/* ==========================================================================
   Crypto Blue Design System — FUO Exam & QuizPro Suite (Light + Dark Mode)
   ========================================================================== */

:root {
    /* MANDATORY: Automatically adapt native UI to user system preferences */
    color-scheme: light dark;

    &:has(> head > meta[name="color-scheme"][content="dark"]) {
        color-scheme: dark;
    }
    &:has(> head > meta[name="color-scheme"][content="light"]) {
        color-scheme: light;
    }

    /* Raw Light Palette (Crypto Blue Spec) */
    --cb-primary-light: #0052FF;
    --cb-primary-hover-light: #003ECB;
    --cb-primary-ring-light: rgba(0, 82, 255, 0.14);
    --cb-primary-tint-light: #F0F5FF;

    --cb-secondary-light: #5B616E;
    --cb-neutral-light: #8A919E;
    --cb-bg-light: #F9FAFB;
    --cb-surface-light: #FFFFFF;
    --cb-surface-subtle-light: #F3F4F6;
    --cb-text-primary-light: #050F1A;
    --cb-text-secondary-light: #5B616E;
    --cb-border-light: #D1D5DB;

    --cb-success-light: #05B169;
    --cb-success-bg-light: #E6F6EF;
    --cb-warning-light: #D97706;
    --cb-warning-bg-light: #FEF3C7;
    --cb-error-light: #DF2935;
    --cb-error-bg-light: #FDECEE;

    /* Raw Dark Palette (Crypto Blue Dark Spec) */
    --cb-primary-dark: #3B82F6;
    --cb-primary-hover-dark: #2563EB;
    --cb-primary-ring-dark: rgba(59, 130, 246, 0.25);
    --cb-primary-tint-dark: rgba(59, 130, 246, 0.14);

    --cb-secondary-dark: #94A3B8;
    --cb-neutral-dark: #64748B;
    --cb-bg-dark: #0A0E17;
    --cb-surface-dark: #111827;
    --cb-surface-subtle-dark: #1E293B;
    --cb-text-primary-dark: #F9FAFB;
    --cb-text-secondary-dark: #94A3B8;
    --cb-border-dark: #1E293B;

    --cb-success-dark: #10B981;
    --cb-success-bg-dark: rgba(16, 185, 129, 0.15);
    --cb-warning-dark: #F59E0B;
    --cb-warning-bg-dark: rgba(245, 158, 11, 0.16);
    --cb-error-dark: #EF4444;
    --cb-error-bg-dark: rgba(239, 68, 68, 0.16);

    /* Default (Light) fallback for browsers without light-dark() */
    --cb-primary: var(--cb-primary-light);
    --cb-primary-hover: var(--cb-primary-hover-light);
    --cb-primary-ring: var(--cb-primary-ring-light);
    --cb-primary-tint: var(--cb-primary-tint-light);
    --cb-secondary: var(--cb-secondary-light);
    --cb-neutral: var(--cb-neutral-light);
    --cb-bg: var(--cb-bg-light);
    --cb-surface: var(--cb-surface-light);
    --cb-surface-subtle: var(--cb-surface-subtle-light);
    --cb-text-primary: var(--cb-text-primary-light);
    --cb-text-secondary: var(--cb-text-secondary-light);
    --cb-border: var(--cb-border-light);
    --cb-success: var(--cb-success-light);
    --cb-success-bg: var(--cb-success-bg-light);
    --cb-warning: var(--cb-warning-light);
    --cb-warning-bg: var(--cb-warning-bg-light);
    --cb-error: var(--cb-error-light);
    --cb-error-bg: var(--cb-error-bg-light);

    /* MANDATORY: Fallback for browsers without light-dark() support */
    @media (prefers-color-scheme: dark) {
        &:not(:has(> head > meta[name="color-scheme"][content="light"])) {
            --cb-primary: var(--cb-primary-dark);
            --cb-primary-hover: var(--cb-primary-hover-dark);
            --cb-primary-ring: var(--cb-primary-ring-dark);
            --cb-primary-tint: var(--cb-primary-tint-dark);
            --cb-secondary: var(--cb-secondary-dark);
            --cb-neutral: var(--cb-neutral-dark);
            --cb-bg: var(--cb-bg-dark);
            --cb-surface: var(--cb-surface-dark);
            --cb-surface-subtle: var(--cb-surface-subtle-dark);
            --cb-text-primary: var(--cb-text-primary-dark);
            --cb-text-secondary: var(--cb-text-secondary-dark);
            --cb-border: var(--cb-border-dark);
            --cb-success: var(--cb-success-dark);
            --cb-success-bg: var(--cb-success-bg-dark);
            --cb-warning: var(--cb-warning-dark);
            --cb-warning-bg: var(--cb-warning-bg-dark);
            --cb-error: var(--cb-error-dark);
            --cb-error-bg: var(--cb-error-bg-dark);
        }
    }

    &:has(> head > meta[name="color-scheme"][content="dark"]) {
        --cb-primary: var(--cb-primary-dark);
        --cb-primary-hover: var(--cb-primary-hover-dark);
        --cb-primary-ring: var(--cb-primary-ring-dark);
        --cb-primary-tint: var(--cb-primary-tint-dark);
        --cb-secondary: var(--cb-secondary-dark);
        --cb-neutral: var(--cb-neutral-dark);
        --cb-bg: var(--cb-bg-dark);
        --cb-surface: var(--cb-surface-dark);
        --cb-surface-subtle: var(--cb-surface-subtle-dark);
        --cb-text-primary: var(--cb-text-primary-dark);
        --cb-text-secondary: var(--cb-text-secondary-dark);
        --cb-border: var(--cb-border-dark);
        --cb-success: var(--cb-success-dark);
        --cb-success-bg: var(--cb-success-bg-dark);
        --cb-warning: var(--cb-warning-dark);
        --cb-warning-bg: var(--cb-warning-bg-dark);
        --cb-error: var(--cb-error-dark);
        --cb-error-bg: var(--cb-error-bg-dark);
    }

