/**
 * Flat Design Corporativo Design System
 * Strictly based on Design.md
 * Colors: Primary #007BFF, Secondary #343A40, Surface #FFFFFF, Neutral #F8F9FA
 * Success #28A745, Warning #FFC107, Danger #DC3545, Info #17A2B8
 * Base Radius: 4px | Typography: Lato & JetBrains Mono | No gradients | Flat solid colors
 */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Lato:wght@300;400;500;600;700&display=swap');

:root {
    /* Color Palette */
    --corporate-blue: #007BFF;
    --corporate-blue-dark: #0062cc;
    --dark-grey-flat: #343A40;
    --dark-grey-hover: #23272b;
    --white-flat: #FFFFFF;
    --light-grey-flat: #F8F9FA;
    --border-flat: #DEE2E6;
    --border-dark: #ced4da;
    
    /* Semantic Colors */
    --success-green: #28A745;
    --success-dark: #1e7e34;
    --warning-orange: #FFC107;
    --warning-dark: #d39e00;
    --danger-red: #DC3545;
    --danger-dark: #bd2130;
    --info-cyan: #17A2B8;
    --info-dark: #117a8b;

    /* Typography */
    --font-flat: 'Lato', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', Menlo, Consolas, Monaco, monospace;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Elevation / Shadows (Strictly subtle, max 0 2px 8px rgba(0,0,0,0.08)) */
    --shadow-subtle: 0 2px 6px rgba(0, 0, 0, 0.05);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.07);
    --shadow-hover: 0 4px 10px rgba(0, 0, 0, 0.09);

    /* Layout Spacing */
    --sidebar-width: 260px;
    --navbar-height: 60px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-flat);
    font-size: 15px;
    line-height: 1.6;
    color: var(--dark-grey-flat);
    background-color: var(--light-grey-flat);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--dark-grey-flat);
    line-height: 1.3;
}

h1 { font-size: 1.85rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 0.95rem; }

a {
    color: var(--corporate-blue);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: var(--corporate-blue-dark);
}

/* Layout Architecture */
.app-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
    position: relative;
}

/* Sidebar Drawer Backdrop Overlay (Mobile & Tablet) */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.55);
    z-index: 1040;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

/* Sidebar */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--dark-grey-flat);
    color: #FFFFFF;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-header {
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    background-color: #2b3035;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-close-btn {
    display: none;
    background: transparent;
    border: none;
    color: #cbd5e1;
    font-size: 1.6rem;
    line-height: 1;
    cursor: pointer;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    transition: background 0.15s ease, color 0.15s ease;
}
.sidebar-close-btn:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: #FFFFFF;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #FFFFFF;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.2px;
}

.brand-icon {
    width: 30px;
    height: 30px;
    background-color: var(--corporate-blue);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
}

.sidebar-menu {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.menu-group-label {
    font-size: 0.725rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #9aa0a6;
    padding: 0.75rem 1.25rem 0.25rem;
    font-weight: 600;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0.65rem 1.25rem;
    color: #d1d5db;
    font-size: 0.925rem;
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid transparent;
}

.menu-item:hover {
    background-color: rgba(255, 255, 255, 0.06);
    color: #FFFFFF;
}

.menu-item.active {
    background-color: rgba(0, 123, 255, 0.15);
    color: #FFFFFF;
    border-left-color: var(--corporate-blue);
    font-weight: 600;
}

.menu-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.sidebar-footer {
    padding: 0.85rem 1.25rem;
    background-color: #2b3035;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.8rem;
    color: #9aa0a6;
}

/* Main Content Area */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-width: 100%;
    width: calc(100% - var(--sidebar-width));
    overflow-x: hidden;
}

/* Mobile Hamburger Button */
.mobile-menu-toggle-btn {
    display: none;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-flat);
    border-radius: var(--radius-sm);
    color: var(--dark-grey-flat);
    padding: 6px;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
    min-width: 38px;
    min-height: 38px;
}
.mobile-menu-toggle-btn:hover {
    background: var(--light-grey-flat);
}

