:root {
  color-scheme: dark;
  --bg: #0d1117;
  --bg-elevated: #151b23;
  --bg-card: #18202b;
  --bg-card-2: #1f2937;
  --border: rgba(148, 163, 184, 0.14);
  --text: #e5eef8;
  --muted: #9fb0c3;
  --accent: #29c7c7;
  --accent-2: #4da3ff;
  --danger: #ff6b7a;
  --success: #61d095;
  --shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
  --radius: 18px;
  --radius-sm: 12px;
  --gap: 16px;
  --transition: 160ms ease;
  --touch-min: 56px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(41, 199, 199, 0.14), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(77, 163, 255, 0.12), transparent 26%),
    var(--bg);
  color: var(--text);
}

button, input, select {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.app-shell {
  width: min(1180px, calc(100% - 24px));
  margin: 0 auto;
  padding: 18px 0 28px;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent 100%), var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 18px 16px;
  margin-bottom: 16px;
}

h1, h2, p { margin: 0; }
h1 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h2 { font-size: 1.02rem; }

.muted, .hint, .control-label, .error-text { color: var(--muted); }
.muted { margin-top: 4px; }
.hint { font-size: 0.88rem; }

.app-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.toolbar, .dice-card, .stats-card, .chart-card, .log-card {
  padding: 16px;
}

.section-heading-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.help-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.22);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  transition: transform var(--transition), border-color var(--transition), color var(--transition);
  flex-shrink: 0;
}

.help-btn:hover {
  transform: scale(1.08);
  border-color: rgba(77, 163, 255, 0.5);
  color: var(--text);
}

.help-btn:focus-visible {
  outline: 2px solid rgba(41, 199, 199, 0.6);
  outline-offset: 2px;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-label {
  font-size: 0.88rem;
}

.control-select, .control-input {
  min-height: var(--touch-min);
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: var(--bg-elevated);
  color: var(--text);
  padding: 0 14px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.control-select:focus-visible, .control-input:focus-visible, .segmented-btn:focus-visible, .dice-btn:focus-visible, .secondary-btn:focus-visible {
  outline: 2px solid rgba(41, 199, 199, 0.6);
  outline-offset: 2px;
}

.control-select:hover, .control-input:hover {
  border-color: rgba(41, 199, 199, 0.42);
}

.control-input { width: 100%; }

.segmented {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.segmented-btn, .secondary-btn {
  min-height: var(--touch-min);
  border-radius: 14px;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.18);
  transition: transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.segmented-btn[aria-pressed="true"] {
  background: linear-gradient(180deg, rgba(41, 199, 199, 0.24), rgba(41, 199, 199, 0.14));
  border-color: rgba(41, 199, 199, 0.46);
  box-shadow: inset 0 0 0 1px rgba(41, 199, 199, 0.14);
}

.secondary-btn {
  padding: 0 16px;
  min-width: 92px;
  background: linear-gradient(180deg, rgba(77, 163, 255, 0.18), rgba(77, 163, 255, 0.1));
  border-color: rgba(77, 163, 255, 0.26);
}

.segmented-btn:hover, .secondary-btn:hover, .dice-btn:hover {
  transform: translateY(-1px);
}

.segmented-btn:active, .secondary-btn:active, .dice-btn:active {
  transform: scale(0.98);
}

.status-panel {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.dice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(84px, 1fr));
  gap: 12px;
}

.dice-btn {
  min-height: var(--touch-min);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.05), transparent 60%), var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.16);
  color: var(--text);
  position: relative;
  display: grid;
  place-items: center;
  padding: 10px;
  box-shadow: inset 0 -1px 0 rgba(255,255,255,0.03);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition), filter var(--transition);
  user-select: none;
  overflow: hidden;
}

.dice-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 25%, rgba(255,255,255,0.12), transparent 44%);
  opacity: 0.65;
  pointer-events: none;
}

.dice-btn:hover {
  border-color: rgba(41, 199, 199, 0.42);
}

.dice-btn.pressed {
  transform: scale(0.95);
  border-color: rgba(41, 199, 199, 0.75);
  box-shadow: 0 0 0 1px rgba(41, 199, 199, 0.2), 0 0 0 6px rgba(41, 199, 199, 0.08);
}

.dice-btn.selected {
  border-color: rgba(41, 199, 199, 0.8);
  box-shadow: 0 0 0 1px rgba(41, 199, 199, 0.18), 0 0 0 7px rgba(41, 199, 199, 0.09);
}

