/* =========================================================
   Christian Chiroque Ruiz — Personal Site
   Tokens, themes, layout, components, animations.
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  /* Accent (cyan default; tweak swaps the hue/triad) */
  --accent-1: oklch(78% 0.16 200);          /* cyan */
  --accent-2: oklch(68% 0.20 300);          /* violet */
  --accent-1-rgb: 34 211 238;
  --accent-2-rgb: 168 85 247;

  /* Density (spacing scale multiplier) */
  --density: 1;

  /* Type */
  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* Radii / motion */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;
  --ease: cubic-bezier(.2,.7,.2,1);

  /* Layout */
  --maxw: 1200px;
  --gutter: clamp(20px, 4vw, 48px);
  --section-pad: calc(120px * var(--density));

  /* Card style flag (set by Tweaks) */
  --card-bg: rgba(255,255,255,0.02);
  --card-border: 1px solid rgba(255,255,255,0.08);
  --card-blur: 0px;
  --card-shadow: none;
}

/* Dark (default) */
:root[data-theme="dark"] {
  --bg: oklch(14% 0.012 260);
  --bg-2: oklch(17% 0.014 260);
  --bg-3: oklch(20% 0.016 260);
  --fg: oklch(96% 0.01 260);
  --fg-2: oklch(78% 0.012 260);
  --fg-3: oklch(58% 0.012 260);
  --line: oklch(100% 0 0 / 0.08);
  --line-strong: oklch(100% 0 0 / 0.16);
  --card-bg: oklch(20% 0.014 260 / 0.5);
  --grid-line: oklch(100% 0 0 / 0.04);
  --grid-line-bright: oklch(100% 0 0 / 0.10);
  --shadow-glow: 0 0 60px -20px var(--accent-1);
}

/* Light */
:root[data-theme="light"] {
  --bg: oklch(98% 0.005 260);
  --bg-2: oklch(96% 0.006 260);
  --bg-3: oklch(94% 0.008 260);
  --fg: oklch(20% 0.012 260);
  --fg-2: oklch(38% 0.012 260);
  --fg-3: oklch(55% 0.010 260);
  --line: oklch(20% 0.012 260 / 0.10);
  --line-strong: oklch(20% 0.012 260 / 0.20);
  --card-bg: oklch(100% 0 0 / 0.7);
  --grid-line: oklch(20% 0.012 260 / 0.04);
  --grid-line-bright: oklch(20% 0.012 260 / 0.10);
  --shadow-glow: 0 10px 40px -20px oklch(20% 0.012 260 / 0.4);
  --accent-1: oklch(60% 0.16 200);
  --accent-2: oklch(54% 0.22 300);
}

/* Card-style variants (tweakable) */
:root[data-card="bordered"] {
  --card-bg: transparent;
  --card-border: 1px solid var(--line);
  --card-blur: 0px;
  --card-shadow: none;
}
:root[data-card="glass"] {
  --card-bg: color-mix(in oklch, var(--bg-2) 70%, transparent);
  --card-border: 1px solid var(--line);
  --card-blur: 12px;
  --card-shadow: 0 1px 0 oklch(100% 0 0 / 0.04) inset;
}
:root[data-card="flat"] {
  --card-bg: var(--bg-2);
  --card-border: 1px solid transparent;
  --card-blur: 0px;
  --card-shadow: none;
}

/* Density variants */
:root[data-density="compact"]  { --density: 0.78; }
:root[data-density="cozy"]     { --density: 1; }
:root[data-density="spacious"] { --density: 1.22; }

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-display);
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: color-mix(in oklch, var(--accent-1) 40%, transparent); color: var(--fg); }

/* ---------- Container ---------- */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in oklch, var(--bg) 70%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-block: 14px;
}
.nav__brand {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.nav__brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-1);
  box-shadow: 0 0 12px var(--accent-1);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%,100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.7; }
}
.nav__links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}
.nav__link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 8px 12px;
  border-radius: var(--r-sm);
  color: var(--fg-2);
  position: relative;
  transition: color .2s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 4px;
  height: 1px;
  background: var(--accent-1);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav__link:hover { color: var(--fg); }
.nav__link:hover::after,
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--fg); }

