/* Tesla-inspired Design System */
:root {
  --tesla-black: #000000;
  --tesla-dark-gray: #171a20;
  --tesla-medium-gray: #393c41;
  --tesla-light-gray: #5c5e62;
  --tesla-white: #ffffff;
  --tesla-red: #e31937;
  --tesla-blue: #3498db;
  --tesla-green: #00d563;
  --tesla-orange: #ff6b35;
  --tesla-background: #f8f9fa;
  --tesla-card-bg: #ffffff;
  
  --border-radius: 12px;
  --border-radius-large: 20px;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.2);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

/* Reset & Base Styles */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--tesla-background);
  color: var(--tesla-dark-gray);
  line-height: 1.6;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  font-size: 16px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  margin: 0 0 1rem 0;
  color: var(--tesla-black);
}

h1 {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  font-weight: 400;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin: 0 0 1rem 0;
  color: var(--tesla-medium-gray);
}

/* Layout */
.tesla-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.tesla-grid {
  display: grid;
  gap: 2rem;
}

.tesla-flex {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Cards */
.tesla-card {
  background: var(--tesla-card-bg);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.tesla-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tesla-card-large {
  border-radius: var(--border-radius-large);
  padding: 3rem;
}

/* Buttons */
.tesla-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  min-height: 48px;
  position: relative;
  overflow: hidden;
  background: transparent;
  outline: none;
}

.tesla-btn:focus {
  outline: 2px solid var(--tesla-blue);
  outline-offset: 2px;
}

.tesla-btn-primary {
  background: var(--tesla-black);
  color: var(--tesla-white);
}

.tesla-btn-primary:hover {
  background: var(--tesla-dark-gray);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.tesla-btn-secondary {
  background: transparent;
  color: var(--tesla-black);
  border: 2px solid var(--tesla-black);
}

.tesla-btn-secondary:hover {
  background: var(--tesla-black);
  color: var(--tesla-white);
}

.tesla-btn-danger {
  background: var(--tesla-red);
  color: var(--tesla-white);
}

.tesla-btn-danger:hover {
  background: #c41230;
}

.tesla-btn-success {
  background: var(--tesla-green);
  color: var(--tesla-white);
}

.tesla-btn-success:hover {
  background: #00b84f;
}

.tesla-btn-large {
  padding: 1rem 3rem;
  font-size: 1.1rem;
  min-height: 56px;
}

.tesla-btn-full {
  width: 100%;
}

/* Form Elements */
.tesla-form-group {
  margin-bottom: 1.5rem;
}

.tesla-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--tesla-black);
  font-weight: 500;
  font-size: 0.9rem;
}

.tesla-input,
.tesla-select,
.tesla-textarea {
  width: 100%;
  padding: 1rem;
  border: 2px solid #e5e7eb;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--tesla-white);
  color: var(--tesla-black);
}

.tesla-input:focus,
.tesla-select:focus,
.tesla-textarea:focus {
  outline: none;
  border-color: var(--tesla-blue);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.tesla-textarea {
  resize: vertical;
  min-height: 100px;
}

/* Range Slider */
.tesla-range {
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: #e5e7eb;
  outline: none;
  opacity: 0.7;
  transition: opacity 0.2s;
  appearance: none;
}

.tesla-range:hover {
  opacity: 1;
}

.tesla-range::-webkit-slider-thumb {
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--tesla-black);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.tesla-range::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

.tesla-range::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--tesla-black);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
}

/* Checkbox */
.tesla-checkbox {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: 1rem;
  cursor: pointer;
}

.tesla-checkbox input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
}

.tesla-checkbox .checkmark {
  height: 20px;
  width: 20px;
  background-color: transparent;
  border: 2px solid #e5e7eb;
  border-radius: 4px;
  margin-right: 12px;
  margin-top: 2px;
  transition: var(--transition);
  flex-shrink: 0;
}

.tesla-checkbox:hover .checkmark {
  border-color: var(--tesla-blue);
}

.tesla-checkbox input:checked ~ .checkmark {
  background-color: var(--tesla-black);
  border-color: var(--tesla-black);
}

.tesla-checkbox .checkmark:after {
  content: "";
  position: absolute;
  display: none;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.tesla-checkbox input:checked ~ .checkmark:after {
  display: block;
}

.tesla-checkbox-label {
  color: var(--tesla-medium-gray);
  font-size: 0.9rem;
  line-height: 1.4;
}

