/* About サイト — Sage Terrace（本番チャット UI）と統一 */

@import url('scrollbar.css');

body.about-page {
    --ui-primary: #5b7c99;
    --ui-primary-dark: #3d5a73;
    --ui-primary-soft: #e8eef4;
    --ui-accent: #c9846a;
    --ui-bg-outer: linear-gradient(165deg, #f5f3f0 0%, #ebe8e4 45%, #e2e6ec 100%);
    --ui-bg-chat: #faf9f7;
    --ui-bg-surface: #fff;
    --ui-bg-header: linear-gradient(180deg, #5b7c99 0%, #4d6d88 100%);
    --ui-text-on-primary: #fff;
    --ui-text: #2c3440;
    --ui-text-muted: #6b7280;
    --ui-border: #d4dce6;
    --ui-radius-md: 14px;
    --ui-radius-lg: 18px;
    --ui-font: "Segoe UI", "Helvetica Neue", "Hiragino Sans", "Yu Gothic UI", "BIZ UDPGothic", system-ui, sans-serif;
    --focus-color: #5b7c99;
    --about-border-soft: rgba(212, 220, 230, 0.85);
    --about-shadow: rgba(59, 90, 115, 0.1);
    margin: 0;
    color: var(--ui-text);
    font-family: var(--ui-font);
    font-size: 1rem;
    line-height: 1.75;
    position: relative;
    box-sizing: border-box;
    min-height: 100dvh;
    min-height: 100vh;
    height: 100dvh;
    max-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    overflow-x: hidden;
    text-align: left;
    -webkit-text-size-adjust: 100%;
    background: var(--ui-bg-outer);
    background-attachment: fixed;
}

html.about-doc {
    height: 100%;
    min-height: 100dvh;
    min-height: 100vh;
    overflow: hidden;
    overflow-x: hidden;
}

/* ビューポート右端のスクロールバー用に全幅。ヘッダー下〜画面下端まで flex で占有 */
body.about-page > .about-scroll {
    flex: 1 1 0%;
    min-height: 0;
    width: 100%;
    align-self: stretch;
    box-sizing: border-box;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.about-root {
    box-sizing: border-box;
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    min-width: 0;
    min-height: 100%;
    padding: 0 clamp(10px, 2.5vw, 18px) clamp(20px, 4vw, 32px);
    padding-left: max(clamp(10px, 2.5vw, 18px), env(safe-area-inset-left, 0px));
    padding-right: max(clamp(10px, 2.5vw, 18px), env(safe-area-inset-right, 0px));
    overflow-x: clip;
}

body.about-page > .about-skip {
    position: absolute;
    left: -9999px;
    z-index: 9999;
    padding: 0.55rem 1rem;
    background: var(--ui-primary-dark);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

body.about-page > .about-skip:focus {
    left: clamp(12px, 3vw, 24px);
    top: clamp(12px, 3vw, 24px);
    outline: 3px solid #fff;
    outline-offset: 2px;
}

.about-root .about-layout {
    background: #fff;
    border-radius: 16px;
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.06),
        0 12px 36px rgba(59, 90, 115, 0.1);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.06);
    margin-top: clamp(10px, 2.2vw, 16px);
    min-width: 0;
}

.about-root .about-shell {
    padding: clamp(14px, 3vw, 22px) clamp(14px, 3vw, 24px) clamp(20px, 4vw, 32px);
    min-width: 0;
}

/* Sage Terrace ヘッダー：main.css .chat-header の grid / 緑を上書き */
body.about-page .about-header.chat-header.about-header--about.about-header--site-top {
    box-sizing: border-box;
    flex-shrink: 0;
    width: 100%;
    max-width: 100%;
    padding-top: env(safe-area-inset-top, 0);
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    grid-template-columns: unset;
    grid-template-areas: unset;
    text-align: left;
    position: relative;
    z-index: 2000;
    background: var(--ui-bg-header);
    color: var(--ui-text-on-primary);
    border-radius: 0 0 16px 16px;
    overflow: visible;
    box-shadow:
        0 2px 8px rgba(59, 90, 115, 0.12),
        0 6px 20px rgba(59, 90, 115, 0.14);
    border: 1px solid rgba(61, 90, 115, 0.2);
}

body.about-page .about-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px max(10px, env(safe-area-inset-right, 0px)) 4px max(10px, env(safe-area-inset-left, 0px));
    flex-wrap: nowrap;
    position: relative;
    z-index: 2;
    overflow: visible;
    min-width: 0;
}

body.about-page .about-header-top-left {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 10px 12px;
    flex: 1;
    min-width: 0;
}

/* main.css の absolute を打ち消し、言語トグルを通常フローに */
body.about-page .about-header--about .language-selector {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    z-index: 1100;
    flex-shrink: 0;
    overflow: visible;
}

