:root {
  --bg: #0d0d0f;
  --bg-card: #141418;
  --bg-card-hover: #181820;
  --bg-card-selected: #16221c;
  --bg-card-locked: #142a23;
  --border: #26262d;
  --border-strong: #3f3f47;
  --border-selected: #2f5a4a;
  --border-locked: #4ea582;
  --fg: #e4e4e7;
  --fg-dim: #8b8b94;
  --fg-faint: #5b5b63;
  --accent: #6dd6a8;
  --accent-strong: #34c388;
  --warn: #d8b264;
  --radius: 14px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* , *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-feature-settings: "ss01", "cv11";
  line-height: 1.5;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; -webkit-tap-highlight-color: transparent; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  background: rgba(13, 13, 15, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark {
  width: 32px; height: 32px;
  flex-shrink: 0;
  display: grid; place-items: center;
  background: #1a1a1f;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--fg);
}
.brand-text h1 {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-text p {
  font-size: 12px;
  color: var(--fg-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.status {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 5px 9px;
  border: 1px solid var(--border);
  border-radius: 999px;
  white-space: nowrap;
}
.status.is-saving { color: var(--warn); border-color: #4a3f1a; }
.status.is-saved  { color: var(--accent); border-color: #244a3a; }
.status.is-error  { color: #ff8c8c; border-color: #4a2424; }

main {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 18px 64px;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.intro p {
  color: var(--fg-dim);
  font-size: 15px;
  max-width: 56ch;
}
.counters {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.counter {
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--fg-dim);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.section-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-faint);
}
.section-head h2 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.cards {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 160ms ease, background 160ms ease, transform 100ms ease;
}
.card:active { transform: scale(0.997); }

.card[data-selected="true"] {
  background: var(--bg-card-selected);
  border-color: var(--border-selected);
}
.card[data-locked="true"] {
  background: var(--bg-card-locked);
  border-color: var(--border-locked);
  box-shadow: 0 0 0 1px rgba(78, 165, 130, 0.18);
}

.card-body {
  width: 100%;
  text-align: left;
  display: block;
  padding: 16px 16px 14px;
  cursor: pointer;
}
.card-body:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  min-height: 22px;
}
.card-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
}
.card-state { display: flex; gap: 6px; }
.state-pill {
  display: none;
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 7px;
  border-radius: 999px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid transparent;
}
.card[data-selected="true"] .state-pill[data-pill="selected"] {
  display: inline-block;
  color: var(--accent);
  border-color: var(--border-selected);
  background: rgba(109, 214, 168, 0.06);
}
.card[data-locked="true"] .state-pill[data-pill="selected"] { display: none; }
.card[data-locked="true"] .state-pill[data-pill="locked"] {
  display: inline-block;
  color: #0d0d0f;
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 6px;
  line-height: 1.35;
}
.card-text {
  font-size: 14.5px;
  color: var(--fg-dim);
  line-height: 1.55;
}
.card-why {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  font-size: 13px;
  color: var(--fg-dim);
  font-style: italic;
}
.card-why::before {
  content: "Why it works — ";
  font-style: normal;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

.card-actions {
  display: flex;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.15);
}
.card[data-selected="true"] .card-actions { border-color: var(--border-selected); }
.card[data-locked="true"] .card-actions { border-color: var(--border-locked); }

.lock-btn {
  flex: 1;
  padding: 12px 14px;
  min-height: 44px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: color 160ms ease, background 160ms ease;
}
.lock-btn:hover { color: var(--fg); background: rgba(255,255,255,0.02); }
.lock-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}
.lock-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.lock-label-locked { display: none; }
.card[data-locked="true"] .lock-btn { color: var(--accent-strong); }
.card[data-locked="true"] .lock-label-locked { display: inline; }
.card[data-locked="true"] .lock-label-default { display: none; }
.card[data-locked="true"] .lock-btn::before {
  content: "✓";
  font-family: var(--sans);
  font-weight: 700;
}
.card:not([data-selected="true"]) .lock-btn::before {
  content: "🔒";
  filter: grayscale(1) opacity(0.45);
}
.card[data-selected="true"]:not([data-locked="true"]) .lock-btn::before {
  content: "🔒";
}

.summary {
  background: linear-gradient(180deg, var(--bg-card) 0%, #101015 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
}
.summary h2 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.005em;
  margin-bottom: 4px;
}
.summary-hint {
  font-size: 13px;
  color: var(--fg-dim);
  margin-bottom: 14px;
}
.summary-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.summary-list li {
  font-size: 14px;
  padding: 10px 12px;
  background: rgba(78, 165, 130, 0.06);
  border: 1px solid rgba(78, 165, 130, 0.25);
  border-radius: 8px;
  color: var(--fg);
  line-height: 1.4;
}
.summary-list li .ref {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 2px;
}
.summary-empty {
  font-size: 13.5px;
  color: var(--fg-faint);
  font-style: italic;
}

.footer {
  text-align: center;
  padding: 28px 18px calc(28px + env(safe-area-inset-bottom));
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
  display: flex;
  justify-content: center;
  gap: 10px;
}
.footer-sep { color: var(--border); }

@media (min-width: 720px) {
  .topbar { padding: 16px 24px; }
  main { padding: 28px 24px 80px; gap: 44px; }
  .card-body { padding: 18px 20px 16px; }
  .card-title { font-size: 17px; }
  .card-text { font-size: 15px; }
}

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