:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #F3F4F6;
    --text-main: #111827;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --bg-main: #F9FAFB;
    --bg-surface: #FFFFFF;
    --danger: #EF4444;
    --danger-hover: #DC2626;
    --success: #10B981;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-header i {
    font-size: 28px;
    color: var(--primary);
}

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.sidebar-section {
    flex: 1;
    overflow-y: auto;
    padding: 24px 16px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding: 0 8px;
}

.section-header h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.05em;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background-color: var(--secondary);
    color: var(--text-main);
}

.room-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.room-item {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
}

.room-item i {
    font-size: 18px;
}

.room-item:hover {
    background-color: var(--secondary);
    color: var(--text-main);
}

.room-item.active {
    background-color: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-main);
    overflow: hidden;
}

.top-nav {
    height: 72px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}

.top-nav h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 12px;
}

.content-body {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    color: var(--border);
}

.empty-state p {
    font-size: 1.125rem;
    font-weight: 500;
}

/* Buttons */
.primary-btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.danger-btn {
    background-color: white;
    color: var(--danger);
    border: 1px solid var(--border);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.danger-btn:hover {
    background-color: #FEF2F2;
    border-color: #FECACA;
}

.full-width {
    width: 100%;
}

/* Table Wrapper */
.equipment-container {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    overflow: hidden;
}

.table-wrapper {
    width: 100%;
    overflow-x: auto;
}

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

th, td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

th {
    background-color: #F9FAFB;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    font-size: 0.95rem;
    vertical-align: middle;
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background-color: #F9FAFB;
}

tfoot td {
    background-color: #F9FAFB;
    font-size: 1.125rem;
    color: var(--text-main);
    border-top: 2px solid var(--border);
}

.delete-item-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.delete-item-btn:hover {
    color: var(--danger);
    background-color: #FEF2F2;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(17, 24, 39, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    backdrop-filter: blur(4px);
}

.modal.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: var(--bg-surface);
    width: 100%;
    max-width: 440px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 20px;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--text-main);
}

.modal-body {
    padding: 24px;
}

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

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background-color: #F9FAFB;
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

.cancel-btn {
    background: white;
    border: 1px solid var(--border);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.cancel-btn:hover {
    background-color: var(--bg-main);
}

.hidden {
    display: none !important;
}

/* Tooltip */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--text-main);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
    margin-bottom: 8px;
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}