/* ============================================================
   Santiago Vasconcello — Portfolio
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --font-body: "Inter", system-ui, sans-serif;
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --accent-1: #22d3ee;
  --accent-2: #818cf8;
  --gradient: linear-gradient(120deg, var(--accent-1), var(--accent-2));

  --nav-h: 72px;
  --radius: 14px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #070b14;
  --bg-alt: #0a1020;
  --surface: rgba(148, 163, 184, 0.06);
  --surface-hover: rgba(148, 163, 184, 0.12);
  --border: rgba(148, 163, 184, 0.16);
  --text: #e6eaf2;
  --text-muted: #94a3b8;
  --nav-bg: rgba(7, 11, 20, 0.72);
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.7);
  --glow: rgba(129, 140, 248, 0.35);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7fb;
  --bg-alt: #eef1f8;
  --surface: rgba(15, 23, 42, 0.04);
  --surface-hover: rgba(15, 23, 42, 0.08);
  --border: rgba(15, 23, 42, 0.12);
  --text: #0f172a;
  --text-muted: #556074;
  --nav-bg: rgba(246, 247, 251, 0.75);
  --shadow: 0 20px 50px -24px rgba(15, 23, 42, 0.25);
  --glow: rgba(129, 140, 248, 0.25);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

html[lang="ja"] body { font-family: "Inter", "Noto Sans JP", system-ui, sans-serif; }
html[lang="ja"] .hero-name,
html[lang="ja"] .hero-role,
html[lang="ja"] h2 { font-family: "Space Grotesk", "Noto Sans JP", sans-serif; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; background: none; border: none; cursor: pointer; color: inherit; }

.container { width: min(1120px, 100% - 3rem); margin-inline: auto; }

::selection { background: var(--accent-2); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 3px;
  border-radius: 4px;
}

.grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px; width: 0%;
  background: var(--gradient);
  z-index: 200;
}

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--accent-1); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}

.nav-link {
  position: relative;
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color 0.25s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 100%; height: 2px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }

.nav-cv { margin-left: 0.4rem; }

.nav-actions { display: flex; align-items: center; gap: 0.75rem; }

/* ---------- Lang dropdown ---------- */
.lang-select { position: relative; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0 0.6rem;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.25s, border-color 0.25s, transform 0.25s;
}
.lang-btn:hover { color: var(--text); border-color: var(--accent-2); transform: translateY(-2px); }
.lang-btn svg { width: 16px; height: 16px; }
.lang-current { font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.02em; }
.lang-chev { width: 12px !important; height: 12px !important; transition: transform 0.25s var(--ease); }
.lang-btn[aria-expanded="true"] .lang-chev { transform: rotate(180deg); }

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 140px;
  list-style: none;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.3rem;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  display: none !important;
  z-index: 120;
}
.lang-menu.open { display: block !important; }
.lang-menu li { width: 100%; margin: 0; padding: 0; }
.lang-menu button {
  width: 100%;
  text-align: left;
  padding: 0.5rem 0.7rem;
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.lang-menu button:hover { color: var(--text); background: var(--surface-hover); }
.lang-menu button.active { color: var(--accent-1); font-weight: 600; }

.theme-toggle {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color 0.25s, border-color 0.25s, transform 0.25s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--accent-2); transform: translateY(-2px); }
.theme-toggle svg { width: 19px; height: 19px; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-burger span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, border-color 0.25s;
}
.btn svg { width: 17px; height: 17px; }

.btn-primary {
  background: var(--gradient);
  color: #0b1120;
  box-shadow: 0 8px 30px -10px var(--glow);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 40px -10px var(--glow); }

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}
.btn-outline:hover { transform: translateY(-3px); border-color: var(--accent-2); }

.btn-sm { padding: 0.45rem 1.1rem; font-size: 0.85rem; }
.btn-lg { padding: 1rem 2.1rem; font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

#particles {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0.55;
}

.hero-orbs { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: drift 14s ease-in-out infinite alternate;
}
.orb-1 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.35), transparent 65%);
  top: -120px; right: -80px;
}
.orb-2 {
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(129, 140, 248, 0.32), transparent 65%);
  bottom: -160px; left: -120px;
  animation-delay: -7s;
}
[data-theme="light"] .orb { opacity: 0.35; }

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-40px, 40px) scale(1.12); }
}

.hero-content { position: relative; z-index: 2; padding-block: calc(var(--nav-h) + 3rem) 5rem; }

.hero-kicker {
  font-family: var(--font-mono);
  color: var(--accent-1);
  font-size: 1rem;
  margin-bottom: 1.2rem;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7.5vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.hero-role {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2.6rem);
  font-weight: 600;
  min-height: 1.4em;
  margin-top: 0.6rem;
}

.caret {
  display: inline-block;
  width: 3px; height: 1em;
  margin-left: 4px;
  background: var(--accent-1);
  vertical-align: -0.12em;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  max-width: 620px;
  margin-top: 1.6rem;
  color: var(--text-muted);
  font-size: 1.08rem;
}
.hero-desc strong { color: var(--text); }

.hero-cta { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.4rem; }

.hero-socials { display: flex; gap: 1.1rem; margin-top: 2.6rem; }
.hero-socials a {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color 0.25s, border-color 0.25s, transform 0.25s var(--ease), box-shadow 0.25s;
}
.hero-socials a:hover {
  color: var(--accent-1);
  border-color: var(--accent-1);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px -12px var(--glow);
}
.hero-socials svg { width: 20px; height: 20px; }