/* .chat-header の color:white 継承で白地に白文字になるのを防ぐ */
body.about-page .about-header--about .lang-dropdown {
    top: calc(100% + 4px);
    left: 0;
    margin-top: 0;
    z-index: 1101;
    background: #fff;
    color: #1a1a1a;
    border: 1px solid rgba(0, 0, 0, 0.12);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.14);
}

body.about-page .about-header--about .lang-dropdown .lang-option {
    color: #1a1a1a;
    background: #fff;
}

body.about-page .about-header--about .lang-dropdown .lang-option:hover {
    background: var(--ui-primary-soft);
    color: var(--ui-text);
}

body.about-page .about-header--about .lang-dropdown .lang-option.active {
    background: var(--ui-primary-soft);
    color: var(--ui-primary-dark);
    font-weight: 600;
}

body.about-page .about-nav--below {
    position: relative;
    z-index: 1;
    margin: 0;
    width: 100%;
    box-sizing: border-box;
    border-top: 1px solid rgba(255, 255, 255, 0.28);
    padding: 8px max(10px, env(safe-area-inset-right, 0px)) 8px max(10px, env(safe-area-inset-left, 0px));
    flex: none;
    min-width: 0;
}

body.about-page .about-nav--below .about-nav-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    list-style: none;
    margin: 0;
    padding: 0;
    justify-content: flex-start;
    max-width: 100%;
}

body.about-page .about-nav--below .about-nav-list li {
    flex: 0 1 auto;
}

body.about-page .about-nav--below .about-nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 6px 10px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
    line-height: 1.2;
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.35);
    transition: background 0.15s ease, border-color 0.15s ease;
    white-space: nowrap;
}

body.about-page .about-nav--below .about-nav-link__icon {
    display: none;
    align-items: center;
    justify-content: center;
    line-height: 0;
}

body.about-page .about-nav--below .about-nav-icon {
    width: 20px;
    height: 20px;
    display: block;
    flex-shrink: 0;
}

body.about-page .about-nav--below .about-nav-link:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.55);
}

body.about-page .about-nav--below .about-nav-link:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

body.about-page .about-nav--below .about-nav-link[aria-current="page"] {
    background: rgba(255, 255, 255, 0.38);
    border-color: rgba(255, 255, 255, 0.75);
}

@media (max-width: 640px) {
    body.about-page .about-nav--below {
        padding-top: 6px;
        padding-bottom: 6px;
    }

    body.about-page .about-nav--below .about-nav-list {
        flex-wrap: nowrap;
        justify-content: space-between;
        gap: 4px;
    }

    body.about-page .about-nav--below .about-nav-list li {
        flex: 1 1 0;
        min-width: 0;
    }

    body.about-page .about-nav--below .about-nav-link {
        width: 100%;
        aspect-ratio: 1;
        max-height: 44px;
        padding: 0;
        border-radius: 14px;
        background: rgba(255, 255, 255, 0.14);
        border-color: rgba(255, 255, 255, 0.28);
    }

    body.about-page .about-nav--below .about-nav-link[aria-current="page"] {
        background: rgba(255, 255, 255, 0.32);
        border-color: rgba(255, 255, 255, 0.62);
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
    }

    body.about-page .about-nav--below .about-nav-link__icon {
        display: flex;
    }

    body.about-page .about-nav--below .about-nav-icon {
        width: 21px;
        height: 21px;
    }

    body.about-page .about-nav--below .about-nav-link__label {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }
}

body.about-page .about-header-chat-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.22);
    border: 2px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
    transition: background 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

body.about-page .about-header-chat-icon:hover {
    background: rgba(255, 255, 255, 0.35);
    border-color: rgba(255, 255, 255, 0.65);
    transform: translateY(-1px);
}

body.about-page .about-header-chat-icon:focus-visible {
    outline: 3px solid #fff;
    outline-offset: 2px;
}

body.about-page .about-header-chat-icon img {
    display: block;
    width: 26px;
    height: 26px;
    object-fit: contain;
}

body.about-page .language-selector a.lang-option {
    box-sizing: border-box;
    text-decoration: none;
}

body.about-page .about-brand--header {
    margin: 0;
    padding: 0 4px 0 0;
    text-align: left;
    font-size: clamp(0.78rem, 2.2vw, 1.05rem);
    font-weight: 700;
    letter-spacing: 0.02em;
    line-height: 1.3;
    color: #fff;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

body.about-page .about-header--about .lang-toggle {
    padding: 6px 10px;
    font-size: 13px;
    min-width: 52px;
}

/* ── About header & shell — responsive (≈389px phones) ── */
@media (max-width: 767px) {
    body.about-page .about-header-chat-icon {
        width: 40px;
        height: 40px;
        border-radius: 18px;
    }

    body.about-page .about-header-chat-icon img {
        width: 22px;
        height: 22px;
    }

    .about-root:has(.about-index) .about-shell {
        padding: clamp(10px, 2.5vw, 16px) clamp(10px, 2.8vw, 14px) clamp(20px, 4vw, 28px);
    }

    .about-root:has(.about-index) .about-main {
        border-radius: var(--ui-radius-md);
    }

    .about-root .about-section {
        padding: clamp(0.85rem, 2.5vw, 1.15rem);
    }

    .about-root .about-hero {
        padding: clamp(0.85rem, 2.5vw, 1.15rem);
        border-radius: var(--ui-radius-md);
    }

    .about-root .about-site-footer {
        border-radius: var(--ui-radius-md);
        padding-inline: max(12px, env(safe-area-inset-left, 0px)) max(12px, env(safe-area-inset-right, 0px));
    }
}

