:root {
    --school-ink: #17212b;
    --school-muted: #5c6976;
    --school-line: #d9e1ea;
    --school-paper: #ffffff;
    --school-bg: #f4f7f6;
    --school-navy: #1f3a5f;
    --school-table-header: #1f3a5f;
    --school-table-header-border: #1f3a5f;
    --school-green: #2f7d57;
    --school-green-dark: #245f43;
    --school-gold: #c7972f;
    --school-red: #b9413f;
    --school-blue: #2f67b1;
    --school-sky: #e9f1fb;
    --school-mint: #e8f4ed;
    --school-cream: #fff9ed;
    --school-shadow: 0 10px 26px rgba(31, 58, 95, 0.08);
    --school-body-start: rgba(233, 241, 251, 0.78);
    --school-body-end: rgba(244, 247, 246, 0.95);
    --school-control-bg: #ffffff;
    --school-control-readonly: #f7fafc;
    --school-hover: rgba(233, 241, 251, 0.58);
    --school-alert-info-bg: #e8f3fb;
    --school-alert-info-border: #b8d8ee;
    --school-alert-success-bg: #e8f4ed;
    --school-alert-success-border: #b8d9c7;
    --school-alert-warning-bg: #fff5df;
    --school-alert-warning-border: #e8c978;
    --school-alert-danger-bg: #fdeceb;
    --school-alert-danger-border: #efb8b6;
    --school-radius: 8px;

    /* Chalkboard surfaces stay familiar while their shell and controls adapt to the active theme. */
    --chalkboard-panel-start: #f5fbf7;
    --chalkboard-panel-end: #e5f3ea;
    --chalkboard-panel-accent: rgba(47, 125, 87, 0.12);
    --chalkboard-panel-border: rgba(47, 125, 87, 0.34);
    --chalkboard-panel-text: #173f35;
    --chalkboard-panel-muted: #4d6b5f;
    --chalkboard-panel-shadow: 0 18px 42px rgba(31, 58, 47, 0.14), inset 0 0 0 1px rgba(255, 255, 255, 0.72);
    --chalkboard-surface-start: #174d40;
    --chalkboard-surface-end: #103a31;
    --chalkboard-surface-text: #f7fff5;
    --chalkboard-surface-muted: rgba(247, 255, 245, 0.74);
    --chalkboard-surface-border: rgba(47, 125, 87, 0.48);
    --chalkboard-surface-frame: #8a6034;
    --chalkboard-surface-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08), inset 0 14px 28px rgba(3, 18, 15, 0.2);
    --chalkboard-heading: #fffdf2;
    --chalkboard-link: #d6eaff;
    --chalkboard-rule: rgba(247, 255, 245, 0.4);
    --chalkboard-table-border: rgba(247, 255, 245, 0.34);
    --chalkboard-table-heading: rgba(247, 255, 245, 0.1);
    --chalkboard-callout: rgba(111, 207, 151, 0.13);
    --chalkboard-code-bg: rgba(3, 12, 20, 0.68);
    --chalkboard-code-text: #e5f7ff;
    --chalkboard-code-border: rgba(247, 255, 245, 0.22);
    --chalkboard-toolbar-bg: rgba(13, 32, 49, 0.98);
    --chalkboard-toolbar-surface: rgba(4, 18, 30, 0.92);
    --chalkboard-toolbar-text: #f7fff5;
    --chalkboard-toolbar-muted: rgba(232, 255, 240, 0.72);
    --chalkboard-toolbar-border: rgba(151, 236, 183, 0.3);
    --chalkboard-toolbar-hover: rgba(31, 86, 70, 0.98);
    --chalkboard-action-bg: rgba(47, 125, 87, 0.09);
    --chalkboard-action-border: rgba(47, 125, 87, 0.48);
    --chalkboard-action-text: #1f6145;
    --chalkboard-action-hover-bg: #2f7d57;
    --chalkboard-action-hover-text: #ffffff;
    --chalkboard-status-saving-bg: rgba(199, 151, 47, 0.13);
    --chalkboard-status-saving-border: rgba(157, 107, 14, 0.48);
    --chalkboard-status-saving-text: #744b08;
    --chalkboard-status-saved-bg: rgba(47, 125, 87, 0.12);
    --chalkboard-status-saved-border: rgba(47, 125, 87, 0.46);
    --chalkboard-status-saved-text: #1f6145;
    --chalkboard-status-warning-bg: rgba(185, 65, 63, 0.1);
    --chalkboard-status-warning-border: rgba(185, 65, 63, 0.44);
    --chalkboard-status-warning-text: #9d302f;

    --primary-color: var(--school-green);
    --accent-color: var(--school-gold);
    --danger-color: var(--school-red);
    --text-color: var(--school-ink);
    --bg-color: var(--school-bg);
}

/* Privacy-conscious videos saved inside Xtra Classes chalkboards. */
.xtra-chalkboard-video {
    box-sizing: border-box;
    display: block;
    width: 70%;
    min-width: min(200px, 100%);
    max-width: 100%;
    margin: 0.85rem auto;
    clear: both;
}

.xtra-chalkboard-video-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.55);
    border-radius: 0.65rem;
    background: #020617;
    box-shadow: 0 0.5rem 1.25rem rgba(2, 6, 23, 0.24);
}

.xtra-chalkboard-video-frame iframe,
.xtra-chalkboard-video-frame > video {
    position: absolute;
    inset: 0;
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
}

.xtra-chalkboard-video-frame > video {
    object-fit: contain;
}

.xtra-chalkboard-video-frame.has-youtube-poster iframe {
    visibility: hidden;
}

.xtra-chalkboard-video-play {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: grid;
    place-items: center;
    width: 100%;
    height: 100%;
    padding: 0;
    overflow: hidden;
    border: 0;
    color: #ffffff;
    background: #020617;
    cursor: pointer;
    appearance: none;
}

.xtra-chalkboard-video-play::after {
    position: absolute;
    inset: 0;
    content: '';
    background: linear-gradient(180deg, rgba(2, 6, 23, 0.08), rgba(2, 6, 23, 0.62));
}

.xtra-chalkboard-video-play-thumbnail {
    position: absolute;
    inset: 0;
    width: 100% !important;
    max-width: none !important;
    height: 100% !important;
    margin: 0 !important;
    object-fit: cover;
}

.xtra-chalkboard-video-play-mark {
    position: relative;
    z-index: 1;
    display: grid;
    place-items: center;
    width: clamp(3.4rem, 12%, 5rem);
    aspect-ratio: 1;
    padding-left: 0.25rem;
    border: 2px solid rgba(255, 255, 255, 0.88);
    border-radius: 999px;
    background: rgba(180, 35, 24, 0.94);
    box-shadow: 0 0.7rem 1.8rem rgba(2, 6, 23, 0.42);
    font-size: clamp(1.25rem, 4vw, 2rem);
    line-height: 1;
    transition: transform 160ms ease, background-color 160ms ease;
}

.xtra-chalkboard-video-play-label {
    position: absolute;
    z-index: 1;
    bottom: 0.8rem;
    left: 50%;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    background: rgba(2, 6, 23, 0.78);
    font-size: 0.82rem;
    font-weight: 800;
    line-height: 1.2;
    transform: translateX(-50%);
}

.xtra-chalkboard-video-play:hover .xtra-chalkboard-video-play-mark,
.xtra-chalkboard-video-play:focus-visible .xtra-chalkboard-video-play-mark {
    background: #dc2626;
    transform: scale(1.07);
}

.xtra-chalkboard-video-play:focus-visible {
    outline: 3px solid #93c5fd;
    outline-offset: -3px;
}

.xtra-chalkboard-video-playback-help {
    display: block;
    margin-top: 0.4rem;
    color: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    text-align: right;
    text-decoration: underline;
    text-underline-offset: 0.16rem;
}

.xtra-chalkboard-video-error {
    position: absolute;
    inset: 0;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    padding: clamp(1rem, 4vw, 2rem);
    color: #f8fafc;
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.98), rgba(30, 41, 59, 0.98));
    text-align: center;
}

.xtra-chalkboard-video-error strong {
    color: #fecaca;
    font-size: clamp(1rem, 2.3vw, 1.3rem);
}

.xtra-chalkboard-video-error span {
    max-width: 42rem;
    color: #e2e8f0;
    font-size: clamp(0.78rem, 1.8vw, 0.95rem);
    line-height: 1.45;
}

.xtra-chalkboard-video-error a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.4rem;
    padding: 0.45rem 0.8rem;
    border: 1px solid #86efac;
    border-radius: 0.5rem;
    color: #dcfce7 !important;
    background: rgba(22, 101, 52, 0.36);
    font-weight: 750;
    text-decoration: none !important;
}

.xtra-chalkboard-video-error a:hover,
.xtra-chalkboard-video-error a:focus-visible {
    background: rgba(22, 101, 52, 0.65);
    outline: 2px solid #bbf7d0;
    outline-offset: 2px;
}

