body {
    font-family: "Segoe UI", system-ui, sans-serif;
    background: #0b1020;
    color: #f5f7ff;
    margin: 0;
}

/* Compact top ribbon header */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: linear-gradient(90deg, #0f1726, #0b1222);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 18px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.6);
    z-index: 1000;
}

.top-bar img.logo { height: 36px; }
.brand-title { font-size: 1.05rem; font-weight: 600; margin-left: 8px; }
.top-actions { font-size: 0.9rem; color: #cfefff; display: flex; align-items: center; gap: 14px; }
.top-nav { display: flex; align-items: center; gap: 10px; }
.top-nav a { color: #cfefff; text-decoration: none; font-weight: 600; }
.top-nav a:hover { color: #ffffff; }

.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.admin-card {
    background: linear-gradient(135deg, #1b2340, #151a2c);
    border-radius: 14px;
    padding: 18px;
}

.admin-card h2 {
    margin-top: 0;
    margin-bottom: 12px;
}

.admin-card label {
    display: block;
    margin-top: 10px;
    margin-bottom: 6px;
    font-weight: 600;
}

.admin-card input,
.admin-card select,
.admin-card textarea {
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 10px;
    padding: 0.7rem 0.9rem;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.14);
    background: #f7fbff;
    color: #102033;
}

.admin-card select option,
.admin-card select {
    color: #102033;
}

.checkbox-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 10px;
}

.checkbox-row {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #f5f7ff;
    line-height: 1.2;
    min-height: 24px;
}

.checkbox-row input {
    accent-color: #41d2ff;
    margin: 0;
    flex-shrink: 0;
}

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

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

.table-wrap th,
.table-wrap td {
    text-align: left;
    padding: 10px 8px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.inline-actions {
    display: inline-block;
}

.full-width {
    margin-top: 16px;
}

button.secondary {
    padding: 0.6rem 1rem;
}

button.secondary:hover {
    transform: none;
}

button,
input[type="submit"],
input[type="button"],
input[type="reset"] {
    appearance: none;
    border: none;
    border-radius: 999px;
    padding: 0.85rem 1.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #4e8cff, #41d2ff);
    box-shadow: 0 8px 24px rgba(31, 129, 255, 0.18);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

button:hover,
input[type="submit"]:hover,
input[type="button"]:hover,
input[type="reset"]:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(31, 129, 255, 0.22);
}

button:active,
input[type="submit"]:active,
input[type="button"]:active,
input[type="reset"]:active {
    transform: translateY(0);
    box-shadow: 0 6px 16px rgba(31, 129, 255, 0.16);
}

button.secondary,
input.secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #dceeff;
    border: 1px solid rgba(255, 255, 255, 0.12);
}

button.flat-icon,
button.delete-icon {
    width: 38px;
    min-width: 38px;
    height: 38px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: #111a2e;
    color: #f5f7ff;
    box-shadow: none;
}

button.flat-icon:hover,
button.delete-icon:hover {
    background: #172339;
}

button.delete-icon {
    background: #ff3d6b;
    color: #fff;
}

button.delete-icon:hover {
    background: #ff5a88;
}

button.icon-btn,
input.icon-btn {
    width: 44px;
    min-width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.08);
    color: #cfefff;
}

button.icon-btn:hover,
input.icon-btn:hover {
    background: rgba(255, 255, 255, 0.14);
}

button .icon,
input .icon {
    font-size: 1.15rem;
}

/* Prevent page content from being hidden under fixed header */
body { padding-top: 56px; }

.app-shell {
    max-width: 1100px;
    margin: 40px auto;
    background: #141a33;
    border-radius: 16px;
    padding: 24px 32px;
    box-shadow: 0 0 40px rgba(0,0,0,0.6);
    position: relative;
}

.admin-main-layout {
    display: flex;
    gap: 20px;
}

.admin-actions-bar {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.action-spacer {
    flex: 1 1 auto;
    min-width: 16px;
}

.inline-import-form {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.inline-import-form input[type="file"] {
    color: #cfefff;
}