@media (max-width: 520px) {
    body.about-page .about-brand--header {
        font-size: clamp(0.72rem, 3.4vw, 0.88rem);
    }

    body.about-page .about-header--about .lang-toggle {
        padding: 5px 8px;
        font-size: 12px;
        min-width: 48px;
    }
}

@media (max-width: 360px) {
    body.about-page .about-brand--header {
        font-size: 0.7rem;
        letter-spacing: 0.01em;
    }
}

.about-root .about-breadcrumb {
    margin-bottom: 0.85rem;
}

.about-root .about-breadcrumb-list {
    list-style: none;
    margin: 0;
    padding: 0.45rem 0.65rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem 0.5rem;
    font-size: 0.8125rem;
    color: #495057;
    background: var(--ui-bg-chat);
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.about-root .about-breadcrumb-list li {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.about-root .about-breadcrumb-list li:not(:last-child)::after {
    content: "›";
    color: #adb5bd;
    font-weight: 500;
    margin-left: 0.35rem;
    font-size: 0.95em;
}

.about-root .about-breadcrumb-list a {
    color: var(--ui-primary);
    text-decoration: none;
    font-weight: 600;
}

.about-root .about-breadcrumb-list a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.about-root .about-breadcrumb-list a:focus-visible {
    outline: 2px solid var(--focus-color, var(--ui-primary));
    outline-offset: 2px;
    border-radius: 4px;
}

.about-root .about-breadcrumb-list li[aria-current="page"] {
    font-weight: 700;
    color: #212529;
}

.about-root .about-main {
    padding: clamp(4px, 1vw, 8px) 0 0;
}

.about-root .about-subheading {
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    margin: 1.75rem 0 0.75rem;
    font-weight: 700;
    color: var(--ui-primary-dark);
    letter-spacing: 0.01em;
}

.about-root .about-prose h1 {
    font-size: clamp(1.35rem, 4vw, 1.75rem);
    margin: 0 0 1.1rem;
    color: #212529;
    line-height: 1.3;
    font-weight: 800;
    letter-spacing: -0.02em;
    padding: 0 0 0 0.65rem;
    border-left: 4px solid var(--ui-primary);
}

.about-root .about-prose h2 {
    font-size: clamp(1.02rem, 2.4vw, 1.15rem);
    margin: 1.65rem 0 0.55rem;
    color: var(--ui-primary-dark);
    font-weight: 700;
    line-height: 1.4;
}

/* Index section h2s use .about-section__heading — do not inherit subpage h2 sizing */
.about-root .about-index .about-section__heading {
    margin: 0;
}

.about-root .about-prose h2:first-of-type {
    margin-top: 0.25rem;
}

.about-root .about-prose p {
    margin: 0 0 1rem;
    color: #37474f;
    max-width: 62ch;
    line-height: 1.75;
    font-size: clamp(0.9375rem, 2.2vw, 1.02rem);
}

.about-root .about-intro p:last-child {
    margin-bottom: 0;
}

/* ── Index editorial refine: sage/cream, Delight / formin / Dentsu tone ── */

/* Index: flatter shell — avoid “box in box” admin-site feel; do not clip sections */
.about-root:has(.about-index) .about-layout {
    background: transparent;
    border: none;
    box-shadow: none;
    margin-top: clamp(6px, 1.5vw, 10px);
    overflow: visible;
}

.about-root:has(.about-index) .about-shell {
    padding: clamp(8px, 2vw, 14px) clamp(10px, 2.5vw, 18px) clamp(24px, 5vw, 40px);
}

.about-root:has(.about-index) {
    background: transparent;
}

.about-root {
    --about-sans:
        "BIZ UDPGothic",
        "Hiragino Kaku Gothic ProN",
        "Yu Gothic UI",
        "Yu Gothic",
        "Segoe UI",
        "Noto Sans JP",
        system-ui,
        sans-serif;
    font-family: var(--about-sans);
}

.about-root .about-index {
    --about-sage: #94a8bc;
    --about-cream: var(--ui-bg-chat);
    --about-mint: var(--ui-primary);
    --about-accent: var(--ui-primary);
    --about-ink: var(--ui-text);
    --about-muted: var(--ui-text-muted);
    --about-section-pad: clamp(1rem, 2.8vw, 1.5rem);
    font-family: var(--ui-font);
    color: var(--ui-text);
}

.about-root:has(.about-index) .about-main {
    background: rgba(255, 255, 255, 0.92);
    border-radius: var(--ui-radius-lg);
    border: 1px solid var(--about-border-soft);
    box-shadow: 0 12px 40px var(--about-shadow);
}