.hero-scroll {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.mouse {
  display: block;
  width: 26px; height: 42px;
  border: 2px solid var(--text-muted);
  border-radius: 14px;
  position: relative;
}
.wheel {
  position: absolute;
  top: 7px; left: 50%;
  width: 4px; height: 8px;
  margin-left: -2px;
  border-radius: 4px;
  background: var(--accent-1);
  animation: wheel 1.8s ease-in-out infinite;
}
@keyframes wheel {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(12px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ---------- Sections ---------- */
.section { padding-block: 6.5rem; position: relative; }
.section-alt { background: var(--bg-alt); }

.section-head { margin-bottom: 3.2rem; }
.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-1);
  display: block;
  margin-bottom: 0.6rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.5vw, 2.7rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ---------- Sobre mí ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 3.5rem;
  align-items: start;
}

.photo-frame {
  position: relative;
  border-radius: var(--radius);
}
.photo-frame::before {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: calc(var(--radius) + 3px);
  background: var(--gradient);
  z-index: -1;
  filter: blur(1px);
}
.photo-frame::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: calc(var(--radius) + 3px);
  background: var(--gradient);
  z-index: -2;
  filter: blur(28px);
  opacity: 0.45;
}
.photo-frame img {
  border-radius: var(--radius);
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.about-text p { color: var(--text-muted); margin-bottom: 1.1rem; }
.about-text strong { color: var(--text); }

.about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.about-facts li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  transition: transform 0.25s var(--ease), border-color 0.25s;
}
.about-facts li:hover { transform: translateY(-4px); border-color: var(--accent-2); }
.fact-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
}
.fact-label { font-size: 0.82rem; color: var(--text-muted); }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 780px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 9px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-1), var(--accent-2), transparent);
  opacity: 0.5;
}

.timeline-item { position: relative; padding-left: 2.6rem; padding-bottom: 2.4rem; }
.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: 0; top: 8px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent-1);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent-1) 18%, transparent), 0 0 18px var(--glow);
}

.timeline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem;
  transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.timeline-card:hover {
  transform: translateX(6px);
  border-color: var(--accent-2);
  box-shadow: var(--shadow);
}

.timeline-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
}
.timeline-top h3 { font-family: var(--font-display); font-size: 1.2rem; }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-1);
  white-space: nowrap;
}
.timeline-org { color: var(--text-muted); font-weight: 500; margin: 0.15rem 0 0.9rem; }

.timeline-card ul:not(.courses) li {
  position: relative;
  padding-left: 1.2rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}
.timeline-card ul:not(.courses) li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent-1);
}
.timeline-card li strong { color: var(--text); }

.courses { display: grid; grid-template-columns: 1fr 1fr; gap: 0.35rem 1.5rem; }
.courses li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  border-bottom: 1px dashed var(--border);
  padding-block: 0.3rem;
}
.courses li span { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent-1); white-space: nowrap; }

.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1rem; }
.tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  color: var(--accent-2);
  border: 1px solid color-mix(in srgb, var(--accent-2) 30%, transparent);
}

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  transition: transform 0.3s var(--ease), border-color 0.3s;
}
.skill-card:hover { transform: translateY(-5px); border-color: var(--accent-1); }
.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.skill-ico { color: var(--accent-1); }

.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  font-size: 0.85rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color 0.25s, border-color 0.25s, transform 0.25s;
}
.chip:hover { color: var(--accent-1); border-color: var(--accent-1); transform: translateY(-2px); }

/* ---------- Educación ---------- */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.4rem;
}
.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.edu-card:hover { transform: translateY(-6px); border-color: var(--accent-2); box-shadow: var(--shadow); }
.edu-years {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-1);
}
.edu-card h3 { font-family: var(--font-display); font-size: 1.2rem; margin-top: 0.5rem; }
.edu-org { color: var(--text); font-weight: 500; font-size: 0.92rem; margin: 0.2rem 0 0.7rem; }
.edu-desc { color: var(--text-muted); font-size: 0.92rem; }

/* ---------- Contacto ---------- */
.contact-inner { text-align: center; max-width: 640px; }
.contact-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.2rem;
}
.contact-desc { color: var(--text-muted); margin-bottom: 2.2rem; font-size: 1.05rem; }

.contact-socials {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 2.4rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.contact-socials a { transition: color 0.25s; }
.contact-socials a:hover { color: var(--accent-1); }

/* ---------- Footer ---------- */
.footer {
  padding-block: 2.4rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.footer-sub { font-family: var(--font-mono); font-size: 0.76rem; margin-top: 0.3rem; }

/* ---------- Back to top ---------- */
.back-top {
  position: fixed;
  right: 1.4rem; bottom: 1.4rem;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s var(--ease), visibility 0.3s, color 0.25s, border-color 0.25s;
  z-index: 90;
}
.back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { color: var(--accent-1); border-color: var(--accent-1); }
.back-top svg { width: 20px; height: 20px; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--delay, 0s);
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-photo { max-width: 300px; margin-inline: auto; }
  .project-card.featured { grid-column: span 1; }
}

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

  .nav-links {
    position: fixed;
    top: var(--nav-h); right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    width: min(320px, 82vw);
    height: calc(100dvh - var(--nav-h));
    padding: 2rem 1.8rem;
    background: var(--nav-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.4s var(--ease);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-link { font-size: 1.05rem; padding-block: 0.5rem; }
  .nav-cv { margin: 0.6rem 0 0; }

  .section { padding-block: 4.5rem; }
  .courses { grid-template-columns: 1fr; }
  .hero-socials { flex-wrap: wrap; }

  .lang-menu { right: -0.4rem; min-width: 150px; }
}

@media (max-width: 420px) {
  .lang-btn .lang-current { display: none; }
  .lang-btn { padding: 0 0.5rem; }
}

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