:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg: #f9fafb;
    --surface: #ffffff;
    --text: #1f2937;
    --border: #e5e7eb;
    --success: #10b981;
    --success-hover: #059669;
    --danger: #ef4444;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text);
}

.btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn.success {
    background-color: var(--success);
    color: white;
    width: 100%;
}

.btn.success:hover {
    background-color: var(--success-hover);
    transform: scale(1.02);
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    text-align: left;
}

th, td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

th {
    background-color: #f3f4f6;
    font-weight: 600;
    color: #374151;
    position: sticky;
    top: 0;
}

th:first-child { border-top-left-radius: 8px; }
th:last-child { border-top-right-radius: 8px; }

tbody tr {
    transition: all 0.3s ease;
}

tbody tr:hover {
    background-color: #f8fafc;
}

tbody tr.removing {
    opacity: 0;
    transform: scale(0.95);
    background-color: #d1fae5;
}

input[type="text"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    box-sizing: border-box;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.1);
}

.hidden {
    display: none;
}

.error-msg {
    margin-top: 1rem;
    color: var(--danger);
    padding: 1rem;
    background-color: #fef2f2;
    border-radius: 6px;
    border: 1px solid #fecaca;
}