    /* Use light-dark() where supported */
    @supports (color: light-dark(white, black)) {
        --cb-primary: light-dark(var(--cb-primary-light), var(--cb-primary-dark));
        --cb-primary-hover: light-dark(var(--cb-primary-hover-light), var(--cb-primary-hover-dark));
        --cb-primary-ring: light-dark(var(--cb-primary-ring-light), var(--cb-primary-ring-dark));
        --cb-primary-tint: light-dark(var(--cb-primary-tint-light), var(--cb-primary-tint-dark));
        --cb-secondary: light-dark(var(--cb-secondary-light), var(--cb-secondary-dark));
        --cb-neutral: light-dark(var(--cb-neutral-light), var(--cb-neutral-dark));
        --cb-bg: light-dark(var(--cb-bg-light), var(--cb-bg-dark));
        --cb-surface: light-dark(var(--cb-surface-light), var(--cb-surface-dark));
        --cb-surface-subtle: light-dark(var(--cb-surface-subtle-light), var(--cb-surface-subtle-dark));
        --cb-text-primary: light-dark(var(--cb-text-primary-light), var(--cb-text-primary-dark));
        --cb-text-secondary: light-dark(var(--cb-text-secondary-light), var(--cb-text-secondary-dark));
        --cb-border: light-dark(var(--cb-border-light), var(--cb-border-dark));
        --cb-success: light-dark(var(--cb-success-light), var(--cb-success-dark));
        --cb-success-bg: light-dark(var(--cb-success-bg-light), var(--cb-success-bg-dark));
        --cb-warning: light-dark(var(--cb-warning-light), var(--cb-warning-dark));
        --cb-warning-bg: light-dark(var(--cb-warning-bg-light), var(--cb-warning-bg-dark));
        --cb-error: light-dark(var(--cb-error-light), var(--cb-error-dark));
        --cb-error-bg: light-dark(var(--cb-error-bg-light), var(--cb-error-bg-dark));
    }

    /* Semantic aliases */
    --cb-positive: var(--cb-success);
    --cb-negative: var(--cb-error);

    /* Brand-consistent form controls */
    accent-color: var(--cb-primary);

    /* Elevation Levels */
    --shadow-level-1: 0 1px 3px rgba(5, 15, 26, 0.08);
    --shadow-level-2: 0 4px 12px rgba(5, 15, 26, 0.12);
    --shadow-level-3: 0 12px 24px rgba(5, 15, 26, 0.18);

    /* Motion Tokens */
    --ease-out-expo: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Border Radius */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 9999px;

    /* Typography */
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* Non-color branching for Theme Toggle button icons */
.theme-opt-light {
    display: none;
}
.theme-opt-dark {
    display: inline-flex;
}

@media (prefers-color-scheme: dark) {
    :root:not(:has(> head > meta[name="color-scheme"][content="light"])) .theme-opt-dark {
        display: none;
    }
    :root:not(:has(> head > meta[name="color-scheme"][content="light"])) .theme-opt-light {
        display: inline-flex;
    }
}

:root:has(> head > meta[name="color-scheme"][content="dark"]) .theme-opt-dark {
    display: none;
}
:root:has(> head > meta[name="color-scheme"][content="dark"]) .theme-opt-light {
    display: inline-flex;
}

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

body {
    font-family: var(--font-sans);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--cb-text-primary);
    background-color: var(--cb-bg);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    accent-color: var(--cb-primary);
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Typography Scale & Utilities (Fluid Scaling with clamp) */
.h1-title {
    font-size: clamp(1.35rem, 1.1rem + 1.1vw, 1.75rem);
    font-weight: 700;
    line-height: 1.22;
    letter-spacing: -0.02em;
    color: var(--cb-text-primary);
}

.h2-title {
    font-size: clamp(1.15rem, 1.02rem + 0.65vw, 1.375rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--cb-text-primary);
}

.h3-title {
    font-size: clamp(1rem, 0.94rem + 0.35vw, 1.125rem);
    font-weight: 700;
    line-height: 1.28;
    letter-spacing: -0.02em;
    color: var(--cb-text-primary);
}

.body-sm {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
}

.caption-label {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--cb-neutral);
}

.mono-data {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.mono-sm {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 400;
    font-variant-numeric: tabular-nums;
}

.text-secondary {
    color: var(--cb-text-secondary);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

/* ==========================================================================
   Top Navigation Bar (60px Height)
   ========================================================================== */
.topbar {
    height: 60px;
    background-color: var(--cb-surface);
    border-bottom: 1px solid var(--cb-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar-inner {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background: var(--cb-surface);
    color: var(--cb-text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--cb-text-primary);
}

.logo-mark {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background-color: var(--cb-primary);
    color: #FFFFFF;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
}

.logo-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.server-chip {
    gap: 6px;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: var(--radius-pill);
    background-color: var(--cb-success);
    box-shadow: 0 0 0 0 rgba(5, 177, 105, 0.5);
    animation: cb-pulse-dot 2.4s infinite ease-out;
    @media (prefers-reduced-motion: reduce) {
        animation: none;
    }
}

.status-dot.offline-dot {
    background-color: var(--cb-warning);
    animation: none;
}

@keyframes cb-pulse-dot {
    0% { box-shadow: 0 0 0 0 rgba(5, 177, 105, 0.45); }
    70% { box-shadow: 0 0 0 6px rgba(5, 177, 105, 0); }
    100% { box-shadow: 0 0 0 0 rgba(5, 177, 105, 0); }
}

/* Center Horizontal Nav */
.topbar-nav {
    display: flex;
    align-items: center;
    height: 100%;
    gap: 2px;
}

.nav-link {
    height: 100%;
    padding: 0 14px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 14px;
    font-weight: 500;
    color: var(--cb-text-secondary);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--cb-text-primary);
}

.nav-link.active {
    color: var(--cb-primary);
    border-bottom-color: var(--cb-primary);
    font-weight: 700;
}

.nav-port {
    padding: 2px 6px;
    background: var(--cb-surface-subtle);
    border-radius: var(--radius-xs);
    color: var(--cb-secondary);
    font-size: 12px;
}

