/* ============================================================
   Lucas Arteaga — personal site
   Hand-written. No framework, no trackers, no web fonts.
   ============================================================ */

:root{
  --bg:        #080b11;
  --bg-2:      #0d121b;
  --surface:   #111826;
  --surface-2: #151d2d;
  --line:      #1e2839;
  --line-soft: #172032;

  --text:      #e8eef6;
  --muted:     #93a1b5;
  --faint:     #6b7a8f;

  --accent:    #f5b544;
  --accent-hi: #ffd98a;
  --accent-lo: #7a5a1c;
  --cyan:      #4cc9f0;
  --ok:        #3fb950;

  --radius:    14px;
  --radius-sm: 9px;
  --maxw:      1120px;

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

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

html{ scroll-behavior:smooth; scroll-padding-top:84px; -webkit-text-size-adjust:100%; }

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:clamp(15px,.55vw + 13.6px,17px);
  line-height:1.65;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* ambient background */
body::before{
  content:"";
  position:fixed; inset:0; z-index:-1; pointer-events:none;
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(245,181,68,.10), transparent 62%),
    radial-gradient(760px 520px at 8% 8%,  rgba(76,201,240,.07), transparent 60%),
    linear-gradient(180deg,var(--bg) 0%, var(--bg-2) 55%, var(--bg) 100%);
}

img,svg{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3{ margin:0; line-height:1.16; letter-spacing:-.022em; font-weight:650; }
p{ margin:0 0 1em; }
ul,ol,dl{ margin:0; padding:0; list-style:none; }

:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:5px; }

.skip{
  position:absolute; left:-999px; top:0; z-index:100;
  background:var(--accent); color:#1a1204; padding:10px 16px; font-weight:650;
}
.skip:focus{ left:12px; top:12px; }

/* language switching — both languages live in the DOM (indexable), one is shown */
[data-lang-only]{ display:none; }
html[data-lang="en"] [data-lang-only="en"],
html[data-lang="es"] [data-lang-only="es"]{ display:block; }
span[data-lang-only="en"], span[data-lang-only="es"]{ display:none; }
html[data-lang="en"] span[data-lang-only="en"],
html[data-lang="es"] span[data-lang-only="es"]{ display:inline; }
nav a[data-lang-only]{ display:none; }
html[data-lang="en"] nav a[data-lang-only="en"],
html[data-lang="es"] nav a[data-lang-only="es"]{ display:inline-block; }
dt[data-lang-only]{ display:none; }
html[data-lang="en"] dt[data-lang-only="en"],
html[data-lang="es"] dt[data-lang-only="es"]{ display:block; }
button[data-lang-only]{ display:none; }
html[data-lang="en"] button[data-lang-only="en"],
html[data-lang="es"] button[data-lang-only="es"]{ display:block; }
strong[data-lang-only]{ display:none; }
html[data-lang="en"] strong[data-lang-only="en"],
html[data-lang="es"] strong[data-lang-only="es"]{ display:inline; }
em[data-lang-only]{ display:none; }
html[data-lang="en"] em[data-lang-only="en"],
html[data-lang="es"] em[data-lang-only="es"]{ display:inline; }

/* ---------- reading progress ---------- */
.progress{
  position:fixed; top:0; left:0; height:2px; width:0;
  background:linear-gradient(90deg,var(--accent),var(--cyan));
  z-index:60; transition:width .08s linear;
}

/* ---------- top bar ---------- */
.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; gap:22px;
  padding:12px clamp(18px,4vw,40px);
  background:rgba(8,11,17,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease), background .3s var(--ease);
}
.topbar.is-stuck{ border-bottom-color:var(--line); background:rgba(8,11,17,.9); }

.brand{ display:flex; align-items:center; gap:10px; font-weight:650; letter-spacing:-.01em; }
.brand-mark{
  display:grid; place-items:center;
  width:30px; height:30px; border-radius:8px;
  background:linear-gradient(150deg,var(--accent),#c98a1e);
  color:#1a1204; font-size:.76rem; font-weight:800; letter-spacing:-.02em;
}
.brand-text{ font-size:.95rem; }

