/* ============================================================
   Server Rack — Tomas Castellano
   ============================================================ */

:root {
  /* ground — tinted near-black, never pure #000 */
  --bg: #0a0c0e;
  --bg-rack: #0e1114;
  --metal: #161b20;
  --metal-2: #1e252c;
  --metal-3: #2a323b;
  --edge: #2e363f;

  /* text */
  --text: #e7eaee;
  --text-dim: #8b949d;
  --text-faint: #5b646d;

  /* LEDs — status colors only */
  --led-green: #34d17a;
  --led-amber: #f5a623;
  --led-red: #f04b4b;

  /* cables — controlled secondary */
  --cable-blue: #4f7cff;
  --cable-orange: #ff7a45;

  /* type */
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --grotesk: "Outfit", system-ui, -apple-system, sans-serif;

  /* motion */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);

  --radius: 6px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--grotesk);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--mono); }

a { color: inherit; text-decoration: none; }

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

/* ============ LED ============ */
.led {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #232a30;
  box-shadow: inset 0 1px 1px rgba(0,0,0,0.5);
  transition: background 160ms var(--ease-out), box-shadow 160ms var(--ease-out);
  flex: none;
}
.led--green.is-on,
.led.is-on.led--green { background: var(--led-green); box-shadow: 0 0 8px var(--led-green); }
.led--amber.is-on { background: var(--led-amber); box-shadow: 0 0 8px var(--led-amber); }
.led--red.is-on { background: var(--led-red); box-shadow: 0 0 8px var(--led-red); }

/* ============ TOPBAR ============ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(20px, 4vw, 48px);
  background: rgba(10, 12, 14, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--edge);
}
.topbar__brand {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--text);
}
.topbar__nav { display: flex; gap: 22px; }
.topbar__nav a {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  transition: color 160ms var(--ease-out);
}
.topbar__nav a:hover { color: var(--led-green); }
.topbar__links { display: flex; gap: 16px; }
.topbar__links a {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  transition: color 160ms var(--ease-out);
}
.topbar__links a:hover { color: var(--text); }
/* Social icons (topbar) */
.topbar__links .tlink {
  display: inline-flex;
  align-items: center;
  color: var(--text-dim);
  transition: color 160ms var(--ease-out);
}
.topbar__links .tlink:hover { color: var(--led-green); }
.topbar__links .tlink svg { width: 18px; height: 18px; fill: currentColor; display: block; }

/* ============ HERO ============ */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 72px);
  align-items: center;
  min-height: 100dvh;
  padding: clamp(40px, 6vw, 80px) clamp(20px, 5vw, 64px);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(52, 209, 122, 0.06), transparent 60%),
    var(--bg);
}
.hero__inner { max-width: 560px; }
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  margin-bottom: 24px;
}
.hero__title {
  font-size: clamp(44px, 8vw, 96px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.hero__role {
  margin-top: 18px;
  font-size: clamp(14px, 1.6vw, 18px);
  letter-spacing: 0.22em;
  color: var(--led-green);
}
.hero__sub {
  margin-top: 14px;
  max-width: 42ch;
  color: var(--text-dim);
  font-size: clamp(15px, 1.6vw, 17px);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--grotesk);
  font-weight: 500;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 160ms var(--ease-out), background 160ms var(--ease-out), border-color 160ms var(--ease-out), color 160ms var(--ease-out);
}
.btn:active { transform: scale(0.97); }
.btn--primary {
  background: var(--led-green);
  color: #06120b;
}
.btn--primary:hover { background: #46e08a; }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--edge);
}
.btn--ghost:hover { border-color: var(--text-dim); }

/* ============ RACK (frame) ============ */
.rack {
  position: relative;
  background: var(--bg-rack);
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: clamp(18px, 3vw, 32px);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.03) inset,
    0 30px 60px -30px rgba(0,0,0,0.8);
}
.rack::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 10px;
  pointer-events: none;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 6px,
    rgba(255,255,255,0.012) 6px 7px
  );
}
.rack__rail {
  position: absolute;
  top: 10px;
  bottom: 10px;
  width: 14px;
  border: 1px solid var(--edge);
  background: var(--metal);
}
.rack__rail--left { left: 10px; border-radius: 6px 0 0 6px; }
.rack__rail--right { right: 10px; border-radius: 0 6px 6px 0; }
.rack__rail::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--metal-3) 0 8px,
    transparent 8px 20px
  );
}
.rack__units {
  position: relative;
  display: grid;
  gap: 12px;
}

