/* ============================================================
   ХимПодготовка — Органическая химия, 10 класс
   Единая дизайн-система интерактивного курса.
   Подключается ПОСЛЕ style.css и наследует её токены.
   ============================================================ */

:root {
    --c10-ink: #16202e;
    --c10-ink-soft: #5a6a7b;
    --c10-paper: #ffffff;
    --c10-bg: #f5f3ef;
    --c10-line: #e8e4de;
    --c10-line-soft: #f0ece6;

    --c10-brand: #f5a623;
    --c10-brand-dark: #d47a10;
    --c10-brand-tint: #fff4e0;

    /* Смысловая палитра курса — закреплена за типами блоков.
       Не переопределять на страницах тем: цвет = значение. */
    --c10-def: #f59e0b;          /* определение   */
    --c10-mech: #8b5cf6;         /* механизм      */
    --c10-lab: #0ea5e9;          /* опыт / практика */
    --c10-warn: #ef4444;         /* исключение    */
    --c10-ok: #10b981;           /* верно / вывод */
    --c10-exam: #6366f1;         /* «на ЕГЭ»      */

    --c10-r-sm: 10px;
    --c10-r-md: 14px;
    --c10-r-lg: 20px;
    --c10-r-xl: 28px;

    --c10-sh-sm: 0 1px 3px rgba(22, 32, 46, .05), 0 1px 2px rgba(22, 32, 46, .04);
    --c10-sh-md: 0 6px 20px rgba(22, 32, 46, .07), 0 2px 6px rgba(22, 32, 46, .04);
    --c10-sh-lg: 0 18px 45px rgba(22, 32, 46, .10), 0 6px 14px rgba(22, 32, 46, .05);

    --c10-ease: cubic-bezier(.4, 0, .2, 1);
    --c10-maxw: 860px;
}

/* ============================================================
   00. СОВМЕСТИМОСТЬ СО style.css

   В style.css body — это flex-контейнер, а main/aside/h1 имеют
   готовое оформление «бумажной» страницы. Курс верстается сеткой
   и своими блоками, поэтому эти правила здесь гасятся точечно.
   ============================================================ */

body.c10-body { background-color: var(--c10-bg); }

/* margin:0 auto в колоночном flex-контейнере отменяет растягивание,
   поэтому ширину задаём явно. */
.c10-layout,
.c10-hub { width: 100%; }

/* main и aside не должны выглядеть как отдельные «карточки»:
   фон и отступы дают внутренние блоки темы. */
main.c10-main {
    background: none;
    border: 0;
    box-shadow: none;
    padding: 0;
    border-radius: 0;
}

/* В style.css aside скрыт по умолчанию и показывается только
   для body.with-sidebar — оглавлению курса это нужно вернуть. */
aside.c10-toc {
    display: block;
    width: auto;
    min-width: 0;
    background: none;
    border: 0;
    box-shadow: none;
    padding: 0;
}

@media (max-width: 1000px) {
    aside.c10-toc { display: none; }
}

/* Заголовок героя не наследует оранжевую черту глобального h1. */
.c10-hero h1 {
    border-bottom: 0;
    padding-bottom: 0;
    font-family: var(--font-heading);
}

.c10-main h2, .c10-main h3 { font-family: var(--font-heading); }

/* Глобальный h2 из style.css рисует оранжевую полоску через ::before —
   в макете курса заголовок отделён собственной чертой снизу. */
.c10-main h2 { padding-left: 0; margin-top: 3rem; }
.c10-main h2::before { content: none; }
.c10-trainer__head h2 { border-bottom: 0; padding-bottom: 0; margin-top: 0; padding-left: 0; }
.c10-trainer__head h2::before { content: none; }

/* ============================================================
   0. ШАПКА САЙТА
   На остальных страницах эти правила лежат инлайном в каждом
   файле. Здесь шапку рисует shell.js, поэтому её стили нужны
   в общей таблице — иначе иконки остаются без размеров.
   ============================================================ */

header.site-header {
    display: flex;
    justify-content: center;
    padding: 0.8rem 4%;
    background: rgba(255, 255, 255, .98);
    border-bottom: 1px solid #e8ecf0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, .03);
    height: 70px;
}

header.site-header .header-content { display: flex; align-items: center; gap: 2rem; }

header.site-header .logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: #1a2332;
    text-decoration: none;
    white-space: nowrap;
}

header.site-header .logo span { color: #f5a623; }

.site-nav-container { display: flex; align-items: center; gap: .5rem; }

.site-header .nav-link {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .5rem 1rem;
    border-radius: 12px;
    text-decoration: none;
    font-size: .9rem;
    font-weight: 500;
    color: #5a6a7b;
    border: 1px solid transparent;
    transition: all .2s var(--c10-ease);
}

