/* SpeedAd Help Center Custom Styles */

/* ============================================
   1. Legacy hero (faq.html が継続利用)
   ============================================ */
.help-center-hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
    background:
        radial-gradient(1200px 400px at 20% -10%, rgba(255, 255, 255, 0.25), transparent 60%),
        linear-gradient(135deg, var(--color-brand-base-primary, #4285F4) 0%, #2b58c9 55%, #1f3a8a 100%);
    color: white;
    overflow: hidden;
}

.help-center-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 32px 32px;
    -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.6) 0%, transparent 75%);
    mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.6) 0%, transparent 75%);
    pointer-events: none;
}

.help-center-hero > .relative {
    position: relative;
    z-index: 1;
}

/* ============================================
   1.5 Breadcrumb (ヒーロー上部) — help-center / faq 共通
   ============================================ */
.hc-breadcrumb-top {
    width: calc(100% - 2rem);
    max-width: 72rem;
    margin: 0.75rem auto 0;
    padding: 0 0.5rem;
    font-size: 0.8125rem;
    color: var(--color-text-sub, #6b6b6b);
}

@media (min-width: 768px) {
    .hc-breadcrumb-top {
        margin: 1rem auto 0;
        padding: 0 0.75rem;
    }
}

.hc-breadcrumb-top nav[aria-label="Breadcrumb"] ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0;
}

.hc-breadcrumb-top a {
    color: var(--color-brand-base-primary, #4285F4);
    text-decoration: none;
}

.hc-breadcrumb-top a:hover {
    text-decoration: underline;
}

.hc-breadcrumb-top .material-icons {
    font-size: 1rem !important;
    color: var(--color-text-sub, #6b6b6b);
}

.hc-breadcrumb-top .text-on-surface-variant {
    color: var(--color-text-main, #1a1a1a);
    font-weight: 500;
}

/* ============================================
   2. New Hero (help.html) — カード型ヒーロー
   ============================================ */
.hc-hero {
    position: relative;
    width: calc(100% - 2rem);
    max-width: 72rem;
    margin: 0.75rem auto 2rem;
    padding: 3rem 1.25rem 3.5rem;
    text-align: center;
    color: #ffffff;
    overflow: hidden;
    isolation: isolate;
    border-radius: 1.5rem;
    background: linear-gradient(135deg, #1f3a8a 0%, var(--color-brand-base-primary, #4285F4) 55%, #6ba4ff 100%);
    box-shadow: 0 20px 50px -24px rgba(31, 58, 138, 0.45), 0 8px 20px -12px rgba(0, 0, 0, 0.08);
}

@media (min-width: 768px) {
    .hc-hero {
        padding: 4rem 2.5rem 4.5rem;
        margin: 1rem auto 2.5rem;
        border-radius: 1.75rem;
    }
}

.hc-hero__bg {
    position: absolute;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.hc-hero__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 48px 48px;
    -webkit-mask-image: radial-gradient(ellipse at 50% 30%, rgba(0, 0, 0, 0.55) 0%, transparent 70%);
    mask-image: radial-gradient(ellipse at 50% 30%, rgba(0, 0, 0, 0.55) 0%, transparent 70%);
}

.hc-hero__glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.45;
}

.hc-hero__glow--1 {
    width: 420px;
    height: 420px;
    background: rgba(139, 180, 255, 0.5);
    top: -80px;
    left: -120px;
}

.hc-hero__glow--2 {
    width: 520px;
    height: 520px;
    background: rgba(64, 120, 220, 0.45);
    bottom: -200px;
    right: -140px;
    opacity: 0;
}

.hc-hero__inner {
    position: relative;
    max-width: 48rem;
    margin: 0 auto;
}

.hc-hero__title {
    font-size: clamp(1.875rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    color: #ffffff;
    margin: 0 0 0.75rem;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    letter-spacing: -0.01em;
}

.hc-hero__subtitle {
    font-size: 1.0625rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* ============================================
   3. Search (new)
   ============================================ */
.hc-search {
    position: relative;
    max-width: 42rem;
    margin: 0 auto;
}

