/* =========================================================
   Renato Quiliche — portfolio
   Palette tokens are defined once on :root, then swapped
   for dark mode (system preference + manual override).
   ========================================================= */

:root {
  --bg:          #fbfbf9;
  --bg-raised:   #ffffff;
  --bg-sunken:   #f2f2ee;
  --text:        #17181c;
  --text-muted:  #5c6068;
  --border:      #e2e2dc;
  --accent:      #1f4b8e;
  --accent-soft: #eaf0fa;
  --shadow:      0 1px 2px rgba(20,22,28,.05), 0 8px 24px rgba(20,22,28,.05);

  --maxw: 1040px;
  --radius: 10px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:          #0f1114;
    --bg-raised:   #16191d;
    --bg-sunken:   #1b1f24;
    --text:        #e8e9ea;
    --text-muted:  #9aa0a8;
    --border:      #272c32;
    --accent:      #7aa7e8;
    --accent-soft: #182534;
    --shadow:      0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg:          #0f1114;
  --bg-raised:   #16191d;
  --bg-sunken:   #1b1f24;
  --text:        #e8e9ea;
  --text-muted:  #9aa0a8;
  --border:      #272c32;
  --accent:      #7aa7e8;
  --accent-soft: #182534;
  --shadow:      0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}

/* ---------- base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

code {
  font-family: var(--mono);
  font-size: .875em;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: .1em .35em;
}

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }

.skip {
  position: absolute; left: -9999px;
  background: var(--accent); color: #fff; padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

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

/* ---------- header / nav ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex; align-items: center; gap: 24px;
  height: 60px;
}

.brand {
  font-weight: 700; font-size: 17px; letter-spacing: .04em;
  color: var(--text); text-decoration: none;
}

.nav-links {
  display: flex; gap: 22px;
  list-style: none; margin: 0; padding: 0;
  margin-left: auto;
  font-size: 14.5px;
}
.nav-links a { color: var(--text-muted); text-decoration: none; }
.nav-links a:hover { color: var(--text); }

.theme-toggle {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-muted);
  width: 34px; height: 34px; border-radius: 8px;
  cursor: pointer; font-size: 15px; line-height: 1;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-muted); }

@media (max-width: 720px) {
  .nav-links { display: none; }
  .theme-toggle { margin-left: auto; }
}

/* ---------- hero ---------- */

.hero { padding: 88px 24px 64px; }

/* Full-bleed artwork behind the landing hero. The image's off-white
   background is blended into the page, and inverted for dark mode. */
.hero-art {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-inline: 0;
  background: var(--bg);
}
.hero-art::before {
  content: "";
  position: absolute; top: 0; right: 0; bottom: 0; z-index: -1;
  width: 56%;
  background: url("../img/hero.jpg") right center / cover no-repeat;
  mix-blend-mode: darken;
  -webkit-mask-image: linear-gradient(to right, transparent 10%, #000 45%),
                      linear-gradient(to bottom, #000 80%, transparent);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(to right, transparent 10%, #000 45%),
              linear-gradient(to bottom, #000 80%, transparent);
  mask-composite: intersect;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hero-art::before {
    filter: invert(1) hue-rotate(180deg);
    mix-blend-mode: lighten;
  }
}
:root[data-theme="dark"] .hero-art::before {
  filter: invert(1) hue-rotate(180deg);
  mix-blend-mode: lighten;
}
/* Narrow screens: the art moves below the call-to-action as a strip. */
@media (max-width: 1180px) {
  .hero-art { padding-bottom: 240px; }
  .hero-art::before {
    width: min(100%, 520px); top: auto; height: 280px;
    background-size: auto 280px;
    background-position: right bottom;
    -webkit-mask-image: linear-gradient(to bottom, transparent, #000 30%, #000 85%, transparent),
                        linear-gradient(to right, transparent, #000 35%);
    mask-image: linear-gradient(to bottom, transparent, #000 30%, #000 85%, transparent),
                linear-gradient(to right, transparent, #000 35%);
  }
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 13px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-muted); font-weight: 600;
}

.hero h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -.02em;
  font-weight: 700;
}

.role {
  margin: 14px 0 0;
  font-size: clamp(16px, 2.4vw, 19px);
  color: var(--accent);
  font-weight: 500;
}

.lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: clamp(16.5px, 2.2vw, 18.5px);
  color: var(--text-muted);
}

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-raised);
  color: var(--text);
  font-size: 15px; font-weight: 500;
  text-decoration: none;
}
.btn:hover { border-color: var(--text-muted); }
.btn-primary {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn-primary:hover { filter: brightness(1.08); border-color: var(--accent); }

.links {
  display: flex; flex-wrap: wrap; gap: 8px 24px;
  list-style: none; margin: 32px 0 0; padding: 0;
  font-size: 15px;
}
.links.big { font-size: 17px; margin-top: 20px; }

/* ---------- sections ---------- */

.section { padding: 56px 24px; }

.section-title {
  margin: 0 0 28px;
  font-size: 14px; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--text-muted);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.prose { max-width: 68ch; }
.prose p { margin: 0 0 16px; }

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}
@media (max-width: 800px) { .about-grid { grid-template-columns: 1fr; gap: 28px; } }