.site-header .nav-link svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    flex-shrink: 0;
    transition: transform .2s ease;
}

.site-header .nav-link:hover { color: #1a2332; background: #f0f2f5; transform: translateY(-1px); }
.site-header .nav-link:hover svg { transform: scale(1.1); stroke: #e8941a; }

.site-header .nav-link.active {
    background: #fff4e0;
    color: #d47a10;
    font-weight: 600;
    border-color: rgba(245, 166, 35, .2);
}

.site-header .nav-link.active svg { stroke: #d47a10; }

.mobile-menu-btn {
    display: none;
    background: none;
    border: 0;
    cursor: pointer;
    color: #1a2332;
    padding: .5rem;
}

.mobile-menu-btn svg { width: 28px; height: 28px; stroke: currentColor; fill: none; stroke-width: 2; }

@media (max-width: 900px) {
    header.site-header { justify-content: space-between; height: auto; }
    header.site-header .header-content { width: 100%; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
    .mobile-menu-btn { display: block; order: 2; }
    .site-nav-container {
        display: none;
        order: 3;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding-bottom: .6rem;
    }
    .site-nav-container.open { display: flex; }
}

/* ============================================================
   1. КАРКАС СТРАНИЦЫ ТЕМЫ
   ============================================================ */

.c10-layout {
    display: grid;
    grid-template-columns: 268px minmax(0, 1fr);
    gap: 2.5rem;
    max-width: 1240px;
    margin: 0 auto;
    padding: 2rem 1.5rem 5rem;
    align-items: start;
}

@media (max-width: 1000px) {
    .c10-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 0;
        padding: 1rem 1rem 4rem;
    }
}

.c10-main {
    min-width: 0;
    max-width: var(--c10-maxw);
}

/* --- Боковое оглавление со скроллспаем --- */
.c10-toc {
    position: sticky;
    top: 92px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-right: .5rem;
    scrollbar-width: thin;
}

.c10-toc::-webkit-scrollbar { width: 6px; }
.c10-toc::-webkit-scrollbar-thumb { background: var(--c10-line); border-radius: 99px; }

.c10-toc__title {
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--c10-ink-soft);
    margin: 0 0 .9rem;
}

.c10-toc__list { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--c10-line); }

.c10-toc__list a {
    display: block;
    padding: .42rem 0 .42rem .95rem;
    margin-left: -2px;
    border-left: 2px solid transparent;
    font-size: .875rem;
    line-height: 1.35;
    color: var(--c10-ink-soft);
    text-decoration: none;
    transition: color .18s var(--c10-ease), border-color .18s var(--c10-ease);
}

.c10-toc__list a:hover { color: var(--c10-ink); }

.c10-toc__list a.is-active {
    color: var(--c10-brand-dark);
    border-left-color: var(--c10-brand);
    font-weight: 700;
}

.c10-toc__list .is-sub a { padding-left: 1.7rem; font-size: .82rem; }

@media (max-width: 1000px) {
    .c10-toc { display: none; }
}

/* --- Полоса прогресса чтения --- */
.c10-readbar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0;
    background: linear-gradient(90deg, var(--c10-brand), var(--c10-brand-dark));
    z-index: 2000;
    transition: width .1s linear;
}

/* ============================================================
   2. ШАПКА ТЕМЫ
   ============================================================ */

.c10-hero {
    position: relative;
    overflow: hidden;
    border-radius: var(--c10-r-xl);
    padding: 2.4rem 2.2rem 2.1rem;
    margin-bottom: 2.2rem;
    background: linear-gradient(135deg, #1d2735 0%, #2a3648 55%, #1a2431 100%);
    color: #fff;
    box-shadow: var(--c10-sh-lg);
}

.c10-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
    background-size: 26px 26px;
    mask-image: radial-gradient(120% 100% at 85% 0%, #000 20%, transparent 75%);
    pointer-events: none;
}

.c10-hero::after {
    content: '';
    position: absolute;
    right: -70px;
    top: -70px;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(245, 166, 35, .35), transparent 65%);
    pointer-events: none;
}