.nav{ display:flex; gap:20px; margin-left:auto; font-size:.9rem; color:var(--muted); }
.nav a{ position:relative; padding:4px 0; transition:color .2s var(--ease); }
.nav a::after{
  content:""; position:absolute; left:0; bottom:0; height:1.5px; width:0;
  background:var(--accent); transition:width .26s var(--ease);
}
.nav a:hover, .nav a.is-active{ color:var(--text); }
.nav a:hover::after, .nav a.is-active::after{ width:100%; }

.lang{ display:flex; gap:2px; padding:2px; border:1px solid var(--line); border-radius:8px; background:var(--surface); }
.lang button{
  border:0; background:transparent; color:var(--faint);
  font:inherit; font-size:.76rem; font-weight:700; letter-spacing:.04em;
  padding:5px 10px; border-radius:6px; cursor:pointer;
  transition:background .2s var(--ease), color .2s var(--ease);
}
.lang button:hover{ color:var(--text); }
.lang button.is-active{ background:var(--accent); color:#1a1204; }

/* ---------- hero ---------- */
.hero{ padding:clamp(46px,8vw,104px) clamp(18px,4vw,40px) clamp(30px,5vw,60px); max-width:var(--maxw); margin:0 auto; }
.hero-grid{
  display:grid; grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);
  gap:clamp(28px,4.5vw,64px); align-items:center;
}

.eyebrow{
  font-family:var(--mono); font-size:.75rem; letter-spacing:.09em; text-transform:uppercase;
  color:var(--accent); margin:0 0 14px;
}
.hero h1{
  font-size:clamp(2.6rem,6.2vw,4.4rem); font-weight:700; letter-spacing:-.04em; margin-bottom:14px;
  background:linear-gradient(170deg,#fff 12%, #cdd8e6 62%, #8ea0b6 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.role{ color:var(--text); font-weight:600; font-size:1.02rem; margin-bottom:20px; max-width:44ch; }

.creed{
  margin:0 0 20px; padding:14px 0 14px 18px;
  border-left:2px solid var(--accent);
  color:var(--accent-hi); font-size:1.06rem; font-style:italic; max-width:46ch;
}
.lede{ color:var(--muted); max-width:52ch; }

.cta{ display:flex; flex-wrap:wrap; gap:10px; margin-top:26px; }
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:11px 19px; border-radius:var(--radius-sm);
  border:1px solid var(--line); background:var(--surface);
  color:var(--text); font-size:.92rem; font-weight:600;
  transition:transform .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.btn:hover{ transform:translateY(-2px); border-color:var(--accent-lo); background:var(--surface-2); }
.btn-primary{ background:var(--accent); border-color:var(--accent); color:#1a1204; }
.btn-primary:hover{ background:var(--accent-hi); border-color:var(--accent-hi); }

/* ---------- hero visualisation ---------- */
.hero-viz{ position:relative; }
.decline{
  width:100%; height:auto; overflow:visible;
  filter:drop-shadow(0 24px 44px rgba(245,181,68,.13));
}
.decline .grid line{ stroke:var(--line-soft); stroke-width:1; }
.decline .area{ opacity:0; animation:fadeIn 1.4s var(--ease) .7s forwards; }

.decline .line{ stroke-dasharray:1000; stroke-dashoffset:1000; }
.decline .l1{ animation:draw 2.3s var(--ease) .25s forwards; }
.decline .l2{ animation:draw 2.3s var(--ease) .5s forwards; }

.decline .dot{
  offset-path:path("M40 62 C 92 78, 128 120, 172 152 C 216 182, 258 202, 310 216 C 344 225, 372 231, 400 235");
  offset-distance:0%;
  opacity:0;
  animation:travel 5.2s linear 2.4s infinite, fadeIn .6s linear 2.4s forwards;
}

@keyframes draw{ to{ stroke-dashoffset:0; } }
@keyframes fadeIn{ to{ opacity:1; } }
@keyframes travel{ to{ offset-distance:100%; } }