.nav-hot-badge {
    height: 22px;
    font-size: 11px;
    padding: 0 7px;
}

/* Right Search, Theme Toggle & CTA */
.topbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-box {
    position: relative;
    width: 240px;
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--cb-neutral);
    font-size: 14px;
    pointer-events: none;
}

.search-box input {
    width: 100%;
    height: 40px;
    padding: 8px 12px 8px 36px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    background-color: var(--cb-surface-subtle);
    color: var(--cb-text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    outline: none;
    transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-box input::placeholder {
    color: var(--cb-neutral);
}

.search-box input:focus {
    background-color: var(--cb-surface);
    border: 2px solid var(--cb-primary);
    box-shadow: 0 0 0 4px var(--cb-primary-ring);
}

.btn-icon-only {
    min-width: 40px !important;
    width: 40px;
    height: 40px !important;
    padding: 0 !important;
}

/* ==========================================================================
   Main Container & Sections (1200px Max Width, 24px Padding)
   ========================================================================== */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: cb-section-enter 0.26s var(--ease-out-expo) both;
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 0.08s;
    }
}

.quiz-subview:not(.hidden) {
    animation: cb-section-enter 0.24s var(--ease-out-expo) both;
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 0.08s;
    }
}

@keyframes cb-section-enter {
    from {
        opacity: 0;
        translate: 0 8px;
    }
    to {
        opacity: 1;
        translate: 0 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    @keyframes cb-section-enter {
        from { opacity: 0; translate: none; }
        to { opacity: 1; translate: none; }
    }
}

.section-intro {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.section-intro p {
    margin-top: 4px;
}

.intro-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* ==========================================================================
   Core Components: Cards, Buttons, Inputs, Chips
   ========================================================================== */
.card {
    background-color: var(--cb-surface);
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-level-1);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.btn {
    height: 44px;
    min-width: 100px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease, transform 0.1s ease;
    white-space: nowrap;
    text-decoration: none;
}

.btn:active:not(:disabled) {
    transform: translateY(1px);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--cb-primary-hover);
}

.btn-secondary {
    background-color: var(--cb-surface);
    color: var(--cb-text-primary);
    border-color: var(--cb-border);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--cb-primary);
    color: var(--cb-primary);
}

.btn-ghost {
    background-color: transparent;
    color: var(--cb-primary);
    min-width: auto;
    padding: 8px 12px;
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--cb-primary-tint);
}

.btn-sm {
    height: 36px;
    min-width: auto;
    padding: 6px 12px;
    font-size: 13px;
}

.full-w {
    width: 100%;
}

.input-field {
    height: 44px;
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-surface);
    color: var(--cb-text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input-field::placeholder {
    color: var(--cb-neutral);
}

.input-field:focus {
    border: 2px solid var(--cb-primary);
    box-shadow: 0 0 0 4px var(--cb-primary-ring);
}

.textarea-field {
    height: auto;
    min-height: 84px;
    resize: vertical;
    line-height: 1.5;
}

.input-compact {
    width: auto;
    min-width: 170px;
}

.chip {
    height: 28px;
    padding: 0 10px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.chip-positive {
    background-color: var(--cb-success-bg);
    color: var(--cb-success);
}

.chip-warning {
    background-color: var(--cb-warning-bg);
    color: var(--cb-warning);
}

.chip-negative {
    background-color: var(--cb-error-bg);
    color: var(--cb-error);
}

.chip-neutral {
    background-color: var(--cb-surface-subtle);
    color: var(--cb-secondary);
}

/* ==========================================================================
   Stats Row & Subject Hub Explorer
   ========================================================================== */
.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 16px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, translate 0.2s var(--ease-out-expo);
}

.stat-card-clickable {
    cursor: pointer;
}

.stat-card:hover {
    border-color: var(--cb-primary);
}

.stat-card-clickable:hover {
    translate: 0 -2px;
    box-shadow: var(--shadow-level-2);
    @media (prefers-reduced-motion: reduce) {
        translate: none;
    }
}

.stat-card-clickable:active {
    translate: 0 0;
}

.stat-head {
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-pill);
    background-color: var(--cb-surface-subtle);
    color: var(--cb-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.stat-icon.success-icon, .ac-icon.success-icon {
    background-color: var(--cb-success-bg);
    color: var(--cb-success);
}

.stat-icon.primary-icon, .ac-icon.primary-icon {
    background-color: var(--cb-primary-tint);
    color: var(--cb-primary);
}

.stat-icon.warning-icon, .ac-icon.warning-icon {
    background-color: var(--cb-warning-bg);
    color: var(--cb-warning);
}

.stat-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--cb-text-secondary);
}

.stat-bottom {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--cb-text-primary);
}

/* Subject Explorer Hub Card */
.subject-hub-card {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.subject-hub-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.subject-selector-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

.subject-pools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
    gap: 14px;
}

.pool-card {
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-md);
    background-color: var(--cb-bg);
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 14px;
    transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, translate 0.2s var(--ease-out-expo);
    animation: cb-card-enter 0.3s var(--ease-out-expo) both;
    animation-delay: calc(min(var(--card-idx, 0), 8) * 30ms);
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 0.08s;
        animation-delay: 0ms;
    }
}

.pool-card:hover {
    border-color: var(--cb-primary);
    translate: 0 -2px;
    box-shadow: var(--shadow-level-2);
    @media (prefers-reduced-motion: reduce) {
        translate: none;
    }
}

.pool-card.active {
    border: 2px solid var(--cb-primary);
    background-color: var(--cb-primary-tint);
}

.pool-card.pool-frequent {
    border-color: rgba(245, 158, 11, 0.4);
    background: linear-gradient(180deg, rgba(245, 158, 11, 0.05) 0%, var(--cb-bg) 100%);
}

.pool-card.pool-frequent:hover {
    border-color: var(--cb-warning);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.15);
}

.pool-card.pool-frequent.active {
    border: 2px solid var(--cb-warning);
    background-color: var(--cb-warning-bg);
}