.hc-search__icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-brand-base-primary, #4285F4);
    font-size: 1.5rem !important;
    pointer-events: none;
    z-index: 1;
}

input.hc-search__input[type="search"] {
    width: 100%;
    height: 4rem;
    padding: 0 1.5rem 0 3.5rem;
    font-size: 1.0625rem;
    background: #ffffff;
    border: 2px solid transparent;
    border-radius: 9999px;
    color: var(--color-text-main, #1a1a1a);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18), 0 2px 6px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

input.hc-search__input[type="search"]::placeholder {
    color: #9a9a9a;
}

input.hc-search__input[type="search"]:focus {
    outline: none;
    border-color: var(--color-brand-base-primary, #4285F4);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2), 0 0 0 3px rgba(66, 133, 244, 0.3);
}

/* ============================================
   4. Suggestions dropdown (reused)
   ============================================ */
.hc-suggestions {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 0.5rem);
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 1rem;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.18);
    max-height: 22rem;
    overflow-y: auto;
    text-align: left;
    z-index: 20;
}

.hc-suggestions[hidden] { display: none; }

.hc-suggestion {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    padding: 0.875rem 1.125rem;
    border-bottom: 1px solid var(--color-base-border-divider, #e0e0e0);
    color: var(--color-text-main, #1a1a1a);
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.hc-suggestion:last-child { border-bottom: none; }

.hc-suggestion:hover,
.hc-suggestion.is-active {
    background: rgba(66, 133, 244, 0.08);
    outline: none;
}

.hc-suggestion.is-active {
    box-shadow: inset 3px 0 0 var(--color-brand-base-primary, #4285F4);
}

.hc-suggestion__category {
    font-size: 0.6875rem;
    font-weight: 700;
    color: #1f3a8a;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.hc-suggestion__question {
    font-size: 0.9375rem;
    color: var(--color-text-main, #1a1a1a);
    line-height: 1.45;
}

.hc-suggestion__question mark {
    background: transparent;
    color: var(--color-brand-base-primary, #4285F4);
    font-weight: 700;
    padding: 0;
}

.hc-suggestion-empty {
    padding: 1.25rem;
    text-align: center;
    color: var(--color-text-sub, #6b6b6b);
    font-size: 0.875rem;
}

/* ============================================
   5. Keyword chips (hero)
   ============================================ */
.hc-keywords {
    margin-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.hc-keywords__label {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.85);
    margin-right: 0.25rem;
}

.hc-keywords__chip {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.875rem;
    background: rgba(255, 255, 255, 0.92);
    color: var(--color-brand-base-primary, #4285F4);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 9999px;
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.hc-keywords__chip:hover {
    transform: translateY(-1px);
    background: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.hc-keywords__chip:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

/* ============================================
   6. Sticky compact search
   ============================================ */
.hc-sticky-search {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    z-index: 40;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-base-border-divider, #e0e0e0);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    padding: 0.625rem 1rem;
    transform: translateY(-120%);
    transition: transform 0.2s ease;
}

.hc-sticky-search.is-visible {
    transform: translateY(0);
}

@media (min-width: 1024px) {
    .hc-sticky-search {
        left: 18rem;
    }
}

.hc-sticky-search__inner {
    max-width: 42rem;
    margin: 0 auto;
    position: relative;
}

.hc-sticky-search__icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-sub, #6b6b6b);
    font-size: 1.25rem !important;
    pointer-events: none;
}

input.hc-sticky-search__input[type="search"] {
    width: 100%;
    height: 2.75rem;
    padding: 0 1rem 0 3rem;
    font-size: 0.9375rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 9999px;
    color: var(--color-text-main, #1a1a1a);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input.hc-sticky-search__input[type="search"]:focus {
    outline: none;
    border-color: var(--color-brand-base-primary, #4285F4);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.2);
}

/* ============================================
   7. Main container
   ============================================ */
.hc-main {
    width: 100%;
    max-width: 72rem;
    margin: 0 auto;
    padding: 0 1rem 4rem;
}

@media (min-width: 640px) { .hc-main { padding-left: 1.5rem; padding-right: 1.5rem; } }
@media (min-width: 1024px) { .hc-main { padding-left: 2rem; padding-right: 2rem; } }

/* ============================================
   8. Breadcrumb
   ============================================ */
.hc-breadcrumb {
    padding: 1.5rem 0 1rem;
    font-size: 0.875rem;
}

.hc-breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.25rem;
}

.hc-breadcrumb li + li::before {
    content: '/';
    margin: 0 0.5rem;
    color: var(--color-text-sub, #6b6b6b);
}

.hc-breadcrumb a {
    color: var(--color-brand-base-primary, #4285F4);
    text-decoration: none;
}