/* Readable copy: override chat-header / main.css inheritance on index */
body.about-page .about-root .about-main.about-prose .about-index {
    color: var(--ui-text);
}

body.about-page .about-root .about-main.about-prose .about-index p,
body.about-page .about-root .about-main.about-prose .about-index li,
body.about-page .about-root .about-main.about-prose .about-index figcaption {
    color: var(--ui-text-muted);
}

body.about-page .about-root .about-main.about-prose .about-index .about-hero__title,
body.about-page .about-root .about-main.about-prose .about-index .about-hero__subtitle,
body.about-page .about-root .about-main.about-prose .about-index .about-hero__badge,
body.about-page .about-root .about-main.about-prose .about-index .about-section__heading,
body.about-page .about-root .about-main.about-prose .about-index .about-section__lead,
body.about-page .about-root .about-main.about-prose .about-index .about-section__eyebrow,
body.about-page .about-root .about-main.about-prose .about-index .about-safety__heading,
body.about-page .about-root .about-main.about-prose .about-index .about-card__title,
body.about-page .about-root .about-main.about-prose .about-index .about-card__text,
body.about-page .about-root .about-main.about-prose .about-index .about-step__title,
body.about-page .about-root .about-main.about-prose .about-index .about-step__text,
body.about-page .about-root .about-main.about-prose .about-index .about-cta-band__title,
body.about-page .about-root .about-main.about-prose .about-index .about-cta-band__lead {
    color: var(--ui-text);
}

body.about-page .about-root .about-main.about-prose .about-index .about-hero__subtitle,
body.about-page .about-root .about-main.about-prose .about-index .about-card__text,
body.about-page .about-root .about-main.about-prose .about-index .about-step__text,
body.about-page .about-root .about-main.about-prose .about-index .about-cta-band__lead {
    color: var(--ui-text-muted);
}

body.about-page .about-root .about-main.about-prose .about-index .about-safety__lead {
    color: var(--ui-text);
}

body.about-page .about-root .about-main.about-prose .about-index img {
    opacity: 1;
    visibility: visible;
    max-width: 100%;
    height: auto;
}

.about-root .about-prose h1,
.about-root .about-prose h2,
.about-root .about-prose h3,
.about-root .about-section__heading,
.about-root .about-hero__title,
.about-root .about-safety__heading,
.about-root .about-cta-band__title,
.about-root .about-tech-diagram__title,
.about-root .about-tech-diagram__label,
.about-root .about-card__title,
.about-root .about-step__title {
    font-family: var(--about-sans);
}

.about-root .about-hero {
    display: grid;
    gap: clamp(1.25rem, 4vw, 2rem);
    margin: 0 0 clamp(1.25rem, 3.5vw, 2rem);
    padding: var(--about-section-pad);
    border-radius: var(--ui-radius-lg);
    border: 1px solid var(--about-border-soft);
    background:
        linear-gradient(148deg, rgba(255, 255, 255, 0.98) 0%, var(--ui-bg-chat) 52%, rgba(232, 238, 244, 0.95) 100%);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.85) inset,
        0 20px 48px var(--about-shadow);
    position: relative;
    overflow: hidden;
}

.about-root .about-hero::before {
    content: "";
    position: absolute;
    top: -20%;
    right: -8%;
    width: min(52%, 320px);
    aspect-ratio: 1;
    background: radial-gradient(circle, rgba(91, 124, 153, 0.12) 0%, transparent 68%);
    pointer-events: none;
}

@media (max-width: 767px) {
    .about-root .about-hero--editorial {
        display: flex;
        flex-direction: column;
    }

    .about-root .about-hero__copy {
        order: 1;
    }

    .about-root .about-hero__media {
        order: 2;
    }

    .about-root .about-hero__title {
        font-size: clamp(1.5rem, 6.5vw, 1.85rem);
    }

}

@media (min-width: 768px) {
    .about-root .about-hero--editorial {
        grid-template-columns: minmax(0, 1.05fr) minmax(260px, 0.95fr);
        align-items: center;
        min-height: min(52vh, 420px);
    }
}

.about-root .about-hero__badge {
    display: inline-block;
    margin: 0 0 0.65rem;
    padding: 0.35rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--ui-primary-dark);
    background: var(--ui-primary-soft);
    border: 1px solid var(--ui-border);
    border-radius: 999px;
    line-height: 1.35;
}

.about-root .about-prose .about-hero__title {
    margin: 0 0 0.85rem;
    font-size: clamp(1.75rem, 5.2vw, 2.65rem);
    line-height: 1.22;
    color: var(--about-ink);
    font-weight: 800;
    letter-spacing: 0.04em;
    border: none;
    border-left: none;
    padding: 0;
}

.about-root .about-hero__subtitle {
    margin: 0 0 1.35rem;
    color: var(--about-muted);
    font-size: clamp(0.95rem, 2.1vw, 1.06rem);
    line-height: 1.85;
    max-width: 36em;
    letter-spacing: 0.02em;
}

.about-root .about-hero__actions {
    margin-bottom: 0.5rem;
}


.about-root .about-hero__media {
    margin: 0;
    border-radius: var(--ui-radius-md);
    overflow: hidden;
    border: 1px solid var(--ui-border);
    background: var(--ui-bg-chat);
    box-shadow: 0 12px 32px var(--about-shadow);
}

.about-root .about-hero__img {
    display: block;
    width: 100%;
    height: auto;
    min-height: 0;
    object-fit: contain;
    object-position: center;
    background: var(--ui-bg-chat);
}

.about-root .about-section--sep {
    margin-top: 0;
    padding-top: clamp(1.5rem, 4vw, 2rem);
    border-top: 1px solid rgba(212, 220, 230, 0.22);
}