.xtra-chalkboard-video-link-card {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 1.25rem;
    background: linear-gradient(145deg, #0f172a, #1e293b);
    text-align: center;
}

.xtra-chalkboard-video-external-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    padding: 0.65rem 1rem;
    border: 1px solid #86efac;
    border-radius: 0.55rem;
    color: #dcfce7 !important;
    background: rgba(22, 101, 52, 0.34);
    font-weight: 750;
    text-decoration: none !important;
}

.xtra-chalkboard-video-external-link:hover,
.xtra-chalkboard-video-external-link:focus-visible {
    background: rgba(22, 101, 52, 0.62);
    outline: 2px solid #bbf7d0;
    outline-offset: 2px;
}

.xtra-chalkboard-video-print {
    display: none;
}

/* Generated mathematics stays editable while important relationships read like board notation. */
.chalkboard-rich-editor .xtra-chalkboard-formula,
.chalkboard-rich-editor .xtra-chalkboard-worked-equation,
.chalkboard-view .xtra-chalkboard-formula,
.chalkboard-view .xtra-chalkboard-worked-equation,
.xtra-board-rich-editor .xtra-chalkboard-formula,
.xtra-board-rich-editor .xtra-chalkboard-worked-equation {
    box-sizing: border-box;
    width: fit-content;
    max-width: 100%;
    margin: 0.9rem auto;
    color: var(--chalkboard-heading);
    text-align: center;
    break-inside: avoid;
}

.chalkboard-rich-editor .xtra-chalkboard-formula,
.chalkboard-view .xtra-chalkboard-formula,
.xtra-board-rich-editor .xtra-chalkboard-formula {
    padding: 0.72rem 1rem;
    border: 1px solid rgba(255, 253, 242, 0.58);
    border: 1px solid color-mix(in srgb, var(--chalkboard-heading) 58%, transparent);
    border-left: 4px solid var(--school-gold);
    border-radius: 0.55rem;
    background: rgba(255, 253, 242, 0.08);
    background: color-mix(in srgb, var(--chalkboard-heading) 8%, transparent);
    box-shadow: 0 0.35rem 0.9rem rgba(2, 18, 14, 0.16);
}

.chalkboard-rich-editor .xtra-chalkboard-worked-equation,
.chalkboard-view .xtra-chalkboard-worked-equation,
.xtra-board-rich-editor .xtra-chalkboard-worked-equation {
    padding: 0.45rem 0.9rem 0.6rem;
    border-bottom: 2px solid var(--chalkboard-rule);
}

.chalkboard-rich-editor .xtra-chalkboard-formula > strong,
.chalkboard-rich-editor .xtra-chalkboard-worked-equation > strong,
.chalkboard-view .xtra-chalkboard-formula > strong,
.chalkboard-view .xtra-chalkboard-worked-equation > strong,
.xtra-board-rich-editor .xtra-chalkboard-formula > strong,
.xtra-board-rich-editor .xtra-chalkboard-worked-equation > strong {
    display: block;
    margin-bottom: 0.24rem;
    color: var(--chalkboard-surface-muted);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 0.7em;
    font-weight: 800;
    letter-spacing: 0.08em;
    line-height: 1.2;
    text-transform: uppercase;
}

.chalkboard-rich-editor .xtra-chalkboard-formula > span,
.chalkboard-rich-editor .xtra-chalkboard-worked-equation > span,
.chalkboard-view .xtra-chalkboard-formula > span,
.chalkboard-view .xtra-chalkboard-worked-equation > span,
.xtra-board-rich-editor .xtra-chalkboard-formula > span,
.xtra-board-rich-editor .xtra-chalkboard-worked-equation > span {
    display: block;
    max-width: 100%;
    font-family: "Cambria Math", Cambria, Georgia, "Times New Roman", serif;
    font-size: clamp(1.05rem, 2.1vw, 1.35rem);
    font-variant-numeric: lining-nums tabular-nums;
    font-weight: 700;
    line-height: 1.35;
    overflow-wrap: anywhere;
}

.chalkboard-rich-editor .xtra-chalkboard-video-frame iframe,
.chalkboard-rich-editor .xtra-chalkboard-video-frame > video,
.teacher-chalkboard-editor .xtra-chalkboard-video-frame iframe,
.teacher-chalkboard-editor .xtra-chalkboard-video-frame > video,
.xtra-board-rich-editor .xtra-chalkboard-video-frame iframe,
.xtra-board-rich-editor .xtra-chalkboard-video-frame > video {
    pointer-events: none;
}

.chalkboard-rich-editor .xtra-chalkboard-video.is-playing .xtra-chalkboard-video-frame iframe,
.teacher-chalkboard-editor .xtra-chalkboard-video.is-playing .xtra-chalkboard-video-frame iframe,
.xtra-board-rich-editor .xtra-chalkboard-video.is-playing .xtra-chalkboard-video-frame iframe,
.chalkboard-rich-editor .xtra-chalkboard-video-play,
.teacher-chalkboard-editor .xtra-chalkboard-video-play,
.xtra-board-rich-editor .xtra-chalkboard-video-play {
    pointer-events: auto;
}

.chalkboard-rich-editor .xtra-chalkboard-video-external-link,
.teacher-chalkboard-editor .xtra-chalkboard-video-external-link,
.xtra-board-rich-editor .xtra-chalkboard-video-external-link {
    pointer-events: none;
}

.chalkboard-rich-editor .xtra-chalkboard-video.is-selected-chalkboard-image,
.teacher-chalkboard-editor .xtra-chalkboard-video.is-selected-chalkboard-image,
.xtra-board-rich-editor .xtra-chalkboard-video.is-selected-chalkboard-image {
    outline: 3px solid #93c5fd;
    outline-offset: 4px;
}

@media (max-width: 575.98px) {
    .xtra-chalkboard-video {
        width: 100% !important;
    }
}

@media print {
    .xtra-chalkboard-video {
        width: 100% !important;
        min-width: 0;
        margin: 0.85rem 0;
        break-inside: avoid;
    }

    .xtra-chalkboard-video-frame {
        display: none !important;
    }

    .xtra-chalkboard-video-playback-help {
        display: none !important;
    }

    .xtra-chalkboard-video-print {
        display: block !important;
        color: #111827 !important;
        text-decoration: none !important;
    }

    .xtra-chalkboard-video-thumbnail {
        display: block;
        width: min(100%, 560px) !important;
        max-width: 100% !important;
        height: auto !important;
        margin: 0 0 0.35rem !important;
        border: 1px solid #9ca3af;
        border-radius: 0.35rem;
    }

    .xtra-chalkboard-video-link {
        display: block;
        overflow-wrap: anywhere;
        font-weight: 700;
    }

    .chalkboard-view th,
    .chalkboard-view td {
        border-color: #9ca3af !important;
        color: #111827 !important;
    }

    .chalkboard-view th {
        background: #f3f4f6 !important;
    }

    .chalkboard-view blockquote,
    .chalkboard-view pre {
        border-color: #9ca3af !important;
        background: transparent !important;
        color: #111827 !important;
    }

    .chalkboard-view .xtra-chalkboard-formula,
    .chalkboard-view .xtra-chalkboard-worked-equation {
        border-color: #6b7280 !important;
        background: transparent !important;
        box-shadow: none !important;
        color: #111827 !important;
    }

    .chalkboard-view .xtra-chalkboard-formula > strong,
    .chalkboard-view .xtra-chalkboard-formula > span,
    .chalkboard-view .xtra-chalkboard-worked-equation > strong,
    .chalkboard-view .xtra-chalkboard-worked-equation > span {
        color: #111827 !important;
    }

