:root {
    --bg: #f6fbf8;
    --surface: #ffffff;
    --ink: #14231a;
    --muted: #607068;
    --line: #dce8e2;
    --green: #1f7a4d;
    --green-dark: #145b38;
    --coral: #e95d43;
    --yellow: #f4c542;
    --aqua: #39a7a5;
    --danger: #b42318;
    --shadow: 0 18px 48px rgba(20, 35, 26, 0.12);
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: light;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: 0;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--ink);
}

body.test-mode {
    user-select: none;
}

a {
    color: inherit;
}

button,
input,
select,
textarea {
    font: inherit;
}

button,
.primary-button,
.secondary-button,
.small-button {
    border-radius: 8px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 1rem;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
}

.brand {
    text-decoration: none;
    font-size: 1.1rem;
}

.brand span {
    color: var(--muted);
}

.topbar nav {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.95rem;
}

.topbar form {
    margin: 0;
}

.link-button {
    border: 0;
    background: transparent;
    color: var(--green-dark);
    padding: 0;
    cursor: pointer;
}

.login-shell {
    min-height: 100vh;
    display: grid;
    grid-template-rows: 44vh auto;
    background: var(--surface);
}

.login-visual {
    display: flex;
    align-items: end;
    padding: 1.3rem;
    color: #ffffff;
    background:
        linear-gradient(180deg, rgba(20, 35, 26, 0.12), rgba(20, 35, 26, 0.82)),
        url("https://images.unsplash.com/photo-1509228468518-180dd4864904?auto=format&fit=crop&w=1400&q=80") center / cover;
}

.login-visual h1 {
    max-width: 12ch;
    margin: 0;
    font-size: 2.25rem;
    line-height: 1;
}

.login-visual p:last-child {
    max-width: 28rem;
    margin-bottom: 0;
    color: rgba(255, 255, 255, 0.88);
}

.login-panel {
    padding: 1.4rem;
    align-self: start;
}

.login-panel h2,
.page h1,
.page h2,
.test-head h1 {
    margin: 0;
    line-height: 1.08;
}

.eyebrow {
    margin: 0 0 0.45rem;
    color: var(--green-dark);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

.stacked-form {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.stacked-form label,
.feedback-box {
    display: grid;
    gap: 0.4rem;
    font-weight: 700;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.9rem;
    background: #ffffff;
    color: var(--ink);
}

input:focus,
select:focus,
textarea:focus {
    outline: 3px solid rgba(57, 167, 165, 0.24);
    border-color: var(--aqua);
}

.role-picker {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.7rem;
    padding: 0;
    margin: 0;
    border: 0;
}

.role-picker legend {
    grid-column: 1 / -1;
    font-weight: 800;
}

.role-picker label {
    display: block;
}

.role-picker input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.role-picker span {
    display: block;
    padding: 0.85rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    text-align: center;
    background: #ffffff;
}

.role-picker input:checked + span {
    border-color: var(--green);
    background: #e6f5ec;
    color: var(--green-dark);
}

.primary-button,
.secondary-button,
.small-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    border: 0;
    padding: 0.8rem 1rem;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
}

.primary-button {
    background: var(--green);
    color: #ffffff;
}

.primary-button:hover {
    background: var(--green-dark);
}

.secondary-button {
    border: 1px solid var(--green);
    background: #ffffff;
    color: var(--green-dark);
}

.small-button {
    min-height: 2.2rem;
    background: #e6f5ec;
    color: var(--green-dark);
    font-size: 0.9rem;
}

.wide {
    width: 100%;
}

.page,
.test-shell {
    width: min(1100px, 100%);
    margin: 0 auto;
    padding: 1rem;
}

.narrow {
    width: min(760px, 100%);
}

.intro-band,
.panel,
.metric,
.mark-row {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.intro-band {
    padding: 1.2rem;
    margin: 0.6rem 0 1rem;
    border-left: 6px solid var(--green);
}

.intro-band p:last-child {
    margin-bottom: 0;
    color: var(--muted);
}

.panel {
    padding: 1rem;
    margin: 1rem 0;
}

.urgent {
    border-left: 6px solid var(--coral);
}

.section-heading {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.info-grid,
.metric-grid {
    display: grid;
    gap: 0.75rem;
}

.info-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 1rem 0;
}

.info-grid div,
.metric {
    padding: 0.85rem;
    background: #f7faf8;
    border: 1px solid var(--line);
    border-radius: 8px;
}

dt {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

dd {
    margin: 0.25rem 0 0;
    font-weight: 800;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
    border-radius: 999px;
    padding: 0.35rem 0.65rem;
    background: #eef5f1;
    color: var(--green-dark);
    font-size: 0.8rem;
    font-weight: 900;
}

.status-pill.closed,
.status-pill.error,
.status-pill.submitted {
    background: #fff1ec;
    color: var(--danger);
}

