/* ============================================================
   Solar Panel Tracker — Design System
   Mobile-first dark theme for outdoor rooftop use
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- Tokens --- */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-surface: #1f2937;
  --bg-surface-hover: #2a3548;
  --bg-glass: rgba(31, 41, 55, 0.7);

  --accent: #f59e0b;
  --accent-glow: rgba(245, 158, 11, 0.25);
  --accent-hover: #d97706;
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --warning: #f59e0b;
  --info: #3b82f6;
  --info-bg: rgba(59, 130, 246, 0.15);

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-accent: #fbbf24;

  --border: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(245, 158, 11, 0.3);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--accent-glow);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100dvh;
  overflow-x: hidden;
  line-height: 1.5;
}

input, button, select, textarea { font-family: inherit; font-size: inherit; }

/* --- App Layout --- */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  position: relative;
  overflow: hidden;
}

/* --- Header --- */
.header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  min-height: 56px;
  flex-shrink: 0;
}

.header-menu-btn {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: none; border: none; color: var(--text-primary);
  font-size: 22px; cursor: pointer; border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.header-menu-btn:hover { background: var(--bg-surface); }

.header-title {
  font-size: 18px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #fbbf24);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; flex: 1;
}

.header-back { display: none; }
.header-back.visible { display: flex; }
.header-actions { display: flex; gap: 8px; }

.header-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-surface); border: 1px solid var(--border);
  color: var(--text-secondary); border-radius: var(--radius-sm);
  cursor: pointer; font-size: 16px; transition: all var(--transition);
}
.header-btn:hover { background: var(--bg-surface-hover); color: var(--text-primary); }

/* --- Screens --- */
.screen {
  display: none;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}
.screen.active { display: flex; flex-direction: column; }

/* --- Navigation Drawer --- */
.drawer-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.6);
  z-index: 200; opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.drawer-overlay.active { opacity: 1; pointer-events: auto; }

.drawer {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: 280px; max-width: 80vw;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  z-index: 201;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex; flex-direction: column;
}
.drawer-overlay.active + .drawer,
.drawer.active { transform: translateX(0); }

.drawer-header {
  padding: 24px 20px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(16, 185, 129, 0.05));
  border-bottom: 1px solid var(--border);
}
.drawer-header h2 {
  font-size: 20px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #fbbf24);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.drawer-header p { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

.drawer-nav { flex: 1; padding: 12px; }

.drawer-item {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 16px; border-radius: var(--radius-md);
  color: var(--text-secondary); cursor: pointer;
  transition: all var(--transition); font-weight: 500;
  border: none; background: none; width: 100%; text-align: left; font-size: 15px;
}
.drawer-item:hover, .drawer-item.active {
  background: var(--bg-surface); color: var(--text-primary);
}
.drawer-item.active { border-left: 3px solid var(--accent); }
.drawer-item-icon { font-size: 20px; width: 28px; text-align: center; }

.drawer-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-muted); text-align: center;
}

/* --- Projects List --- */
.projects-header {
  padding: 20px 16px 12px;
  display: flex; align-items: center; justify-content: space-between;
}
.projects-header h1 {
  font-size: 24px; font-weight: 800; color: var(--text-primary);
}

.projects-grid {
  padding: 0 16px 100px;
  display: flex; flex-direction: column; gap: 12px;
}

.project-card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--success));
  opacity: 0; transition: opacity var(--transition);
}
.project-card:hover::before,
.project-card:active::before { opacity: 1; }
.project-card:active { transform: scale(0.98); }

.project-card-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 12px;
}
.project-card-name { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.project-card-date { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

.project-card-status {
  padding: 4px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
}
.status-new { background: var(--info-bg); color: var(--info); }
.status-in-progress { background: var(--accent-glow); color: var(--accent); }
.status-completed { background: var(--success-bg); color: var(--success); }

.project-card-progress { margin-top: 4px; }
.progress-bar-bg {
  height: 6px; background: var(--bg-primary);
  border-radius: 3px; overflow: hidden; margin-top: 8px;
}
.progress-bar-fill {
  height: 100%; border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--success));
  transition: width 0.5s ease;
}
.progress-text {
  font-size: 13px; color: var(--text-secondary);
  display: flex; justify-content: space-between;
}

.project-card-actions {
  display: flex; gap: 8px; margin-top: 12px;
  padding-top: 12px; border-top: 1px solid var(--border);
}