.nav__tools {
  display: flex;
  gap: 8px;
  align-items: center;
}
.icon-btn {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  color: var(--fg-2);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.icon-btn:hover { color: var(--fg); border-color: var(--line-strong); background: var(--bg-2); }
.icon-btn svg { width: 16px; height: 16px; }

.lang-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 0 10px;
  width: auto;
  min-width: 36px;
  height: 36px;
  letter-spacing: 0.04em;
}
.lang-btn .lang-current { color: var(--fg); }
.lang-btn .lang-sep { opacity: 0.4; padding: 0 4px; }

/* Hamburger button — hidden on desktop */
.nav__burger { display: none; }
.nav__burger-box {
  position: relative;
  width: 18px;
  height: 12px;
  display: block;
}
.nav__burger-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.6px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s var(--ease), top .3s var(--ease);
}
.nav__burger-line:nth-child(1) { top: 0; }
.nav__burger-line:nth-child(2) { top: 5px; }
.nav__burger-line:nth-child(3) { top: 10px; }
.nav.is-open .nav__burger-line:nth-child(1) { top: 5px; transform: rotate(45deg); }
.nav.is-open .nav__burger-line:nth-child(2) { opacity: 0; }
.nav.is-open .nav__burger-line:nth-child(3) { top: 5px; transform: rotate(-45deg); }

.nav__scrim {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: oklch(0% 0 0 / 0.5);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease);
}
.nav.is-open .nav__scrim { opacity: 1; pointer-events: auto; }

@media (max-width: 760px) {
  .nav__burger { display: inline-flex; }

  .nav__links {
    position: fixed;
    top: 64px;
    left: 12px;
    right: 12px;
    flex-direction: column;
    gap: 2px;
    padding: 10px;
    background: color-mix(in oklch, var(--bg-2) 96%, transparent);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: 0 24px 60px -20px rgb(0 0 0 / 0.5);
    z-index: 45;
    /* hidden state */
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
    transform-origin: top right;
    pointer-events: none;
    transition: opacity .25s var(--ease), transform .25s var(--ease);
  }
  .nav.is-open .nav__links {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
  .nav__link {
    font-size: 15px;
    font-family: var(--font-display);
    padding: 13px 14px;
    border-radius: var(--r-sm);
  }
  .nav__link::after { display: none; }
  .nav__link:hover,
  .nav__link.is-active { background: color-mix(in oklch, var(--accent-1) 14%, transparent); }
  .nav.is-open .nav__scrim { opacity: 1; }
}

/* ---------- Section primitives ---------- */
section {
  padding-block: var(--section-pad);
  position: relative;
}
.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-1);
  text-transform: uppercase;
  margin: 0 0 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.kicker::before {
  content: "";
  width: 24px; height: 1px;
  background: var(--accent-1);
  display: inline-block;
}
.section-title {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  font-weight: 500;
  text-wrap: balance;
}
.section-sub {
  color: var(--fg-2);
  max-width: 56ch;
  margin: 0 0 calc(48px * var(--density));
  text-wrap: pretty;
}
.section-head { margin-bottom: calc(48px * var(--density)); }

/* ---------- Hero ---------- */
.hero {
  min-height: min(100svh, 900px);
  padding-top: max(140px, calc(120px * var(--density)));
  display: flex;
  align-items: center;
  position: relative;
}
.hero__grid-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
  mask-image: radial-gradient(ellipse at 70% 40%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 40%, black 30%, transparent 75%);
}
.hero__grid-bg svg { width: 100%; height: 100%; }