    .chalkboard-view mark {
        background: transparent !important;
        color: #111827 !important;
        text-decoration: underline;
    }
}

html {
    color-scheme: light;
}

html[data-theme="dark"] {
    --school-ink: #edf4f2;
    --school-muted: #b5c2cc;
    --school-line: #314252;
    --school-paper: #172330;
    --school-bg: #0f1720;
    --school-navy: #9ec5ff;
    --school-table-header: #294866;
    --school-table-header-border: #365d7d;
    --school-green: #6ec795;
    --school-green-dark: #55ad7b;
    --school-gold: #e3bd65;
    --school-red: #ee7d79;
    --school-blue: #8db9f5;
    --school-sky: #1f3248;
    --school-mint: #183528;
    --school-cream: #2d281a;
    --school-shadow: 0 12px 28px rgba(0, 0, 0, 0.32);
    --school-body-start: rgba(25, 42, 56, 0.92);
    --school-body-end: rgba(15, 23, 32, 0.98);
    --school-control-bg: #101b26;
    --school-control-readonly: #1b2a38;
    --school-hover: rgba(52, 78, 101, 0.42);
    --school-alert-info-bg: #132b3a;
    --school-alert-info-border: #315f78;
    --school-alert-success-bg: #123323;
    --school-alert-success-border: #2c6a49;
    --school-alert-warning-bg: #332912;
    --school-alert-warning-border: #7c6120;
    --school-alert-danger-bg: #3a1818;
    --school-alert-danger-border: #7a3836;
    --chalkboard-panel-start: #103931;
    --chalkboard-panel-end: #082320;
    --chalkboard-panel-accent: rgba(111, 207, 151, 0.16);
    --chalkboard-panel-border: rgba(111, 207, 151, 0.34);
    --chalkboard-panel-text: #f7fff5;
    --chalkboard-panel-muted: rgba(232, 255, 240, 0.72);
    --chalkboard-panel-shadow: 0 18px 45px rgba(0, 0, 0, 0.3), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
    --chalkboard-surface-start: #0c2d28;
    --chalkboard-surface-end: #071f1c;
    --chalkboard-surface-border: rgba(111, 207, 151, 0.3);
    --chalkboard-surface-frame: #7a5630;
    --chalkboard-toolbar-surface: rgba(4, 18, 30, 0.68);
    --chalkboard-action-bg: rgba(111, 207, 151, 0.1);
    --chalkboard-action-border: rgba(111, 207, 151, 0.52);
    --chalkboard-action-text: #dfffe8;
    --chalkboard-action-hover-bg: #6fcf97;
    --chalkboard-action-hover-text: #082016;
    --chalkboard-status-saving-bg: rgba(251, 191, 36, 0.12);
    --chalkboard-status-saving-border: rgba(251, 191, 36, 0.42);
    --chalkboard-status-saving-text: #fde68a;
    --chalkboard-status-saved-bg: rgba(111, 207, 151, 0.18);
    --chalkboard-status-saved-border: rgba(111, 207, 151, 0.56);
    --chalkboard-status-saved-text: #c7f9d4;
    --chalkboard-status-warning-bg: rgba(248, 113, 113, 0.14);
    --chalkboard-status-warning-border: rgba(248, 113, 113, 0.56);
    --chalkboard-status-warning-text: #fecaca;
    color-scheme: dark;
    --bs-body-color: var(--school-ink);
    --bs-body-bg: var(--school-bg);
    --bs-secondary-color: var(--school-muted);
    --bs-secondary-bg: var(--school-control-readonly);
    --bs-tertiary-bg: var(--school-control-bg);
    --bs-border-color: var(--school-line);
    --bs-emphasis-color: #ffffff;
    --bs-link-color: var(--school-blue);
    --bs-link-hover-color: #c8ddff;
    --bs-form-control-bg: var(--school-control-bg);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) {
        --school-ink: #edf4f2;
        --school-muted: #b5c2cc;
        --school-line: #314252;
        --school-paper: #172330;
        --school-bg: #0f1720;
        --school-navy: #9ec5ff;
        --school-table-header: #294866;
        --school-table-header-border: #365d7d;
        --school-green: #6ec795;
        --school-green-dark: #55ad7b;
        --school-gold: #e3bd65;
        --school-red: #ee7d79;
        --school-blue: #8db9f5;
        --school-sky: #1f3248;
        --school-mint: #183528;
        --school-cream: #2d281a;
        --school-shadow: 0 12px 28px rgba(0, 0, 0, 0.32);
        --school-body-start: rgba(25, 42, 56, 0.92);
        --school-body-end: rgba(15, 23, 32, 0.98);
        --school-control-bg: #101b26;
        --school-control-readonly: #1b2a38;
        --school-hover: rgba(52, 78, 101, 0.42);
        --school-alert-info-bg: #132b3a;
        --school-alert-info-border: #315f78;
        --school-alert-success-bg: #123323;
        --school-alert-success-border: #2c6a49;
        --school-alert-warning-bg: #332912;
        --school-alert-warning-border: #7c6120;
        --school-alert-danger-bg: #3a1818;
        --school-alert-danger-border: #7a3836;
        --chalkboard-panel-start: #103931;
        --chalkboard-panel-end: #082320;
        --chalkboard-panel-accent: rgba(111, 207, 151, 0.16);
        --chalkboard-panel-border: rgba(111, 207, 151, 0.34);
        --chalkboard-panel-text: #f7fff5;
        --chalkboard-panel-muted: rgba(232, 255, 240, 0.72);
        --chalkboard-panel-shadow: 0 18px 45px rgba(0, 0, 0, 0.3), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
        --chalkboard-surface-start: #0c2d28;
        --chalkboard-surface-end: #071f1c;
        --chalkboard-surface-border: rgba(111, 207, 151, 0.3);
        --chalkboard-surface-frame: #7a5630;
        --chalkboard-toolbar-surface: rgba(4, 18, 30, 0.68);
        --chalkboard-action-bg: rgba(111, 207, 151, 0.1);
        --chalkboard-action-border: rgba(111, 207, 151, 0.52);
        --chalkboard-action-text: #dfffe8;
        --chalkboard-action-hover-bg: #6fcf97;
        --chalkboard-action-hover-text: #082016;
        --chalkboard-status-saving-bg: rgba(251, 191, 36, 0.12);
        --chalkboard-status-saving-border: rgba(251, 191, 36, 0.42);
        --chalkboard-status-saving-text: #fde68a;
        --chalkboard-status-saved-bg: rgba(111, 207, 151, 0.18);
        --chalkboard-status-saved-border: rgba(111, 207, 151, 0.56);
        --chalkboard-status-saved-text: #c7f9d4;
        --chalkboard-status-warning-bg: rgba(248, 113, 113, 0.14);
        --chalkboard-status-warning-border: rgba(248, 113, 113, 0.56);
        --chalkboard-status-warning-text: #fecaca;
        color-scheme: dark;
        --bs-body-color: var(--school-ink);
        --bs-body-bg: var(--school-bg);
        --bs-secondary-color: var(--school-muted);
        --bs-secondary-bg: var(--school-control-readonly);
        --bs-tertiary-bg: var(--school-control-bg);
        --bs-border-color: var(--school-line);
        --bs-emphasis-color: #ffffff;
        --bs-link-color: var(--school-blue);
        --bs-link-hover-color: #c8ddff;
        --bs-form-control-bg: var(--school-control-bg);
    }
}

html[data-theme="dark"] hr,
html[data-theme="dark"] .border,
html[data-theme="dark"] .border-top,
html[data-theme="dark"] .border-end,
html[data-theme="dark"] .border-bottom,
html[data-theme="dark"] .border-start {
    border-color: var(--school-line) !important;
}

html[data-theme="dark"] .input-group-text,
html[data-theme="dark"] .page-link,
html[data-theme="dark"] .nav-tabs .nav-link,
html[data-theme="dark"] .nav-pills .nav-link:not(.active),
html[data-theme="dark"] code,
html[data-theme="dark"] pre,
html[data-theme="dark"] kbd {
    background: var(--school-control-readonly);
    border-color: var(--school-line);
    color: var(--school-ink);
}

html[data-theme="dark"] .nav-tabs {
    border-color: var(--school-line);
}

html[data-theme="dark"] .nav-tabs .nav-link.active,
html[data-theme="dark"] .page-item.active .page-link {
    background: var(--school-paper);
    border-color: var(--school-line);
    color: var(--school-green);
}

html[data-theme="dark"] .form-check-input {
    background-color: var(--school-control-bg);
    border-color: #718197;
}

html[data-theme="dark"] .form-check-input:checked {
    background-color: var(--school-green);
    border-color: var(--school-green);
}

html[data-theme="dark"] .btn-close {
    filter: invert(1) grayscale(1) brightness(1.8);
}

html[data-theme="dark"] .text-bg-secondary,
html[data-theme="dark"] .bg-secondary {
    background-color: #425466 !important;
    color: #f7fbff !important;
}

html[data-theme="dark"] .text-bg-light,
html[data-theme="dark"] .badge.bg-light {
    background-color: var(--school-control-readonly) !important;
    color: var(--school-ink) !important;
}

html[data-theme="dark"] .disabled,
html[data-theme="dark"] :disabled {
    color: #9aa9b6 !important;
    opacity: 0.75;
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--school-bg);
}

body {
    min-height: 100%;
    margin: 0;
    background:
        linear-gradient(180deg, var(--school-body-start), var(--school-body-end) 260px),
        var(--school-bg) !important;
    color: var(--school-ink) !important;
    font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.55;
}

a {
    color: var(--school-blue);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.14em;
}

a:hover {
    color: var(--school-navy);
}

.container {
    max-width: 1180px;
}

.container.my-5,
.container.py-5 {
    margin-top: 2.25rem !important;
    margin-bottom: 2.25rem !important;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--school-ink);
    font-weight: 700;
    letter-spacing: 0;
}

h1, h2 {
    color: var(--school-green);
}

p,
label,
.card-title,
.card-text,
.card-body,
.table td,
.table th {
    color: var(--school-ink);
}

