.stats-page {
    width: min(100%, 1120px);
    margin: 0 auto;
    padding-bottom: 28px;
}

.stats-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 24px;
}

.stats-header h1 {
    margin: 7px 0 5px;
    font-size: clamp(1.8rem, 4vw, 2.55rem);
    letter-spacing: -.04em;
}

.stats-header p {
    max-width: 650px;
    margin: 0;
    color: var(--color-text-secondary);
}

.stats-period {
    display: flex;
    flex: 0 0 auto;
    gap: 4px;
    padding: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.stats-period button {
    min-height: 35px;
    padding: 6px 11px;
    color: var(--color-text-muted);
    background: transparent;
    border-radius: 9px;
    cursor: pointer;
    font-size: .75rem;
    font-weight: 700;
}

.stats-period button:hover { color: var(--color-text); }
.stats-period button.active { color: #fff; background: var(--color-primary); box-shadow: 0 5px 16px rgba(124, 92, 255, .25); }

.stats-summary-grid {
    display: grid;
    grid-template-columns: minmax(280px, 1.45fr) repeat(4, minmax(135px, .75fr));
    gap: 11px;
}

.stats-accuracy-card,
.stats-kpi,
.stats-panel,
.stats-resume-banner {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.stats-accuracy-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px;
    background:
        radial-gradient(circle at 0 0, rgba(124, 92, 255, .12), transparent 45%),
        var(--color-surface);
}

.stats-accuracy-ring {
    --ring-color: var(--color-primary);
    width: 92px;
    height: 92px;
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    background: conic-gradient(var(--ring-color) var(--accuracy), var(--color-surface-secondary) 0);
    border-radius: 50%;
}

.stats-accuracy-ring.tone-high { --ring-color: var(--color-success); }
.stats-accuracy-ring.tone-medium { --ring-color: var(--color-warning); }
.stats-accuracy-ring.tone-low { --ring-color: var(--color-danger); }
.stats-accuracy-ring::before { content: ''; grid-area: 1 / 1; width: 72px; height: 72px; background: var(--color-surface); border-radius: 50%; }
.stats-accuracy-ring > div { grid-area: 1 / 1; z-index: 1; display: flex; flex-direction: column; text-align: center; }
.stats-accuracy-ring strong { font-size: 1.25rem; }
.stats-accuracy-ring span { color: var(--color-text-muted); font-size: .62rem; }
.stats-accuracy-card > div:last-child { display: flex; min-width: 0; flex-direction: column; }
.stats-accuracy-card > div:last-child > span { color: var(--color-text-muted); font-size: .7rem; }
.stats-accuracy-card > div:last-child > strong { margin: 3px 0 5px; font-size: .9rem; }
.stats-accuracy-card small { color: var(--color-success); font-size: .66rem; line-height: 1.35; }
.stats-accuracy-card small.negative { color: var(--color-danger); }

.stats-kpi {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 130px;
    padding: 17px;
}

.stats-kpi > span {
    width: 35px;
    height: 35px;
    display: grid;
    place-items: center;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    border-radius: 10px;
}

.stats-kpi > span .ui-icon { width: 18px; height: 18px; }
.stats-kpi > div { display: flex; flex-direction: column; }
.stats-kpi strong { font-size: 1.45rem; line-height: 1; }
.stats-kpi small { margin-top: 5px; color: var(--color-text-muted); font-size: .67rem; line-height: 1.25; }

.stats-resume-banner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
    padding: 13px 16px;
    color: var(--color-text);
    background: linear-gradient(90deg, rgba(124, 92, 255, .12), var(--color-surface));
    border-color: var(--color-primary-border);
}

.stats-resume-banner > span { width: 35px; height: 35px; display: grid; place-items: center; color: var(--color-primary); background: var(--color-primary-soft); border-radius: 10px; }
.stats-resume-banner > span .ui-icon, .stats-resume-banner > .ui-icon { width: 18px; height: 18px; }
.stats-resume-banner > div { display: flex; flex-direction: column; }
.stats-resume-banner small { margin-top: 2px; color: var(--color-text-muted); font-size: .72rem; }
.stats-resume-banner:hover { border-color: var(--color-primary); }