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
  width: 100%;
}
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--fg-3);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-bottom: 28px;
}
.hero__eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: oklch(78% 0.18 145);
  box-shadow: 0 0 8px oklch(78% 0.18 145);
}
.hero__name {
  font-size: clamp(44px, 7vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  margin: 0 0 16px;
  font-weight: 500;
}
.hero__name .accent {
  background: linear-gradient(120deg, oklch(72% 0.10 220), oklch(70% 0.12 280));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
:root[data-theme="light"] .hero__name .accent {
  background: linear-gradient(120deg, oklch(52% 0.14 230), oklch(50% 0.16 290));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__role {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--fg-2);
  margin: 0 0 24px;
  letter-spacing: 0.02em;
}
.hero__role span + span::before {
  content: "·";
  padding: 0 10px;
  color: var(--fg-3);
}
.hero__tagline {
  font-size: clamp(16px, 1.4vw, 19px);
  color: var(--fg-2);
  max-width: 56ch;
  margin: 0 0 36px;
  text-wrap: pretty;
}
.hero__cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  border: 1px solid var(--line);
  color: var(--fg);
  background: var(--bg-2);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--line-strong); }
.btn--primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn--primary:hover {
  background: var(--accent-1);
  color: var(--bg);
  border-color: var(--accent-1);
  box-shadow: 0 8px 24px -10px var(--accent-1);
}
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 520px;
}
.stat__num {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1;
  font-feature-settings: "tnum";
}
.stat__num .plus { color: var(--accent-1); margin-left: 2px; }
.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  margin-top: 6px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-wrap: balance;
}

/* Hero portrait */
.hero__portrait {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-2);
}
.hero__portrait img {
  width: 100%; height: 100%; object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}
.hero__socials {
  position: absolute;
  left: 12px; bottom: 12px;
  z-index: 3;
  display: flex;
  gap: 8px;
}
.hero__social {
  width: 38px; height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: oklch(12% 0.012 260 / 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid oklch(100% 0 0 / 0.16);
  color: oklch(96% 0 0);
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}
.hero__social svg { width: 16px; height: 16px; }
.hero__social:hover {
  transform: translateY(-3px);
  background: var(--accent-1);
  border-color: var(--accent-1);
  color: var(--bg);
}
.hero__portrait-meta {
  position: absolute;
  inset: auto 12px 12px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg);
  display: flex;
  justify-content: space-between;
  letter-spacing: 0.04em;
  z-index: 2;
  pointer-events: none;
}
.hero__portrait-meta .k { color: var(--accent-1); }
.hero__portrait-corner {
  position: absolute;
  width: 18px; height: 18px;
  border: 1px solid var(--accent-1);
  z-index: 2;
}
.hero__portrait-corner.tl { top: 8px; left: 8px; border-right: 0; border-bottom: 0; }
.hero__portrait-corner.tr { top: 8px; right: 8px; border-left: 0; border-bottom: 0; }
.hero__portrait-corner.bl { bottom: 8px; left: 8px; border-right: 0; border-top: 0; }
.hero__portrait-corner.br { bottom: 8px; right: 8px; border-left: 0; border-top: 0; }

@media (max-width: 880px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__portrait { max-width: 360px; }
  .hero__stats { grid-template-columns: repeat(3, 1fr); gap: 16px; }
}
@media (max-width: 480px) {
  .hero__stats { grid-template-columns: 1fr 1fr; }
  .hero__stats > :nth-child(3) { grid-column: span 2; }
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}
.about__copy p { color: var(--fg-2); margin: 0 0 16px; max-width: 60ch; }
.about__video {
  margin: 8px 0 24px;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-2);
  aspect-ratio: 16/9;
  max-width: 60ch;
}
.about__video iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}
.about__skills {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 24px;
  background: var(--card-bg);
}
.about__skills h3 {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.skill-list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
}

/* Education list (replaces skill-list in About) */
.edu-list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.edu-item {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 14px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  position: relative;
}
.edu-item:first-child { border-top: 0; padding-top: 4px; }
.edu-step {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-1);
  border: 1px solid var(--accent-1);
  border-radius: 4px;
  padding: 4px 0;
  text-align: center;
  align-self: start;
  margin-top: 2px;
}
.edu-body { min-width: 0; }
.edu-degree {
  margin: 0 0 3px;
  font-size: 14.5px;
  letter-spacing: -0.005em;
  text-wrap: balance;
}
.edu-inst {
  margin: 0 0 6px;
  font-size: 12.5px;
  color: var(--fg-2);
  text-wrap: balance;
}
.edu-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.edu-status {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-3);
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  white-space: nowrap;
  align-self: start;
  margin-top: 2px;
}
.edu-status--active {
  color: oklch(78% 0.18 145);
  border-color: oklch(78% 0.18 145);
}
.skill-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.skill-list li:first-child { border-top: 0; }
.skill-list .skill-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  width: 24px;
}
.skill-list .skill-bar {
  margin-left: auto;
  width: 100px;
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}
.skill-list .skill-bar::after {
  content: "";
  position: absolute; inset: 0 auto 0 0;
  width: var(--w, 80%);
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  border-radius: 2px;
}
@media (max-width: 880px) {
  .about__grid { grid-template-columns: 1fr; }
}

