/* ================================================================
   Layout — Base design system shared across all pages
   ================================================================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.doc-body {
    font-family: 'Inter', 'Noto Sans JP', var(--toddyi-font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

.doc-bg {
    position: fixed;
    inset: 0;
    z-index: -2;
    background-color: var(--bg);
    background-image:
        linear-gradient(
            180deg,
            color-mix(in srgb, var(--bg) 84%, transparent) 0%,
            color-mix(in srgb, var(--bg) 76%, transparent) 100%
        ),
        url('../docs-bg.webp');
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.doc-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.22;
    background-image:
        linear-gradient(var(--toddyi-grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--toddyi-grid-line) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: linear-gradient(180deg, black, transparent 85%);
}

/* --- Site Header --- */
.site-header {
    background: var(--toddyi-gradient-header);
    padding: 0;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 8px 32px color-mix(in srgb, var(--toddyi-primary-dark) 25%, transparent);
}

.site-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 80% at 80% 40%, color-mix(in srgb, var(--toddyi-secondary) 28%, transparent), transparent 55%),
        radial-gradient(circle at 15% 85%, color-mix(in srgb, var(--toddyi-accent-cyan) 12%, transparent), transparent 40%);
    pointer-events: none;
}

.site-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--toddyi-secondary) 60%, transparent), transparent);
}

.site-header__inner {
    position: relative;
    z-index: 1;
    max-width: 980px;
    margin: 0 auto;
    padding: 40px 28px 36px;
    text-align: center;
}

.site-header__brand {
    display: inline-flex;
    flex-direction: column;
    gap: 6px;
    text-decoration: none;
    color: inherit;
}

.site-header__org {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: color-mix(in srgb, var(--text-on-dark) 70%, transparent);
}

.site-header__title {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 900;
    letter-spacing: 0.08em;
    color: var(--text-on-dark);
    text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
    line-height: 1.1;
}

.site-header__tagline {
    margin-top: 12px;
    font-size: 0.88rem;
    font-weight: 500;
    color: color-mix(in srgb, var(--text-on-dark) 82%, transparent);
    letter-spacing: 0.04em;
}

/* Legacy header (terms/privacy if any inline) */
header:not(.site-header) {
    background: var(--toddyi-gradient-header);
    padding: 52px 24px 44px;
    text-align: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

header:not(.site-header) h1 {
    font-size: 2.6rem;
    font-weight: 900;
    letter-spacing: 0.13em;
    text-transform: uppercase;
    color: var(--text-on-dark);
    position: relative;
    z-index: 1;
}

/* --- Language Nav --- */
.lang-nav {
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    position: sticky;
    top: 0;
    z-index: 200;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.lang-nav__link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 6px 18px;
    border-radius: 99px;
    border: 1px solid var(--border);
    transition: all var(--transition);
    letter-spacing: 0.04em;
}

.lang-nav__link:hover {
    background: color-mix(in srgb, var(--primary) 10%, var(--surface));
    color: var(--primary);
    border-color: color-mix(in srgb, var(--primary) 25%, var(--border));
}

.lang-nav__link.is-active {
    background: var(--toddyi-gradient-primary);
    color: var(--text-on-dark);
    border-color: transparent;
    box-shadow: 0 4px 14px color-mix(in srgb, var(--toddyi-primary) 25%, transparent);
}

/* --- Main Content Box --- */
.box {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    padding: 48px 28px 80px;
    flex: 1;
}

.box > main {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) + 2px);
    box-shadow: var(--shadow-lg);
    padding: 32px;
}

.box:has(.toddyi-page) > main {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
}

/* --- Stat Cards --- */
.stats {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.stats .card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(150deg, var(--accent-light) 0%, var(--surface) 60%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.stats .card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    display: block;
    line-height: 1.1;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.hero-img {
    width: 100%;
    height: 260px;
    border-radius: var(--radius);
    object-fit: cover;
    object-position: top;
    border: 1px solid var(--border);
    margin-bottom: 32px;
    display: block;
}

