:root {
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --border: #e2e8f0;
    --border-light: #edf2f7;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-white: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --accent: #059669;
    --accent-hover: #047857;
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-page);
    color: var(--text-main);
    font-size: 14px;
    line-height: 1.5;
}

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

.sidebar {
    width: 250px;
    background: var(--sidebar-bg);
    color: #cbd5e1;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid #1e293b;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    font-size: 24px;
}

.brand-name {
    font-size: 18px;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 1px;
}

.brand-badge {
    display: block;
    font-size: 10px;
    color: #38bdf8;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: #94a3b8;
    text-decoration: none;
    border-radius: 6px;
    margin-bottom: 4px;
    font-weight: 500;
    transition: all 0.15s ease;
}

.nav-item:hover {
    background: var(--sidebar-hover);
    color: #ffffff;
}

.nav-item.active {
    background: var(--primary);
    color: #ffffff;
    font-weight: 600;
}

.nav-icon {
    font-size: 16px;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid #1e293b;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    overflow: hidden;
}

.user-role {
    display: block;
    font-size: 10px;
    text-transform: uppercase;
    color: #38bdf8;
    font-weight: 700;
}

.user-email {
    display: block;
    font-size: 12px;
    color: #cbd5e1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-logout {
    background: transparent;
    border: none;
    color: #94a3b8;
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}

.btn-logout:hover {
    background: var(--sidebar-hover);
    color: #ffffff;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar-left {
    display: flex;
    align-items: baseline;
    gap: 16px;
}

.topbar-left h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
}

.company-badge {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--border-light);
    padding: 3px 10px;
    border-radius: 9999px;
    font-weight: 500;
}

.content-body {
    padding: 28px 32px;
    overflow-y: auto;
    flex: 1;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 26px;
    font-weight: 800;
    color: var(--text-main);
    margin: 8px 0 4px 0;
}

.stat-value.highlight {
    color: var(--primary);
}

.stat-value.text-success {
    color: var(--accent);
}

.stat-sub {
    font-size: 12px;
    color: var(--text-muted);
}

/* Section Card */
.section-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 28px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
}

.card-header h2, .card-header h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.data-table th, .data-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-light);
    text-align: left;
}

.data-table th {
    background: #f8fafc;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.tfoot-total th {
    font-size: 14px;
    font-weight: 700;
    border-top: 2px solid var(--border);
    color: var(--text-main);
}

.text-right { text-align: right !important; }
.text-center { text-align: center !important; }
.text-muted { color: var(--text-muted); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    border: none;
    transition: all 0.15s ease;
    text-decoration: none;
}

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

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

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

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

.btn-secondary {
    background: #e2e8f0;
    color: #334155;
}

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

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

.link-btn {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 600;
    background: #e2e8f0;
    color: #475569;
}

.badge.badge-success {
    background: #dcfce7;
    color: #166534;
}

.badge.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}

.modal-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 28px;
    width: 90%;
    max-width: 440px;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.2);
}

.modal-card.modal-lg {
    max-width: 860px;
}

.modal-header {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
}

.brand-logo {
    display: inline-block;
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 12px;
    font-size: 14px;
    letter-spacing: 1px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 4px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 600;
    color: #334155;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    background: #ffffff;
}

.form-row {
    display: flex;
    gap: 16px;
}

.col-4 {
    flex: 1;
}

.error-box {
    background: #fee2e2;
    color: #991b1b;
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 13px;
}

/* Sub-tabs */
.tabs-subnav {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
}

.subtab-btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: #ffffff;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
}

.subtab-btn.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

/* GST Banner & Grid */
.gst-banner {
    background: linear-gradient(135deg, #1e3a8a, #0f172a);
    color: #ffffff;
    border-radius: 8px;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.gst-banner-text h2 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
}

.gst-banner-text p {
    font-size: 13px;
    color: #93c5fd;
    max-width: 580px;
}

.gst-export-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.gst-export-controls input {
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid #475569;
    background: #ffffff;
    font-size: 13px;
}

.gstr3b-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 14px;
}

.gstr-box {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
}

.gstr-box .label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

.gstr-box .val {
    display: block;
    font-size: 20px;
    font-weight: 800;
    color: var(--text-main);
    margin-top: 6px;
}

.gstr-box .val.highlight {
    color: var(--accent);
}

.checksum-box {
    margin-top: 20px;
    padding: 14px 18px;
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    border-radius: 6px;
    color: #065f46;
    font-size: 13px;
}

.hidden {
    display: none !important;
}

/* -------------------------------------------------------------
 * Tally Built-in & Rapid-Entry UI
 * ------------------------------------------------------------- */
.tally-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.tally-main-panel {
    flex: 1;
}