.about-root .about-section {
    margin-bottom: clamp(1.25rem, 3.5vw, 2rem);
    padding: clamp(1rem, 2.8vw, 1.5rem);
    border-radius: 14px;
}

.about-root .about-section--alt {
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(212, 220, 230, 0.22);
    box-shadow: 0 8px 28px rgba(59, 90, 115, 0.06);
}

.about-root .about-section__head {
    margin-bottom: clamp(1.1rem, 3vw, 1.65rem);
}

.about-root .about-section__head--inset {
    margin-bottom: 0.85rem;
}

.about-root .about-section__eyebrow {
    display: flex;
    align-items: baseline;
    gap: 0.65rem;
    margin: 0 0 0.55rem;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--about-sage);
    font-family: var(--about-sans);
}

.about-root .about-section__num {
    font-family: var(--about-sans);
    font-size: clamp(1.35rem, 3vw, 1.65rem);
    font-weight: 800;
    color: var(--about-accent);
    letter-spacing: 0.06em;
    line-height: 1;
}

.about-root .about-section__tag {
    opacity: 0.92;
}

.about-root .about-section__heading {
    font-size: clamp(1.25rem, 3.2vw, 1.55rem);
    margin: 0;
    color: var(--about-ink);
    font-weight: 800;
    line-height: 1.32;
    letter-spacing: 0.03em;
}

.about-root .about-section__lead {
    margin: 0.65rem 0 0;
    max-width: 42em;
    font-size: 0.9375rem;
    line-height: 1.75;
    color: var(--about-muted);
}

.about-root .about-problem__grid,
.about-root .about-feature__grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: clamp(1rem, 2.5vw, 1.35rem);
}

@media (min-width: 600px) {
    .about-root .about-problem__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.about-root .about-feature__grid {
    grid-template-columns: 1fr;
    max-width: none;
}

@media (min-width: 560px) {
    .about-root .about-feature__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.about-root .about-hero__highlights {
    list-style: none;
    margin: 0 0 1.15rem;
    padding: 0;
    display: grid;
    gap: 0.55rem;
    max-width: 38em;
}

.about-root .about-hero__highlights li {
    position: relative;
    padding-left: 1.1rem;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--ui-text-muted);
}

.about-root .about-hero__highlights li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.58em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ui-primary);
}

.about-root .about-card--problem .about-card__body {
    min-height: 7.5rem;
}

.about-root .about-card {
    background: #fff;
    border: 1px solid rgba(212, 220, 230, 0.28);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(44, 52, 64, 0.06);
    transition:
        transform 0.22s ease,
        box-shadow 0.22s ease,
        border-color 0.22s ease;
}

.about-root .about-card--problem:hover,
.about-root .about-card--problem:focus-within {
    transform: translateY(-4px);
    box-shadow: 0 14px 32px rgba(59, 90, 115, 0.12);
    border-color: rgba(91, 124, 153, 0.45);
}

.about-root .about-card--feature {
    display: block;
    padding: 1rem 1.15rem 1.1rem;
    text-align: left;
}

.about-root .about-card--feature .about-card__title {
    margin: 0 0 0.4rem;
    text-align: left;
}

.about-root .about-card--feature .about-card__text {
    margin: 0;
    text-align: left;
}

.about-root .about-card--feature:hover,
.about-root .about-card--feature:focus-within {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(59, 90, 115, 0.1);
}

.about-root .about-card__img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.about-root .about-card__icon {
    display: block;
    width: 80px;
    height: 80px;
    min-height: 80px;
    margin: 0 auto 0.55rem;
    object-fit: contain;
    object-position: center;
}

.about-root .about-card__body {
    padding: 1rem 1.05rem 1.15rem;
}

.about-root .about-card__title {
    margin: 0 0 0.45rem;
    font-size: clamp(1rem, 2.2vw, 1.05rem);
    color: var(--about-ink);
    font-weight: 800;
    line-height: 1.35;
    font-family: var(--about-sans);
}

.about-root .about-card--feature .about-card__title {
    margin-top: 0.15rem;
}

.about-root .about-card--feature .about-card__text {
    flex: 1;
}

.about-root .about-card__emoji {
    margin-right: 0.15rem;
}

.about-root .about-card__text {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.6;
    color: #455a64;
}

.about-root .about-how__steps--timeline {
    list-style: none;
    margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
    padding: 0;
    display: grid;
    gap: clamp(0.85rem, 2vw, 1.15rem);
}

@media (min-width: 720px) {
    .about-root .about-how__steps--timeline {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
        position: relative;
    }

    .about-root .about-how__steps--timeline::before {
        content: "";
        position: absolute;
        top: 2.1rem;
        left: 8%;
        right: 8%;
        height: 2px;
        background: linear-gradient(90deg, transparent, var(--about-sage), transparent);
        opacity: 0.45;
        z-index: 0;
    }
}

.about-root .about-step {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    padding: 1.1rem 1rem 1.15rem;
    background: var(--about-cream);
    border-radius: 16px;
    border: 1px solid rgba(212, 220, 230, 0.32);
    position: relative;
    z-index: 1;
}

@media (min-width: 720px) {
    .about-root .about-step {
        min-height: 11.5rem;
    }
}

