:root {
  --bg-color: #f3f4f6;
  --text-main: #1f2937;
  --text-sub: #6b7280;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --btn-text: #ffffff;
  --btn-disabled-bg: #e5e7eb;
  --btn-disabled-text: #9ca3af;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius: 12px;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --text-main: #f8fafc;
  --text-sub: #94a3b8;
  --card-bg: #1e293b;
  --border-color: #334155;
  --btn-disabled-bg: #334155;
  --btn-disabled-text: #64748b;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100vh;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.header-controls {
  display: flex;
  gap: 16px;
  align-items: center;
}

.icon-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-main);
}

.card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: background-color 0.3s, border-color 0.3s;
}

.card.compact {
  padding: 12px 16px;
}

.status-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  font-size: 0.95rem;
}

#gpsAccuracyBox {
  color: var(--text-sub);
  font-size: 0.85rem;
}

/* Toggle Switch */
.toggle-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 0.95rem;
}

.toggle-container input {
  display: none;
}

.toggle-slider {
  position: relative;
  width: 44px;
  height: 24px;
  background-color: var(--btn-disabled-bg);
  border-radius: 34px;
  transition: .4s;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: .4s;
}

input:checked + .toggle-slider {
  background-color: var(--accent);
}

input:checked + .toggle-slider:before {
  transform: translateX(20px);
}

/* Main Action Button */
.main-action {
  display: flex;
  justify-content: center;
  margin: 4px 0;
}

#recordBtn {
  width: 100%;
  padding: 24px 20px;
  font-size: 1.4rem;
  font-weight: bold;
  color: var(--btn-text);
  background-color: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background-color 0.2s, transform 0.1s;
}

#recordBtn:active:not(:disabled) {
  transform: scale(0.98);
}

#recordBtn:disabled {
  background-color: var(--btn-disabled-bg);
  color: var(--btn-disabled-text);
  cursor: not-allowed;
  transform: none;
}

/* Data Section */
.data-section h2 {
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.period-ui {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

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

.input-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.input-group label {
  font-size: 0.85rem;
  color: var(--text-sub);
}

input[type="datetime-local"] {
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.9rem;
  width: 100%;
}

.help-text {
  font-size: 0.8rem;
  color: var(--text-sub);
}

.action-buttons {
  display: flex;
  gap: 8px;
}

.action-buttons.horizontal {
  flex-direction: row;
}

.action-buttons button {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--btn-text);
  transition: background-color 0.2s;
}

.secondary-btn {
  background-color: var(--text-sub) !important;
}
.secondary-btn:hover {
  background-color: var(--text-main) !important;
}

.danger-btn {
  background-color: var(--danger) !important;
}
.danger-btn:hover {
  background-color: var(--danger-hover) !important;
}

/* Install Pane */
.install-pane {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--card-bg);
  border-top: 1px solid var(--border-color);
  box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
  padding: 16px 20px 24px 20px;
  z-index: 1000;
  transform: translateY(0);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] .install-pane {
  box-shadow: 0 -4px 12px rgba(0,0,0,0.4);
}

.install-pane.hidden {
  transform: translateY(100%);
  pointer-events: none;
}

.install-pane-content {
  max-width: 480px;
  margin: 0 auto;
}

.install-pane p {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.install-desc {
  font-size: 0.85rem !important;
  color: var(--text-sub);
  margin-bottom: 12px !important;
  line-height: 1.4;
}

.install-actions.horizontal {
  display: flex;
  flex-direction: row;
  gap: 8px;
}

.install-actions button {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: none;
  font-weight: bold;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background-color 0.2s, opacity 0.2s;
}

.primary-btn {
  background-color: var(--accent) !important;
  color: #fff !important;
}
.primary-btn:hover {
  background-color: var(--accent-hover) !important;
}

body.has-install-pane .container {
  padding-bottom: 160px;
}