/* ============ UNIT ============ */
.unit {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  background: linear-gradient(180deg, var(--metal-2), var(--metal));
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.unit__leds { display: flex; flex-direction: column; gap: 6px; }
.unit__body { min-width: 0; }
.unit__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.unit__title {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.unit__title--dim { color: var(--text-faint); }
.unit__meta { font-size: 12px; color: var(--text-faint); letter-spacing: 0.06em; }
.unit__desc { margin-top: 6px; color: var(--text-dim); font-size: 15px; max-width: 60ch; }

/* fan */
.unit__fan { display: flex; align-items: center; justify-content: center; }
.fan {
  display: inline-block;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid var(--metal-3);
  position: relative;
}
.fan::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    var(--metal-3) 0 40deg, transparent 40deg 120deg,
    var(--metal-3) 120deg 160deg, transparent 160deg 240deg,
    var(--metal-3) 240deg 280deg, transparent 280deg 360deg
  );
}

/* project spec sheet */
.unit__spec {
  display: grid;
  grid-template-rows: 1fr;
  margin-top: 14px;
  transition: grid-template-rows 320ms var(--ease-out), opacity 220ms var(--ease-out);
}
.unit__spec-inner {
  overflow: hidden;
  min-height: 0;
}
.spec {
  display: grid;
  gap: 6px;
  border-top: 1px solid var(--edge);
  padding-top: 12px;
}
.spec__row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  font-size: 13px;
}
.spec__row dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  text-transform: uppercase;
  padding-top: 2px;
}
.spec__row dd { color: var(--text-dim); display: flex; align-items: center; gap: 8px; }
.spec__row dd a { color: var(--led-green); }
.spec__row dd a:hover { text-decoration: underline; }

/* empty slot */
.unit--empty { opacity: 0.55; }
.unit--empty .led { background: #1b2126; }

/* hover reveal (desktop only) */
@media (hover: hover) and (pointer: fine) {
  .unit--project .unit__spec {
    grid-template-rows: 0fr;
    opacity: 0;
  }
  .unit--project:hover .unit__spec,
  .unit--project:focus-within .unit__spec {
    grid-template-rows: 1fr;
    opacity: 1;
  }
  .unit--project:hover .led--green,
  .unit--project:focus-within .led--green { background: var(--led-green); box-shadow: 0 0 8px var(--led-green); }
  .unit--project:hover .led--amber,
  .unit--project:focus-within .led--amber { background: var(--led-amber); box-shadow: 0 0 8px var(--led-amber); }
}

/* ============ POWER BUS ============ */
.power-bus {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: var(--bg-rack);
  max-width: 720px;
  margin-bottom: 28px;
}
.power-bus__label {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}
.power-bus__leds { display: flex; gap: 6px; flex: 1; justify-content: center; }

/* ============ SECTIONS ============ */
.section {
  padding: clamp(64px, 9vw, 120px) clamp(20px, 5vw, 64px);
  max-width: 1180px;
  margin: 0 auto;
}
.section__title {
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.section__title .mono {
  font-size: 0.45em;
  letter-spacing: 0.14em;
  color: var(--text-faint);
  vertical-align: middle;
}

/* ============ ABOUT ============ */
.about { margin-top: 8px; }
.about__lead {
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.4;
  color: var(--text);
  max-width: 30ch;
}
.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  list-style: none;
}
.stack__item {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  padding: 8px 14px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: var(--bg-rack);
}

/* ============ CONSOLE ============ */
.console {
  margin-top: 8px;
  border: 1px solid var(--edge);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-rack);
}
.console__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--edge);
  background: var(--metal);
}
.console__dot { width: 11px; height: 11px; border-radius: 50%; }
.console__dot--red { background: var(--led-red); }
.console__dot--amber { background: var(--led-amber); }
.console__dot--green { background: var(--led-green); }
.console__title {
  margin-left: 10px;
  font-size: 12px;
  color: var(--text-faint);
}
.console__body {
  padding: 20px 22px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-dim);
}
.console__body .prompt { color: var(--led-green); margin-right: 10px; }
.console__out { color: var(--text); }
.console__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 22px;
  border-top: 1px solid var(--edge);
}

/* ============ FOOTER ============ */
.footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 28px clamp(20px, 5vw, 64px);
  border-top: 1px solid var(--edge);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 96px; }
  .rack--hero { order: 2; }
  .hero__inner { order: 1; }
  .topbar__nav { display: none; }
  .spec__row { grid-template-columns: 1fr; gap: 4px; }
  .spec__row dd { padding-left: 0; }
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .fan::after { animation: none !important; }
  .unit--project .unit__spec {
    opacity: 1 !important;
    grid-template-rows: 1fr !important;
  }
}