/* assets/css/style.css */
/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

/* Color Palette & Tokens (Light Mode Default) */
:root {
  /* Colors */
  --canvas-bg: #F8FAFC;         /* Slate-50 */
  --surface-fill: #FFFFFF;      /* Card & Content */
  --surface-dark: #F1F5F9;      /* Form input background */
  --border-whisper: #E2E8F0;    /* Divider & borders (Slate-200) */
  --text-charcoal: #0F172A;     /* Primary text (Slate-900) */
  --text-muted: #64748B;        /* Secondary text (Slate-500) */

  /* Accents */
  --accent-slate: #334155;      /* Primary accent */
  --accent-slate-hover: #1E293B;
  --accent-slate-text: #FFFFFF;
  
  /* Semantics */
  --semantic-green: #059669;    /* Fuel logs / positive trends */
  --semantic-green-bg: #ECFDF5;
  --semantic-amber: #D97706;    /* Impending deadlines / alerts */
  --semantic-amber-bg: #FEF3C7;
  --semantic-red: #DC2626;      /* Overdue / actions needed */
  --semantic-red-bg: #FEF2F2;
  --semantic-blue: #2563EB;     /* Services / replacements */
  --semantic-blue-bg: #EFF6FF;

  /* Fonts */
  --font-family-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Typography Scale */
  --text-xs: clamp(0.75rem, 2vw, 0.8rem);     /* 12px */
  --text-sm: clamp(0.875rem, 2.2vw, 0.9rem);  /* 14px */
  --text-base: clamp(1rem, 2.5vw, 1.05rem);   /* 16px */
  --text-md: clamp(1.125rem, 3vw, 1.25rem);   /* 18px-20px */
  --text-lg: clamp(1.35rem, 4vw, 1.5rem);     /* 22px-24px */
  --text-xl: clamp(1.8rem, 6vw, 2.2rem);      /* 28px-32px */

  /* Spacing */
  --space-xxs: 0.25rem;  /* 4px */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 0.75rem;   /* 12px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */

  /* Radius */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1.25rem;   /* 20px */
  --radius-full: 9999px;

  /* Shadow & Focus */
  --shadow-diffused: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-focus: 0 0 0 3px rgba(51, 65, 85, 0.15);
  
  /* Layout */
  --nav-bg: rgba(255, 255, 255, 0.85);
  --backdrop-outside: #0F172A; /* Slate-900 backdrop for desktop layout */
}

/* Dark Mode Calibration */
@media (prefers-color-scheme: dark) {
  :root {
    --canvas-bg: #0B0F19;
    --surface-fill: #131A26;
    --surface-dark: #1E2638;
    --border-whisper: #232D42;
    --text-charcoal: #F1F5F9;
    --text-muted: #94A3B8;

    --accent-slate: #94A3B8;
    --accent-slate-hover: #CBD5E1;
    --accent-slate-text: #0B0F19;

    --semantic-green: #34D399;
    --semantic-green-bg: rgba(52, 211, 153, 0.1);
    --semantic-amber: #FBBF24;
    --semantic-amber-bg: rgba(251, 191, 36, 0.1);
    --semantic-red: #F87171;
    --semantic-red-bg: rgba(248, 113, 113, 0.1);
    --semantic-blue: #60A5FA;
    --semantic-blue-bg: rgba(96, 165, 250, 0.1);

    --shadow-diffused: 0 4px 25px rgba(0, 0, 0, 0.4);
    --shadow-focus: 0 0 0 3px rgba(148, 163, 184, 0.25);
    
    --nav-bg: rgba(19, 26, 38, 0.85);
    --backdrop-outside: #05070B;
  }
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--backdrop-outside);
  font-family: var(--font-family-sans);
  color: var(--text-charcoal);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
}

/* Desktop App Containment & Wrapping */
.app-container {
  width: 100%;
  max-width: 540px; /* Mobile mock aspect */
  min-height: 100vh;
  background-color: var(--canvas-bg);
  position: relative;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-diffused);
  padding-bottom: 80px; /* Safe zone bottom-nav */
}

/* Typography & Layout Spacing */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em; /* Track-tight */
}

p {
  line-height: 1.5;
  max-width: 65ch; /* Limit reading line-width */
}

/* App Header */
.app-header {
  padding: var(--space-md) var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-whisper);
  background: var(--surface-fill);
}

.app-title {
  font-size: var(--text-lg);
  color: var(--text-charcoal);
}

/* App Main Content Area */
main {
  flex: 1;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Bottom Navigation Bar */
.bottom-nav {
  position: fixed;
  bottom: 0;
  width: 100%;
  max-width: 540px;
  height: 64px;
  background-color: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-whisper);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 100;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: 500;
  gap: var(--space-xxs);
  cursor: pointer;
  background: none;
  border: none;
  height: 100%;
  flex: 1;
  transition: color 0.2s ease;
}