.text-success {
    color: var(--school-green) !important;
}

.text-primary {
    color: var(--school-green) !important;
}

.text-muted {
    color: var(--school-muted) !important;
}

.text-body,
.text-black,
.text-dark {
    color: var(--school-ink) !important;
}

.navbar {
    background: var(--school-paper) !important;
    border-bottom: 1px solid var(--school-line);
    box-shadow: 0 4px 16px rgba(31, 58, 95, 0.06);
}

.bg-light,
.bg-white {
    background-color: var(--school-paper) !important;
}

.navbar-brand {
    color: var(--school-navy) !important;
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    font-weight: 800;
}

.navbar-brand::before {
    content: "";
    width: 42px;
    height: 42px;
    flex: 0 0 42px;
    border: 1px solid rgba(199, 151, 47, 0.45);
    border-radius: 50%;
    background: #020604 url("/assets/images/xtra-classes-logo.png") center / cover no-repeat;
    box-shadow: 0 5px 16px rgba(4, 58, 32, 0.18);
}

@media (max-width: 575.98px) {
    .navbar-brand::before {
        width: 36px;
        height: 36px;
        flex-basis: 36px;
    }
}

.navbar .nav-link,
.navbar .text-white {
    color: var(--school-muted) !important;
    font-weight: 600;
}

.navbar .nav-link.active,
.navbar .nav-link:hover {
    color: var(--school-green) !important;
}

.card {
    border: 1px solid var(--school-line) !important;
    border-radius: var(--school-radius) !important;
    background: var(--school-paper);
    box-shadow: var(--school-shadow) !important;
}

.card-header {
    border-bottom: 1px solid var(--school-line);
    background: var(--school-sky) !important;
    color: var(--school-ink) !important;
    font-weight: 700;
}

.card-footer {
    background: var(--school-bg);
    border-top: 1px solid var(--school-line);
    color: var(--school-muted);
}

.shadow,
.shadow-sm,
.shadow-lg {
    box-shadow: var(--school-shadow) !important;
}

.form-label {
    color: var(--school-ink);
    font-weight: 650;
    margin-bottom: 0.35rem;
}

.form-control,
.form-select,
textarea,
input[type="file"] {
    border: 1px solid var(--school-line) !important;
    border-radius: 6px !important;
    color: var(--school-ink);
    background-color: var(--school-control-bg);
}

.form-control::placeholder,
textarea::placeholder {
    color: var(--school-muted);
    opacity: 0.78;
}

select option {
    color: var(--school-ink);
    background: var(--school-control-bg);
}

input[type="file"]::file-selector-button {
    margin: -0.375rem 0.75rem -0.375rem -0.75rem;
    padding: 0.375rem 0.75rem;
    border: 0;
    border-right: 1px solid var(--school-line);
    background: var(--school-control-readonly);
    color: var(--school-ink);
    font-weight: 650;
}

.form-control.bg-light,
.form-select.bg-light,
.bg-light.form-control,
.bg-light.form-select {
    background-color: var(--school-control-readonly) !important;
    color: var(--school-ink) !important;
}

.form-control:focus,
.form-select:focus,
textarea:focus {
    border-color: var(--school-green) !important;
    box-shadow: 0 0 0 0.2rem rgba(47, 125, 87, 0.16) !important;
}

.form-text,
.small {
    color: var(--school-muted);
}

.btn {
    border-radius: 6px;
    font-weight: 650;
}

.btn-success,
.btn-primary {
    background-color: var(--school-green) !important;
    border-color: var(--school-green) !important;
    color: #fff !important;
}

.btn-success:hover,
.btn-primary:hover {
    background-color: var(--school-green-dark) !important;
    border-color: var(--school-green-dark) !important;
}

.btn-danger {
    background-color: var(--school-red) !important;
    border-color: var(--school-red) !important;
}

.btn-warning {
    background-color: var(--school-gold) !important;
    border-color: var(--school-gold) !important;
    color: var(--school-ink) !important;
}

.btn-outline-primary,
.btn-outline-success {
    color: var(--school-green) !important;
    border-color: var(--school-green) !important;
}

.btn-outline-primary:hover,
.btn-outline-success:hover {
    background-color: var(--school-green) !important;
    color: #fff !important;
}

.btn-outline-secondary,
.btn-secondary {
    color: var(--school-navy) !important;
    border-color: var(--school-line) !important;
    background-color: var(--school-paper) !important;
}

.btn-outline-secondary:hover,
.btn-secondary:hover {
    color: #fff !important;
    background-color: var(--school-navy) !important;
    border-color: var(--school-navy) !important;
}

.btn-outline-danger {
    color: var(--school-red) !important;
    border-color: var(--school-red) !important;
}

.btn-outline-danger:hover {
    background-color: var(--school-red) !important;
    color: #fff !important;
}

.btn-outline-dark {
    color: var(--school-navy) !important;
    border-color: var(--school-navy) !important;
}

.btn-outline-dark:hover {
    background-color: var(--school-navy) !important;
    color: #fff !important;
}

.table {
    background: var(--school-paper);
    border-color: var(--school-line);
    color: var(--school-ink);
}

.table > :not(caption) > * {
    color: var(--school-ink);
}

.table > :not(caption) > * > * {
    border-color: var(--school-line);
    vertical-align: middle;
    background-color: var(--school-paper);
}

.table thead th,
.table-dark th {
    background: var(--school-table-header) !important;
    color: #fff !important;
    border-color: var(--school-table-header-border) !important;
    font-weight: 700;
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: var(--school-hover);
}

html[data-theme="dark"] .table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: var(--school-hover);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .table-striped > tbody > tr:nth-of-type(odd) > * {
        background-color: var(--school-hover);
    }
}

.table-hover > tbody > tr:hover > * {
    background-color: var(--school-hover);
    color: var(--school-ink);
}

.alert {
    border-radius: var(--school-radius);
    border-width: 1px;
    color: var(--school-ink);
}

.alert-info {
    background-color: var(--school-alert-info-bg);
    border-color: var(--school-alert-info-border);
    color: var(--school-ink);
}

.alert-success {
    background-color: var(--school-alert-success-bg);
    border-color: var(--school-alert-success-border);
    color: var(--school-ink);
}

.alert-warning {
    background-color: var(--school-alert-warning-bg);
    border-color: var(--school-alert-warning-border);
    color: var(--school-ink);
}

.alert-danger {
    background-color: var(--school-alert-danger-bg);
    border-color: var(--school-alert-danger-border);
    color: var(--school-ink);
}

.xtra-help-note {
    background: var(--school-alert-info-bg);
    border: 1px solid var(--school-alert-info-border);
    border-radius: var(--school-radius);
    color: var(--school-ink);
    padding: 1rem;
}

.xtra-help-note strong {
    color: var(--school-ink);
}

.xtra-help-note p,
.xtra-help-note li {
    color: var(--school-ink);
}

.xtra-help-note .text-muted,
.xtra-help-note small {
    color: var(--school-muted) !important;
}

.xtra-help-note ul,
.xtra-help-note ol {
    margin-bottom: 0;
    padding-left: 1.25rem;
}

.lesson-transcript-panel {
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: var(--school-control-bg);
    color: var(--school-ink);
    padding: 0.85rem 1rem;
}

.lesson-transcript-panel > summary {
    color: var(--school-green);
    cursor: pointer;
    font-weight: 800;
}

.lesson-transcript-panel[open] > summary {
    border-bottom: 1px solid var(--school-line);
    margin-bottom: 0.85rem;
    padding-bottom: 0.85rem;
}

.lesson-transcript-panel .xtra-help-note,
.lesson-transcript-panel textarea {
    background: var(--school-paper);
    color: var(--school-ink);
}

.lesson-transcript-panel .xtra-help-note {
    max-height: 22rem;
    overflow: auto;
    white-space: pre-wrap;
}

.comments-section .bg-light {
    background: var(--school-control-readonly) !important;
    color: var(--school-ink) !important;
}

.quiz-timer-widget {
    position: fixed;
    right: max(1rem, env(safe-area-inset-right));
    top: max(1rem, env(safe-area-inset-top));
    z-index: 1060;
    width: min(280px, calc(100vw - 2rem));
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    padding: 0.9rem 1rem;
    border: 1px solid var(--school-alert-warning-border);
    border-radius: 16px;
    background:
        linear-gradient(135deg, rgba(199, 151, 47, 0.22), transparent),
        var(--school-paper);
    color: var(--school-ink);
    box-shadow: 0 18px 46px rgba(0, 0, 0, 0.22);
}

.quiz-timer-widget.is-minimized {
    display: none;
}

.quiz-timer-label {
    display: block;
    color: var(--school-muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.quiz-timer-widget strong {
    display: block;
    color: var(--school-ink);
    font-size: 2rem;
    font-weight: 900;
    line-height: 1;
}

