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

:root {
  --bg: #1a1a2e;
  --bg-panel: #16213e;
  --bg-input: #0f3460;
  --text: #e0e0e0;
  --text-dim: #888;
  --accent: #00b4d8;
  --accent-hover: #48cae4;
  --danger: #e63946;
  --attacker: #4895ef;
  --defender: #ef476f;
  --border: #2a2a4a;
  --success: #06d6a0;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

header {
  padding: 0.5rem 1rem;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
}

main {
  display: flex;
  height: calc(100vh - 2.5rem);
}

/* Sidebar */
.sidebar {
  width: 340px;
  min-width: 200px;
  max-width: 600px;
  overflow-y: auto;
  padding: 0.75rem;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sidebar h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.sidebar h3 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.fleet-panel {
  background: rgba(0,0,0,0.2);
  padding: 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.preset-row {
  margin-bottom: 0.4rem;
}

/* Ship / Group entries */
.ship-entry, .group-entry {
  display: flex;
  gap: 0.3rem;
  align-items: center;
  margin-bottom: 0.3rem;
  flex-wrap: wrap;
}

.ship-entry select,
.ship-entry input,
.group-entry select,
.group-entry input {
  font-size: 0.8rem;
  padding: 0.2rem 0.3rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
}

.ship-entry input[type="number"] {
  width: 50px;
}

.group-entry input[type="number"] {
  width: 45px;
}

.btn-remove {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 1rem;
  padding: 0 0.2rem;
}

.sim-params {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin: 0.5rem 0;
}

.sim-params label {
  font-size: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sim-params input {
  width: 80px;
  font-size: 0.8rem;
  padding: 0.2rem 0.3rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
}

select {
  font-size: 0.8rem;
  padding: 0.2rem 0.3rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
}

/* Buttons */
.btn-primary {
  width: 100%;
  padding: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-small {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  margin-bottom: 0.3rem;
}

.btn-small:hover {
  background: rgba(255,255,255,0.15);
}

#sim-status {
  margin-top: 0.3rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Viewport */
.viewport {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.canvas-container {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

#battle-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Replay controls */
#replay-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

#replay-controls button {
  font-size: 0.85rem;
  padding: 0.2rem 0.5rem;
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}

#replay-controls button:hover {
  background: rgba(255,255,255,0.15);
}

#tick-scrubber {
  flex: 1;
  accent-color: var(--accent);
}

#tick-display {
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
  min-width: 90px;
}

#speed-slider {
  width: 80px;
  accent-color: var(--accent);
}

#replay-controls label {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

/* Stats */
#stats-content table {
  width: 100%;
  font-size: 0.75rem;
  border-collapse: collapse;
}

#stats-content th,
#stats-content td {
  padding: 0.2rem 0.35rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

#stats-content th {
  color: var(--accent);
  font-weight: 600;
}

.outcome-banner {
  padding: 0.4rem;
  border-radius: 4px;
  text-align: center;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.outcome-banner.attacker-win { background: rgba(72, 149, 239, 0.2); color: var(--attacker); }
.outcome-banner.defender-win { background: rgba(239, 71, 111, 0.2); color: var(--defender); }
.outcome-banner.draw { background: rgba(255, 255, 255, 0.1); color: var(--text-dim); }

/* Events */
#events-content {
  max-height: 300px;
  overflow-y: auto;
  font-size: 0.72rem;
  font-family: 'Cascadia Code', 'Consolas', monospace;
}

.event-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 0.35rem;
}

.event-filters label {
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.event-line {
  padding: 0.1rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.event-line .tick-label {
  color: var(--text-dim);
  margin-right: 0.3rem;
}

.event-line.weapon-fired { color: #fca311; }
.event-line.damage-dealt { color: #e76f51; }
.event-line.ship-destroyed { color: var(--danger); font-weight: 600; }
.event-line.missile-launched { color: #8ecae6; }
.event-line.missile-intercepted { color: #06d6a0; }
.event-line.missile-arrived { color: #f4a261; }
.event-line.shield-event { color: #9b5de5; }
.event-line.ammo-exhausted { color: var(--text-dim); }

/* Chart panel */
#chart-panel {
  flex: none;
  height: 220px;
  min-height: 120px;
  max-height: 500px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0.75rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.chart-header label {
  font-size: 0.8rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

#chart-canvas {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: block;
}

/* Clickable stats rows */
#stats-content tbody tr {
  cursor: pointer;
  transition: background 0.1s;
}

#stats-content tbody tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

#stats-content tbody tr.selected {
  background: rgba(0, 180, 216, 0.15);
}

/* Resize handles */
.resize-handle {
  flex-shrink: 0;
  background: transparent;
  transition: background 0.15s;
  z-index: 10;
}
.resize-handle:hover,
.resize-handle:active {
  background: var(--accent);
}

.resize-handle-v {
  width: 4px;
  cursor: col-resize;
}

.resize-handle-h {
  height: 4px;
  cursor: row-resize;
}

/* Utility */
.hidden {
  display: none !important;
}

/* Auth page */
#auth-section,
#dashboard-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: 1.25rem;
}

#auth-section h1,
#dashboard-section h1 {
  font-size: 1.6rem;
  color: var(--accent);
}

.auth-tabs {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.auth-tab {
  flex: 1;
  padding: 0.4rem 1.5rem;
  background: var(--bg-panel);
  color: var(--text-dim);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.15s, color 0.15s;
}

.auth-tab.active {
  background: var(--accent);
  color: #000;
  font-weight: 600;
}

#login-form,
#register-form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  width: 280px;
}

#login-form input,
#register-form input {
  padding: 0.5rem 0.75rem;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.9rem;
}

#login-form input:focus,
#register-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-error {
  font-size: 0.8rem;
  color: var(--danger);
  min-height: 1em;
}

.dashboard-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 280px;
}

.dashboard-actions a.btn-primary {
  display: block;
  text-align: center;
  text-decoration: none;
}

.btn-secondary {
  width: 100%;
  padding: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}