:root {
    /* Flat palette — solid surfaces, no depth */
    --bg: #121a1d;
    --surface: #1c272b;
    --surface-2: #243137;
    --ink: #f2f5f3;
    --ink-muted: #9aada8;
    --accent: #f0b429;
    --accent-press: #d9a020;
    --line: #2e3b40;
    --danger-bg: #3a2220;
    --danger-ink: #f0b4a8;
    --danger-line: #7a4038;
    --ok-bg: #1e3228;
    --ok-ink: #b5e0c4;
    --ok-line: #3d6a4e;
    --font-display: "Space Grotesk", "Sora", sans-serif;
    --font-body: "Sora", sans-serif;
    --space-page: 1rem;
    --header-h: 3.5rem;
    --touch: 2.75rem;
    --radius: 0;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--ink);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

img,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ——— Header ——— */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: calc(var(--header-h) + var(--safe-top));
    padding:
        calc(0.75rem + var(--safe-top))
        calc(var(--space-page) + var(--safe-right))
        0.75rem
        calc(var(--space-page) + var(--safe-left));
    background: var(--surface);
    border-bottom: 2px solid var(--line);
    pointer-events: none;
}

.site-header > * {
    pointer-events: auto;
}

.site-header__start {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
}

.site-back {
    flex-shrink: 0;
    min-height: 2.5rem;
    padding: 0.4rem 0.75rem;
    border: 2px solid var(--line);
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
}

.site-back:active {
    background: var(--surface);
    color: var(--accent);
}

.site-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1;
    color: var(--ink);
}

.site-title:active {
    color: var(--accent);
}

@media (hover: hover) and (pointer: fine) {
    .site-back:hover {
        background: var(--surface);
        color: var(--accent);
    }
}

.site-menu {
    position: relative;
}

.site-menu__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-width: var(--touch);
    min-height: var(--touch);
    padding: 0.5rem 0.85rem;
    border: 2px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-2);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.site-menu.is-open .site-menu__toggle {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
}

.site-menu__toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.site-menu__chevron {
    width: 0.4rem;
    height: 0.4rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translateY(-1px) rotate(45deg);
}

.site-menu.is-open .site-menu__chevron {
    transform: translateY(1px) rotate(225deg);
}

.site-menu__list {
    position: absolute;
    top: calc(100% + 0.35rem);
    right: 0;
    width: min(18rem, calc(100vw - (2 * var(--space-page)) - var(--safe-left) - var(--safe-right)));
    margin: 0;
    padding: 0;
    list-style: none;
    border: 2px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
}

.site-menu__link {
    display: flex;
    align-items: center;
    min-height: var(--touch);
    padding: 0.65rem 0.9rem;
    border-bottom: 2px solid var(--line);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--ink);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.site-menu__list li:last-child .site-menu__link {
    border-bottom: 0;
}

.site-menu__link:active,
.site-menu__link.active {
    background: var(--surface-2);
    color: var(--accent);
}

.site-menu__link--button {
    width: 100%;
    border: 0;
    border-radius: 0;
    background: transparent;
    text-align: left;
    cursor: pointer;
    font: inherit;
    color: inherit;
}

/* ——— Home / Hero ——— */

.home {
    min-height: 100vh;
    min-height: 100dvh;
}

.page--home-courses {
    padding-top: 1rem;
}

.page--home-courses .page__panel {
    margin-top: 0;
    border-radius: 0;
}

.hero {
    position: relative;
    min-height: 0;
    display: grid;
    align-items: start;
    overflow: hidden;
    background: var(--bg);
}

.hero__media {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero__image {
    position: absolute;
    inset: 0;
    background:
        url("https://images.unsplash.com/photo-1456513080880-7d93aaa2ba7d?auto=format&fit=crop&w=1200&q=70")
        center / cover no-repeat;
}

.hero__veil {
    position: absolute;
    inset: 0;
    background: rgba(18, 26, 29, 0.78);
}

.hero__content {
    position: relative;
    z-index: 1;
    width: 100%;
    margin: 0;
    padding:
        calc(var(--header-h) + var(--safe-top) + 1rem)
        calc(var(--space-page) + var(--safe-right))
        1.5rem
        calc(var(--space-page) + var(--safe-left));
}

.hero__brand {
    margin: 0 0 0.65rem;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 0.95;
    color: var(--ink);
}

.hero__headline {
    margin: 0 0 0.75rem;
    max-width: 14ch;
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 500;
    font-style: normal;
    line-height: 1.25;
    color: var(--accent);
}

