@charset "UTF-8";
/* ============================================================
   formulas.css — справочник формул ЕГЭ (общие стили разделов)
   Сайдбар и раскладка — как в учебнике стереометрии /geom/
   ============================================================ */

/* ===== ОСНОВНОЙ КОНТЕЙНЕР ===== */
.container {
    display: flex;
    gap: 30px;
    max-width: 1400px;
    margin: 80px auto 40px;
    padding: 20px;
}

/* ===== САЙДБАР ===== */
.sidebar {
    width: 340px;
    flex-shrink: 0;

    border-radius: 12px;
    padding: 0;
    height: fit-content;
    position: sticky;
    top: 90px;
    max-height: calc(100vh - 100px);
    overflow: hidden;
}
.sidebar-inner {
    height: 100%;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    scrollbar-gutter: stable;
    padding: 16px 16px 20px 16px;
    border-radius: 12px;
}
.sidebar-inner::-webkit-scrollbar {
    width: 4px;
}
.sidebar-inner::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 16px;
}
.sidebar-inner::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 16px;
    transition: background 0.2s ease;
}
.sidebar-inner::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}
.sidebar-inner {
    scrollbar-width: thin;
    scrollbar-color: var(--border-light) transparent;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.sidebar-title i {
    color: var(--text-secondary);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px 7px 14px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
    transition: all 0.2s ease;
    border-left: 2px solid transparent;
    margin-bottom: 2px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    width: 100%;
}
.sidebar-nav-item:hover {
    background: var(--bg-surface);
    border-left-color: var(--text-secondary);
    color: var(--text-primary);
}
.sidebar-nav-item.active {
    background: var(--bg-surface);
    border-left-color: var(--text-primary);
    color: var(--text-primary);
    font-weight: 500;
}
.sidebar-nav-item .nav-text {
    flex: 1;
}

/* ===== КОНТЕНТ ===== */
.content {
    flex: 1 1 auto;
    min-width: 0;
}

/* Мягкая навигация: плавное появление контента */
.content.swap-in {
    animation: formulas-nav-fade-in 0.18s ease;
}
@keyframes formulas-nav-fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
    .content.swap-in { animation: none; }
}

.page-header {
    margin-bottom: 30px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-light);
}
.page-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
}
.page-header p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ——— ПЛАНИМЕТРИЯ: ТАБЫ ТЕМ ——— */
.plan-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 22px 0;
}
.plan-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: 1px solid var(--border-light);
    border-radius: 10px;
    background: var(--bg-base);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    line-height: 1.2;
    cursor: pointer;
    transition: all 0.2s ease;
}
.plan-tab:hover {
    border-color: var(--border-focus);
    color: var(--text-primary);
    transform: translateY(-1px);
}
.plan-tab.active {
    background: var(--btn-primary-bg);
    border-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
}
.plan-tab-reset {
    border-style: dashed;
}
.plan-tab-reset.active {
    border-style: solid;
}

.plan-filterbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0 0 16px 0;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    color: var(--text-secondary);
}
.plan-filterbar[hidden] {
    display: none;
}
.plan-filterbar-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.plan-chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 4px 11px;
    border: 1px solid var(--border-focus);
    border-radius: 20px;
    background: var(--bg-surface);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}
.plan-chip::after {
    content: '\00d7';
    font-size: 13px;
    line-height: 1;
    color: var(--text-tertiary);
}
.plan-chip:hover {
    border-color: var(--text-tertiary);
}
.plan-filterbar-count {
    color: var(--text-tertiary);
    white-space: nowrap;
}

.plan-empty {
    margin: 8px 0 20px 0;
    padding: 18px 20px;
    border: 1px dashed var(--border-light);
    border-radius: 10px;
    background: var(--bg-base);
    color: var(--text-secondary);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    text-align: center;
}
.plan-empty[hidden] {
    display: none;
}
.plan-tab-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.plan-tab-icon svg {
    display: block;
    width: 20px;
    height: 20px;
}

@media (max-width: 900px) {
    .plan-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 6px;
        scrollbar-width: thin;
    }
    .plan-tab {
        flex: 0 0 auto;
        white-space: nowrap;
    }
}

/* ——— КАРТОЧКИ ТЕМ НА ОБЗОРНОЙ СТРАНИЦЕ ——— */
.topic-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}
.topic-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 18px 20px;
    text-decoration: none;
    color: var(--text-primary);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    transition: all 0.2s ease;
}
.topic-card:hover {
    border-color: var(--border-focus);
    transform: translateY(-2px);
}
.topic-card .topic-card-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}
.topic-card .topic-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}
.plan-tab-label {
    display: none;
}
.plan-tab-label.plan-tab-label-all {
    display: block;
}
/* ——— ОСНОВНОЙ КОНТЕЙНЕР РАЗДЕЛА ——— */
.formula-section {
    margin-bottom: 24px;
    padding: 0;
    display: block;
    background: transparent;
    border: none;
    box-shadow: none;
}