.quiz-timer-widget small {
    color: var(--school-muted);
    font-weight: 650;
}

.quiz-timer-widget button,
.quiz-timer-tab {
    border: 1px solid var(--school-line);
    border-radius: 999px;
    background: var(--school-control-bg);
    color: var(--school-navy);
    font-weight: 800;
    padding: 0.4rem 0.7rem;
}

.quiz-timer-widget.is-urgent,
.quiz-timer-tab.is-urgent {
    border-color: var(--school-red);
    box-shadow: 0 0 0 0.18rem rgba(185, 65, 63, 0.16), 0 18px 46px rgba(0, 0, 0, 0.22);
}

.quiz-timer-tab {
    position: fixed;
    right: max(1rem, env(safe-area-inset-right));
    top: max(1rem, env(safe-area-inset-top));
    z-index: 1060;
    box-shadow: var(--school-shadow);
}

.quiz-timer-tab strong {
    margin-left: 0.35rem;
}

.grade-check-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.35rem 0.75rem;
}

.teacher-search-control {
    min-width: min(100%, 320px);
}

.teacher-card-header {
    cursor: pointer;
}

.teacher-card-header:hover h5 {
    color: var(--school-green);
}

.teacher-edit-details {
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: var(--school-control-bg);
    padding: 0.85rem 1rem;
}

.teacher-edit-details > summary {
    color: var(--school-green);
    cursor: pointer;
    font-weight: 700;
}

.teacher-edit-details[open] > summary {
    border-bottom: 1px solid var(--school-line);
    margin-bottom: 0.85rem;
    padding-bottom: 0.85rem;
}

.border.rounded {
    border-color: var(--school-line) !important;
    background: var(--school-control-bg);
}

.badge {
    border-radius: 6px;
    font-weight: 700;
}

.text-bg-success,
.bg-success {
    background-color: var(--school-green) !important;
    color: #fff !important;
}

.text-bg-warning,
.bg-warning {
    background-color: var(--school-gold) !important;
    color: #17212b !important;
}

.text-bg-info,
.bg-info {
    background-color: var(--school-sky) !important;
    color: var(--school-ink) !important;
}

.text-bg-primary,
.bg-primary {
    background-color: var(--school-navy) !important;
    color: #fff !important;
}

.progress {
    background-color: var(--school-control-readonly);
    border-radius: 999px;
}

.progress-bar.bg-success {
    background-color: var(--school-green) !important;
}

.progress-bar.bg-warning {
    background-color: var(--school-gold) !important;
}

.progress-bar.bg-danger {
    background-color: var(--school-red) !important;
}

.dashboard-card {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.dashboard-card:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 14px 30px rgba(31, 58, 95, 0.12) !important;
}

html[data-theme="dark"] .dashboard-card:hover {
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.38) !important;
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .dashboard-card:hover {
        box-shadow: 0 18px 34px rgba(0, 0, 0, 0.38) !important;
    }
}

.border-primary,
.border-success,
.border-info,
.border-warning {
    border-color: var(--school-line) !important;
}

.quiz-question-card {
    background: var(--school-paper);
    border-color: var(--school-line) !important;
}

.chalkboard-panel {
    background:
        radial-gradient(circle at top left, var(--chalkboard-panel-accent), transparent 38%),
        linear-gradient(180deg, var(--chalkboard-panel-start), var(--chalkboard-panel-end)) !important;
    border-color: var(--chalkboard-panel-border) !important;
    box-shadow: var(--chalkboard-panel-shadow);
    color: var(--chalkboard-panel-text);
}

.chalkboard-view {
    background: linear-gradient(180deg, var(--chalkboard-surface-start), var(--chalkboard-surface-end)) !important;
    border-color: var(--chalkboard-surface-frame) !important;
    color: var(--chalkboard-surface-text) !important;
    box-shadow: var(--chalkboard-surface-shadow);
}

.chalkboard-panel textarea,
.chalkboard-rich-editor {
    background: linear-gradient(180deg, var(--chalkboard-surface-start), var(--chalkboard-surface-end)) !important;
    border-color: var(--chalkboard-surface-border) !important;
    color: var(--chalkboard-surface-text) !important;
}

.chalkboard-view h1,
.chalkboard-view h2,
.chalkboard-view h3,
.chalkboard-view h4,
.chalkboard-view h5,
.chalkboard-view h6 {
    color: var(--chalkboard-heading) !important;
}

.chalkboard-view a {
    color: var(--chalkboard-link) !important;
}

.chalkboard-view table,
.chalkboard-rich-editor table {
    width: 100%;
    border-collapse: collapse;
    color: inherit;
}

.chalkboard-view td,
.chalkboard-view th {
    padding: 0.45rem 0.58rem;
    border: 1px solid var(--chalkboard-table-border);
    vertical-align: top;
    overflow-wrap: anywhere;
}

.chalkboard-view th {
    background: var(--chalkboard-table-heading);
    color: var(--chalkboard-heading);
    font-weight: 700;
}

.chalkboard-view blockquote {
    margin: 0.75rem 0;
    padding: 0.7rem 0.95rem;
    border-left: 4px solid #6fcf97;
    background: var(--chalkboard-callout);
    color: inherit;
}

.chalkboard-view pre {
    padding: 0.8rem 0.95rem;
    border: 1px solid var(--chalkboard-code-border);
    border-radius: 8px;
    background: var(--chalkboard-code-bg);
    color: var(--chalkboard-code-text);
    white-space: pre-wrap;
}

.chalkboard-view hr {
    border-color: var(--chalkboard-rule);
    opacity: 1;
}

.chalkboard-view mark,
.chalkboard-rich-editor mark {
    padding: 0.05rem 0.15rem;
    background: #fde68a;
    color: #111827;
}

.accordion-item,
.list-group-item {
    border-color: var(--school-line);
    background: var(--school-paper);
    color: var(--school-ink);
}

.accordion-button,
.accordion-button:not(.collapsed),
.accordion-body,
.dropdown-menu,
.modal-content,
.modal-header,
.modal-footer,
.toast,
.popover {
    background-color: var(--school-paper);
    color: var(--school-ink);
    border-color: var(--school-line);
}

.accordion-button::after {
    filter: grayscale(1);
}

html[data-theme="dark"] .accordion-button::after {
    filter: invert(1) grayscale(1);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .accordion-button::after {
        filter: invert(1) grayscale(1);
    }
}

.dropdown-item,
.modal-title {
    color: var(--school-ink);
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: var(--school-hover);
    color: var(--school-ink);
}

.border,
.border-top,
.border-end,
.border-bottom,
.border-start {
    border-color: var(--school-line) !important;
}

.btn-close {
    filter: none;
}

html[data-theme="dark"] .btn-close {
    filter: invert(1) grayscale(1);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .btn-close {
        filter: invert(1) grayscale(1);
    }
}

.page-link {
    color: var(--school-green);
    background-color: var(--school-paper);
    border-color: var(--school-line);
}

.page-item.active .page-link {
    background-color: var(--school-green);
    border-color: var(--school-green);
}

body.auth-page {
    min-height: 100vh;
    background:
        linear-gradient(180deg, rgba(31, 58, 95, 0.92), rgba(47, 125, 87, 0.9)),
        var(--school-navy) !important;
}

html[data-theme="dark"] body.auth-page {
    background:
        linear-gradient(180deg, rgba(12, 22, 31, 0.96), rgba(17, 48, 34, 0.92)),
        var(--school-bg) !important;
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) body.auth-page {
        background:
            linear-gradient(180deg, rgba(12, 22, 31, 0.96), rgba(17, 48, 34, 0.92)),
            var(--school-bg) !important;
    }
}

.theme-mode-switcher {
    position: fixed;
    right: 10px;
    bottom: 10px;
    z-index: 1050;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.22rem;
    border: 1px solid var(--school-line);
    border-radius: 999px;
    background: var(--school-paper);
    box-shadow: var(--school-shadow);
    opacity: 0.74;
    transform: scale(0.86);
    transform-origin: right bottom;
    transition: opacity 0.16s ease, transform 0.16s ease;
}

.theme-mode-switcher:hover,
.theme-mode-switcher:focus-within {
    opacity: 1;
    transform: scale(1);
}

.theme-mode-switcher label {
    color: var(--school-muted);
    font-size: 0.68rem;
    font-weight: 700;
    margin: 0;
    padding-left: 0.35rem;
}

.theme-mode-switcher select {
    min-width: 82px;
    border: 1px solid var(--school-line);
    border-radius: 999px;
    background: var(--school-paper);
    color: var(--school-ink);
    font-weight: 650;
    font-size: 0.78rem;
    padding: 0.16rem 1.45rem 0.16rem 0.42rem;
}

html[data-theme="dark"] .navbar-toggler-icon {
    filter: invert(1);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .navbar-toggler-icon {
        filter: invert(1);
    }
}

html[data-theme="dark"] .text-dark {
    color: var(--school-ink) !important;
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .text-dark {
        color: var(--school-ink) !important;
    }
}

