/* ==============================================================================
   INVOICE AI REVIEWER — Corporate Financial SaaS Design System
   Tailored for Corporate IT & Finance (e.g. Aryavart Hospital)
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;

    --navy-900: #0f172a;
    --navy-800: #1e293b;
    --navy-700: #334155;

    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;

    --emerald-50: #ecfdf5;
    --emerald-100: #d1fae5;
    --emerald-600: #059669;
    --emerald-700: #047857;
    --emerald-800: #065f46;

    --amber-50: #fffbeb;
    --amber-100: #fef3c7;
    --amber-600: #d97706;
    --amber-700: #b45309;
    --amber-800: #92400e;

    --purple-50: #faf5ff;
    --purple-100: #f3e8ff;
    --purple-600: #9333ea;
    --purple-700: #7e22ce;

    --rose-50: #fff1f2;
    --rose-100: #ffe4e6;
    --rose-600: #e11d48;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--slate-50);
    color: var(--slate-900);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* ==============================================================================
   Main Layout Container (Sidebar + Content)
   ============================================================================== */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ==============================================================================
   Left Sidebar
   ============================================================================== */
.sidebar {
    width: 280px;
    background: linear-gradient(180deg, var(--navy-900) 0%, #0f172a 100%);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    text-decoration: none;
    color: #ffffff;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.brand-title {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-subtitle {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    color: #94a3b8;
    letter-spacing: 0.05em;
    margin-top: 4px;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 1rem;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

.nav-link:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(4px);
}

.nav-link.active {
    color: #ffffff;
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.15), transparent);
    border-left: 3px solid #3b82f6;
}

.nav-badge {
    background: #ef4444;
    color: #ffffff;
    font-size: 0.65rem;
    font-weight: 800;
    padding: 0.15rem 0.45rem;
    border-radius: var(--radius-full);
    margin-left: auto;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.sidebar-footer {
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: #3b82f6;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.user-info {
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.user-name {
    font-weight: 700;
    color: #ffffff;
    font-size: 0.85rem;
}

.role-tag {
    font-size: 0.65rem;
    font-weight: 800;
    padding: 0.1rem 0.4rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    display: inline-block;
    width: fit-content;
    margin-top: 2px;
}

.role-tag.admin { background: #fee2e2; color: #991b1b; }
.role-tag.reviewer { background: #dbeafe; color: #1e40af; }
.role-tag.data_entry { background: #fef3c7; color: #92400e; }
.role-tag.auditor { background: #e2e8f0; color: #334155; }

.btn-logout {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #ffffff;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-logout:hover {
    background: #ef4444;
    color: #ffffff;
}

/* ==============================================================================
   Main Content Area
   ============================================================================== */
.main-content {
    flex: 1;
    overflow-y: auto;
    background-color: var(--slate-50);
    position: relative;
    display: flex;
    flex-direction: column;
}

.main-wrapper {
    width: 100%;
    max-width: 1680px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--navy-900);
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: 0.85rem;
    color: var(--slate-500);
    margin-top: 0.2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.15rem;
    border-radius: var(--radius-md);
    font-size: 0.825rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}

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

.btn-secondary {
    background: #ffffff;
    color: var(--slate-700);
    border-color: var(--slate-300);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
    background: var(--slate-50);
    border-color: var(--slate-400);
}

.btn-success {
    background: var(--emerald-600);
    color: #ffffff;
}

.btn-success:hover {
    background: var(--emerald-700);
}

.btn-danger {
    background: var(--rose-600);
    color: #ffffff;
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
}

/* ==============================================================================
   Metric Cards & Grid
   ============================================================================== */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.75rem;
}

.metric-card {
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-xs);
    position: relative;
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--slate-300);
}

.metric-card.primary::before { background: var(--primary); }
.metric-card.success::before { background: var(--emerald-600); }
.metric-card.warning::before { background: var(--amber-600); }
.metric-card.purple::before { background: var(--purple-600); }

.metric-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--slate-500);
    margin-bottom: 0.35rem;
}

.metric-value {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--navy-900);
    font-family: var(--font-mono);
    line-height: 1.2;
}

.metric-sub {
    font-size: 0.75rem;
    color: var(--slate-500);
    margin-top: 0.4rem;
}

/* ==============================================================================
   Cards & Panels
   ============================================================================== */
.card {
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    margin-bottom: 1.75rem;
    overflow: hidden;
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--slate-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #ffffff;
}

.card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--navy-900);
}

.card-desc {
    font-size: 0.75rem;
    color: var(--slate-500);
    margin-top: 0.15rem;
}

.card-body {
    padding: 1.5rem;
}

/* ==============================================================================
   Tables
   ============================================================================== */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    text-align: left;
}

.data-table th {
    background: var(--slate-100);
    padding: 0.65rem 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.68rem;
    letter-spacing: 0.05em;
    color: var(--slate-600);
    border-bottom: 1px solid var(--slate-200);
    white-space: nowrap;
}

.data-table td {
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--slate-100);
    color: var(--slate-800);
    vertical-align: middle;
}