.status-pill.open,
.status-pill.posted,
.status-pill.success {
    background: #e6f5ec;
    color: var(--green-dark);
}

.status-pill.marked,
.status-pill.upcoming {
    background: #fff8d8;
    color: #75600d;
}

.notice,
.flash {
    margin: 0.8rem auto;
    width: min(1100px, calc(100% - 2rem));
    padding: 0.9rem;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: #ffffff;
}

.notice.warning {
    border-color: #f2c94c;
    background: #fff9df;
}

.notice.error,
.flash.error {
    border-color: #ffd0c8;
    background: #fff1ec;
    color: var(--danger);
}

.notice.success,
.flash.success {
    border-color: #b9e6cb;
    background: #e6f5ec;
    color: var(--green-dark);
}

.hint,
.muted,
small {
    color: var(--muted);
}

.clean-list {
    padding-left: 1.2rem;
}

.clean-list li + li {
    margin-top: 0.55rem;
}

.check-row {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    gap: 0.7rem;
}

.check-row input {
    width: auto;
    margin-top: 0.25rem;
}

.practice-grid,
.learner-list {
    display: grid;
    gap: 0.75rem;
}

.test-card-grid {
    display: grid;
    gap: 0.85rem;
}

.test-card {
    display: grid;
    gap: 0.9rem;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
}

.test-card h3 {
    margin: 0;
    line-height: 1.15;
}

.test-card p {
    margin: 0.25rem 0 0;
}

.mini-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.55rem;
}

.mini-grid div {
    padding: 0.65rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f7faf8;
}

.notice.compact {
    width: 100%;
    margin: 0;
    padding: 0.65rem;
}

.test-card-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.55rem;
}

.practice-tile,
.learner-list div {
    display: grid;
    gap: 0.25rem;
    padding: 0.95rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    text-decoration: none;
}

.practice-tile {
    border-left: 5px solid var(--aqua);
}

.metric-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin: 1rem 0;
}

.metric {
    text-align: center;
}

.metric span {
    display: block;
    color: var(--green-dark);
    font-size: 2rem;
    font-weight: 900;
}

.metric p {
    margin: 0.2rem 0 0;
    color: var(--muted);
    font-weight: 700;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: 8px;
}

table {
    width: 100%;
    min-width: 700px;
    border-collapse: collapse;
    background: #ffffff;
}

th,
td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}

th {
    background: #f7faf8;
    font-size: 0.8rem;
    text-transform: uppercase;
}

.footer {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--muted);
}

.footer p {
    margin: 0.2rem 0;
}

.setup-error {
    width: min(760px, calc(100% - 2rem));
    margin: 4rem auto;
    padding: 1.5rem;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.test-shell {
    padding-bottom: 7rem;
}

.test-head {
    position: sticky;
    top: 0;
    z-index: 8;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin: -1rem -1rem 1rem;
    padding: 1rem;
    background: rgba(246, 251, 248, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
}

.timer {
    min-width: 5.2rem;
    padding: 0.75rem 0.8rem;
    border-radius: 8px;
    background: var(--ink);
    color: #ffffff;
    font-size: 1.35rem;
    font-weight: 900;
    text-align: center;
}

.question-form,
.practice-form,
.mark-form {
    display: grid;
    gap: 1rem;
}

.question-list,
.mark-list {
    display: grid;
    gap: 0.7rem;
}

.question-row {
    display: grid;
    grid-template-columns: 1fr 7.5rem;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.question-meta {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: baseline;
    gap: 0.45rem;
}

.question-meta small {
    grid-column: 1 / -1;
    margin-left: 1.55rem;
}

.math-expression {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.18rem;
    font-weight: 850;
    line-height: 1.35;
}

.math-expression sup {
    display: inline-flex;
    align-items: center;
    min-height: 1.35em;
    font-size: 0.72em;
    line-height: 1;
    transform: translateY(-0.18em);
}

.math-fraction {
    display: inline-grid;
    grid-template-rows: auto 2px auto;
    align-items: center;
    justify-items: center;
    min-width: 1.35em;
    margin: 0 0.08rem;
    vertical-align: middle;
}

.math-fraction .fraction-top,
.math-fraction .fraction-bottom {
    display: block;
    padding: 0 0.18rem;
    font-size: 0.9em;
    line-height: 1.05;
}

.math-fraction .fraction-line {
    width: 100%;
    min-width: 1.15em;
    height: 2px;
    background: currentColor;
}

.math-root {
    display: inline-flex;
    align-items: end;
    gap: 0.03rem;
}

.root-sign {
    font-size: 1.2em;
    line-height: 1;
}

.radicand {
    padding: 0 0.15rem 0.02rem;
    border-top: 2px solid currentColor;
    line-height: 1.05;
}

.question-row input {
    min-height: 3rem;
    text-align: center;
    font-weight: 900;
}