.facts {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}
.facts h3 {
  margin: 0 0 16px;
  font-size: 13px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-muted);
}
.facts dl { margin: 0; }
.facts dl > div + div { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }
.facts dt { font-size: 13px; color: var(--text-muted); font-weight: 600; }
.facts dd { margin: 3px 0 0; font-size: 14.5px; }

/* ---------- filters ---------- */

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }

.chip {
  font: inherit; font-size: 14px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-raised);
  color: var(--text-muted);
  cursor: pointer;
}
.chip:hover { color: var(--text); }
.chip.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

/* ---------- project cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
}
.card[hidden] { display: none; }

.card-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 14px;
}
.card-head h3 {
  margin: 0;
  font-size: 18px; line-height: 1.35; letter-spacing: -.01em;
}
.year {
  font-family: var(--mono); font-size: 12.5px;
  color: var(--text-muted); white-space: nowrap;
}

.card-sub {
  margin: 8px 0 14px;
  font-size: 14.5px; color: var(--accent); font-weight: 500;
}
.card p { margin: 0 0 12px; font-size: 15px; }

.metrics {
  display: flex; gap: 26px;
  list-style: none; margin: 6px 0 16px; padding: 14px 0 0;
  border-top: 1px solid var(--border);
}
.metrics li { display: flex; flex-direction: column; }
.metrics b { font-size: 21px; font-weight: 700; letter-spacing: -.02em; }
.metrics span { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; }

.tags {
  display: flex; flex-wrap: wrap; gap: 6px;
  list-style: none; margin: auto 0 0; padding: 14px 0 0;
}
.tags li {
  font-family: var(--mono); font-size: 11.5px;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 8px;
  color: var(--text-muted);
}

.card-links { display: flex; gap: 18px; margin: 14px 0 0 !important; font-size: 14.5px; font-weight: 500; }

/* ---------- publications ---------- */

.pubs { list-style: none; margin: 0; padding: 0; }
.pubs li {
  display: grid; grid-template-columns: 70px 1fr; gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
}
.pubs li:last-child { border-bottom: 1px solid var(--border); }
@media (max-width: 560px) { .pubs li { grid-template-columns: 1fr; gap: 4px; } }

.pub-year { font-family: var(--mono); font-size: 14px; color: var(--text-muted); }
.pub-title { margin: 0; font-weight: 600; font-size: 16px; line-height: 1.4; }
.pub-venue { margin: 4px 0 6px; font-size: 14.5px; color: var(--text-muted); }
.pubs a { font-family: var(--mono); font-size: 13px; }

/* ---------- skills ---------- */

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.skill {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.skill h3 {
  margin: 0 0 8px;
  font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent);
}
.skill p { margin: 0; font-size: 14.5px; color: var(--text-muted); }

/* ---------- footer ---------- */

.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  padding: 30px 0 50px;
  font-size: 14px;
}
.site-footer p { margin: 0; }
.muted { color: var(--text-muted); margin-top: 4px !important; }

/* ---------- project pages ---------- */

.page-hero { padding-bottom: 32px; }
.eyebrow .back { color: inherit; text-decoration: none; }
.eyebrow .back:hover { color: var(--accent); }

.metrics-wide { flex-wrap: wrap; gap: 18px 32px; margin-top: 30px; }
.tags-inline { margin-top: 4px; }

.sub { margin: 36px 0 12px; font-size: 17px; letter-spacing: -.01em; }

/* Figures are rendered on white, so keep a white frame in dark mode too. */
.fig { margin: 28px 0 8px; }
.fig-frame {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow);
}
.fig-frame img { display: block; width: 100%; }
.fig figcaption {
  margin-top: 10px; max-width: 80ch;
  font-size: 14px; color: var(--text-muted);
}
@media (max-width: 640px) {
  .fig-wide .fig-frame { overflow-x: auto; }
  .fig-wide .fig-frame img { width: 640px; max-width: none; }
}

.eq {
  margin: 18px 0 10px;
  padding: 6px 20px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}
.eq .katex-display { margin: .9em 0; overflow-x: auto; overflow-y: hidden; }
.eq-note { font-size: 15px; color: var(--text-muted); }

.list { margin: 0; padding-left: 1.2em; }
.list li { margin-bottom: 10px; }

.cols-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.callout {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-top: 3px solid var(--callout, var(--accent));
  border-radius: var(--radius);
  padding: 16px 18px;
}
.callout h3 { margin: 0 0 6px; font-size: 14px; }
.callout p { margin: 0; font-size: 14.5px; color: var(--text-muted); }
.c-a { --callout: #3a6fd8; }
.c-b { --callout: #e0663a; }
.c-c { --callout: #1fa37a; }

.takeaways {
  margin-top: 28px; max-width: 68ch;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
}
.takeaways h3 {
  margin: 0 0 10px;
  font-size: 13px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent);
}
.takeaways ol { margin: 0; padding-left: 1.2em; }
.takeaways li { margin-bottom: 8px; }

.page-links { margin-top: 24px !important; }

@media print {
  .site-header, .filters, .cta-row, .theme-toggle { display: none; }
  .card { break-inside: avoid; box-shadow: none; }
}