.pool-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.pool-card-meta {
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    color: var(--cb-text-secondary);
    letter-spacing: normal;
    white-space: nowrap;
}

.pool-card-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--cb-text-primary);
    margin-top: 6px;
}

.pool-card-desc {
    font-size: 13px;
    color: var(--cb-text-secondary);
    margin-top: 2px;
    line-height: 1.45;
}

.pool-card-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
}

.pool-card-actions .btn {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    text-overflow: ellipsis;
}
    flex: 1;
}

/* Action Panels */
.action-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 16px;
    margin-bottom: 40px;
}

.action-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 20px;
}

.action-card:hover {
    border-color: var(--cb-primary);
}

.ac-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.ac-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.ac-title-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    flex: 1 1 320px;
    min-width: 0;
}

.ac-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-pill);
    background-color: var(--cb-surface-subtle);
    color: var(--cb-text-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    flex-shrink: 0;
}

.crawl-inputs {
    display: grid;
    grid-template-columns: 1.4fr 1.1fr auto;
    gap: 12px;
}

.token-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.token-input-wrap .input-field {
    padding-right: 98px;
}

.token-help-inline {
    position: absolute;
    right: 6px;
    height: 32px;
    padding: 0 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    color: var(--cb-primary);
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.token-help-inline:hover {
    border-color: var(--cb-primary);
    background-color: var(--cb-primary-tint);
}

.token-field {
    font-family: var(--font-mono);
    font-size: 13px;
}

.stack-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.zip-hint {
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    background-color: var(--cb-bg);
    border: 1px dashed var(--cb-border);
    border-radius: var(--radius-md);
}

/* ==========================================================================
   Question Cards Grid & Preview Section
   ========================================================================== */
.section-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.section-bar-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.q-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr));
    gap: 16px;
}

.q-card {
    background-color: var(--cb-surface);
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-level-1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 16px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, translate 0.2s var(--ease-out-expo);
    animation: cb-card-enter 0.28s var(--ease-out-expo) both;
    animation-delay: calc(min(var(--card-idx, 0), 10) * 24ms);
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 0.08s;
        animation-delay: 0ms;
    }
}

.q-card:hover {
    border-color: var(--cb-primary);
    translate: 0 -2px;
    box-shadow: var(--shadow-level-2);
    @media (prefers-reduced-motion: reduce) {
        translate: none;
    }
}

@keyframes cb-card-enter {
    from {
        opacity: 0;
        translate: 0 10px;
    }
    to {
        opacity: 1;
        translate: 0 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    @keyframes cb-card-enter {
        from { opacity: 0; translate: none; }
        to { opacity: 1; translate: none; }
    }
}

.qc-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
}

.qc-head-badges {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.qc-id-badge {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    color: var(--cb-text-primary);
    background-color: var(--cb-surface-subtle);
    padding: 4px 10px;
    border-radius: var(--radius-xs);
}

.qc-star-btn {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--cb-border);
    background: var(--cb-surface);
    color: var(--cb-neutral);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease, scale 0.2s var(--ease-spring);
}

.qc-star-btn:hover {
    border-color: var(--cb-warning);
    color: var(--cb-warning);
}

.qc-star-btn.starred {
    color: var(--cb-warning);
    border-color: var(--cb-warning);
    background-color: var(--cb-warning-bg);
    animation: cb-star-pop 0.32s var(--ease-spring);
    @media (prefers-reduced-motion: reduce) {
        animation: none;
    }
}

@keyframes cb-star-pop {
    0% { scale: 1; }
    45% { scale: 1.24; }
    100% { scale: 1; }
}

.qc-text {
    font-size: 16px;
    font-weight: 700;
    line-height: 1.45;
    color: var(--cb-text-primary);
    margin: 12px 0 14px;
}

.qc-text.unsolved-text {
    color: var(--cb-neutral);
    font-weight: 500;
    font-style: italic;
}

.qc-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.opt-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    font-size: 14px;
    color: var(--cb-text-secondary);
}

.opt-row.correct {
    background-color: var(--cb-success-bg);
    border-color: var(--cb-success);
    color: var(--cb-text-primary);
    font-weight: 500;
}

.opt-badge {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    width: 24px;
    height: 24px;
    border-radius: var(--radius-xs);
    background-color: var(--cb-surface);
    border: 1px solid var(--cb-border);
    color: var(--cb-text-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.opt-row.correct .opt-badge {
    background-color: var(--cb-success);
    border-color: var(--cb-success);
    color: #FFFFFF;
}

.qc-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 14px;
    border-top: 1px solid var(--cb-border);
    gap: 8px;
    flex-wrap: wrap;
}

.qc-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.qc-explanation {
    margin-top: 14px;
    padding: 12px 14px;
    background-color: var(--cb-surface-subtle);
    border: 1px solid var(--cb-border);
    border-left: 3px solid var(--cb-primary);
    border-radius: var(--radius-md);
    font-size: 13px;
    line-height: 1.55;
}

.qc-exp-title {
    font-weight: 700;
    font-size: 12px;
    color: var(--cb-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.qc-exp-content {
    color: var(--cb-text-secondary);
}

.qp-player-exp {
    margin-top: 14px;
    padding: 14px;
    background-color: var(--cb-surface-subtle);
    border: 1px solid var(--cb-border);
    border-left: 4px solid var(--cb-primary);
    border-radius: var(--radius-md);
    font-size: 14px;
    line-height: 1.6;
    color: var(--cb-text-secondary);
    animation: cb-card-enter 0.2s ease both;
}

.qp-player-exp-title {
    font-weight: 700;
    font-size: 12px;
    color: var(--cb-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ==========================================================================
   Questions Toolbar & Segmented Controls
   ========================================================================== */
.q-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.q-toolbar-left, .q-toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.suite-indicator {
    display: flex;
    flex-direction: column;
    padding-right: 12px;
    border-right: 1px solid var(--cb-border);
}

.suite-badge {
    color: var(--cb-text-primary);
}

.chips-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.view-segmented {
    display: inline-flex;
    background-color: var(--cb-surface-subtle);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
}

