/* ---------- tokens ---------- */
:root {
  --surface:   oklch(0.96 0.008 80);
  --surface-2: oklch(0.93 0.010 80);
  --ink:       oklch(0.18 0.015 250);
  --ink-2:     oklch(0.45 0.015 250);
  --accent:    oklch(0.45 0.13 250);

  --font-sans: 'General Sans Variable', 'General Sans', ui-sans-serif, system-ui, sans-serif;

  --type-xs: 0.75rem;
  --type-s:  1rem;
  --type-m:  1.5rem;
  --type-l:  2.5rem;
  --type-display: clamp(4rem, 9vw, 11rem);

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  1rem;
  --space-4:  1.5rem;
  --space-6:  2.5rem;
  --space-8:  4rem;
  --space-12: 6rem;
  --space-20: 12rem;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-in:  240ms;
  --dur-out: 160ms;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--type-s);
  line-height: 1.5;
  font-feature-settings: "ss01", "tnum";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
ol, ul { list-style: none; margin: 0; padding: 0; }
img { display: block; max-width: 100%; }

/* ---------- topbar ---------- */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--space-4) var(--space-6);
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  z-index: 50;
  mix-blend-mode: difference;
  color: white;
}
.topbar .mark { font-weight: 500; }
.topbar-controls { display: flex; gap: var(--space-6); }
.lang-toggle, .motion-toggle {
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.lang-toggle .sep { opacity: 0.4; margin: 0 0.2em; }
.lang-toggle [data-lang-en],
.lang-toggle [data-lang-es] { opacity: 0.4; transition: opacity var(--dur-out) var(--ease); }
[data-lang="en"] .lang-toggle [data-lang-en],
[data-lang="es"] .lang-toggle [data-lang-es] { opacity: 1; }

/* ---------- hero / wordmark ---------- */
.hero {
  padding: calc(var(--space-20) + var(--space-6)) var(--space-6) var(--space-8);
  max-width: 50vw;
}
.wordmark {
  font-size: var(--type-display);
  font-weight: 400;
  line-height: 0.85;
  letter-spacing: -0.04em;
  margin: 0 0 var(--space-6);
}
.wordmark > span {
  display: block;
  opacity: 0;
  transform: translateY(0.12em);
  animation: wordmark-reveal 700ms var(--ease) forwards;
}
.wordmark > span:nth-child(1) { animation-delay: 100ms; }
.wordmark > span:nth-child(2) { animation-delay: 220ms; }
.wordmark > span:nth-child(3) { animation-delay: 340ms; }
.wordmark .dot { display: inline; color: var(--accent); }

@keyframes wordmark-reveal {
  to { opacity: 1; transform: translateY(0); }
}

.hero-meta {
  font-size: var(--type-s);
  color: var(--ink-2);
  max-width: 38ch;
  margin: 0;
}

/* ---------- index-section ---------- */
.index-section {
  padding: 0 var(--space-6) var(--space-20);
  max-width: 50vw;
}

/* ---------- filters ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-block: var(--space-4);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  margin-bottom: var(--space-6);
}
.filter-chip {
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-2);
  transition: color var(--dur-out) var(--ease);
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
}
.filter-chip .count {
  font-feature-settings: "tnum";
  font-size: 0.7em;
  opacity: 0.7;
}
.filter-chip:hover { color: var(--ink); }
.filter-chip[aria-selected="true"] { color: var(--accent); }

/* ---------- project rows ---------- */
.project-list { counter-reset: row; }
.project-row {
  display: grid;
  grid-template-columns: 3ch 7ch 1fr;
  align-items: baseline;
  gap: var(--space-4);
  padding-block: var(--space-3);
  border-top: 1px solid color-mix(in oklch, var(--ink), transparent 85%);
  cursor: pointer;
  transition: background-color var(--dur-out) var(--ease),
              padding var(--dur-out) var(--ease);
}
.project-row:last-child {
  border-bottom: 1px solid color-mix(in oklch, var(--ink), transparent 85%);
}
.project-row[hidden] { display: none; }
.project-row .row-num,
.project-row .row-year {
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  font-feature-settings: "tnum";
  color: var(--ink-2);
  text-transform: uppercase;
}
.project-row .row-main {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
}
.project-row .row-title {
  font-size: var(--type-m);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.project-row .row-medium {
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-2);
  white-space: nowrap;
}
.project-row:hover {
  background: var(--surface-2);
  padding-inline: var(--space-3);
  border-radius: 2px;
}
.project-row:hover .row-title { color: var(--accent); }

/* ---------- preview slab ---------- */
.preview-slab {
  position: fixed;
  top: 0;
  right: 0;
  width: 50vw;
  height: 100vh;
  pointer-events: none;
  opacity: 0;
  transform: scale(1.02);
  filter: blur(8px);
  transition: opacity var(--dur-out) var(--ease),
              transform var(--dur-out) var(--ease),
              filter var(--dur-out) var(--ease);
  z-index: 1;
  padding: var(--space-6);
}
.preview-slab[data-active="true"] {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
  transition-duration: var(--dur-in);
}
.preview-inner {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-3);
  position: relative;
  overflow: hidden;
}
.preview-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.preview-caption {
  position: relative;
  z-index: 1;
  color: var(--surface);
  padding: var(--space-3);
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: linear-gradient(0deg,
              color-mix(in oklch, var(--ink), transparent 30%) 0%,
              transparent 100%);
  margin: calc(-1 * var(--space-3));
}
.preview-title { font-size: var(--type-s); text-transform: none; letter-spacing: 0; margin: 0 0 var(--space-1); }
.preview-meta { margin: 0; opacity: 0.85; }

/* ---------- contact ---------- */
.contact {
  border-top: 1px solid var(--ink);
  padding: var(--space-8) var(--space-6) var(--space-12);
  max-width: 50vw;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
.contact .kicker {
  font-size: var(--type-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 var(--space-2);
}
.contact p { margin: 0; }
.contact a { border-bottom: 1px solid currentColor; padding-bottom: 1px; }

/* ---------- bilingual visibility (handled by JS swapping textContent) ---------- */

/* ---------- reduce motion ---------- */
body[data-motion="off"] *,
body[data-motion="off"] *::before,
body[data-motion="off"] *::after {
  transition-duration: 0ms !important;
  animation-duration: 0ms !important;
  animation-delay: 0ms !important;
  animation-iteration-count: 1 !important;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
    animation-delay: 0ms !important;
  }
}

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .hero, .index-section, .contact { max-width: 100%; }
  .preview-slab {
    width: 100vw;
    height: 50vh;
    top: auto;
    bottom: 0;
    transform: translateY(8px);
  }
  .preview-slab[data-active="true"] { transform: translateY(0); }
}

@media (max-width: 639px) {
  .hero { padding-top: var(--space-12); }
  .wordmark { font-size: clamp(3.5rem, 17vw, 6rem); }
  .project-row { grid-template-columns: 3ch 1fr; }
  .project-row .row-year { display: none; }
  .project-row .row-main { flex-direction: column; align-items: flex-start; gap: var(--space-1); }
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .preview-slab { display: none; }
  .project-row[aria-expanded="true"] {
    background: var(--surface-2);
    padding-inline: var(--space-3);
  }
  .project-row .inline-thumb { display: none; }
  .project-row[aria-expanded="true"] .inline-thumb {
    display: block;
    grid-column: 1 / -1;
    margin-top: var(--space-3);
    aspect-ratio: 4 / 3;
    background: var(--ink-2);
  }
}