/* ============================================================
   RTT/1 — Core Stylesheet
   File: assets/css/rtt1.css
   Session: rtt=1 | coherence=declared | drift=bounded
   ============================================================ */

/* Root theme ------------------------------------------------ */

:root {
  --rtt-bg: #0b1020;
  --rtt-bg-alt: #1c2331;
  --rtt-surface: #111827;

  --rtt-border: #374151;
  --rtt-border-soft: #4b5563;

  --rtt-text: #e5e7eb;
  --rtt-text-soft: #9ca3af;
  --rtt-text-muted: #6b7280;

  --rtt-accent: #3b82f6;
  --rtt-accent-soft: #60a5fa;
  --rtt-accent-strong: #2563eb;

  --rtt-success: #22c55e;
  --rtt-warning: #facc15;
  --rtt-error: #ef4444;

  --rtt-radius-sm: 4px;
  --rtt-radius-md: 8px;
  --rtt-radius-lg: 12px;

  --rtt-shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.35);
  --rtt-shadow-hard: 0 18px 40px rgba(0, 0, 0, 0.55);

  --rtt-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

/* Global ---------------------------------------------------- */

body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at top, #111827 0, #020617 55%, #000 100%);
  color: var(--rtt-text);
  font-family: var(--rtt-font-sans);
}

/* Layout shell ---------------------------------------------- */

.rtt-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: transparent;
}

.rtt-shell__header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--rtt-border-soft);
  background: linear-gradient(90deg, #020617, #0b1020 40%, #020617 100%);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.rtt-shell__title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--rtt-text-soft);
}

.rtt-shell__session {
  font-size: 12px;
  color: var(--rtt-text-muted);
}

/* Main content ---------------------------------------------- */

.rtt-shell__main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr);
  gap: 16px;
  padding: 16px 24px 24px;
}

/* Panels ---------------------------------------------------- */

.rtt-panel {
  background: radial-gradient(circle at top left, #111827 0, #020617 60%);
  border-radius: var(--rtt-radius-md);
  border: 1px solid var(--rtt-border);
  box-shadow: var(--rtt-shadow-soft);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rtt-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.rtt-panel__title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rtt-text-soft);
}

.rtt-panel__badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--rtt-border-soft);
  color: var(--rtt-text-muted);
}

/* Snapshot grid --------------------------------------------- */

.rtt-snapshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.rtt-snapshot-card {
  background: linear-gradient(135deg, #020617, #111827);
  border-radius: var(--rtt-radius-md);
  border: 1px solid var(--rtt-border-soft);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rtt-snapshot-card__name {
  font-size: 12px;
  font-weight: 600;
  color: var(--rtt-text);
}

.rtt-snapshot-card__file {
  font-size: 11px;
  color: var(--rtt-text-muted);
}

.rtt-snapshot-card__status {
  margin-top: 4px;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.rtt-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--rtt-success);
}

/* Diff viewer ----------------------------------------------- */

.rtt-diff {
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 11px;
  line-height: 1.5;
  background: #020617;
  border-radius: var(--rtt-radius-md);
  border: 1px solid #1f2937;
  padding: 10px 12px;
  overflow: auto;
}

.rtt-diff__line {
  white-space: pre;
}

.rtt-diff__line--add {
  color: #bbf7d0;
}

.rtt-diff__line--remove {
  color: #fecaca;
}

.rtt-diff__line--same {
  color: #9ca3af;
}

/* Session chips --------------------------------------------- */

.rtt-session-chips {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
}

.rtt-chip {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--rtt-border-soft);
  background: rgba(15, 23, 42, 0.8);
  color: var(--rtt-text-muted);
}

/* Footer ---------------------------------------------------- */

.rtt-shell__footer {
  padding: 10px 24px 16px;
  border-top: 1px solid var(--rtt-border-soft);
  font-size: 11px;
  color: var(--rtt-text-muted);
  display: flex;
  justify-content: space-between;
}

/* Responsive ------------------------------------------------ */

@media (max-width: 900px) {
  .rtt-shell__main {
    grid-template-columns: minmax(0, 1fr);
  }
}