.c10-hero > * { position: relative; z-index: 1; }

.c10-hero__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    font-size: .74rem;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--c10-brand);
    margin-bottom: .85rem;
}

.c10-hero__eyebrow::before {
    content: '';
    width: 22px;
    height: 2px;
    background: var(--c10-brand);
    border-radius: 2px;
}

.c10-hero h1 {
    margin: 0 0 .7rem;
    font-size: clamp(1.6rem, 3.6vw, 2.35rem);
    line-height: 1.18;
    font-weight: 800;
    color: #fff;
    letter-spacing: -.015em;
}

.c10-hero__lead {
    margin: 0;
    max-width: 60ch;
    font-size: 1.02rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, .78);
}

.c10-hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: .55rem;
    margin-top: 1.4rem;
}

.c10-chip {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .38rem .8rem;
    border-radius: 99px;
    font-size: .78rem;
    font-weight: 700;
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .16);
    color: rgba(255, 255, 255, .9);
    backdrop-filter: blur(6px);
}

.c10-chip svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; }

/* ============================================================
   3. ТЕКСТ КОНСПЕКТА
   ============================================================ */

.c10-main h2 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -.01em;
    color: var(--c10-ink);
    margin: 3rem 0 1rem;
    padding-bottom: .6rem;
    border-bottom: 2px solid var(--c10-line);
    scroll-margin-top: 100px;
}

.c10-main h3 {
    font-size: 1.13rem;
    font-weight: 700;
    color: var(--c10-ink);
    margin: 2rem 0 .7rem;
    scroll-margin-top: 100px;
}

.c10-main p { line-height: 1.72; color: #2c3a4b; margin: 0 0 1rem; }
.c10-main ul, .c10-main ol { line-height: 1.72; color: #2c3a4b; padding-left: 1.35rem; margin: 0 0 1.1rem; }
.c10-main li { margin-bottom: .45rem; }
.c10-main strong { color: var(--c10-ink); font-weight: 700; }

.c10-main a { color: var(--c10-brand-dark); text-decoration: underline; text-underline-offset: 2px; }

/* Химическая формула в тексте */
.c10-f {
    font-family: 'Cambria Math', 'Times New Roman', Georgia, serif;
    font-size: 1.04em;
    white-space: nowrap;
}

/* ============================================================
   4. СМЫСЛОВЫЕ БЛОКИ (callout)
   ============================================================ */

.c10-box {
    --box: var(--c10-def);
    position: relative;
    margin: 1.8rem 0;
    padding: 1.25rem 1.5rem 1.3rem;
    border: 1px solid var(--c10-line);
    border-left: 5px solid var(--box);
    border-radius: var(--c10-r-md);
    background: var(--c10-paper);
    box-shadow: var(--c10-sh-sm);
}

.c10-box--def { --box: var(--c10-def); background: linear-gradient(135deg, #fff 0%, #fffaf0 100%); }
.c10-box--mech { --box: var(--c10-mech); background: linear-gradient(135deg, #fff 0%, #faf7ff 100%); }
.c10-box--lab { --box: var(--c10-lab); background: linear-gradient(135deg, #fff 0%, #f2fbff 100%); }
.c10-box--warn { --box: var(--c10-warn); background: linear-gradient(135deg, #fff 0%, #fff6f6 100%); }
.c10-box--ok { --box: var(--c10-ok); background: linear-gradient(135deg, #fff 0%, #f3fdf9 100%); }
.c10-box--exam { --box: var(--c10-exam); background: linear-gradient(135deg, #fff 0%, #f6f7ff 100%); }

.c10-box__title {
    display: flex;
    align-items: center;
    gap: .5rem;
    margin: 0 0 .6rem;
    font-size: .74rem;
    font-weight: 800;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--box);
}

.c10-box__title svg { width: 15px; height: 15px; stroke: currentColor; fill: none; stroke-width: 2.2; }
.c10-box p:last-child, .c10-box ul:last-child, .c10-box ol:last-child { margin-bottom: 0; }

/* ============================================================
   5. ИНТЕРАКТИВНАЯ ВИЗУАЛИЗАЦИЯ
   ============================================================ */

.c10-viz {
    margin: 2.2rem 0;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-lg);
    background: var(--c10-paper);
    box-shadow: var(--c10-sh-md);
    overflow: hidden;
}

