/* =========================================================
   Operating System Activity Classifier Widget
   Section 8.02
   ========================================================= */

.os-activity-widget {
    margin: 1.5rem 0;
    padding: 1.25rem;
    border-radius: 24px;
    background: linear-gradient(135deg, #f8fafc, #eef2ff);
    border: 1px solid #dbeafe;
    box-shadow: 0 16px 38px rgba(15, 23, 42, 0.08);
}

.os-widget-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 1rem;
    align-items: stretch;
}

.os-card-panel,
.os-choice-panel,
.os-feedback-box {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    padding: 1rem;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
}

.os-card-panel h3,
.os-choice-panel h3 {
    margin-top: 0;
}

.os-card-label {
    margin: 0 0 0.7rem;
    color: #64748b;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.os-activity-card {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1rem;
    border-radius: 18px;
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    color: #312e81;
    font-size: 1.15rem;
    font-weight: 800;
    line-height: 1.45;
}

.os-card-controls {
    display: flex;
    gap: 0.6rem;
    margin-top: 0.9rem;
    flex-wrap: wrap;
}

.os-card-controls button,
.os-choice-btn {
    border: none;
    border-radius: 999px;
    padding: 0.55rem 0.85rem;
    cursor: pointer;
    font-weight: 800;
    transition: all 0.2s ease;
}

.os-card-controls button {
    background: #0f172a;
    color: white;
}

.os-card-controls button:hover,
.os-choice-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.14);
}

.os-choice-buttons {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
}

.os-choice-btn {
    background: #f8fafc;
    color: #334155;
    border: 1px solid #e2e8f0;
    text-align: left;
}

.os-choice-btn.correct {
    background: #dcfce7;
    border-color: #86efac;
    color: #14532d;
}

.os-choice-btn.incorrect {
    background: #fee2e2;
    border-color: #fecaca;
    color: #7f1d1d;
}

.os-feedback-box {
    margin-top: 1rem;
    color: #334155;
    line-height: 1.6;
}

.os-feedback-box.success {
    background: #f0fdf4;
    border-color: #bbf7d0;
    color: #14532d;
}

.os-feedback-box.warning {
    background: #fff7ed;
    border-color: #fed7aa;
    color: #7c2d12;
}

.os-progress-row {
    display: flex;
    gap: 0.45rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.os-progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background: #cbd5e1;
}

.os-progress-dot.active {
    background: #4f46e5;
}

.os-progress-dot.done {
    background: #22c55e;
}

.reveal .os-mini-stack {
    display: grid;
    gap: 0.8rem;
}

.reveal .os-mini-stack div {
    padding: 1rem;
    border-radius: 20px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #0f172a;
    font-size: 1.25rem;
    font-weight: 800;
    text-align: center;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.reveal .os-mini-stack .stress {
    background: #eef2ff;
    border-color: #c7d2fe;
    color: #3730a3;
}

.reveal .os-category-grid-slide {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    margin-top: 1.2rem;
}

.reveal .os-category-grid-slide div {
    padding: 0.85rem 1rem;
    border-radius: 18px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #334155;
    font-size: 1.15rem;
    font-weight: 800;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

@media (max-width: 800px) {
    .os-widget-grid,
    .os-choice-buttons,
    .reveal .os-category-grid-slide {
        grid-template-columns: 1fr;
    }
}