:root {
    --admin-bg: #f8fafc;
    --admin-sidebar: #ffffff;
    --admin-card: #ffffff;
    --admin-text: #1e293b;
    --admin-text-muted: #64748b;
    --admin-primary: #0ea5e9;
    --admin-primary-hover: #0284c7;
    --admin-border: #e2e8f0;
    --admin-danger: #ef4444;
}

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

body, input, select, textarea, button {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: var(--admin-bg);
    color: var(--admin-text);
    font-size: 14px;
    height: 100vh;
    display: flex;
}

a {
    text-decoration: none;
    color: var(--admin-primary);
}

button {
    cursor: pointer;
}

/* Login Page specific */
.login-page {
    justify-content: center;
    align-items: center;
}

.login-card {
    background: var(--admin-card);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--admin-border);
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.login-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--admin-text-muted);
}

.form-control {
    width: 100%;
    padding: 12px;
    background: #f1f5f9;
    border: 1px solid var(--admin-border);
    border-radius: 6px;
    color: var(--admin-text);
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--admin-primary);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--admin-primary);
    color: #ffffff;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    transition: background 0.2s;
}

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

.btn-block {
    width: 100%;
    display: block;
    text-align: center;
}

/* Layout */
.sidebar {
    width: 250px;
    background: var(--admin-sidebar);
    border-right: 1px solid var(--admin-border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    font-size: 1.2rem;
    font-weight: 700;
    border-bottom: 1px solid var(--admin-border);
    text-align: center;
}

.nav-menu {
    list-style: none;
    padding: 10px 0;
    flex: 1;
}

.nav-menu li a {
    display: block;
    padding: 12px 20px;
    color: var(--admin-text-muted);
    transition: all 0.2s;
}

.nav-menu li a:hover, .nav-menu li a.active {
    background: rgba(56, 189, 248, 0.1);
    color: var(--admin-primary);
    border-left: 3px solid var(--admin-primary);
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

/* Tables */
.table-wrapper {
    background: var(--admin-card);
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    overflow: hidden;
}

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

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--admin-border);
}

th {
    background: #f1f5f9;
    color: var(--admin-text-muted);
    font-weight: 600;
}

.action-btn {
    background: none;
    border: none;
    color: var(--admin-primary);
    margin-right: 10px;
}
.action-btn.danger {
    color: var(--admin-danger);
}