.stats-panel {
    margin-top: 14px;
    padding: 21px;
}

.stats-panel__heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.stats-panel__heading > div { display: flex; align-items: flex-start; gap: 11px; }
.stats-panel__heading h2 { margin: 1px 0 2px; font-size: .98rem; }
.stats-panel__heading p { margin: 0; color: var(--color-text-muted); font-size: .72rem; }
.stats-panel__heading > a { color: var(--color-primary); font-size: .75rem; font-weight: 750; }
.stats-panel__icon { width: 36px; height: 36px; display: grid; place-items: center; flex: 0 0 auto; color: var(--color-primary); background: var(--color-primary-soft); border-radius: 10px; }
.stats-panel__icon .ui-icon { width: 18px; height: 18px; }
.stats-panel__icon--warning { color: var(--color-warning); background: rgba(245, 185, 76, .1); }

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

.stats-chart-wrap { overflow: hidden; }
.stats-chart { display: block; width: 100%; height: auto; overflow: visible; }
.stats-chart text { fill: var(--color-text-muted); font-size: 10px; }
.stats-chart__grid { stroke: var(--color-border); stroke-width: 1; stroke-dasharray: 4 5; }
.stats-chart__bar { fill: rgba(124, 92, 255, .22); }
.stats-chart__bar:hover { fill: rgba(124, 92, 255, .42); }
.stats-chart__line { fill: none; stroke: #68c9ff; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 2px 7px rgba(104, 201, 255, .25)); }
.stats-chart__point { fill: var(--color-background); stroke: #68c9ff; stroke-width: 2.5; }
.stats-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; color: var(--color-text-muted); font-size: .66rem; }
.stats-chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.stats-chart-legend i { width: 16px; display: block; }
.stats-chart-legend__bar { height: 7px; background: rgba(124, 92, 255, .35); border-radius: 2px; }
.stats-chart-legend__line { height: 2px; background: #68c9ff; }

.stats-chart-empty {
    min-height: 220px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 25px;
    color: var(--color-text-muted);
    text-align: center;
    background: var(--color-surface-secondary);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
}

.stats-chart-empty .ui-icon { width: 27px; height: 27px; margin-bottom: 10px; color: var(--color-primary); }
.stats-chart-empty strong { color: var(--color-text-secondary); }
.stats-chart-empty span { margin-top: 4px; font-size: .75rem; }

.stats-performance-list { display: grid; gap: 16px; }
.stats-performance-row { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 11px; align-items: start; }
.stats-performance-row__icon { width: 33px; height: 33px; display: grid; place-items: center; color: var(--color-text-muted); background: var(--color-surface-secondary); border-radius: 9px; }
.stats-performance-row__icon .ui-icon { width: 16px; height: 16px; }
.stats-performance-row__heading { display: flex; justify-content: space-between; gap: 10px; font-size: .78rem; }
.stats-performance-row__heading span { color: var(--color-text-secondary); font-weight: 750; }
.stats-performance-row__track { height: 6px; overflow: hidden; margin: 7px 0 4px; background: var(--color-surface-secondary); border-radius: var(--radius-pill); }
.stats-performance-row__track i { display: block; height: 100%; min-width: 2px; border-radius: inherit; }
.stats-performance-row small { color: var(--color-text-muted); font-size: .65rem; }

.tone-high { color: var(--color-success) !important; }
.tone-medium { color: var(--color-warning) !important; }
.tone-low { color: var(--color-danger) !important; }
.stats-performance-row__track .tone-high { background: var(--color-success); }
.stats-performance-row__track .tone-medium { background: var(--color-warning); }
.stats-performance-row__track .tone-low { background: var(--color-danger); }

.stats-classroom-list,
.stats-weak-list,
.stats-recent-list { display: grid; gap: 8px; }

.stats-classroom-row,
.stats-recent-row {
    display: grid;
    align-items: center;
    gap: 11px;
    padding: 11px;
    color: var(--color-text);
    background: var(--color-surface-secondary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
}

