/* Gemeinsame visuelle Basis; seitenspezifische Layouts bleiben unverändert. */
:root {
    color-scheme: light;
    --app-primary: #357fca;
    --app-primary-strong: #2468aa;
    --app-primary-soft: #eaf3fc;
    --app-bg: #f4f7fa;
    --app-surface: #fff;
    --app-text: #243447;
    --app-text-muted: #607286;
    --app-border: #d8e1ea;
    --app-radius-sm: 8px;
    --app-radius: 12px;
    --app-shadow-sm: 0 2px 8px rgba(36, 52, 71, .08);
    --app-focus: 0 0 0 3px rgba(53, 127, 202, .22);
    --app-transition: 160ms ease;
}

html { background: var(--app-bg); }

body {
    background-color: var(--app-bg);
    color: var(--app-text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.55;
    text-rendering: optimizeLegibility;
}

::selection { background: rgba(53, 127, 202, .22); }

a {
    color: var(--app-primary-strong);
    text-decoration-thickness: 1px;
    text-underline-offset: .18em;
}

a:hover { color: var(--app-primary); }

:where(a, button, input, select, textarea, summary):focus-visible {
    outline: 2px solid var(--app-primary);
    outline-offset: 2px;
    box-shadow: var(--app-focus);
}

:where(button, input, select, textarea) { font: inherit; }

:where(img, video, canvas, svg, iframe) {
    max-width: 100%;
}

:where(pre, code) {
    max-width: 100%;
}

:where(input:not([type="checkbox"]):not([type="radio"]), select, textarea) {
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius-sm);
    background: var(--app-surface);
    color: var(--app-text);
    transition: border-color var(--app-transition), box-shadow var(--app-transition), background-color var(--app-transition);
}

:where(input:not([type="checkbox"]):not([type="radio"]), select, textarea):hover {
    border-color: #afbfce;
}

:where(input:not([type="checkbox"]):not([type="radio"]), select, textarea):focus {
    border-color: var(--app-primary);
    outline: none;
    box-shadow: var(--app-focus);
}

:where(button, .btn, .button, .back-button, .action-button) {
    border-radius: var(--app-radius-sm);
    transition: transform var(--app-transition), box-shadow var(--app-transition), background-color var(--app-transition), border-color var(--app-transition);
}

:where(button, .btn, .button, .back-button, .action-button):not(:disabled):hover {
    transform: translateY(-1px);
}

:where(button, .btn, .button, .back-button, .action-button):not(:disabled):active {
    transform: translateY(0);
}

:where(button, input, select, textarea):disabled {
    cursor: not-allowed;
    opacity: .62;
}

header,
.header {
    background: linear-gradient(135deg, #69a9df 0%, var(--app-primary) 58%, var(--app-primary-strong) 100%);
    box-shadow: 0 4px 18px rgba(36, 104, 170, .18);
}

.user-nav,
.navigation {
    background: #edf5fc;
    border-color: var(--app-border);
}

:where(.card, .panel, .box, .widget, .legal-content, .form-container, .content-card) {
    border-color: var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow-sm);
}

.math-button,
.content-card {
    background: linear-gradient(145deg, var(--app-surface) 0%, #fbfdff 100%);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow-sm);
}

.math-button:hover,
.content-card:hover {
    border-color: #9fc1e1;
    box-shadow: 0 12px 26px rgba(36, 104, 170, .14);
}

.math-button a { color: var(--app-text); }

.math-button a:hover {
    background: linear-gradient(145deg, #f8fbff, var(--app-primary-soft));
    color: var(--app-primary-strong);
}

table { color: var(--app-text); }

th {
    background-color: var(--app-primary-soft);
    color: var(--app-text);
}

tr:nth-child(even) td { background-color: rgba(234, 243, 252, .34); }

hr {
    border: 0;
    border-top: 1px solid var(--app-border);
}

footer {
    border-color: var(--app-border);
    color: var(--app-text-muted);
}

body.dark-mode {
    color-scheme: dark;
    --app-primary: #72b3ed;
    --app-primary-strong: #9bcaf3;
    --app-primary-soft: #233c54;
    --app-bg: #18212b;
    --app-surface: #222e3a;
    --app-text: #e5edf4;
    --app-text-muted: #adbdca;
    --app-border: #3b4d5e;
    --app-shadow-sm: 0 2px 9px rgba(0, 0, 0, .24);
    --app-focus: 0 0 0 3px rgba(114, 179, 237, .24);
}

body.dark-mode :where(input:not([type="checkbox"]):not([type="radio"]), select, textarea) {
    background: var(--app-surface);
    border-color: var(--app-border);
    color: var(--app-text);
}

body.dark-mode :where(.card, .panel, .box, .widget, .legal-content, .form-container, .content-card) {
    background-color: var(--app-surface);
    border-color: var(--app-border);
    color: var(--app-text);
}

body.dark-mode .math-button,
body.dark-mode .content-card {
    background: linear-gradient(145deg, var(--app-surface), #263644);
    border-color: var(--app-border);
}

body.dark-mode .math-button a { color: var(--app-text); }

body.dark-mode .math-button a:hover {
    background: var(--app-primary-soft);
    color: var(--app-primary-strong);
}

body.dark-mode tr:nth-child(even) td { background-color: rgba(114, 179, 237, .06); }