.card-action-btn {
  flex: 1; padding: 8px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-surface);
  color: var(--text-secondary); font-size: 12px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.card-action-btn:hover { background: var(--bg-surface-hover); color: var(--text-primary); }
.card-action-btn.danger:hover { background: var(--danger-bg); color: var(--danger); }

/* Empty state */
.empty-state {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 60px 32px; text-align: center; flex: 1;
}
.empty-state-icon { font-size: 64px; margin-bottom: 16px; opacity: 0.6; }
.empty-state h2 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.empty-state p { color: var(--text-muted); margin-bottom: 24px; max-width: 280px; }

/* --- FAB --- */
.fab {
  position: fixed; bottom: 24px; right: 20px;
  width: 56px; height: 56px;
  background: linear-gradient(135deg, var(--accent), #d97706);
  border: none; border-radius: 50%;
  color: #000; font-size: 28px; font-weight: 700;
  cursor: pointer; z-index: 50;
  box-shadow: var(--shadow-glow), var(--shadow-md);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.fab:hover { transform: scale(1.1); }
.fab:active { transform: scale(0.95); }

/* --- Editor Screen --- */
.editor-toolbar {
  display: flex; gap: 8px; padding: 8px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  overflow-x: auto; flex-shrink: 0;
  scrollbar-width: none;
}
.editor-toolbar::-webkit-scrollbar { display: none; }

.toolbar-btn {
  padding: 8px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-surface);
  color: var(--text-secondary); font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  white-space: nowrap; display: flex; align-items: center; gap: 6px;
}
.toolbar-btn:hover { background: var(--bg-surface-hover); color: var(--text-primary); }
.toolbar-btn.active { background: var(--accent-glow); color: var(--accent); border-color: var(--border-accent); }
.toolbar-btn .icon { font-size: 16px; }

/* Page tabs */
.page-tabs {
  display: flex; gap: 4px; padding: 8px 12px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  overflow-x: auto; flex-shrink: 0;
}
.page-tab {
  padding: 6px 16px; border-radius: 20px;
  border: 1px solid var(--border); background: var(--bg-surface);
  color: var(--text-muted); font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all var(--transition); white-space: nowrap;
}
.page-tab.active { background: var(--accent); color: #000; border-color: var(--accent); }

/* Canvas container */
.canvas-container {
  flex: 1; position: relative;
  background: var(--bg-primary);
  overflow: hidden; touch-action: none;
  display: flex; align-items: center; justify-content: center;
}
.canvas-container canvas {
  max-width: 100%; max-height: 100%;
  image-rendering: auto;
}

.canvas-hint {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  color: var(--text-muted); pointer-events: none;
}
.canvas-hint .icon { font-size: 48px; margin-bottom: 12px; opacity: 0.4; }
.canvas-hint p { font-size: 14px; }

/* Panel overlays (drawn on canvas, but info panel below) */
.panel-info-bar {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 12px 16px; flex-shrink: 0;
}
.panel-info-bar.hidden { display: none; }

.panel-info-content {
  display: flex; align-items: center; gap: 12px;
}
.panel-info-label {
  font-size: 18px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #fbbf24);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; min-width: 40px;
}
.panel-info-details { flex: 1; }
.panel-info-details .barcode-value {
  font-size: 14px; font-weight: 600; color: var(--text-primary);
  font-family: 'Courier New', monospace;
}
.panel-info-details .scan-time {
  font-size: 11px; color: var(--text-muted);
}
.panel-info-status {
  width: 12px; height: 12px; border-radius: 50%;
}
.panel-info-status.scanned { background: var(--success); box-shadow: 0 0 8px rgba(16, 185, 129, 0.4); }
.panel-info-status.unscanned { background: var(--danger); opacity: 0.6; }

/* Bottom action bar */
.action-bar {
  display: flex; gap: 8px; padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border); flex-shrink: 0;
}

.action-btn {
  flex: 1; padding: 12px; border-radius: var(--radius-md);
  border: none; font-size: 14px; font-weight: 700;
  cursor: pointer; transition: all var(--transition);
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.action-btn-primary {
  background: linear-gradient(135deg, var(--accent), #d97706);
  color: #000;
}
.action-btn-primary:active { transform: scale(0.97); }
.action-btn-secondary {
  background: var(--bg-surface);
  color: var(--text-secondary); border: 1px solid var(--border);
}
.action-btn-secondary:active { transform: scale(0.97); }
.action-btn:disabled { opacity: 0.4; pointer-events: none; }