/* Navbar */
.app-navbar {
    height: var(--navbar-height);
    background-color: var(--white-flat);
    border-bottom: 1px solid var(--border-flat);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 90;
    box-shadow: var(--shadow-subtle);
    max-width: 100%;
    overflow-x: clip;
}

.navbar-left, .navbar-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.branch-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background-color: #e8f4fd;
    color: var(--corporate-blue);
    border: 1px solid #c8e2fb;
    border-radius: var(--radius-sm);
    font-size: 0.825rem;
    font-weight: 600;
}

.branch-select-form select {
    padding: 5px 10px;
    font-size: 0.85rem;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    background-color: var(--white-flat);
    color: var(--dark-grey-flat);
    font-family: var(--font-flat);
}

.user-profile-badge {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 32px;
    height: 32px;
    background-color: var(--dark-grey-flat);
    color: #FFFFFF;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
}

/* Content Body */
.app-content {
    flex: 1;
    padding: 1.5rem;
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
}

/* Cards (Strict Design.md Specs: 4px radius, 1px border stroke, subtle shadow) */
.flat-card {
    background-color: var(--white-flat);
    border: 1px solid var(--border-flat);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-card);
    margin-bottom: 1.5rem;
}

.flat-card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-flat);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--white-flat);
}

.flat-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark-grey-flat);
    display: flex;
    align-items: center;
    gap: 8px;
}

.flat-card-body {
    padding: 1.25rem;
}

.flat-card-footer {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--border-flat);
    background-color: #fafbfc;
}

/* KPI Cards Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.kpi-card {
    background-color: var(--white-flat);
    border: 1px solid var(--border-flat);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    box-shadow: var(--shadow-card);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-left: 4px solid var(--corporate-blue);
    transition: transform 0.2s ease-out;
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.kpi-card.kpi-success { border-left-color: var(--success-green); }
.kpi-card.kpi-warning { border-left-color: var(--warning-orange); }
.kpi-card.kpi-danger  { border-left-color: var(--danger-red); }
.kpi-card.kpi-info    { border-left-color: var(--info-cyan); }
.kpi-card.kpi-dark    { border-left-color: var(--dark-grey-flat); }

.kpi-label {
    font-size: 0.85rem;
    color: #6c757d;
    font-weight: 600;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi-value {
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--dark-grey-flat);
    font-family: var(--font-flat);
}

.kpi-icon-wrap {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background-color: #f1f3f5;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-grey-flat);
}

/* Buttons (Strict Design.md specs: 4px radius, weight 600, no glow, -1px active press) */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-flat);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s, border-color 0.15s, transform 0.1s;
    user-select: none;
    line-height: 1.5;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background-color: var(--corporate-blue);
    color: #FFFFFF;
    border-color: var(--corporate-blue);
}
.btn-primary:hover {
    background-color: var(--corporate-blue-dark);
    border-color: var(--corporate-blue-dark);
    color: #FFFFFF;
}

.btn-secondary {
    background-color: var(--dark-grey-flat);
    color: #FFFFFF;
    border-color: var(--dark-grey-flat);
}
.btn-secondary:hover {
    background-color: var(--dark-grey-hover);
    border-color: var(--dark-grey-hover);
    color: #FFFFFF;
}

.btn-success {
    background-color: var(--success-green);
    color: #FFFFFF;
    border-color: var(--success-green);
}
.btn-success:hover {
    background-color: var(--success-dark);
    border-color: var(--success-dark);
    color: #FFFFFF;
}

.btn-warning {
    background-color: var(--warning-orange);
    color: #212529;
    border-color: var(--warning-orange);
}
.btn-warning:hover {
    background-color: var(--warning-dark);
    border-color: var(--warning-dark);
}

.btn-danger {
    background-color: var(--danger-red);
    color: #FFFFFF;
    border-color: var(--danger-red);
}
.btn-danger:hover {
    background-color: var(--danger-dark);
    border-color: var(--danger-dark);
    color: #FFFFFF;
}