.hero__lede {
    margin: 0 0 1.5rem;
    max-width: 32ch;
    font-size: 0.98rem;
    line-height: 1.5;
    color: var(--ink-muted);
}

.hero__actions {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    width: 100%;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: var(--touch);
    padding: 0.85rem 1.15rem;
    border: 2px solid transparent;
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn--primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
}

.btn--primary:active {
    background: var(--accent-press);
    border-color: var(--accent-press);
}

.btn--ghost {
    background: transparent;
    border-color: var(--ink);
    color: var(--ink);
}

.btn--ghost:active {
    background: var(--surface-2);
}

.btn--danger {
    background: var(--danger-bg);
    border-color: var(--danger-line);
    color: var(--danger-ink);
}

.btn--danger:active {
    background: #4a2a27;
}

.reveal,
.reveal.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
}

/* ——— Auth / Login ——— */

.auth {
    min-height: 100vh;
    min-height: 100dvh;
    display: grid;
    align-items: center;
    padding:
        calc(var(--header-h) + var(--safe-top) + 1.5rem)
        calc(var(--space-page) + var(--safe-right))
        calc(1.5rem + var(--safe-bottom))
        calc(var(--space-page) + var(--safe-left));
    background: var(--bg);
}

.auth__panel {
    width: 100%;
    max-width: 24rem;
    margin-inline: auto;
    padding: 1.25rem;
    background: var(--surface);
    border: 2px solid var(--line);
}

.auth__eyebrow {
    margin: 0 0 0.4rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.auth__title {
    margin: 0 0 0.5rem;
    font-family: var(--font-display);
    font-size: 2.1rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1;
    color: var(--ink);
}

.auth__lede {
    margin: 0 0 1.25rem;
    font-size: 0.95rem;
    line-height: 1.45;
    color: var(--ink-muted);
}

.auth__error {
    margin: 0 0 1rem;
    padding: 0.75rem 0.9rem;
    border: 2px solid var(--danger-line);
    border-radius: var(--radius);
    background: var(--danger-bg);
    color: var(--danger-ink);
    font-size: 0.9rem;
    line-height: 1.4;
}

.auth__form {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.auth__field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.auth__label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ink-muted);
}

.auth__optional {
    font-weight: 400;
    color: #6f8180;
}

.auth__input {
    width: 100%;
    min-height: var(--touch);
    padding: 0.7rem 0.85rem;
    border: 2px solid var(--line);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
}

.auth__input::placeholder {
    color: #5f7270;
}

.auth__input:focus {
    border-color: var(--accent);
}

.auth__input--area {
    min-height: 6.5rem;
    resize: vertical;
    padding-top: 0.85rem;
}

.auth__input--file {
    padding: 0.45rem;
    font-size: 0.9rem;
}

.auth__input--file::file-selector-button {
    margin-right: 0.75rem;
    min-height: 2.25rem;
    padding: 0.35rem 0.75rem;
    border: 2px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-2);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
}

.auth__check {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    min-height: var(--touch);
    font-size: 0.95rem;
    color: var(--ink-muted);
    cursor: pointer;
}

.auth__check input {
    width: 1.15rem;
    height: 1.15rem;
    accent-color: var(--accent);
}

.auth__submit {
    margin-top: 0.25rem;
}

/* ——— Pages ——— */

.page {
    min-height: 100vh;
    min-height: 100dvh;
    padding:
        calc(var(--header-h) + var(--safe-top) + 1.25rem)
        calc(var(--space-page) + var(--safe-right))
        calc(1.5rem + var(--safe-bottom))
        calc(var(--space-page) + var(--safe-left));
    background: var(--bg);
}

.page__panel {
    width: 100%;
    max-width: 28rem;
    margin-inline: auto;
    padding: 1.25rem;
    background: var(--surface);
    border: 2px solid var(--line);
}

.page__file-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent);
    word-break: break-all;
}

.page__success {
    margin: 0 0 1rem;
    padding: 0.75rem 0.9rem;
    border: 2px solid var(--ok-line);
    border-radius: var(--radius);
    background: var(--ok-bg);
    color: var(--ok-ink);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* ——— Tablet+ ——— */

@media (min-width: 640px) {
    :root {
        --space-page: 1.5rem;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .site-title:hover {
        color: var(--accent);
    }

    .site-menu__toggle:hover {
        background: var(--accent);
        border-color: var(--accent);
        color: var(--bg);
    }

