:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --secondary: #475569;
    --success: #16a34a;
    --danger: #dc2626;
    --danger-light: #fef2f2;
    --warning: #d97706;
    --warning-light: #fffbeb;
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #0f172a;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', '맑은 고딕', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    font-size: 14px;
    line-height: 1.5;
}

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background-color: var(--bg-sidebar);
    color: #f8fafc;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-brand {
    padding: 20px 24px;
    font-size: 18px;
    font-weight: 700;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    text-decoration: none;
}

.sidebar-brand span.badge-env {
    font-size: 11px;
    background: var(--primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.sidebar-nav {
    list-style: none;
    padding: 16px 12px;
    flex: 1;
}

.sidebar-nav li {
    margin-bottom: 4px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 14px;
    color: #cbd5e1;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: all 0.15s ease;
}

.sidebar-nav a:hover {
    background-color: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.sidebar-nav a.active {
    background-color: var(--primary);
    color: #fff;
    font-weight: 600;
}

.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    height: 60px;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
}

.topbar-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-main);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 13px;
}

.topbar-user .user-badge {
    background-color: var(--primary-light);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 999px;
    font-weight: 600;
}

.content-area {
    padding: 24px 28px;
    flex: 1;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Search Bar */
.search-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

/* Forms & Inputs */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 14px;
}

.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
}

.form-label .req {
    color: var(--danger);
    margin-left: 2px;
}

.form-control {
    height: 36px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    color: var(--text-main);
    background-color: #fff;
    transition: border-color 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.form-control[readonly], .form-control:disabled {
    background-color: #f1f5f9;
    color: var(--text-muted);
}

textarea.form-control {
    height: auto;
    padding: 8px 12px;
    resize: vertical;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 36px;
    padding: 0 14px;
    font-size: 13.5px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-sm {
    height: 30px;
    padding: 0 10px;
    font-size: 12.5px;
}

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

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

.btn-secondary {
    background-color: #fff;
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: #f8fafc;
    border-color: #cbd5e1;
}

.btn-danger {
    background-color: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background-color: #b91c1c;
}

.btn-outline-danger {
    background-color: #fff;
    border-color: #fca5a5;
    color: var(--danger);
}

.btn-outline-danger:hover {
    background-color: var(--danger-light);
}

/* Tables */
.table-container {
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 13.5px;
}

table.data-table th {
    background-color: #f8fafc;
    color: var(--secondary);
    font-weight: 600;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

table.data-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

table.data-table tbody tr {
    transition: background-color 0.1s ease;
}

table.data-table tbody tr:hover {
    background-color: #f1f5f9;
}

table.data-table tbody tr.selected {
    background-color: var(--primary-light);
}

table.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 999px;
}

.badge-y {
    background-color: #dcfce7;
    color: #15803d;
}

.badge-n {
    background-color: #fee2e2;
    color: #b91c1c;
}

.badge-info {
    background-color: #dbeafe;
    color: #1d4ed8;
}

/* Toast Alert */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    min-width: 280px;
    max-width: 420px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background: #1e293b;
    color: #fff;
    box-shadow: var(--shadow-md);
    font-size: 13.5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    animation: fadeIn 0.2s ease;
}

.toast.toast-error {
    background: var(--danger);
}

.toast.toast-success {
    background: var(--success);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}