/* NetFault Lab — project site.
   Dark by design: this is a systems tool, and the replay reads like a console.
   No external assets, no webfonts, no runtime dependencies. */

:root {
  --bg: #0a0e13;
  --bg-alt: #0e141b;
  --panel: #131b24;
  --panel-2: #182230;
  --line: #22303f;
  --line-soft: #1a242f;
  --text: #e8eef5;
  --muted: #94a5b6;
  --dim: #6b7c8d;
  --accent: #4dd4c4;
  --accent-dim: #2a8f85;
  --warn: #f0b429;
  --danger: #ff6b5e;
  --ok: #5fd97a;
  --info: #6ba9ff;
  --radius: 10px;
  --wrap: 1080px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto; }

a { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 0.08em 0.36em;
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; }

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

.hero {
  padding: clamp(3.5rem, 9vw, 6.5rem) 0 clamp(2.5rem, 5vw, 4rem);
  background:
    radial-gradient(1100px 420px at 12% -8%, rgba(77, 212, 196, 0.13), transparent 62%),
    radial-gradient(900px 380px at 88% 4%, rgba(107, 169, 255, 0.09), transparent 60%),
    var(--bg);
  border-bottom: 1px solid var(--line-soft);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.6rem, 7vw, 4.2rem);
  font-weight: 700;
}

.tagline {
  margin: 0.7rem 0 0;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  color: var(--text);
  font-weight: 500;
  max-width: 42ch;
}
.tagline em { color: var(--accent); font-style: normal; }

.lede {
  margin: 1.1rem 0 0;
  color: var(--muted);
  max-width: 66ch;
}

.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.9rem; }

.button {
  display: inline-block;
  padding: 0.62rem 1.15rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-weight: 550;
  font-size: 0.94rem;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s, transform 0.12s;
}
.button:hover { border-color: var(--accent-dim); background: var(--panel-2); }
.button:active { transform: translateY(1px); }
.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #052220;
}
.button.primary:hover { background: #63e3d3; border-color: #63e3d3; }

.badges {
  list-style: none;
  padding: 0;
  margin: 2.4rem 0 0;
  display: grid;
  gap: 0.6rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  font-size: 0.9rem;
  color: var(--muted);
}
.badges li { border-top: 1px solid var(--line-soft); padding-top: 0.6rem; }
.badges span {
  display: block;
  font-family: var(--mono);
  font-size: 1.35rem;
  color: var(--text);
  font-weight: 600;
}

/* ---------- sections ---------- */

.section { padding: clamp(3rem, 7vw, 5rem) 0; }
.section.alt { background: var(--bg-alt); border-block: 1px solid var(--line-soft); }

.section h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.6rem, 3.4vw, 2.15rem);
}

.section-lede { margin: 0 0 2rem; color: var(--muted); max-width: 74ch; }

/* ---------- player ---------- */

.player {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

.scenario-tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem 0.5rem 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  background: var(--bg-alt);
  scrollbar-width: thin;
}

.scenario-tabs button {
  flex: 0 0 auto;
  padding: 0.55rem 0.9rem;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 7px 7px 0 0;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 550;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}
.scenario-tabs button:hover { color: var(--text); background: var(--panel); }
.scenario-tabs button[aria-selected="true"] {
  color: var(--accent);
  background: var(--panel);
  border-color: var(--line);
  margin-bottom: -1px;
}

.scenario-summary {
  margin: 0;
  padding: 1.1rem 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--line-soft);
}

.commands {
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--dim);
  overflow-x: auto;
}
.commands .cmd { white-space: pre; }
.commands .cmd b { color: var(--accent); font-weight: 500; }

/* stage */

.stage {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.25rem;
  align-items: center;
  padding: 1.6rem 1.25rem;
}

.node {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.9rem 1rem;
  min-width: 108px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}
.node-name { font-family: var(--mono); font-size: 0.95rem; color: var(--text); }
.node-sub { font-size: 0.72rem; color: var(--dim); }

.pipes { display: grid; gap: 1rem; min-width: 0; }

.pipe-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.35rem;
  font-size: 0.78rem;
}
.pipe-label { font-family: var(--mono); color: var(--muted); }

.pause-badge {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #2a1d00;
  background: var(--warn);
  border-radius: 4px;
  padding: 0.08rem 0.4rem;
  font-weight: 700;
}

.queue {
  position: relative;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    repeating-linear-gradient(90deg, transparent 0 7px, rgba(255,255,255,0.022) 7px 8px),
    var(--bg);
  overflow: hidden;
}

.queue-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  transition: width 90ms linear, background 200ms;
}
.pipe.reverse .queue-fill { inset: 0 0 0 auto; background: linear-gradient(270deg, #2f6bb5, var(--info)); }
.queue-fill.paused { background: linear-gradient(90deg, #a8761a, var(--warn)); }
.pipe.reverse .queue-fill.paused { background: linear-gradient(270deg, #a8761a, var(--warn)); }

@media (prefers-reduced-motion: reduce) { .queue-fill { transition: none; } }

.watermark {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--dim);
  opacity: 0.65;
}
.watermark.high { background: var(--warn); opacity: 0.8; }
.watermark span {
  position: absolute;
  top: 1px;
  left: 3px;
  font-family: var(--mono);
  font-size: 0.58rem;
  color: var(--dim);
  letter-spacing: 0.03em;
}
.watermark.high span { color: var(--warn); }

.pipe-foot { margin-top: 0.3rem; font-family: var(--mono); font-size: 0.75rem; color: var(--dim); }
.pipe-foot span { color: var(--text); }

