:root {
    /* Premium Color Palette (Apple/Stripe Inspired) */
    --bg-main: #FAFAFC;
    --bg-surface: rgba(255, 255, 255, 0.7);
    --bg-solid: #FFFFFF;

    --text-primary: #1A1A24;
    --text-secondary: #5E6278;
    --text-tertiary: #A1A5B7;

    --accent-primary: #4F46E5;
    /* Indigo */
    --accent-hover: #4338CA;
    --accent-light: #EEF2FF;

    --danger: #EF4444;
    --danger-light: #FEF2F2;
    --warning: #F59E0B;
    --warning-light: #FFFBEB;
    --success: #10B981;
    --success-light: #ECFDF5;

    --border-color: rgba(226, 232, 240, 0.8);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;

    /* Elevated Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.02);
    --shadow-float: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* Subtle background grid pattern */
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 24px 24px;
}

/* --- PREMIUM GLASS HEADER --- */
.ribbon-header {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 40px;
    height: auto;
    min-height: 80px;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-right: 40px;
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--accent-primary);
    letter-spacing: -0.5px;
}

.brand-logo .dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    display: inline-block;
}

.ribbon-toolbar {
    display: flex;
    align-items: center;
    gap: 32px;
    height: 100%;
    padding: 16px 0;
    flex: 1;
}

.toolbar-group {
    display: flex;
    align-items: center;
    background: var(--bg-solid);
    padding: 6px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.5);
    gap: 8px;
}

.toolbar-divider {
    width: 1px;
    height: 32px;
    background: var(--border-color);
}

/* Updated premium buttons */
.ribbon-btn {
    background: transparent;
    border: none;
    padding: 10px 16px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    color: var(--text-secondary);
}

.ribbon-btn:hover {
    background: var(--bg-main);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.ribbon-btn.primary-action {
    background: var(--accent-primary);
    color: white;
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.ribbon-btn.primary-action:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.ribbon-btn .icon {
    font-size: 1.1rem;
}

/* --- MODERN SIDEBAR --- */
.legal-sidebar {
    width: 360px;
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    z-index: 50;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 20px 24px 12px;
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.risk-dashboard {
    padding: 0 24px 24px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.risk-stat {
    background: var(--bg-solid);
    border-radius: var(--border-radius-md);
    padding: 16px 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease;
}

.risk-stat:hover {
    transform: translateY(-2px);
}

.risk-stat .val {
    font-size: 1.5rem;
    font-weight: 800;
    display: block;
    margin-bottom: 4px;
}

.risk-stat .lab {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.val.high {
    color: var(--danger);
}

.val.med {
    color: var(--warning);
}

.val.low {
    color: var(--success);
}

/* --- AUDIT BOARD / CRITICAL DATA --- */
.audit-board {
    padding: 0 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.audit-empty {
    padding: 24px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.4);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-md);
}

.audit-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.audit-entity {
    background: var(--bg-solid);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: var(--border-radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
}

.audit-entity:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.entity-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.entity-values {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.entity-values.discrepancy {
    color: var(--danger);
    background: var(--danger-light);
    padding: 4px 8px;
    border-radius: var(--border-radius-sm);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 0 24px 24px;
}

.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 10px;
}

/* Beautiful empty state */
#change-list-container .empty-msg {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-tertiary);
    font-size: 0.9rem;
    line-height: 1.5;
}

#change-list-container .empty-msg::before {
    content: "✌️";
    display: block;
    font-size: 2rem;
    margin-bottom: 12px;
}

.change-item {
    padding: 20px;
    background: var(--bg-solid);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    margin-bottom: 16px;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.change-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    transition: all 0.3s;
}

.change-item.high-risk::before {
    background-color: var(--danger);
}

.change-item.med-risk::before {
    background-color: var(--warning);
}

.change-item.low-risk::before {
    background-color: var(--success);
}

.change-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-color);
}

.change-item.active {
    background: var(--accent-light);
    border-color: var(--accent-primary);
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
}

.change-item.active::before {
    width: 6px;
    background-color: var(--accent-primary);
}

.change-item.approved {
    opacity: 0.6;
}

.change-item.approved::before {
    background-color: var(--success);
}

.change-item.flagged {
    background: var(--warning-light);
    border-color: var(--warning);
}

