* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0f1220;
    color: #eef1ff;
}

a {
    color: inherit;
    text-decoration: none;
}

.layout {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 260px 1fr;
}

.sidebar {
    background: #171b2f;
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    padding: 24px 18px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, #e8742a, #42a5f5);
    display: grid;
    place-items: center;
    font-size: 20px;
    font-weight: 700;
}

.brand-title {
    font-weight: 700;
    font-size: 18px;
}

.brand-subtitle {
    color: #9aa5c6;
    font-size: 13px;
}

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

.nav-link {
    padding: 12px 14px;
    border-radius: 12px;
    color: #b7c1dc;
    background: rgba(255, 255, 255, 0.02);
}

.nav-link:hover,
.nav-link.active {
    background: rgba(232, 116, 42, 0.18);
    color: #fff2e7;
}

.sidebar-footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.admin-pill {
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.04);
    color: #d6def9;
    font-size: 14px;
}

.logout-link {
    color: #ffbba0;
    font-size: 14px;
}

.content {
    padding: 28px;
}

.page-header {
    margin-bottom: 20px;
}

.page-header h1 {
    margin: 0 0 6px;
    font-size: 30px;
}

.page-header p {
    margin: 0;
    color: #9aa5c6;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 22px;
}

.stat-card {
    padding: 18px;
    border-radius: 16px;
    background: #171b2f;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-card h3 {
    margin: 0 0 8px;
    font-size: 14px;
    color: #9aa5c6;
    font-weight: 400;
}

.stat-card strong {
    font-size: 28px;
}

.panel {
    background: #171b2f;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 18px;
    padding: 18px;
    margin-bottom: 20px;
}

.panel h2 {
    margin-top: 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 14px;
}

.field label {
    color: #c7d0ea;
    font-size: 14px;
}

.field input,
.field select,
.field textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: #0f1220;
    color: #f4f6ff;
}

.field textarea {
    min-height: 110px;
    resize: vertical;
}

.checkbox-row {
    display: flex;
    gap: 18px;
    align-items: center;
    margin: 8px 0 16px;
}

.checkbox-row label {
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.btn,
button {
    cursor: pointer;
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    font-weight: 700;
}

.btn-primary,
button[type="submit"] {
    background: #e8742a;
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #e6ebff;
}

.btn-danger {
    background: #d64f45;
    color: white;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 12px 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    text-align: left;
    vertical-align: top;
}

th {
    color: #9aa5c6;
    font-weight: 600;
    font-size: 13px;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.badge-success {
    background: rgba(76, 175, 80, 0.18);
    color: #9be4a0;
}

.badge-muted {
    background: rgba(255, 255, 255, 0.08);
    color: #d0d7ef;
}

.badge-warning {
    background: rgba(232, 116, 42, 0.18);
    color: #ffd7bf;
}

.alert {
    margin-bottom: 18px;
    padding: 14px 16px;
    border-radius: 12px;
}

.alert-success {
    background: rgba(76, 175, 80, 0.15);
    color: #a7ebb0;
}

.alert-error {
    background: rgba(214, 79, 69, 0.18);
    color: #ffb8b0;
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 460px;
    background: #171b2f;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 24px;
}

.muted {
    color: #9aa5c6;
}

.lesson-category-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 22px;
}

.lesson-category-block {
    padding: 18px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.lesson-category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.lesson-category-header h3 {
    margin: 0;
    font-size: 18px;
}

.lesson-category-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lesson-category-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    padding: 14px 16px;
    border-radius: 14px;
    background: #101426;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.lesson-category-item-main {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.lesson-category-item-main strong {
    font-size: 16px;
    color: #fff4eb;
}

.lesson-category-item-main p {
    margin: 0;
}

.lesson-category-item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    color: #b8c2df;
    font-size: 13px;
}

.lesson-category-item-meta span {
    padding: 5px 9px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
}

.import-tab {
    padding: 10px 18px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.04);
    color: #b7c1dc;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
}
.import-tab:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #eef1ff;
}
.import-tab.active {
    background: rgba(232, 116, 42, 0.2);
    border-color: rgba(232, 116, 42, 0.5);
    color: #fff2e7;
}

.import-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 18px;
    max-width: 1160px;
    margin-left: auto;
    margin-right: auto;
}

.import-list {
    display: flex;
    flex-direction: column;
    gap: 22px;
    max-width: 1160px;
    margin: 0 auto;
}

.question-preview-card {
    padding: 16px 16px 14px;
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(24, 31, 54, 0.98), rgba(11, 15, 28, 1));
    border: 1px solid rgba(255, 255, 255, 0.09);
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
    position: relative;
    overflow: hidden;
    outline: 1px solid rgba(232, 116, 42, 0.18);
    outline-offset: -1px;
}

.question-preview-card + .question-preview-card::after {
    content: "";
    position: absolute;
    top: -12px;
    left: 20px;
    right: 20px;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, transparent, rgba(232, 116, 42, 0.72), rgba(66, 165, 245, 0.66), transparent);
}

.question-preview-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 18px;
    bottom: 18px;
    width: 4px;
    border-radius: 999px;
    background: linear-gradient(180deg, #e8742a, #42a5f5);
}

.question-preview-head {
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
    padding: 9px 11px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.07);
}

.question-preview-head strong {
    font-size: 16px;
    color: #fff4eb;
}

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

.question-preview-card .field {
    margin-bottom: 0;
}

.question-meta-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px 12px;
    align-items: end;
    margin-bottom: 10px;
}

.question-meta-field--date {
    min-width: 140px;
}

.question-meta-field--correct {
    min-width: 116px;
}

.question-preview-card .grid-2,
.question-preview-card .grid-3,
.question-preview-card .grid-4 {
    margin-bottom: 10px;
}

.question-preview-card .field input,
.question-preview-card .field select,
.question-preview-card .field textarea {
    padding: 7px 9px;
    font-size: 12.5px;
    border-radius: 10px;
}

.question-preview-card .field textarea {
    min-height: 56px;
    line-height: 1.35;
}

.compact-field label {
    font-size: 12px;
}

.question-meta-grid .field label {
    font-size: 12px;
}

.question-meta-grid .field input,
.question-meta-grid .field select {
    min-height: 36px;
}

.question-prompt-field textarea {
    min-height: 52px;
}

.question-explanation-field textarea {
    min-height: 48px;
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 10px;
}

.question-card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding-top: 12px;
    margin-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.02));
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .grid-3 {
        grid-template-columns: 1fr;
    }

    .import-toolbar,
    .question-preview-head,
    .lesson-category-item,
    .lesson-category-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .question-meta-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .option-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .question-meta-grid {
        grid-template-columns: 1fr;
    }
}