    .site-menu__list {
        width: auto;
        min-width: 14rem;
    }

    .site-menu__link:hover {
        background: var(--surface-2);
        color: var(--accent);
    }

    .hero__image {
        background-image:
            url("https://images.unsplash.com/photo-1456513080880-7d93aaa2ba7d?auto=format&fit=crop&w=1800&q=75");
    }

    .hero__content {
        width: min(40rem, 100%);
        padding-bottom: 1.75rem;
    }

    .hero__brand {
        font-size: 3.35rem;
    }

    .hero__headline {
        font-size: 1.85rem;
        max-width: 16ch;
    }

    .hero__lede {
        font-size: 1.05rem;
    }

    .hero__actions {
        flex-direction: row;
        flex-wrap: wrap;
        width: auto;
        gap: 0.75rem;
    }

    .btn {
        width: auto;
        min-width: 10rem;
    }

    .btn--primary:hover {
        background: var(--accent-press);
        border-color: var(--accent-press);
    }

    .btn--ghost:hover {
        background: var(--surface-2);
    }

    .btn--danger:hover {
        background: #4a2a27;
    }

    .auth__panel,
    .page__panel {
        max-width: 28rem;
        padding: 1.5rem;
    }

    .auth__title {
        font-size: 2.5rem;
    }
}

@media (min-width: 960px) {
    :root {
        --space-page: 2.5rem;
        --header-h: 4rem;
    }

    .site-title {
        font-size: 1.7rem;
    }

    .hero__image {
        background-image:
            url("https://images.unsplash.com/photo-1456513080880-7d93aaa2ba7d?auto=format&fit=crop&w=2400&q=75");
    }

    .hero__content {
        width: min(44rem, calc(100% - 3rem));
        padding:
            calc(var(--header-h) + var(--safe-top) + 1.25rem)
            var(--space-page)
            2rem;
    }

    .hero__brand {
        font-size: 4.25rem;
    }

    .hero__headline {
        font-size: 2.35rem;
    }

    .hero__lede {
        font-size: 1.1rem;
        max-width: 34ch;
    }

    .page {
        padding-top: calc(var(--header-h) + var(--safe-top) + 2rem);
    }

    .page__panel {
        max-width: 32rem;
    }
}

/* ——— Browse lists ——— */

.page__panel--wide {
    max-width: 40rem;
}

.browse__head {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.browse__add {
    width: 100%;
}

.browse__filters {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-bottom: 1.25rem;
}

.browse__filter {
    width: 100%;
}

.browse__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.browse__item {
    padding: 1rem;
    background: var(--bg);
    border: 2px solid var(--line);
}

.browse__item-top {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 0.55rem;
}

.browse__type,
.browse__badge {
    display: inline-flex;
    align-items: center;
    min-height: 1.6rem;
    padding: 0.15rem 0.45rem;
    border: 2px solid var(--line);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--ink-muted);
}

.browse__badge {
    border-color: var(--accent);
    color: var(--accent);
}

.browse__item-title {
    margin: 0 0 0.25rem;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--ink);
}

.browse__item-course {
    margin: 0 0 0.55rem;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent);
}

.browse__item-desc {
    margin: 0 0 0.75rem;
    font-size: 0.92rem;
    line-height: 1.45;
    color: var(--ink-muted);
}

.browse__item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
    font-size: 0.8rem;
    color: var(--ink-muted);
}

.browse__item-actions {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.browse__action {
    width: 100%;
}

.browse__empty {
    margin: 0;
    color: var(--ink-muted);
    font-size: 0.95rem;
}

.browse__empty-block {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    align-items: stretch;
    padding: 0.5rem 0 0.25rem;
}

@media (min-width: 640px) {
    .browse__head {
        flex-direction: row;
        align-items: flex-end;
        justify-content: space-between;
    }

    .browse__add {
        width: auto;
        min-width: 9.5rem;
        flex-shrink: 0;
    }

    .browse__filters {
        flex-direction: row;
        align-items: end;
    }

    .browse__filter {
        flex: 1;
    }

    .browse__filter--search {
        flex: 1.35;
    }

    .browse__item-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .browse__action {
        width: auto;
        min-width: 8.5rem;
    }

    .page__panel--wide {
        max-width: 44rem;
    }
}

@media (min-width: 960px) {
    .page__panel--wide {
        max-width: 52rem;
    }
}

.structure-nav {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    margin: 1rem 0 1.25rem;
}

.structure-form {
    margin-bottom: 1.25rem;
    padding: 1rem;
    border: 2px solid var(--line);
    background: var(--bg);
}

