/* Progress bar */
.quiz-progress {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.progress-track {
    flex: 1;
    min-width: 80px;
    background: rgba(255,255,255,0.07);
    border-radius: 999px;
    height: 6px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-strong), #60a5fa);
    border-radius: 999px;
    width: 0%;
    transition: width 400ms ease;
}

/* Level selection grid */
.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.level-card {
    background: var(--card);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: var(--radius);
    padding: 1.4rem 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
    text-align: center;
}
.level-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}
.level-card.level-beginner:hover     { border-color: rgba(34,197,94,0.5); }
.level-card.level-intermediate:hover { border-color: rgba(245,158,11,0.5); }
.level-card.level-advanced:hover     { border-color: rgba(239,68,68,0.5); }

.level-icon { font-size: 2rem; line-height: 1; }
.level-name { font-size: 1.1rem; font-weight: 700; color: #fff; }
.level-desc { max-width: 200px; line-height: 1.4; }
.level-meta { margin-top: 0.3rem; }

/* Level badges */
.level-badge {
    display: inline-block;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}
.badge-beginner     { background: rgba(34,197,94,0.15);  color: #4ade80; }
.badge-intermediate { background: rgba(245,158,11,0.15); color: #fbbf24; }
.badge-advanced     { background: rgba(239,68,68,0.15);  color: #f87171; }

/* Question card */
.quiz-card { max-width: 640px; }

.quiz-question {
    font-size: 1.05rem;
    color: #fff;
    font-weight: 600;
    line-height: 1.55;
    margin: 0 0 1rem;
}

/* Options */
.quiz-options { display: flex; flex-direction: column; gap: 0.55rem; }

.quiz-option {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    color: var(--text);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    text-align: left;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background 120ms ease, border-color 120ms ease, transform 100ms ease;
}
.quiz-option:hover:not(:disabled) {
    background: rgba(96,165,250,0.1);
    border-color: rgba(96,165,250,0.4);
    transform: translateX(3px);
}
.quiz-option:disabled { cursor: default; }
.option-correct { background: rgba(34,197,94,0.15)  !important; border-color: #22c55e !important; color: #4ade80 !important; }
.option-wrong   { background: rgba(239,68,68,0.12)  !important; border-color: #ef4444 !important; color: #f87171 !important; }

/* Feedback box */
.feedback-box {
    margin-top: 0.9rem;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    border-left: 4px solid transparent;
}
.feedback-correct { background: rgba(34,197,94,0.08);  border-color: #22c55e; }
.feedback-wrong   { background: rgba(239,68,68,0.08);  border-color: #ef4444; }

.quiz-feedback-text { font-weight: 700; margin: 0 0 0.3rem; color: #fff; }
.quiz-explain       { margin: 0; line-height: 1.5; }

/* Outline button */
.btn-outline {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--text);
    padding: 0.8rem 1rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 140ms ease, background 140ms ease;
    width: 100%;
    max-width: 220px;
}
.btn-outline:hover { border-color: var(--accent); background: rgba(96,165,250,0.08); }

/* Results */
.result-breakdown { display: flex; flex-direction: column; gap: 0.5rem; text-align: left; margin-top: 0.5rem; }
.result-item {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.4rem;
    padding: 0.55rem 0.8rem;
    border-radius: 8px;
    font-size: 0.88rem;
}
.result-item.correct { background: rgba(34,197,94,0.1);  border-left: 3px solid #22c55e; }
.result-item.wrong   { background: rgba(239,68,68,0.08); border-left: 3px solid #ef4444; }
.result-icon { font-weight: 700; width: 1.2rem; flex-shrink: 0; }
.result-q    { color: var(--text); flex: 1; min-width: 0; }
.result-ans  { width: 100%; padding-left: 1.6rem; }

@media (max-width: 520px) {
    .level-grid { grid-template-columns: 1fr; }
    .quiz-card  { max-width: 100%; }
}