:root {
    /* Modern Professional Palette - Light */
    --bg-color: #fcfcfd;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --text-primary: #101828;
    --text-secondary: #475467;
    --text-muted: #667085;
    --border-color: #eaecf0;
    --primary-color: #2e90fa;
    --primary-hover: #1570ef;
    --secondary-color: #ffffff;
    --success-color: #12b76a;
    --danger-color: #f04438;
    --warning-color: #fdb022;
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(16, 24, 40, 0.1), 0 2px 4px -2px rgba(16, 24, 40, 0.06);
    --sidebar-width: 260px;
    --border-radius: 8px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body.dark-theme {
    /* Modern Professional Palette - Dark */
    --bg-color: #0c111d;
    --sidebar-bg: #101828;
    --card-bg: #101828;
    --text-primary: #f9fafb;
    --text-secondary: #d0d5dd;
    --text-muted: #98a2b3;
    --border-color: #1f242f;
    --primary-color: #2e90fa;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styling - Slimmer & Modern */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: fixed;
    z-index: 1000;
}

.sidebar-header {
    margin-bottom: 32px;
    padding: 0 12px;
    height: 40px;
    display: flex;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.nav-links {
    list-style: none;
    flex-grow: 1;
}

.nav-section-title {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 24px 0 8px 12px !important;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--border-radius);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 2px;
}

.nav-links a .material-symbols-outlined {
    font-size: 20px;
}

.nav-links a:hover {
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.nav-links a.active {
    background-color: #eff8ff;
    color: var(--primary-color);
}

body.dark-theme .nav-links a.active {
    background-color: #175cd3;
    color: #ffffff;
}

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

/* Content Area */
.content {
    margin-left: var(--sidebar-width);
    flex-grow: 1;
    padding: 32px 48px;
    min-height: 100vh;
    max-width: 1400px;
}

/* Professional Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    gap: 8px;
}

.btn.primary {
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

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

.btn.secondary {
    background-color: var(--secondary-color);
    color: var(--text-secondary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

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

.btn.success {
    background-color: var(--success-color);
    color: #ffffff;
}

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

.btn-sm {
    padding: 6px 10px;
    font-size: 0.75rem;
}

/* Card Styling - Slimmer */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    transition: box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-footer {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    margin-bottom: -4px; /* Adjust for card's 20px padding to get consistent 16px spacing */
}

/* Typography Refinement */
h1 {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); font-size: 0.875rem; }

/* View Header */
.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    min-height: 48px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

/* Grid Layouts */
.menu-grid, .table-grid, .kds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* Table Card Refinement */
.table-card {
    text-align: left;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.table-card h4 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.table-card .status {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    width: fit-content;
}

.status-available { background-color: #ecfdf3; color: #027a48; border: 1px solid #abefc6; }
.status-occupied { background-color: #fef3f2; color: #b42318; border: 1px solid #fda29b; }
.status-reserved { background-color: #fffaeb; color: #b54708; border: 1px solid #fedf89; }

body.dark-theme .status-available { background-color: rgba(18, 183, 106, 0.1); color: #12b76a; }
body.dark-theme .status-occupied { background-color: rgba(240, 68, 56, 0.1); color: #f04438; }
body.dark-theme .status-reserved { background-color: rgba(253, 176, 34, 0.1); color: #fdb022; }

/* Menu Item Card Refinement */
.menu-item-card {
    padding: 20px;
}

.section-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--primary-color);
    background-color: #eff8ff;
    padding: 2px 8px;
    border-radius: 4px;
    margin: 4px 0 8px;
}

body.dark-theme .section-tag {
    background-color: rgba(46, 144, 250, 0.1);
}

.price {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Order Entry Refinement */
.order-system {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    align-items: start;
}

.order-summary-sidebar {
    padding: 24px;
    position: sticky;
    top: 32px;
}

.order-summary-list {
    margin: 24px 0;
}

.order-summary-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.item-qty {
    font-weight: 600;
    width: 32px;
    text-align: center;
}

/* KDS Refinement */
.kds-sections-tabs {
    background-color: var(--bg-color);
    padding: 4px;
    border-radius: 10px;
    display: inline-flex;
    gap: 4px;
    border: 1px solid var(--border-color);
}

.kds-sections-tabs .btn {
    border-radius: 6px;
    padding: 6px 12px;
}

.order-card {
    padding: 0;
    overflow: hidden;
    border-top: 4px solid var(--primary-color);
}

.order-card-inner {
    padding: 20px;
}

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

.order-item-kds {
    padding: 12px 0;
    border-bottom: 1px dotted var(--border-color);
}

/* Modal Refinement */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background-color: var(--sidebar-bg);
    border-radius: 12px;
    padding: 32px;
    width: 480px;
    max-width: 90%;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    position: relative;
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-body {
    padding: 8px 0;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

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

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input, .form-group select {
    width: 100%;
    display: block;
    font-family: var(--font-main);
    font-size: 0.9375rem;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(46, 144, 250, 0.1);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.modal-footer .btn {
    min-width: 100px;
}

/* Utility Classes */
.hidden { display: none; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }
.mt-4 { margin-top: 24px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 24px; }
.pt-2 { padding-top: 8px; }
.pt-3 { padding-top: 16px; }
.pt-4 { padding-top: 24px; }
.pb-2 { padding-bottom: 8px; }
.pb-3 { padding-bottom: 16px; }
.pb-4 { padding-bottom: 24px; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.align-center { align-items: center; }
.gap-10 { gap: 10px; }
.flex-wrap { flex-wrap: wrap; }
.w-100 { width: 100%; }
.grid-full { grid-column: 1 / -1; }
.text-center { text-align: center; }