/* DESIGN SYSTEM & CONSTANTS - MINIMALIST LIGHT BLUE & WHITE THEME */
:root {
    --bg-primary: #f8fafc;       /* Slate 50 (Very light gray-blue background) */
    --bg-secondary: #ffffff;     /* Pure White (Cards background) */
    --bg-tertiary: #f1f5f9;      /* Slate 100 (Subtle backgrounds and separators) */
    --accent-color: #002060;     /* Navy Blue #002060 (Brand main color) */
    --accent-hover: #001848;     /* Darker Navy Blue */
    --success-color: #059669;    /* Emerald 600 */
    --success-hover: #047857;    /* Emerald 700 */
    --danger-color: #dc2626;     /* Red 600 */
    --danger-hover: #b91c1c;     /* Red 700 */
    --warning-color: #d97706;    /* Amber 600 */
    --text-primary: #0f172a;     /* Slate 900 (Dark slate primary text) */
    --text-secondary: #475569;   /* Slate 600 (Medium slate secondary text) */
    --text-muted: #94a3b8;       /* Slate 400 (Muted text) */
    --border-color: #e2e8f0;     /* Slate 200 (Clean light borders) */
    --card-shadow: 0 4px 6px -1px rgba(0, 32, 96, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
    --card-shadow-lg: 0 10px 15px -3px rgba(0, 32, 96, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
    --border-radius-sm: 6px;
    --border-radius: 10px;
    --border-radius-lg: 14px;
    --transition-speed: 0.2s;
    --font-sans: 'Outfit', 'Noto Sans Thai', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    overflow-x: hidden;
    padding: 24px;
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* HEADER STYLE */
.app-header {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent-color);
    background: rgba(0, 32, 96, 0.05);
    padding: 12px;
    border-radius: var(--border-radius);
    border: 1px solid rgba(0, 32, 96, 0.1);
}

.logo-area h1 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--accent-color);
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.system-actions {
    display: flex;
    gap: 12px;
}

/* NAVIGATION TABS */
.app-nav {
    display: flex;
    gap: 6px;
    background-color: var(--bg-secondary);
    padding: 6px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.nav-tab {
    flex: 1;
    background: none;
    border: none;
    padding: 12px 16px;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--transition-speed) ease;
}

.nav-tab i {
    font-size: 1.1rem;
}

.nav-tab:hover {
    color: var(--accent-color);
    background-color: var(--bg-tertiary);
}

.nav-tab.active {
    color: #ffffff;
    background-color: var(--accent-color);
    box-shadow: 0 4px 10px rgba(0, 32, 96, 0.2);
}

.nav-tab .badge {
    background-color: var(--danger-color);
    color: #ffffff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
    min-width: 20px;
    text-align: center;
}

/* MAIN CONTENT */
.app-content {
    min-height: 500px;
}

.tab-pane {
    display: none;
    animation: fadeIn var(--transition-speed) ease;
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* CARDS STYLING */
.card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-header.justify-between {
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

/* TABLES STYLING */
.table-wrapper {
    overflow-x: auto;
    width: 100%;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.data-table th {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    padding: 12px 20px;
    border-bottom: 2px solid var(--border-color);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background-color 0.15s ease;
}

.data-table tbody tr:hover {
    background-color: rgba(0, 32, 96, 0.015);
}

.data-table .text-center {
    text-align: center;
}

.data-table .text-right {
    text-align: right;
}

/* BUTTONS STYLING */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 4px 10px rgba(0, 32, 96, 0.15);
}

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

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

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

.btn-success:hover:not(:disabled) {
    background-color: var(--success-hover);
    box-shadow: 0 4px 10px rgba(5, 150, 105, 0.2);
}

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

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

.btn-icon-only {
    padding: 8px;
    border-radius: 6px;
    font-size: 0.95rem;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 6px 12px;
}

.btn-text:hover {
    color: var(--danger-color);
    background-color: rgba(220, 38, 38, 0.05);
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* SEARCH & INPUTS */
.search-box {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.search-box input {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 9px 12px 9px 34px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    width: 240px;
    transition: all 0.15s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 32, 96, 0.1);
}

/* FORM ELEMENTS */
.form-group {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group label .required {
    color: var(--danger-color);
}

.form-group input, 
.form-group select, 
.form-group textarea, 
.form-control {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 9px 12px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    transition: all 0.15s ease;
}

.form-group input:focus, 
.form-group select:focus, 
.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 32, 96, 0.1);
}

.filter-group {
    display: flex;
    gap: 8px;
}

/* BORROW TAB GRID LAYOUT */
.borrow-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 20px;
    align-items: start;
}

@media (max-width: 992px) {
    .borrow-grid {
        grid-template-columns: 1fr;
    }
}

.catalog-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    min-height: 500px;
}

.cart-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 20px;
}

/* CART ITEMS LIST */
.cart-items-wrapper {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    max-height: 280px;
    overflow-y: auto;
    background-color: #ffffff;
}

.cart-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cart-item {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    animation: slideIn 0.2s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(8px); }
    to { opacity: 1; transform: translateX(0); }
}

