/**
 * CBT Modern Application Styles — DJI Design Language Edition
 * Grounded on DESIGN-dji.md specification:
 * - Studio-clean white canvas & soft grey surfaces
 * - Engineering Blue (#0070d5 / #0060ef) action pills
 * - Restrained typography in Open Sans with negative tracking (-0.02em to -0.03em)
 * - Near-black ink hierarchy (#262626 / #595959 / #8c8c8c)
 * - 8px rounded cards/modals/forms with subtle 1px borders (#e8e8e8 / #d9d9d9)
 * - Restrained Tier-Orange (#be4e04) eyebrows
 */

@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap');

:root {
    /* DJI Brand & Accent Colors */
    --dji-primary: #0070d5;          /* DJI Blue — Brand pill, active selector, announcement link */
    --dji-store-blue: #0060ef;       /* Store Buy Now, selected option border, store links */
    --dji-store-blue-tint: #deeafd;  /* Add to Cart / soft blue tint fill */
    --dji-on-primary: #ffffff;       /* Text on blue and dark pills */
    --dji-link-blue: #1890ff;        /* Text link blue */
    --dji-tier-orange: #be4e04;      /* Eyebrow rank ("SKD CPNS", "PermenPAN-RB", etc.) */
    --dji-badge-orange: #fa8c16;     /* Accent badge orange */
    --dji-error: #f5222d;            /* Error / Alert red */

    /* DJI Surfaces */
    --dji-canvas: #ffffff;           /* Page canvas, cards, navbar */
    --dji-canvas-soft: #f7f9fa;      /* Feature bands, panels, table headers, soft footer */
    --dji-panel: #f6f8f9;            /* Benefits panel, secondary cards */
    --dji-fog: #f5f5f5;              /* Card backdrops, subtle contrast */
    --dji-announce: #fafafa;         /* Announcement strip */
    --dji-footer: #272727;           /* Charcoal footer */
    --dji-footer-pill: #383838;      /* Footer pills */
    --dji-footer-divider: #414141;   /* Footer borders */

    /* DJI Lines & Borders */
    --dji-hairline: #f0f0f0;         /* Tab track rule */
    --dji-divider: #e8e8e8;          /* Standard dividers */
    --dji-card-border: #d9d9d9;      /* Option cards */
    --dji-dashed-border: #dddddd;    /* Inactive / dashed border */
    --dji-input-border: #d4d7d9;     /* Form inputs */
    --dji-control-border: #cccccc;   /* Checkboxes & controls */

    /* DJI Text & Ink (No pure black!) */
    --dji-ink: #262626;              /* Headings and body text (black at 85%) */
    --dji-ink-secondary: #595959;    /* Secondary text, inactive items (black at 65%) */
    --dji-ink-tertiary: #8c8c8c;     /* Eyebrows, hints (black at 45%) */
    --dji-graphite: #3b3e40;         /* Body copy and sections */
    --dji-nav-ink: #303233;          /* Nav text */
    --dji-slate: #6c7073;            /* Input text, subdued labels */
    --dji-steel: #9fa3a6;            /* Spec captions */
    --dji-footer-link: #b3b3b3;      /* Footer links */

    /* Typography & Tracking */
    --dji-font: 'Open Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --dji-tracking-body: -0.02em;
    --dji-tracking-heading: -0.03em;

    /* Radii Scale */
    --dji-radius-xs: 4px;
    --dji-radius-sm: 8px;            /* Cards, modals, form fields, panels */
    --dji-radius-pill: 100px;        /* Standard pill buttons */
    --dji-radius-full: 9999px;       /* Large pills */

