:root {
    color-scheme: dark;
    --background: #10111b;
    --surface: #191a28;
    --surface-raised: #202132;
    --border: rgba(255, 255, 255, .09);
    --text: #f5f5ff;
    --muted: #a1a3b9;
    --purple: #b29bff;
    --green: #68e4ad;
    font-family: "Segoe UI", Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(ellipse at 20% 0, rgba(120, 91, 211, .13), transparent 38%),
        var(--background);
    color: var(--text);
}

[hidden] {
    display: none !important;
}

button,
select {
    font: inherit;
}

button,
a,
select {
    -webkit-tap-highlight-color: transparent;
}

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

.admin-shell {
    width: min(1180px, calc(100% - 40px));
    min-height: 100vh;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 82px;
    border-bottom: 1px solid var(--border);
}

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

.brand {
    font-size: 20px;
    font-weight: 750;
    letter-spacing: -.5px;
}

.brand-icon {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: 11px;
    background: linear-gradient(140deg, #bba8ff, #8564ff);
    color: #171329;
}

.accent {
    color: var(--purple);
}

.brand-label,
.eyebrow {
    color: var(--purple);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 1.4px;
}

.brand-label {
    padding-left: 10px;
    border-left: 1px solid var(--border);
}

.text-link,
.muted {
    color: var(--muted);
}

.text-link:hover {
    color: var(--text);
}

.button {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 9px;
    cursor: pointer;
}

.button:disabled {
    opacity: .6;
    cursor: wait;
}

.primary {
    background: #9f83ff;
    color: #171329;
    font-weight: 700;
}

.secondary {
    background: var(--surface-raised);
    color: var(--text);
}

main {
    flex: 1;
    padding: 42px 0 58px;
}

.auth-panel {
    width: min(540px, 100%);
    margin: 8vh auto;
    padding: 32px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--surface);
}

.auth-panel h1,
.page-heading h1 {
    margin: 12px 0;
    font-size: clamp(28px, 5vw, 40px);
    letter-spacing: -1.2px;
}

.auth-panel > p,
.page-heading > p {
    color: var(--muted);
    line-height: 1.65;
}

.message {
    min-height: 20px;
    color: var(--muted);
    font-size: 13px;
}

.message.error {
    color: #ff8992;
}

.page-heading {
    margin-bottom: 25px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 13px;
    margin: 18px 0;
}

.summary-card,
.panel {
    min-width: 0;
    padding: 19px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--surface);
}

.summary-card span,
.learner-stats span,
.last-active span {
    display: block;
    color: var(--muted);
    font-size: 11px;
}

.summary-card strong {
    display: block;
    margin-top: 9px;
    font-size: 26px;
}

.learner-picker {
    margin-bottom: 16px;
}

.learner-picker label {
    display: block;
    margin-bottom: 9px;
    font-weight: 700;
}

.learner-picker select {
    width: min(620px, 100%);
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: var(--surface-raised);
    color: var(--text);
}

.learner-picker p {
    margin: 11px 0 0;
    font-size: 12px;
    line-height: 1.5;
}

.panel {
    margin-bottom: 15px;
}

.panel h2 {
    margin: 2px 0 15px;
    font-size: 18px;
}

.learner-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
}

.learner-heading h2 {
    margin: 8px 0 5px;
    font-size: 23px;
}

.learner-heading p {
    margin: 0;
}

.last-active {
    text-align: right;
}

.last-active strong {
    display: block;
    margin-top: 6px;
    font-size: 12px;
}

.learner-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin: 21px 0;
}

.learner-stats > div {
    padding: 12px;
    border-radius: 10px;
    background: var(--surface-raised);
}

.learner-stats strong {
    display: block;
    margin-bottom: 5px;
    font-size: 18px;
}

.current-work,
.record-row,
.submission-heading span,
.submission-heading time {
    color: var(--muted);
    font-size: 12px;
    overflow-wrap: anywhere;
}

.record-list,
.submission-list {
    display: grid;
}

.record-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 11px 0;
    border-bottom: 1px solid var(--border);
}

.record-row:last-child {
    border-bottom: 0;
}

.record-row strong {
    color: var(--muted);
    font-size: 11px;
    text-align: right;
}

.record-row strong.success {
    color: var(--green);
}

.submission {
    margin-top: 10px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface-raised);
}

.submission-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
}

.submission-heading > div {
    display: grid;
    gap: 5px;
}

.submission-heading time {
    text-align: right;
}

.submission pre {
    max-height: 480px;
    overflow: auto;
    margin: 14px 0 0;
    padding: 15px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #141520;
    color: #d4c9ff;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    font: 12px/1.7 Consolas, monospace;
}

.empty {
    padding: 28px;
    color: var(--muted);
    text-align: center;
}

footer {
    padding: 20px 0;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 12px;
}

@media (max-width: 700px) {
    .admin-shell {
        width: min(100% - 26px, 1180px);
    }

    .topbar {
        min-height: 68px;
    }

    .brand-label {
        display: none;
    }

    .header-actions {
        gap: 8px;
        font-size: 12px;
    }

    main {
        padding-top: 28px;
    }

    .summary-grid,
    .learner-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .learner-heading,
    .submission-heading {
        flex-direction: column;
    }

    .last-active,
    .submission-heading time {
        text-align: left;
    }

    .record-row {
        flex-direction: column;
        gap: 5px;
    }

    .record-row strong {
        text-align: left;
    }

    .auth-panel {
        padding: 23px;
    }
}