.btn-outline-primary {
    background-color: transparent;
    color: var(--corporate-blue);
    border: 1.5px solid var(--corporate-blue);
}
.btn-outline-primary:hover {
    background-color: rgba(0, 123, 255, 0.08);
    color: var(--corporate-blue-dark);
}

.btn-outline-secondary {
    background-color: transparent;
    color: var(--dark-grey-flat);
    border: 1.5px solid var(--border-dark);
}
.btn-outline-secondary:hover {
    background-color: #e9ecef;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.825rem;
}

.btn-lg {
    padding: 12px 22px;
    font-size: 1.05rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Forms (Strict Design.md specs: Label above, 1px border stroke, focus ring 2px offset 2px) */
.form-group {
    margin-bottom: 1.15rem;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark-grey-flat);
}

.form-control {
    display: block;
    width: 100%;
    padding: 8px 12px;
    font-family: var(--font-flat);
    font-size: 0.925rem;
    color: var(--dark-grey-flat);
    background-color: var(--white-flat);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    border-color: var(--corporate-blue);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.form-control[readonly], .form-control:disabled {
    background-color: #e9ecef;
    opacity: 1;
}

textarea.form-control {
    min-height: 80px;
    resize: vertical;
}

.form-text-danger {
    font-size: 0.8rem;
    color: var(--danger-red);
    margin-top: 4px;
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -8px;
    margin-left: -8px;
}

.col, .col-12, .col-6, .col-4, .col-3, .col-8, .col-9 {
    padding-right: 8px;
    padding-left: 8px;
}

.col-12 { flex: 0 0 100%; max-width: 100%; }
.col-9  { flex: 0 0 75%;  max-width: 75%; }
.col-8  { flex: 0 0 66.666%; max-width: 66.666%; }
.col-6  { flex: 0 0 50%;  max-width: 50%; }
.col-4  { flex: 0 0 33.333%; max-width: 33.333%; }
.col-3  { flex: 0 0 25%;  max-width: 25%; }

/* Tables */
.table-responsive {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    display: block;
    position: relative;
}

.table-responsive > .flat-table {
    min-width: 580px;
    width: 100%;
}

.flat-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    color: var(--dark-grey-flat);
}

.flat-table th {
    background-color: #f1f3f5;
    color: var(--dark-grey-flat);
    font-weight: 700;
    text-align: left;
    padding: 10px 14px;
    border-bottom: 2px solid var(--border-flat);
    white-space: nowrap;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

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

.flat-table tr:hover {
    background-color: #f8f9fa;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 3px 8px;
    font-size: 0.775rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-align: center;
    white-space: nowrap;
}

.badge-primary { background-color: #e7f1ff; color: var(--corporate-blue); border: 1px solid #b8daff; }
.badge-success { background-color: #e2f0d9; color: var(--success-dark); border: 1px solid #c3e6cb; }
.badge-warning { background-color: #fff3cd; color: #856404; border: 1px solid #ffeeba; }
.badge-danger  { background-color: #f8d7da; color: var(--danger-dark); border: 1px solid #f5c6cb; }
.badge-secondary{ background-color: #e2e3e5; color: #383d41; border: 1px solid #d6d8db; }
.badge-info    { background-color: #d1ecf1; color: var(--info-dark); border: 1px solid #bee5eb; }

/* Alerts */
.flat-alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.925rem;
    border: 1px solid transparent;
}

.flat-alert-success { background-color: #d4edda; color: #155724; border-color: #c3e6cb; }
.flat-alert-danger  { background-color: #f8d7da; color: #721c24; border-color: #f5c6cb; }
.flat-alert-warning { background-color: #fff3cd; color: #856404; border-color: #ffeeba; }
.flat-alert-info    { background-color: #d1ecf1; color: #0c5460; border-color: #bee5eb; }