.change-type {
    font-size: 0.75rem;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.type-added {
    color: var(--success);
}

.type-removed {
    color: var(--danger);
}

.type-update {
    color: var(--warning);
}

.change-snippet {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 500;
    background: #f8fafc;
    padding: 12px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.change-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.action-btn {
    flex: 1;
    border: 1px solid var(--border-color);
    background: var(--bg-solid);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
}

.action-btn:hover {
    background: var(--bg-main);
}

.action-btn.btn-approve:hover {
    color: var(--success);
    border-color: var(--success);
    background: var(--success-light);
}

.action-btn.btn-flag:hover {
    color: var(--warning);
    border-color: var(--warning);
    background: var(--warning-light);
}

/* --- NAV CLUSTER --- */
.nav-cluster {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-btn {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-weight: 700;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.nav-btn:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

#changeCounter {
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 60px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}


/* --- WORKSPACE LAYOUT (Stripe-like) --- */
.app-workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.document-workspace {
    flex: 1;
    display: flex;
    gap: 24px;
    padding: 24px 32px;
}

.view-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-float);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
}

.panel-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 10;
}

.panel-header::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.left-view .panel-header::before {
    background: var(--accent-primary);
}

.right-view .panel-header::before {
    background: var(--warning);
}

.paper-container {
    flex: 1;
    overflow-y: auto !important;
    padding: 85px 40px 40px;
    /* Top padding to account for absolute header */
    display: flex;
    flex-direction: column;
    align-items: center;
    scroll-behavior: auto !important;
}

/* Scrollbar for views */
.paper-container::-webkit-scrollbar {
    width: 8px;
}

.paper-container::-webkit-scrollbar-track {
    background: transparent;
}

.paper-container::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.15);
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

#editor-container,
.pdf-page-canvas {
    background: var(--bg-solid);
    width: 100% !important;
    max-width: 820px;
    min-height: 1160px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
    border-radius: var(--border-radius-md);
    flex-shrink: 0;
    transition: box-shadow 0.3s ease;
}

.pdf-page-canvas {
    width: 100% !important;
    height: auto !important;
}

/* --- QUILL CUSTOMIZATION TO MATCH MODERN FEEL --- */
.ql-container {
    height: auto !important;
    overflow-y: visible !important;
    border: none !important;
    font-family: 'Inter', sans-serif !important;
}

.ql-toolbar.ql-snow {
    display: none;
    /* Hide toolbar for cleaner read-only look originally, or style it if needed */
}

#editor-container {
    border: 1px solid var(--border-color) !important;
}

.ql-editor {
    height: auto !important;
    overflow-y: visible !important;
    padding: 80px 100px !important;
    font-family: inherit !important;
    font-size: 15px !important;
    line-height: 1.8 !important;
    color: var(--text-primary);
    white-space: pre-wrap !important;
}

.ql-editor p {
    margin-bottom: 1.2em !important;
}

.ql-editor h1,
.ql-editor h2,
.ql-editor h3 {
    font-weight: 700;
    color: #111;
    margin-top: 2em;
    margin-bottom: 1em;
}


/* Page Breaks */
.page-separator-block {
    display: flex !important;
    height: 40px !important;
    background: transparent !important;
    margin: 60px -100px !important;
    justify-content: center;
    align-items: center;
    position: relative;
    border: none !important;
    box-shadow: none !important;
}

.page-separator-block::before {
    content: "PAGE BREAK";
    background: var(--bg-main);
    padding: 4px 16px;
    border-radius: 20px;
    color: var(--text-tertiary);
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 2px;
    border: 1px solid var(--border-color);
    z-index: 2;
}

.page-separator-block::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 1px;
    background: var(--border-color);
    z-index: 1;
}

/* --- HIGHLIGHTS --- */
.diff-active {
    background-color: var(--warning-light) !important;
    outline: 2px solid var(--warning);
    outline-offset: 4px;
    border-radius: 2px;
    transition: outline-color 0.2s, background-color 0.2s;
}

/* Utility Animations */
@keyframes slideInRight {
    from {
        transform: translateX(20px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.change-item {
    animation: slideInRight 0.4s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}