    /* Backwards-compatibility Aliases */
    --cbt-primary: var(--dji-primary);
    --cbt-primary-hover: var(--dji-store-blue);
    --cbt-primary-light: var(--dji-store-blue-tint);
    --cbt-success: #15803d;
    --cbt-success-light: #f0fdf4;
    --cbt-warning: #b45309;
    --cbt-warning-light: #fffbeb;
    --cbt-danger: var(--dji-error);
    --cbt-danger-light: #fef2f2;
    --cbt-gray-50: var(--dji-canvas-soft);
    --cbt-gray-100: var(--dji-fog);
    --cbt-gray-200: var(--dji-divider);
    --cbt-gray-300: var(--dji-card-border);
    --cbt-gray-600: var(--dji-ink-secondary);
    --cbt-gray-800: var(--dji-ink);
    --cbt-gray-900: var(--dji-ink);
    --cbt-radius: var(--dji-radius-sm);
    --cbt-font: var(--dji-font);
}

/* ------------------------------------------------------------------
   1. GLOBAL RESETS & BACKGROUND
   ------------------------------------------------------------------ */
body {
    font-family: var(--dji-font);
    background-color: var(--dji-canvas-soft);
    color: var(--dji-ink);
    letter-spacing: var(--dji-tracking-body);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--dji-font);
    font-weight: 600;
    color: var(--dji-ink);
    letter-spacing: var(--dji-tracking-heading);
}

p, span, div, td, th, li {
    letter-spacing: var(--dji-tracking-body);
}

a {
    color: var(--dji-primary);
    text-decoration: none;
    transition: color 0.15s ease;
}
a:hover {
    color: var(--dji-store-blue);
    text-decoration: none;
}

/* ------------------------------------------------------------------
   2. BUTTONS (DJI PILL ARCHITECTURE)
   Every interactive CTA is a rounded pill
   ------------------------------------------------------------------ */
.btn {
    font-family: var(--dji-font);
    font-weight: 500;
    font-size: 14px;
    line-height: 1.25;
    letter-spacing: -0.32px;
    border-radius: var(--dji-radius-pill);
    padding: 9px 20px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    transition: all 0.15s ease-in-out;
    box-shadow: none !important;
}

.btn:active {
    transform: scale(0.98);
}

/* Primary Pill (#0070d5) */
.btn-primary {
    background-color: var(--dji-primary);
    border-color: var(--dji-primary);
    color: var(--dji-on-primary);
}
.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--dji-store-blue);
    border-color: var(--dji-store-blue);
    color: var(--dji-on-primary);
}

/* Secondary / Outline Pill (1px ink outline) */
.btn-outline-primary {
    background-color: transparent;
    border: 1px solid var(--dji-primary);
    color: var(--dji-primary);
}
.btn-outline-primary:hover,
.btn-outline-primary:focus {
    background-color: var(--dji-store-blue-tint);
    border-color: var(--dji-primary);
    color: var(--dji-primary);
}

.btn-outline-secondary {
    background-color: transparent;
    border: 1px solid var(--dji-ink);
    color: var(--dji-ink);
}
.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
    background-color: var(--dji-fog);
    border-color: var(--dji-ink);
    color: var(--dji-ink);
}

/* Store Blue Pill (#0060ef) */
.btn-store-blue {
    background-color: var(--dji-store-blue);
    border-color: var(--dji-store-blue);
    color: var(--dji-on-primary);
    border-radius: var(--dji-radius-full);
}
.btn-store-blue:hover {
    background-color: #0050c9;
    color: var(--dji-on-primary);
}

/* Store Blue Tint (Soft Blue Fill) */
.btn-tint,
.btn-store-cart {
    background-color: var(--dji-store-blue-tint);
    border-color: transparent;
    color: var(--dji-store-blue);
}
.btn-tint:hover,
.btn-store-cart:hover {
    background-color: #cddffc;
    color: var(--dji-store-blue);
}

/* Success Pill */
.btn-success {
    background-color: #15803d;
    border-color: #15803d;
    color: #ffffff;
}
.btn-success:hover {
    background-color: #166534;
    border-color: #166534;
}

/* Danger Pill */
.btn-danger {
    background-color: var(--dji-error);
    border-color: var(--dji-error);
    color: #ffffff;
}
.btn-danger:hover {
    background-color: #cf1322;
    border-color: #cf1322;
}

