:root {
      --primary: #6366f1;
      --primary-light: #8b5cf6;
      --primary-dark: #4f46e5;
      --secondary: #06b6d4;
      --accent: #f59e0b;
      --success: #10b981;
      --danger: #ef4444;
      --warning: #f59e0b;
      
      --gray-50: #f8fafc;
      --gray-100: #f1f5f9;
      --gray-200: #e2e8f0;
      --gray-300: #cbd5e1;
      --gray-400: #94a3b8;
      --gray-500: #64748b;
      --gray-600: #475569;
      --gray-700: #334155;
      --gray-800: #1e293b;
      --gray-900: #0f172a;
      
      --text-primary: #1e293b;
      --text-secondary: #64748b;
      --text-muted: #94a3b8;
      --bg-primary: #ffffff;
      --bg-secondary: #f8fafc;
      --bg-tertiary: #f1f5f9;
      
      --border-light: #e2e8f0;
      --border-medium: #cbd5e1;
      
      --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
      --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
      --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
      --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
      
      --radius-sm: 0.375rem;
      --radius: 0.5rem;
      --radius-lg: 0.75rem;
      --radius-xl: 1rem;
      --radius-2xl: 1.5rem;
      
      --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
      --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    [data-theme="dark"] {
      --text-primary: #f8fafc;
      --text-secondary: #cbd5e1;
      --text-muted: #94a3b8;
      --bg-primary: #0f172a;
      --bg-secondary: #1e293b;
      --bg-tertiary: #334155;
      --border-light: #334155;
      --border-medium: #475569;
    }


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

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: var(--bg-secondary);
      color: var(--text-primary);
      line-height: 1.6;
      min-height: 100vh;
      transition: var(--transition-slow);
      overflow-x: hidden;
    }

    .header {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: white;
      padding: 2rem 1rem;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .header::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="0.5" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
      opacity: 0.3;
    }

    .header-content {
      position: relative;
      z-index: 1;
    }

    .header h1 {
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 700;
      margin-bottom: 0.5rem;
      letter-spacing: -0.025em;
    }

    .header p {
      font-size: 1.1rem;
      opacity: 0.9;
      font-weight: 400;
    }

    .theme-toggle {
      position: fixed;
      top: 1rem;
      right: 1rem;
      z-index: 1000;
      background: var(--bg-primary);
      border-radius: var(--radius-xl);
      padding: 0.5rem;
      box-shadow: var(--shadow-lg);
      transition: var(--transition);
    }

    .theme-toggle:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-xl);
    }

    .toggle-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 3rem;
      height: 3rem;
      border: none;
      background: transparent;
      cursor: pointer;
      border-radius: var(--radius-lg);
      font-size: 1.5rem;
      transition: var(--transition);
      color: var(--text-primary);
    }

    .toggle-btn:hover {
      background: var(--bg-tertiary);
      transform: scale(1.1);
    }

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

    .form-section {
      background: var(--bg-primary);
      margin: -2rem 1rem 2rem;
      border-radius: var(--radius-2xl);
      box-shadow: var(--shadow-xl);
      padding: 2rem;
      position: relative;
      z-index: 10;
      backdrop-filter: blur(10px);
    }

    .form-grid {
      display: grid;
      gap: 1.5rem;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .form-label {
      font-weight: 600;
      font-size: 0.875rem;
      color: var(--text-secondary);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .form-input, .form-select {
      padding: 0.875rem 1rem;
      border: 2px solid var(--border-light);
      border-radius: var(--radius-lg);
      background: var(--bg-primary);
      color: var(--text-primary);
      font-size: 1rem;
      transition: var(--transition);
      outline: none;
    }

    .form-input:focus, .form-select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    }

    .form-input:disabled, .form-select:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .days-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
      gap: 0.5rem;
    }

    .day-btn {
      padding: 0.75rem 0.5rem;
      border: 2px solid var(--border-light);
      border-radius: var(--radius-lg);
      background: var(--bg-primary);
      color: var(--text-secondary);
      cursor: pointer;
      text-align: center;
      font-weight: 500;
      font-size: 0.875rem;
      transition: var(--transition);
    }

    .day-btn:hover {
      border-color: var(--primary);
      background: rgba(99, 102, 241, 0.05);
    }

    .day-btn.active {
      background: var(--primary);
      border-color: var(--primary);
      color: white;
      transform: scale(1.05);
    }


    .checkbox-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1rem;
    }

    .checkbox-item {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.75rem;
      border-radius: var(--radius-lg);
      transition: var(--transition);
      cursor: pointer;
    }

    .checkbox-item:hover {
      background: var(--bg-tertiary);
    }

    .checkbox {
      width: 1.25rem;
      height: 1.25rem;
      border: 2px solid var(--border-medium);
      border-radius: var(--radius-sm);
      position: relative;
      flex-shrink: 0;
    }