.hc-breadcrumb a:hover { text-decoration: underline; }

.hc-breadcrumb li[aria-current="page"] {
    color: var(--color-text-main, #1a1a1a);
    font-weight: 600;
}

/* ============================================
   9. Section heading
   ============================================ */
.hc-section-heading {
    text-align: center;
    margin-bottom: 2rem;
}

.hc-section-heading__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-main, #1a1a1a);
    letter-spacing: -0.01em;
    margin-bottom: 0.375rem;
}

.hc-section-heading__subtitle {
    font-size: 0.9375rem;
    color: var(--color-text-sub, #6b6b6b);
}

.hc-categories,
.hc-popular {
    padding: 2.5rem 0;
}

.hc-categories + .hc-popular {
    border-top: 1px solid var(--color-base-border-divider, #e0e0e0);
}

/* ============================================
   10. Category bento grid
   ============================================ */
.hc-category-grid {
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 1rem;
}

@media (min-width: 640px) { .hc-category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .hc-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.hc-cat-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 1rem;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    overflow: hidden;
}

.hc-cat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 1rem;
    right: 1rem;
    height: 3px;
    background: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    opacity: 0.9;
    border-radius: 9999px;
}

.hc-cat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.08);
    border-color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
}

.hc-cat-card:focus-visible {
    outline: 2px solid var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    outline-offset: 3px;
}

.hc-cat-card__header {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    margin-bottom: 1rem;
}

.hc-cat-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.75rem;
    background: color-mix(in srgb, var(--hc-accent, #4285F4) 10%, transparent);
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    flex-shrink: 0;
}

.hc-cat-card__icon .material-icons {
    font-size: 1.5rem !important;
}

.hc-cat-card__title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-text-main, #1a1a1a);
    line-height: 1.35;
    margin: 0;
}

.hc-cat-card__desc {
    font-size: 0.8125rem;
    color: var(--color-text-sub, #4d4d4d);
    margin-top: 0.125rem;
}

.hc-cat-card__articles {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.hc-cat-card__article {
    display: flex;
    align-items: flex-start;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--color-text-sub, #6b6b6b);
    line-height: 1.45;
}

.hc-cat-card__article .material-icons {
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    font-size: 1rem !important;
    margin-top: 0.125rem;
    flex-shrink: 0;
}

.hc-cat-card__more {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    margin-top: auto;
}

.hc-cat-card__more .material-icons {
    font-size: 1rem !important;
    transition: transform 0.2s ease;
}

.hc-cat-card:hover .hc-cat-card__more .material-icons {
    transform: translateX(3px);
}

/* ============================================
   11. Popular articles grid
   ============================================ */
.hc-popular-grid {
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 0.75rem;
}

@media (min-width: 640px) { .hc-popular-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .hc-popular-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.hc-pop-card {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.125rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 0.75rem;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.hc-pop-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-brand-base-primary, #4285F4);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

.hc-pop-card:focus-visible {
    outline: 2px solid var(--color-brand-base-primary, #4285F4);
    outline-offset: 2px;
}

.hc-pop-card__body { flex: 1; min-width: 0; }

.hc-pop-card__category {
    font-size: 0.6875rem;
    font-weight: 700;
    color: #1f3a8a;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.25rem;
}

.hc-pop-card__title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-main, #1a1a1a);
    line-height: 1.45;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hc-pop-card__chevron {
    color: var(--color-text-sub, #6b6b6b);
    flex-shrink: 0;
    font-size: 1.25rem !important;
    margin-top: 0.125rem;
}

.hc-popular-empty {
    text-align: center;
    color: var(--color-text-sub, #6b6b6b);
    font-size: 0.875rem;
}

/* ============================================
   12. CTA
   ============================================ */
.hc-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.25rem;
    padding: 2.5rem 1.5rem;
    margin-top: 2rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

@media (min-width: 768px) {
    .hc-cta {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
        padding: 2rem 2.5rem;
    }
}

.hc-cta__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-main, #1a1a1a);
    margin: 0 0 0.375rem;
}

.hc-cta__subtitle {
    font-size: 0.9375rem;
    color: var(--color-text-sub, #6b6b6b);
    margin: 0;
}

.hc-cta__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.hc-cta__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.hc-cta__btn .material-icons { font-size: 1.125rem !important; }

.hc-cta__btn--primary {
    background: var(--color-brand-base-primary, #4285F4);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
}

.hc-cta__btn--primary:hover {
    background: var(--color-button-primary-hover-bg, #3367D6);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(66, 133, 244, 0.4);
}

