/**
 * Единая шапка сайта: одни и те же размеры, отступы и брейкпоинты
 * на index.html и страницах solutions/.
 * Использует CSS-переменные :root с каждой страницы (b24-палитра).
 */

.b24-page {
    padding-top: 64px;
}

.b24-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(3, 3, 3, 0.92);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(12px);
}

/* Шире, чем узкий .container на странице «Задачи» (800px) */
.b24-header .container.b24-header-inner {
    max-width: 1180px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 4px;
    padding-right: 4px;
    padding-top: 0;
    padding-bottom: 0;
}

.b24-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    min-height: 64px;
    padding: 0 4px;
    box-sizing: border-box;
}

.b24-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.35rem;
    color: #fff;
    text-decoration: none;
    letter-spacing: -0.02em;
}

.b24-logo-mark {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: linear-gradient(145deg, #f8fafc 0%, var(--b24-accent-muted) 55%, #71717a 100%);
    box-shadow: 0 2px 14px rgba(var(--b24-accent-rgb), 0.18);
}

.b24-topnav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px 22px;
    flex: 1;
}

/* Только прямые ссылки навигации — не ссылки внутри выпадающего «Направления» */
.b24-topnav > a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
}

.b24-topnav > a:hover {
    color: #fff;
    border-bottom-color: var(--b24-accent);
}

.b24-topnav > a[aria-current="page"] {
    color: #fff;
    border-bottom-color: var(--b24-accent);
}

/* Направления (отделы): раскрывающийся список в шапке */
.b24-nav-details {
    position: relative;
    flex-shrink: 0;
}

.b24-nav-details > summary {
    list-style: none;
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    user-select: none;
}

.b24-nav-details > summary::-webkit-details-marker {
    display: none;
}

.b24-nav-details > summary::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 6px;
    vertical-align: middle;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    opacity: 0.75;
}

.b24-nav-details[open] > summary::after {
    transform: rotate(180deg);
}

.b24-nav-details > summary:hover,
.b24-nav-details[open] > summary {
    color: #fff;
    border-bottom-color: var(--b24-accent);
}

.b24-nav-details.b24-nav-details--active > summary {
    color: #fff;
    border-bottom-color: var(--b24-accent);
}

.b24-nav-details-panel {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: min(340px, calc(100vw - 40px));
    max-width: min(380px, calc(100vw - 24px));
    max-height: min(72vh, 480px);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 14px 18px 16px;
    border-radius: 14px;
    background: #141414;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    z-index: 1100;
}

.b24-nav-details-link {
    display: block;
    padding: 11px 14px;
    margin: 0 -4px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: #e2e8f0;
    text-decoration: none;
    border-bottom: none;
    white-space: nowrap;
}

.b24-nav-details-link:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
}

.b24-nav-details-link[aria-current="page"] {
    background: rgba(var(--b24-accent-rgb), 0.12);
    color: #fff;
}

/* Мега-меню (как у крупных B2B-лендингов): широкая светлая панель, сетка, карточки */
.b24-nav-details-panel--mega {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: min(960px, calc(100vw - 24px));
    min-width: unset;
    max-width: unset;
    max-height: min(85vh, 720px);
    overflow-x: hidden;
    overflow-y: auto;
    padding: 22px 26px 26px;
    border-radius: 18px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 24px 64px rgba(15, 23, 42, 0.14), 0 0 0 1px rgba(15, 23, 42, 0.04);
}

.b24-mega-grid {
    display: grid;
    gap: 12px 18px;
}

.b24-mega-grid--cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.b24-mega-grid--cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.b24-mega-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 18px;
    border-radius: 14px;
    text-decoration: none;
    color: inherit;
    border: 1px solid transparent;
    transition: background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.b24-mega-card:hover {
    background: #f1f5f9;
    border-color: #e2e8f0;
}

.b24-mega-card-icon {
    flex-shrink: 0;
    font-size: 1.65rem;
    line-height: 1;
    margin-top: 2px;
}

.b24-mega-card-body {
    display: block;
    min-width: 0;
}

.b24-mega-card-title {
    display: block;
    font-size: 0.9375rem;
    font-weight: 700;
    color: #0f172a;
    letter-spacing: -0.01em;
    margin-bottom: 6px;
    line-height: 1.25;
}

.b24-mega-card-desc {
    display: block;
    font-size: 0.8125rem;
    font-weight: 400;
    line-height: 1.45;
    color: #64748b;
    white-space: normal;
}

.b24-mega-card[aria-current="page"] {
    background: rgba(37, 99, 235, 0.06);
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.08);
}

.b24-mega-card[aria-current="page"] .b24-mega-card-title {
    color: #1d4ed8;
}

.b24-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.b24-theme-switch {
    display: inline-flex;
    padding: 3px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.14);
    gap: 2px;
    flex-shrink: 0;
}

.b24-theme-switch-btn {
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.55);
    padding: 6px 11px;
    border-radius: 999px;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    font-family: inherit;
    white-space: nowrap;
}

