/* ============================================================
   sang-systems.com — site stylesheet
   Visual system: substation instrument panel.
   Dark graphite panels, engineering-drawing paper, IEC signal
   colours (red = live/closed, green = isolated/open).
   ============================================================ */

:root {
  --ink:      #0E1519;
  --panel:    #16212A;
  --panel-2:  #1E2C36;
  --panel-3:  #2A3B47;

  --paper:    #F0F2EF;
  --paper-2:  #E4E8E3;
  --rule:     #C6CEC8;

  --text:     #162026;
  --muted:    #5B6970;
  --muted-lt: #98A6AB;

  --live:     #C7362B;   /* energised / closed / available   */
  --safe:     #2E7D53;   /* isolated / open / in development */
  --wire:     #7E8C93;

  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body:    "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono:    "IBM Plex Mono", "Consolas", monospace;

  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --maxw: 1180px;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }

a { color: var(--text); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--live); }

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

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- type ---------- */

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0 0 .5em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.4rem, 6.2vw, 4.4rem); text-transform: uppercase; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); letter-spacing: -0.01em; }

p { margin: 0 0 1.1em; }
p.lead { font-size: clamp(1.1rem, 1.6vw, 1.3rem); line-height: 1.55; }

.eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: .7rem;
}
.eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}
.panel .eyebrow { color: var(--muted-lt); }
.panel .eyebrow::after { background: var(--panel-3); }

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

/* ---------- header ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid var(--panel-3);
}
.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 56px;
}
.brand {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: .6rem;
  white-space: nowrap;
}
.brand:hover { color: var(--paper); }
.brand__dot {
  width: 8px; height: 8px;
  background: var(--live);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(199,54,43,.22);
}
.brand em { font-style: normal; color: var(--muted-lt); }

.nav { display: flex; gap: clamp(.9rem, 2vw, 1.8rem); }
.nav a {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted-lt);
  text-decoration: none;
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--paper); }
.nav a[aria-current="page"] { color: var(--paper); border-bottom-color: var(--live); }

/* ---------- dark panel sections ---------- */

.panel {
  background: var(--panel);
  color: var(--paper);
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 44px 44px;
}
.panel h1, .panel h2, .panel h3 { color: var(--paper); }
.panel a { color: var(--paper); }

/* ---------- hero ---------- */

.hero { padding: clamp(3rem, 8vw, 6rem) 0 clamp(2.5rem, 6vw, 4.5rem); }
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
@media (max-width: 860px) {
  .hero__grid { grid-template-columns: 1fr; }
}
.hero h1 { margin-bottom: .35em; }
.hero__role {
  font-family: var(--mono);
  font-size: clamp(.8rem, 1.4vw, .95rem);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--live);
  margin: 0 0 1.4rem;
}
.hero p { color: #C8D2D6; max-width: 46ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.8rem; }

/* single-line diagram */
.sld { width: 100%; height: auto; }
.sld .bus { stroke: var(--live); stroke-width: 4; }
.sld .drop { stroke: var(--wire); stroke-width: 2; }
.sld .sym  { stroke: var(--wire); stroke-width: 2; fill: none; }
.sld .cb   { fill: var(--live); stroke: var(--live); stroke-width: 2; }
.sld .lbl  {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  fill: var(--muted-lt);
  text-transform: uppercase;
}
.sld .tag {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .08em;
  fill: #6E8089;
}
.sld a:hover .lbl { fill: var(--paper); }
.sld a:hover .cb  { fill: var(--paper); stroke: var(--paper); }

@media (prefers-reduced-motion: no-preference) {
  .sld .bus {
    stroke-dasharray: 620;
    stroke-dashoffset: 620;
    animation: energise 1.1s cubic-bezier(.4,0,.2,1) .2s forwards;
  }
  .sld .feeder { opacity: 0; animation: drop-in .5s ease-out forwards; }
  .sld .feeder:nth-of-type(1) { animation-delay: .95s; }
  .sld .feeder:nth-of-type(2) { animation-delay: 1.1s; }
  .sld .feeder:nth-of-type(3) { animation-delay: 1.25s; }
  .sld .feeder:nth-of-type(4) { animation-delay: 1.4s; }
}
@keyframes energise { to { stroke-dashoffset: 0; } }
@keyframes drop-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .8rem 1.3rem;
  border: 1px solid var(--live);
  background: var(--live);
  color: #fff;
  text-decoration: none;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.btn:hover { background: #A72A21; border-color: #A72A21; color: #fff; }
.btn--ghost {
  background: transparent;
  border-color: var(--panel-3);
  color: var(--paper);
}
.btn--ghost:hover { background: var(--panel-2); border-color: var(--muted-lt); color: var(--paper); }
.btn--dark {
  background: var(--ink); border-color: var(--ink); color: var(--paper);
}
.btn--dark:hover { background: var(--panel-2); border-color: var(--panel-2); color: var(--paper); }
.btn[aria-disabled="true"] {
  background: transparent; border-color: var(--rule); color: var(--muted);
  pointer-events: none;
}

