:root {
  color-scheme: light;
  --bg: #eef0f3;
  --panel: #f7f8fa;
  --panel-soft: #eceff3;
  --text: #1f2937;
  --text-strong: #111827;
  --heading: #374151;
  --muted: #6b7280;
  --accent: #3b82f6;
  --accent-soft: #dbeafe;
  --danger: #ff7b00;
  --danger-soft: #fee2e2;
  --success: #1f9d63;
  --border: #cfd6df;
  --canvas-bg: #f3f4f6;
  --sidebar-grad-start: #f7f8fa;
  --sidebar-grad-end: #eceff3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: grid;
  grid-template-columns: 360px 1fr;
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 1rem;
  overflow-y: auto;
  background: linear-gradient(160deg, var(--sidebar-grad-start) 0%, var(--sidebar-grad-end) 60%);
}

.sidebar h1 {
  margin: 0 0 1rem;
  font-size: 1.4rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem;
  margin-bottom: 0.9rem;
}

.panel h2 {
  margin: 0 0 0.8rem;
  font-size: 1rem;
  color: var(--heading);
}

label {
  display: block;
  margin-bottom: 0.65rem;
  font-size: 0.88rem;
  color: var(--muted);
}

label.inline {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

input,
select,
button {
  width: 100%;
  margin-top: 0.35rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-soft);
  color: var(--text);
  padding: 0.6rem 0.7rem;
  font-size: 0.9rem;
}

button {
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
  margin-bottom: 0.45rem;
}

button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

button.primary {
  background: var(--accent-soft);
}

button.danger {
  background: var(--danger-soft);
}

.btn-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
}

.btn-row-2 > button {
  margin-bottom: 0.45rem;
}

.value {
  font-size: 0.9rem;
  color: var(--text-strong);
  margin-bottom: 0.3rem;
}

.hint {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.status {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--success);
}

.weapon-settings {
  margin-top: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 0.45rem 0.6rem;
}

.weapon-settings summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.88rem;
  list-style: none;
}

.weapon-settings summary::-webkit-details-marker {
  display: none;
}

.weapon-settings summary::after {
  content: '▸';
  float: right;
  color: var(--muted);
}

.weapon-settings[open] summary::after {
  content: '▾';
}

.weapon-settings[open] summary {
  margin-bottom: 0.55rem;
}

.canvas-area {
  padding: 1rem;
}

#targetCanvas {
  width: 100%;
  height: calc(100vh - 2rem);
  background: var(--canvas-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.sessions {
  display: grid;
  gap: 0.45rem;
}

.session-row {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 0.55rem;
  font-size: 0.8rem;
  cursor: pointer;
}

.session-row:hover {
  border-color: var(--accent);
}

.session-active {
  border-color: var(--accent) !important;
  background: var(--accent-soft);
}

.session-delete-btn {
  width: auto;
  padding: 2px 7px;
  margin: 0;
  font-size: 0.8rem;
  border-color: #6b3535;
  flex-shrink: 0;
}

button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.nav-link-btn {
  display: inline-block;
  width: 100%;
  margin-top: 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-soft);
  color: var(--text);
  padding: 0.6rem 0.7rem;
  font-size: 0.9rem;
  text-align: center;
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.nav-link-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.stats-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

.stats-topbar {
  display: flex;
  gap: 0.8rem;
  align-items: end;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.stats-topbar .grow {
  flex: 1;
  min-width: 260px;
}

.stats-chart-wrap {
  position: relative;
  height: 420px;
}

#statsChart {
  width: 100%;
  height: 100%;
  background: var(--canvas-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.stats-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.5rem;
  margin-top: 0.8rem;
}