/* Small Buttons (32px height) */
.btn-sm {
    height: 32px;
    padding: 5px 14px;
    font-size: 13px;
    border-radius: var(--dji-radius-pill);
}

/* Large Buttons (48px height) */
.btn-lg {
    height: 48px;
    padding: 12px 28px;
    font-size: 16px;
    border-radius: var(--dji-radius-full);
}

.btn-light {
    background-color: var(--dji-fog);
    border-color: var(--dji-divider);
    color: var(--dji-ink);
}
.btn-light:hover {
    background-color: var(--dji-divider);
    color: var(--dji-ink);
}

/* ------------------------------------------------------------------
   3. FORMS & INPUTS (DJI Restrained Form Architecture)
   ------------------------------------------------------------------ */
.form-group {
    margin-bottom: 20px;
}

label {
    font-size: 12px;
    font-weight: 600;
    color: var(--dji-ink-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    display: inline-block;
}

.form-control {
    font-family: var(--dji-font);
    font-size: 14px;
    letter-spacing: -0.28px;
    color: var(--dji-ink);
    background-color: var(--dji-canvas);
    border: 1px solid var(--dji-input-border);
    border-radius: var(--dji-radius-sm);
    height: 42px;
    padding: 8px 14px;
    box-shadow: none !important;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: var(--dji-primary);
    box-shadow: 0 0 0 3px rgba(0, 112, 213, 0.12) !important;
    background-color: #ffffff;
    color: var(--dji-ink);
}

.form-control::placeholder {
    color: var(--dji-steel);
    font-size: 14px;
}

select.form-control {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23595959' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 14px;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    padding-right: 36px;
}

textarea.form-control {
    height: auto;
    padding: 10px 14px;
}

/* ------------------------------------------------------------------
   4. MODALS (ex-modal-card)
   ------------------------------------------------------------------ */
.modal-content {
    background-color: var(--dji-canvas);
    border: 1px solid var(--dji-divider);
    border-radius: var(--dji-radius-sm);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.modal-header {
    background-color: var(--dji-canvas);
    border-bottom: 1px solid var(--dji-divider);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dji-ink);
    letter-spacing: -0.4px;
    margin: 0;
}

.modal-header .close {
    padding: 1rem;
    margin: -1rem -1rem -1rem auto;
    color: var(--dji-ink-secondary);
    opacity: 0.6;
    font-size: 1.5rem;
    font-weight: 300;
    transition: opacity 0.15s ease;
}
.modal-header .close:hover {
    opacity: 1;
    color: var(--dji-ink);
}

.modal-body {
    padding: 24px;
    color: var(--dji-ink);
}

.modal-footer {
    background-color: var(--dji-canvas-soft);
    border-top: 1px solid var(--dji-divider);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

/* ------------------------------------------------------------------
   5. CARDS, PANELS & KPI TILES
   ------------------------------------------------------------------ */
.card {
    background-color: var(--dji-canvas);
    border: 1px solid var(--dji-divider);
    border-radius: var(--dji-radius-sm);
    box-shadow: none;
    transition: border-color 0.15s ease-in-out;
}

.card-header {
    background-color: var(--dji-canvas);
    border-bottom: 1px solid var(--dji-divider);
    padding: 16px 20px;
}

.card-footer {
    background-color: var(--dji-canvas-soft);
    border-top: 1px solid var(--dji-divider);
    padding: 14px 20px;
}

.kpi-card {
    background-color: var(--dji-canvas);
    border: 1px solid var(--dji-divider);
    border-radius: var(--dji-radius-sm);
    padding: 20px;
    transition: transform 0.15s ease, border-color 0.15s ease;
}
.kpi-card:hover {
    transform: translateY(-2px);
    border-color: var(--dji-card-border);
}

/* Eyebrows & Badges */
.tier-eyebrow {
    color: var(--dji-tier-orange);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
    display: block;
}

.tile-eyebrow {
    color: var(--dji-ink-tertiary);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: -0.28px;
}