/* ---------- Cards (Blog & Projects) ---------- */
.card-grid {
  display: grid;
  gap: 20px;
}
.blog-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.project-grid { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px;
  border-radius: var(--r-md);
  background: var(--card-bg);
  border: var(--card-border);
  backdrop-filter: blur(var(--card-blur));
  -webkit-backdrop-filter: blur(var(--card-blur));
  box-shadow: var(--card-shadow);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
  overflow: hidden;
  isolation: isolate;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%), color-mix(in oklch, var(--accent-1) 14%, transparent), transparent 50%);
  opacity: 0;
  transition: opacity .3s var(--ease);
  pointer-events: none;
  z-index: -1;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.card:hover::before { opacity: 1; }

.card__tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--accent-1);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.card__title {
  font-size: 19px;
  line-height: 1.25;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.card__excerpt {
  color: var(--fg-2);
  font-size: 14.5px;
  margin: 0 0 20px;
  flex: 1;
}
.card__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-3);
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.card__more {
  color: var(--fg-2);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color .2s var(--ease);
}
.card__link {
  font-family: var(--font-mono);
  font-size: 12px;
}
.card:hover .card__more { color: var(--accent-1); }

/* Project tech tags */
.tags {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin: 14px 0 16px;
}
.tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--bg-3);
  color: var(--fg-2);
  border: 1px solid var(--line);
  letter-spacing: 0.03em;
}

/* Project mini-thumbnail (abstract data-viz style) */
.proj-thumb {
  height: 120px;
  border-radius: var(--r-sm);
  margin-bottom: 18px;
  background: var(--bg-3);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.proj-thumb svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.proj-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Blog card thumbnail (optional image at top of card) */
.card-thumb {
  height: 150px;
  border-radius: var(--r-sm);
  margin: -4px 0 18px;
  background: var(--bg-3);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s var(--ease);
}
.card:hover .card-thumb img { transform: scale(1.05); }
.card-thumb svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* ---------- Teaching ---------- */
.inst-logos {
  margin-bottom: calc(40px * var(--density));
}
.inst-logos__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 16px;
}
.inst-logos__row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.inst-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 46px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
  flex: 0 1 auto;
}
.inst-logo:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px -16px rgb(0 0 0 / 0.5);
}
.inst-logo img {
  height: 78px;
  width: auto;
  object-fit: contain;
  display: block;
}
@media (max-width: 560px) {
  .inst-logo { flex: 1 1 100%; padding: 24px 30px; }
  .inst-logo img { height: 62px; }
}

.teach-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.teach-row {
  display: grid;
  grid-template-columns: 60px minmax(0, 1.6fr) minmax(0, 1.4fr) minmax(0, 1fr) auto;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: background .25s var(--ease);
  position: relative;
}
.teach-row:hover { background: color-mix(in oklch, var(--accent-1) 5%, transparent); }
.teach-row::before {
  content: "";
  position: absolute;
  left: 0; top: 28px; bottom: 28px;
  width: 2px;
  background: var(--accent-1);
  transform: scaleY(0);
  transition: transform .3s var(--ease);
}
.teach-row:hover::before { transform: scaleY(1); }
.teach-row__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-3);
  padding-left: 12px;
}
.teach-row__name { font-size: 18px; letter-spacing: -0.01em; margin: 0; }
.teach-row__inst { color: var(--fg-2); font-size: 14px; margin: 4px 0 0; }
.teach-row__prog {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-3);
  letter-spacing: 0.02em;
  text-wrap: balance;
}
.teach-row__desc {
  color: var(--fg-2);
  font-size: 13.5px;
  text-wrap: pretty;
}
.teach-row__badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-1);
  border: 1px solid var(--accent-1);
  padding: 6px 10px;
  border-radius: 4px;
  align-self: start;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background .2s var(--ease), color .2s var(--ease);
  text-decoration: none;
}
.teach-row__link:hover {
  background: var(--accent-1);
  color: var(--bg);
}
.teach-row__link .arrow { transition: transform .2s var(--ease); }
.teach-row__link:hover .arrow { transform: translate(2px, -2px); }
@media (max-width: 880px) {
  .teach-row { grid-template-columns: 1fr; gap: 8px; padding: 24px 0; }
  .teach-row__num { display: none; }
  .teach-row__badge { justify-self: start; }
}