.auth-card {
    max-width: 560px;
    margin: 0 auto;
}

.auth-card .card-header {
    background: var(--school-navy) !important;
    color: #fff !important;
}

.auth-card .card-header h4 {
    color: #fff;
}

@media (max-width: 768px) {
    .container.my-5,
    .container.py-5 {
        margin-top: 1rem !important;
        margin-bottom: 1rem !important;
    }

    .card {
        border-radius: 6px !important;
    }

    h1, h2 {
        font-size: 1.7rem;
    }
}

/* Cohesive XtraClass application shell */
.xtra-app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.xtra-page-main {
    flex: 1 0 auto;
    width: 100%;
}

.xtra-app-nav {
    position: sticky;
    top: 0;
    z-index: 1030;
    backdrop-filter: saturate(1.15) blur(10px);
}

.xtra-app-nav .container-fluid {
    max-width: 1220px;
}

.xtra-app-footer {
    flex: 0 0 auto;
    border-top: 1px solid var(--school-line);
    background: var(--school-paper);
    color: var(--school-muted);
    text-align: center;
    padding: 1rem;
}

.main-content {
    width: 100%;
}

.container > h1:first-child,
.container > h2:first-child,
.container.my-5 > h1:first-child,
.container.my-5 > h2:first-child {
    margin-bottom: 1rem;
}

.page-kicker,
.xtra-page-kicker {
    color: var(--school-muted);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0;
}

.section-panel,
.xtra-section-panel {
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: var(--school-paper);
    box-shadow: var(--school-shadow);
}

.card h1,
.card h2,
.card h3,
.card h4,
.card h5,
.card h6 {
    line-height: 1.2;
}

.card p:last-child,
.xtra-help-note p:last-child {
    margin-bottom: 0;
}

.card a:not(.btn) {
    font-weight: 650;
}

a.text-decoration-none .card,
.learning-card,
.dashboard-card {
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

a.text-decoration-none:hover .card,
a.text-decoration-none:focus-visible .card,
.learning-card:hover,
.dashboard-card:hover {
    border-color: rgba(47, 125, 87, 0.42) !important;
    transform: translateY(-2px);
}

.btn {
    min-height: 2.35rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
}

.btn-sm {
    min-height: 2rem;
}

.btn-group .btn {
    min-height: auto;
}

.form-control,
.form-select {
    min-height: 2.45rem;
}

textarea.form-control {
    min-height: 6rem;
}

.badge {
    line-height: 1.1;
    padding: 0.42em 0.56em;
}

.table-responsive {
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: var(--school-paper);
}

.table-responsive > .table {
    margin-bottom: 0;
}

.toast {
    box-shadow: var(--school-shadow);
}

@media (max-width: 768px) {
    .d-flex.justify-content-between.align-items-center,
    .d-flex.justify-content-between.align-items-start {
        gap: 0.75rem;
    }

    .container .btn,
    .container-fluid .btn {
        white-space: normal;
    }

    .xtra-app-nav .navbar-nav {
        padding-top: 0.65rem;
    }

    .xtra-app-nav .nav-link {
        padding: 0.55rem 0;
    }
}

/* Manage Subjects */
.xtra-subject-admin {
    max-width: 1180px;
}

.xtra-subject-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
}

.xtra-subject-hero h1 {
    font-size: clamp(2rem, 4vw, 2.55rem);
    line-height: 1;
}

.xtra-subject-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    justify-content: flex-end;
}

.xtra-subject-overview {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
}

.xtra-subject-stat {
    display: grid;
    gap: 0.35rem;
    padding: 1rem 1.1rem;
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: color-mix(in srgb, var(--school-paper) 88%, var(--school-sky));
    box-shadow: var(--school-shadow);
}

.xtra-subject-stat span {
    color: var(--school-muted);
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

.xtra-subject-stat strong {
    color: var(--school-green);
    font-size: 2rem;
    line-height: 1;
}

.xtra-subject-create,
.xtra-subject-directory {
    border: 1px solid var(--school-line);
    background: var(--school-paper);
}

.xtra-subject-section-head,
.xtra-subject-directory-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
}

.xtra-subject-create-form {
    display: grid;
    grid-template-columns: minmax(240px, 0.75fr) minmax(280px, 1.25fr) auto;
    gap: 1.1rem;
    align-items: end;
}

.xtra-subject-create-actions {
    display: flex;
    justify-content: flex-end;
}

.xtra-subject-filter {
    min-width: 0;
    width: min(100%, 340px);
}

.xtra-subject-teacher-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    max-height: 8.8rem;
    overflow: auto;
    padding: 0.55rem;
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: var(--school-control-bg);
}

.xtra-subject-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.48rem 0.62rem;
    border: 1px solid var(--school-line);
    border-radius: 999px;
    background: color-mix(in srgb, var(--school-control-bg) 88%, var(--school-bg));
    color: var(--school-ink);
    cursor: pointer;
    font-weight: 750;
}

.xtra-subject-pill:hover {
    border-color: color-mix(in srgb, var(--school-green) 58%, var(--school-line));
    background: var(--school-hover);
}

.xtra-subject-pill .form-check-input {
    margin: 0;
}

.xtra-subject-list {
    display: grid;
    gap: 1.25rem;
}

.xtra-subject-card {
    position: relative;
    display: grid;
    gap: 0.85rem;
    padding: 1.25rem 1.35rem 1.2rem;
    border: 1px solid color-mix(in srgb, var(--school-line) 88%, var(--school-green));
    border-left: 0.42rem solid color-mix(in srgb, var(--school-green) 80%, var(--school-line));
    border-radius: calc(var(--school-radius) + 2px);
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--school-mint) 42%, transparent), transparent 38%),
        color-mix(in srgb, var(--school-paper) 96%, var(--school-sky));
    box-shadow: 0 14px 34px rgba(3, 12, 22, 0.18);
}

.xtra-subject-card-open {
    border-left-color: color-mix(in srgb, #7ab7ff 74%, var(--school-green));
}

.xtra-subject-card-focus {
    border-left-color: var(--school-green);
}

.xtra-subject-card + .xtra-subject-card {
    margin-top: 0.15rem;
}

.xtra-subject-card-summary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
}

.xtra-subject-card-meta {
    min-width: 6rem;
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--school-line);
    border-radius: 10px;
    background: color-mix(in srgb, var(--school-mint) 80%, var(--school-paper));
    text-align: center;
}

.xtra-subject-card-meta strong {
    display: block;
    color: var(--school-green);
    font-size: 1.6rem;
    line-height: 1;
}

.xtra-subject-card-meta span {
    display: block;
    color: var(--school-muted);
    font-size: 0.8rem;
    font-weight: 800;
}

.xtra-subject-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.25rem 0 0.1rem;
}

.xtra-subject-chips span {
    display: inline-flex;
    align-items: center;
    min-height: 1.85rem;
    padding: 0.28rem 0.6rem;
    border: 1px solid var(--school-line);
    border-radius: 999px;
    background: color-mix(in srgb, var(--school-mint) 78%, var(--school-paper));
    color: var(--school-ink);
    font-size: 0.84rem;
    font-weight: 800;
}

.xtra-subject-details {
    border-top: 1px solid var(--school-line);
    margin-top: 0.2rem;
    padding-top: 0.9rem;
}

.xtra-subject-details > summary {
    width: fit-content;
    min-height: 2.2rem;
    padding: 0.45rem 0.8rem;
    border: 1px solid color-mix(in srgb, var(--school-green) 65%, var(--school-line));
    border-radius: 8px;
    color: var(--school-green);
    cursor: pointer;
    font-weight: 850;
    list-style-position: inside;
}

.xtra-subject-details > summary:hover,
.xtra-subject-details[open] > summary {
    background: var(--school-mint);
}

.xtra-subject-details-grid {
    display: grid;
    grid-template-columns: minmax(240px, 0.75fr) minmax(280px, 1.25fr);
    gap: 1.1rem;
    align-items: start;
    margin-top: 1rem;
}

.xtra-subject-name-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.6rem;
}

.xtra-subject-name-row .btn {
    width: fit-content;
}

.xtra-teacher-access-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
    max-height: 15rem;
    overflow: auto;
    padding: 0.65rem;
    border: 1px solid var(--school-line);
    border-radius: var(--school-radius);
    background: var(--school-control-bg);
}

.xtra-teacher-access-row {
    display: flex;
    gap: 0.55rem;
    align-items: center;
    margin: 0;
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--school-line);
    border-radius: 7px;
    background: color-mix(in srgb, var(--school-control-bg) 88%, var(--school-bg));
    cursor: pointer;
}

