/* ── Reset & base ──────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0f1117;
  --surface:     #1a1d27;
  --surface2:    #22263a;
  --border:      #2e3350;
  --accent:      #5c8aff;
  --accent-dim:  #3a5acc;
  --text:        #e8ecf4;
  --text-muted:  #7a83a6;
  --best:        #22c55e;
  --worst:       #ef4444;
  --done:        #f59e0b;
  --radius:      12px;
  --radius-sm:   8px;
  --font-mono:   'Courier New', 'Lucida Console', monospace;
  --transition:  0.18s ease;
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── Header ────────────────────────────────────────────────────────────────── */

header {
  width: 100%;
  max-width: 680px;
  padding: 1.25rem 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ── Language button ───────────────────────────────────────────────────────── */

#btn-lang {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  transition: color var(--transition), border-color var(--transition);
}
#btn-lang:hover { color: var(--text); border-color: var(--accent); }

/* ── Main wrapper ──────────────────────────────────────────────────────────── */

main {
  width: 100%;
  max-width: 680px;
  padding: 1.5rem 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Mode tabs ─────────────────────────────────────────────────────────────── */

.mode-tabs {
  display: flex;
  gap: 0.5rem;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 0.35rem;
}

.mode-tab {
  flex: 1;
  padding: 0.55rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.mode-tab.active, .mode-tab[aria-selected="true"] {
  background: var(--surface2);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}
.mode-tab:hover:not(.active) { color: var(--text); }

/* ── Display ───────────────────────────────────────────────────────────────── */

.display-wrap {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
}

#display {
  font-family: var(--font-mono);
  font-size: clamp(2.8rem, 10vw, 5.5rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text);
  line-height: 1;
  transition: color var(--transition);
  tabular-nums: yes;
  font-variant-numeric: tabular-nums;
}

#display.done {
  color: var(--done);
  animation: pulse 0.8s ease-in-out infinite alternate;
}

@keyframes pulse {
  from { opacity: 1; }
  to   { opacity: 0.5; }
}

/* ── Panels ────────────────────────────────────────────────────────────────── */

.panel { display: flex; flex-direction: column; gap: 1rem; }

/* ── Button groups ─────────────────────────────────────────────────────────── */

.btn-group {
  display: flex;
  gap: 0.75rem;
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */

.btn {
  flex: 1;
  padding: 0.85rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition), transform 0.08s;
  user-select: none;
}
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary[data-state="stop"] {
  background: #e05260;
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.12); }

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover:not(:disabled) { color: var(--text); border-color: var(--text-muted); }
.btn-ghost.active {
  color: var(--best);
  border-color: var(--best);
  background: rgba(34, 197, 94, 0.08);
}

/* ── Timer input row ───────────────────────────────────────────────────────── */

.timer-input-row {
  display: flex;
  gap: 0.5rem;
}

#timer-input {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  font-size: 1.1rem;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color var(--transition);
}
#timer-input::placeholder { color: var(--text-muted); }
#timer-input:focus { border-color: var(--accent); }
#timer-input.error { border-color: var(--worst); animation: shake 0.3s; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-6px); }
  75%       { transform: translateX(6px); }
}

#btn-set-timer {
  flex: 0 0 auto;
  padding: 0.7rem 1.25rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: border-color var(--transition), color var(--transition);
}
#btn-set-timer:hover { border-color: var(--accent); color: var(--accent); }

/* ── Lap table ─────────────────────────────────────────────────────────────── */

.lap-section {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
}

.lap-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.lap-table thead th {
  padding: 0.65rem 1rem;
  text-align: right;
  color: var(--text-muted);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.lap-table thead th:first-child { text-align: left; }

.lap-table tbody td {
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  text-align: right;
  border-bottom: 1px solid var(--border);
}
.lap-table tbody td:first-child { text-align: left; color: var(--text-muted); }
.lap-table tbody tr:last-child td { border-bottom: none; }

/* Badge on lap number cell */
.lap-table tbody td[data-badge]::after {
  content: attr(data-badge);
  display: inline-block;
  margin-left: 0.5rem;
  font-size: 0.65rem;
  font-family: -apple-system, sans-serif;
  font-weight: 600;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  vertical-align: middle;
}

.lap-row.best  td { color: var(--best); }
.lap-row.worst td { color: var(--worst); }
.lap-row.best td:first-child[data-badge]::after  { background: rgba(34,197,94,0.15); color: var(--best); }
.lap-row.worst td:first-child[data-badge]::after { background: rgba(239,68,68,0.15); color: var(--worst); }

.lap-row.best  { background: rgba(34,197,94,0.06); }
.lap-row.worst { background: rgba(239,68,68,0.06); }

#lap-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 1.5rem;
  font-size: 0.9rem;
}

/* ── Keyboard hints ────────────────────────────────────────────────────────── */

footer {
  width: 100%;
  max-width: 680px;
  padding: 0 1.5rem 2rem;
  text-align: center;
}

#key-hints {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ── Responsive ────────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
  header { padding: 1rem 1rem 0; }
  main   { padding: 1rem 1rem 1.5rem; }
  footer { padding: 0 1rem 1.5rem; }

  .btn-group { flex-wrap: wrap; }
  .btn-group .btn { flex: 1 1 calc(50% - 0.375rem); }
}