/* controls */

.controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.85rem 1.25rem;
  border-block: 1px solid var(--line-soft);
  background: var(--bg-alt);
  flex-wrap: wrap;
}

.play {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 1px solid var(--accent-dim);
  background: var(--panel-2);
  color: var(--accent);
  cursor: pointer;
  transition: background 0.15s;
}
.play:hover { background: var(--panel); }

.scrub {
  flex: 1 1 220px;
  min-width: 140px;
  accent-color: var(--accent);
  height: 4px;
  cursor: pointer;
}

.clock { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }
.clock span { color: var(--text); }

.speed { font-size: 0.78rem; color: var(--dim); display: flex; align-items: center; gap: 0.4rem; }
.speed select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.2rem 0.35rem;
  font-family: var(--mono);
  font-size: 0.76rem;
}

/* readouts */

.readouts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.readout { background: var(--panel); padding: 0.75rem 1rem; }
.readout dt { font-size: 0.68rem; color: var(--dim); text-transform: uppercase; letter-spacing: 0.06em; }
.readout dd {
  margin: 0.2rem 0 0;
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--text);
}
.readout dd.state-reset, .readout dd.state-failed { color: var(--danger); }
.readout dd.state-timed_out { color: var(--warn); }
.readout dd.state-fully_closed { color: var(--ok); }

/* log */

.log-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.9rem 1.25rem 0.5rem;
}
.log-head h3 { margin: 0; font-size: 0.95rem; font-weight: 600; }
.toggle { font-size: 0.78rem; color: var(--dim); display: flex; align-items: center; gap: 0.4rem; cursor: pointer; }
.toggle input { accent-color: var(--accent); }

.log {
  height: 220px;
  overflow-y: auto;
  margin: 0 1.25rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.7;
  scrollbar-width: thin;
}

.log-line { display: flex; gap: 0.7rem; white-space: nowrap; }
.log-line .t { color: var(--dim); flex: 0 0 auto; }
.log-line .e { flex: 0 0 auto; min-width: 15ch; }
.log-line .d { color: var(--dim); overflow: hidden; text-overflow: ellipsis; }
.log-line.is-artifact { opacity: 0.45; }
.log-line .e { color: var(--muted); }
.log-line[data-kind="pause"] .e { color: var(--warn); }
.log-line[data-kind="resume"] .e { color: var(--accent); }
.log-line[data-kind="fault"] .e { color: var(--danger); font-weight: 600; }
.log-line[data-kind="close"] .e { color: var(--info); }
.log-line[data-kind="open"] .e { color: var(--ok); }

.log-note { margin: 0.7rem 1.25rem 1.25rem; font-size: 0.76rem; color: var(--dim); max-width: 78ch; }

/* ---------- diagram ---------- */

.diagram {
  margin: 0 0 2.5rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.diagram svg { width: 100%; height: auto; display: block; }

.d-box { fill: var(--panel-2); stroke: var(--line); }
.d-panel { fill: rgba(77, 212, 196, 0.04); stroke: var(--accent-dim); stroke-dasharray: 4 4; }
.d-inner { fill: var(--bg-alt); stroke: var(--line); }
.d-inner.accent { stroke: var(--accent-dim); }
.d-inner.warn { stroke: #8a6a1c; }
.d-panel-title {
  font-family: var(--mono); font-size: 13px; fill: var(--accent);
  text-anchor: middle; letter-spacing: 0.04em;
}
.d-title { font-family: var(--mono); font-size: 14px; fill: var(--text); text-anchor: middle; }
.d-label { font-family: var(--mono); font-size: 12.5px; fill: var(--text); text-anchor: middle; }
.d-sub { font-family: var(--sans); font-size: 10.5px; fill: var(--dim); text-anchor: middle; }
.d-arrow { stroke: var(--accent-dim); stroke-width: 1.6; fill: none; marker-end: none; }
.d-arrow.rev { stroke: #3b6ea8; }

/* ---------- cards / findings / evidence ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}
.card {
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.02rem; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.93rem; }

.findings { list-style: none; counter-reset: f; padding: 0; margin: 0; display: grid; gap: 1rem; }
.findings li {
  counter-increment: f;
  position: relative;
  padding: 1.3rem 1.4rem 1.3rem 3.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.findings li::before {
  content: counter(f);
  position: absolute;
  left: 1.3rem;
  top: 1.3rem;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 6px;
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
}
.findings h3 { margin: 0; font-size: 1.06rem; }
.finding-where { margin: 0.2rem 0 0.7rem; font-size: 0.78rem; color: var(--dim); font-family: var(--mono); }
.findings p:last-child { margin: 0; color: var(--muted); font-size: 0.94rem; }

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.ev {
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.ev h3 { margin: 0 0 0.8rem; font-size: 0.95rem; color: var(--accent); }
.ev dl { margin: 0; display: grid; gap: 0.7rem; }
.ev dt { font-size: 0.74rem; color: var(--dim); text-transform: uppercase; letter-spacing: 0.05em; }
.ev dd { margin: 0.1rem 0 0; font-size: 0.9rem; color: var(--text); }
.ev dd code { font-size: 0.74rem; word-break: break-word; }

.reports { margin: 1.8rem 0 0; color: var(--muted); font-size: 0.94rem; }

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

footer {
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 0.9rem;
}
footer p { margin: 0 0 0.5rem; }
footer .fine { color: var(--dim); font-size: 0.82rem; max-width: 72ch; }

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .stage { grid-template-columns: 1fr; gap: 0.9rem; }
  .node { flex-direction: row; justify-content: space-between; align-items: baseline; }
  .log { height: 190px; }
  .log-line .d { display: none; }
}