/* ---------- Data Política ---------- */
.dp {
  border-radius: var(--r-lg);
  background:
    radial-gradient(ellipse at 0% 0%, color-mix(in oklch, var(--accent-2) 22%, transparent), transparent 60%),
    radial-gradient(ellipse at 100% 100%, color-mix(in oklch, var(--accent-1) 22%, transparent), transparent 60%),
    var(--bg-2);
  border: 1px solid var(--line);
  padding: clamp(32px, 5vw, 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
  position: relative;
  overflow: hidden;
}
.dp::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, transparent 30%, black);
  -webkit-mask-image: radial-gradient(ellipse at center, transparent 30%, black);
  pointer-events: none;
  opacity: 0.6;
}
.dp__inner { position: relative; z-index: 1; }
.dp__title {
  font-size: clamp(36px, 5vw, 60px);
  letter-spacing: -0.025em;
  margin: 0 0 12px;
  font-weight: 500;
}
.dp__sub {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-3);
  margin: 0 0 20px;
  letter-spacing: 0.02em;
}
.dp__desc { color: var(--fg-2); margin: 0 0 28px; max-width: 52ch; text-wrap: pretty; }
.dp__topics {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 0 0 28px;
}

.dp__visual {
  position: relative;
  z-index: 1;
  aspect-ratio: 1.1;
  border-radius: var(--r-md);
  background: var(--bg-3);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.dp__play {
  width: 88px; height: 88px;
  border-radius: 50%;
  background: var(--accent-1);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  box-shadow: 0 12px 60px -10px var(--accent-1);
  transition: transform .3s var(--ease);
}
.dp__play:hover { transform: scale(1.08); }
.dp__play svg { width: 30px; height: 30px; margin-left: 4px; }
.dp__play::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px solid var(--accent-1);
  opacity: 0.5;
  animation: ring 2.6s var(--ease) infinite;
}
@keyframes ring {
  0% { transform: scale(0.9); opacity: .8; }
  100% { transform: scale(1.4); opacity: 0; }
}
.dp__visual--logo {
  background: #000;
  border-color: oklch(30% 0 0);
}
.dp__visual--logo::before { display: none; }
.dp__logo {
  position: relative;
  z-index: 1;
  width: 62%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 8px 28px oklch(0% 0 0 / 0.6));
  transition: transform .4s var(--ease);
}
.dp__visual--logo:hover .dp__logo { transform: scale(1.04); }
.dp__visual::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 50% 50%, transparent 30%, color-mix(in oklch, var(--bg-3) 50%, transparent)),
    repeating-linear-gradient(90deg, transparent 0, transparent 14px, var(--grid-line-bright) 14px, var(--grid-line-bright) 15px);
  opacity: 0.5;
}
.dp__counter {
  position: absolute;
  top: 18px; left: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.dp__counter strong { color: var(--accent-1); font-weight: 500; }

@media (max-width: 880px) {
  .dp { grid-template-columns: 1fr; }
  .dp__visual { max-width: 420px; }
}

/* ---------- Events ---------- */
.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.event-card {
  position: relative;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--bg-2);
  aspect-ratio: 4 / 5;
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}
.event-card:hover { transform: translateY(-3px); border-color: var(--line-strong); }