/* Modals */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(30, 41, 59, 0.65);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1100;
    padding: clamp(8px, 2vw, 16px);
    box-sizing: border-box;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.modal-backdrop.show {
    display: flex;
}

.modal-box, .modal-dialog {
    background-color: var(--white-flat);
    border-radius: var(--radius-sm);
    width: 100%;
    max-width: min(580px, calc(100vw - 20px));
    max-height: calc(100vh - 24px);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.22);
    border: 1px solid var(--border-flat);
    animation: modalFadeIn 0.2s ease-out;
    display: flex;
    flex-direction: column;
    margin: auto;
    overflow: hidden;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(-12px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-header {
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border-flat);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.modal-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    color: #6c757d;
    padding: 2px 6px;
    border-radius: 4px;
}
.modal-close:hover {
    color: var(--danger-red);
    background-color: #fee2e2;
}

.modal-body {
    padding: 1.15rem 1.25rem;
    max-height: calc(85vh - 110px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.modal-footer {
    padding: 0.85rem 1.25rem;
    border-top: 1px solid var(--border-flat);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    background-color: #fafbfc;
    flex-shrink: 0;
    flex-wrap: wrap;
}

/* Monospace text */
.font-mono {
    font-family: var(--font-mono);
}

/* Utilities */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-success { color: var(--success-green); }
.text-danger { color: var(--danger-red); }
.text-warning { color: var(--warning-orange); }
.text-muted { color: #6c757d; }
.fw-bold { font-weight: 700; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-none { display: none !important; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* Responsive Display Utilities */
@media (max-width: 575.98px) {
    .d-sm-none { display: none !important; }
    .d-sm-block { display: block !important; }
    .d-sm-inline { display: inline !important; }
    .d-sm-flex { display: flex !important; }
    .d-sm-inline-flex { display: inline-flex !important; }
}

@media (min-width: 576px) {
    .d-none.d-sm-inline { display: inline !important; }
    .d-none.d-sm-block { display: block !important; }
    .d-none.d-sm-flex { display: flex !important; }
    .d-none.d-sm-inline-flex { display: inline-flex !important; }
}

@media (max-width: 991.98px) {
    .d-md-none { display: none !important; }
    .d-md-block { display: block !important; }
    .d-md-inline { display: inline !important; }
    .d-md-flex { display: flex !important; }
    .d-md-inline-flex { display: inline-flex !important; }
}

@media (min-width: 992px) {
    .d-none.d-md-inline { display: inline !important; }
    .d-none.d-md-block { display: block !important; }
    .d-none.d-md-flex { display: flex !important; }
    .d-none.d-md-inline-flex { display: inline-flex !important; }
    .d-lg-none { display: none !important; }
    .d-lg-block { display: block !important; }
    .d-lg-inline { display: inline !important; }
    .d-lg-flex { display: flex !important; }
    .d-lg-inline-flex { display: inline-flex !important; }
}

/* -----------------------------------------------------------------------------
 * RESPONSIVE BREAKPOINT RULES (Update_Feature.md Module 4 & Design.md)
 * -------------------------------------------------------------------------- */

/* 1. Mobile & Tablet Drawer System (<= 991.98px) */
@media (max-width: 991.98px) {
    .mobile-menu-toggle-btn {
        display: inline-flex !important;
    }
    .sidebar-close-btn {
        display: block !important;
    }
    .app-sidebar {
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        width: 280px;
        max-width: 85vw;
        z-index: 1050;
        transform: translateX(-100%);
        transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: none;
    }
    .app-sidebar.show {
        transform: translateX(0);
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.35);
    }
    .app-main {
        margin-left: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
    }
    .app-content {
        padding: clamp(0.75rem, 2.5vw, 1.25rem);
    }
    .app-navbar {
        padding: 0 clamp(0.65rem, 2vw, 1.25rem);
    }
    .notification-dropdown {
        width: min(320px, calc(100vw - 24px)) !important;
        right: -30px !important;
    }
}