.seg-btn {
    height: 34px;
    padding: 0 12px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--cb-text-secondary);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.seg-btn.active {
    background-color: var(--cb-surface);
    color: var(--cb-primary);
    box-shadow: var(--shadow-level-1);
}

/* ==========================================================================
   SECTION 3: QUIZPRO STUDIO (Builder + Minimal Player + Round Checkpoint)
   ========================================================================== */

.quiz-breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.qp-resume-banner {
    margin-bottom: 20px;
    border-color: var(--cb-primary);
    background-color: var(--cb-primary-tint);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.qp-resume-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.qp-resume-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.qp-mastery-card {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qp-mastery-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.qp-mastery-chips {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.dot-not-studied, .dot-learning, .dot-mastered {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-pill);
    display: inline-block;
}
.dot-not-studied { background-color: var(--cb-neutral); }
.dot-learning { background-color: var(--cb-warning); }
.dot-mastered { background-color: var(--cb-success); }

.qp-mastery-bar-track {
    width: 100%;
    height: 12px;
    border-radius: var(--radius-pill);
    background-color: var(--cb-surface-subtle);
    overflow: hidden;
    display: flex;
}

.qp-mastery-seg {
    height: 100%;
    transition: width 0.35s ease;
}
.qp-mastery-seg.mastered { background-color: var(--cb-success); }
.qp-mastery-seg.learning { background-color: var(--cb-warning); }

.qp-builder-grid {
    display: grid;
    grid-template-columns: 1.75fr 1fr;
    gap: 20px;
    align-items: start;
}

.qp-builder-main, .qp-builder-side {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.qp-config-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qp-step-header {
    display: flex;
    align-items: center;
    gap: 10px;
}

.qp-step-num {
    padding: 3px 8px;
    border-radius: var(--radius-xs);
    background-color: var(--cb-primary-tint);
    color: var(--cb-primary);
    font-weight: 700;
}

.qp-source-pills {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr));
    gap: 10px;
}

.qp-source-btn {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    color: var(--cb-text-primary);
    font-family: var(--font-sans);
    text-align: left;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: border-color 0.18s ease, background-color 0.18s ease, translate 0.18s var(--ease-out-expo), box-shadow 0.18s ease;
}

.qp-source-btn:hover {
    border-color: var(--cb-primary);
    translate: 0 -1px;
    box-shadow: var(--shadow-level-1);
    @media (prefers-reduced-motion: reduce) {
        translate: none;
    }
}
.qp-source-btn.active {
    border: 2px solid var(--cb-primary);
    background-color: var(--cb-primary-tint);
}

.qp-source-btn-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    font-size: 14px;
    font-weight: 700;
}

.qp-source-btn-sub {
    font-size: 12px;
    color: var(--cb-text-secondary);
}

.qp-modes-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.qp-mode-card {
    padding: 18px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    color: var(--cb-text-primary);
    font-family: var(--font-sans);
    text-align: left;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.18s ease, background-color 0.18s ease, translate 0.18s var(--ease-out-expo), box-shadow 0.18s ease;
}

.qp-mode-card:hover {
    border-color: var(--cb-primary);
    translate: 0 -2px;
    box-shadow: var(--shadow-level-2);
    @media (prefers-reduced-motion: reduce) {
        translate: none;
    }
}
.qp-mode-card.active {
    border: 2px solid var(--cb-primary);
    background-color: var(--cb-primary-tint);
}

.qp-mode-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.qp-mode-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background-color: var(--cb-surface);
    border: 1px solid var(--cb-border);
    color: var(--cb-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
}

.qp-settings-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.qp-settings-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.qp-check-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: var(--cb-text-primary);
    cursor: pointer;
    user-select: none;
    line-height: 1.4;
}

.qp-check-row input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-top: 1px;
    flex-shrink: 0;
    cursor: pointer;
}

.qp-launch-box {
    padding-top: 14px;
    border-top: 1px solid var(--cb-border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.qp-launch-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.qp-start-btn {
    height: 48px;
    font-size: 16px;
}

/* Minimal Player Container */
.mq-container {
    max-width: 780px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.qp-player-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 12px 18px;
    flex-wrap: wrap;
}

.qp-player-left, .qp-player-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.qp-player-center {
    flex: 1;
    max-width: 340px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.qp-progress-track {
    flex: 1;
    height: 8px;
    border-radius: var(--radius-pill);
    background-color: var(--cb-surface-subtle);
    overflow: hidden;
}

.qp-progress-fill {
    height: 100%;
    background-color: var(--cb-primary);
    border-radius: var(--radius-pill);
    transition: width 0.25s ease;
}

.mq-stat-correct { color: var(--cb-success); }
.mq-stat-wrong { color: var(--cb-error); }
.mq-stat-streak {
    color: var(--cb-warning);
    display: inline-block;
    transition: scale 0.2s var(--ease-spring);
}
.mq-stat-streak.streak-pulse {
    animation: cb-streak-pulse 0.36s var(--ease-spring);
    @media (prefers-reduced-motion: reduce) {
        animation: none;
    }
}

@keyframes cb-streak-pulse {
    0% { scale: 1; }
    50% { scale: 1.25; }
    100% { scale: 1; }
}

/* Minimal Question Card */
.mq-card {
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mq-card.mq-stage-enter {
    animation: cb-question-slide 0.22s var(--ease-out-expo) both;
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 0.08s;
    }
}

@keyframes cb-question-slide {
    from {
        opacity: 0;
        translate: 0 6px;
    }
    to {
        opacity: 1;
        translate: 0 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    @keyframes cb-question-slide {
        from { opacity: 0; translate: none; }
        to { opacity: 1; translate: none; }
    }
}

.mq-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.mq-card-head-left,
.mq-card-head-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.mq-question-stem {
    font-size: clamp(1.0625rem, 0.98rem + 0.45vw, 1.25rem);
    font-weight: 700;
    line-height: 1.45;
    color: var(--cb-text-primary);
    letter-spacing: -0.01em;
}