.about-root .about-step__marker {
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.about-root .about-step__num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    min-height: 2.75rem;
    font-size: clamp(1.35rem, 3vw, 1.65rem);
    font-weight: 800;
    font-family: var(--about-sans);
    color: #fff;
    background: linear-gradient(145deg, var(--about-mint) 0%, var(--about-accent) 100%);
    border-radius: 50%;
    line-height: 1;
    box-shadow: 0 4px 12px rgba(59, 90, 115, 0.28);
}

.about-root .about-step__title {
    margin: 0 0 0.3rem;
    font-size: 0.95rem;
    color: var(--ui-text);
    font-weight: 700;
}

.about-root .about-step__text {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.55;
    color: #455a64;
}

.about-root .about-how__demo--product {
    margin: 0;
    border-radius: var(--ui-radius-lg);
    overflow: hidden;
    border: 1px solid var(--about-border-soft);
    background: var(--ui-bg-surface);
    box-shadow: 0 16px 40px var(--about-shadow);
}

.about-root .about-how__demo-strip {
    display: flex;
    gap: clamp(0.75rem, 2.5vw, 1.1rem);
    margin: 0;
    padding: clamp(0.85rem, 2.5vw, 1.15rem);
    list-style: none;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    background: var(--ui-bg-chat);
}

.about-root .about-how__demo-shot {
    flex: 0 0 min(72vw, 220px);
    scroll-snap-align: start;
}

@media (min-width: 720px) {
    .about-root .about-how__demo-strip {
        justify-content: center;
    }

    .about-root .about-how__demo-shot {
        flex: 0 0 min(22%, 200px);
    }
}

.about-root .about-how__demo--product img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center top;
    border-radius: var(--ui-radius-md);
    border: 1px solid var(--ui-border);
    background: var(--ui-bg-surface);
    box-shadow: 0 8px 24px rgba(59, 90, 115, 0.12);
}

.about-root .about-how__demo--product figcaption {
    margin: 0;
    padding: 0.7rem 1rem;
    font-size: 0.8125rem;
    line-height: 1.5;
    color: var(--ui-text-muted);
    background: var(--ui-bg-chat);
    border-top: 1px solid var(--ui-border);
}

.about-root .about-safety {
    margin-bottom: clamp(2.25rem, 6vw, 3.5rem);
    padding: 0;
    border-radius: var(--ui-radius-lg);
    border: 1px solid var(--about-border-soft);
    background: linear-gradient(165deg, rgba(255, 255, 255, 0.98) 0%, var(--ui-bg-chat) 100%);
    box-shadow: 0 10px 36px var(--about-shadow);
}

.about-root .about-safety__inner {
    padding: clamp(0.95rem, 2.5vw, 1.25rem) clamp(1rem, 2.8vw, 1.35rem);
}

.about-root .about-safety__heading {
    margin: 0;
    font-size: clamp(1.15rem, 2.8vw, 1.35rem);
    color: var(--about-ink);
    font-weight: 800;
}

.about-root .about-safety__lead {
    margin: 0 0 0.65rem;
    font-weight: 700;
    color: #37474f;
    font-size: 0.95rem;
}

.about-root .about-safety__list {
    margin: 0 0 0.85rem;
    padding-left: 1.2rem;
    color: #37474f;
    line-height: 1.65;
    font-size: 0.9rem;
}

.about-root .about-safety__pharmacist {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    padding-top: 0.65rem;
    border-top: 1px solid rgba(59, 90, 115, 0.2);
}

.about-root .about-safety__pharmacist-icon {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    font-size: 1.65rem;
    line-height: 1;
    border-radius: 50%;
    background: var(--ui-primary-soft);
    border: 1px solid var(--ui-border);
}

.about-root .about-safety__pharmacist img {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.about-root .about-safety__pharmacist p {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.55;
    color: #455a64;
}

.about-root .about-tech__lead {
    margin: 0 0 1rem;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--about-muted);
}

/* Tech stack — LAPRAS-style dashed boxes + skillicons.dev */
.about-root .about-tech-diagram {
    margin: 0 0 1.15rem;
    padding: 0;
    min-height: 120px;
}

.about-root .about-tech-diagram__title {
    margin: 0 0 0.85rem;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-align: center;
    color: #546e7a;
}

.about-root .about-tech-diagram__grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr) minmax(0, 1fr);
    grid-template-rows: auto auto auto;
    gap: 0.65rem 0.5rem;
    margin: 0 0 0.85rem;
    padding: 0.35rem;
}

.about-root .about-tech-diagram__box {
    position: relative;
    z-index: 2;
    box-sizing: border-box;
    border: 2px dashed #b0bec5;
    border-radius: 12px;
    background: #fafbfc;
    padding: 0.7rem 0.65rem 0.55rem;
    text-align: center;
}

.about-root .about-tech-diagram__box--dashed {
    border-color: var(--ui-border);
    background: var(--ui-primary-soft);
}

.about-root .about-tech-diagram__box--ops {
    grid-column: 2;
    grid-row: 1;
}

.about-root .about-tech-diagram__box--frontend {
    grid-column: 1;
    grid-row: 2;
}

.about-root .about-tech-diagram__box--app {
    grid-column: 2;
    grid-row: 2;
    border-color: #8fa89a;
    background: #f4f8f6;
}

