.module-stack {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 18px;
}

.course-page-banner {
    overflow: hidden;
    border: 1px solid rgba(231, 231, 234, 0.9);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

.course-page-banner img {
    display: block;
    width: 100%;
    height: clamp(180px, 28vw, 320px);
    object-fit: cover;
}

.module-card {
    display: grid;
    gap: 18px;
    padding: 22px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(231, 231, 234, 0.9);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.module-card__header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
}

.module-card__header h3 {
    margin: 8px 0 6px;
    color: var(--primary);
}

.module-card__header p {
    margin: 0;
    color: var(--muted);
}

.module-card__summary {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.module-card__summary span {
    padding: 10px 14px;
    border-radius: 14px;
    background: var(--surface-soft);
    color: var(--muted-strong);
    font-weight: 600;
}

.lesson-item--locked {
    background: linear-gradient(180deg, #fcfcfd 0%, #f5f7fb 100%);
}

.video-upload-card {
    display: grid;
    gap: 16px;
}

.video-upload-progress {
    display: grid;
    gap: 10px;
}

.video-upload-progress__bar {
    width: 100%;
    height: 14px;
    border-radius: 999px;
    overflow: hidden;
    background: var(--primary-soft);
    border: 1px solid rgba(31, 45, 104, 0.08);
}

.video-upload-progress__bar span {
    display: block;
    height: 100%;
    width: 0;
    background: linear-gradient(135deg, var(--primary) 0%, #4052a0 100%);
    transition: width 0.2s ease;
}

.video-preview-card {
    display: grid;
    gap: 16px;
}

.video-preview-card__poster {
    width: 100%;
    max-height: 280px;
    object-fit: cover;
    border-radius: 20px;
    border: 1px solid var(--line);
}

.video-preview-card__player {
    width: 100%;
    border-radius: 24px;
    background: #000;
    box-shadow: var(--shadow-md);
}

.video-preview-card__player--secure {
    position: relative;
    z-index: 1;
    user-select: none;
    -webkit-user-select: none;
}

.secure-video-shell {
    position: relative;
    overflow: hidden;
    border-radius: 24px;
    background: #000;
}

.secure-video-watermark {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: space-between;
    gap: 24px;
    padding: 20px;
    pointer-events: none;
}

.secure-video-watermark span {
    justify-self: center;
    align-self: center;
    padding: 10px 14px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(10, 16, 34, 0.18);
    color: rgba(255, 255, 255, 0.22);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-align: center;
    transform: rotate(-16deg);
    backdrop-filter: blur(2px);
}

.status-panel--secure {
    border-style: dashed;
}

.lesson-live-card {
    display: grid;
    gap: 16px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: linear-gradient(180deg, #fbfcff 0%, #f4f7fb 100%);
}

.lesson-live-card p {
    margin: 0;
}

.lesson-live-card__summary {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.question-builder {
    display: grid;
    gap: 10px;
}

.question-builder > label:first-child {
    margin-bottom: 2px;
}

.question-builder__option {
    display: grid;
    grid-template-columns: 18px minmax(0, 1fr);
    gap: 10px;
    align-items: center;
}

.question-builder__option input[type="radio"] {
    width: 16px;
    height: 16px;
    margin: 0;
}

.question-builder__option input[type="text"] {
    width: 100%;
}

.modal-card--question {
    width: min(100%, 780px);
    border-radius: 18px;
    gap: 16px;
}

.modal-card--question .form-grid {
    gap: 16px;
}

.modal-card--question textarea {
    min-height: 112px;
}

.modal-card--question .button-row {
    grid-column: 1 / -1;
}

.modal-card--question .button--primary {
    width: 100%;
    justify-content: center;
}

.simulado-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 28px;
    align-items: center;
    margin: 0 0 24px;
    border-bottom: 1px solid var(--line);
}

.simulado-tabs a {
    position: relative;
    padding: 0 4px 18px;
    color: var(--muted-strong);
    font-weight: 700;
    text-decoration: none;
}

.simulado-tabs a.is-active {
    color: #1f56f3;
}

.simulado-tabs a.is-active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    background: #1f56f3;
}

.results-panel {
    padding: 0;
    overflow: hidden;
}

.results-panel__title {
    padding: 16px 20px;
    background: #273fb8;
    color: #fff;
}

.results-panel__title h2 {
    margin: 0;
    color: #fff;
    font-size: 1.2rem;
}

.results-filter {
    display: grid;
    grid-template-columns: minmax(180px, 1.4fr) minmax(150px, 0.9fr) minmax(150px, 0.9fr) minmax(180px, 1fr) minmax(180px, 1fr) auto;
    gap: 14px;
    align-items: end;
    padding: 22px 24px 10px;
}

.results-filter__actions {
    align-self: end;
}

.results-summary {
    margin: 8px 24px 18px;
}

.results-table th {
    background: #e5e7eb;
    color: #111827;
}

.results-score {
    font-weight: 800;
}

.results-score--good {
    color: #139447;
}

.results-score--bad {
    color: #d01818;
}

@media print {
    .sidebar,
    .topbar,
    .simulado-tabs,
    .results-filter,
    .results-summary,
    .button-row {
        display: none !important;
    }

    .app-shell,
    .app-main,
    .content {
        display: block;
        margin: 0;
        padding: 0;
    }

    .results-panel {
        box-shadow: none;
        border: 0;
    }
}

@media (max-width: 760px) {
    .module-stack {
        grid-template-columns: 1fr;
    }

    .secure-video-watermark {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 16px;
    }

    .module-card,
    .lesson-live-card {
        padding: 18px;
    }

    .module-card__header {
        flex-direction: column;
    }

    .simulado-tabs {
        gap: 16px;
    }

    .results-filter {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1180px) and (min-width: 761px) {
    .module-stack {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}