:root {
    --quiz-primary: #4f46e5;
    --quiz-primary-hover: #4338ca;
    --quiz-primary-light: #eef2ff;
    --quiz-success: #10b981;
    --quiz-success-bg: #ecfdf5;
    --quiz-danger: #ef4444;
    --quiz-danger-bg: #fef2f2;
    --quiz-bg: #f8fafc;
    --quiz-card-bg: #ffffff;
    --quiz-text: #1e293b;
    --quiz-muted: #64748b;
    --quiz-border: #e2e8f0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    min-height: 100vh;
    color: var(--quiz-text);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
    margin: 0;
}

.quiz-wrapper {
    width: 100%;
    max-width: 760px;
}

.quiz-card {
    background-color: var(--quiz-card-bg);
    border-radius: 1.25rem;
    box-shadow: 0 20px 45px -10px rgba(15, 23, 42, 0.12), 0 0 1px 1px rgba(15, 23, 42, 0.05);
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.9);
    position: relative;
}

.quiz-header-bar {
    height: 6px;
    width: 100%;
    background: linear-gradient(90deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
}

.quiz-body {
    padding: 2.25rem 2.25rem;
}

@media (max-width: 576px) {
    .quiz-body {
        padding: 1.5rem 1.25rem;
    }
}

/* Hero / Icon bubbles */
.quiz-icon-bubble {
    width: 76px;
    height: 76px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.quiz-icon-bubble.primary {
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
    color: var(--quiz-primary);
    box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.25);
}

.quiz-icon-bubble.success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #059669;
    box-shadow: 0 10px 20px -5px rgba(16, 185, 129, 0.25);
}

.quiz-icon-bubble.warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #d97706;
    box-shadow: 0 10px 20px -5px rgba(245, 158, 11, 0.25);
}

.quiz-icon-bubble.danger {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #dc2626;
    box-shadow: 0 10px 20px -5px rgba(239, 68, 68, 0.25);
}

/* Option buttons */
.quiz-option {
    display: flex;
    align-items: center;
    width: 100%;
    text-align: left;
    background-color: #ffffff;
    border: 2px solid var(--quiz-border);
    border-radius: 0.875rem;
    padding: 0.95rem 1.15rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--quiz-text);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    user-select: none;
    outline: none;
    margin-bottom: 0.75rem;
}

.quiz-option:hover:not(.is-disabled) {
    border-color: #818cf8;
    background-color: #f5f3ff;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px -3px rgba(99, 102, 241, 0.12);
}

.quiz-option:hover:not(.is-disabled) .quiz-option-letter {
    background-color: var(--quiz-primary);
    color: #ffffff;
    border-color: var(--quiz-primary);
}

.quiz-option.is-correct {
    background-color: var(--quiz-success-bg) !important;
    border-color: var(--quiz-success) !important;
    color: #065f46 !important;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

.quiz-option.is-correct .quiz-option-letter {
    background-color: var(--quiz-success);
    color: #ffffff;
    border-color: var(--quiz-success);
}

.quiz-option.is-wrong {
    background-color: var(--quiz-danger-bg) !important;
    border-color: var(--quiz-danger) !important;
    color: #991b1b !important;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
}

.quiz-option.is-wrong .quiz-option-letter {
    background-color: var(--quiz-danger);
    color: #ffffff;
    border-color: var(--quiz-danger);
}

.quiz-option.is-dimmed {
    opacity: 0.55;
    cursor: default;
}

.quiz-option.is-disabled {
    cursor: default;
    pointer-events: none;
}

.quiz-option-letter {
    width: 32px;
    height: 32px;
    min-width: 32px;
    border-radius: 50%;
    background-color: #f1f5f9;
    border: 1px solid #cbd5e1;
    color: #475569;
    font-size: 0.85rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.9rem;
    transition: all 0.2s ease;
}

.quiz-option-content {
    flex-grow: 1;
    line-height: 1.45;
}

.quiz-option-icon {
    margin-left: 0.75rem;
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Inline code & tag styling */
.quiz-inline-code {
    font-family: 'JetBrains Mono', Consolas, Monaco, monospace;
    background-color: #f1f5f9;
    color: #ec4899;
    padding: 0.15rem 0.45rem;
    border-radius: 0.375rem;
    font-size: 0.9em;
    border: 1px solid #e2e8f0;
}

.quiz-tag-badge {
    font-family: 'JetBrains Mono', Consolas, Monaco, monospace;
    color: #d946ef;
    background: #fdf2f8;
    padding: 0.2rem 0.5rem;
    border-radius: 0.375rem;
    border: 1px solid #fbcfe8;
    font-weight: 600;
}

/* Progress Bar */
.quiz-progress-track {
    height: 8px;
    border-radius: 9999px;
    background-color: #e2e8f0;
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    border-radius: 9999px;
    background: linear-gradient(90deg, #4f46e5 0%, #6366f1 100%);
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Question Illustration Image */
.quiz-question-img-container {
    background: #f8fafc;
    border: 1px solid var(--quiz-border);
    border-radius: 0.875rem;
    padding: 0.65rem;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.quiz-question-img {
    max-height: 180px;
    width: auto;
    max-width: 100%;
    display: inline-block;
}

.mistake-thumbnail {
    width: 90px;
    height: 50px;
    object-fit: contain;
    flex-shrink: 0;
}

/* Mistake Review Box */
.mistake-card {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-left: 4px solid var(--quiz-danger);
    border-radius: 0.75rem;
    padding: 1rem 1.25rem;
    margin-bottom: 0.85rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
    text-align: left;
}

.badge-subtle-danger {
    background-color: #fee2e2;
    color: #dc2626;
    border: 1px solid #fca5a5;
}

.badge-subtle-success {
    background-color: #d1fae5;
    color: #059669;
    border: 1px solid #6ee7b7;
}

/* Custom buttons */
.btn-quiz-primary {
    background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    color: #ffffff;
    border: none;
    padding: 0.85rem 2rem;
    font-weight: 600;
    border-radius: 0.75rem;
    box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.35);
    transition: all 0.2s ease;
}

.btn-quiz-primary:hover {
    background: linear-gradient(135deg, #4338ca 0%, #3730a3 100%);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 12px 24px -5px rgba(79, 70, 229, 0.45);
}

.btn-quiz-dark {
    background-color: #0f172a;
    color: #ffffff;
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 0.75rem;
    transition: all 0.2s ease;
}

.btn-quiz-dark:hover {
    background-color: #1e293b;
    color: #ffffff;
    transform: translateY(-1px);
}

/* Feature tags */
.feature-chip {
    background-color: #f8fafc;
    color: #475569;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.45rem 0.95rem;
    border-radius: 9999px;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    border: 1px solid #e2e8f0;
}

/* Fade animation */
.fade-in {
    animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

[v-cloak] {
    display: none !important;
}