.viz-legend{
  display:flex; gap:18px; justify-content:center; margin-top:12px;
  font-family:var(--mono); font-size:.72rem; letter-spacing:.05em; text-transform:uppercase; color:var(--faint);
}
.viz-legend span{ display:inline-flex; align-items:center; gap:7px; }
.sw{ width:16px; height:2px; border-radius:2px; }
.sw-a{ background:var(--accent); }
.sw-b{ background:var(--cyan); }
.viz-note{ text-align:center; color:var(--faint); font-size:.8rem; margin:10px 0 0; }

/* ---------- metrics ---------- */
.metrics{
  max-width:var(--maxw); margin:0 auto;
  padding:clamp(20px,3vw,30px) clamp(18px,4vw,40px);
  display:grid; grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px; background:var(--line-soft);
  border-block:1px solid var(--line-soft);
}
.metric{ background:var(--bg); padding:22px 20px; }
.metric .num{
  display:block; font-family:var(--mono); font-weight:700;
  font-size:clamp(1.6rem,3.2vw,2.3rem); letter-spacing:-.03em; color:var(--accent);
  font-variant-numeric:tabular-nums;
}
.metric .lbl{ display:block; margin-top:6px; color:var(--muted); font-size:.84rem; line-height:1.4; }

/* ---------- generic section ---------- */
.section{
  max-width:var(--maxw); margin:0 auto;
  padding:clamp(50px,7vw,88px) clamp(18px,4vw,40px);
}
.section h2{
  font-size:clamp(1.6rem,3.4vw,2.3rem); margin-bottom:14px;
  padding-bottom:14px; border-bottom:1px solid var(--line-soft);
}
.section-lede{ color:var(--muted); max-width:64ch; }

/* ---------- cards ---------- */
.cards{ display:grid; grid-template-columns:repeat(auto-fit,minmax(258px,1fr)); gap:16px; margin-top:30px; }
.card{
  padding:22px; border-radius:var(--radius);
  background:linear-gradient(168deg,var(--surface) 0%, var(--bg-2) 100%);
  border:1px solid var(--line);
  transition:transform .22s var(--ease), border-color .22s var(--ease);
}
.card:hover{ transform:translateY(-3px); border-color:var(--accent-lo); }
.card h3{ font-size:1.03rem; margin-bottom:9px; color:var(--accent-hi); }
.card p{ margin:0; color:var(--muted); font-size:.92rem; }

/* ---------- work features ---------- */
.feature{
  margin-top:26px; padding:clamp(22px,3vw,32px); border-radius:var(--radius);
  background:linear-gradient(168deg,var(--surface) 0%, var(--bg-2) 100%);
  border:1px solid var(--line);
  transition:border-color .25s var(--ease);
}
.feature:hover{ border-color:var(--accent-lo); }
.feature.is-progress{ border-style:dashed; }
.feature-head{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:14px; }
.feature h3{ font-size:clamp(1.15rem,2.3vw,1.5rem); margin-bottom:14px; }
.feature h3 a{ border-bottom:1px solid var(--accent-lo); transition:border-color .2s var(--ease), color .2s var(--ease); }
.feature h3 a:hover{ color:var(--accent-hi); border-color:var(--accent); }
.feature p{ color:var(--muted); font-size:.94rem; }
.feature .highlight{
  padding:16px 18px; border-radius:var(--radius-sm);
  background:rgba(245,181,68,.06); border-left:2px solid var(--accent); color:var(--text);
}
.feature .note{
  font-size:.88rem; padding:14px 16px; border-radius:var(--radius-sm);
  background:rgba(76,201,240,.05); border-left:2px solid var(--cyan);
}
.stack{ font-family:var(--mono); font-size:.78rem; color:var(--faint); margin:0; letter-spacing:.02em; }

.badge{
  font-family:var(--mono); font-size:.68rem; letter-spacing:.07em; text-transform:uppercase;
  padding:5px 10px; border-radius:999px; border:1px solid var(--line);
  color:var(--muted); background:var(--bg); white-space:nowrap;
}
.badge-gold{ border-color:var(--accent-lo); color:var(--accent); background:rgba(245,181,68,.08); }
.badge-live{ border-color:rgba(63,185,80,.4); color:var(--ok); background:rgba(63,185,80,.08); }