.desc {
    border-top: 2px solid var(--border);
    padding-top: 32px;
}

.desc h2 {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.desc h2::before {
    content: '';
    display: block;
    width: 4px;
    height: 20px;
    background: var(--accent);
    border-radius: 99px;
    flex-shrink: 0;
}

.info-row {
    display: flex;
    align-items: flex-start;
    padding: 13px 0;
    border-bottom: 1px solid var(--bg);
    gap: 20px;
}

.info-row:last-child {
    border-bottom: none;
}

.label {
    font-weight: 700;
    color: var(--text-muted);
    width: 150px;
    flex-shrink: 0;
    font-size: 0.73rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-top: 3px;
}

.val {
    color: var(--text);
    font-weight: 500;
    flex: 1;
    font-size: 0.93rem;
}

.val a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

.val a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.version-info-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin: -8px auto 32px;
    flex-wrap: wrap;
}

.v-badge {
    background: var(--accent-light);
    color: var(--primary-mid);
    padding: 4px 14px;
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: 700;
    border: 1px solid color-mix(in srgb, var(--toddyi-secondary) 30%, transparent);
}

.v-date {
    font-size: 0.77rem;
    color: var(--text-muted);
}

.footer-actions {
    margin-top: 56px;
    text-align: center;
}

.site-footer {
    background: var(--toddyi-primary-dark);
    color: var(--text-footer);
    text-align: center;
    padding: 32px 24px;
    font-size: 0.82rem;
    line-height: 1.8;
    flex-shrink: 0;
}

.site-footer p {
    margin-bottom: 4px;
}

.site-footer a {
    color: var(--toddyi-secondary);
    text-decoration: none;
}

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

footer:not(.site-footer) {
    background: var(--toddyi-primary-dark);
    color: var(--text-footer);
    text-align: center;
    padding: 32px 24px;
    font-size: 0.82rem;
}

@media (max-width: 640px) {
    .site-header__inner {
        padding: 28px 16px 24px;
    }

    .box {
        padding: 28px 16px 60px;
    }

    .box > main {
        padding: 20px 16px;
    }

    .stats {
        flex-direction: column;
    }

    .info-row {
        flex-direction: column;
        gap: 4px;
    }

    .label {
        width: 100%;
    }
}

/* --- Landing page shell --- */
.doc-body--landing .doc-bg {
    background-image:
        linear-gradient(
            180deg,
            color-mix(in srgb, var(--bg) 78%, transparent) 0%,
            color-mix(in srgb, var(--bg) 68%, transparent) 100%
        ),
        url('../docs-bg.webp');
}

.doc-body--landing .doc-bg::after {
    opacity: 0.14;
    background-size: 64px 64px;
}

@media (max-width: 768px) {
    .doc-bg {
        background-attachment: scroll;
        background-position: center top;
    }
}

.doc-body--landing .site-header--landing {
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--border);
}

.doc-body--landing .site-header--landing::before,
.doc-body--landing .site-header--landing::after {
    display: none;
}

.doc-body--landing .site-header--landing .site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    max-width: 1080px;
    padding: 14px 24px;
    text-align: left;
}

.doc-body--landing .site-header__brand {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.doc-body--landing .site-header__org {
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    color: var(--text-muted);
}

.doc-body--landing .site-header__cta {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: 99px;
    font-size: 0.82rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-on-dark);
    background: var(--toddyi-gradient-primary);
    box-shadow: 0 4px 14px color-mix(in srgb, var(--toddyi-primary) 18%, transparent);
    white-space: nowrap;
    transition: transform var(--transition), box-shadow var(--transition);
}

.doc-body--landing .site-header__cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px color-mix(in srgb, var(--toddyi-primary) 24%, transparent);
}

.doc-body--landing .lang-nav {
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    border-bottom: 1px solid var(--border);
    box-shadow: none;
}

.doc-body--landing .box {
    padding-top: 24px;
    padding-bottom: 64px;
}

@media (max-width: 640px) {
    .doc-body--landing .site-header--landing .site-header__inner {
        padding: 12px 16px;
    }

    .doc-body--landing .site-header__cta {
        padding: 7px 12px;
        font-size: 0.76rem;
    }
}