/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Variables for Light/Dark Mode */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f8fafc;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-primary: #e5e7eb;
    --border-secondary: #d1d5db;
    --accent-primary: #3B82F6;
    --accent-hover: #1D4ED8;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --gradient-hero: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-primary: #374151;
    --border-secondary: #4b5563;
    --accent-primary: #60a5fa;
    --accent-hover: #3b82f6;
    --success: #34d399;
    --warning: #fbbf24;
    --error: #f87171;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --gradient-hero: linear-gradient(135deg, #1f2937 0%, #111827 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-weight: 400;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px var(--shadow-light);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.main-nav a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.main-nav a:hover {
    color: var(--accent-primary);
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 50px;
    width: 50px;
    height: 28px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    padding: 2px;
}

.dark-mode-toggle:hover {
    border-color: var(--accent-primary);
}

.dark-mode-toggle::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    transition: transform 0.3s ease;
    transform: translateX(0);
}

[data-theme="dark"] .dark-mode-toggle::before {
    transform: translateX(18px);
}

.dark-mode-toggle .toggle-icon {
    position: absolute;
    font-size: 12px;
    transition: opacity 0.3s ease;
}

.dark-mode-toggle .sun-icon {
    left: 6px;
    opacity: 1;
}

.dark-mode-toggle .moon-icon {
    right: 6px;
    opacity: 0;
}

[data-theme="dark"] .dark-mode-toggle .sun-icon {
    opacity: 0;
}

[data-theme="dark"] .dark-mode-toggle .moon-icon {
    opacity: 1;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-secondary);
    margin: 2px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    padding: 4rem 0;
    text-align: center;
    transition: background 0.3s ease;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Search Container */
.search-container {
    max-width: 500px;
    margin: 0 auto;
    position: relative;
}

.search-container input {
    width: 100%;
    padding: 1rem 3.5rem 1rem 1.5rem;
    border: 2px solid var(--border-primary);
    border-radius: 50px;
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-container input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-container button {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--accent-primary);
    border: none;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.search-container button:hover {
    background: var(--accent-hover);
}

/* Filters */
.filters {
    padding: 2rem 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.filter-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border-primary);
    border-radius: 50px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    color: white;
}

/* Calculator Grid */
.calculators {
    padding: 3rem 0;
    background: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.calculator-card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px var(--shadow-light);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease;
    border: 1px solid var(--border-primary);
}

.calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-medium);
}

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

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    transition: background-color 0.3s ease;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.card-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #e0f2fe;
    color: #0369a1;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.card-category.home { background: #fef3c7; color: #92400e; }
.card-category.automotive { background: #dcfce7; color: #166534; }
.card-category.finance { background: #e0e7ff; color: #3730a3; }
.card-category.gaming { background: #fce7f3; color: #9d174d; }
.card-category.science { background: #f0fdf4; color: #15803d; }
.card-category.marine { background: #cffafe; color: #0e7490; }
.card-category.gardening { background: #ecfdf5; color: #047857; }

[data-theme="dark"] .card-category {
    background: rgba(224, 242, 254, 0.2);
    color: #7dd3fc;
}

[data-theme="dark"] .card-category.home { background: rgba(254, 243, 199, 0.2); color: #fbbf24; }
[data-theme="dark"] .card-category.automotive { background: rgba(220, 252, 231, 0.2); color: #4ade80; }
[data-theme="dark"] .card-category.finance { background: rgba(224, 231, 255, 0.2); color: #a5b4fc; }
[data-theme="dark"] .card-category.gaming { background: rgba(252, 231, 243, 0.2); color: #f472b6; }
[data-theme="dark"] .card-category.science { background: rgba(240, 253, 244, 0.2); color: #4ade80; }
[data-theme="dark"] .card-category.marine { background: rgba(207, 250, 254, 0.2); color: #22d3ee; }
[data-theme="dark"] .card-category.gardening { background: rgba(236, 253, 245, 0.2); color: #34d399; }

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.card-link:hover {
    color: var(--accent-hover);
}

/* Calculator Page Styles */
.calculator-page {
    padding: 2rem 0;
    background: var(--bg-secondary);
    min-height: calc(100vh - 200px);
    transition: background-color 0.3s ease;
}

.calculator-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 12px var(--shadow-light);
    border: 1px solid var(--border-primary);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.calculator-header {
    text-align: center;
    margin-bottom: 2rem;
}

.calculator-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.calculator-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Form Styles */
.calculator-form {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-primary);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input.error {
    border-color: var(--error);
}

.form-help {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-primary:disabled {
    background: var(--text-tertiary);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
}