.b24-theme-switch-btn:hover {
    color: rgba(255, 255, 255, 0.9);
}

.b24-theme-switch-btn.is-active {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.b24-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 22px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.875rem;
    text-decoration: none;
    border: 2px solid transparent;
    transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
    white-space: nowrap;
}

.b24-btn--primary {
    background: linear-gradient(145deg, var(--b24-accent-hover) 0%, var(--b24-accent) 45%, var(--b24-accent-muted) 100%);
    color: var(--b24-ink);
    border-color: transparent;
    box-shadow: 0 2px 0 rgba(255, 255, 255, 0.15) inset, 0 6px 20px rgba(var(--b24-accent-rgb), 0.12);
}

.b24-btn--primary:hover {
    background: linear-gradient(145deg, #fff 0%, var(--b24-accent-hover) 50%, var(--b24-accent) 100%);
    border-color: transparent;
    transform: translateY(-1px);
}

.b24-btn--outline {
    background: transparent;
    color: rgba(255, 255, 255, 0.85);
    border-color: rgba(255, 255, 255, 0.22);
}

.b24-btn--outline:hover {
    border-color: rgba(var(--b24-accent-rgb), 0.45);
    color: #fff;
}

/* Светлая тема — только элементы шапки */
html[data-color-scheme="light"] .b24-header {
    background: rgba(255, 255, 255, 0.94);
    border-bottom-color: rgba(15, 23, 42, 0.08);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
}

html[data-color-scheme="light"] .b24-theme-switch {
    background: rgba(15, 23, 42, 0.06);
    border-color: rgba(15, 23, 42, 0.1);
}

html[data-color-scheme="light"] .b24-theme-switch-btn {
    color: #64748b;
}

html[data-color-scheme="light"] .b24-theme-switch-btn:hover {
    color: #0f172a;
}

html[data-color-scheme="light"] .b24-theme-switch-btn.is-active {
    background: #fff;
    color: #0f172a;
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.1);
}

html[data-color-scheme="light"] .b24-logo {
    color: #0f172a;
}

html[data-color-scheme="light"] .b24-logo-mark {
    background: linear-gradient(145deg, #fff 0%, #e2e8f0 50%, #94a3b8 100%);
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.12);
}

html[data-color-scheme="light"] .b24-topnav > a {
    color: #64748b;
}

html[data-color-scheme="light"] .b24-topnav > a:hover {
    color: #0f172a;
}

html[data-color-scheme="light"] .b24-topnav > a[aria-current="page"] {
    color: #0f172a;
    border-bottom-color: var(--b24-accent);
}

html[data-color-scheme="light"] .b24-btn--primary {
    background: linear-gradient(145deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%);
    color: #ffffff;
    box-shadow: 0 2px 0 rgba(255, 255, 255, 0.25) inset, 0 6px 22px rgba(37, 99, 235, 0.35);
}

html[data-color-scheme="light"] .b24-btn--primary:hover {
    background: linear-gradient(145deg, #60a5fa 0%, #3b82f6 45%, #2563eb 100%);
    color: #fff;
}

html[data-color-scheme="light"] .b24-btn--outline {
    color: #1e40af;
    border-color: rgba(37, 99, 235, 0.35);
}

html[data-color-scheme="light"] .b24-btn--outline:hover {
    border-color: rgba(37, 99, 235, 0.55);
    color: #1e3a8a;
}

html[data-color-scheme="light"] .b24-nav-details > summary {
    color: #64748b;
}

html[data-color-scheme="light"] .b24-nav-details > summary:hover,
html[data-color-scheme="light"] .b24-nav-details[open] > summary,
html[data-color-scheme="light"] .b24-nav-details.b24-nav-details--active > summary {
    color: #0f172a;
    border-bottom-color: var(--b24-accent);
}

html[data-color-scheme="light"] .b24-nav-details-panel {
    background: #fff;
    border-color: #e2e8f0;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
}

html[data-color-scheme="light"] .b24-nav-details-link {
    color: #334155;
}

html[data-color-scheme="light"] .b24-nav-details-link:hover {
    background: #f1f5f9;
    color: #0f172a;
}

html[data-color-scheme="light"] .b24-nav-details-link[aria-current="page"] {
    background: rgba(37, 99, 235, 0.08);
    color: #1d4ed8;
}

html[data-color-scheme="light"] .b24-nav-details-panel--mega {
    background: #ffffff;
    border-color: #e2e8f0;
    box-shadow: 0 24px 56px rgba(15, 23, 42, 0.1);
}

@media (max-width: 720px) {
    .b24-mega-grid--cols-3,
    .b24-mega-grid--cols-2 {
        grid-template-columns: 1fr;
    }

    .b24-nav-details-panel--mega {
        left: 0;
        transform: none;
        width: calc(100vw - 20px);
        max-width: calc(100vw - 20px);
    }
}

@media (max-width: 900px) {
    .b24-header-inner {
        flex-wrap: wrap;
        row-gap: 10px;
    }

    .b24-topnav {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        gap: 14px;
        padding: 4px 0 2px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
    }
}