.gateway-box {
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 8px;
    border: 2px solid #334155;
    padding: 24px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.gateway-header {
    text-align: center;
    border-bottom: 2px solid #1e293b;
    padding-bottom: 12px;
    margin-bottom: 20px;
}

.gateway-header h2 {
    font-size: 18px;
    font-weight: 800;
    color: #38bdf8;
    letter-spacing: 2px;
}

.gateway-sections {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.gateway-group h4 {
    font-size: 13px;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
    border-bottom: 1px solid #1e293b;
    padding-bottom: 4px;
}

.gateway-menu-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    margin-bottom: 4px;
    background: #1e293b;
    border-radius: 4px;
    color: #f1f5f9;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.15s ease;
}

.gateway-menu-item:hover, .gateway-menu-item.selected {
    background: #2563eb;
    color: #ffffff;
    transform: translateX(4px);
}

.gateway-menu-item .key-hint {
    background: #334155;
    color: #f59e0b;
    font-family: monospace;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
}

.gateway-menu-item:hover .key-hint {
    background: #1d4ed8;
    color: #ffffff;
}

/* Tally Right-side F-Key Button Panel */
.tally-fkey-panel {
    width: 220px;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
}

.tally-fkey-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 6px;
    color: #e2e8f0;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    transition: all 0.15s ease;
}

.tally-fkey-btn:hover {
    background: #2563eb;
    border-color: #3b82f6;
    color: #ffffff;
}

.fkey-badge {
    background: #334155;
    color: #38bdf8;
    font-family: monospace;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 4px;
}

.tally-fkey-btn:hover .fkey-badge {
    background: #1e40af;
    color: #ffffff;
}

/* -------------------------------------------------------------
 * GST 2B Reconciliation & IMS Styles
 * ------------------------------------------------------------- */
.recon-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.recon-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px;
    position: relative;
    overflow: hidden;
}

.recon-card.exact { border-left: 5px solid #10b981; }
.recon-card.probable { border-left: 5px solid #f59e0b; }
.recon-card.missing-2b { border-left: 5px solid #ef4444; }
.recon-card.missing-books { border-left: 5px solid #3b82f6; }

.recon-card-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-muted);
}

.recon-card-value {
    font-size: 24px;
    font-weight: 800;
    margin: 8px 0 4px;
    color: var(--text-main);
}

.recon-card-sub {
    font-size: 12px;
    color: var(--text-muted);
}

.ims-badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
}

.ims-badge.pending { background: #fef3c7; color: #92400e; }
.ims-badge.accepted { background: #d1fae5; color: #065f46; }
.ims-badge.rejected { background: #fee2e2; color: #991b1b; }

.btn-ims {
    padding: 4px 8px;
    font-size: 11px;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: #ffffff;
    cursor: pointer;
    margin-right: 4px;
}
.btn-ims:hover { background: #f1f5f9; }

/* -------------------------------------------------------------
 * Granular RBAC Permission Matrix Styles
 * ------------------------------------------------------------- */
.perm-matrix-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 14px;
}

.perm-module-card {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 14px;
}

.perm-module-card h4 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 4px;
}

.perm-checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 6px;
    font-size: 12px;
}

.perm-checkbox-item input {
    margin-top: 2px;
}

/* ==========================================================================
   Dark Mode Theme System
   ========================================================================== */
[data-theme="dark"] {
    --bg-page: #0b1120;
    --bg-card: #1e293b;
    --border: #334155;
    --border-light: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --sidebar-bg: #070d17;
    --sidebar-hover: #1e293b;
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background-color: #0f172a;
    color: #f8fafc;
    border-color: #334155;
}

[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
    border-color: var(--primary);
    background-color: #172554;
}

[data-theme="dark"] .table th {
    background-color: #0f172a;
    color: #94a3b8;
    border-color: #334155;
}

[data-theme="dark"] .table td {
    border-color: #334155;
}

[data-theme="dark"] .table tr:hover {
    background-color: #1e293b;
}

[data-theme="dark"] .modal-card {
    background-color: #1e293b;
    border: 1px solid #334155;
    color: #f8fafc;
}

[data-theme="dark"] .topbar {
    background-color: #0f172a;
    border-bottom: 1px solid #1e293b;
}

[data-theme="dark"] .stat-card {
    background-color: #1e293b;
    border-color: #334155;
}

[data-theme="dark"] .stat-card .stat-value {
    color: #f8fafc;
}

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

[data-theme="dark"] .btn-secondary {
    background: #1e293b;
    color: #f8fafc;
    border-color: #334155;
}

[data-theme="dark"] .btn-secondary:hover {
    background: #334155;
}