/* Umschalter für die Admin-Vorschau auf Lehrer-Seiten. */
.admin-view-switch {
    position: absolute;
    top: 50%;
    right: clamp(18px, 3vw, 42px);
    transform: translateY(-50%);
    margin: 0;
}

.admin-view-switch button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    border: 1px solid rgba(255,255,255,.55);
    border-radius: 999px;
    background: rgba(15,63,112,.3);
    color: #fff;
    cursor: pointer;
    font: inherit;
    box-shadow: 0 4px 14px rgba(15,63,112,.24);
    backdrop-filter: blur(8px);
    transition: background-color .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.admin-view-switch button:hover {
    background: rgba(15,63,112,.42);
    border-color: rgba(255,255,255,.78);
    box-shadow: 0 6px 18px rgba(15,63,112,.3);
}

.admin-view-switch button:focus-visible {
    outline: 3px solid #fff;
    outline-offset: 3px;
}

.admin-view-label {
    font-size: .78rem;
    font-weight: 600;
    opacity: .72;
}

.admin-view-label.active { opacity: 1; }

.admin-view-track {
    position: relative;
    width: 46px;
    height: 24px;
    border-radius: 999px;
    background: rgba(255,255,255,.38);
    box-shadow: inset 0 1px 3px rgba(15,63,112,.28);
}

.admin-view-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 2px 5px rgba(15,63,112,.35);
    transition: transform .2s ease;
}

.admin-view-switch.is-lehrer .admin-view-knob { transform: translateX(22px); }

/* Im Loginbereich sitzt der Ansichtsumschalter im Desktop-Browser rechts im Kopfbereich. */
.login-header-account {
    position: static;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.login-header-account .admin-view-switch {
    position: absolute;
    top: 50%;
    right: clamp(18px, 3vw, 42px);
    transform: translateY(-50%);
    margin: 0;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media (max-width: 700px) {
    :root { --app-radius: 10px; }
    body {
        min-width: 0;
        line-height: 1.5;
        overflow-wrap: anywhere;
    }

    :where(main, section, article, aside, header, footer, nav, form, fieldset,
        .page, .container, .wrapper, .wrap, .card, .panel, .box, .widget,
        .content-card, .content-grid, .grid) {
        min-width: 0;
        max-width: 100%;
    }

    :where(.row, .toolbar, .actions, .filters, .controls, .button-row, .navlinks) {
        min-width: 0;
        max-width: 100%;
        flex-wrap: wrap;
    }

    :where(.row, .toolbar, .actions, .filters, .controls, .button-row, .navlinks) > * {
        min-width: 0;
        max-width: 100%;
    }

    :where(button, input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]),
        select, textarea, summary, [role="button"], .btn, .button, .back-button,
        .action-button, .content-link) {
        min-height: 44px;
    }

    :where(button, [role="button"], .btn, .button, .back-button, .action-button) {
        min-width: 44px;
    }

    :where(input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]), select, textarea) {
        max-width: 100%;
        font-size: 16px;
    }

    :where(input[type="checkbox"], input[type="radio"]) {
        width: 22px;
        height: 22px;
        min-width: 22px;
        min-height: 22px;
    }

    :where(nav a, .user-nav a, .navigation a, .nav-bar a, .navlinks a,
        .back, .back-link, footer a) {
        display: inline-flex;
        align-items: center;
        min-height: 44px;
        padding-block: 6px;
    }

    table {
        display: block;
        width: 100%;
        max-width: 100%;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        -webkit-overflow-scrolling: touch;
    }

    :where(th, td, label, .card, .panel, .content-card) {
        overflow-wrap: anywhere;
    }

    pre {
        overflow-x: auto;
        white-space: pre;
        overflow-wrap: normal;
    }

    :where(dialog, [role="dialog"], .modal-card, .modal-content, .dialog-content, .anh-dialog) {
        max-width: calc(100vw - 16px);
        max-height: calc(100dvh - 16px);
    }

    .toast-container {
        right: 12px;
        left: 12px;
        max-width: calc(100vw - 24px);
    }

    .toast {
        min-width: 0;
        max-width: 100%;
    }
}

@media (max-width: 992px) {
    .admin-view-switch {
        position: static;
        transform: none;
        display: flex;
        justify-content: center;
        margin-top: 14px;
    }

    .login-header-account {
        flex-direction: column;
        gap: 8px;
    }

    .login-header-account .admin-view-switch {
        position: static;
        transform: none;
        margin-top: 0;
    }
}