:root {
    color-scheme: light;
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-2: #f7f7f7;
    --text: #000000;
    --muted: #606060;
    --line: #d1d5db;
    --primary: #000000;
    --primary-dark: #303030;
    --accent: #606060;
    --danger: #000000;
    --ok: #000000;
    --shadow: none;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family:
        Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
    font: inherit;
}

.home-shell,
.app-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.home-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
}

.home-panel {
    width: min(620px, 100%);
    background: var(--surface);
    border: 0;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    text-align: center;
}

.app-shell {
    padding: 64px 0 96px;
    display: grid;
    gap: 28px;
}

.topbar,
.section-heading,
.room-link-row,
.action-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

h1,
h2,
p {
    margin: 0;
}

h1 {
    font-size: clamp(3.6rem, 9vw, 6rem);
    line-height: 0.95;
    letter-spacing: 0;
    font-weight: 900;
}

h2 {
    font-size: clamp(1.6rem, 3vw, 2.7rem);
    line-height: 1.15;
    font-weight: 900;
}

.eyebrow {
    color: var(--accent);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: none;
    margin-bottom: 14px;
}

.lede,
.quiet {
    color: var(--muted);
    line-height: 1.55;
}

.home-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 36px;
}

.compact-actions {
    justify-content: flex-end;
}

.panel,
.metric-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: none;
}

.panel {
    padding: clamp(22px, 4vw, 36px);
    display: grid;
    gap: 24px;
}

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

label {
    display: grid;
    gap: 7px;
    color: var(--muted);
    font-size: 0.86rem;
    font-weight: 700;
}

input,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #ffffff;
    color: var(--text);
    padding: 13px 14px;
    outline: none;
}

textarea {
    resize: vertical;
    min-height: 136px;
    line-height: 1.45;
}

input:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
}

.room-link-row label {
    flex: 1;
}

.qr-panel {
    border: 1px solid var(--line);
    border-radius: 12px;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 28px;
    padding: 28px;
}

.qr-panel img {
    width: min(320px, 42vw);
    height: min(320px, 42vw);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 14px;
    background: white;
}

.qr-panel-small {
    padding: 18px;
}

.qr-panel-small img {
    width: min(180px, 30vw);
    height: min(180px, 30vw);
    padding: 10px;
}

.button {
    min-height: 44px;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 0 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: inherit;
    text-decoration: none;
    font-weight: 800;
    cursor: pointer;
}

.button.primary {
    background: var(--primary);
    color: white;
}

.button.primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.button.secondary {
    background: var(--surface-2);
    border-color: var(--line);
}

.button.secondary:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-1px);
}

.button.danger {
    background: #ffffff;
    border-color: var(--line);
    color: var(--danger);
}

.button.danger:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.button:disabled {
    cursor: not-allowed;
    opacity: 0.48;
}

.status-pill {
    min-width: 112px;
    min-height: 36px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-2);
    color: var(--muted);
    font-weight: 900;
    padding: 0 14px;
}

.status-pill.connected {
    background: var(--primary);
    color: white;
}

.block-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
}

.progression-block {
    min-height: 62px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #ffffff;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    text-align: center;
    font-weight: 900;
    line-height: 1.25;
    cursor: pointer;
}

.progression-block:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.progression-block:disabled {
    cursor: not-allowed;
    opacity: 0.72;
    transform: none;
}

.progression-block.selected {
    background: #000000;
    border-color: var(--primary);
    color: white;
}

.progression-block.correct {
    background: #000000;
    border-color: var(--ok);
    color: white;
}

.progression-block.revealed {
    box-shadow: inset 0 0 0 2px var(--ok);
}

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

.metric-card {
    padding: 22px;
    display: grid;
    gap: 10px;
}

.metric-card span {
    color: var(--muted);
    font-weight: 800;
}

.metric-card strong {
    font-size: 3rem;
    line-height: 1;
}

.metric-card em {
    color: var(--muted);
    font-size: 0.92rem;
    font-style: normal;
    font-weight: 900;
}

.response-list {
    display: grid;
    gap: 8px;
}

.progression-summary {
    display: grid;
    gap: 10px;
}

.summary-row {
    border: 1px solid var(--line);
    border-radius: 12px;
    display: grid;
    grid-template-columns: minmax(180px, 1fr) minmax(120px, auto) auto auto;
    align-items: center;
    gap: 12px;
    padding: 14px;
}

.summary-row .progression-name {
    font-weight: 900;
}

.summary-row .progression-count {
    color: var(--muted);
    font-weight: 800;
}

.summary-split {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.summary-row .progression-percent {
    font-size: 1.4rem;
    font-weight: 900;
}

.response-row {
    min-height: 52px;
    border: 1px solid var(--line);
    border-radius: 12px;
    display: grid;
    grid-template-columns: minmax(120px, 1fr) minmax(160px, 2fr) auto;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
}

.response-row .name {
    font-weight: 900;
}

.response-row .choice {
    color: var(--muted);
}

.badge {
    border-radius: 999px;
    padding: 6px 10px;
    font-size: 0.78rem;
    font-weight: 900;
    background: var(--surface-2);
    color: var(--muted);
}

.badge.correct {
    background: #000000;
    color: white;
}

.badge.incorrect {
    background: #f7f7f7;
    color: #000000;
}

.student-layout {
    max-width: 780px;
}

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

.answers-layout {
    max-width: 1120px;
}

.answers-setup-grid {
    grid-template-columns: 1fr;
}

.screen-reader-field {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

.student-blocks {
    grid-template-columns: 1fr;
}

.student-blocks .progression-block {
    min-height: 78px;
    font-size: 1.08rem;
}

@media (max-width: 760px) {
    .topbar,
    .section-heading,
    .room-link-row,
    .qr-panel,
    .action-row,
    .home-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .qr-panel {
        display: flex;
    }

    .qr-panel img {
        width: min(320px, 82vw);
        height: min(320px, 82vw);
        align-self: center;
    }

    .qr-panel-small img {
        width: min(180px, 62vw);
        height: min(180px, 62vw);
    }

    .field-grid,
    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .response-row {
        grid-template-columns: 1fr;
    }

    .summary-row {
        grid-template-columns: 1fr;
    }
}