/* =============================================================
   Alejandro Taborda Cadavid — Senior SDET portfolio
   Archetype: sober dark, type-driven, single green accent
   =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg:        #0a0c10;
  --bg-2:      #10141b;
  --bg-3:      #161b24;
  --ink:       #f2f4f8;
  --ink-soft:  #c3c9d4;
  --mute:      #87909f;
  --accent:    #4d8dff;
  --accent-dim: rgba(77, 141, 255, 0.16);
  --line:      rgba(242, 244, 248, 0.12);

  --serif: "Instrument Serif", Georgia, serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;

  --gutter: clamp(1.25rem, 5vw, 4.5rem);
  --section-gap: clamp(5rem, 12vh, 9rem);

  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
ul { padding: 0; list-style: none; }
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; line-height: 1.05; letter-spacing: -0.01em; font-weight: 400; }
strong { font-weight: 600; color: var(--ink); }

::selection { background: var(--accent); color: var(--bg); }

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

/* =============================================================
   3. Utilities
   ============================================================= */
.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: 0.6rem 1rem; background: var(--ink); color: var(--bg);
  z-index: 9999; border-radius: 6px; font-weight: 500;
}
.skip-link:focus { top: 1rem; }

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

/* =============================================================
   4. Reveal system (JS adds .is-visible; safe without JS)
   ============================================================= */
.reveal { opacity: 1; transform: none; }
html.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}
html.js .reveal.is-visible { opacity: 1; transform: none; }

/* Defensive: split-text elements must never inherit hidden state */
.reveal[data-split] { opacity: 1; transform: none; }

/* Staggered children — JS adds .stagger-item + per-child delay, then cleans up */
html.js .stagger-item {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
html.js .stagger-item.is-visible { opacity: 1; transform: none; }

/* =============================================================
   5. Components
   ============================================================= */
.btn {
  display: inline-block;
  padding: 0.85rem 1.7rem;
  font-family: var(--mono);
  font-size: 0.86rem;
  letter-spacing: 0.05em;
  border-radius: 4px;
  border: 1px solid var(--line);
  transition: transform 0.35s var(--ease-out), background 0.35s var(--ease-out),
              color 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 500;
}
.btn-primary:hover { background: var(--ink); border-color: var(--ink); transform: translateY(-2px); }
.btn-ghost { color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-small { padding: 0.5rem 1rem; font-size: 0.78rem; }

/* =============================================================
   6. Nav
   ============================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem var(--gutter);
  background: rgba(10, 12, 16, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease-soft), background 0.4s var(--ease-soft);
}
@supports (backdrop-filter: blur(14px)) {
  .nav { backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
}
.nav.is-scrolled { border-bottom-color: var(--line); background: rgba(10, 12, 16, 0.88); }

.nav-brand {
  font-family: var(--mono);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.nav-mark { color: var(--accent); }

.nav-links { display: none; gap: 1.6rem; }
.nav-links a {
  position: relative;
  font-size: 0.86rem;
  color: var(--ink-soft);
  transition: color 0.3s var(--ease-out);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -4px;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease-out);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }

@media (min-width: 720px) {
  .nav-links { display: flex; }
}

/* =============================================================
   7. Hero
   ============================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 7rem var(--gutter) 4rem;
  text-align: center;
}

.hero-gradient {
  position: absolute; inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle 640px at var(--mx, 62%) var(--my, 30%), var(--accent-dim) 0%, transparent 62%),
    radial-gradient(circle 900px at calc(var(--mx, 62%) - 28%) calc(var(--my, 30%) + 42%), rgba(99, 102, 241, 0.10) 0%, transparent 60%),
    var(--bg);
  filter: blur(48px) saturate(120%);
}

.hero-particles {
  position: absolute; inset: 0;
  z-index: -1;
  pointer-events: none;
}

.hero-inner { max-width: 60rem; }

.hero-title {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 9vw, 7rem);
  line-height: 0.98;
  margin: 1.1rem auto 1.4rem;
  max-width: 14ch;
}

.hero-role {
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  color: var(--ink-soft);
}

.hero-stack {
  font-family: var(--mono);
  font-size: clamp(0.78rem, 1.7vw, 0.95rem);
  letter-spacing: 0.08em;
  color: var(--mute);
  margin-top: 0.7rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  margin-top: 2.4rem;
}

.hero-social {
  margin-top: 1.6rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--mute);
  display: flex;
  justify-content: center;
  gap: 0.7rem;
}
.hero-social a { color: var(--ink-soft); transition: color 0.3s var(--ease-out); }
.hero-social a:hover { color: var(--accent); }