.badge {
    font-family: var(--dji-font);
    font-weight: 600;
    font-size: 12px;
    line-height: 1.33;
    letter-spacing: -0.24px;
    padding: 4px 10px;
    border-radius: var(--dji-radius-xs);
}

.badge-pill {
    border-radius: var(--dji-radius-pill);
}

.badge-primary {
    background-color: var(--dji-primary);
    color: #ffffff;
}
.badge-secondary {
    background-color: var(--dji-fog);
    color: var(--dji-ink-secondary);
}
.badge-success {
    background-color: #dcfce7;
    color: #15803d;
}
.badge-warning {
    background-color: #fef3c7;
    color: #b45309;
}
.badge-danger {
    background-color: #fee2e2;
    color: #b91c1c;
}
.badge-info {
    background-color: var(--dji-store-blue-tint);
    color: var(--dji-store-blue);
}

/* Subtest Specific Badges */
.badge-twk {
    background-color: #fee2e2;
    color: #991b1b;
}
.badge-tiu {
    background-color: #e0e7ff;
    color: #3730a3;
}
.badge-tkp {
    background-color: #dcfce7;
    color: #166534;
}

/* Token Box (Engineered Monospace) */
.token-badge {
    font-family: 'JetBrains Mono', 'Roboto Mono', monospace;
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 2px;
    background: var(--dji-canvas-soft);
    color: var(--dji-primary);
    padding: 4px 12px;
    border-radius: var(--dji-radius-xs);
    border: 1px solid var(--dji-card-border);
    display: inline-block;
}

/* ------------------------------------------------------------------
   6. TABLES (ex-data-table-cell)
   ------------------------------------------------------------------ */
.table {
    color: var(--dji-ink);
    margin-bottom: 0;
}

.table thead th {
    background-color: var(--dji-canvas-soft);
    color: var(--dji-ink-secondary);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-top: none;
    border-bottom: 1px solid var(--dji-divider);
    padding: 14px 18px;
    vertical-align: middle;
}

.table tbody td {
    padding: 16px 18px;
    vertical-align: middle;
    border-top: none;
    border-bottom: 1px solid var(--dji-divider);
    font-size: 14px;
}

.table-hover tbody tr:hover {
    background-color: var(--dji-canvas-soft);
}

/* ------------------------------------------------------------------
   7. NAVBAR (DJI Nav-Bar)
   ------------------------------------------------------------------ */
.cbt-navbar,
nav.navbar {
    background-color: var(--dji-canvas);
    border-bottom: 1px solid var(--dji-divider);
    height: 64px;
    padding: 0 24px;
    box-shadow: none !important;
}

.navbar-brand {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.32px;
    color: var(--dji-ink) !important;
}

.admin-sidebar-nav .nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--dji-ink-secondary);
    padding: 7px 14px;
    border-radius: var(--dji-radius-pill);
    margin-right: 4px;
    transition: all 0.15s ease-in-out;
}

.admin-sidebar-nav .nav-link:hover {
    color: var(--dji-primary);
    background-color: var(--dji-canvas-soft);
}

.admin-sidebar-nav .nav-link.active {
    color: var(--dji-on-primary) !important;
    background-color: var(--dji-primary) !important;
}

/* ------------------------------------------------------------------
   8. EXAM ROOM SPECIFIC COMPONENTS (option-card & CBT Engine)
   ------------------------------------------------------------------ */
.cbt-header {
    background-color: var(--dji-canvas);
    border-bottom: 1px solid var(--dji-divider);
    padding: 14px 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.cbt-timer {
    font-family: var(--dji-font);
    font-size: 1.25rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.4px;
    color: var(--dji-on-primary);
    background-color: var(--dji-primary);
    padding: 6px 18px;
    border-radius: var(--dji-radius-pill);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 14px rgba(0, 112, 213, 0.18);
}

.cbt-timer.timer-warning {
    background-color: var(--dji-error);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.88; transform: scale(1.02); }
}

.cbt-question-card {
    background-color: var(--dji-canvas);
    border-radius: var(--dji-radius-sm);
    border: 1px solid var(--dji-divider);
    padding: 28px;
    margin-bottom: 24px;
}

