.admin-tails-view-tabs {
    display: inline-flex;
    gap: 4px;
    max-width: 100%;
    margin: 0 0 16px;
    padding: 4px;
    border: 1px solid var(--skin-border, #cbd5e1);
    border-radius: 12px;
    background: var(--skin-surface-1, #f1f5f9);
}
.admin-tails-view-tabs button {
    min-height: 42px;
    padding: 8px 18px;
    border: 1px solid transparent;
    border-radius: 9px;
    color: var(--skin-text-muted, #475569);
    background: transparent;
    box-shadow: none;
    font: inherit;
    font-weight: 750;
    cursor: pointer;
}

.admin-tails-view-tabs button.is-active {
    border-color: var(--skin-border-active, #0891b2);
    color: var(--skin-text, #0f172a);
    background: var(--skin-energy-soft, #cffafe);
}

.admin-tails-view-tabs button:focus-visible,
.student-dynamics button:focus-visible,
.student-dynamics select:focus-visible,
.student-dynamics [data-dynamics-point]:focus-visible {
    outline: 3px solid var(--skin-focus, #facc15);
    outline-offset: 3px;
}

.student-dynamics {
    --sd-time: var(--skin-energy, #22d3ee);
    --sd-wrong: #a866ff;
    --sd-success: var(--skin-success, #15803d);
    --sd-critical: var(--skin-danger, #dc2626);
    min-width: 0;
    padding: 20px;
    border: 1px solid var(--skin-border, #cbd5e1);
    border-radius: 14px;
    color: var(--skin-text, #0f172a);
    background:
        linear-gradient(145deg, rgba(85, 239, 255, .045), transparent 34%),
        var(--skin-graphite-grain, #ffffff);
    box-shadow: var(--skin-shell-shadow, 0 12px 28px rgba(15, 23, 42, .08));
}

.student-dynamics__header,
.student-dynamics__toolbar,
.student-dynamics__chart-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.student-dynamics__header h2 {
    margin: 2px 0 0;
    font-size: clamp(1.25rem, 2.2vw, 1.7rem);
}

.student-dynamics__title-cluster {
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 12px 20px;
    width: 100%;
    min-width: 0;
}

.student-dynamics__eyebrow {
    margin: 0;
    color: var(--skin-energy, #0891b2);
    font-size: .72rem;
    font-weight: 850;
    letter-spacing: .14em;
    text-transform: uppercase;
}

.student-dynamics__theme-label {
    display: grid;
    flex: 0 1 430px;
    gap: 6px;
    width: min(430px, 100%);
    min-width: 0;
    color: var(--skin-text-muted, #475569);
    font-size: .78rem;
    font-weight: 750;
}

.student-dynamics select {
    width: 100%;
    min-height: 44px;
    padding: 8px 38px 8px 12px;
    border: 1px solid var(--skin-line-bright, #94a3b8);
    border-radius: 9px;
    color: var(--skin-text, #0f172a);
    background: var(--skin-control-background, #fff);
    font: inherit;
}

.student-dynamics__toolbar {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--skin-border, #cbd5e1);
}

.student-dynamics__filters {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.student-dynamics__filters button {
    min-height: 42px;
    padding: 8px 14px;
    border: 1px solid var(--skin-border, #cbd5e1);
    border-radius: 999px;
    color: var(--skin-text-muted, #475569);
    background: var(--skin-surface-2, #fff);
    box-shadow: none;
    font: inherit;
    font-weight: 720;
    cursor: pointer;
}

.student-dynamics__filters button.is-active {
    border-color: var(--skin-border-active, #0891b2);
    color: var(--skin-text, #0f172a);
    background: var(--skin-energy-soft, #ecfeff);
}

.student-dynamics__legend {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    color: var(--skin-text-muted, #64748b);
    font-size: .82rem;
}

.student-dynamics__legend span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.student-dynamics__legend i {
    display: inline-block;
    width: 10px;
    height: 10px;
}

.student-dynamics__legend-time {
    border: 2px solid var(--sd-time);
    border-radius: 50%;
}

.student-dynamics__legend-wrong {
    border: 2px solid var(--sd-wrong);
    transform: rotate(45deg);
}

.student-dynamics__state {
    min-height: 84px;
    margin-top: 18px;
    padding: 28px 18px;
    border: 1px dashed var(--skin-border, #cbd5e1);
    border-radius: 10px;
    color: var(--skin-text-muted, #64748b);
    text-align: center;
}

.student-dynamics__state.is-error {
    border-color: var(--sd-critical);
    color: var(--sd-critical);
}

.student-dynamics__chart-card {
    min-width: 0;
    margin-top: 18px;
    overflow: hidden;
    border: 1px solid var(--skin-border, #cbd5e1);
    border-radius: 12px;
    background: var(--skin-surface-1, #fff);
}

.student-dynamics__chart-heading {
    min-height: 55px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--skin-border, #cbd5e1);
}

.student-dynamics__chart-heading span {
    color: var(--skin-text-muted, #64748b);
    font-size: .82rem;
}

.student-dynamics__scroll {
    position: relative;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    overscroll-behavior-x: contain;
    scrollbar-color: var(--skin-line-bright, #94a3b8) transparent;
}

.student-dynamics svg {
    display: block;
    max-width: none;
    min-height: 400px;
    color: var(--skin-text-muted, #64748b);
}