.btn-secondary:hover {
    background: var(--border-primary);
}

/* Results */
.result-container {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #f0f9ff;
    border: 2px solid #0ea5e9;
    border-radius: 12px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .result-container {
    background: rgba(240, 249, 255, 0.1);
    border-color: #0ea5e9;
}

.result-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #0c4a6e;
    margin-bottom: 1rem;
}

[data-theme="dark"] .result-title {
    color: #7dd3fc;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #0c4a6e;
    margin-bottom: 0.5rem;
}

[data-theme="dark"] .result-value {
    color: #7dd3fc;
}

.result-description {
    color: #075985;
    font-size: 0.9rem;
}

[data-theme="dark"] .result-description {
    color: #bae6fd;
}

/* Formula Section */
.formula-section {
    margin: 2rem 0;
}

.formula-container {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.5rem;
    border-left: 4px solid var(--accent-primary);
    transition: background-color 0.3s ease;
}

.formula {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--text-primary);
    transition: background-color 0.3s ease;
}

.formula-explanation ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.formula-explanation li {
    color: var(--text-secondary);
}

/* Garden Calculator Specific */
.plant-filters {
    margin-bottom: 2rem;
}

.plant-search {
    margin-bottom: 1rem;
}

.plant-categories {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.category-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-primary);
    border-radius: 20px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.category-btn.active,
.category-btn:hover {
    border-color: var(--success);
    background: var(--success);
    color: white;
}

.plant-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.plant-card {
    border: 2px solid var(--border-primary);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-primary);
}

.plant-card:hover,
.plant-card.selected {
    border-color: var(--success);
    background: #f0fdf4;
}

[data-theme="dark"] .plant-card:hover,
[data-theme="dark"] .plant-card.selected {
    background: rgba(240, 253, 244, 0.1);
}

.plant-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: block;
}

.plant-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.modifiers-section {
    margin: 2rem 0;
}

.modifiers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
}

.modifier-card {
    border: 2px solid var(--border-primary);
    border-radius: 8px;
    padding: 0.75rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-primary);
}

.modifier-card:hover,
.modifier-card.selected {
    border-color: var(--warning);
    background: #fffbeb;
}

[data-theme="dark"] .modifier-card:hover,
[data-theme="dark"] .modifier-card.selected {
    background: rgba(255, 251, 235, 0.1);
}

.modifier-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    display: block;
}

.modifier-name {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}

.friend-boost {
    margin: 1.5rem 0;
}

.slider-container {
    margin-top: 0.5rem;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-primary);
    outline: none;
    -webkit-appearance: none;
    transition: background-color 0.3s ease;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
}

.slider-value {
    text-align: center;
    font-weight: 600;
    color: var(--accent-primary);
    margin-top: 0.5rem;
}

/* How to Use Section */
.how-to-use {
    margin: 3rem 0;
    padding: 2rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
    transition: background-color 0.3s ease;
}

.how-to-use h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.how-to-use ol {
    padding-left: 1.5rem;
}

.how-to-use li {
    margin-bottom: 0.75rem;
    line-height: 1.6;
    color: var(--text-primary);
}

/* Related Tools */
.related-tools {
    margin: 3rem 0;
}

.related-tools h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-primary);
}

/* FAQ */
.faq {
    padding: 4rem 0;
    background: var(--bg-primary);
    transition: background-color 0.3s ease;
}

.faq h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--text-primary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-primary);
    transition: border-color 0.3s ease;
}

.faq-question {
    width: 100%;
    padding: 1.5rem 0;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.faq-question:hover {
    color: var(--accent-primary);
}

.faq-icon {
    transition: transform 0.2s ease;
    flex-shrink: 0;
    margin-left: 1rem;
    color: var(--text-secondary);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer.active {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 0 1.5rem 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.site-footer {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border-primary);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.footer-section a:hover {
    color: var(--accent-primary);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.social-links a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-primary);
    padding-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    transition: border-color 0.3s ease;
}

.footer-bottom p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .filter-buttons {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .plant-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .modifiers-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }

    .header-actions {
        gap: 0.5rem;
    }

    .dark-mode-toggle {
        width: 45px;
        height: 25px;
    }

    .dark-mode-toggle::before {
        width: 17px;
        height: 17px;
    }

    [data-theme="dark"] .dark-mode-toggle::before {
        transform: translateX(16px);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 2rem 0;
    }
    
    .calculator-container {
        padding: 1rem;
        margin: 0 0.5rem;
    }
    
    .filter-btn {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
}

/* Loading and Animation */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-primary);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    transition: border-color 0.3s ease;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility Classes */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 0.5rem !important; }
.mb-2 { margin-bottom: 1rem !important; }
.mt-2 { margin-top: 1rem !important; }
.p-0 { padding: 0 !important; }