.formula-section h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: transparent;
    padding: 0;
}
.formula-section h2 .section-number {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-tertiary);
    background: var(--bg-surface);
    padding: 2px 12px;
    border-radius: 20px;
}

.formula-section h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-secondary);
    margin: 20px 0 12px 0;
}
.formula-section h3:first-of-type {
    margin-top: 0;
}

/* ——— БЕЛЫЕ БЛОКИ-ПЛАШКИ ДЛЯ ГРУПП ФОРМУЛ ——— */
.formula-subblock {
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 20px 30px;
    margin-bottom: 14px;
    display: inline-block;
    width: auto;
    min-width: 180px;
    vertical-align: top;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.formula-subblock:last-child {
    margin-bottom: 0;
}

/* ——— КОНТЕЙНЕР ДЛЯ ПЛАШЕК (галерея) ——— */
.subblock-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: flex-start;
}
.subblock-gallery .formula-subblock {
    margin-bottom: 0;
    flex: 0 1 auto;
}

.formula-subblock h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--bg-surface);
    white-space: nowrap;
}

/* ——— СТИЛЬ ДЛЯ БЛОКОВ С НАЗВАНИЯМИ (столбик: название, чертёж, формула) ——— */
.formula-subblock .formula-grid-named {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    align-items: stretch;
}
.formula-subblock .formula-grid-named .formula-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: left;
    padding: 2px 0;
}
.formula-subblock .formula-grid-named .formula-math {
    font-size: 15px;
    color: var(--text-primary);
    text-align: left;
    display: block;
    padding: 2px 0;
}
.formula-subblock .formula-grid-named .formula-desc {
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: left;
    padding: 0 0 2px 0;
}
.formula-subblock .formula-grid-named .geometry-drawing {
    margin: 2px 0;
    text-align: left;
}
.formula-subblock .formula-grid-named .geometry-drawing svg {
    max-width: 100%;
    height: auto;
    background: var(--bg-base);
    border-radius: 4px;
}

/* ——— СТИЛЬ ДЛЯ БЛОКОВ БЕЗ НАЗВАНИЙ (Уравнения, Вычисления) ——— */
.formula-subblock .formula-grid-plain {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 100%;
}
.formula-subblock .formula-grid-plain .formula-item {
    padding: 2px 0;
    text-align: left;
}
.formula-subblock .formula-grid-plain .formula-math {
    font-size: 15px;
    color: var(--text-primary);
    text-align: left;
    display: block;
}
.formula-subblock .formula-grid-plain .formula-desc {
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: left;
}

/* ——— СТИЛЬ ДЛЯ БЛОКОВ С НУМЕРАЦИЕЙ (Вычисления) ——— */
.formula-subblock .formula-grid-numbered {
    display: flex;
    flex-direction: column;
    gap: 2px;
    width: 100%;
}
.formula-subblock .formula-grid-numbered .formula-item {
    display: flex;
    gap: 8px 16px;
    align-items: baseline;
    padding: 2px 0;
    text-align: left;
}
.formula-subblock .formula-grid-numbered .formula-num {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    min-width: 24px;
    flex-shrink: 0;
    text-align: left;
}
.formula-subblock .formula-grid-numbered .formula-math {
    font-size: 15px;
    color: var(--text-primary);
    text-align: left;
    display: block;
}

/* ——— РИСУНКИ ВНУТРИ БЛОКОВ ——— */
.formula-subblock .geometry-drawing {
    margin: 6px 0 2px 0;
    text-align: left;
}
.formula-subblock .geometry-drawing svg {
    max-width: 100%;
    height: auto;
    background: var(--bg-base);
    border-radius: 4px;

}

/* ——— ФОРМАТИРОВАНИЕ MATHJAX ——— */
mjx-container[jax="CHTML"][display="true"] {
    display: block;
    text-align: left !important;
    margin: 10px 30px !important;
}

.geometry-drawing {
    margin: 10px 0 4px 0;
    text-align: center;
}
.geometry-drawing svg {
    max-width: 100%;
    height: auto;
    background: var(--bg-base);
    border-radius: 4px;

}

.deriv-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 40px;
    margin-top: 6px;
}
.deriv-table .deriv-header {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0 0 8px 0;
    border-bottom: 2px solid var(--border-light);
}
.deriv-table .deriv-row {
    display: contents;
}
.deriv-table .deriv-cell {
    padding: 6px 0;
    border-bottom: 1px solid var(--border-light);
}
.deriv-table .deriv-cell .formula-math {
    font-size: 17px;
    color: var(--text-primary);
}

/* ===== АДАПТИВ ===== */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
    .container {
        gap: 20px;
        padding: 16px;
    }
}

