:root {
  --bg: #0f1117;
  --card: #1b1f2a;
  --fg: #e6e8ee;
  --muted: #9aa3b2;
  --accent: #ff9900;
  --accent-2: #2f6fed;
  --ok: #2ecc71;
  --err: #e74c3c;
  --warn: #f1c40f;
  --managed: #8e7cff;
  --active: #38bdf8;
  --border: #2a2f3d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

header {
  padding: 2rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
}

h1 { margin: 0; font-size: 1.6rem; }
.subtitle { margin: 0.25rem 0 0; color: var(--muted); }

/* Responsive two-column layout: left operations+transcript, right graph+token. */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
  align-items: start;
}

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

.col { display: grid; gap: 1.25rem; align-content: start; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.card h2 { margin-top: 0; font-size: 1.1rem; }

.hint, .status { color: var(--muted); font-size: 0.9rem; }

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 0.75rem 0;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #1a1a1a;
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-size: 0.95rem;
}

.btn.secondary { background: var(--accent-2); color: #fff; }
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.search { margin-top: 1rem; display: grid; gap: 0.5rem; }
.search label { font-size: 0.9rem; color: var(--muted); }

input[type="text"] {
  background: #12151d;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  padding: 0.55rem 0.75rem;
  font-size: 0.95rem;
}

pre {
  background: #12151d;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 400px;
}

code {
  background: #12151d;
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-size: 0.85em;
}

/* ---- Transcript ---- */
#transcript {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--fg);
  font-size: 0.9rem;
  max-height: 360px;
  overflow-y: auto;
}
#transcript li {
  margin: 0.5rem 0;
  display: grid;
  gap: 0.15rem;
  border-left: 2px solid var(--border);
  padding-left: 0.6rem;
}
#transcript .t-time { color: var(--muted); font-size: 0.78rem; }
#transcript .t-op {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
#transcript .t-q { color: var(--muted); }
#transcript .t-r { word-break: break-word; }

/* ---- Dynamic graph ---- */
.graph { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem; }
.graph .node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--muted);
  border-radius: 6px;
  background: #12151d;
}
.graph .node + .node { position: relative; }
.graph .node + .node::before {
  content: "\2193";
  position: absolute;
  top: -0.85rem;
  left: 1rem;
  color: var(--muted);
  font-size: 0.75rem;
}
.node-name { font-size: 0.9rem; }
.node-state {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  min-width: 4.5rem;
  text-align: right;
}

.node[data-state="idle"] { border-left-color: var(--muted); opacity: 0.75; }
.node[data-state="active"] { border-left-color: var(--active); }
.node[data-state="active"] .node-state { color: var(--active); }
.node[data-state="success"] { border-left-color: var(--ok); }
.node[data-state="success"] .node-state { color: var(--ok); }
.node[data-state="required"] { border-left-color: var(--warn); }
.node[data-state="required"] .node-state { color: var(--warn); }
.node[data-state="managed"] { border-left-color: var(--managed); }
.node[data-state="managed"] .node-state { color: var(--managed); }
.node[data-state="conceptual"] { border-left-color: var(--accent-2); }
.node[data-state="conceptual"] .node-state { color: var(--accent-2); }
.node[data-state="error"] { border-left-color: var(--err); }
.node[data-state="error"] .node-state { color: var(--err); }

.legend {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--muted);
}
.legend li { display: flex; align-items: center; gap: 0.35rem; }
.legend li::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  display: inline-block;
  background: var(--muted);
}
.legend li[data-state="active"]::before { background: var(--active); }
.legend li[data-state="success"]::before { background: var(--ok); }
.legend li[data-state="required"]::before { background: var(--warn); }
.legend li[data-state="managed"]::before { background: var(--managed); }
.legend li[data-state="error"]::before { background: var(--err); }

/* ---- Safe token summary ---- */
.token { margin: 0; display: grid; gap: 0.35rem; }
.token > div {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.5rem;
  align-items: baseline;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
}
.token dt { color: var(--muted); font-size: 0.82rem; margin: 0; }
.token dd { margin: 0; word-break: break-word; font-size: 0.88rem; }

/* ---- Security artifacts ---- */
.artifacts { margin: 0; display: grid; gap: 0.35rem; }
.artifacts .artifact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 6rem 7rem;
  gap: 0.5rem;
  align-items: baseline;
  border: 1px solid var(--border);
  border-left: 4px solid var(--muted);
  border-radius: 6px;
  background: #12151d;
  padding: 0.5rem 0.7rem;
}
.artifacts dt { color: var(--fg); font-size: 0.85rem; margin: 0; }
.artifacts .a-state {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: right;
}
.artifacts .a-value {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
  text-align: right;
  word-break: break-word;
}
.artifact[data-state="idle"] { border-left-color: var(--muted); opacity: 0.75; }
.artifact[data-state="present"] { border-left-color: var(--ok); }
.artifact[data-state="present"] .a-state { color: var(--ok); }
.artifact[data-state="attached"] { border-left-color: var(--active); }
.artifact[data-state="attached"] .a-state { color: var(--active); }
.artifact[data-state="active"] { border-left-color: var(--active); }
.artifact[data-state="active"] .a-state { color: var(--active); }
.artifact[data-state="success"] { border-left-color: var(--ok); }
.artifact[data-state="success"] .a-state { color: var(--ok); }
.artifact[data-state="required"] { border-left-color: var(--warn); }
.artifact[data-state="required"] .a-state { color: var(--warn); }
.artifact[data-state="managed"] { border-left-color: var(--managed); }
.artifact[data-state="managed"] .a-state { color: var(--managed); }
.artifact[data-state="opened"] { border-left-color: var(--accent-2); }
.artifact[data-state="opened"] .a-state { color: var(--accent-2); }
.artifact[data-state="private"] { border-left-color: var(--managed); }
.artifact[data-state="private"] .a-state { color: var(--managed); }
.artifact[data-state="error"] { border-left-color: var(--err); }
.artifact[data-state="error"] .a-state { color: var(--err); }

