:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #f0f0f0;
  --text-secondary: #888888;
  --accent: #f5a623;
  --danger: #e53e3e;
  --success: #38a169;

  --font-head: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --maxw: 720px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

#app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 20px 64px;
}

h1,
h2,
h3 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.1;
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.screen {
  animation: fade 150ms ease;
}

.hidden {
  display: none !important;
}

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

.hero {
  text-align: center;
  margin: 48px 0 40px;
}

.brand {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand.small {
  font-size: 40px;
}

.subtitle {
  margin: 12px 0 0;
  color: var(--text-secondary);
  font-size: 18px;
}

.btn {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 14px 24px;
  cursor: pointer;
  transition: border-color 120ms ease, color 120ms ease, background 120ms ease;
}

.btn:hover {
  border-color: var(--text-secondary);
}

.btn-primary {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent);
  color: var(--bg);
}

.mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 40px;
}

.mode-buttons .btn {
  padding: 28px;
  font-size: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 24px;
}

.preview-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 8px;
}

.preview-head h2 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

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

.preview-list li {
  display: grid;
  grid-template-columns: 24px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

.preview-list li:first-child {
  border-top: none;
}

.preview-list .rank {
  color: var(--text-secondary);
}

.preview-list .pts {
  color: var(--accent);
  font-weight: 700;
}

.preview-list .preview-empty {
  display: block;
  border-top: none;
  color: var(--text-secondary);
}

.linklike {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--accent);
  cursor: pointer;
}

.linklike:hover {
  text-decoration: underline;
}

.mode-desc {
  font-size: 18px;
  line-height: 1.6;
  margin: 0 0 24px;
}

.actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  margin-bottom: 40px;
}

.logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
}

.topbar-center {
  flex: 1;
  text-align: center;
}

.timer {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.timer.danger {
  color: var(--danger);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.45;
  }
}

.btn-end {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 13px;
  padding: 6px 14px;
  cursor: pointer;
}

.btn-end:hover {
  border-color: var(--text-secondary);
  color: var(--text);
}

.status {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.1;
}

.status-value {
  font-size: 22px;
  font-weight: 700;
}

.status-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.badge[data-level="1"] {
  color: var(--success);
  border-color: var(--success);
}

.badge[data-level="2"] {
  color: var(--accent);
  border-color: var(--accent);
}

.badge[data-level="3"] {
  color: var(--danger);
  border-color: var(--danger);
}

.prompt {
  font-size: 30px;
  line-height: 1.25;
  margin: 0 0 28px;
}

.answer {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 28px;
  padding: 16px;
  outline: none;
}

.answer:focus {
  border-color: var(--accent);
}

.unit-label {
  color: var(--text-secondary);
  margin: 12px 0 0;
}

.unit-label span {
  color: var(--text);
}

.error {
  color: var(--danger);
  margin: 12px 0 0;
}

#question-view .actions {
  margin-top: 28px;
}

.points {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 24px;
}

.points-value {
  font-size: 72px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.points-label {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.result-lines p {
  margin: 6px 0;
  font-size: 18px;
}

.decomposition {
  margin: 24px 0 0;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  line-height: 1.6;
}

.result-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 28px;
}

.running {
  color: var(--text-secondary);
}

.end-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 16px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
}

.breakdown {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.breakdown th,
.breakdown td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

.breakdown th {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.breakdown th:first-child,
.breakdown td:first-child {
  text-align: left;
}

.breakdown th:not(:first-child),
.breakdown td:not(:first-child) {
  text-align: right;
}

.breakdown .skip {
  color: var(--text-secondary);
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 16px;
  cursor: pointer;
}

.tab:hover:not(.is-active) {
  border-color: var(--text-secondary);
  color: var(--text);
}

.tab.is-active {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

.board {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.board th,
.board td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: right;
}

.board th:nth-child(2),
.board td:nth-child(2) {
  text-align: left;
}

.board th {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.board .is-mine {
  background: rgba(245, 166, 35, 0.12);
}

.board .is-mine td {
  color: var(--accent);
}

.board-empty {
  text-align: center !important;
  color: var(--text-secondary);
  padding: 20px 12px;
}

.submit-card {
  margin-bottom: 16px;
}

.submit-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

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

#player-name {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  padding: 12px 14px;
  outline: none;
}

#player-name:focus {
  border-color: var(--accent);
}

#player-name:disabled {
  opacity: 0.6;
}

.submit-msg {
  margin: 14px 0 0;
}

.submit-msg.is-success {
  color: var(--success);
}

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

#goto-board {
  margin-top: 12px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

@media (max-width: 600px) {
  #app {
    padding: 24px 16px 48px;
  }

  .brand {
    font-size: 48px;
  }

  .mode-buttons {
    grid-template-columns: 1fr;
  }

  .prompt {
    font-size: 24px;
  }

  .points-value {
    font-size: 56px;
  }

  .end-summary {
    grid-template-columns: repeat(2, 1fr);
  }

  .breakdown {
    font-size: 12px;
  }

  .board {
    font-size: 12px;
  }

  .submit-row {
    flex-direction: column;
  }
}