/* Navigation */
.tesla-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--tesla-white);
  padding: 1rem;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 1000;
}

.tesla-nav-content {
  display: flex;
  justify-content: center;
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.tesla-nav-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  text-decoration: none;
  color: var(--tesla-black);
  font-weight: 500;
  transition: var(--transition);
  border: 2px solid transparent;
}

.tesla-nav-item:hover {
  background: var(--tesla-background);
  color: var(--tesla-black);
  text-decoration: none;
}

.tesla-nav-item.active {
  background: var(--tesla-black);
  color: var(--tesla-white);
}

.tesla-nav-item i {
  font-size: 1.2rem;
}

/* Welcome Screen */
.tesla-welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 2rem;
  background: linear-gradient(135deg, var(--tesla-background) 0%, #e8f4fd 100%);
}

.tesla-welcome-content {
  max-width: 500px;
}

.tesla-welcome h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--tesla-black) 0%, var(--tesla-medium-gray) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tesla-welcome p {
  font-size: 1.2rem;
  margin-bottom: 3rem;
  color: var(--tesla-light-gray);
}

/* Icons */
.tesla-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--tesla-blue) 0%, var(--tesla-green) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: white;
  font-size: 24px;
}

.tesla-icon-large {
  width: 100px;
  height: 100px;
  font-size: 40px;
  margin-bottom: 2rem;
}

/* Gauge Meter */
.tesla-gauge-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 2rem 0;
}

.tesla-gauge {
  position: relative;
  margin-bottom: 1rem;
}

.tesla-gauge-label {
  text-align: center;
  color: var(--tesla-medium-gray);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Vehicle Status */
.tesla-vehicle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.tesla-vehicle-card {
  background: var(--tesla-white);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.tesla-vehicle-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* Success/Error States */
.tesla-success {
  background: linear-gradient(135deg, var(--tesla-green) 0%, #00b84f 100%);
  color: white;
  padding: 3rem 2rem;
  border-radius: var(--border-radius-large);
  text-align: center;
  margin: 2rem 0;
}

.tesla-error {
  background: linear-gradient(135deg, var(--tesla-red) 0%, #c41230 100%);
  color: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  margin: 1rem 0;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.tesla-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.tesla-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* Loading States */
.tesla-loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .tesla-container {
    padding: 0 0.75rem;
  }
  
  .tesla-card {
    padding: 1.5rem;
  }
  
  .tesla-card-large {
    padding: 2rem;
  }
  
  .tesla-welcome h1 {
    font-size: 2.5rem;
  }
  
  .tesla-nav-content {
    gap: 0.5rem;
  }
  
  .tesla-nav-item {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  
  .tesla-btn {
    padding: 0.75rem 1.5rem;
  }
  
  .tesla-btn-large {
    padding: 1rem 2rem;
  }
  
  .tesla-vehicle-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .tesla-welcome h1 {
    font-size: 2rem;
  }
  
  .tesla-welcome p {
    font-size: 1rem;
  }
  
  .tesla-nav-item span {
    display: none;
  }
  
  .tesla-card {
    padding: 1rem;
  }
}

/* Utility Classes */
.tesla-text-center { text-align: center; }
.tesla-text-left { text-align: left; }
.tesla-text-right { text-align: right; }

.tesla-mt-1 { margin-top: 0.5rem; }
.tesla-mt-2 { margin-top: 1rem; }
.tesla-mt-3 { margin-top: 1.5rem; }
.tesla-mt-4 { margin-top: 2rem; }

.tesla-mb-1 { margin-bottom: 0.5rem; }
.tesla-mb-2 { margin-bottom: 1rem; }
.tesla-mb-3 { margin-bottom: 1.5rem; }
.tesla-mb-4 { margin-bottom: 2rem; }

.tesla-hidden { display: none; }
.tesla-block { display: block; }

.tesla-text-success { color: var(--tesla-green); }
.tesla-text-danger { color: var(--tesla-red); }
.tesla-text-warning { color: var(--tesla-orange); }
.tesla-text-info { color: var(--tesla-blue); }

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --tesla-background: #1a1a1a;
    --tesla-card-bg: #2a2a2a;
    --tesla-black: #ffffff;
    --tesla-dark-gray: #f0f0f0;
    --tesla-medium-gray: #cccccc;
  }
}