/* Stack artifact columns on narrow viewports to preserve readability. */
@media (max-width: 520px) {
  .artifacts .artifact {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }
  .artifacts .a-state,
  .artifacts .a-value { text-align: left; }
}

.hidden { display: none !important; }

/* ---- Image-like OAuth sequence diagram ---- */
.authorization-flow {
  max-width: 1500px;
  margin: 0 auto 2rem;
  padding: 0 1.5rem;
}
.flow-shell {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}
.flow-intro h2 { margin: 0.15rem 0 0.4rem; font-size: 1.3rem; }
.flow-intro .hint { max-width: 82ch; }
.flow-eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.flow-session-status {
  margin: 0.8rem 0 1rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--muted);
  border-radius: 6px;
  background: #12151d;
  color: var(--muted);
  font-size: 0.85rem;
}
.flow-session-status[data-state="active"] { border-left-color: var(--active); color: var(--active); }
.flow-session-status[data-state="success"] { border-left-color: var(--ok); color: var(--ok); }
.flow-session-status[data-state="required"] { border-left-color: var(--warn); color: var(--warn); }
.flow-session-status[data-state="error"] { border-left-color: var(--err); color: var(--err); }
.sequence-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
  scrollbar-color: var(--accent-2) var(--border);
}
.sequence-scroll:focus-visible { outline: 2px solid var(--active); outline-offset: 2px; }
.sequence-diagram {
  display: block;
  width: 100%;
  min-width: 1180px;
  height: auto;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.sequence-phase { fill: #eef2f7; stroke: #d7dde7; stroke-width: 1; }
.sequence-phase-label {
  fill: #526173;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.sequence-lifelines line {
  stroke: #6b7280;
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.sequence-actors rect { fill: #3169b3; stroke: #1e4f91; stroke-width: 1; }
.sequence-actors text {
  fill: #fff;
  font-size: 12px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: middle;
}
.sequence-line {
  stroke: #334155;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}
.sequence-return { stroke-dasharray: 6 4; }
.sequence-arrow-head { fill: #334155; }
.sequence-label,
.flow-step-state {
  text-anchor: middle;
  paint-order: stroke;
  stroke: #f8fafc;
  stroke-width: 5px;
  stroke-linejoin: round;
}
.sequence-label { fill: #111827; font-size: 12px; }
.sequence-label-secondary { fill: #475569; font-size: 11px; }
.flow-step-state {
  fill: #64748b;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.sequence-event { opacity: 0.48; transition: opacity 160ms ease; }
.sequence-event .sequence-line,
.sequence-event .sequence-label,
.sequence-event .flow-step-state { transition: stroke 160ms ease, fill 160ms ease; }
.sequence-event[data-state="active"] { opacity: 1; }
.sequence-event[data-state="active"] .sequence-line { stroke: #0284c7; stroke-width: 3; }
.sequence-event[data-state="active"] .sequence-label,
.sequence-event[data-state="active"] .flow-step-state { fill: #0369a1; }
.sequence-event[data-state="success"] { opacity: 1; }
.sequence-event[data-state="success"] .sequence-line { stroke: #15803d; stroke-width: 3; }
.sequence-event[data-state="success"] .sequence-label,
.sequence-event[data-state="success"] .flow-step-state { fill: #166534; }
.sequence-event[data-state="required"] { opacity: 1; }
.sequence-event[data-state="required"] .sequence-line { stroke: #ca8a04; stroke-width: 3; }
.sequence-event[data-state="required"] .sequence-label,
.sequence-event[data-state="required"] .flow-step-state { fill: #a16207; }
.sequence-event[data-state="managed"] { opacity: 1; }
.sequence-event[data-state="managed"] .sequence-line { stroke: #7c3aed; stroke-width: 3; }
.sequence-event[data-state="managed"] .sequence-label,
.sequence-event[data-state="managed"] .flow-step-state { fill: #6d28d9; }
.sequence-event[data-state="error"] { opacity: 1; }
.sequence-event[data-state="error"] .sequence-line { stroke: #dc2626; stroke-width: 3; }
.sequence-event[data-state="error"] .sequence-label,
.sequence-event[data-state="error"] .flow-step-state { fill: #b91c1c; }
.sequence-scroll-hint {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}
.flow-security-note {
  margin: 1rem 0 0;
  padding: 0.75rem 0.9rem;
  border-left: 4px solid var(--managed);
  background: #12151d;
  color: var(--muted);
  font-size: 0.85rem;
}
.flow-security-note strong { color: var(--fg); }
@media (max-width: 899px) {
  .sequence-diagram { min-width: 1120px; }
  .flow-shell { padding: 1rem; }
}
@media (max-width: 520px) {
  .authorization-flow { padding: 0 0.75rem; }
  .flow-shell { padding: 0.8rem; }
}

/* ---- Architecture and security details after the end-to-end sequence ---- */
.post-flow-cards {
  max-width: 1500px;
  margin: 0 auto 2rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: start;
}
@media (max-width: 899px) {
  .post-flow-cards { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .post-flow-cards { padding: 0 0.75rem; }
}