.hero-scroll {
  position: absolute;
  bottom: 1.6rem; left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mute);
}

/* =============================================================
   8. Sections — shared
   ============================================================= */
.section {
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--section-gap) var(--gutter) 0;
}
.section:last-of-type { padding-bottom: var(--section-gap); }

.section-head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding-top: 1.4rem;
  margin-bottom: clamp(2.2rem, 6vw, 3.6rem);
}
/* Top rule draws itself in when the section head reveals */
.section-head::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 1px;
  background: var(--line);
}
html.js .section-head::before {
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1.3s var(--ease-out) 0.15s;
}
html.js .section-head.is-visible::before { transform: scaleX(1); }
.section-num {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--accent);
}
.section-head h2 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.4rem);
}

/* =============================================================
   9. About
   ============================================================= */
.about-grid {
  display: grid;
  gap: 2.5rem;
}
@media (min-width: 960px) {
  .about-grid { grid-template-columns: minmax(240px, 340px) 1fr; gap: 4rem; }
}

.about-figure img {
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 6px;
  filter: grayscale(0.2) contrast(1.04);
}

.about-lede {
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  line-height: 1.5;
  color: var(--ink);
}
.about-lede em { font-family: var(--serif); font-style: italic; font-size: 1.08em; color: var(--accent); }
.about-copy p + p { margin-top: 1.2rem; color: var(--ink-soft); }

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.8rem 1.2rem;
  margin-top: 2.6rem;
  border-top: 1px solid var(--line);
  padding-top: 1.8rem;
}
@media (min-width: 720px) {
  .stats { grid-template-columns: repeat(4, 1fr); }
}
.stat dd {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.6vw, 3rem);
  color: var(--ink);
  margin: 0;
  line-height: 1;
}
.stat dt {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 0.5rem;
}

/* =============================================================
   10. Skills
   ============================================================= */
.skills-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
@media (min-width: 540px)  { .skills-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px)  { .skills-grid { grid-template-columns: repeat(3, 1fr); } }

.skill-block {
  position: relative;
  background: var(--bg);
  padding: 1.8rem 1.6rem;
  transition: background 0.4s var(--ease-out);
}
/* Accent line sweeps across the top on hover */
.skill-block::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease-out);
}
@media (hover: hover) {
  .skill-block:hover { background: var(--bg-2); }
  .skill-block:hover::after { transform: scaleX(1); }
  .skill-block:hover li { transform: translateX(6px); color: var(--ink); }
  .skill-block:hover li:nth-child(2) { transition-delay: 0.035s; }
  .skill-block:hover li:nth-child(3) { transition-delay: 0.07s; }
  .skill-block:hover li:nth-child(4) { transition-delay: 0.105s; }
  .skill-block:hover li:nth-child(5) { transition-delay: 0.14s; }
  .skill-block:hover li:nth-child(6) { transition-delay: 0.175s; }
  .skill-block:hover li:nth-child(7) { transition-delay: 0.21s; }
}
.skill-block h3 {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1rem;
}
.skill-block li {
  font-size: 0.95rem;
  color: var(--ink-soft);
  padding: 0.28rem 0;
  border-bottom: 1px dashed rgba(242, 244, 248, 0.07);
  transition: transform 0.45s var(--ease-out), color 0.45s var(--ease-out);
}
.skill-block li:last-child { border-bottom: 0; }

/* =============================================================
   11. Experience
   ============================================================= */
.xp-row {
  border-top: 1px solid var(--line);
  padding: 2.2rem 0;
  display: grid;
  gap: 1.2rem;
  transition: background 0.5s var(--ease-out);
}
@media (hover: hover) {
  .xp-row:hover { background: linear-gradient(90deg, var(--bg-2) 0%, transparent 75%); }
  .xp-row:hover .xp-list li::before { transform: translateX(4px); }
}
@media (min-width: 960px) {
  .xp-row { grid-template-columns: minmax(240px, 340px) 1fr; gap: 4rem; }
}
.xp-row:last-child { border-bottom: 1px solid var(--line); }

.xp-head h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }
.xp-company { color: var(--accent); font-weight: 400; }
.xp-dates {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mute);
  margin-top: 0.4rem;
}

.xp-list { display: grid; gap: 0.8rem; }
.xp-list li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--ink-soft);
  font-size: 0.98rem;
}
.xp-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
  transition: transform 0.4s var(--ease-out);
}