.hc-cta__btn--ghost {
    background: #ffffff;
    color: var(--color-brand-base-primary, #4285F4);
    border: 1px solid var(--color-brand-base-primary, #4285F4);
}

.hc-cta__btn--ghost:hover {
    background: rgba(66, 133, 244, 0.08);
    transform: translateY(-1px);
}

/* ============================================
   13. 共通スタイル (help-content.html / faq.html でも使用)
   ============================================ */

/* 記事本文のスタイル (Tailwind prose風) */
.prose { line-height: 1.7; }
.prose h1, .prose h2, .prose h3 {
    font-weight: 700;
    margin-bottom: 1em;
}
.prose p { margin-bottom: 1em; }
.prose a {
    color: var(--color-primary);
    text-decoration: underline;
}
.prose ul, .prose ol {
    padding-left: 1.5em;
    margin-bottom: 1em;
}
.prose li { margin-bottom: 0.5em; }

/* 記事本文 markdown-lite スタイル */
.help-article-body h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-top: 1.75em;
    margin-bottom: 0.75em;
    color: var(--color-on-surface, #1d1b20);
    border-left: 4px solid var(--color-primary, #6750a4);
    padding-left: 0.75rem;
}

.help-article-body ol {
    list-style: decimal;
    padding-left: 1.5em;
    margin-bottom: 1em;
}

.help-article-body ol li {
    margin-bottom: 0.5em;
    padding-left: 0.25em;
}

.help-article-body blockquote {
    border-left: 4px solid var(--color-outline, #79747e);
    background-color: var(--color-surface-variant, #e7e2ec);
    padding: 0.875rem 1rem;
    margin: 1em 0;
    border-radius: 0 0.5rem 0.5rem 0;
    color: var(--color-on-surface-variant, #49454f);
    font-size: 0.9375rem;
}

.help-article-body code {
    background-color: var(--color-surface-variant, #e7e2ec);
    color: var(--color-on-surface, #1d1b20);
    padding: 0.1em 0.35em;
    border-radius: 0.25em;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.875em;
}

.help-article-body strong {
    color: var(--color-on-surface, #1d1b20);
    font-weight: 700;
}

.help-article-body a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* フィードバックボタン (help-content / faq) */
.feedback-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-outline);
    border-radius: 9999px;
    background-color: var(--color-surface);
    color: var(--color-on-surface-variant);
    cursor: pointer;
    transition: all 0.2s ease;
}

.feedback-btn:hover {
    background-color: var(--color-surface-variant);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* 関連記事 (help-content) */
.related-article-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border: 1px solid var(--color-outline);
    border-radius: 0.5rem;
    background-color: var(--color-surface);
    color: var(--color-on-surface);
    text-decoration: none;
    transition: all 0.2s ease;
}

.related-article-link:hover {
    background-color: var(--color-surface-variant);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* 検索結果ハイライト */
mark {
    background-color: var(--color-state-warning);
    color: var(--color-state-on-warning);
    padding: 0.1em 0.2em;
    border-radius: 0.2em;
}

/* 動画埋め込み */
.video-embed {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 0.75rem;
    overflow: hidden;
    background-color: var(--color-surface-variant, #e7e2ec);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* キーワードチップ (faq.html ヒーロー) */
.keyword-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.875rem;
    background-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 9999px;
    font-size: 0.875rem;
    text-decoration: none;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    cursor: pointer;
}

.keyword-chip:hover {
    background-color: rgba(255, 255, 255, 0.28);
    border-color: rgba(255, 255, 255, 0.55);
    transform: translateY(-1px);
}

.keyword-chip:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

/* ============================================
   15. Help content page (category / article / search)
   ============================================ */

/* コンテンツラッパー（hc-mainと揃える） */
.hc-content {
    width: 100%;
    max-width: 56rem;
    margin: 0 auto;
    padding: 0 1rem 4rem;
}
@media (min-width: 640px) { .hc-content { padding-left: 1.5rem; padding-right: 1.5rem; } }
@media (min-width: 1024px) { .hc-content { padding-left: 2rem; padding-right: 2rem; } }

/* カテゴリヘッダー（4px カラーバー + タイトル + 説明） */
.hc-content-header {
    position: relative;
    padding: 2rem 1.5rem 1.75rem;
    margin: 0.75rem 0 1.5rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}
.hc-content-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
}

