/**
 * Responsive Mobile-First CSS for PHM
 */

:root {
  --primary-color: #8b5cf6;
  --primary-dark: #6d28d9;
  --success-color: #16a34a;
  --error-color: #dc2626;
  --warning-color: #ea580c;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --border-color: #e5e7eb;
  --background: #f9fafb;
  --card-bg: #ffffff;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========== HEADER ========== */

.header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow);
}

.header h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

.header-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 0.5rem;
}

.header-icon svg {
  width: 1.4em;
  height: 1.4em;
  fill: #93c5fd;
}

.header p {
  font-size: 0.95rem;
  opacity: 0.9;
}

/* ========== SUMMARY ========== */
.summary-section {
  max-width: 600px;
  margin: 0.75rem auto;
  width: 100%;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: center;
  align-items: center;
}

.summary-card {
  background: var(--card-bg);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  text-align: center;
}

.summary-title {
  font-weight: 700;
  color: var(--text-color);
}

.summary-items {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.summary-item {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  justify-content: center;
}

.summary-name {
  color: var(--text-light);
  font-weight: 600;
}

.summary-value {
  color: var(--primary-color);
  font-weight: 700;
}

/* Tabs for driver summary links */
.summary-tabs {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  justify-content: center;
}

.tab-link {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  border-radius: 0.375rem;
  background: transparent;
  color: var(--primary-dark);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
}

.tab-link:hover {
  background: rgba(99,102,241,0.08);
  border-color: rgba(99,102,241,0.18);
}

/* ========== MAIN ========== */

.main {
  flex: 1;
  padding: var(--spacing-lg);
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

/* ========== SECTIONS ========== */

section {
  margin-bottom: var(--spacing-2xl);
}

section h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--text-color);
}

.form-section h2,
.form-section h3 {
  text-align: center;
}

.section-divider {
  width: 100%;
  max-width: 220px;
  height: 1px;
  background-color: var(--border-color);
  margin: 0 auto 1.5rem;
}

/* ========== FORM ========== */

.form-section {
  background: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  margin-bottom: var(--spacing-2xl);
}

.form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-color);
  font-size: 0.95rem;
}

.form-group input,
.form-group select {
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ========== BUTTONS ========== */

.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: 0.375rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========== MESSAGES ========== */

.message {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: 0.375rem;
  font-size: 0.95rem;
  min-height: 1.5rem;
  display: none;
}

.message:not(:empty) {
  display: block;
  animation: slideIn 0.3s ease-out;
}

.message-success {
  background-color: rgba(22, 163, 74, 0.1);
  color: var(--success-color);
  border-left: 4px solid var(--success-color);
}

.message-error {
  background-color: rgba(220, 38, 38, 0.1);
  color: var(--error-color);
  border-left: 4px solid var(--error-color);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== STATISTICS & DRIVES LIST ========== */

.stats-section {
  background: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
}

.drives-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.drive-card {
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: var(--spacing-md);
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.drive-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.drive-driver {
  color: var(--primary-color);
  font-size: 1rem;
}

.drive-date {
  color: var(--text-light);
  font-size: 0.875rem;
}

.drive-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.detail-item {
  display: flex;
  flex-direction: column;
}

.detail-item .label {
  color: var(--text-light);
  font-size: 0.875rem;
  font-weight: 500;
}

.detail-item .value {
  color: var(--text-color);
  font-weight: 600;
  font-size: 1rem;
}

.detail-item .price {
  color: var(--success-color);
  font-size: 1.125rem;
}

.empty-state {
  text-align: center;
  color: var(--text-light);
  padding: var(--spacing-2xl) var(--spacing-lg);
}

/* ========== FOOTER ========== */

.footer {
  background-color: var(--text-color);
  color: white;
  text-align: center;
  padding: var(--spacing-lg);
  font-size: 0.875rem;
  margin-top: auto;
}

/* ========== TABLET (768px+) ========== */

@media (min-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }

  .main {
    max-width: 800px;
    padding: var(--spacing-2xl);
  }

  section h2 {
    font-size: 1.875rem;
  }

  .form-section,
  .stats-section {
    padding: var(--spacing-2xl);
  }

  .drive-details {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ========== DESKTOP (1024px+) ========== */

@media (min-width: 1024px) {
  .container {
    display: grid;
    grid-template-columns: 1fr;
  }

  .main {
    max-width: 900px;
  }
}

/* ========== ACCESSIBILITY ========== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #f3f4f6;
    --text-light: #d1d5db;
    --border-color: #374151;
    --background: #111827;
    --card-bg: #1f2937;
  }

  .drive-card {
    background: #111827;
    border-color: #374151;
  }

  .header {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  }
}