.sd-band--better {
    fill: rgba(85, 239, 255, .035);
}

.sd-band--worse {
    fill: rgba(255, 119, 135, .025);
}

.sd-grid {
    stroke: var(--skin-line, rgba(100, 116, 139, .2));
    stroke-width: 1;
}

.sd-grid--norm {
    stroke: var(--skin-line-bright, rgba(100, 116, 139, .5));
    stroke-dasharray: 5 5;
}

.sd-axis-label,
.sd-task-label,
.sd-unresolved-heading {
    fill: currentColor;
    font-family: inherit;
}

.sd-axis-label {
    font-size: 11px;
    font-weight: 650;
}

.sd-task-label {
    font-size: 12px;
    font-weight: 750;
}

.sd-task-label--unresolved,
.sd-unresolved-heading {
    fill: var(--skin-text-dim, #94a3b8);
}

.sd-unresolved-heading {
    font-size: 10px;
    font-weight: 850;
    letter-spacing: .12em;
}

.sd-unresolved-zone {
    fill: rgba(113, 129, 145, .06);
    stroke: var(--skin-line, rgba(100, 116, 139, .2));
    stroke-dasharray: 3 5;
}

.sd-divider {
    stroke: var(--skin-line-bright, #64748b);
    stroke-width: 1.5;
    stroke-dasharray: 3 5;
}

.sd-metric-path {
    fill: none;
    stroke-width: 2.2;
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}

.sd-metric-path--time {
    stroke: var(--sd-time);
}

.sd-metric-path--wrong {
    stroke: var(--sd-wrong);
}

.sd-marker {
    vector-effect: non-scaling-stroke;
}

.sd-marker--time {
    stroke: var(--sd-time);
    stroke-width: 2;
}

.sd-marker--wrong {
    stroke: var(--sd-wrong);
    stroke-width: 1.8;
}

.sd-marker.is-on-lesson.sd-marker--time {
    fill: var(--sd-time);
}

.sd-marker.is-on-lesson.sd-marker--wrong {
    fill: var(--sd-wrong);
}

.sd-marker.is-self {
    fill: var(--skin-surface-1, #fff);
}

.sd-marker.is-unknown {
    fill: var(--skin-text-dim, #94a3b8);
    fill-opacity: 0.18;
    stroke-dasharray: 2 2;
    opacity: 0.82;
}

.sd-hit-area {
    fill: transparent;
    pointer-events: all;
}

.sd-unresolved-marker {
    fill: var(--skin-surface-1, #fff);
    stroke: var(--skin-text-dim, #94a3b8);
    stroke-width: 1.5;
    vector-effect: non-scaling-stroke;
}

.student-dynamics__tooltip {
    position: absolute;
    z-index: 3;
    width: 224px;
    padding: 12px 14px;
    border: 1px solid var(--skin-line-bright, #94a3b8);
    border-radius: 10px;
    color: var(--skin-text, #0f172a);
    background: var(--skin-surface-3, #fff);
    box-shadow: 0 14px 32px rgba(0, 0, 0, .28);
    pointer-events: none;
}

.student-dynamics__tooltip strong,
.sd-tooltip-row {
    display: block;
}

.student-dynamics__tooltip strong {
    margin-bottom: 8px;
    font-size: .92rem;
}

.sd-tooltip-row {
    margin-top: 4px;
    color: var(--skin-text-muted, #475569);
    font-size: .84rem;
}

.sd-tooltip-value {
    color: inherit;
    font-weight: 850;
}

.sd-tooltip-value.is-critical {
    color: var(--sd-critical);
}

.sd-tooltip-value.is-success,
.sd-tooltip-row--success {
    color: var(--sd-success);
}

.sd-tooltip-value.is-neutral,
.sd-tooltip-reference {
    color: var(--skin-text-muted, #64748b);
}

.student-dynamics__note {
    margin: 0;
    padding: 10px 16px 13px;
    color: var(--skin-text-muted, #64748b);
    font-size: .78rem;
}

@media (max-width: 820px) {
    .student-dynamics {
        padding: 16px;
    }

    .student-dynamics__header,
    .student-dynamics__toolbar {
        align-items: stretch;
        flex-direction: column;
    }

    .student-dynamics__title-cluster {
        align-items: stretch;
        flex-direction: column;
    }

    .student-dynamics__theme-label {
        width: 100%;
    }

    .student-dynamics__legend {
        padding-left: 2px;
    }
}

@media (max-width: 520px) {
    .admin-tails-view-tabs,
    .student-dynamics__filters {
        display: grid;
        width: 100%;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .student-dynamics {
        padding: 12px;
        border-radius: 11px;
    }

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

    .student-dynamics__filters button,
    .admin-tails-view-tabs button {
        min-height: 44px;
        padding-inline: 9px;
    }

    .student-dynamics__chart-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .student-dynamics *,
    .admin-tails-view-tabs * {
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media (forced-colors: active) {
    .student-dynamics,
    .student-dynamics__chart-card,
    .admin-tails-view-tabs {
        border: 1px solid CanvasText;
        forced-color-adjust: auto;
    }

    .sd-metric-path--time,
    .sd-marker--time {
        stroke: Highlight;
    }

    .sd-metric-path--wrong,
    .sd-marker--wrong {
        stroke: LinkText;
    }
}