.stats-classroom-row { grid-template-columns: auto minmax(0, 1fr) auto; }
.stats-classroom-row > span { width: 32px; height: 32px; display: grid; place-items: center; color: var(--color-primary); background: var(--color-primary-soft); border-radius: 9px; }
.stats-classroom-row > span .ui-icon { width: 16px; height: 16px; }
.stats-classroom-row > div:nth-child(2), .stats-recent-row > div { display: flex; min-width: 0; flex-direction: column; }
.stats-classroom-row strong, .stats-recent-row strong { overflow: hidden; font-size: .78rem; text-overflow: ellipsis; white-space: nowrap; }
.stats-classroom-row small, .stats-recent-row small { overflow: hidden; margin-top: 2px; color: var(--color-text-muted); font-size: .64rem; text-overflow: ellipsis; white-space: nowrap; }
.stats-classroom-row:hover, .stats-recent-row:hover { border-color: var(--color-border-hover); }
.stats-classroom-score { min-width: 43px; text-align: right; font-size: .8rem; font-weight: 800; }

.stats-weak-row { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 10px; padding: 11px; background: var(--color-surface-secondary); border-radius: var(--radius-md); }
.stats-weak-row > span { width: 26px; height: 26px; display: grid; place-items: center; color: var(--color-warning); background: rgba(245, 185, 76, .1); border-radius: 8px; font-size: .68rem; font-weight: 800; }
.stats-weak-row > div { display: flex; min-width: 0; flex-direction: column; }
.stats-weak-row strong { overflow: hidden; font-size: .77rem; text-overflow: ellipsis; white-space: nowrap; }
.stats-weak-row small { margin-top: 2px; color: var(--color-text-muted); font-size: .64rem; }
.stats-weak-row b { font-size: .8rem; }

.stats-recent-row { grid-template-columns: auto minmax(0, 1fr) auto; }
.stats-recent-row > .ui-icon { width: 17px; height: 17px; color: var(--color-text-muted); }
.stats-recent-score { width: 47px; height: 47px; display: grid; place-items: center; background: var(--color-surface); border: 1px solid currentColor; border-radius: 13px; font-size: .75rem; font-weight: 850; }

.stats-inline-empty { min-height: 120px; display: grid; place-items: center; padding: 20px; color: var(--color-text-muted); text-align: center; background: var(--color-surface-secondary); border-radius: var(--radius-md); font-size: .74rem; }

@media (max-width: 1050px) {
    .stats-summary-grid { grid-template-columns: repeat(4, 1fr); }
    .stats-accuracy-card { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
    .stats-header { align-items: stretch; flex-direction: column; }
    .stats-period { width: 100%; }
    .stats-period button { flex: 1; }
    .stats-summary-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-accuracy-card { grid-column: 1 / -1; }
    .stats-kpi { min-height: 115px; }
    .stats-two-columns { grid-template-columns: 1fr; gap: 0; }
    .stats-panel { padding: 17px; }
    .stats-activity-panel { padding-inline: 10px; }
    .stats-activity-panel .stats-panel__heading { padding-inline: 7px; }
    .stats-chart { min-width: 0; }
    .stats-chart text { font-size: 18px; }
    .stats-chart__grid { stroke-width: 2; }
    .stats-chart__line { stroke-width: 5; }
    .stats-chart__point { r: 6px; stroke-width: 4; }
    .stats-chart-wrap { overflow: hidden; padding-bottom: 7px; }
}

@media (max-width: 430px) {
    .stats-accuracy-card { align-items: flex-start; }
    .stats-accuracy-ring { width: 82px; height: 82px; }
    .stats-accuracy-ring::before { width: 64px; height: 64px; }
    .stats-kpi { padding: 14px; }
    .stats-kpi strong { font-size: 1.25rem; }
    .stats-panel__heading { flex-direction: column; }
    .stats-panel__heading--link { flex-direction: row; }
    .stats-resume-banner small { line-height: 1.35; }
}

@media (prefers-reduced-motion: reduce) {
    .stats-period button,
    .stats-classroom-row,
    .stats-recent-row { transition: none; }
}