.data-table tr:hover td {
    background: #f8fafc;
}

/* ==============================================================================
   Classification Badges & Pills
   ============================================================================== */
.badge-classification {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.badge-classification.fixed-asset {
    background: var(--emerald-100);
    color: var(--emerald-800);
    border: 1px solid #a7f3d0;
}

.badge-classification.component {
    background: var(--purple-100);
    color: var(--purple-700);
    border: 1px solid #e9d5ff;
}

.badge-classification.expense {
    background: var(--slate-200);
    color: var(--slate-700);
    border: 1px solid var(--slate-300);
}

.badge-classification.manual-review {
    background: var(--amber-100);
    color: var(--amber-800);
    border: 1px solid #fde68a;
    animation: pulseSlow 2.5s infinite;
}

@keyframes pulseSlow {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.badge-confidence {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.15rem 0.45rem;
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-confidence.high { background: #dcfce7; color: #15803d; }
.badge-confidence.medium { background: #fef3c7; color: #b45309; }
.badge-confidence.low { background: #fee2e2; color: #b91c1c; }

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
}

.status-pill.approved { background: #d1fae5; color: #065f46; }
.status-pill.pending { background: #fef3c7; color: #92400e; }
.status-pill.overridden { background: #dbeafe; color: #1e40af; }

/* ==============================================================================
   Invoice Review Split-Pane Layout
   ============================================================================== */
.review-workspace {
    display: grid;
    grid-template-columns: 290px minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
}

#review-detail-pane {
    min-width: 0;
    width: 100%;
}

@media (max-width: 1024px) {
    .review-workspace {
        grid-template-columns: 1fr;
    }
}

.invoice-sidebar {
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 120px);
    max-height: 850px;
    position: sticky;
    top: 1.5rem;
}

.invoice-sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.65rem;
    padding-bottom: 0.65rem;
    border-bottom: 1px solid var(--slate-100);
}

.sidebar-search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.sidebar-search-box .search-icon {
    position: absolute;
    left: 0.75rem;
    color: var(--slate-400);
    pointer-events: none;
}

.sidebar-search-input {
    padding-left: 2rem !important;
    font-size: 0.775rem !important;
    height: 34px;
}

.sidebar-filter-select {
    font-size: 0.75rem !important;
    height: 32px;
    padding: 0.25rem 0.6rem !important;
    color: var(--slate-600) !important;
    background-color: var(--slate-50) !important;
}

.invoice-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    padding-right: 4px;
}

.invoice-list::-webkit-scrollbar {
    width: 5px;
}

.invoice-list::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

.invoice-list::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.invoice-card-item {
    padding: 0.75rem 0.85rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--slate-200);
    background: #ffffff;
    cursor: pointer;
    transition: all 0.15s ease;
}

.invoice-card-item:hover {
    border-color: var(--slate-300);
    background: var(--slate-50);
}

.invoice-card-item.selected {
    border-color: var(--primary);
    background: #eff6ff;
    box-shadow: 0 0 0 1px var(--primary);
}

/* ==============================================================================
   Tax Summary & Duplicate Banners
   ============================================================================== */
.tax-summary-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    background: #f8fafc;
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--slate-200);
}

@media (max-width: 900px) {
    .tax-summary-strip {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.tax-summary-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.tax-summary-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--slate-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.tax-summary-label.highlight {
    color: var(--primary);
    font-weight: 700;
}

.tax-summary-value {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--navy-900);
    letter-spacing: -0.01em;
}

.tax-summary-value.total {
    color: var(--primary);
    font-weight: 800;
    font-size: 1rem;
}

.duplicate-warning-banner {
    margin-top: 0.85rem;
    padding: 0.75rem 1rem;
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: var(--radius-md);
    font-size: 0.775rem;
    color: #92400e;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    line-height: 1.4;
}

.duplicate-badge {
    background: #f59e0b;
    color: #ffffff;
    font-weight: 800;
    font-size: 0.65rem;
    padding: 0.15rem 0.45rem;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    flex-shrink: 0;
}

/* ==============================================================================
   Modal System
   ============================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

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

.modal-container {
    background: #ffffff;
    border-radius: var(--radius-lg);
    max-width: 650px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.2s ease;
}

.modal-overlay.active .modal-container {
    transform: scale(1);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--slate-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    background: var(--slate-50);
    border-top: 1px solid var(--slate-200);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* ==============================================================================
   Forms & Inputs
   ============================================================================== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--slate-700);
    margin-bottom: 0.35rem;
}

.form-control {
    width: 100%;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    font-size: 0.825rem;
    font-family: inherit;
    color: var(--slate-900);
    background: #ffffff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

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

/* ==============================================================================
   Upload Area & Dropzone
   ============================================================================== */
.dropzone {
    border: 2px dashed var(--slate-300);
    border-radius: var(--radius-lg);
    background: var(--slate-50);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.dropzone-icon {
    width: 48px;
    height: 48px;
    color: var(--primary);
    margin: 0 auto 1rem auto;
}

/* ==============================================================================
   Footer
   ============================================================================== */
.main-footer {
    background: #ffffff;
    border-top: 1px solid var(--slate-200);
    padding: 1.5rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--slate-500);
    margin-top: auto;
}