/* 2. Tablet Specific Breakpoint (576px – 991.98px) */
@media (min-width: 576px) and (max-width: 991.98px) {
    .col-3, .col-4 {
        flex: 0 0 50%;
        max-width: 50%;
    }
    .col-8, .col-9 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .kpi-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }
}

/* 3. Mobile Phone Breakpoint (< 575.98px) */
@media (max-width: 575.98px) {
    .app-content {
        padding: 0.75rem;
    }
    .app-navbar {
        padding: 0 0.65rem;
        height: 56px;
    }
    .branch-select-form select {
        max-width: 125px;
        font-size: 0.775rem;
        padding: 4px 6px;
    }
    .navbar-right {
        gap: 5px;
    }
    .col, .col-12, .col-9, .col-8, .col-6, .col-4, .col-3 {
        flex: 0 0 100% !important;
        max-width: 100% !important;
    }
    .form-row {
        margin-left: 0;
        margin-right: 0;
    }
    .kpi-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    .btn {
        min-height: 44px;
        padding: 8px 12px;
    }
    .btn-sm {
        min-height: 36px;
        padding: 4px 8px;
    }
    .form-control, select.form-control {
        min-height: 44px;
        font-size: 16px; /* Prevents auto-zoom on iOS */
    }
    .flat-card {
        margin-bottom: 1rem;
    }
    .flat-card-header {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
        gap: 8px;
    }
    .flat-card-body {
        padding: 0.85rem;
    }
    
    /* Responsive Table-to-Card Transformation */
    .table-responsive-card thead {
        display: none !important;
    }
    .table-responsive-card tbody,
    .table-responsive-card tbody tr {
        display: block !important;
        width: 100% !important;
    }
    .table-responsive-card tbody tr {
        background: var(--white-flat);
        margin-bottom: 12px;
        border: 1px solid var(--border-flat);
        border-radius: var(--radius-sm);
        padding: 10px 12px;
        box-shadow: var(--shadow-subtle);
    }
    .table-responsive-card tbody td {
        display: flex !important;
        justify-content: space-between !important;
        align-items: center !important;
        padding: 7px 0 !important;
        border-bottom: 1px dashed var(--border-flat) !important;
        text-align: right !important;
        font-size: 0.85rem !important;
    }
    .table-responsive-card tbody td:last-child {
        border-bottom: none !important;
        padding-top: 8px !important;
        justify-content: flex-end !important;
    }
    .table-responsive-card tbody td::before {
        content: attr(data-label);
        font-weight: 600;
        color: #6c757d;
        text-align: left;
        padding-right: 12px;
        flex-shrink: 0;
    }
    .table-responsive-card > .flat-table {
        min-width: 0 !important;
    }
}

/* 4. Laptop Breakpoint (992px to 1199.98px) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    :root {
        --sidebar-width: 240px;
    }
    .app-main {
        margin-left: 240px;
        width: calc(100% - 240px);
    }
    .app-content {
        padding: 1.25rem;
        max-width: 100%;
    }
    .kpi-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 1rem;
    }
}

/* 5. Desktop Breakpoint (1200px and above) */
@media (min-width: 1200px) {
    .mobile-menu-toggle-btn {
        display: none !important;
    }
    .sidebar-overlay {
        display: none !important;
    }
    .sidebar-close-btn {
        display: none !important;
    }
    .app-sidebar {
        transform: none !important;
        position: fixed;
    }
    .app-main {
        margin-left: var(--sidebar-width) !important;
        width: calc(100% - var(--sidebar-width)) !important;
    }
}

/* -----------------------------------------------------------------------------
 * DARK MODE THEME RULES (Design.md & Update_Feature.md Module 5)
 * -------------------------------------------------------------------------- */
[data-theme="dark"] {
    --dark-grey-flat: #F8F9FA;
    --white-flat: #24292e;
    --light-grey-flat: #1a1e22;
    --border-flat: #3a4149;
    --border-dark: #4a525d;
    --shadow-subtle: 0 2px 6px rgba(0, 0, 0, 0.4);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] body {
    background-color: var(--light-grey-flat);
    color: #e2e8f0;
}