.event-card__ph {
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(135deg,
      var(--bg-3) 0 12px,
      var(--bg-2) 12px 24px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.event-card__img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  cursor: zoom-in;
  transition: transform .5s var(--ease);
}
.event-card:hover .event-card__img { transform: scale(1.04); }
.event-card:has(.event-card__img) .event-card__meta {
  background: linear-gradient(180deg, transparent, oklch(0% 0 0 / 0.85));
  color: oklch(98% 0 0);
}
.event-card:has(.event-card__img) .event-card__title { color: oklch(98% 0 0); }
.event-card:has(.event-card__img) .event-card__where { color: oklch(85% 0 0); }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed; inset: 0;
  z-index: 200;
  background: oklch(0% 0 0 / 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 48px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s var(--ease), visibility .3s var(--ease);
}
.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}
.lightbox__inner {
  position: relative;
  max-width: min(1280px, 100%);
  max-height: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transform: scale(0.96);
  transition: transform .3s var(--ease);
}
.lightbox.is-open .lightbox__inner { transform: scale(1); }
.lightbox__img {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 140px);
  object-fit: contain;
  border-radius: var(--r-md);
  box-shadow: 0 30px 80px oklch(0% 0 0 / 0.5);
  background: var(--bg-2);
}
.lightbox__caption {
  font-family: var(--font-mono);
  font-size: 13px;
  color: oklch(85% 0 0);
  text-align: center;
  letter-spacing: 0.02em;
  text-wrap: balance;
  padding: 0 8px;
}
.lightbox__close {
  position: absolute;
  top: 18px; right: 22px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: oklch(20% 0 0 / 0.7);
  border: 1px solid oklch(100% 0 0 / 0.15);
  color: oklch(95% 0 0);
  font-size: 28px; line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s var(--ease);
  z-index: 1;
}
.lightbox__close:hover {
  background: oklch(30% 0 0 / 0.9);
  transform: rotate(90deg);
}
.event-card__meta {
  position: absolute;
  inset: auto 0 0 0;
  padding: 16px;
  background: linear-gradient(180deg, transparent, color-mix(in oklch, var(--bg) 85%, transparent));
}
.event-card__title {
  font-size: 14.5px;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.event-card__where {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  display: flex;
  justify-content: space-between;
}

/* ---------- Contact ---------- */
.contact {
  text-align: left;
}
.contact__big {
  font-size: clamp(40px, 6vw, 76px);
  letter-spacing: -0.025em;
  line-height: 1.02;
  margin: 0 0 24px;
  font-weight: 500;
}
.contact__sub {
  color: var(--fg-2);
  max-width: 56ch;
  margin: 0 0 48px;
}
.contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  border-top: 1px solid var(--line);
  padding-top: 36px;
}
.contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.contact__email {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.contact__email-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  border: 1px solid var(--line);
  padding: 4px 8px;
  border-radius: 4px;
  color: var(--fg-3);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.contact__email-copy:hover { color: var(--accent-1); border-color: var(--accent-1); }
.contact__email-copy.copied { color: var(--accent-1); border-color: var(--accent-1); }

.socials {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.social {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg);
  transition: color .2s var(--ease), padding .2s var(--ease);
}
.social .arrow { transition: transform .25s var(--ease); color: var(--fg-3); }
.social:hover { color: var(--accent-1); padding-left: 6px; }
.social:hover .arrow { transform: translate(4px, -4px); color: var(--accent-1); }
.social__name { font-family: var(--font-display); font-size: 16px; }
.social__handle { color: var(--fg-3); margin-left: auto; padding: 0 16px; }

@media (max-width: 760px) {
  .contact__row { grid-template-columns: 1fr; gap: 28px; }
}

