browser__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-border);
}
.mock-browser__url {
  flex: 1;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 3px;
  padding: 4px 10px;
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--c-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.mock-browser__url-favicon {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}
.mock-browser__body {
  background: var(--c-dark);
  padding: 0;
}

/* Site header mockup */
.mock-header {
  background: var(--c-dark);
  border-bottom: 1px solid var(--c-dark-border);
  padding: 0 clamp(24px, 4vw, 56px);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mock-header__brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.mock-header__mark {
  width: 28px;
  height: 28px;
  color: var(--c-dark-head);
}
.mock-header__name {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 14px;
  letter-spacing: -0.01em;
  color: var(--c-dark-head);
}
.mock-header__tag {
  font-family: var(--f-mono);
  font-weight: 300;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-dark-muted);
  margin-top: 1px;
}
.mock-header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.mock-header__nav li a {
  font-family: var(--f-mono);
  font-weight: 300;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-dark-muted);
  transition: color var(--dur) ease;
}
.mock-header__nav li a:hover {
  color: var(--c-dark-body);
}
.mock-header__cta {
  background: transparent;
  border: 1px solid var(--c-dark-border);
  color: var(--c-dark-body);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.06em;
  padding: 8px 18px;
  border-radius: 2px;
  cursor: pointer;
  transition: border-color var(--dur) ease, color var(--dur) ease;
  min-height: 44px;
}
.mock-header__cta:hover {
  border-color: var(--c-dark-body);
  color: var(--c-dark-head);
}
.mock-header__cta:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

/* Mock hero below header */
.mock-hero {
  padding: clamp(32px, 5vw, 64px) clamp(24px, 4vw, 56px);
}
.mock-hero__eyebrow {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-dark-muted);
  margin-bottom: 20px;
}
.mock-hero__headline {
  font-family: var(--f-grotesk);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.08;
  color: var(--c-dark-head);
  margin-bottom: 20px;
  max-width: 520px;
}
.mock-hero__headline span {
  color: var(--c-cyan);
}
.mock-hero__sub {
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 300;
  color: var(--c-dark-muted);
  max-width: 400px;
  line-height: 1.7;
}

/* ---- Business card crop --------------------------- */
.bcard-wrap {
  margin-top: 2px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}
.bcard {
  aspect-ratio: 85/55;
  padding: clamp(20px, 4%, 32px) clamp(24px, 5%, 40px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 4px;
  overflow: hidden;
}
.bcard--light {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-heading);
}
.bcard--dark {
  background: var(--c-dark);
  color: var(--c-dark-head);
}
.bcard__top {
  display: flex;
  align-items: center;
  gap: 10px;
}
.bcard__mark {
  width: 22px;
  height: 22px;
}
.bcard__name {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 13px;
  letter-spacing: -0.01em;
}
.bcard__bottom {}
.bcard__title {
  font-family: var(--f-mono);
  font-weight: 300;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: 4px;
}
.bcard__email {
  font-family: var(--f-mono);
  font-weight: 300;
  font-size: 10px;
  letter-spacing: 0.02em;
  opacity: 0.6;
}
.bcard__mark--light { color: var(--c-heading); }
.bcard__mark--dark  { color: var(--c-dark-head); }

/* ---- Colour specs --------------------------------- */
.color-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.color-chip {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.color-chip__swatch {
  width: 48px;
  height: 48px;
  border-radius: 3px;
  border: 1px solid var(--c-border);
}
.color-chip__label {
  font-family: var(--f-mono);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  text-transform: uppercase;
}
.color-chip__value {
  font-family: var(--f-mono);
  font-size: 9px;
  font-weight: 300;
  color: var(--c-muted);
}

/* ---- Type specimens ------------------------------- */
.type-specimen {
  border: 1px solid var(--c-border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 2px;
}
.type-specimen__header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.type-specimen__face {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-heading);
}
.type-specimen__meta {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 300;
  color: var(--c-muted);
}
.type-specimen__body {
  padding: 32px 24px;
  background: var(--c-bg);
}
.type-specimen__sample--grotesk {
  font-family: var(--f-grotesk);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--c-heading);
}
.type-specimen__sample--mono {
  font-family: var(--f-mono);
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--c-heading);
}
.type-specimen__pair {
  margin-top: 16px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 300;
  color: var(--c-muted);
  line-height: 1.7;
}

/* ---- Footer --------------------------------------- */
.site-footer {
  padding: 48px 0 56px;
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer__copy {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 300;
  color: var(--c-muted);
  letter-spacing: 0.06em;
}
.site-footer__mark {
  width: 20px;
  height: 20px;
  color: var(--c-muted);
  opacity: 0.4;
}

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

/* ---- Reduced motion ------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ---- Mobile --------------------------------------- */
@media (max-width: 640px) {
  :root { --section-gap: 72px; }

  .mark-stage {
    grid-template-columns: 1fr;
  }
  .accent-grid {
    grid-template-columns: 1fr;
  }
  .lockup-3col {
    grid-template-columns: 1fr;
  }
  .lockup-theme-pair {
    grid-template-columns: 1fr;
  }
  .bcard-wrap {
    grid-template-columns: 1fr;
  }
  .mock-header__nav {
    display: none;
  }
  .mock-header__cta {
    display: none;
  }
  .intro__headline {
    letter-spacing: -0.02em;
  }
  .lockup-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .type-specimen__sample--grotesk {
    font-size: 24px;
  }
  .type-specimen__sample--mono {
    font-size: 18px;
  }
}