.c10-viz__head {
    display: flex;
    align-items: center;
    gap: .7rem;
    padding: .9rem 1.2rem;
    border-bottom: 1px solid var(--c10-line-soft);
    background: linear-gradient(180deg, #fbfaf8, #f7f5f1);
}

.c10-viz__badge {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .25rem .6rem;
    border-radius: 99px;
    font-size: .66rem;
    font-weight: 800;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: #fff;
    background: linear-gradient(135deg, var(--c10-mech), #6d4bd8);
    flex-shrink: 0;
}

.c10-viz__title { font-size: .95rem; font-weight: 700; color: var(--c10-ink); }

.c10-viz__stage {
    position: relative;
    background:
        radial-gradient(circle at 50% 0%, #223047 0%, #161f2c 70%);
    min-height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.c10-viz__stage canvas, .c10-viz__stage svg { max-width: 100%; display: block; }

.c10-viz__stage--light {
    background: linear-gradient(180deg, #fdfcfa, #f6f4f0);
}

.c10-viz__controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .6rem .9rem;
    padding: .95rem 1.2rem;
    border-top: 1px solid var(--c10-line-soft);
    background: #fbfaf8;
}

.c10-viz__caption {
    padding: .85rem 1.2rem;
    font-size: .86rem;
    line-height: 1.6;
    color: var(--c10-ink-soft);
    border-top: 1px solid var(--c10-line-soft);
    background: #fff;
}

/* --- Элементы управления --- */
.c10-btn {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .5rem .95rem;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-sm);
    background: #fff;
    color: var(--c10-ink);
    font: inherit;
    font-size: .85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all .18s var(--c10-ease);
}

.c10-btn:hover { border-color: var(--c10-brand); color: var(--c10-brand-dark); transform: translateY(-1px); }
.c10-btn:active { transform: translateY(0); }
.c10-btn svg { width: 15px; height: 15px; stroke: currentColor; fill: none; stroke-width: 2; }

.c10-btn--primary {
    background: linear-gradient(135deg, var(--c10-brand), var(--c10-brand-dark));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 14px rgba(245, 166, 35, .28);
}

.c10-btn--primary:hover { color: #fff; filter: brightness(1.05); }

.c10-btn.is-on {
    background: var(--c10-brand-tint);
    border-color: var(--c10-brand);
    color: var(--c10-brand-dark);
}

.c10-seg { display: inline-flex; border: 1px solid var(--c10-line); border-radius: var(--c10-r-sm); overflow: hidden; }
.c10-seg button {
    padding: .45rem .85rem;
    border: 0;
    border-right: 1px solid var(--c10-line);
    background: #fff;
    font: inherit;
    font-size: .82rem;
    font-weight: 600;
    color: var(--c10-ink-soft);
    cursor: pointer;
    transition: all .16s var(--c10-ease);
}
.c10-seg button:last-child { border-right: 0; }
.c10-seg button:hover { background: #faf8f4; }
.c10-seg button.is-on { background: var(--c10-brand); color: #fff; }

/* Три режима отображения в одну строку на телефон не помещаются:
   полосе нужно ~393 px, а в карточке их 276 — «Масштабная» уезжала
   за край и срезалась overflow: hidden, то есть третьего вида формулы
   на телефоне просто не было. Разрешаем перенос и растягиваем кнопки,
   чтобы переключатель остался цельным, а не рваным. */
@media (max-width: 560px) {
    .c10-viz__controls { gap: .5rem .7rem; padding: .8rem .9rem; }

    .c10-seg {
        display: flex;
        flex-wrap: wrap;
        width: 100%;
    }

    .c10-seg button {
        flex: 1 1 auto;
        padding: .5rem .6rem;
        font-size: .78rem;
        border-bottom: 1px solid var(--c10-line);
    }

    /* Нижняя граница нужна только между рядами, у последнего ряда её нет.
       Какая кнопка окажется последней в ряду, заранее неизвестно, поэтому
       границу справа снимаем у всех: ряды и так разделены линией. */
    .c10-seg button:last-child { border-bottom: 0; }
}

.c10-range { display: inline-flex; align-items: center; gap: .55rem; font-size: .82rem; color: var(--c10-ink-soft); font-weight: 600; }
.c10-range input[type=range] { width: 150px; accent-color: var(--c10-brand); }

