/* ========== Base / Theme ========== */
:root {
  --bg: #0b1020;
  --card: #121831;
  --surface: #0f1429;
  --text: #e6e9f5;
  --muted: #9aa3b2;
  --brand: #7c91ff;
  --brand-2: #51c4ff;
  --ring: rgba(124,145,255,.35);
  --shadow: 0 10px 30px rgba(9, 12, 22, .35);
  --radius: 16px;
}

:root.light {
  --bg: #f7f8fb;
  --card: #ffffff;
  --surface: #ffffff;
  --text: #0f1222;
  --muted: #616b7a;
  --brand: #3b5bff;
  --brand-2: #00a8ff;
  --ring: rgba(59,91,255,.25);
  --shadow: 0 10px 30px rgba(10, 15, 35, .08);
}

/* Respecta preferencia del usuario la primera vez */
@media (prefers-color-scheme: light) {
  :root:not(.dark):not(.light) { color-scheme: light; }
}
@media (prefers-color-scheme: dark) {
  :root:not(.dark):not(.light) { color-scheme: dark; }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, rgba(124,145,255,.15), transparent 60%),
              radial-gradient(1000px 500px at 110% 10%, rgba(81,196,255,.14), transparent 60%),
              var(--bg);
  color: var(--text);
  background-attachment: fixed;
  line-height: 1.6;
}

/* Utilities */
.container { max-width: 1100px; margin-inline: auto; padding: 0 20px; }
.grid-2 { display: grid; grid-template-columns: 1.15fr .85fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 900px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.section { padding: 72px 0; }
.section__header { margin-bottom: 24px; }
.section__title { font-size: clamp(28px, 4vw, 40px); margin: 0 0 4px; letter-spacing: -0.02em; }
.section__desc { margin: 0; color: var(--muted); }

/* Chips & links */
.chip {
  display: inline-block;
  background: color-mix(in oklab, var(--brand) 16%, transparent);
  color: var(--brand-2);
  border: 1px solid color-mix(in oklab, var(--brand) 35%, transparent);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.link { color: var(--brand-2); text-decoration: none; border-bottom: 1px dashed currentColor; }
.link:hover { opacity: .85; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn--primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  box-shadow: 0 8px 22px var(--ring);
}
.btn--primary:hover { transform: translateY(-2px); }
.btn--ghost {
  background: transparent; color: var(--text);
  border-color: color-mix(in oklab, var(--brand) 40%, transparent);
}
.btn--ghost:hover { transform: translateY(-2px); box-shadow: 0 8px 22px var(--ring); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in oklab, var(--muted) 20%, transparent);
}
.brand { font-weight: 800; letter-spacing: -0.02em; color: var(--text); text-decoration: none; }
.nav { display: contents; }
.nav__list { display: flex; gap: 18px; list-style: none; margin: 0; padding: 0; }
.nav__list a { color: var(--muted); text-decoration: none; font-weight: 600; }
.nav__list a:hover { color: var(--text); }
.nav__toggle { display: none; background: none; border: 0; color: var(--text); }
.nav__bar { width: 22px; height: 2px; background: currentColor; display: block; margin: 4px 0; border-radius: 99px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

@media (max-width: 860px) {
  .nav__toggle { display: inline-block; }
  .nav__list {
    position: fixed; inset: 60px 12px auto 12px;
    display: grid; gap: 8px;
    background: var(--surface);
    border: 1px solid color-mix(in oklab, var(--muted) 20%, transparent);
    border-radius: 12px;
    padding: 10px;
    transform-origin: top right;
    transform: scale(.98) translateY(-8px);
    opacity: 0; visibility: hidden;
    box-shadow: var(--shadow);
  }
  .nav__list.is-open { opacity: 1; visibility: visible; transform: none; }
}

/* Theme Toggle */
.theme-toggle {
  margin-left: 10px;
  background: color-mix(in oklab, var(--surface) 85%, transparent);
  border: 1px solid color-mix(in oklab, var(--muted) 20%, transparent);
  color: var(--text);
  border-radius: 999px;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  cursor: pointer;
}
.theme-toggle .icon { width: 20px; height: 20px; display: none; }
:root.light .icon-sun, :root.dark .icon-moon { display: block; }
:root:not(.light):not(.dark) .icon-moon { display: block; } /* default dark */