.cbt-stem {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 24px;
    color: var(--dji-ink);
}

/* DJI Option Cards (option-card & option-card-active) */
.cbt-option {
    display: flex;
    align-items: flex-start;
    padding: 16px 20px;
    margin-bottom: 12px;
    border: 1px solid var(--dji-card-border);
    border-radius: var(--dji-radius-sm);
    background-color: var(--dji-canvas);
    cursor: pointer;
    transition: all 0.15s ease-in-out;
    user-select: none;
}

.cbt-option:hover {
    border-color: var(--dji-primary);
    background-color: var(--dji-canvas-soft);
}

.cbt-option.selected {
    border: 2px solid var(--dji-store-blue);
    padding: 15px 19px; /* adjust for 2px border */
    background-color: var(--dji-canvas-soft);
}

.cbt-option-letter {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--dji-fog);
    border: 1px solid var(--dji-card-border);
    border-radius: var(--dji-radius-pill);
    font-weight: 600;
    font-size: 13px;
    color: var(--dji-ink);
    margin-right: 14px;
    flex-shrink: 0;
    transition: all 0.15s ease;
}

.cbt-option.selected .cbt-option-letter {
    background-color: var(--dji-store-blue);
    color: #ffffff;
    border-color: var(--dji-store-blue);
}

.cbt-option-text {
    flex-grow: 1;
    font-size: 1.02rem;
    line-height: 1.5;
    padding-top: 3px;
    color: var(--dji-ink);
}

/* Zero-Scroll Exam Room Master Layout (Fixed Viewport) */
.cbt-exam-viewport {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background-color: var(--dji-canvas-soft);
    z-index: 30;
}

.cbt-exam-workspace {
    flex: 1 1 0%;
    height: calc(100vh - 64px);
    max-height: calc(100vh - 64px);
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 16px;
    box-sizing: border-box;
    display: flex;
    flex-direction: row;
    gap: 16px;
    align-items: stretch;
    overflow: hidden;
}

/* Sisi Kiri: Lembar Soal (Mengambil sisa lebar secara dinamis di sebelah kiri) */
.cbt-question-card {
    flex: 1 1 0%;
    min-width: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-color: var(--dji-canvas);
    border: 1px solid var(--dji-divider);
    border-radius: 16px;
    padding: 20px 24px;
    box-sizing: border-box;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.cbt-question-card-header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 12px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--dji-hairline);
}

.cbt-question-card-body {
    flex: 1 1 0%;
    min-height: 0;
    overflow-y: auto;
    padding-right: 8px;
}

.cbt-question-card-footer {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-top: 14px;
    border-top: 1px solid var(--dji-hairline);
}

/* Sisi Kanan: Panel Navigator Nomor Soal (Tepat di sebelah kanan, lebar 350px) */
.cbt-navigator-card {
    width: 350px;
    min-width: 350px;
    max-width: 350px;
    flex-shrink: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-color: var(--dji-canvas);
    border: 1px solid var(--dji-divider);
    border-radius: 16px;
    padding: 14px;
    box-sizing: border-box;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.cbt-nav-card-header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 8px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--dji-hairline);
}

.cbt-nav-card-legend {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    color: var(--dji-ink-secondary);
    padding-bottom: 8px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--dji-hairline);
}

.cbt-nav-grid-wrapper {
    flex: 1 1 0%;
    min-height: 0;
    overflow-y: auto;
    padding: 2px;
}

.cbt-nav-card-footer {
    flex-shrink: 0;
    padding-top: 10px;
    border-top: 1px solid var(--dji-hairline);
}

/* Question Navigator Grid */
.cbt-nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    max-height: 480px;
    overflow-y: auto;
    padding-right: 4px;
}

/* 10-Column Compact Navigator Grid (Zero-Scroll CAT Standard) */
.cbt-nav-grid-10 {
    display: grid;
    grid-template-columns: repeat(10, minmax(0, 1fr));
    gap: 4px;
}