/* ---------- Footer ---------- */
/* ---------- Teaching materials ---------- */
.materials {
  margin-top: calc(64px * var(--density));
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
.materials__head { margin-bottom: 28px; }
.materials__title {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}
.materials__sub {
  margin: 0;
  color: var(--fg-3);
  font-family: var(--font-mono);
  font-size: 12.5px;
}
.materials__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.material {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 20px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--card-bg);
  backdrop-filter: blur(var(--card-blur));
  -webkit-backdrop-filter: blur(var(--card-blur));
  transition: transform .3s var(--ease), border-color .3s var(--ease);
  text-decoration: none;
  color: inherit;
}
.material:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.material__cover {
  position: relative;
  aspect-ratio: 3/4;
  border-radius: 4px;
  padding: 12px 10px 10px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  color: oklch(98% 0 0);
  font-family: var(--font-mono);
  box-shadow:
    -2px 0 0 oklch(0% 0 0 / 0.3),
    4px 4px 12px -4px oklch(0% 0 0 / 0.4);
}
.material__cover[data-cover="1"] {
  background: linear-gradient(135deg, oklch(35% 0.16 260), oklch(22% 0.10 260));
}
.material__cover[data-cover="2"] {
  background: linear-gradient(135deg, oklch(40% 0.18 200), oklch(22% 0.10 200));
}
.material__cover[data-cover="3"] {
  background: linear-gradient(135deg, oklch(38% 0.18 320), oklch(22% 0.12 280));
}
.material__cover::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid oklch(100% 0 0 / 0.18);
  border-radius: 2px;
  pointer-events: none;
}
/* When a real cover image is provided */
.material__cover-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
}
.material__cover.has-img { padding: 0; }
.material__cover.has-img .material__spine,
.material__cover.has-img .material__cover-title,
.material__cover.has-img .material__cover-author { display: none; }
.material__cover.has-img::before { z-index: 3; }
.material__spine {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 6px;
  background: linear-gradient(90deg, oklch(0% 0 0 / 0.4), transparent);
}
.material__cover-title {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.2;
  position: relative;
  z-index: 1;
  text-wrap: balance;
}
.material__cover-author {
  font-size: 8.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
  position: relative;
  z-index: 1;
}
.material__meta { min-width: 0; display: flex; flex-direction: column; }
.material__name {
  margin: 0 0 6px;
  font-size: 15px;
  letter-spacing: -0.005em;
  font-weight: 500;
  text-wrap: balance;
}
.material__desc {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--fg-2);
  flex: 1;
}
.material__cta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--accent-1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.material__cta .arrow { transition: transform .2s var(--ease); }
.material:hover .material__cta .arrow { transform: translate(2px, -2px); }

/* ---------- Hero canvas (AI graph) ---------- */
#hero-graph {
  width: 100%;
  height: 100%;
  display: block;
}

/* ---------- Data Política — latest videos ---------- */
.dp-latest {
  margin-top: calc(48px * var(--density));
}
.dp-latest__head { margin-bottom: 24px; }
.dp-latest__title {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}
.dp-latest__sub {
  margin: 0;
  color: var(--fg-3);
  font-family: var(--font-mono);
  font-size: 12.5px;
}
.dp-latest__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}
.dp-video {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-2);
}
.dp-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-3);
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Tweaks panel ---------- */
.tweaks {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  width: 280px;
  background: color-mix(in oklch, var(--bg-2) 96%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  display: none;
  box-shadow: 0 20px 60px -20px rgb(0 0 0 / 0.4);
}
.tweaks.is-open { display: block; }
.tweaks__head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px;
}
.tweaks__title {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.tweaks__close {
  width: 22px; height: 22px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-3);
}
.tweaks__close:hover { color: var(--fg); background: var(--bg-3); }
.tweaks__group { margin-bottom: 14px; }
.tweaks__label {
  font-size: 10.5px;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
  display: block;
}
.tweaks__row { display: flex; gap: 6px; flex-wrap: wrap; }
.tweaks__chip {
  flex: 1;
  min-width: 0;
  text-align: center;
  padding: 7px 10px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg-3);
  color: var(--fg-2);
  font-size: 11px;
  letter-spacing: 0.02em;
  transition: all .2s var(--ease);
  white-space: nowrap;
}
.tweaks__chip:hover { color: var(--fg); border-color: var(--line-strong); }
.tweaks__chip.is-active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.tweaks__swatches { display: flex; gap: 8px; }
.tweaks__sw {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  outline: 1px solid var(--line);
  outline-offset: 2px;
  cursor: pointer;
  transition: outline-color .2s var(--ease);
}
.tweaks__sw.is-active { outline-color: var(--fg); }
.tweaks__toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg-3);
  font-size: 11px;
  color: var(--fg-2);
  justify-content: space-between;
}
.tweaks__sw.is-active::after {
  content: ""; display: block; width: 100%; height: 100%; border-radius: 50%;
  border: 2px solid var(--bg);
}

/* Toggle dot */
.toggle-dot {
  width: 28px; height: 16px;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  position: relative;
  flex-shrink: 0;
  transition: background .2s var(--ease);
}
.toggle-dot::after {
  content: "";
  position: absolute;
  top: 1px; left: 1px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--fg-3);
  transition: transform .2s var(--ease), background .2s var(--ease);
}
.toggle-dot.is-on { background: var(--accent-1); }
.toggle-dot.is-on::after { transform: translateX(12px); background: var(--bg); }