.structure-form__title {
    margin: 0 0 0.85rem;
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--ink);
}

.structure-form__actions {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.auth__input--tall {
    min-height: 10rem;
}

@media (min-width: 640px) {
    .structure-nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .structure-nav .btn {
        width: auto;
        min-width: 9rem;
    }

    .structure-form__actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .structure-form__actions .btn {
        width: auto;
        min-width: 8rem;
    }
}

.article-add {
    margin-bottom: 1.25rem;
}

.article-add__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.55rem;
    margin-top: 0.45rem;
}

.article-blocks {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.article-block {
    padding: 1rem;
    border: 2px solid var(--line);
    background: var(--bg);
}

.article-block__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 0.75rem;
}

.lesson-article {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lesson-article__subtitle {
    margin: 0.5rem 0 0;
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--accent);
}

.lesson-article__text {
    margin: 0;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--ink);
    white-space: pre-wrap;
}

.lesson-article__bullets {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--ink);
    line-height: 1.6;
}

.lesson-article__bullets li + li {
    margin-top: 0.35rem;
}

.lesson-article__figure {
    margin: 0;
}

.lesson-article__image {
    width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border: 2px solid var(--line);
    background: var(--surface);
}

.lesson-article__caption {
    display: block;
    margin-top: 0.45rem;
    font-size: 0.88rem;
    color: var(--ink-muted);
}

.lesson-article__link {
    color: var(--accent);
    font-weight: 600;
    text-decoration: underline;
    word-break: break-all;
}

.lesson-article__video {
    margin: 0;
}

.lesson-article__embed {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 2px solid var(--line);
    background: var(--surface);
    overflow: hidden;
}

.lesson-article__embed iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.lesson-article__player {
    display: block;
    width: 100%;
    max-height: 70vh;
    border: 2px solid var(--line);
    background: var(--surface);
}

.lesson-article__file {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    margin: 0;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.quiz-options__row {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.quiz-options__correct {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.88rem;
    color: var(--ink-muted);
}

.quiz-options__preview {
    margin: 0 0 0.85rem;
    padding-left: 1.15rem;
    color: var(--ink);
    line-height: 1.5;
}

.quiz-options__preview li {
    margin-top: 0.35rem;
}

.quiz-options__preview li.is-correct {
    font-weight: 600;
    color: var(--accent);
}

.quiz-take {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.quiz-take__head {
    margin-bottom: 0.25rem;
}

.quiz-take__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem 1rem;
    margin-top: 0.35rem;
}

.quiz-take__taker,
.quiz-take__progress {
    margin: 0;
    font-size: 0.92rem;
    color: var(--ink-muted);
}

.quiz-take__taker {
    font-weight: 600;
    color: var(--ink);
}

.quiz-take__progress {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--accent);
}

.quiz-card {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    padding: 1.1rem;
    border: 2px solid var(--line);
    background: var(--bg);
}

.quiz-card--answered {
    border-color: var(--accent);
}

.quiz-card__head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.45rem;
}

.quiz-card__number {
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
}

.quiz-card__status {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--ink-muted);
}

.quiz-card--answered .quiz-card__status {
    color: var(--accent);
}

.quiz-card__prompt {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.02em;
    color: var(--ink);
}

.quiz-card__options {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.quiz-card__option {
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    min-height: var(--touch);
    padding: 0.8rem 0.9rem;
    border: 2px solid var(--line);
    background: var(--surface);
    color: var(--ink);
    line-height: 1.45;
    cursor: pointer;
}

.quiz-card__option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.quiz-card__option-mark {
    flex-shrink: 0;
    width: 1.1rem;
    height: 1.1rem;
    margin-top: 0.15rem;
    border: 2px solid var(--line);
    background: var(--bg);
}

.quiz-card__option.is-selected {
    border-color: var(--accent);
    background: var(--surface-2);
}

.quiz-card__option.is-selected .quiz-card__option-mark {
    border-color: var(--accent);
    background: var(--accent);
}

.quiz-card__option-text {
    flex: 1;
    min-width: 0;
}

.quiz-take__submit {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    margin-top: 0.35rem;
    padding-top: 0.35rem;
}

.quiz-tools {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 0.25rem;
    padding-top: 0.85rem;
    border-top: 2px solid var(--line);
}

