:root {
    --color-primary: #7c3aed;
    --color-primary-light: #a78bfa;
    --color-primary-dark: #5b21b6;
    --color-secondary: #ec4899;
    --color-success: #22c55e;
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    --bg-gradient-1: #0f172a;
    --bg-gradient-2: #1e1b4b;
    --bg-surface: #1e293b;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Poppins', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.app-wrapper {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem;
}

.app-header {
    background: var(--bg-surface);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.brand {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    letter-spacing: -1px;
}

.main-navigation {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.75rem;
    background: var(--bg-card);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 1rem;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    box-shadow: var(--shadow-sm);
}

.menu-item:hover {
    background: var(--color-primary);
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.menu-item.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-color: var(--color-primary-light);
    box-shadow: 0 0 30px rgba(124, 58, 237, 0.4);
}

.menu-item .icon {
    font-size: 1.4rem;
    font-style: normal;
}

.menu-item .title {
    font-weight: 600;
}

.sort-panel {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color);
    margin-top: 1rem;
}

.sort-label {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

.sort-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--bg-card);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

.sort-item:hover {
    background: var(--color-secondary);
    color: white;
    transform: translateY(-2px);
}

.sort-item.active {
    background: var(--color-secondary);
    color: white;
    border-color: var(--color-secondary);
}

.sort-item .icon {
    font-style: normal;
}

.app-content {
    background: var(--bg-surface);
    border-radius: 1.5rem;
    padding: 2.5rem;
    min-height: 500px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.card {
    background: var(--bg-card);
    border-radius: 1.25rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 2px solid var(--border-color);
}

.avatar {
    font-size: 3.5rem;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    line-height: 1.3;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.field {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    padding: 0.5rem;
    background: var(--bg-surface);
    border-radius: 0.5rem;
}

.field .icon {
    font-size: 1.25rem;
    font-style: normal;
}

.note {
    margin-top: 0.75rem;
    padding: 1rem;
    background: var(--bg-surface);
    border-radius: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    border-left: 3px solid var(--color-primary);
}

.empty-box {
    text-align: center;
    padding: 5rem 2rem;
}

.empty-icon {
    font-size: 6rem;
    margin-bottom: 1.5rem;
    opacity: 0.7;
}

.empty-box h2, .empty-box h3 {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.empty-box p {
    color: var(--text-secondary);
    font-size: 1.15rem;
}

.pagination-wrapper {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.page-btn {
    display: inline-block;
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 0.75rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

.page-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.page-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary-light);
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.3);
}

.form-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.page-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 1.25rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.field-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.req {
    color: var(--color-error);
    font-weight: 700;
    font-size: 1.2rem;
}

.field-group input,
.field-group select,
.field-group textarea {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-surface);
    color: var(--text-primary);
}

.field-group input:focus,
.field-group select:focus,
.field-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.2);
}

.field-group input:invalid:not(:focus):not(:placeholder-shown),
.field-group select:invalid:not(:focus),
.field-group textarea:invalid:not(:focus):not(:placeholder-shown) {
    border-color: var(--color-error);
}

.field-group input:valid:not(:focus):not(:placeholder-shown),
.field-group select:valid:not(:focus):not([value=""]),
.field-group textarea:valid:not(:focus):not(:placeholder-shown) {
    border-color: var(--color-success);
}

.field-group input:user-invalid {
    border-color: var(--color-error);
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%23ef4444" viewBox="0 0 16 16"><path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14zm0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16z"/><path d="M7.002 11a1 1 0 1 1 2 0 1 1 0 0 1-2 0zM7.1 4.995a.905.905 0 1 1 1.8 0l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 4.995z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

.field-group textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

.action-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    padding-top: 1.5rem;
}

.btn {
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 0.75rem;
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-md), 0 0 30px rgba(124, 58, 237, 0.4);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

.notification {
    padding: 1.25rem 1.75rem;
    border-radius: 0.75rem;
    margin-bottom: 2rem;
    font-weight: 500;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    border: 2px solid;
    box-shadow: var(--shadow-sm);
    line-height: 1.6;
}

.notification-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--color-success);
    border-color: var(--color-success);
}

.notification-error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-error);
    border-color: var(--color-error);
}

.selector-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: 1.25rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.selector-item {
    padding: 0.75rem 1.5rem;
    background: var(--bg-surface);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 0.75rem;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    border: 2px solid var(--border-color);
}

.selector-item:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.selector-item.active {
    background: var(--color-primary);
    border-color: var(--color-primary-light);
    font-weight: 600;
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.3);
}

.removal-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 700px;
    margin: 0 auto;
}

.warning-msg {
    padding: 1.25rem;
    background: rgba(245, 158, 11, 0.15);
    border: 2px solid var(--color-warning);
    border-radius: 0.75rem;
    color: var(--color-warning);
    text-align: center;
    font-weight: 600;
}

.removal-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.removal-item:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--color-error);
    transform: translateX(8px);
}

.contact-icon {
    font-size: 2.5rem;
}

.contact-name {
    flex: 1;
    font-weight: 500;
    font-size: 1.1rem;
}

.remove-icon {
    font-size: 1.75rem;
    opacity: 0.5;
    transition: opacity 0.2s ease;
}

.removal-item:hover .remove-icon {
    opacity: 1;
}

.app-footer {
    text-align: center;
    padding: 2.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

@media (max-width: 768px) {
    .app-wrapper {
        padding: 1rem;
    }
    
    .app-header {
        padding: 1.5rem;
    }
    
    .brand {
        font-size: 2rem;
    }
    
    .app-content {
        padding: 1.5rem;
    }
    
    .row {
        grid-template-columns: 1fr;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .main-navigation {
        flex-direction: column;
    }
    
    .menu-item {
        justify-content: center;
    }
}