.answer-control {
    width: 100%;
}

.fraction-answer {
    display: grid;
    grid-template-rows: 2.65rem 2px 2.65rem;
    align-items: center;
    justify-items: stretch;
    gap: 0.25rem;
}

.fraction-answer input {
    min-height: 2.65rem;
    padding: 0.45rem;
}

.fraction-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--ink);
}

.submit-button {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    left: 1rem;
    z-index: 9;
    box-shadow: var(--shadow);
}

.lock-overlay {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: rgba(20, 35, 26, 0.84);
    color: #ffffff;
    font-weight: 900;
    text-align: center;
}

body.locked .lock-overlay {
    display: flex;
}

.practice-result {
    min-height: 1.5rem;
    font-weight: 900;
}

.practice-row.correct {
    border-color: #9bd8b5;
    background: #effaf3;
}

.practice-row.wrong {
    border-color: #ffc2b7;
    background: #fff5f2;
}

.mark-form {
    margin-bottom: 2rem;
}

.mark-row {
    display: grid;
    grid-template-columns: 1fr 7rem;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem;
}

.mark-row p {
    margin: 0 0 0.25rem;
}

.mark-row label {
    display: grid;
    gap: 0.3rem;
    font-weight: 800;
}

.feedback-box {
    padding: 1rem;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.test-editor-form {
    display: grid;
    gap: 1rem;
}

.editor-grid {
    display: grid;
    gap: 1rem;
}

.editor-grid label,
.question-editor-row label,
.duration-fields {
    display: grid;
    gap: 0.35rem;
    font-weight: 800;
}

.duration-fields {
    grid-template-columns: 1fr 1fr;
    align-items: end;
}

.duration-fields > span,
.duration-fields small {
    grid-column: 1 / -1;
}

.duration-fields label {
    display: grid;
    gap: 0.35rem;
}

.question-editor-list {
    display: grid;
    gap: 0.85rem;
}

.question-editor-row {
    display: grid;
    grid-template-columns: 2.7rem minmax(14rem, 1.5fr) minmax(9rem, 0.75fr) 5.5rem minmax(8rem, 0.75fr) minmax(8rem, 0.75fr);
    gap: 0.75rem;
    align-items: end;
    padding: 0.85rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
}

.question-editor-number {
    display: grid;
    place-items: center;
    min-height: 2.75rem;
    border-radius: 8px;
    background: #e6f5ec;
    color: var(--green-dark);
    font-weight: 900;
}

.question-preview {
    grid-column: 2 / -1;
    color: var(--muted);
    font-size: 0.9rem;
}

.question-preview span {
    font-weight: 900;
    color: var(--ink);
}

.editor-actions {
    margin-bottom: 2rem;
}

.preview-shell {
    width: 100%;
    padding: 0;
}

.preview-test-head {
    position: static;
    margin: 0 0 1rem;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.preview-instructions {
    padding: 0.9rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f7faf8;
}

.simulator-actions,
.preview-actions {
    margin-top: 1rem;
}

.simulator-result {
    margin-bottom: 2rem;
}

.total-override {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.total-override label {
    display: grid;
    gap: 0.35rem;
    font-weight: 800;
}

.button-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.teacher-note {
    padding: 0.9rem;
    border-left: 5px solid var(--yellow);
    background: #fff9df;
    border-radius: 8px;
}

summary {
    cursor: pointer;
    font-weight: 900;
}

@media (min-width: 780px) {
    .login-shell {
        grid-template-columns: minmax(0, 1fr) 28rem;
        grid-template-rows: 1fr;
    }

    .login-visual,
    .login-panel {
        min-height: 100vh;
    }

    .login-panel {
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding: 2rem;
    }

    .login-visual {
        padding: 2rem;
    }

    .login-visual h1 {
        font-size: 4rem;
    }

    .page,
    .test-shell {
        padding: 1.5rem;
    }

    .panel,
    .intro-band {
        padding: 1.35rem;
    }

    .info-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .practice-grid,
    .learner-list,
    .test-card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .test-card-actions {
        grid-template-columns: 1fr 1fr;
    }

    .button-row {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .total-override {
        grid-template-columns: 1fr 12rem;
        align-items: end;
    }

    .editor-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .submit-button {
        left: auto;
        width: 18rem;
    }
}

@media (max-width: 620px) {
    .metric-grid {
        grid-template-columns: 1fr;
    }

    .section-heading {
        display: grid;
    }

    .info-grid,
    .mini-grid,
    .question-row,
    .mark-row,
    .question-editor-row {
        grid-template-columns: 1fr;
    }

    .question-preview {
        grid-column: auto;
    }

    .question-row input {
        text-align: left;
    }

    .fraction-answer input {
        text-align: center;
    }

    .test-head {
        align-items: end;
    }

    .test-head h1 {
        font-size: 1.25rem;
    }

    .topbar {
        align-items: start;
    }

    .topbar nav {
        flex-wrap: wrap;
        justify-content: end;
    }
}