* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Arial, sans-serif;
}

:root {
    --bg-color: #f5f7fa;
    --text-color: #2c3e50;
    --card-bg: white;
    --border-color: #eee;
    --hover-bg: #f8f9fa;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --search-bg: white;
    --search-border: #e0e0e0;
    --header-bg: #f8f9fa;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --card-bg: #2d2d2d;
    --border-color: #404040;
    --hover-bg: #363636;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --search-bg: #363636;
    --search-border: #404040;
    --header-bg: #2d2d2d;
}

body {
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--card-bg) 100%);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    transition: all 0.3s ease;
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

header {
    margin-bottom: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--hover-bg);
}

h1 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 2.2rem;
    font-weight: 600;
    text-shadow: 1px 1px 2px var(--shadow-color);
}

.search-box {
    position: relative;
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #95a5a6;
}

#searchInput {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--search-border);
    border-radius: 50px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--search-bg);
    color: var(--text-color);
}

#searchInput:focus {
    outline: none;
    border-color: #25D366;
    box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.1);
}

.table-container {
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 4px 6px var(--shadow-color);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

th, td {
    padding: 1.2rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--header-bg);
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

tr:hover {
    background: var(--hover-bg);
}

.sortable {
    cursor: pointer;
    user-select: none;
    position: relative;
    padding-right: 2rem !important;
}

.sortable:hover {
    background: var(--hover-bg);
}

.sortable i {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #95a5a6;
    transition: all 0.3s ease;
}

.sortable.asc i {
    color: #25D366;
    transform: translateY(-50%) rotate(180deg);
}

.sortable.desc i {
    color: #25D366;
}

.whatsapp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: #25D366;
    color: white;
    text-decoration: none;
    border-radius: 50%;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.whatsapp-btn:hover {
    background: #128C7E;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(37, 211, 102, 0.2);
}

.phone-number {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.phone-number:hover {
    color: #25D366;
}

.category-badge {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
}

.category-keluarga {
    background: #e3f2fd;
    color: #1976d2;
}

.category-kantor {
    background: #f3e5f5;
    color: #7b1fa2;
}

.category-teman {
    background: #e8f5e9;
    color: #388e3c;
}

@media (max-width: 768px) {
    .container {
        margin: 1rem auto;
        padding: 0 1rem;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    th, td {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
    
    .category-column,
    .action-column {
        display: none;
    }
    
    .whatsapp-btn {
        display: none;
    }
    
    .phone-number {
        color: #25D366;
        text-decoration: underline;
    }
    
    .category-badge {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }


    .sortable {
        padding-right: 1rem !important;
    }

    table {
        min-width: 80%;
        max-width: 100%;
    }
}