/* --- Scanner Modal --- */
.scanner-overlay {
  position: fixed; inset: 0;
  background: var(--bg-primary);
  z-index: 300; display: none;
  flex-direction: column;
}
.scanner-overlay.active { display: flex; }

.scanner-header {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.scanner-close {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: none; border: none; color: var(--text-primary);
  font-size: 24px; cursor: pointer; border-radius: var(--radius-sm);
}
.scanner-title { font-size: 16px; font-weight: 700; flex: 1; }

.scanner-tabs {
  display: flex; background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.scanner-tab {
  flex: 1; padding: 12px; text-align: center;
  background: none; border: none;
  color: var(--text-muted); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  border-bottom: 2px solid transparent;
}
.scanner-tab.active {
  color: var(--accent); border-bottom-color: var(--accent);
}

.scanner-camera-view {
  flex: 1; display: flex; align-items: center; justify-content: center;
  background: #000; position: relative;
}
.scanner-camera-view video { width: 100%; height: 100%; object-fit: cover; }

.scanner-manual {
  flex: 1; display: none; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 32px 24px; gap: 16px;
}
.scanner-manual.active { display: flex; }

.manual-input {
  width: 100%; max-width: 400px;
  padding: 16px 20px;
  background: var(--bg-surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 18px; font-weight: 600;
  font-family: 'Courier New', monospace;
  text-align: center; letter-spacing: 2px;
  transition: border-color var(--transition);
}
.manual-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}
.manual-input::placeholder {
  color: var(--text-muted); letter-spacing: normal; font-family: var(--font);
  font-weight: 400;
}

.manual-submit {
  width: 100%; max-width: 400px;
  padding: 14px; border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent), #d97706);
  border: none; color: #000;
  font-size: 16px; font-weight: 700;
  cursor: pointer; transition: all var(--transition);
}
.manual-submit:active { transform: scale(0.97); }

/* --- Modal --- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 400; display: flex;
  align-items: center; justify-content: center;
  padding: 24px; opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 24px; width: 100%; max-width: 360px;
  transform: scale(0.9); transition: transform 0.2s ease;
}
.modal-overlay.active .modal { transform: scale(1); }

.modal-title {
  font-size: 18px; font-weight: 700;
  margin-bottom: 12px;
}
.modal-body { color: var(--text-secondary); margin-bottom: 20px; font-size: 14px; }
.modal-body p { margin-bottom: 8px; }

.modal-input {
  width: 100%; padding: 12px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary); font-size: 15px;
  margin-top: 8px;
}
.modal-input:focus { outline: none; border-color: var(--accent); }

.modal-actions {
  display: flex; gap: 10px; justify-content: flex-end;
}
.modal-btn {
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: none; transition: all var(--transition);
}
.modal-btn-cancel {
  background: var(--bg-surface); color: var(--text-secondary);
}
.modal-btn-confirm {
  background: linear-gradient(135deg, var(--accent), #d97706); color: #000;
}

/* --- Toast --- */
.toast-container {
  position: fixed; bottom: 80px; left: 50%;
  transform: translateX(-50%);
  z-index: 500; display: flex;
  flex-direction: column; gap: 8px;
  pointer-events: none; width: 90%; max-width: 380px;
}
.toast {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  pointer-events: auto;
  transform: translateY(20px); opacity: 0;
  transition: all 0.3s ease;
  font-size: 14px;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--danger); }
.toast-warning { border-left: 3px solid var(--warning); }
.toast-info { border-left: 3px solid var(--info); }
.toast-icon { font-size: 18px; }
.toast-message { flex: 1; }

/* --- Loading Spinner --- */
.loading-overlay {
  position: absolute; inset: 0;
  background: rgba(10, 14, 26, 0.85);
  display: none; align-items: center; justify-content: center;
  flex-direction: column; gap: 16px; z-index: 50;
}
.loading-overlay.active { display: flex; }
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--text-secondary); font-size: 14px; }

/* --- Sensitivity slider --- */
.slider-group {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: none; flex-shrink: 0;
}
.slider-group.active { display: block; }
.slider-label {
  font-size: 12px; font-weight: 600; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px;
}
.slider-group input[type="range"] {
  width: 100%; accent-color: var(--accent);
}

/* --- Responsive --- */
@media (min-width: 768px) {
  .projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 960px; margin: 0 auto;
  }
}