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

    .checkbox input:checked + .checkmark {
      background: var(--primary);
      border-color: var(--primary);
    }

    .checkbox input:checked + .checkmark::after {
      content: '✓';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      color: white;
      font-size: 0.75rem;
      font-weight: bold;
    }

    .checkmark {
      position: absolute;
      inset: 0;
      border-radius: inherit;
      transition: var(--transition);
    }

    .submit-btn {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: white;
      border: none;
      padding: 1rem 2rem;
      border-radius: var(--radius-xl);
      font-size: 1.1rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.75rem;
      transition: var(--transition);
      box-shadow: var(--shadow);
      margin-top: 1rem;
    }

    .submit-btn:hover:not(:disabled) {
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .submit-btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
      transform: none;
    }

    .results {
      margin: 2rem 1rem;
      display: none;
    }

    .results.show {
      display: block;
      animation: slideUp 0.5s ease-out;
    }

    @keyframes slideUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .location-header {
      background: var(--bg-primary);
      border-radius: var(--radius-2xl);
      padding: 2rem;
      margin-bottom: 2rem;
      box-shadow: var(--shadow-lg);
      text-align: center;
    }

    .location-name {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.5rem;
    }

    .coordinates {
      display: flex;
      justify-content: center;
      gap: 1rem;
      margin-top: 1rem;
    }

    .coord-chip {
      background: var(--bg-tertiary);
      padding: 0.5rem 1rem;
      border-radius: var(--radius-xl);
      font-size: 0.875rem;
      color: var(--text-secondary);
      font-weight: 500;
    }

    .content-grid {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 2rem;
      align-items: start;
    }

    .map-section {
      background: var(--bg-primary);
      border-radius: var(--radius-2xl);
      padding: 1.5rem;
      box-shadow: var(--shadow-lg);
      height: fit-content;
    }

    .section-title {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-primary);
    }

    #map {
      height: 300px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
    }


.history-section {
  background: var(--bg-primary);
  margin: 1.5rem 1rem;
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.history-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
}

.history-list li {
  background: var(--bg-tertiary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
}

.history-list li:hover {
  background: var(--bg-secondary);
}

.history-list .remove-btn {
  color: var(--danger);
  font-weight: bold;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

    .weather-section {
      background: var(--bg-primary);
      border-radius: var(--radius-2xl);
      padding: 1.5rem;
      box-shadow: var(--shadow-lg);
    }

    .weather-grid {
      display: grid;
      gap: 1rem;
    }

    .weather-card {
      background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-xl);
      padding: 1.5rem;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .weather-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
    }

    .weather-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-xl);
      border-color: var(--primary);
    }

    .card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 1rem;
    }

    .card-date {
      font-weight: 600;
      color: var(--text-primary);
    }

    .card-icon {
      font-size: 2.5rem;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    }

    .card-temps {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1rem;
    }

    .temp-max {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--danger);
    }

    .temp-min {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--secondary);
    }

    .card-description {
      color: var(--text-secondary);
      margin-bottom: 1rem;
      font-weight: 500;
    }

    .card-details {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
    }

    .detail-chip {
      background: var(--bg-secondary);
      padding: 0.5rem 0.75rem;
      border-radius: var(--radius-lg);
      font-size: 0.875rem;
      color: var(--text-secondary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 500;
    }


    .loading, .error {
      text-align: center;
      padding: 3rem 2rem;
      background: var(--bg-primary);
      border-radius: var(--radius-2xl);
      box-shadow: var(--shadow-lg);
      margin: 2rem 1rem;
      display: none;
    }

    .loading.show, .error.show {
      display: block;
    }

    .spinner {
      width: 3rem;
      height: 3rem;
      border: 3px solid var(--border-light);
      border-top-color: var(--primary);
      border-radius: 50%;
      animation: spin 1s linear infinite;
      margin: 0 auto 1rem;
    }

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

    .error-icon {
      font-size: 3rem;
      margin-bottom: 1rem;
    }

    .retry-btn {
      background: var(--primary);
      color: white;
      border: none;
      padding: 0.75rem 1.5rem;
      border-radius: var(--radius-lg);
      cursor: pointer;
      font-weight: 600;
      margin-top: 1rem;
      transition: var(--transition);
    }

    .retry-btn:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

    /* === Responsive === */
    @media (max-width: 1024px) {
      .content-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 640px) {
      .form-section {
        margin: -1rem 0.5rem 1rem;
        padding: 1.5rem;
      }
      
      .checkbox-grid {
        grid-template-columns: 1fr;
      }
      
      .days-grid {
        grid-template-columns: repeat(4, 1fr);
      }
      
      .results {
        margin: 1rem 0.5rem;
      }
    }

    .hidden {
      display: none !important;
    }