.c10-legend { display: flex; flex-wrap: wrap; gap: .5rem .95rem; font-size: .78rem; color: var(--c10-ink-soft); }
.c10-legend span { display: inline-flex; align-items: center; gap: .35rem; }
.c10-legend i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }

/* ============================================================
   6. ТРЕНАЖЁР ЗАДАЧ
   ============================================================ */

.c10-trainer {
    margin: 2.5rem 0 0;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-lg);
    background: var(--c10-paper);
    box-shadow: var(--c10-sh-md);
    overflow: hidden;
}

.c10-trainer__head {
    padding: 1.3rem 1.5rem;
    background: linear-gradient(135deg, #1d2735, #2a3648);
    color: #fff;
}

.c10-trainer__head h2 { margin: 0 0 .3rem; border: 0; padding: 0; color: #fff; font-size: 1.3rem; }
.c10-trainer__head p { margin: 0; color: rgba(255, 255, 255, .72); font-size: .9rem; }

.c10-trainer__bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .6rem .9rem;
    padding: .9rem 1.5rem;
    border-bottom: 1px solid var(--c10-line-soft);
    background: #fbfaf8;
}

.c10-trainer__stats { margin-left: auto; display: flex; gap: 1.1rem; font-size: .82rem; font-weight: 700; }
.c10-stat { display: flex; align-items: baseline; gap: .3rem; color: var(--c10-ink-soft); }
.c10-stat b { font-size: 1.05rem; color: var(--c10-ink); }
.c10-stat--ok b { color: var(--c10-ok); }
.c10-stat--bad b { color: var(--c10-warn); }

.c10-progress { height: 6px; background: var(--c10-line-soft); border-radius: 99px; overflow: hidden; flex: 1 1 140px; min-width: 120px; }
.c10-progress i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--c10-ok), #34d399); transition: width .35s var(--c10-ease); }

/* --- Карточка задачи --- */
.c10-task {
    border-bottom: 1px solid var(--c10-line-soft);
    transition: background .2s var(--c10-ease);
}

.c10-task:last-child { border-bottom: 0; }
.c10-task.is-correct { background: linear-gradient(90deg, rgba(16, 185, 129, .07), transparent 40%); }
.c10-task.is-wrong { background: linear-gradient(90deg, rgba(239, 68, 68, .07), transparent 40%); }

.c10-task__head {
    display: flex;
    align-items: flex-start;
    gap: .85rem;
    padding: 1.1rem 1.5rem;
    cursor: pointer;
    user-select: none;
}

.c10-task__num {
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: 9px;
    display: grid;
    place-items: center;
    font-size: .82rem;
    font-weight: 800;
    background: var(--c10-line-soft);
    color: var(--c10-ink-soft);
    transition: all .2s var(--c10-ease);
}

.c10-task.is-correct .c10-task__num { background: var(--c10-ok); color: #fff; }
.c10-task.is-wrong .c10-task__num { background: var(--c10-warn); color: #fff; }

.c10-task__q { flex: 1; min-width: 0; font-size: .96rem; line-height: 1.6; color: var(--c10-ink); }

.c10-task__tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .5rem; }

.c10-tag {
    padding: .16rem .5rem;
    border-radius: 6px;
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .03em;
    background: var(--c10-line-soft);
    color: var(--c10-ink-soft);
}

.c10-tag--1 { background: #d1fae5; color: #047857; }  /* базовый */
.c10-tag--2 { background: #fef3c7; color: #b45309; }  /* средний */
.c10-tag--3 { background: #fee2e2; color: #b91c1c; }  /* сложный */
.c10-tag--exam { background: #e0e7ff; color: #4338ca; }

.c10-task__body { padding: 0 1.5rem 1.3rem 4.35rem; }

@media (max-width: 640px) {
    .c10-task__head { padding: 1rem; gap: .6rem; }
    .c10-task__body { padding: 0 1rem 1.2rem; }
}

/* --- Варианты ответа --- */
.c10-opts { display: grid; gap: .5rem; margin: .2rem 0 1rem; }

.c10-opt {
    display: flex;
    align-items: flex-start;
    gap: .7rem;
    padding: .7rem .9rem;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-sm);
    background: #fff;
    cursor: pointer;
    font-size: .92rem;
    line-height: 1.5;
    transition: all .16s var(--c10-ease);
}