.dice-btn.last-roll {
  border-color: rgba(77, 163, 255, 0.7);
  box-shadow: 0 0 0 1px rgba(77, 163, 255, 0.2), 0 0 0 7px rgba(77, 163, 255, 0.08);
}

.dice-btn.flash {
  animation: flash-pop 260ms ease-out;
}

.die-face {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  gap: 2px;
}

.die-face .face-number {
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
}

.die-face .face-caption {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.pips {
  width: 40px;
  height: 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
}

.pip {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(180deg, #f3f7fb, #cfd8e3);
  box-shadow: 0 1px 2px rgba(0,0,0,0.4);
  align-self: center;
  justify-self: center;
}

.pip.inactive {
  opacity: 0;
}

.hidden { display: none !important; }
.error-text { margin-top: 10px; min-height: 1.2em; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
}

.stat-card {
  background: var(--bg-elevated);
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.14);
  padding: 14px;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-value {
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.stat-label {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.stat-subtext {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.35;
}

.chart-wrap {
  position: relative;
  min-height: 320px;
}

.chart-wrap canvas {
  width: 100% !important;
  height: 320px !important;
}

.chart-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 0.95rem;
  background: linear-gradient(180deg, rgba(13, 17, 23, 0.08), rgba(13, 17, 23, 0.18));
  border-radius: 14px;
  pointer-events: none;
}

.recent-rolls {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.recent-roll-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.recent-main {
  display: grid;
  gap: 3px;
}

.recent-title {
  font-weight: 700;
}

.recent-meta {
  font-size: 0.82rem;
  color: var(--muted);
}

.recent-value {
  font-weight: 800;
  color: var(--accent);
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes flash-pop {
  0% { transform: scale(0.96); filter: brightness(1.05); }
  45% { transform: scale(1.03); filter: brightness(1.2); }
  100% { transform: scale(1); filter: brightness(1); }
}

@media (min-width: 860px) {
  .app-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .toolbar { grid-column: 1 / -1; }
  .dice-card { grid-column: 1 / -1; }
  .stats-card { grid-column: 1; }
  .chart-card { grid-column: 2; }
  .log-card { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .app-shell { width: min(100% - 16px, 100%); padding-top: 10px; }
  .app-header { flex-direction: column; align-items: stretch; }
  .secondary-btn { width: 100%; }
  .recent-roll-item { flex-direction: column; }
  .chart-wrap, .chart-wrap canvas { height: 280px !important; min-height: 280px; }
  .modal-card { max-height: 90vh; }
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: grid;
  place-items: center;
  padding: 16px;
  animation: fade-in 200ms ease;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  width: min(580px, 100%);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid rgba(148, 163, 184, 0.18);
  color: var(--muted);
  font-size: 1.3rem;
  display: grid;
  place-items: center;
  transition: background var(--transition), color var(--transition);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.modal-body {
  padding: 18px 20px 24px;
  overflow-y: auto;
  display: grid;
  gap: 20px;
}

.help-item h3 {
  font-size: 0.95rem;
  margin: 0 0 6px;
  color: var(--accent);
}

.help-item p,
.help-item ul {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0;
}

.help-item ul {
  padding-left: 18px;
  margin-top: 6px;
}

.help-item li {
  margin-bottom: 4px;
}

.help-item strong {
  color: var(--text);
}

/* Header logo */
.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-logo {
  flex-shrink: 0;
  display: grid;
  place-items: center;
}

/* Toggle switch */
.toggle-label {
  cursor: default;
}

.toggle-switch {
  min-height: var(--touch-min);
  border-radius: 14px;
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.18);
  padding: 0 14px;
  display: grid;
  align-items: center;
  transition: border-color var(--transition);
}

.toggle-switch:hover {
  border-color: rgba(41, 199, 199, 0.42);
}

.toggle-track {
  width: 44px;
  height: 26px;
  border-radius: 13px;
  background: rgba(148, 163, 184, 0.25);
  position: relative;
  transition: background var(--transition);
}

.toggle-switch[aria-checked="true"] .toggle-track {
  background: rgba(41, 199, 199, 0.5);
}

.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text);
  transition: transform var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.toggle-switch[aria-checked="true"] .toggle-thumb {
  transform: translateX(18px);
}

/* Doubles stat highlight */
.stat-card.doubles-stat {
  border-color: rgba(255, 210, 80, 0.3);
  background: linear-gradient(180deg, rgba(255, 210, 80, 0.06), var(--bg-elevated));
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}