.app-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.app-header img.logo {
    height: 40px;
}

.app-title {
    font-size: 1.4rem;
    font-weight: 600;
}

/* MCQ blocks by theme */
.theme-block {
    margin-bottom: 32px;
    padding: 16px 20px;
    border-radius: 12px;
    background: linear-gradient(135deg, #1b2340, #151a2c);
}

.theme-title {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

/* Question + hint */
.question {
    margin-bottom: 18px;
}

.hint {
    margin-top: 6px;
    font-size: 0.9rem;
    color: #a5b0ff;
    display: none;
}

.hint-toggle {
    font-size: 0.85rem;
    color: #7fd0ff;
    cursor: pointer;
}

/* Collapsibles for teacher view */
.collapsible {
    background: #1b2340;
    border-radius: 10px;
    margin-bottom: 12px;
}

.collapsible-header {
    padding: 10px 14px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.collapsible-body {
    display: none;
    padding: 10px 14px 14px;
    border-top: 1px solid #252b4a;
}

.radar-layout {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    align-items: flex-start;
    margin-top: 20px;
}

.radar-summary,
.radar-chart-panel {
    background: #0f172b;
    border-radius: 18px;
    padding: 22px;
}

.radar-summary {
    flex: 1 1 280px;
    min-width: 280px;
}

.radar-chart-panel {
    flex: 2 1 520px;
    min-width: 320px;
}

.dashboard-chart-panel {
    background: #0f172b;
    border-radius: 18px;
    padding: 22px;
    margin-bottom: 24px;
    min-height: 380px;
}

.dashboard-chart-panel h2 {
    margin-top: 0;
    margin-bottom: 18px;
    font-size: 1.25rem;
}

.dashboard-chart-panel canvas {
    display: block;
    width: 100% !important;
    max-height: 360px !important;
    height: 360px !important;
}

.radar-summary h3 {
    margin-top: 0;
    margin-bottom: 14px;
    font-size: 1.15rem;
}

.summary-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.summary-list li {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 14px;
    margin-bottom: 10px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.05);
}

.summary-list li strong {
    color: #c8ddff;
}

.summary-key {
    color: #aabce1;
}

.summary-value {
    font-weight: 700;
    color: #fff;
}

.summary-value.score {
    color: #7fffb7;
}

@media (max-width: 860px) {
    .radar-layout {
        flex-direction: column;
    }
}

.export-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.notice {
    padding: 14px 18px;
    border-radius: 14px;
    margin-bottom: 18px;
    font-weight: 600;
}

.notice.success {
    background: rgba(72, 187, 120, 0.18);
    color: #c7f7d6;
}

.notice.error {
    background: rgba(255, 76, 119, 0.18);
    color: #ffd5de;
}

.radar-summary .summary-list {
    margin-bottom: 18px;
}

.export-actions button {
    width: auto;
    min-width: 140px;
}

.login-card form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.login-card input,
.login-card button {
    width: 100%;
}

#question-form .option-field {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

#question-form button {
    margin-top: 18px;
}

/* Login central card */
.login-card {
    max-width: 420px;
    margin: 80px auto;
    padding: 24px 28px;
    background: #141a33;
    border-radius: 16px;
    text-align: center;
}

.login-card img.logo-login {
    height: 60px;
    margin-bottom: 18px;
}
body { padding-bottom: 26px; }

.app-footer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: 20px;
    margin: 0;
    padding: 0;
    background: #0b1222;
    z-index: 1000;
}

.app-footer .footer-content {
    border-top: 1px solid rgba(159, 179, 255, 0.18);
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 12px;
    font-size: 0.7rem;
    line-height: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Admin list styles */
.theme-item {
    background: #0f1628;
    padding: 8px 10px;
    margin-bottom: 10px;
    border-radius: 8px;
}
.theme-item .theme-handle { display:inline-block; margin-right:8px; cursor:grab; }
.questions-list { margin-top:8px; padding-left:6px; }
.question-item { background:#0b1326; padding:6px 8px; margin-bottom:6px; border-radius:6px; cursor:grab; }