.c10-opt:hover { border-color: var(--c10-brand); background: #fffdf8; }
.c10-opt input { margin-top: .2rem; accent-color: var(--c10-brand); flex-shrink: 0; }
.c10-opt.is-picked { border-color: var(--c10-brand); background: var(--c10-brand-tint); }
.c10-opt.is-right { border-color: var(--c10-ok); background: #ecfdf5; }
.c10-opt.is-wrong { border-color: var(--c10-warn); background: #fef2f2; }
.c10-opt.is-locked { cursor: default; }

/* --- Поле короткого ответа --- */
.c10-input {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    align-items: center;
    margin: .3rem 0 1rem;
}

.c10-input input {
    flex: 1 1 220px;
    min-width: 0;
    padding: .62rem .85rem;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-sm);
    font: inherit;
    font-size: .95rem;
    background: #fff;
    transition: border-color .16s var(--c10-ease), box-shadow .16s var(--c10-ease);
}

.c10-input input:focus {
    outline: 0;
    border-color: var(--c10-brand);
    box-shadow: 0 0 0 3px rgba(245, 166, 35, .16);
}

.c10-input input.is-right { border-color: var(--c10-ok); background: #ecfdf5; }
.c10-input input.is-wrong { border-color: var(--c10-warn); background: #fef2f2; }

.c10-hint-note { font-size: .8rem; color: var(--c10-ink-soft); margin: -.6rem 0 1rem; }

/* --- Разбор --- */
.c10-solution {
    margin-top: .9rem;
    padding: 1rem 1.15rem;
    border-radius: var(--c10-r-md);
    background: #f8fafc;
    border: 1px solid var(--c10-line-soft);
    border-left: 4px solid var(--c10-lab);
    font-size: .92rem;
    line-height: 1.68;
    animation: c10-fade .28s var(--c10-ease);
}

.c10-solution__label {
    font-size: .7rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--c10-lab);
    margin-bottom: .45rem;
}

.c10-solution p { margin: 0 0 .6rem; }
.c10-solution p:last-child { margin-bottom: 0; }

@keyframes c10-fade { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

.c10-answer-line { font-weight: 700; color: var(--c10-ok); }

/* Пусто по фильтру */
.c10-empty { padding: 2.5rem 1.5rem; text-align: center; color: var(--c10-ink-soft); font-size: .92rem; }

/* ============================================================
   7. ХАБ КУРСА
   ============================================================ */

.c10-hub { max-width: 1240px; margin: 0 auto; padding: 2rem 1.5rem 5rem; }

.c10-hub__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.1rem;
    margin-top: 1.5rem;
}

.c10-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 1.3rem 1.35rem 1.2rem;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-lg);
    background: var(--c10-paper);
    box-shadow: var(--c10-sh-sm);
    text-decoration: none !important;
    color: inherit;
    overflow: hidden;
    transition: transform .22s var(--c10-ease), box-shadow .22s var(--c10-ease), border-color .22s var(--c10-ease);
}

.c10-card::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 4px;
    background: var(--card-accent, var(--c10-brand));
    opacity: .85;
}

.c10-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--c10-sh-lg);
    border-color: var(--card-accent, var(--c10-brand));
}

.c10-card__top { display: flex; align-items: center; gap: .6rem; margin-bottom: .6rem; }

.c10-card__idx {
    width: 30px; height: 30px;
    border-radius: 9px;
    display: grid; place-items: center;
    font-size: .8rem; font-weight: 800;
    background: var(--card-accent, var(--c10-brand));
    color: #fff;
    flex-shrink: 0;
}

.c10-card__block { font-size: .68rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--c10-ink-soft); }

.c10-card h3 { margin: 0 0 .45rem; font-size: 1.04rem; font-weight: 700; line-height: 1.35; color: var(--c10-ink); }
.c10-card p { margin: 0 0 1rem; font-size: .855rem; line-height: 1.55; color: var(--c10-ink-soft); }

.c10-card__foot {
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .6rem;
    font-size: .76rem;
    font-weight: 700;
    color: var(--c10-ink-soft);
}

.c10-card__ring { display: flex; align-items: center; gap: .4rem; }
.c10-card__ring svg { width: 26px; height: 26px; transform: rotate(-90deg); }
.c10-card__ring circle { fill: none; stroke-width: 3.5; }
.c10-card__ring .bg { stroke: var(--c10-line-soft); }
.c10-card__ring .fg { stroke: var(--c10-ok); stroke-linecap: round; transition: stroke-dashoffset .5s var(--c10-ease); }

