:root {
  --ink: #16191d;
  --ink-soft: #4a525c;
  --ink-faint: #7b848e;
  --paper: #f4f2ee;
  --card: #ffffff;
  --rule: #dcd8d0;
  --focus: #1d4ed8;

  --l1: #1f6f8b;
  --l1-wash: #e3f0f4;
  --l2: #a35c00;
  --l2-wash: #fbefdc;
  --l3: #b3261e;
  --l3-wash: #fbe5e3;

  --warn: #a35c00;
  --danger: #b3261e;

  --radius: 14px;
  --shadow: 0 1px 2px rgb(22 25 29 / 6%), 0 8px 24px rgb(22 25 29 / 6%);
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;
  --sans: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 var(--sans);
}

.shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.masthead { margin-bottom: 20px; }

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.eyebrow {
  margin: 0;
  color: var(--ink-faint);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.panel {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.panel-title {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

.id-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

input[type="text"] {
  flex: 1 1 220px;
  min-width: 0;
  padding: 12px 14px;
  border: 1.5px solid var(--rule);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font: 600 1.35rem/1.2 var(--mono);
  letter-spacing: 0.08em;
}

input[type="text"]::placeholder { color: #b9bec4; letter-spacing: 0.08em; }

input[type="text"]:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.hint {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.hint.is-error { color: var(--danger); }

/* Buttons */
.btn {
  appearance: none;
  border: 1.5px solid transparent;
  border-radius: 10px;
  padding: 12px 20px;
  font: 600 1rem/1.2 var(--sans);
  cursor: pointer;
  transition: background-color 120ms, border-color 120ms, opacity 120ms;
}

.btn:disabled { cursor: not-allowed; opacity: 0.45; }

.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:not(:disabled):hover { background: #2c3238; }

.btn-secondary { background: #fff; color: var(--ink); border-color: var(--rule); }
.btn-secondary:not(:disabled):hover { border-color: var(--ink-soft); }

.btn-quiet {
  background: none;
  color: var(--ink-soft);
  padding: 8px 4px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn-trigger {
  background: #fff;
  color: var(--ink);
  border-color: var(--ink);
  flex: 1 1 160px;
  padding: 14px 16px;
}
.btn-trigger:not(:disabled):hover { background: var(--ink); color: #fff; }

/* Session header and countdown */
.session-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
}

.session-id {
  margin: 2px 0 0;
  font: 700 1.6rem/1.2 var(--mono);
  letter-spacing: 0.06em;
}

.clock-wrap { text-align: right; }

.clock {
  margin: 0;
  font: 700 clamp(3rem, 9vw, 4.75rem)/1 var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.clock.is-warn { color: var(--warn); }
.clock.is-out { color: var(--danger); }

.bar {
  height: 6px;
  margin: 16px 0 24px;
  border-radius: 999px;
  background: #ebe8e2;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: var(--ink);
  transform-origin: left center;
  transition: transform 250ms linear;
}

.bar-fill.is-warn { background: var(--warn); }

/* Intervention level buttons */
.levels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.level {
  --tone: var(--ink);
  --wash: #f2f2f2;
  appearance: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-height: 150px;
  padding: 18px;
  border: 2px solid var(--tone);
  border-radius: var(--radius);
  background: var(--wash);
  color: var(--ink);
  font-family: var(--sans);
  text-align: left;
  cursor: pointer;
  transition: transform 80ms, box-shadow 120ms, opacity 120ms;
}

.level-1 { --tone: var(--l1); --wash: var(--l1-wash); }
.level-2 { --tone: var(--l2); --wash: var(--l2-wash); }
.level-3 { --tone: var(--l3); --wash: var(--l3-wash); }

.level:not(:disabled):hover { box-shadow: 0 0 0 4px color-mix(in srgb, var(--tone) 18%, transparent); }
.level:not(:disabled):active { transform: translateY(1px); }
.level:disabled { cursor: not-allowed; opacity: 0.4; }
.levels.is-locked .level { filter: grayscale(1); }