/* =============================================================
   12. Selected Work
   ============================================================= */
.work-intro {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--ink-soft);
  max-width: 46ch;
  margin-bottom: clamp(2.2rem, 5vw, 3.4rem);
}

.work-grid { display: grid; gap: 2.2rem; }
@media (min-width: 960px) { .work-grid { grid-template-columns: repeat(3, 1fr); } }

.case {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.5s var(--ease-out), border-color 0.5s var(--ease-out);
}
@media (hover: hover) {
  .case:hover { transform: translateY(-6px); border-color: rgba(77, 141, 255, 0.45); }
  .case:hover .case-media img { transform: scale(1.05); filter: saturate(0.7) contrast(1.05); }
}

.case-media { overflow: hidden; aspect-ratio: 16 / 9; }
.case-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.35) contrast(1.02) brightness(0.85);
  transition: transform 0.7s var(--ease-out), filter 0.7s var(--ease-out);
}

.case-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 1.3rem 1.5rem 0;
}
.case h3 {
  font-family: var(--serif);
  font-size: 1.55rem;
  padding: 0.5rem 1.5rem 0;
}

.case-body { padding: 1rem 1.5rem 1.7rem; display: grid; gap: 0.35rem; }
.case-body dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
  margin-top: 0.7rem;
}
.case-body dd { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }

/* =============================================================
   13. Certifications
   ============================================================= */
.certs-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.certs-list li {
  background: var(--bg);
  padding: 1.5rem 1.7rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
@media (min-width: 720px) {
  .certs-list li { flex-direction: row; justify-content: space-between; align-items: baseline; }
}
.certs-list strong { font-size: 1.05rem; }
.certs-list span { font-family: var(--mono); font-size: 0.78rem; color: var(--mute); }

/* =============================================================
   14. Contact
   ============================================================= */
.contact { text-align: center; }
.contact .section-head { justify-content: center; }

.contact-lede { color: var(--ink-soft); max-width: 42ch; margin: 0 auto 2rem; }

.contact-email {
  display: inline-block;
  font-family: var(--serif);
  font-size: clamp(1.3rem, 4.6vw, 3.2rem);
  line-height: 1.15;
  word-break: break-word;
  position: relative;
  transition: color 0.35s var(--ease-out);
}
.contact-email::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 100%; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s var(--ease-out);
}
.contact-email:hover { color: var(--accent); }
.contact-email:hover::after { transform: scaleX(1); transform-origin: left; }

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  margin-top: 2.6rem;
}
.contact-social {
  margin-top: 1.6rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--mute);
  display: flex;
  justify-content: center;
  gap: 0.7rem;
}
.contact-social a { color: var(--ink-soft); transition: color 0.3s var(--ease-out); }
.contact-social a:hover { color: var(--accent); }

/* =============================================================
   15. Footer
   ============================================================= */
.footer {
  border-top: 1px solid var(--line);
  margin-top: var(--section-gap);
  padding: 2rem var(--gutter) 2.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 2rem;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--mute);
}
.footer-credits a { color: var(--ink-soft); border-bottom: 1px solid var(--line); transition: color 0.3s, border-color 0.3s; }
.footer-credits a:hover { color: var(--accent); border-color: var(--accent); }

/* =============================================================
   16. Credits page
   ============================================================= */
.page-credits main { max-width: 46rem; margin: 0 auto; padding: 8rem var(--gutter) 4rem; }
.page-credits h1 { font-family: var(--serif); font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 1rem; }
.credits-list { display: grid; gap: 1.1rem; margin-top: 2rem; }
.credits-list li { border-top: 1px solid var(--line); padding-top: 1.1rem; font-size: 0.92rem; color: var(--ink-soft); }
.credits-list a { color: var(--ink); border-bottom: 1px solid var(--line); }
.credits-list a:hover { color: var(--accent); border-color: var(--accent); }
.credits-back { font-family: var(--mono); font-size: 0.82rem; color: var(--mute); }
.credits-back:hover { color: var(--accent); }

/* =============================================================
   17. Reduced motion — only intrusive effects
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  .hero-gradient { filter: blur(48px); }
  .hero-particles { display: none; }
  /* Micro-interactions (hover, underline, reveals) intentionally kept. */
}

/* =============================================================
   18. Print — recruiters do print portfolios
   ============================================================= */
@media print {
  .nav, .hero-gradient, .hero-scroll, .footer-credits { display: none; }
  body { background: #fff; color: #111; }
  .hero { min-height: auto; padding: 2rem 0; }
}