/* Тема ещё не написана: карточка видна в программе, но не кликается */
.c10-card.is-soon {
    opacity: .55;
    cursor: default;
    box-shadow: none;
    border-style: dashed;
}

.c10-card.is-soon:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--c10-line);
}

.c10-card.is-soon::before { opacity: .3; }

.c10-soon {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .2rem .55rem;
    border-radius: 6px;
    background: var(--c10-line-soft);
    color: var(--c10-ink-soft);
    font-size: .72rem;
    font-weight: 700;
}

.c10-block-title {
    display: flex;
    align-items: center;
    gap: .8rem;
    margin: 2.8rem 0 .2rem;
    font-size: .78rem;
    font-weight: 800;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--c10-ink-soft);
}

.c10-block-title::after { content: ''; flex: 1; height: 1px; background: var(--c10-line); }

/* Сводка курса */
.c10-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.6rem;
}

.c10-summary__cell {
    padding: 1.1rem 1.2rem;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-md);
    background: var(--c10-paper);
    box-shadow: var(--c10-sh-sm);
}

.c10-summary__cell b { display: block; font-size: 1.7rem; font-weight: 800; color: var(--c10-ink); line-height: 1.1; }
.c10-summary__cell span { font-size: .78rem; font-weight: 600; color: var(--c10-ink-soft); }

/* ============================================================
   8. НАВИГАЦИЯ МЕЖДУ ТЕМАМИ
   ============================================================ */

.c10-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 3rem;
}

@media (max-width: 640px) { .c10-pager { grid-template-columns: 1fr; } }

.c10-pager a {
    display: flex;
    flex-direction: column;
    gap: .3rem;
    padding: 1rem 1.2rem;
    border: 1px solid var(--c10-line);
    border-radius: var(--c10-r-md);
    background: var(--c10-paper);
    text-decoration: none !important;
    color: inherit;
    transition: all .2s var(--c10-ease);
}

.c10-pager a:hover { border-color: var(--c10-brand); box-shadow: var(--c10-sh-md); transform: translateY(-2px); }
.c10-pager small { font-size: .72rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--c10-ink-soft); }
.c10-pager b { font-size: .95rem; font-weight: 700; color: var(--c10-ink); }
.c10-pager .is-next { text-align: right; }

/* ============================================================
   9. МЕЛОЧИ
   ============================================================ */

.c10-crumbs { font-size: .82rem; color: var(--c10-ink-soft); margin-bottom: 1.2rem; }
.c10-crumbs a { color: var(--c10-ink-soft); text-decoration: none; }
.c10-crumbs a:hover { color: var(--c10-brand-dark); }
.c10-crumbs span { margin: 0 .4rem; opacity: .5; }

.c10-table-wrap { overflow-x: auto; margin: 1.6rem 0; border: 1px solid var(--c10-line); border-radius: var(--c10-r-md); }
.c10-table { width: 100%; border-collapse: collapse; font-size: .88rem; min-width: 480px; }
.c10-table th, .c10-table td { padding: .7rem .9rem; text-align: left; border-bottom: 1px solid var(--c10-line-soft); }
.c10-table th { background: #faf8f4; font-weight: 700; color: var(--c10-ink); font-size: .8rem; letter-spacing: .02em; }
.c10-table tr:last-child td { border-bottom: 0; }
.c10-table tbody tr:hover { background: #fdfcfa; }

@media print {
    .c10-toc, .c10-viz__controls, .c10-trainer__bar, .c10-readbar, .site-header { display: none !important; }
    .c10-hero { background: #fff !important; color: #000 !important; box-shadow: none; }
    .c10-hero h1, .c10-hero__lead { color: #000 !important; }
}

/* Список тем курса до срабатывания скрипта: он лежит в разметке
   страницы программы, а hub() в shell.js заменяет его карточками. */
.c10-hub-fallback { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.c10-hub-fallback li {
    background: #fff;
    border: 1px solid var(--c10-line, #E8E4DE);
    border-radius: 12px;
    padding: 16px 18px;
}
.c10-hub-fallback a { color: inherit; font-weight: 700; text-decoration: none; }
.c10-hub-fallback a:hover { color: var(--c10-brand-dark, #B45309); }
.c10-hub-fallback span {
    display: block;
    margin-top: 6px;
    font-size: .85rem;
    color: var(--c10-ink-soft, #6B7280);
}