:root {
  --bg: #f4f0e8;
  --surface: #fbf7ef;
  --ink: #171411;
  --muted: #655d54;
  --line: rgba(23, 20, 17, 0.12);
  --accent: #a33f1f;
  --accent-soft: #d97745;
  --good: #3b7f47;
  --warn: #b96d12;
  --high: #c44c2b;
  --critical: #932b2b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0)),
    radial-gradient(circle at top left, rgba(163, 63, 31, 0.12), transparent 38%),
    var(--bg);
}

img {
  max-width: 100%;
  display: block;
}

.masthead {
  padding: 3rem 1.25rem 2rem;
  border-bottom: 1px solid var(--line);
}

.masthead__inner,
.workspace {
  width: min(1160px, calc(100% - 2rem));
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.masthead h1 {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 4.6rem);
  line-height: 0.95;
  font-weight: 700;
}

.lede {
  width: min(42rem, 100%);
  margin: 1rem 0 0;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
}

.statusline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.2rem;
  margin-top: 1.5rem;
  font-size: 0.92rem;
  color: var(--muted);
}

.workspace {
  padding: 1.4rem 0 4rem;
}

.band {
  padding: 1.35rem 0 1.8rem;
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h2,
.system-readout h3,
.tool-panel h3 {
  margin: 0;
  font-size: 1.2rem;
}

.section-heading p,
.tool-panel p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.scenario-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.scenario-btn {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.5);
  color: var(--ink);
  padding: 0.9rem 1rem;
  text-align: left;
  min-height: 5.5rem;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.scenario-btn strong,
.scenario-btn span {
  display: block;
}

.scenario-btn strong {
  font-size: 1rem;
}

.scenario-btn span {
  margin-top: 0.35rem;
  color: var(--muted);
  line-height: 1.4;
  font-size: 0.92rem;
}

.scenario-btn:hover,
.scenario-btn.is-active {
  transform: translateY(-2px);
  border-color: rgba(163, 63, 31, 0.45);
  background: rgba(255,255,255,0.92);
}

.analysis-band {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(20rem, 0.85fr);
  gap: 1.4rem;
}

.frame-shell {
  overflow: hidden;
  border: 1px solid var(--line);
  background: #efe7dc;
}

.frame-shell img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.metric-ribbon {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.8rem;
}

.metric-ribbon div,
.video-summary div {
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}

.metric-ribbon span,
.video-summary span,
.readout-grid dt {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}

.metric-ribbon strong,
.video-summary strong,
.readout-grid dd {
  margin: 0.25rem 0 0;
  font-size: 1.25rem;
}

.system-readout {
  display: grid;
  gap: 1rem;
}

.readout-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
  margin: 0.8rem 0 0;
}

.readout-grid div {
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
}

.feature-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.8rem;
}

.feature-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
  font-size: 0.98rem;
}

.feature-item span {
  color: var(--muted);
}

.video-tools {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.tool-panel {
  padding: 0.25rem 0;
}

.artifact-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 1rem;
}

.artifact-list a {
  color: var(--accent);
  text-decoration: none;
  border-top: 1px solid var(--line);
  padding-top: 0.7rem;
}

.artifact-list a:hover {
  text-decoration: underline;
}

button,
input[type="file"] {
  font: inherit;
}