/* Options List (No key illustration badges) */
.mq-options-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mq-option-btn {
    width: 100%;
    padding: 15px 18px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    color: var(--cb-text-primary);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.45;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    transition: border-color 0.15s ease, background-color 0.15s ease, translate 0.15s var(--ease-out-expo), box-shadow 0.15s ease;
}

.mq-option-btn:hover {
    border-color: var(--cb-primary);
    translate: 2px 0;
    @media (prefers-reduced-motion: reduce) {
        translate: none;
    }
}

.mq-option-btn.selected {
    border: 2px solid var(--cb-primary);
    background-color: var(--cb-primary-tint);
    padding: 14px 17px;
    font-weight: 500;
    box-shadow: 0 0 0 3px var(--cb-primary-ring);
}

.mq-option-btn.correct {
    border: 2px solid var(--cb-success);
    background-color: var(--cb-success-bg);
    padding: 14px 17px;
    font-weight: 700;
    animation: cb-correct-pop 0.28s var(--ease-spring);
    @media (prefers-reduced-motion: reduce) {
        animation: none;
    }
}

.mq-option-btn.wrong {
    border: 2px solid var(--cb-error);
    background-color: var(--cb-error-bg);
    padding: 14px 17px;
    animation: cb-wrong-shake 0.34s ease-in-out;
    @media (prefers-reduced-motion: reduce) {
        animation: none;
    }
}

@keyframes cb-correct-pop {
    0% { scale: 0.985; }
    50% { scale: 1.012; }
    100% { scale: 1; }
}

@keyframes cb-wrong-shake {
    0%, 100% { translate: 0 0; }
    20% { translate: -5px 0; }
    45% { translate: 5px 0; }
    70% { translate: -3px 0; }
    85% { translate: 2px 0; }
}

.mq-option-left {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.mq-opt-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.mq-option-btn.correct .mq-opt-tag { color: var(--cb-success); }
.mq-option-btn.wrong .mq-opt-tag { color: var(--cb-error); }

/* Flashcard 3D Stage (Grid cell stacking so card auto-grows to tallest face without clipping) */
.qp-flashcard-stage {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.qp-fc-Scene {
    perspective: 1200px;
    min-height: 320px;
    cursor: pointer;
    outline: none;
}

.qp-fc-inner {
    position: relative;
    width: 100%;
    min-height: 320px;
    display: grid;
    grid-template-columns: 1fr;
    transform-style: preserve-3d;
    transition: transform 0.48s var(--ease-out-expo);
    @media (prefers-reduced-motion: reduce) {
        transition-duration: 0.15s;
    }
}

.qp-fc-inner.is-flipped { transform: rotateY(180deg); }

.qp-fc-face {
    grid-area: 1 / 1;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-lg);
    background-color: var(--cb-bg);
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 16px;
}

.qp-fc-back {
    transform: rotateY(180deg);
    border-color: var(--cb-success);
    background-color: var(--cb-surface);
}

.qp-fc-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.qp-fc-question {
    font-size: 20px;
    font-weight: 700;
    color: var(--cb-text-primary);
}

.qp-fc-opts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    font-size: 14px;
    color: var(--cb-text-secondary);
}

.qp-fc-answer {
    font-size: 22px;
    font-weight: 700;
    color: var(--cb-success);
}

.qp-fc-question-sub {
    font-size: 15px;
    color: var(--cb-text-secondary);
}

.qp-fc-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* Round Checkpoint Card */
.qp-round-checkpoint {
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.qp-cp-head {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.qp-cp-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    background-color: var(--cb-success-bg);
    color: var(--cb-success);
    font-weight: 700;
    font-size: 14px;
}

.qp-cp-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: 100%;
}

.qp-cp-stat {
    padding: 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.qp-cp-review-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
    padding-right: 4px;
}

.qp-cp-review-item {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    font-size: 14px;
}

.qp-cp-review-item.was-wrong {
    border-color: var(--cb-warning);
    background-color: var(--cb-warning-bg);
}

.qp-cp-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* Minimal Results Card */
.mq-results-card {
    padding: 36px 28px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.mq-res-icon {
    font-size: 44px;
    color: var(--cb-success);
}

.mq-res-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: 100%;
    max-width: 520px;
    margin: 8px 0;
}

.mq-res-stat-box {
    padding: 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mq-res-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.qp-missed-analysis-card {
    margin-top: 8px;
}

/* ==========================================================================
   Data Table (Crypto Blue Flat 1px Border + Responsive Container Query)
   ========================================================================== */
.table-wrapper {
    overflow: auto;
    max-inline-size: 100%;
    max-block-size: min(720px, 82vh);
    container-type: inline-size;
    background-color: var(--cb-surface);
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-md);
}

.q-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 14px;
}

.q-table thead {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background-color: var(--cb-bg);
}

.q-table th {
    padding: 14px 16px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--cb-neutral);
    text-align: left;
    border-bottom: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
}

.q-table tbody th {
    position: sticky;
    inset-inline-start: 0;
    z-index: 1;
    background-color: var(--cb-surface);
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--cb-text-primary);
    text-transform: none;
    letter-spacing: 0;
}

.q-table td {
    padding: 16px;
    border-bottom: 1px solid var(--cb-border);
    vertical-align: top;
    color: var(--cb-text-primary);
}

.q-table tbody tr {
    min-height: 64px;
}

.q-table tbody tr:hover td,
.q-table tbody tr:hover th {
    background-color: var(--cb-bg);
}

.q-table tbody tr:last-child td,
.q-table tbody tr:last-child th {
    border-bottom: none;
}

.table-opts-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 13px;
    color: var(--cb-text-secondary);
}

.table-opt-correct {
    color: var(--cb-success);
    font-weight: 700;
}

@container (width < 680px) {
    .q-table, .q-table thead, .q-table tbody, .q-table tr, .q-table th, .q-table td {
        display: block;
    }

    .q-table thead {
        display: none;
    }

    .q-table tr {
        margin-block-end: 16px;
        border: 1px solid var(--cb-border);
        border-radius: var(--radius-md);
    }

    .q-table tbody th {
        position: sticky;
        inset-block-start: 0;
        z-index: 2;
        background-color: var(--cb-bg);
        border-bottom: 1px solid var(--cb-border);
    }