.xtra-teacher-access-row:hover {
    border-color: color-mix(in srgb, var(--school-green) 55%, var(--school-line));
    background: var(--school-hover);
}

.xtra-teacher-access-row span {
    color: var(--school-ink);
    font-weight: 800;
    overflow-wrap: anywhere;
}

.xtra-teacher-access-row .form-check-input {
    margin: 0;
}

.xtra-subject-save-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    align-items: start;
}

.xtra-subject-save-row .btn {
    width: fit-content;
}

.xtra-subject-delete-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    padding: 1rem;
    border: 1px solid color-mix(in srgb, var(--school-red) 48%, var(--school-line));
    border-radius: var(--school-radius);
    background: color-mix(in srgb, var(--school-red) 8%, var(--school-paper));
}

.xtra-subject-delete-panel strong {
    display: block;
    margin-bottom: 0.25rem;
    color: color-mix(in srgb, var(--school-red) 82%, var(--school-ink));
}

.xtra-subject-delete-panel .btn {
    white-space: nowrap;
}

@media (max-width: 980px) {
    .xtra-subject-hero,
    .xtra-subject-create-form,
    .xtra-subject-directory-head,
    .xtra-subject-details-grid {
        grid-template-columns: 1fr;
    }

    .xtra-subject-hero-actions {
        justify-content: flex-start;
    }

    .xtra-subject-filter,
    .xtra-subject-create-actions {
        width: 100%;
        justify-content: flex-start;
    }
}

@media (max-width: 720px) {
    .xtra-subject-overview,
    .xtra-subject-card-summary,
    .xtra-teacher-access-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .xtra-subject-name-row,
    .xtra-subject-save-row {
        grid-template-columns: 1fr;
    }

    .xtra-subject-card-meta {
        width: 100%;
        text-align: left;
    }

    .xtra-subject-card-meta strong,
    .xtra-subject-card-meta span {
        display: inline;
    }

    .xtra-subject-delete-panel {
        align-items: flex-start;
        flex-direction: column;
    }
}

/* Classroom Students Card */
.xtra-classroom-students-card .xtra-classroom-student-list {
    display: grid;
    gap: 0.75rem;
}

.xtra-classroom-students-card .xtra-classroom-student-row {
    display: block;
    padding: 0.85rem !important;
    border: 1px solid var(--school-line) !important;
    border-radius: 12px !important;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--school-green) 8%, transparent), transparent 58%),
        var(--school-control-bg);
    box-shadow: 0 5px 14px rgba(31, 58, 95, 0.07);
    transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.xtra-classroom-students-card .xtra-classroom-student-row:hover {
    border-color: color-mix(in srgb, var(--school-green) 58%, var(--school-line)) !important;
    transform: translateY(-1px);
    box-shadow: 0 9px 20px rgba(31, 58, 95, 0.11);
}

.xtra-classroom-student-main {
    display: grid;
    grid-template-columns: 2.5rem minmax(0, 1fr) max-content;
    gap: 0.65rem;
    align-items: center;
    min-width: 0;
}

.xtra-classroom-student-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--school-green) 72%, var(--school-sky));
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 900;
}

.xtra-classroom-student-copy {
    display: grid;
    gap: 0.05rem;
    min-width: 0;
}

.xtra-classroom-student-copy strong {
    color: var(--school-ink);
    font-size: 0.94rem;
    line-height: 1.25;
}

.xtra-classroom-student-copy strong,
.xtra-classroom-student-copy span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.xtra-classroom-student-copy span {
    color: var(--school-muted);
    font-size: 0.82rem;
}

.xtra-classroom-student-status {
    justify-self: end;
    width: fit-content;
    white-space: nowrap;
    padding: 0.34em 0.58em;
    font-size: 0.72rem;
}

.xtra-classroom-student-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.4rem;
    margin-top: 0.72rem;
    padding-top: 0.72rem;
    border-top: 1px solid var(--school-line);
}

.xtra-classroom-student-actions form {
    min-width: 0;
}

.xtra-classroom-student-actions .btn {
    width: 100%;
    min-height: 2rem;
    padding: 0.3rem 0.45rem;
    font-size: 0.74rem;
    line-height: 1.2;
    white-space: nowrap;
}

@media (max-width: 520px) {
    .xtra-classroom-student-main {
        grid-template-columns: 2.35rem minmax(0, 1fr);
    }

    .xtra-classroom-student-avatar {
        width: 2.35rem;
        height: 2.35rem;
    }

    .xtra-classroom-student-status {
        grid-column: 2;
        justify-self: start;
    }

    .xtra-classroom-student-actions {
        grid-template-columns: 1fr;
    }
}

/* Shared page-loading overlay */
#xtraLoadingModal.xtra-loading-modal {
    display: none !important;
}

html.xtra-is-loading {
    overflow: auto;
}

.xtra-page-loading {
    position: fixed;
    inset: 0;
    z-index: 3000;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: rgba(5, 13, 24, 0.68);
    backdrop-filter: blur(5px);
}

.xtra-page-loading[hidden] {
    display: none;
}

.xtra-loading-card {
    width: min(420px, 92vw);
    border: 1px solid rgba(111, 207, 151, 0.32);
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(18, 38, 55, 0.98), rgba(11, 23, 38, 0.98));
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
    color: #f4fbff;
    padding: 1.35rem;
}

.xtra-loading-spinner {
    width: 44px;
    height: 44px;
    border: 4px solid rgba(255, 255, 255, 0.18);
    border-top-color: #6fcf97;
    border-radius: 50%;
    animation: xtra-spin 0.85s linear infinite;
    flex: 0 0 auto;
}

.xtra-loading-title {
    font-size: 1.08rem;
    font-weight: 800;
    margin-bottom: 0.2rem;
}

.xtra-loading-message {
    color: var(--school-muted);
    margin: 0;
}

.btn.is-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.78;
}

.btn.is-loading::after {
    content: '';
    display: inline-block;
    width: 0.9em;
    height: 0.9em;
    margin-left: 0.55rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    vertical-align: -0.12em;
    animation: xtra-spin 0.7s linear infinite;
}

@keyframes xtra-spin {
    to {
        transform: rotate(360deg);
    }
}

/* Phone-only Xtra Classes usability pass. Desktop/tablet layout remains unchanged. */
@media (max-width: 640px) {
    html,
    body {
        max-width: 100%;
        overflow-x: hidden;
    }

    body {
        font-size: 0.95rem;
    }

    .container,
    .container-fluid {
        width: 100%;
        max-width: 100%;
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .container.my-5,
    .container.py-5,
    .container-fluid.my-5,
    .container-fluid.py-5 {
        margin-top: 0.85rem !important;
        margin-bottom: 0.85rem !important;
        padding-top: 0.75rem !important;
        padding-bottom: 0.75rem !important;
    }

    h1,
    .h1 {
        font-size: clamp(1.85rem, 9vw, 2.35rem);
        line-height: 1.05;
    }

    h2,
    .h2 {
        font-size: clamp(1.45rem, 7vw, 1.9rem);
    }

    h3,
    .h3 {
        font-size: clamp(1.22rem, 6vw, 1.55rem);
    }

    p,
    li,
    .text-muted,
    .small,
    small {
        overflow-wrap: anywhere;
    }

    .card,
    .section-panel,
    .xtra-section-panel,
    .xtra-subject-create,
    .xtra-subject-directory,
    .xtra-classroom-students-card {
        border-radius: 10px !important;
    }

    .card {
        padding: 1rem !important;
    }

    .row,
    .row.g-3,
    .row.g-4 {
        --bs-gutter-x: 0.9rem;
        --bs-gutter-y: 0.9rem;
    }

    .d-flex.justify-content-between,
    .d-flex.align-items-center,
    .d-flex.align-items-start {
        min-width: 0;
        flex-wrap: wrap;
        gap: 0.6rem;
    }

    .btn,
    .form-control,
    .form-select {
        min-height: 2.65rem;
    }

    .btn {
        max-width: 100%;
        white-space: normal;
        line-height: 1.18;
    }

    .btn-sm {
        min-height: 2.2rem;
    }

    .btn-group {
        flex-wrap: wrap;
        gap: 0.35rem;
    }

    .btn-group > .btn {
        border-radius: 8px !important;
    }

    textarea.form-control {
        min-height: 7rem;
    }

    input[type="file"].form-control,
    input[type="file"] {
        max-width: 100%;
        font-size: 0.9rem;
    }

    .table-responsive,
    .table {
        max-width: 100%;
    }

    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .table-responsive > .table,
    table.table {
        min-width: 620px;
    }

    .table th,
    .table td {
        padding: 0.62rem 0.7rem;
        vertical-align: middle;
    }

    .accordion-button {
        align-items: flex-start;
        gap: 0.6rem;
        white-space: normal;
    }

