:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg: #F9FAFB;
    --surface: #FFFFFF;
    --text-main: #111827;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --danger: #EF4444;
    --danger-hover: #DC2626;
    --success: #10B981;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.5;
}

.admin-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-btn {
    text-decoration: none;
    color: var(--primary);
    font-weight: 500;
    border: 1px solid var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
}

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

section {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.input-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
}

input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn-primary {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

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

.message {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    text-align: center;
}

.message.hidden {
    display: none;
}

.message.success {
    background: #D1FAE5;
    color: #065F46;
}

.message.error {
    background: #FEE2E2;
    color: #991B1B;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

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

th {
    font-weight: 600;
    color: var(--text-muted);
    background: #F9FAFB;
}

.btn-delete {
    background: none;
    border: none;
    color: var(--danger);
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-delete:hover {
    background: #FEE2E2;
}

@media (max-width: 600px) {
    header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}