[data-theme="dark"] .app-navbar {
    background-color: #24292e;
    border-bottom-color: var(--border-flat);
}

[data-theme="dark"] .app-sidebar {
    background-color: #1a1e22;
    border-right: 1px solid var(--border-flat);
}

[data-theme="dark"] .flat-card {
    background-color: var(--white-flat);
    border-color: var(--border-flat);
}

[data-theme="dark"] .flat-card-header {
    background-color: #2b3137;
    border-bottom-color: var(--border-flat);
}

[data-theme="dark"] .flat-card-title,
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
    color: #f1f5f9;
}

[data-theme="dark"] .form-control {
    background-color: #1a1e22;
    border-color: var(--border-flat);
    color: #f1f5f9;
}

[data-theme="dark"] .flat-table th {
    background-color: #2b3137;
    color: #cbd5e1;
    border-bottom-color: var(--border-flat);
}

[data-theme="dark"] .flat-table td {
    border-bottom-color: var(--border-flat);
    color: #e2e8f0;
}

[data-theme="dark"] .flat-table tr:hover {
    background-color: #2a3036;
}

[data-theme="dark"] .modal-content,
[data-theme="dark"] .modal-box,
[data-theme="dark"] .modal-dialog {
    background-color: #24292e;
    color: #f1f5f9;
}

[data-theme="dark"] .mobile-menu-toggle-btn {
    color: #f1f5f9;
    border-color: var(--border-flat);
}

[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-footer {
    background-color: #2b3137;
    border-color: var(--border-flat);
}

/* Digital Signature Canvas Box (Update_Feature.md Module 2) */
.signature-canvas-wrapper {
    position: relative;
    border: 2px dashed var(--border-flat);
    border-radius: var(--radius-sm);
    background: #ffffff;
    cursor: crosshair;
    touch-action: none;
    overflow: hidden;
}

.signature-canvas-wrapper canvas {
    display: block;
    width: 100%;
    height: 160px;
}

.signature-canvas-actions {
    display: flex;
    justify-content: space-between;
    padding: 6px 10px;
    background: #f8fafc;
    border-top: 1px solid var(--border-flat);
    font-size: 0.8rem;
}

/* Notification Bell Dropdown */
.notification-wrapper {
    position: relative;
}

.notification-bell-btn {
    position: relative;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 6px;
    display: flex;
    align-items: center;
}

.notification-badge {
    position: absolute;
    top: 0px;
    right: 0px;
    background: var(--danger-red);
    color: #ffffff;
    font-size: 10px;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

.notification-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 320px;
    background: var(--white-flat);
    border: 1px solid var(--border-flat);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-hover);
    z-index: 200;
    display: none;
}

.notification-dropdown.show {
    display: block;
}

.notification-dropdown-header {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-flat);
    font-weight: 700;
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
}

.notification-list {
    max-height: 280px;
    overflow-y: auto;
}

.notification-item {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-flat);
    font-size: 0.8rem;
    display: block;
    color: inherit;
    transition: background 0.15s ease;
}

.notification-item:hover {
    background-color: var(--light-grey-flat);
}

.notification-item.unread {
    background-color: #f0f7ff;
    font-weight: 600;
}

/* -----------------------------------------------------------------------------
 * SETTINGS TABBED NAVIGATION (Design.md Flat Corporate Aesthetics)
 * -------------------------------------------------------------------------- */
.settings-tabs-wrapper {
    margin-bottom: 1.5rem;
}

.settings-tabs-nav {
    display: flex;
    gap: 6px;
    border-bottom: 2px solid var(--border-flat);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
    margin-bottom: 1.5rem;
    scrollbar-width: thin;
}