.level-code {
  color: var(--tone);
  font: 800 2rem/1 var(--mono);
}

.level-name {
  font-size: 1.1rem;
  font-weight: 700;
}

.level-desc {
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.35;
}

/* Trigger picker */
.picker {
  margin-top: 16px;
  padding: 18px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: #fffdf8;
}

.picker-title {
  margin: 0 0 12px;
  font-weight: 700;
}

.picker-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 6px;
}

/* End-of-session summary */
.summary { margin-top: 20px; }

.summary-title {
  margin: 0 0 14px;
  font-size: 1.1rem;
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.stat {
  padding: 16px 18px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: #faf9f6;
}

.stat-value {
  margin: 4px 0 2px;
  font: 700 2.4rem/1 var(--mono);
  font-variant-numeric: tabular-nums;
}

.stat-note {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.summary-table caption {
  padding: 12px 14px 4px;
  text-align: left;
}

.summary-table th,
.summary-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #efece6;
  text-align: right;
  white-space: nowrap;
}

.summary-table thead th {
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: normal;
  vertical-align: bottom;
}

.summary-table th:first-child { text-align: left; }

.summary-table td { font: 600 1.05rem/1.2 var(--mono); }

.summary-table .row-label {
  font-weight: 600;
  border-left: 4px solid var(--tone, transparent);
}

.summary-table tr.level-1 { --tone: var(--l1); }
.summary-table tr.level-2 { --tone: var(--l2); }
.summary-table tr.level-3 { --tone: var(--l3); }

.summary-table .is-zero { color: #c3c7cc; }
.summary-table .is-total { background: #faf9f6; }
.summary-table tfoot th,
.summary-table tfoot td {
  border-bottom: 0;
  border-top: 2px solid var(--ink);
  background: #faf9f6;
  font-weight: 700;
}

.summary .hint { margin-top: 14px; }

.session-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.counts {
  margin: 0;
  font: 600 1rem/1.2 var(--mono);
  color: var(--ink-soft);
}

/* Session log */
.log-title {
  margin: 24px 0 8px;
  font-size: 0.95rem;
}

.log {
  margin: 0;
  padding: 0;
  list-style: none;
}

.log-item {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 8px 0 8px 12px;
  border-left: 4px solid var(--tone, var(--ink));
  border-bottom: 1px solid #efece6;
}

.log-item.level-1 { --tone: var(--l1); }
.log-item.level-2 { --tone: var(--l2); }
.log-item.level-3 { --tone: var(--l3); }

.log-time { font: 600 0.95rem/1.2 var(--mono); }
.log-level { font-weight: 600; }
.log-trigger { color: var(--ink-soft); font-size: 0.9rem; }
.log-trigger.is-pending { color: var(--warn); font-style: italic; }

/* Messages and footer */
.message {
  margin: 16px 0 0;
  padding: 12px 16px;
  border-radius: 10px;
  background: #e8eef8;
  color: #1e3a6e;
}

.message[data-kind="error"] { background: var(--l3-wash); color: #7a1a14; }

.rules {
  margin-top: 28px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.rules p { margin: 0; }

@media (max-width: 720px) {
  .summary-stats { gap: 10px; }
  .stat { padding: 14px; }
  .stat-value { font-size: 2rem; }
  .summary-table th,
  .summary-table td { padding: 9px 7px; }
  .summary-table thead th { font-size: 0.72rem; }
  .summary-table .row-name { display: none; }
}

@media (max-width: 720px) {
  .shell { padding: 20px 14px 36px; }
  .panel { padding: 18px; }
  .levels { grid-template-columns: 1fr; }
  .level { min-height: 0; }
  .clock-wrap { text-align: left; }
  .log-item { grid-template-columns: 4rem minmax(0, 1fr); }
  .log-trigger { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}