:root {
  --primary-color: #1e3a5f;
  --bg-color: #f5f7fa;
  --card-bg: #ffffff;
  --text-main: #333333;
  --text-muted: #666666;
  --border-color: #e0e0e0;
  --radius: 12px;
  --success-color: #4caf50;
  --warning-color: #ff9800;
  --error-color: #d32f2f;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 0;
  padding-bottom: 40px;
}

/* Header */
.header {
  background-color: var(--card-bg);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 10;
}

/* Hamburger Menu Button */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--primary-color);
  z-index: 101;
}

.hamburger-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile Nav Overlay */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
}

.nav-overlay.open {
  display: block;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo {
  font-weight: 800;
  font-size: 20px;
  color: var(--primary-color);
}

.brand-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.2;
}

.lang-switcher {
  margin-left: auto;
  margin-right: 16px;
}
.lang-switcher select {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  font-size: 14px;
  cursor: pointer;
}
.lang-switcher select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logout-btn {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
}

/* Layout Container */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 16px 12px;
}

h1 {
  font-size: 24px;
  margin-top: 0;
  margin-bottom: 24px;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 14px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(30, 58, 95, 0.2);
  transition: transform 0.2s;
}

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

.btn-block {
  display: block;
  width: 100%;
  box-sizing: border-box;
}

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--text-main);
  text-align: center;
  padding: 14px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-secondary:hover {
  background-color: #f0f0f0;
}

/* Lists & Cards */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  border: 1px solid var(--border-color);
}

.card-title {
  font-weight: 600;
  margin-bottom: 4px;
  font-size: 15px;
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.empty-state {
  text-align: center;
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 14px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px dashed var(--border-color);
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 14px;
}

.form-control {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 16px;
  box-sizing: border-box;
  background-color: var(--card-bg);
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

.form-actions .btn-primary, .form-actions .btn-secondary {
  flex: 1;
}

/* Navigation inside admin */
.admin-nav {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  overflow-x: auto;
  padding-top: 12px;
  padding-bottom: 12px;
  -webkit-overflow-scrolling: touch;
  position: sticky;
  top: 64px;
  z-index: 9;
  background-color: var(--bg-color);
  margin-top: -12px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  white-space: nowrap;
  padding: 10px 16px;
  background-color: var(--card-bg);
  border-radius: 20px;
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.nav-link.active {
  color: white;
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  font-weight: 600;
}

/* Dashboard Specific Styles */
.btn-new-contract {
  display: block;
  width: 100%;
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 16px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 32px;
  box-shadow: 0 4px 10px rgba(30, 58, 95, 0.2);
  transition: transform 0.2s;
  box-sizing: border-box;
}

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

.section-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-main);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.stat-card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  border: 1px solid var(--border-color);
}

.stat-number {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--primary-color);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
}

.contracts-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contract-card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 12px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  border: 1px solid var(--border-color);
  gap: 8px;
}

.contract-info {
  flex: 1;
}

.contract-customer {
  font-weight: 600;
  margin-bottom: 4px;
  font-size: 15px;
}

.contract-bike {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-active .status-dot { background-color: var(--success-color); }
.status-signed .status-dot { background-color: var(--success-color); }
.status-awaiting .status-dot { background-color: var(--warning-color); }

.contract-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.action-btn {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background-color: var(--bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border-color);
}

.action-btn svg {
  width: 16px;
  height: 16px;
}

/* ===== Mobile Responsive ===== */
@media (max-width: 480px) {
  .header {
    padding: 10px 12px;
  }

  .brand-logo {
    font-size: 18px;
  }

  .brand-text {
    font-size: 12px;
  }

  .container {
    padding: 12px 10px;
  }

  h1 {
    font-size: 20px;
    margin-bottom: 16px;
  }

  /* Hamburger visible on mobile */
  .hamburger-btn {
    display: flex;
    align-items: center;
  }

  /* Admin nav becomes slide-down overlay */
  .admin-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background-color: var(--card-bg);
    z-index: 100;
    padding: 60px 24px 24px;
    gap: 8px;
    margin: 0;
    overflow-y: auto;
    animation: slideDown 0.2s ease-out;
  }

  .admin-nav.open {
    display: flex;
  }

  .nav-link {
    font-size: 16px;
    padding: 14px 16px;
    border-radius: 10px;
    text-align: left;
  }

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

  .stats-grid {
    gap: 8px;
    margin-bottom: 20px;
  }

  .stat-card {
    padding: 10px 6px;
  }

  .stat-number {
    font-size: 20px;
  }

  .stat-label {
    font-size: 11px;
  }

  .btn-primary {
    padding: 12px 16px;
    font-size: 15px;
  }

  .contract-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 10px;
  }

  .contract-info {
    width: 100%;
  }

  .contract-actions {
    width: 100%;
    justify-content: flex-start;
    padding-top: 6px;
    border-top: 1px solid var(--border-color);
  }

  .action-btn {
    width: 32px;
    height: 32px;
  }

  .action-btn svg {
    width: 14px;
    height: 14px;
  }

  .section-title {
    font-size: 14px;
  }
}

/* Login Specific Styles */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  background-color: var(--bg-color);
  box-sizing: border-box;
}

.login-card {
  background-color: var(--card-bg);
  width: 100%;
  max-width: 400px;
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
  box-sizing: border-box;
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-header h1 {
  color: var(--primary-color);
  font-size: 28px;
  margin-bottom: 8px;
  font-weight: 800;
}

.login-header p {
  color: var(--text-muted);
  margin: 0;
  font-size: 14px;
}