.cart-item-info {
    flex: 1;
}

.cart-item-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.cart-item-meta {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.cart-qty-ctrl {
    display: flex;
    align-items: center;
    gap: 6px;
}

.cart-qty-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 26px;
    height: 26px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    transition: background-color 0.15s;
}

.cart-qty-btn:hover {
    background-color: var(--bg-tertiary);
}

.cart-qty-val {
    font-size: 0.88rem;
    font-weight: 700;
    width: 20px;
    text-align: center;
}

.cart-empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 2.2rem;
    margin-bottom: 8px;
    opacity: 0.3;
}

.borrow-form {
    padding: 20px;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

/* RETURN ACTION BAR & SELECTIONS */
.return-action-bar {
    background-color: var(--bg-tertiary);
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.selected-count-label {
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--text-secondary);
}

.selected-count-label span {
    color: var(--accent-color);
}

/* BADGES & STATS */
.badge-status {
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    display: inline-block;
}

.badge-borrow {
    background-color: rgba(0, 32, 96, 0.05);
    color: var(--accent-color);
    border: 1px solid rgba(0, 32, 96, 0.12);
}

.badge-return {
    background-color: rgba(5, 150, 105, 0.05);
    color: var(--success-color);
    border: 1px solid rgba(5, 150, 105, 0.12);
}

.qty-pill {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    display: inline-block;
}

.qty-out {
    color: var(--danger-color);
    background-color: rgba(220, 38, 38, 0.05);
    border-color: rgba(220, 38, 38, 0.12);
}

.qty-normal {
    color: var(--text-primary);
}

/* MODALS */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
}

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

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--card-shadow-lg);
    animation: modalSlideUp var(--transition-speed) cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
    from { transform: translateY(15px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-color);
}

.close-modal-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.4rem;
    cursor: pointer;
    transition: color 0.15s;
}

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

#product-form {
    padding: 20px 24px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 20px;
}

/* TOAST NOTIFICATIONS */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background-color: var(--bg-secondary);
    border-left: 4px solid var(--accent-color);
    color: var(--text-primary);
    padding: 12px 18px;
    border-radius: 6px;
    box-shadow: var(--card-shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 300px;
    max-width: 450px;
    animation: toastSlideIn 0.25s cubic-bezier(0.16, 1, 0.3, 1), fadeOut 0.25s ease 4.7s forwards;
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.88rem;
    font-weight: 500;
}

.toast-success {
    border-left-color: var(--success-color);
}

.toast-danger {
    border-left-color: var(--danger-color);
}

.toast-warning {
    border-left-color: var(--warning-color);
}

@keyframes toastSlideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    to { opacity: 0; transform: translateY(8px); }
}

/* UTILITIES */
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.text-xs { font-size: 0.75rem; }
.bold { font-weight: 600; }
.no-wrap { white-space: nowrap; }

/* Custom Checkbox Styling */
input[type="checkbox"] {
    appearance: none;
    background-color: #ffffff;
    margin: 0;
    font: inherit;
    color: var(--accent-color);
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    display: inline-grid;
    place-content: center;
    cursor: pointer;
    transition: all 0.15s ease;
}

input[type="checkbox"]::before {
    content: "";
    width: 9px;
    height: 9px;
    transform: scale(0);
    transition: 100ms transform ease-in-out;
    box-shadow: inset 1em 1em #ffffff;
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

input[type="checkbox"]:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

input[type="checkbox"]:checked::before {
    transform: scale(1);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* SET COMPONENTS UI STYLING */
.set-component-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.set-component-row input {
    background-color: #ffffff !important;
    border: 1px solid var(--border-color) !important;
    padding: 6px 10px !important;
    font-size: 0.85rem !important;
}

.sub-items-list {
    background-color: var(--bg-tertiary);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 10px 14px;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: none;
    animation: fadeIn 0.15s ease;
}

.sub-items-list.show {
    display: block;
}

.sub-items-list ul {
    list-style: none;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.sub-items-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    padding-bottom: 4px;
}

.sub-items-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.toggle-sub-link {
    color: var(--accent-color);
    font-size: 0.8rem;
    cursor: pointer;
    background: none;
    border: none;
    text-decoration: underline;
    font-family: var(--font-sans);
    padding: 2px 6px;
    font-weight: 500;
}

.toggle-sub-link:hover {
    color: var(--text-primary);
}

/* LOG ACCORDION STYLING */
.accordion-header {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px 20px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.15s;
}

.accordion-header:hover {
    background-color: var(--bg-tertiary);
}

.accordion-header h3 {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.accordion-header .chevron-icon {
    transition: transform 0.2s ease;
    color: var(--text-secondary);
}

.accordion-header.active .chevron-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s cubic-bezier(0, 1, 0, 1);
    margin-bottom: 8px;
    border: 1px solid transparent;
    border-top: none;
    border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
}

.accordion-content.show {
    max-height: 2000px;
    transition: max-height 0.25s ease-in-out;
    border-color: var(--border-color);
    background-color: #ffffff;
}