.about-root .about-tech-diagram__box--agents {
    grid-column: 3;
    grid-row: 3;
}

.about-root .about-tech-diagram__box--external {
    grid-column: 3;
    grid-row: 2;
}

.about-root .about-tech-diagram__box--data {
    grid-column: 2;
    grid-row: 3;
}

.about-root .about-tech-diagram__label {
    margin: 0 0 0.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: #37474f;
    line-height: 1.35;
}

.about-root .about-tech-diagram__icons {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.35rem 0.45rem;
}

.about-root .about-tech-diagram__icon {
    display: block;
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 12px;
}

/* Official brand PNGs (OpenAI / DeepL / Neon) — align with skillicons 48px tiles */
.about-root .about-tech-diagram__icon--brand {
    box-sizing: border-box;
    padding: 2px;
    object-fit: contain;
    border-radius: 12px;
    background: #242938;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.about-root .about-tech-diagram__icon--brand-openai {
    padding: 6px;
    background: #fff;
}

.about-root .about-tech-diagram__icon--brand-deepl {
    padding: 4px;
    background: #0f2b46;
}

.about-root .about-tech-diagram__icon--brand-resend {
    padding: 4px;
    background: #000;
}

.about-root .about-tech-diagram__icon--brand-neon {
    box-sizing: border-box;
    width: 48px;
    height: 48px;
    padding: 8px;
    background: #000;
    object-fit: contain;
    object-position: center;
}

.about-root .about-tech-diagram__note {
    margin: 0.45rem 0 0;
    font-size: 0.6875rem;
    line-height: 1.45;
    color: #607d8b;
}

@media (max-width: 640px) {
    .about-root .about-tech-diagram__grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(6, auto);
        gap: 0.55rem;
    }

    .about-root .about-tech-diagram__box--ops,
    .about-root .about-tech-diagram__box--frontend,
    .about-root .about-tech-diagram__box--app,
    .about-root .about-tech-diagram__box--agents,
    .about-root .about-tech-diagram__box--external,
    .about-root .about-tech-diagram__box--data {
        grid-column: 1;
        grid-row: auto;
    }

}

.about-root .about-trust--no-head {
    padding-top: clamp(1rem, 2.8vw, 1.5rem);
}

.about-root .about-tech__details {
    border: 1px solid rgba(212, 220, 230, 0.28);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.85);
    overflow: hidden;
}

.about-root .about-tech__details summary {
    cursor: pointer;
    padding: 0.9rem 1.1rem;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    color: var(--about-accent);
    list-style: none;
    user-select: none;
    transition: background 0.15s ease;
}

.about-root .about-tech__details summary:hover {
    background: rgba(232, 242, 236, 0.6);
}

.about-root .about-tech__details summary::-webkit-details-marker {
    display: none;
}

.about-root .about-tech__bullets {
    margin: 0;
    padding: 0 1.15rem 1rem 2.1rem;
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--about-muted);
}

.about-root .about-trust__lead {
    margin: 0 0 1rem;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--about-muted);
}

.about-root .about-trust__cards {
    list-style: none;
    margin: 0 0 1rem;
    padding: 0;
    display: grid;
    gap: 0.75rem;
    grid-template-columns: 1fr;
}

@media (min-width: 560px) {
    .about-root .about-trust__cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

.about-root .about-trust__card {
    padding: 0.85rem 1rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(212, 220, 230, 0.25);
}

.about-root .about-trust__card-title {
    margin: 0 0 0.35rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--about-accent);
    letter-spacing: 0.02em;
}

.about-root .about-trust__card-body {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.6;
    color: #37474f;
}

.about-root .about-trust__note {
    margin: 0;
    padding: 0.75rem 0.9rem;
    font-size: 0.85rem;
    line-height: 1.55;
    color: var(--ui-text-muted);
    background: var(--ui-primary-soft);
    border-radius: 10px;
    border: 1px solid var(--about-border-soft);
}

.about-root .about-cta-band {
    margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
    padding: clamp(1.15rem, 3vw, 1.65rem);
    text-align: center;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(212, 220, 230, 0.3);
    box-shadow: 0 8px 24px rgba(59, 90, 115, 0.07);
}

.about-root .about-cta-band__title {
    margin: 0 0 0.5rem;
    font-size: clamp(1.2rem, 3vw, 1.45rem);
    font-weight: 800;
    color: var(--about-ink);
    letter-spacing: 0.03em;
}

.about-root .about-cta-band__lead {
    margin: 0 auto 1.25rem;
    max-width: 36em;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--about-muted);
}

.about-root .about-cta-band__note {
    margin: 0.85rem 0 0;
    font-size: 0.8125rem;
    color: #6c757d;
}

.about-root .about-cta-primary--hero,
.about-root .about-cta-primary--large {
    padding: 0.9rem 1.85rem;
    font-size: 1.02rem;
    letter-spacing: 0.05em;
}

.about-root .about-cta-primary--large {
    min-width: min(100%, 280px);
    box-shadow:
        0 4px 16px rgba(91, 124, 153, 0.4),
        0 1px 0 rgba(255, 255, 255, 0.25) inset;
}