.hc-content-header__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    margin-bottom: 0.5rem;
}
.hc-content-header__eyebrow .material-icons {
    font-size: 1rem !important;
}

.hc-content-header__title {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text-main, #1a1a1a);
    letter-spacing: -0.01em;
    margin: 0 0 0.375rem;
}

.hc-content-header__desc {
    font-size: 0.9375rem;
    color: var(--color-text-sub, #4d4d4d);
    line-height: 1.55;
    margin: 0;
    max-width: 42rem;
}

.hc-content-header__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.625rem;
    margin-top: 1.125rem;
}

/* 件数ピルバッジ */
.hc-count-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.3rem 0.75rem;
    background: color-mix(in srgb, var(--hc-accent, #4285F4) 10%, transparent);
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    border-radius: 9999px;
    font-size: 0.8125rem;
    font-weight: 700;
}
.hc-count-pill .material-icons {
    font-size: 0.9375rem !important;
}

/* ツールバー（カテゴリ内検索＋ソート） */
.hc-content-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.hc-content-toolbar__search {
    position: relative;
    flex: 1 1 16rem;
    min-width: 12rem;
}
.hc-content-toolbar__search .material-icons {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-sub, #6b6b6b);
    font-size: 1.125rem !important;
    pointer-events: none;
}
input.hc-content-toolbar__search-input[type="search"] {
    width: 100%;
    height: 2.5rem;
    padding: 0 0.875rem 0 2.25rem;
    font-size: 0.9375rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 9999px;
    color: var(--color-text-main, #1a1a1a);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
input.hc-content-toolbar__search-input[type="search"]:focus {
    outline: none;
    border-color: var(--color-brand-base-primary, #4285F4);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.25);
}

.hc-content-toolbar__sort {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.hc-content-toolbar__sort-label {
    font-size: 0.8125rem;
    color: var(--color-text-sub, #4d4d4d);
    font-weight: 500;
}
select.hc-content-toolbar__sort-select {
    height: 2.5rem;
    padding: 0 2rem 0 0.875rem;
    font-size: 0.875rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 9999px;
    color: var(--color-text-main, #1a1a1a);
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%234d4d4d' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
select.hc-content-toolbar__sort-select:focus {
    outline: none;
    border-color: var(--color-brand-base-primary, #4285F4);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.25);
}

/* 記事リスト */
.hc-content-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
}

.hc-content-item {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 0.875rem;
    padding: 1rem 1rem 1rem 1.25rem;
    background: #ffffff;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 0.75rem;
    color: inherit;
    text-decoration: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
    overflow: hidden;
}
.hc-content-item + .hc-content-item {
    margin-top: 0.625rem;
}
.hc-content-item::before {
    content: '';
    position: absolute;
    top: 0.5rem;
    bottom: 0.5rem;
    left: 0;
    width: 3px;
    background: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    border-radius: 0 2px 2px 0;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}
.hc-content-item:hover {
    border-color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}
.hc-content-item:hover::before { opacity: 1; }
.hc-content-item:focus-visible {
    outline: 2px solid var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    outline-offset: 2px;
}

.hc-content-item__body { flex: 1; min-width: 0; }

.hc-content-item__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.375rem;
    font-size: 0.75rem;
    color: var(--color-text-sub, #6b6b6b);
}

.hc-content-item__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}
.hc-content-item__badge--featured {
    background: color-mix(in srgb, var(--hc-accent, #4285F4) 12%, transparent);
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
}
.hc-content-item__badge--featured .material-icons {
    font-size: 0.8125rem !important;
}
.hc-content-item__badge--updated {
    color: var(--color-text-sub, #4d4d4d);
    font-weight: 500;
}

.hc-content-item__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-main, #1a1a1a);
    line-height: 1.45;
    margin: 0 0 0.25rem;
}

.hc-content-item__summary {
    font-size: 0.875rem;
    color: var(--color-text-sub, #4d4d4d);
    line-height: 1.55;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hc-content-item__chevron {
    color: var(--color-text-sub, #6b6b6b);
    flex-shrink: 0;
    font-size: 1.25rem !important;
    margin-top: 0.125rem;
    transition: transform 0.2s ease, color 0.2s ease;
}
.hc-content-item:hover .hc-content-item__chevron {
    color: var(--hc-accent, var(--color-brand-base-primary, #4285F4));
    transform: translateX(3px);
}