.settings-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark-grey-flat);
    background: #eef2f6;
    border: 1px solid var(--border-flat);
    border-bottom: none;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, color 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
    user-select: none;
}

.settings-tab-btn:hover {
    background: #e2e8f0;
    color: var(--corporate-blue);
}

.settings-tab-btn.active {
    background: var(--white-flat);
    color: var(--corporate-blue);
    border-top: 3px solid var(--corporate-blue);
    border-bottom: 2px solid var(--white-flat);
    margin-bottom: -4px;
    font-weight: 700;
}

.settings-tab-pane {
    display: none;
}

.settings-tab-pane.active {
    display: block;
    animation: fadeIn 0.18s ease-out;
}

.tab-icon {
    font-size: 1.05rem;
    line-height: 1;
}

[data-theme="dark"] .settings-tab-btn {
    background: #1a1e22;
    color: #94a3b8;
    border-color: var(--border-flat);
}

[data-theme="dark"] .settings-tab-btn:hover {
    background: #24292e;
    color: #f1f5f9;
}

[data-theme="dark"] .settings-tab-btn.active {
    background: var(--white-flat);
    color: #38bdf8;
    border-top-color: #38bdf8;
    border-bottom-color: var(--white-flat);
}

/* -----------------------------------------------------------------------------
 * SETTINGS MODULAR TABS & SECTION STYLING
 * -------------------------------------------------------------------------- */
.settings-tabs-wrapper {
    margin-bottom: 20px;
}

.settings-tabs-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px;
    background: #f1f5f9;
    border: 1px solid var(--border-flat);
    border-radius: var(--radius-flat, 6px);
    margin-bottom: 20px;
}

.settings-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-decoration: none;
    white-space: nowrap;
}

.settings-tab-btn:hover {
    background: #e2e8f0;
    color: var(--text-flat);
}

.settings-tab-btn.active {
    background: var(--white-flat);
    color: var(--primary-flat);
    border-color: var(--border-flat);
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.settings-tab-btn svg,
.settings-tab-btn .tab-icon {
    flex-shrink: 0;
}

.settings-tab-pane {
    display: none;
}

.settings-tab-pane.active {
    display: block;
    animation: settingsFadeIn 0.25s ease-out;
}

@keyframes settingsFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.settings-section-card {
    background: var(--white-flat);
    border: 1px solid var(--border-flat);
    border-radius: var(--radius-flat, 6px);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.05));
    margin-bottom: 20px;
    overflow: hidden;
}

.settings-card-footer {
    padding: 16px 20px;
    background: #f8fafc;
    border-top: 1px solid var(--border-flat);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

/* Dark mode overrides */
[data-theme="dark"] .settings-tabs-nav {
    background: #1e293b;
    border-color: #334155;
}

[data-theme="dark"] .settings-tab-btn {
    color: #94a3b8;
}

[data-theme="dark"] .settings-tab-btn:hover {
    background: #334155;
    color: #f1f5f9;
}

[data-theme="dark"] .settings-tab-btn.active {
    background: #0f172a;
    color: #38bdf8;
    border-color: #334155;
}

[data-theme="dark"] .settings-card-footer {
    background: #0f172a;
    border-top-color: #334155;
}

@media (max-width: 768px) {
    .settings-tabs-nav {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 12px;
    }
    .settings-tab-btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
}

/* -----------------------------------------------------------------------------
 * PRINT-OPTIMIZED STYLESHEET (Update_Feature.md Module 5)
 * -------------------------------------------------------------------------- */
@media print {
    .app-sidebar,
    .app-navbar,
    .no-print,
    .btn,
    .sidebar-footer,
    #mobile-menu-toggle {
        display: none !important;
    }

    body, .app-container, .app-main, .app-content {
        margin: 0 !important;
        padding: 0 !important;
        background: #ffffff !important;
        color: #000000 !important;
    }

    .flat-card {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }

    .print-sheet {
        width: 100% !important;
        max-width: 100% !important;
        padding: 10mm !important;
    }
}