@media (prefers-reduced-motion: reduce) {
    .about-root .about-subpages a,
    .about-root .about-cta-primary,
    .about-root .about-card {
        transition: none;
    }

}

.about-root .about-subpages {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
    display: grid;
    gap: 0.55rem;
}

@media (min-width: 560px) {
    .about-root .about-subpages {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.65rem;
    }
}

.about-root .about-subpages a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.95rem 1.1rem;
    background: linear-gradient(180deg, #fafbfc 0%, #f1f3f5 100%);
    border: 1px solid #e9ecef;
    border-radius: 12px;
    color: #212529;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.about-root .about-subpages a::after {
    content: "→";
    color: var(--ui-primary);
    font-weight: 700;
    flex-shrink: 0;
}

.about-root .about-subpages a:hover {
    border-color: rgba(91, 124, 153, 0.45);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.about-root .about-subpages a:focus-visible {
    outline: 2px solid var(--focus-color, var(--ui-primary));
    outline-offset: 2px;
}

.about-root .about-cta-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 0;
    padding: 0.82rem 1.65rem;
    background: linear-gradient(135deg, var(--ui-primary) 0%, var(--ui-primary-dark) 100%);
    color: #fff !important;
    font-weight: 700;
    text-decoration: none;
    border-radius: 999px;
    box-shadow:
        0 2px 8px rgba(91, 124, 153, 0.35),
        0 1px 0 rgba(255, 255, 255, 0.2) inset;
    border: 1px solid rgba(61, 90, 115, 0.15);
    cursor: pointer;
    font-size: 1rem;
    letter-spacing: 0.03em;
    transition: filter 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.about-root .about-cta-primary:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(91, 124, 153, 0.4);
}

.about-root .about-cta-primary:focus-visible {
    outline: 3px solid var(--ui-primary-dark);
    outline-offset: 3px;
}

.about-root .about-footer-cta {
    margin-top: 2.25rem;
    padding-top: 1.35rem;
    border-top: 1px solid #e9ecef;
}

.about-root .about-footer-cta .about-cta-primary {
    margin-top: 0;
}

.about-root .about-footer-note {
    margin-top: 0.85rem;
    font-size: 0.8125rem;
    color: #6c757d;
    max-width: 62ch;
    line-height: 1.55;
}

.about-root .about-h1 {
    font-size: clamp(1.35rem, 4vw, 1.75rem);
    margin: 0 0 1rem;
    line-height: 1.25;
    color: var(--ui-primary-dark);
}

.about-root .about-modal-mirror {
    margin-top: 0.25rem;
    text-align: left;
}

.about-root .about-modal-mirror .info-section {
    text-align: left;
}

.about-root hr.about-policies-separator {
    margin: 2rem 0;
    border: 0;
    border-top: 1px solid #dee2e6;
}

/* /about/policies: 免責 + プライバシーをアコーディオン（初期 open） */
.about-root .about-policy-accordion {
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    margin-bottom: 1rem;
    background: var(--ui-bg-chat);
    overflow: hidden;
}

.about-root .about-policy-accordion summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 16px;
    font-weight: 700;
    color: var(--ui-primary-dark);
    border-bottom: 2px solid var(--ui-primary);
    user-select: none;
}

.about-root .about-policy-accordion summary::-webkit-details-marker {
    display: none;
}

.about-root .about-policy-accordion summary::after {
    content: "";
    float: right;
    width: 0.5em;
    height: 0.5em;
    margin-top: 0.35em;
    border-right: 2px solid var(--ui-primary-dark);
    border-bottom: 2px solid var(--ui-primary-dark);
    transform: rotate(45deg);
    transition: transform 0.2s ease;
}

.about-root .about-policy-accordion[open] summary::after {
    transform: rotate(-135deg);
    margin-top: 0.55em;
}

.about-root .about-policy-accordion-panel {
    padding: 12px 14px 18px;
    background: #fff;
}

.about-root .about-policy-accordion-panel .info-section {
    margin-bottom: 0;
}

/* サイト共通フッター（本文カード .about-layout とは別ブロック） */
.about-root .about-site-footer {
    margin-top: clamp(14px, 2.8vw, 22px);
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.05),
        0 8px 28px rgba(59, 90, 115, 0.08);
    padding: 1rem clamp(14px, 3vw, 22px) 1.25rem;
    font-size: 0.875rem;
    color: var(--ui-text-muted);
    background: var(--ui-bg-chat);
}

.about-root .about-site-footer-inner {
    max-width: 72ch;
    margin: 0 auto;
}

.about-root .about-site-footer-note {
    margin: 0 0 0.6rem;
    line-height: 1.55;
}

.about-root .about-site-footer-links {
    margin: 0 0 0.5rem;
}

.about-root .about-site-footer-links a {
    color: var(--ui-primary);
    font-weight: 600;
    text-decoration: none;
}

.about-root .about-site-footer-links a:hover {
    text-decoration: underline;
}

.about-root .about-site-footer-sep {
    display: inline-block;
    padding: 0 0.4rem;
    color: #adb5bd;
    font-weight: 400;
}

.about-root .about-site-footer-rights {
    margin: 0;
    font-size: 0.8125rem;
    color: #868e96;
}