    .q-table {
        --label-2: "Câu hỏi";
        --label-3: "Phương án";
        --label-4: "Đáp án";
        --label-5: "Thao tác";
    }

    .q-table td:nth-child(2)::before {
        content: var(--label-2) ": ";
        font-weight: 700;
        color: var(--cb-secondary);
    }
    .q-table td:nth-child(3)::before {
        content: var(--label-3) ": ";
        font-weight: 700;
        color: var(--cb-secondary);
    }
    .q-table td:nth-child(4)::before {
        content: var(--label-4) ": ";
        font-weight: 700;
        color: var(--cb-secondary);
    }
    .q-table td:nth-child(5)::before {
        content: var(--label-5) ": ";
        font-weight: 700;
        color: var(--cb-secondary);
    }
}

/* ==========================================================================
   Native Modal Dialogs (<dialog> + Top Layer + Scroll Containment + Animations)
   ========================================================================== */
dialog:modal {
    overscroll-behavior: contain;
}

.crypto-dialog {
    margin: auto;
    padding: 0;
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-xl);
    background-color: var(--cb-surface);
    color: var(--cb-text-primary);
    box-shadow: var(--shadow-level-3);
    width: min(92vw, 680px);
    max-height: 90vh;
    max-height: 90dvh;

    opacity: 0;
    transform: scale(0.95) translateY(8px);
    transition-property: opacity, transform, display, overlay;
    transition-duration: 0.24s;
    transition-timing-function: var(--ease-out-expo);
    transition-behavior: allow-discrete;
}

.crypto-dialog::backdrop {
    overflow: hidden;
    overscroll-behavior: contain;
    background-color: rgba(5, 15, 26, 0);
    backdrop-filter: blur(0px);
    transition-property: background-color, backdrop-filter, display, overlay;
    transition-duration: 0.24s;
    transition-timing-function: ease-out;
    transition-behavior: allow-discrete;
}

.crypto-dialog[open] {
    display: flex;
    flex-direction: column;
}

:is(.crypto-dialog[open]):where(:not([data-closing])) {
    opacity: 1;
    transform: scale(1) translateY(0);

    @starting-style {
        opacity: 0;
        transform: scale(0.95) translateY(8px);
    }

    &::backdrop {
        background-color: rgba(5, 15, 26, 0.55);
        backdrop-filter: blur(2px);

        @starting-style {
            background-color: rgba(5, 15, 26, 0);
            backdrop-filter: blur(0px);
        }
    }
}

@media (prefers-reduced-motion: reduce) {
    .crypto-dialog {
        transform: none;
        transition-duration: 0.1s;
    }

    @starting-style {
        :is(.crypto-dialog[open]):where(:not([data-closing])) {
            transform: none;
        }
    }
}

.lightbox-dialog {
    width: min(94vw, 960px);
}

.dialog-panel {
    display: flex;
    flex-direction: column;
    max-height: 90vh;
    max-height: 90dvh;
    width: 100%;
}

.dialog-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--cb-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.dialog-title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
}

.dialog-close-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-surface);
    color: var(--cb-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.dialog-close-btn:hover {
    border-color: var(--cb-primary);
    color: var(--cb-primary);
}

.dialog-body {
    padding: 20px 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-img-preview-box {
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-md);
    background-color: var(--cb-bg);
    overflow: hidden;
}

.modal-img-bar {
    padding: 8px 12px;
    border-bottom: 1px solid var(--cb-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--cb-surface);
}

.modal-img-Canvas {
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    max-height: 220px;
    overflow: auto;
}

.modal-img-Canvas img {
    max-width: 100%;
    max-height: 196px;
    object-fit: contain;
    border-radius: var(--radius-xs);
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-field label {
    font-size: 13px;
    font-weight: 500;
    color: var(--cb-text-secondary);
}

.opts-grid-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.dialog-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--cb-border);
    background-color: var(--cb-bg);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

.lightbox-body {
    padding: 24px;
    background-color: var(--cb-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
    max-height: 78vh;
}

.lightbox-body img {
    max-width: 100%;
    max-height: 72vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-surface);
}

/* Token Guide Dialog Styles */
.guide-method-card {
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-md);
    background-color: var(--cb-bg);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.guide-method-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
}

.guide-steps {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
    color: var(--cb-text-primary);
}

.guide-link {
    color: var(--cb-primary);
    font-weight: 700;
    text-decoration: none;
}

.guide-link:hover {
    text-decoration: underline;
}

.kbd-tag {
    display: inline-block;
    padding: 1px 6px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--cb-border);
    background-color: var(--cb-surface);
    color: var(--cb-text-primary);
    font-size: 12px;
}

.code-snippet-box {
    background-color: #050F1A;
    color: #E6F6EF;
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.code-snippet-box code {
    display: block;
    word-break: break-all;
    line-height: 1.45;
    font-size: 12px;
    user-select: all;
}

.code-snippet-box .btn {
    align-self: flex-end;
}

.token-save-row {
    display: flex;
    gap: 10px;
}

/* ==========================================================================
   Loading Overlay & Toast Banner
   ========================================================================== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(5, 15, 26, 0.55);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 500;
}

.loading-card {
    width: min(90vw, 380px);
    text-align: center;
    padding: 32px 24px;
    box-shadow: var(--shadow-level-3);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.loading-progress-wrap {
    width: 100%;
    margin-top: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.loading-progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--cb-surface-subtle);
    border-radius: var(--radius-pill);
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.12);
}

.loading-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--cb-brand), var(--cb-brand-hover));
    border-radius: var(--radius-pill);
    transition: width 0.35s ease;
}

.loading-progress-text {
    font-size: 12px;
    font-weight: 700;
    color: var(--cb-brand);
    font-family: var(--font-mono);
}

.spinner-ring {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-pill);
    border: 3px solid var(--cb-surface-subtle);
    border-top-color: var(--cb-primary);
    animation: cb-spin 0.8s linear infinite;
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 2.5s;
    }
}