.nav-item svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.nav-item.active {
  color: var(--text-charcoal);
}

/* Floating Action Button (FAB) */
.nav-fab-wrap {
  position: relative;
  width: 56px;
  height: 56px;
}

.fab-button {
  position: absolute;
  top: -24px;
  left: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background-color: var(--accent-slate);
  color: var(--accent-slate-text);
  border: none;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.fab-button svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2.5;
}

.fab-button:active {
  transform: scale(0.92) translateY(2px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

/* Cards Design System */
.card {
  background-color: var(--surface-fill);
  border: 1px solid var(--border-whisper);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-diffused);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-clickable:active {
  transform: scale(0.98);
}

/* KPI Dashboard Cards */
.kpi-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.kpi-card {
  padding: var(--space-md);
}

.kpi-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kpi-value {
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--text-charcoal);
  font-family: var(--font-family-mono); /* Monospace numbers */
  margin-top: var(--space-xxs);
}

.kpi-card.full-width {
  grid-column: span 2;
}

.kpi-value-large {
  font-size: var(--text-xl);
}

/* Form Styles */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.form-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background-color: var(--surface-dark);
  border: 1px solid var(--border-whisper);
  border-radius: var(--radius-md);
  color: var(--text-charcoal);
  font-family: var(--font-family-sans);
  font-size: var(--text-base);
  transition: all 0.2s ease;
}

.form-input:focus {
  outline: none;
  background-color: var(--surface-fill);
  border-color: var(--accent-slate);
  box-shadow: var(--shadow-focus);
}

/* Segmented Control / Chip Selection (No Dropdown for <=4 options) */
.chip-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.chip {
  padding: 10px 16px;
  border-radius: var(--radius-full);
  background-color: var(--surface-dark);
  border: 1px solid var(--border-whisper);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.chip.active {
  background-color: var(--accent-slate);
  color: var(--accent-slate-text);
  border-color: var(--accent-slate);
}

.chip:active {
  transform: scale(0.95);
}

/* Buttons */
.btn {
  width: 100%;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-xs);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--accent-slate);
  color: var(--accent-slate-text);
}

.btn-primary:active {
  transform: scale(0.97);
  background-color: var(--accent-slate-hover);
}

.btn-secondary {
  background-color: var(--surface-dark);
  color: var(--text-charcoal);
  border: 1px solid var(--border-whisper);
}

.btn-secondary:active {
  transform: scale(0.97);
}

.btn-danger {
  background-color: var(--semantic-red);
  color: #FFFFFF;
}

.btn-danger:active {
  transform: scale(0.97);
}

/* Semantics Alerts & Status Badges */
.alert {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border-left: 4px solid transparent;
  display: flex;
  gap: var(--space-sm);
}

.alert-amber {
  background-color: var(--semantic-amber-bg);
  border-left-color: var(--semantic-amber);
  color: var(--semantic-amber);
}

.alert-red {
  background-color: var(--semantic-red-bg);
  border-left-color: var(--semantic-red);
  color: var(--semantic-red);
}

.alert-green {
  background-color: var(--semantic-green-bg);
  border-left-color: var(--semantic-green);
  color: var(--semantic-green);
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 600;
}

.badge-green { background-color: var(--semantic-green-bg); color: var(--semantic-green); }
.badge-blue { background-color: var(--semantic-blue-bg); color: var(--semantic-blue); }
.badge-amber { background-color: var(--semantic-amber-bg); color: var(--semantic-amber); }
.badge-red { background-color: var(--semantic-red-bg); color: var(--semantic-red); }

/* Timeline History */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.timeline-item {
  border-left: 2px solid var(--border-whisper);
  padding-left: var(--space-md);
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}

.timeline-dot.fuel { background-color: var(--semantic-green); }
.timeline-dot.service { background-color: var(--semantic-blue); }
.timeline-dot.part { background-color: var(--accent-slate); }

.timeline-meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-family-mono);
}

/* Skeleton Loading Shimmer */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(90deg, var(--surface-dark) 25%, var(--border-whisper) 50%, var(--surface-dark) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.skeleton-text {
  height: 1rem;
  width: 80%;
  margin-bottom: var(--space-xs);
}

.skeleton-card {
  height: 120px;
  width: 100%;
  border-radius: var(--radius-lg);
}

/* Toast Alert Style */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background-color: var(--accent-slate);
  color: var(--accent-slate-text);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  font-size: var(--text-sm);
  font-weight: 500;
  opacity: 0;
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Tab/Views utility visibility classes */
.view-panel {
  display: none;
}

.view-panel.active {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}