/* 検索結果行用（mark 含む） */
.hc-content-item mark {
    background: color-mix(in srgb, var(--hc-accent, #4285F4) 18%, transparent);
    color: inherit;
    font-weight: 700;
    padding: 0 0.1em;
    border-radius: 0.2em;
}

/* 空状態 */
.hc-content-empty {
    padding: 3rem 1.5rem;
    text-align: center;
    background: #ffffff;
    border: 1px dashed var(--color-base-border-divider, #e0e0e0);
    border-radius: 1rem;
    color: var(--color-text-sub, #4d4d4d);
}
.hc-content-empty__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-text-sub, #6b6b6b);
    margin-bottom: 1rem;
}
.hc-content-empty__icon .material-icons {
    font-size: 1.5rem !important;
}
.hc-content-empty__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-main, #1a1a1a);
    margin: 0 0 0.375rem;
}
.hc-content-empty__desc {
    font-size: 0.875rem;
    margin: 0 0 1.25rem;
}
.hc-content-empty__actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}
.hc-content-empty__link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.875rem;
    background: #ffffff;
    color: var(--color-brand-base-primary, #4285F4);
    border: 1px solid var(--color-brand-base-primary, #4285F4);
    border-radius: 9999px;
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.2s ease;
}
.hc-content-empty__link:hover {
    background: rgba(66, 133, 244, 0.08);
}

/* 記事詳細の刷新パーツ */
.hc-article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: var(--color-text-sub, #4d4d4d);
    margin-bottom: 1.25rem;
}
.hc-article-back {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    border-radius: 9999px;
    color: var(--color-brand-base-primary, #4285F4);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: background-color 0.2s ease;
}
.hc-article-back:hover {
    background: rgba(66, 133, 244, 0.08);
    text-decoration: underline;
}
.hc-article-back .material-icons { font-size: 1rem !important; }

/* フィードバックセクション（AA対応：ターゲット44px以上） */
.hc-feedback {
    margin-top: 3rem;
    padding: 1.75rem 1.5rem;
    background: #fafafa;
    border: 1px solid var(--color-base-border-divider, #e0e0e0);
    border-radius: 1rem;
    text-align: center;
}
.hc-feedback__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-main, #1a1a1a);
    margin: 0 0 1rem;
}
.hc-feedback__actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}
.hc-feedback__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    min-height: 2.75rem;       /* 44px */
    min-width: 5.5rem;
    padding: 0.625rem 1.25rem;
    background: #ffffff;
    color: var(--color-text-main, #1a1a1a);
    border: 1px solid var(--color-base-border-divider, #d0d0d0);
    border-radius: 9999px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.hc-feedback__btn:hover {
    background: rgba(66, 133, 244, 0.06);
    color: var(--color-brand-base-primary, #4285F4);
    border-color: var(--color-brand-base-primary, #4285F4);
}
.hc-feedback__btn:focus-visible {
    outline: 2px solid var(--color-brand-base-primary, #4285F4);
    outline-offset: 2px;
}
.hc-feedback__btn .material-icons { font-size: 1.125rem !important; }

.hc-feedback__done {
    font-size: 0.9375rem;
    color: var(--color-text-sub, #4d4d4d);
    margin: 0;
}
.hc-feedback__done .material-icons {
    color: #2e7d32;
    vertical-align: middle;
    margin-right: 0.25rem;
    font-size: 1.125rem !important;
}

/* 関連記事（シンプルなリスト） */
.hc-related {
    margin-top: 3rem;
}
.hc-related__title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-main, #1a1a1a);
    margin: 0 0 1rem;
}

/* 記事本文内のリンク：常時下線（WCAG 1.4.1対応） */
.help-article-body a,
.prose a {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}
.help-article-body a:hover,
.prose a:hover {
    text-decoration-thickness: 2px;
}

/* ============================================
   14. Reduced motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .hc-cat-card,
    .hc-pop-card,
    .hc-keywords__chip,
    .hc-cta__btn,
    .hc-sticky-search,
    .hc-cat-card__more .material-icons,
    .hc-content-item,
    .hc-content-item__chevron,
    .hc-feedback__btn,
    .hc-article-back {
        transition: none !important;
        transform: none !important;
    }
    .hc-cat-card:hover,
    .hc-pop-card:hover,
    .hc-keywords__chip:hover,
    .hc-cta__btn--primary:hover,
    .hc-cta__btn--ghost:hover,
    .hc-content-item:hover,
    .hc-content-item:hover .hc-content-item__chevron {
        transform: none !important;
    }
}