@keyframes cb-spin {
    to { transform: rotate(360deg); }
}

.toast-banner {
    position: fixed;
    right: 24px;
    bottom: 24px;
    max-width: calc(100vw - 32px);
    background-color: #050F1A;
    color: #FFFFFF;
    border: 1px solid var(--cb-border);
    padding: 12px 18px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-level-2);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 600;
    animation: cb-toast-in 0.24s var(--ease-out-expo) both;
    @media (prefers-reduced-motion: reduce) {
        animation-duration: 0.08s;
    }
}

@keyframes cb-toast-in {
    from {
        opacity: 0;
        translate: 0 12px;
    }
    to {
        opacity: 1;
        translate: 0 0;
    }
}

.toast-icon {
    color: var(--cb-success);
    font-size: 16px;
    flex-shrink: 0;
}

/* ==========================================================================
   Responsive Breakpoints (Desktop -> Tablet -> Mobile -> Small Mobile)
   ========================================================================== */
@media (max-width: 1120px) {
    .nav-hot-badge,
    .nav-port {
        display: none;
    }

    .nav-link {
        padding: 0 10px;
        font-size: 13.5px;
    }

    .search-box {
        width: 190px;
    }
}

@media (max-width: 980px) {
    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }

    .action-grid,
    .qp-builder-grid,
    .qp-arena-layout {
        grid-template-columns: 1fr;
    }

    .crawl-inputs {
        grid-template-columns: 1fr;
    }

    .qp-results-hero {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .qp-results-info {
        align-items: center;
    }

    .qp-res-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .menu-toggle {
        display: inline-flex;
    }

    .topbar-nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        height: auto;
        background-color: var(--cb-surface);
        border-bottom: 1px solid var(--cb-border);
        box-shadow: var(--shadow-level-2);
        flex-direction: column;
        align-items: stretch;
        padding: 8px 16px;
        z-index: 120;
    }

    .topbar-nav.mobile-open {
        display: flex;
        animation: cb-section-enter 0.2s var(--ease-out-expo) both;
    }

    .nav-link {
        height: 44px;
        padding: 0 14px;
        font-size: 14px;
        border-bottom: none;
        border-radius: var(--radius-md);
    }

    .nav-link .nav-hot-badge,
    .nav-link .nav-port {
        display: inline-flex;
        margin-left: auto;
    }

    .nav-link.active {
        background-color: var(--cb-primary-tint);
    }
}

@media (max-width: 768px) {
    .main-container {
        padding: 20px 16px 48px;
    }

    .topbar-inner {
        padding: 0 16px;
        gap: 8px;
    }

    .search-box {
        width: 165px;
    }

    .opts-grid-2col,
    .qp-modes-grid,
    .qp-cp-stats,
    .qp-fc-opts {
        grid-template-columns: 1fr;
    }

    .q-toolbar {
        padding: 16px;
        gap: 12px;
    }

    .q-toolbar-left,
    .q-toolbar-right {
        width: 100%;
    }

    .suite-indicator {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--cb-border);
        padding-right: 0;
        padding-bottom: 10px;
    }

    .qp-player-topbar {
        padding: 12px 14px;
        gap: 10px;
    }

    .qp-player-center {
        order: 3;
        min-width: 100%;
        max-width: 100%;
    }

    .mq-card,
    .qp-flashcard-stage,
    .qp-round-checkpoint,
    .mq-results-card {
        padding: 20px 16px;
    }

    .qp-fc-face {
        padding: 20px 16px;
    }

    .dialog-header,
    .dialog-body,
    .dialog-footer {
        padding: 14px 16px;
    }
}

@media (max-width: 540px) {
    .stats-row,
    .qp-res-metrics,
    .mq-res-stats {
        grid-template-columns: 1fr;
    }

    .q-cards-grid {
        grid-template-columns: 1fr;
    }

    .server-chip {
        display: none;
    }

    .logo-title {
        font-size: 16px;
    }

    .search-box {
        flex: 1;
        width: auto;
        min-width: 110px;
    }

    .topbar-right {
        flex: 1;
        justify-content: flex-end;
        gap: 6px;
    }

    #btnTopStudyNow {
        min-width: 40px;
        width: 40px;
        height: 40px;
        padding: 0;
    }

    #btnTopStudyNow span {
        display: none;
    }

    .section-intro .intro-actions {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .section-intro .intro-actions .btn {
        min-width: 0;
        padding: 8px 12px;
        font-size: 13.5px;
    }

    .section-intro .intro-actions #btnHeroStartQuiz {
        grid-column: 1 / -1;
    }

    .ac-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .ac-header-right {
        width: 100%;
        justify-content: space-between;
    }

    .q-toolbar-left .input-compact,
    .q-toolbar-right .input-compact {
        flex: 1;
        min-width: 140px;
    }

    .q-toolbar-right #btnStudyFilteredSet {
        width: 100%;
    }

    .qp-cp-review-item {
        flex-direction: column;
        gap: 8px;
    }

    .qp-cp-actions,
    .mq-res-actions {
        width: 100%;
        flex-direction: column;
    }

    .qp-cp-actions .btn,
    .mq-res-actions .btn {
        width: 100%;
    }

    .token-save-row {
        flex-direction: column;
    }

    .toast-banner {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }
}

@media (max-width: 380px) {
    .logo-title {
        display: none;
    }
}

/* ==========================================================================
   Subject Manager Modal & Subject Cards
   ========================================================================== */
.subject-manager-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
    gap: 16px;
    margin-bottom: 8px;
}

.sm-card {
    background: var(--cb-bg);
    border: 1px solid var(--cb-border);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 12px;
    transition: border-color 0.18s ease, transform 0.18s var(--ease-out-expo), box-shadow 0.18s ease;
}

.sm-card:hover {
    border-color: var(--cb-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-level-2);
}

.sm-card.active {
    border: 2px solid var(--cb-primary);
    background: var(--cb-primary-tint);
}

.sm-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.sm-card-code {
    font-size: 18px;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--cb-text-primary);
}

.sm-card-metrics {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--cb-text-secondary);
}

.sm-card-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}