.quiz-tools__notes-input {
    min-height: 6.5rem;
    resize: vertical;
}

.quiz-tools__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    min-height: 2.75rem;
    margin-bottom: 0.65rem;
    padding: 0.55rem 0.85rem;
    border: 2px solid var(--line);
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 0.92rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
}

.quiz-tools__toggle[aria-expanded="true"] {
    margin-bottom: 0.65rem;
}

.quiz-tools__toggle-hint {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--ink-muted);
}

.quiz-calc {
    border: 2px solid var(--line);
    background: var(--bg);
    padding: 0.75rem;
    max-width: 16rem;
}

.quiz-calc__display {
    margin-bottom: 0.65rem;
    padding: 0.65rem 0.75rem;
    border: 2px solid var(--line);
    background: var(--surface);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    text-align: right;
    word-break: break-all;
    color: var(--ink);
}

.quiz-calc__keys {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.45rem;
}

.quiz-calc__key {
    min-height: 2.75rem;
    border: 2px solid var(--line);
    background: var(--surface);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.quiz-calc__key:hover {
    background: var(--bg);
}

.quiz-calc__key--muted {
    color: var(--ink-muted);
}

.quiz-calc__key--op {
    color: var(--accent);
}

.quiz-calc__key--eq {
    grid-row: span 2;
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.quiz-calc__key--eq:hover {
    filter: brightness(0.95);
    background: var(--accent);
}

.quiz-calc__key--zero {
    grid-column: span 2;
}

.quiz-score {
    font-weight: 700;
    color: var(--accent);
}

.quiz-schedule {
    margin: 0 0 0.85rem;
    padding: 0.7rem 0.85rem;
    border: 2px solid var(--line);
    background: var(--bg);
    font-size: 0.92rem;
    color: var(--ink);
}

.quiz-timer-bar {
    position: fixed;
    top: calc(var(--header-h) + var(--safe-top));
    left: 0;
    right: 0;
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    min-height: 3.25rem;
    padding: 0.55rem 1rem;
    border-bottom: 2px solid var(--line);
    background: var(--surface);
}

.quiz-timer-bar__label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-muted);
}

.quiz-timer-bar__value {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.quiz-timer-bar--urgent {
    min-height: 4.5rem;
    padding: 0.75rem 1rem;
    background: var(--accent);
    border-bottom-color: var(--accent);
}

.quiz-timer-bar--urgent .quiz-timer-bar__label {
    color: rgba(255, 255, 255, 0.85);
}

.quiz-timer-bar--urgent .quiz-timer-bar__value {
    font-size: 2.25rem;
    color: #fff;
}

.page--quiz-timed {
    padding-top: calc(var(--header-h) + var(--safe-top) + 3.75rem + 1.25rem);
}

.page--quiz-timed:has(.quiz-timer-bar--urgent) {
    padding-top: calc(var(--header-h) + var(--safe-top) + 5.25rem + 1.25rem);
}

@media (min-width: 640px) {
    .quiz-timer-bar {
        flex-direction: row;
        gap: 0.75rem;
        min-height: 3.5rem;
        padding: 0.65rem 1.25rem;
    }

    .quiz-timer-bar__value {
        font-size: 1.5rem;
    }

    .quiz-timer-bar--urgent {
        min-height: 5rem;
    }

    .quiz-timer-bar--urgent .quiz-timer-bar__value {
        font-size: 2.75rem;
    }

    .page--quiz-timed {
        padding-top: calc(var(--header-h) + var(--safe-top) + 4rem + 2rem);
    }

    .page--quiz-timed:has(.quiz-timer-bar--urgent) {
        padding-top: calc(var(--header-h) + var(--safe-top) + 5.5rem + 2rem);
    }
}

.quiz-result--ok {
    border-color: var(--accent);
}

.quiz-result--miss .browse__badge {
    background: var(--danger, #b42318);
    color: #fff;
}

@media (min-width: 640px) {
    .quiz-options__row {
        flex-direction: row;
        align-items: center;
    }

    .quiz-options__row .auth__input {
        flex: 1;
    }

    .quiz-tools {
        display: grid;
        grid-template-columns: 1.4fr 1fr;
        gap: 1.15rem;
        align-items: start;
    }

    .quiz-card {
        padding: 1.35rem;
        gap: 1rem;
    }

    .quiz-card__prompt {
        font-size: 1.35rem;
    }

    .quiz-take__submit {
        flex-direction: row;
    }

    .quiz-take__submit .btn {
        width: auto;
        min-width: 12rem;
    }
}

@media (min-width: 640px) {
    .article-add__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .article-add__grid .btn {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}