.specs{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(132px,1fr));
  gap:1px; background:var(--line-soft); margin:20px 0;
  border:1px solid var(--line-soft); border-radius:var(--radius-sm); overflow:hidden;
}
.specs > div{ background:var(--bg); padding:13px 15px; }
.specs dt{
  font-family:var(--mono); font-size:.66rem; letter-spacing:.08em; text-transform:uppercase;
  color:var(--faint); margin-bottom:5px;
}
.specs dd{ margin:0; font-weight:650; font-size:.92rem; font-variant-numeric:tabular-nums; }

/* ---------- certifications ---------- */
.certs{ margin-top:26px; border-top:1px solid var(--line-soft); }
.certs li{
  display:grid; grid-template-columns:74px minmax(0,1fr); gap:18px; align-items:baseline;
  padding:15px 4px; border-bottom:1px solid var(--line-soft);
  transition:background .2s var(--ease), padding-left .2s var(--ease);
}
.certs li:hover{ background:var(--surface); padding-left:12px; }
.c-hours{
  font-family:var(--mono); font-weight:700; color:var(--accent);
  font-size:.9rem; font-variant-numeric:tabular-nums;
}
.c-body{ color:var(--muted); font-size:.92rem; }
.c-body strong{ color:var(--text); font-weight:650; }
.c-ok{ color:var(--ok); font-family:var(--mono); font-size:.76rem; }
.c-gold{ color:var(--accent); font-weight:650; }

/* ---------- principles ---------- */
.principles{ counter-reset:p; margin-top:26px; display:grid; gap:14px; }
.principles li{
  counter-increment:p; position:relative;
  padding:20px 22px 20px 64px; border-radius:var(--radius);
  background:var(--surface); border:1px solid var(--line);
  transition:border-color .22s var(--ease), transform .22s var(--ease);
}
.principles li:hover{ border-color:var(--accent-lo); transform:translateX(3px); }
.principles li::before{
  content:counter(p,decimal-leading-zero);
  position:absolute; left:20px; top:20px;
  font-family:var(--mono); font-size:1.15rem; font-weight:700; color:var(--accent-lo);
}
.principles h3{ font-size:1rem; margin-bottom:7px; }
.principles p{ margin:0; color:var(--muted); font-size:.92rem; }

/* ---------- contact + footer ---------- */
.section-contact{ text-align:left; }
.footer{
  max-width:var(--maxw); margin:0 auto;
  padding:34px clamp(18px,4vw,40px) 54px;
  border-top:1px solid var(--line-soft);
  color:var(--faint); font-size:.84rem;
}
.footer p{ margin:0 0 4px; }
.footer-note{ color:#4d596b; font-size:.78rem; }

/* ---------- reveal on scroll (added by JS; no-JS = visible) ---------- */
.reveal{ opacity:0; transform:translateY(16px); }
.reveal.is-visible{
  opacity:1; transform:none;
  transition:opacity .6s var(--ease), transform .6s var(--ease);
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-viz{ order:-1; max-width:430px; margin:0 auto; }
  .metrics{ grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (max-width:720px){
  html{ scroll-padding-top:74px; }
  .topbar{ gap:12px; padding:10px 16px; }
  .brand-text{ display:none; }
  .nav{ gap:14px; font-size:.84rem; }
  .nav a:nth-child(n+5){ display:none !important; }
  .certs li{ grid-template-columns:60px minmax(0,1fr); gap:12px; }
}
@media (max-width:420px){
  .metrics{ grid-template-columns:1fr; }
  .nav{ display:none; }
}

/* ---------- accessibility ---------- */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important; animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{ opacity:1; transform:none; }
  .decline .line{ stroke-dashoffset:0; }
  .decline .area{ opacity:1; }
  .decline .dot{ opacity:1; }
}
@media print{
  body::before,.topbar,.progress,.cta{ display:none; }
  body{ background:#fff; color:#000; }
}