/* CSS Variables for Theme Management */
:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    --border-color: #475569;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

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

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header Styles */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.stats {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

.separator {
    width: 1px;
    height: 2rem;
    background: var(--border-color);
}

.sort-controls, .view-controls {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-primary);
    padding: 0.25rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.control-btn {
    padding: 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.control-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
}

.control-btn.primary {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
}

.control-btn.primary:hover {
    background: #5856eb;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Collapsible Form Styles */
.add-section {
    margin-bottom: 2rem;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    max-height: 500px;
    opacity: 1;
}

.add-section.collapsed {
    max-height: 0;
    opacity: 0;
    margin-bottom: 0;
}

.form-container {
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem 0;
}

.form-header h2 {
    margin-bottom: 0;
    color: var(--text-primary);
    font-weight: 600;
}

.close-btn {
    padding: 0.5rem;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: var(--danger-color);
    color: white;
}

.link-form {
    padding: 1.5rem 2rem 2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 2fr 2fr 1.5fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

/* Form Styles */
.form-group {
    position: relative;
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.form-actions {
    display: flex;
    gap: 0.5rem;
}

.form-actions button {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.submit-btn:hover {
    background: #5856eb;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.cancel-btn {
    background: var(--text-tertiary);
    color: white;
}

.cancel-btn:hover {
    background: var(--text-secondary);
}

/* Links Container */
.links-section {
    margin-bottom: 2rem;
}

.links-container {
    min-height: 400px;
}

.links-container.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    max-width: 100%;
}

.links-container.list-view {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Link Card Styles */
.link-card {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    height: 200px;
    display: flex;
    flex-direction: column;
}

.link-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.link-card.list-view {
    height: auto;
    flex-direction: row;
    align-items: center;
    padding: 1rem;
}

.card-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.3;
}

.card-content {
    position: relative;
    z-index: 2;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 100%);
}

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

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
    margin-bottom: 0.5rem;
}

.card-url {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    word-break: break-all;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.link-card:hover .card-actions {
    opacity: 1;
}

.action-btn {
    padding: 0.5rem;
    border: none;
    background: rgba(255,255,255,0.2);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.action-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.05);
}

.action-btn.delete:hover {
    background: var(--danger-color);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: rgba(255,255,255,0.7);
}

.visit-count {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding: 1rem;
}

.page-btn {
    padding: 0.75rem 1rem;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.page-btn:not(:disabled):hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

/* Confirmation Overlay */
.confirm-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.confirm-box {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
    text-align: center;
}

.confirm-icon {
    margin-bottom: 1rem;
}

.confirm-icon i {
    font-size: 3rem;
    color: var(--warning-color);
}

.confirm-box h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.confirm-box p {
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.confirm-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.confirm-actions button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.delete-btn:hover {
    background: #dc2626;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .header-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .links-container.grid-view {
        grid-template-columns: 1fr;
    }
    
    .title {
        font-size: 1.5rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.link-card {
    animation: fadeIn 0.5s ease;
}

/* Soft Delete Styles */
.link-card.soft-deleted {
    opacity: 0.5;
    transform: scale(0.95);
}

.link-card.soft-deleted .card-content {
    background: linear-gradient(135deg, rgba(239,68,68,0.7) 0%, rgba(239,68,68,0.3) 100%);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Notifications */
.notification {
    position: fixed;
    top: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    animation: slideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notification.success { background: var(--success-color); }
.notification.error { background: var(--danger-color); }
.notification.info { background: var(--primary-color); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}