@media (max-width: 900px) {
    .container {
        flex-direction: column;
        gap: 16px;
        padding: 12px;
        margin-top: 72px;
    }
    .sidebar {
        width: 100%;
        position: static;
        max-height: none;
        border-radius: 12px;
    }
    .sidebar-inner {
        max-height: none;
        padding: 12px 14px;
    }
    .sidebar-title {
        font-size: 16px;
        padding-bottom: 12px;
        margin-bottom: 10px;
    }
    .sidebar-nav-item {
        padding: 5px 10px;
        font-size: 13px;
    }
    .topic-cards {
        grid-template-columns: 1fr;
    }
    .subblock-gallery {
        flex-direction: column;
        align-items: stretch;
    }
    .subblock-gallery .formula-subblock {
        flex: 1 1 auto;
        width: 100%;
        padding: 16px 20px;
    }
    .formula-subblock .formula-grid-named {
        gap: 6px;
    }
    .deriv-table {
        grid-template-columns: 1fr;
        gap: 0;
    }
    .deriv-table .deriv-header {
        padding: 6px 0 4px 0;
        font-size: 12px;
    }
    .deriv-table .deriv-cell {
        padding: 4px 0;
    }
    .formula-section {
        padding: 0;
    }
    .page-header h1 {
        font-size: 24px;
    }
    .formula-subblock .formula-grid-numbered .formula-item {
        flex-wrap: wrap;
    }
    mjx-container[jax="CHTML"][display="true"] {
        margin: 10px 10px !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 8px;
        margin-top: 64px;
    }
    .page-header h1 {
        font-size: 19px;
    }
    .sidebar-nav-item {
        padding: 4px 8px;
        font-size: 12px;
    }
}

/* ============================================================
   МОБИЛЬНАЯ НАВИГАЦИЯ /ege/formulas: полоска раздела, пейджер
   «назад/далее» и меню-шторка (разметку создаёт js/formulas-mobile-nav.js)
   ============================================================ */

.formulas-mobile-chapter {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    height: 42px;
    display: none;
    align-items: center;
    gap: 8px;
    padding: 0 14px;
    margin: 0;
    border: none;
    background: var(--bg-base);
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    cursor: pointer;
    z-index: 995;
    text-align: left;
    font-family: 'Inter', sans-serif;
}
.formulas-mobile-chapter > i {
    color: var(--text-secondary);
    font-size: 13px;
    flex-shrink: 0;
}
.formulas-mobile-chapter:active {
    background: var(--bg-surface);
}
.formulas-chapter-title {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 6px;
}
.formulas-chapter-label {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-tertiary);
    flex-shrink: 0;
}
.formulas-chapter-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}
.formulas-chapter-hint {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-surface);
    border-radius: 6px;
    padding: 4px 8px;
    flex-shrink: 0;
}
.formulas-chapter-hint i {
    font-size: 11px;
}

.formulas-mobile-pager {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
    background: var(--bg-base);
    border-top: 1px solid var(--border-light);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
    z-index: 996;
}
.formulas-mobile-pager a {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    flex: 1 1 50%;
    height: 46px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    transition: background 0.2s ease;
}
.formulas-mobile-pager a + a {
    border-left: 1px solid var(--border-light);
}
.formulas-mobile-pager a:active {
    background: var(--bg-surface);
}
.formulas-mobile-pager a.disabled {
    color: var(--text-tertiary);
    opacity: 0.55;
    pointer-events: none;
}
.formulas-mobile-pager a i {
    font-size: 12px;
}

.formulas-drawer-close {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 5;
    width: 30px;
    height: 30px;
    display: none;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
}
.formulas-drawer-close:active {
    background: var(--bg-surface);
}

.formulas-drawer-overlay {
    position: fixed;
    inset: 0;
    display: none;
    background: rgba(20, 24, 40, 0.38);
    z-index: 1150;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

@media (max-width: 820px) {
    .formulas-mobile-chapter {
        display: flex;
    }
    .formulas-mobile-pager {
        display: flex;
    }
    .formulas-drawer-close {
        display: flex;
    }
    .formulas-drawer-overlay {
        display: block;
    }
    .formulas-drawer-overlay.show {
        opacity: 1;
        visibility: visible;
    }

    body.formulas-mobile-drawer {
        padding-bottom: 56px;
    }
    body.formulas-mobile-drawer .container {
        margin-top: 108px;
    }

    body.formulas-mobile-drawer .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        height: 100vh;
        max-height: none;
        width: min(340px, 88vw);
        border-radius: 0;
        background: var(--bg-base);
        border-right: 1px solid var(--border-light);
        box-shadow: 0 8px 28px rgba(0, 0, 0, 0.22);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        overflow: hidden;
        z-index: 1200;
    }
    body.formulas-mobile-drawer.formulas-drawer-open .sidebar {
        transform: translateX(0);
    }
    body.formulas-mobile-drawer.formulas-drawer-open {
        overflow: hidden;
    }
    html.formulas-mobile-drawer.formulas-drawer-open {
        overflow: hidden;
    }
}

@media (max-width: 480px) {
    body.formulas-mobile-drawer .sidebar {
        width: 86vw;
    }
    .formulas-chapter-label {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    body.formulas-mobile-drawer .sidebar,
    .formulas-drawer-overlay {
        transition: none;
    }
}