.cbt-nav-btn-sm {
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 11px;
    border-radius: var(--dji-radius-xs);
    border: 1px solid var(--dji-card-border);
    background-color: var(--dji-canvas);
    color: var(--dji-ink);
    cursor: pointer;
    transition: all 0.12s ease;
    user-select: none;
    -webkit-user-select: none;
}

.cbt-nav-btn-sm:hover {
    background-color: var(--dji-fog);
    border-color: var(--dji-primary);
}

.cbt-nav-btn-sm.nav-answered {
    background-color: var(--dji-primary);
    color: #ffffff;
    border-color: var(--dji-primary);
}

.cbt-nav-btn-sm.nav-flagged {
    background-color: #f59e0b;
    color: #ffffff;
    border-color: #d97706;
}

.cbt-nav-btn-sm.nav-active {
    box-shadow: 0 0 0 2px var(--dji-store-blue);
    font-weight: 700;
    border-color: var(--dji-store-blue);
    position: relative;
    z-index: 2;
}

.cbt-nav-btn {
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--dji-radius-xs);
    border: 1px solid var(--dji-card-border);
    background-color: var(--dji-canvas);
    color: var(--dji-ink);
    cursor: pointer;
    transition: all 0.1s ease;
}

.cbt-nav-btn:hover {
    background-color: var(--dji-fog);
}

.cbt-nav-btn.nav-answered {
    background-color: var(--dji-primary);
    color: #ffffff;
    border-color: var(--dji-primary);
}

.cbt-nav-btn.nav-flagged {
    background-color: var(--dji-badge-orange);
    color: #ffffff;
    border-color: var(--dji-badge-orange);
}

.cbt-nav-btn.nav-active {
    box-shadow: 0 0 0 2px var(--dji-store-blue);
    font-weight: 700;
}

/* Autosave Indicator */
.cbt-autosave {
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--dji-ink-secondary);
}
.cbt-autosave.saved { color: #15803d; }
.cbt-autosave.saving { color: var(--dji-badge-orange); }
.cbt-autosave.error { color: var(--dji-error); }

/* Flag Pill Button */
.cbt-flag-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: var(--dji-radius-pill);
    border: 1px solid var(--dji-card-border);
    background-color: var(--dji-canvas);
    color: var(--dji-ink);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.15s ease;
}
.cbt-flag-btn:hover {
    background-color: var(--dji-fog);
}
.cbt-flag-btn.active {
    background-color: #fff7ed;
    border-color: var(--dji-badge-orange);
    color: var(--dji-badge-orange);
}

/* ------------------------------------------------------------------
   9. FOOTER (DJI Charcoal & Soft Footer)
   ------------------------------------------------------------------ */
footer.bg-white,
footer.cbt-footer {
    background-color: var(--dji-footer) !important;
    border-top: 1px solid var(--dji-footer-divider) !important;
    color: var(--dji-footer-link) !important;
    padding: 32px 16px !important;
    font-size: 13px !important;
}

footer a {
    color: var(--dji-footer-link) !important;
}
/* ------------------------------------------------------------------
   10. DISPLAY & VISIBILITY UTILITIES (Critical for SPA Screen Switching)
   ------------------------------------------------------------------ */
.d-none,
.hidden {
    display: none !important;
}
.d-block {
    display: block !important;
}
.d-inline {
    display: inline !important;
}
.d-inline-block {
    display: inline-block !important;
}
.d-flex {
    display: flex !important;
}
.d-inline-flex {
    display: inline-flex !important;
}

@media (min-width: 768px) {
    .d-md-none { display: none !important; }
    .d-md-block { display: block !important; }
    .d-md-flex { display: flex !important; }
    .d-md-inline-flex { display: inline-flex !important; }
}
@media (min-width: 992px) {
    .d-lg-none { display: none !important; }
    .d-lg-block { display: block !important; }
    .d-lg-flex { display: flex !important; }
    .d-lg-inline-flex { display: inline-flex !important; }
}