/* Hero */
.hero {
  position: relative; display: grid; grid-template-columns: 1.2fr .8fr; gap: 24px;
  align-items: center; padding: 72px 20px; container-type: inline-size;
}
.hero__content { max-width: 680px; margin-inline: auto; }
.hero__badge {
  display: inline-block; font-weight: 700; font-size: 12px; letter-spacing: .04em;
  padding: 8px 12px; border-radius: 999px; color: var(--brand-2);
  background: color-mix(in oklab, var(--brand) 20%, transparent);
  border: 1px solid color-mix(in oklab, var(--brand) 35%, transparent);
}
.hero__title { font-size: clamp(36px, 8cqi, 62px); margin: 10px 0 8px; letter-spacing: -0.03em; }
.hero__subtitle { color: var(--muted); margin: 0 0 18px; }
.hero__cta { display: flex; gap: 12px; }
.hero__avatar { justify-self: center; }
.hero__avatar img {
  width: clamp(200px, 38cqi, 320px);
  height: clamp(200px, 38cqi, 320px);
  object-fit: cover; border-radius: 50%;
  box-shadow: 0 30px 60px var(--ring);
  border: 6px solid color-mix(in oklab, var(--brand) 15%, transparent);
}
.hero__bg {
  position: absolute; inset: 0;
  background: radial-gradient(500px 220px at 15% 25%, rgba(124,145,255,.15), transparent 60%),
              radial-gradient(500px 220px at 85% 75%, rgba(81,196,255,.14), transparent 60%);
  z-index: -1;
}
.gradient-text { background: linear-gradient(90deg, var(--brand), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; text-align: center; }
  .hero__cta { justify-content: center; }
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid color-mix(in oklab, var(--muted) 20%, transparent);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card--accent { border-color: color-mix(in oklab, var(--brand) 35%, transparent); }

.list { padding-left: 18px; margin: 0; }
.list li + li { margin-top: 6px; }

/* Timeline */
.timeline { list-style: none; padding: 0; margin: 0; position: relative; }
.timeline:before {
  content: ""; position: absolute; left: 10px; top: 0; bottom: 0;
  width: 2px; background: color-mix(in oklab, var(--muted) 20%, transparent);
}
.timeline__item { display: grid; grid-template-columns: 120px 1fr; gap: 14px; padding-left: 12px; margin-bottom: 18px; }
.timeline__point { color: var(--muted); font-weight: 700; }
.timeline__card { background: var(--surface); border: 1px solid color-mix(in oklab, var(--muted) 20%, transparent); border-radius: 12px; padding: 14px; }

/* Project cards */
.project-card {
  background: var(--surface);
  border: 1px solid color-mix(in oklab, var(--muted) 20%, transparent);
  border-radius: 16px; overflow: hidden; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
}
.project-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px var(--ring); }
.project-card__image { display: block; aspect-ratio: 16/9; overflow: hidden; }
.project-card__image img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .35s ease; }
.project-card:hover img { transform: scale(1.04); }
.project-card__body { padding: 16px; }
.project-card__body h3 { margin: 0 0 6px; }
.project-card__body p { margin: 0 0 8px; color: var(--muted); }

/* Skills */
.skills {
  display: flex; flex-wrap: wrap; gap: 10px;
  list-style: none; margin: 0; padding: 0;
}
.skills li {
  background: color-mix(in oklab, var(--brand) 16%, transparent);
  border: 1px solid color-mix(in oklab, var(--brand) 35%, transparent);
  color: var(--brand-2);
  padding: 8px 12px; border-radius: 999px; font-weight: 700; font-size: 12px;
}

/* Contact */
.contact__list { list-style: none; padding: 0; margin: 0; }
.contact__list li + li { margin-top: 10px; }
.map { width: 100%; aspect-ratio: 16/9; border: 0; border-radius: 12px; }

/* Footer */
.site-footer {
  padding: 36px 20px; text-align: center; color: var(--muted);
  border-top: 1px solid color-mix(in oklab, var(--muted) 20%, transparent);
  margin-top: 40px;
}

/* ========== Reveal Animations (IntersectionObserver) ========== */
.reveal { opacity: 0; transform: translateY(10px) scale(.98); }
.reveal[data-reveal="fade"] { transform: none; }
.reveal[data-reveal="float"] { transform: translateY(12px) scale(1); }
.reveal[data-reveal^="slide"] { transform: translateX(-16px); }

.reveal.is-visible { 
  opacity: 1; transform: none; 
  transition: opacity .6s cubic-bezier(.2,.7,.2,1), transform .6s cubic-bezier(.2,.7,.2,1);
}
.reveal.is-visible[data-reveal$="delay"]   { transition-delay: .08s; }
.reveal.is-visible[data-reveal$="delay-2"] { transition-delay: .16s; }
.reveal.is-visible[data-reveal$="delay-3"] { transition-delay: .24s; }
.reveal.is-visible[data-reveal$="delay-4"] { transition-delay: .32s; }
.reveal.is-visible[data-reveal$="delay-5"] { transition-delay: .40s; }

/* Motion reduce */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
  .btn, .project-card, .hero__avatar img { transition: none !important; }
}