    .dropdown-menu {
        max-width: calc(100vw - 2rem);
        overflow-wrap: anywhere;
    }

    .theme-mode-switcher {
        right: max(6px, env(safe-area-inset-right));
        bottom: max(6px, env(safe-area-inset-bottom));
        transform: scale(0.72);
        opacity: 0.58;
    }

    .theme-mode-switcher:hover,
    .theme-mode-switcher:focus-within {
        transform: scale(0.86);
        opacity: 1;
    }

    .quiz-timer-widget {
        top: auto;
        right: max(0.65rem, env(safe-area-inset-right));
        bottom: max(0.65rem, env(safe-area-inset-bottom));
        width: min(21rem, calc(100vw - 1.3rem));
        padding: 0.7rem 0.8rem;
    }

    .quiz-timer-widget strong {
        font-size: 1.55rem;
    }

    .quiz-timer-tab {
        top: auto;
        right: max(0.65rem, env(safe-area-inset-right));
        bottom: max(0.65rem, env(safe-area-inset-bottom));
    }

    .chalkboard-panel,
    .chalkboard-view {
        border-radius: 12px !important;
    }

    body.classroom-page .chalkboard-panel {
        padding: 1rem !important;
    }

    body.classroom-page .chalkboard-studio-header {
        gap: 0.85rem;
        margin-bottom: 0.95rem;
    }

    body.classroom-page .chalkboard-studio-title .form-label {
        font-size: 1.35rem;
        line-height: 1.1;
    }

    body.classroom-page .chalkboard-studio-subtitle {
        display: block;
        max-width: 32rem;
        font-size: 0.92rem;
        line-height: 1.45;
    }

    body.classroom-page .chalkboard-studio-actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
        gap: 0.5rem;
    }

    body.classroom-page .chalkboard-studio-actions > .chalkboard-status-pill:first-child,
    body.classroom-page .chalkboard-studio-actions > .btn-group {
        grid-column: 1 / -1;
    }

    body.classroom-page .chalkboard-studio-actions > .btn-group {
        display: grid;
        grid-template-columns: 2.45rem minmax(0, 1fr) 2.45rem;
        align-items: center;
    }

    body.classroom-page .chalkboard-studio-actions .chalkboard-font-size-value {
        text-align: center;
    }

    body.classroom-page .chalkboard-status-pill,
    body.classroom-page .chalkboard-autosave-toggle,
    body.classroom-page .chalkboard-save-draft-btn,
    body.classroom-page .chalkboard-fullscreen-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        min-height: 2.25rem;
        padding: 0.38rem 0.55rem;
        font-size: 0.78rem;
        line-height: 1.15;
        text-align: center;
    }

    body.classroom-page .chalkboard-autosave-toggle input {
        flex: 0 0 auto;
    }

    body.classroom-page .chalkboard-rich-toolbar {
        display: grid;
        grid-template-columns: 1fr;
        gap: 0.52rem;
        padding: 0.62rem;
        margin-bottom: 0.65rem;
        border-radius: 12px;
    }

    body.classroom-page .chalkboard-tool-group {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.38rem;
        padding: 0.42rem;
    }

    body.classroom-page .chalkboard-tool-group[aria-label="Text layout"],
    body.classroom-page .chalkboard-tool-group[aria-label="Image tools"] {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    body.classroom-page .chalkboard-tool-group[aria-label="Cleanup tools"] {
        grid-template-columns: 1fr;
        width: fit-content;
        max-width: 100%;
    }

    body.classroom-page .chalkboard-rich-toolbar .btn,
    body.classroom-page .chalkboard-rich-toolbar .form-select,
    body.classroom-page .chalkboard-rich-toolbar .form-control-color {
        width: 100% !important;
        min-width: 0;
        min-height: 2.25rem;
        padding: 0.42rem 0.5rem;
        font-size: 0.82rem;
        text-align: center;
    }

    body.classroom-page .chalkboard-rich-toolbar .form-select {
        text-align: left;
        padding-right: 1.85rem;
    }

    body.classroom-page .chalkboard-rich-toolbar .form-control-color {
        min-width: 2.25rem;
    }

    .chalkboard-panel textarea,
    .chalkboard-view {
        min-height: 50vh;
        font-size: 0.96rem;
    }

    body.classroom-page .chalkboard-rich-editor {
        height: min(58vh, 32rem);
        min-height: 24rem;
        padding: 0.95rem;
        font-size: clamp(0.92rem, 3.75vw, 1rem);
        line-height: 1.55;
        border-radius: 12px;
    }

    body.classroom-page .chalkboard-rich-editor h1 {
        font-size: 1.35rem;
    }

    body.classroom-page .chalkboard-rich-editor h2 {
        font-size: 1.18rem;
    }

    body.classroom-page .chalkboard-rich-editor h3,
    body.classroom-page .chalkboard-rich-editor h4 {
        font-size: 1.03rem;
    }

    body.classroom-page .chalkboard-rich-editor ul,
    body.classroom-page .chalkboard-rich-editor ol {
        padding-left: 1.35rem;
    }

    body.classroom-page .chalkboard-rich-editor li {
        margin-bottom: 0.38rem;
    }

    body.classroom-page .chalkboard-panel-help {
        font-size: 0.78rem;
        line-height: 1.35;
    }

    .teacher-dashboard-page .container {
        margin-top: 1.1rem !important;
    }

    .teacher-dashboard-page h2 {
        font-size: clamp(1.45rem, 7vw, 1.9rem);
        line-height: 1.12;
    }

    .teacher-dashboard-page form.d-flex {
        display: block !important;
    }

    .teacher-dashboard-page .xtra-dashboard-card-grid {
        --bs-gutter-x: 0.85rem;
        --bs-gutter-y: 0.85rem;
    }

    .teacher-dashboard-page .xtra-dashboard-card-grid > [class*="col-"] {
        flex: 0 0 100%;
        width: 100%;
        max-width: 100%;
    }

    .teacher-dashboard-page .dashboard-card {
        min-height: 0;
        border-radius: 12px !important;
    }

    .teacher-dashboard-page .dashboard-card .card-body {
        padding: 0.9rem !important;
    }

    .teacher-dashboard-page .dashboard-card .card-title {
        font-size: 1.08rem;
        margin-bottom: 0.35rem;
    }

    .teacher-dashboard-page .dashboard-card p {
        font-size: 0.92rem;
        line-height: 1.4;
    }

    .teacher-dashboard-page .card.mt-5 {
        margin-top: 1.25rem !important;
    }

    .lesson-transcript-panel .xtra-help-note {
        max-height: 15rem;
    }
}

@media (max-width: 560px) {
    .xtra-subject-admin {
        max-width: 100%;
    }

    .xtra-subject-hero,
    .xtra-subject-section-head,
    .xtra-subject-directory-head,
    .xtra-subject-card-summary,
    .xtra-subject-details-grid,
    .xtra-subject-create-form {
        grid-template-columns: 1fr;
    }

    .xtra-subject-hero-actions,
    .xtra-subject-create-actions {
        justify-content: flex-start;
    }

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

    .xtra-subject-card {
        padding: 1rem;
        border-left-width: 0.32rem;
    }

    .xtra-subject-teacher-pills,
    .xtra-teacher-access-list {
        grid-template-columns: 1fr;
        max-height: 12rem;
    }

    .xtra-subject-pill,
    .xtra-teacher-access-row {
        width: 100%;
    }

    .xtra-classroom-students-card .xtra-classroom-student-row {
        gap: 0.5rem;
    }

    .xtra-classroom-student-copy strong,
    .xtra-classroom-student-copy span {
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .xtra-classroom-student-status {
        margin-top: 0;
    }

    .xtra-classroom-student-actions {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .xtra-classroom-student-actions .btn {
        min-height: 1.9rem;
        padding: 0.26rem 0.5rem;
        font-size: 0.76rem;
    }
}

@media (max-width: 420px) {
    .xtra-classroom-student-actions {
        grid-template-columns: 1fr;
    }

    .container,
    .container-fluid {
        padding-left: 0.78rem;
        padding-right: 0.78rem;
    }

    .card {
        padding: 0.85rem !important;
    }

    .btn:not(.btn-sm),
    .form-control,
    .form-select {
        width: 100%;
    }

    .badge {
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .table-responsive > .table,
    table.table {
        min-width: 560px;
    }
}
.xtra-notification-summary {
    cursor: pointer;
    list-style: none;
    user-select: none;
}

.xtra-notification-summary::-webkit-details-marker {
    display: none;
}

.xtra-notification-summary::after {
    content: "+";
    float: right;
    display: inline-grid;
    width: 1.65rem;
    height: 1.65rem;
    margin-inline-start: 0.75rem;
    place-items: center;
    border: 1px solid currentColor;
    border-radius: 50%;
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1;
}

details[open] > .xtra-notification-summary::after {
    content: "\2212";
}