/* ---------- generic section ---------- */

.section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.section + .section { border-top: 1px solid var(--rule); }
.panel.section + .panel.section { border-top-color: var(--panel-3); }

.section__head { max-width: 62ch; margin-bottom: clamp(2rem, 4vw, 3rem); }

/* ---------- register (project / experience table) ---------- */

.register { width: 100%; border-collapse: collapse; font-size: .95rem; }
.register caption { text-align: left; }
.register th {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  text-align: left;
  padding: 0 1rem .6rem 0;
  border-bottom: 1px solid var(--rule);
}
.register td {
  padding: .85rem 1rem .85rem 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.register td:first-child {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--live);
  white-space: nowrap;
  letter-spacing: .04em;
}
.register td:last-child { padding-right: 0; }
.register tr:hover td { background: var(--paper-2); }

/* ---------- cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr));
  gap: 1.25rem;
}

.card {
  border: 1px solid var(--rule);
  background: #fff;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  text-decoration: none;
  color: inherit;
  transition: border-color .18s ease, transform .18s ease;
}
a.card:hover { border-color: var(--live); transform: translateY(-2px); color: inherit; }
.card h3 { margin: 0; }
.card p { margin: 0; color: var(--muted); font-size: .96rem; }
.card__foot {
  margin-top: auto;
  padding-top: .9rem;
  border-top: 1px solid var(--paper-2);
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: .75rem;
}

/* status glyph: closed breaker = available, open breaker = in development */
.status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.status svg { flex: none; }
.status--available { color: var(--live); }
.status--development { color: var(--safe); }
.status--planned { color: var(--muted); }

/* ---------- skills / strengths ---------- */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
}

.deflist { margin: 0; }
.deflist dt {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--live);
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  margin-bottom: .4rem;
}
.deflist dd { margin: 0 0 1.4rem; }
.panel .deflist dt { border-top-color: var(--panel-3); }

.tags { display: flex; flex-wrap: wrap; gap: .45rem; padding: 0; margin: 0; list-style: none; }
.tags li {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .06em;
  padding: .35rem .65rem;
  border: 1px solid var(--rule);
  color: var(--muted);
  background: #fff;
}
.panel .tags li { border-color: var(--panel-3); color: #C8D2D6; background: transparent; }

/* ---------- product page ---------- */

.product__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}
@media (max-width: 860px) { .product__head { grid-template-columns: 1fr; } }

.spec {
  border: 1px solid var(--panel-3);
  padding: 1.4rem;
  font-family: var(--mono);
  font-size: .8rem;
}
.spec dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: .55rem 1rem; }
.spec dt { color: var(--muted-lt); letter-spacing: .08em; text-transform: uppercase; font-size: .68rem; padding-top: .15rem; }
.spec dd { margin: 0; color: var(--paper); overflow-wrap: anywhere; }

.shots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 1.25rem;
}
.shot { margin: 0; border: 1px solid var(--rule); background: #fff; }
.shot img { display: block; width: 100%; }
.shot figcaption {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--muted);
  padding: .7rem .9rem;
  border-top: 1px solid var(--paper-2);
}

.changelog { list-style: none; padding: 0; margin: 0; }
.changelog li { padding: 1rem 0; border-top: 1px solid var(--rule); }
.changelog .ver {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--live);
  margin-right: .8rem;
}
.changelog .date { font-family: var(--mono); font-size: .72rem; color: var(--muted); }

.notice {
  border-left: 3px solid var(--live);
  background: var(--paper-2);
  padding: 1.1rem 1.3rem;
  font-size: .96rem;
}
.notice strong { font-family: var(--display); text-transform: uppercase; letter-spacing: .02em; font-size: .9rem; }
.panel .notice { background: var(--panel-2); border-left-color: var(--live); }

/* ---------- steps ---------- */

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.steps li {
  counter-increment: step;
  padding: 1rem 0 1rem 3.2rem;
  border-top: 1px solid var(--rule);
  position: relative;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.05rem;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--live);
  letter-spacing: .06em;
}

/* ---------- footer ---------- */

.foot {
  background: var(--ink);
  color: var(--muted-lt);
  padding: clamp(2.5rem, 5vw, 3.5rem) 0 2rem;
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .03em;
}
.foot a { color: var(--paper); text-decoration: none; }
.foot a:hover { color: var(--live); }
.foot__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--panel-3);
}
.foot__grid h4 {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: .9rem;
}
.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.foot__base { padding-top: 1.5rem; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; font-size: .72rem; }

/* ---------- utilities ---------- */

.skip {
  position: absolute; left: -9999px;
  background: var(--live); color: #fff; padding: .7rem 1rem;
  font-family: var(--mono); font-size: .78rem;
}
.skip:focus { left: 1rem; top: .5rem; z-index: 100; }

.muted { color: var(--muted); }
.center { text-align: center; }
.stack > * + * { margin-top: 1rem; }
[hidden] { display: none !important; }