:root {
    color-scheme: light;
    --ink: #17202a;
    --muted: #65758b;
    --line: #d7dde6;
    --panel: #ffffff;
    --bg: #eef2f5;
    --navy: #254f7b;
    --teal: #0f8b8d;
    --green: #6f9f2f;
    --red: #b64242;
    --gold: #c89023;
}

* {
    box-sizing: border-box;
}

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

.shell {
    width: min(1240px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 44px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 24px 0 18px;
}

.eyebrow {
    margin: 0 0 6px;
    color: var(--teal);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

h1,
h2 {
    margin: 0;
    letter-spacing: 0;
}

h1 {
    font-size: clamp(32px, 5vw, 58px);
    line-height: 1;
}

h2 {
    font-size: 18px;
}

.topbar-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.primary-button,
.secondary-button,
input,
select {
    min-height: 42px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font: inherit;
}

.primary-button {
    border-color: var(--navy);
    background: var(--navy);
    color: white;
    padding: 0 18px;
    font-weight: 800;
    cursor: pointer;
}

.secondary-button {
    border-color: var(--teal);
    background: #f0f8f7;
    color: var(--teal);
    padding: 0 18px;
    font-weight: 800;
    cursor: pointer;
}

.logout-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.primary-button[disabled],
.secondary-button[disabled] {
    cursor: wait;
    opacity: .72;
}

.login-shell {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 24px;
}

.login-panel {
    width: min(420px, 100%);
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: 0 12px 28px rgba(31, 42, 54, .07);
}

.login-form {
    display: grid;
    gap: 12px;
    margin-top: 24px;
}

.login-form label {
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
}

.login-error {
    margin: 0;
    color: var(--red);
    font-weight: 800;
}

.kpis {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: 8px 0 18px;
}

.kpis article,
.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(31, 42, 54, .07);
}

.kpis article {
    padding: 18px;
}

.kpis span,
.panel-head span {
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.kpis strong {
    display: block;
    margin-top: 10px;
    font-size: 28px;
    line-height: 1.1;
}

.period-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin: 0 0 18px;
    padding: 6px;
    background: #dfe6ee;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.period-tab {
    min-height: 42px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    font: inherit;
    font-weight: 900;
    cursor: pointer;
}

.period-tab.active {
    background: #fff;
    color: var(--navy);
    box-shadow: 0 6px 16px rgba(31, 42, 54, .09);
}

.grid {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 18px;
    margin-bottom: 18px;
}

.panel {
    padding: 18px;
    margin-bottom: 18px;
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.chart-panel canvas {
    width: 100%;
    max-height: 260px;
}

.chart-legend {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin: 8px 0 12px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.chart-legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.good {
    background: var(--green);
}

.legend-dot.okay {
    background: var(--gold);
}

.legend-dot.weak {
    background: var(--red);
}

.legend-line {
    width: 24px;
    height: 0;
    border-top: 2px dashed var(--muted);
}

.development-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.development-points li {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 8px;
    align-items: center;
    padding: 9px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fbfcfd;
}

.development-points li.bad-grade-box {
    border: 2px solid #b64242;
    background: #fff7f7;
}

.development-points span {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.development-points b {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
}

.development-points strong {
    font-size: 22px;
    line-height: 1;
}

.development-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 12px;
}

.development-summary article {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fbfcfd;
    padding: 12px;
}

.development-summary span {
    display: block;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.development-summary strong {
    display: block;
    margin-top: 4px;
    font-size: 20px;
}

.subjects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 10px;
}

.subject-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fbfcfd;
    overflow: hidden;
}

.subject-card.bad-grade-card {
    border: 2px solid #b64242;
    box-shadow: 0 0 0 2px rgba(182, 66, 66, 0.12);
}

.subject-card.expanded {
    grid-column: span 2;
}

.subject-toggle {
    width: 100%;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font: inherit;
    padding: 14px;
    text-align: left;
}

.subject-card header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.subject-card b {
    font-size: 16px;
}

.subject-name {
    display: block;
    min-width: 0;
    overflow-wrap: anywhere;
}

.badge {
    display: inline-flex;
    min-width: 42px;
    height: 32px;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--navy);
    color: white;
    font-weight: 900;
}

.badge.bad-grade-badge {
    background: #b64242;
}

.subject-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 12px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.subject-insight {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 12px;
}

.subject-insight span,
.subject-averages span {
    display: block;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.subject-insight strong,
.subject-averages strong {
    display: block;
    margin-top: 3px;
    font-size: 18px;
}

.subject-averages {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 12px;
}

.subject-averages div {
    min-width: 0;
    padding: 9px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.subject-averages div.bad-grade-box {
    border: 2px solid #b64242;
    background: #fff7f7;
}

.subject-averages strong {
    font-size: 16px;
}

.subject-grades {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0 14px 14px;
    list-style: none;
}

.subject-grade {
    display: grid;
    grid-template-columns: 84px 1fr;
    gap: 10px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.subject-grade.bad-grade-box {
    border: 2px solid #b64242;
    background: #fff7f7;
}

.subject-grade-main strong,
.subject-grade-main span,
.subject-grade-text b,
.subject-grade-text span,
.subject-grade-text small {
    display: block;
}

.subject-grade-main strong {
    margin-top: 4px;
    font-size: 24px;
    line-height: 1;
}

.subject-grade-date,
.subject-grade-text span,
.subject-grade-text small {
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.subject-grade-text {
    min-width: 0;
}

.subject-grade-text b {
    margin-bottom: 3px;
}

.subject-grade-text small {
    margin-top: 6px;
    overflow-wrap: anywhere;
}

.trend-up {
    color: var(--green);
}

.trend-down {
    color: var(--red);
}

.trend-flat {
    color: var(--gold);
}

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

input,
select {
    background: #fff;
    color: var(--ink);
    padding: 0 12px;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}

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

th {
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0;
}

td.grade-cell {
    font-weight: 900;
}

td.grade-cell.bad-grade-cell {
    border: 2px solid #b64242;
    background: #fff7f7;
    color: #8f2f2f;
}

.empty {
    color: var(--muted);
    padding: 28px 0;
    text-align: center;
}

@media (max-width: 860px) {
    .topbar,
    .panel-head {
        align-items: stretch;
        flex-direction: column;
    }

    .kpis,
    .grid,
    .development-summary {
        grid-template-columns: 1fr;
    }

    .filters,
    .period-tabs,
    .topbar-actions,
    .primary-button,
    .secondary-button,
    input,
    select {
        width: 100%;
    }

    .subject-card.expanded {
        grid-column: span 1;
    }

    .subject-grade {
        grid-template-columns: 74px 1fr;
    }

    .subject-averages {
        grid-template-columns: 1fr;
    }

    .development-points {
        grid-template-columns: 1fr;
    }
}