:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #edf3fa;
    --ink: #152033;
    --muted: #5e6b7f;
    --line: #dbe4ef;
    --navy: #081426;
    --navy-soft: #10233f;
    --accent: #2f7df4;
    --accent-strong: #175dcc;
    --cyan: #49d6e9;
    --purple: #7c6cff;
    --shadow: 0 24px 60px rgba(28, 48, 78, 0.12);
    --radius-lg: 28px;
    --radius-md: 20px;
    --radius-sm: 14px;
    --content-width: 1160px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
    line-height: 1.8;
    text-rendering: optimizeLegibility;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: inherit;
}

button,
input,
textarea,
select {
    font: inherit;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 9999;
    padding: 10px 16px;
    border-radius: 10px;
    background: #ffffff;
    color: #111827;
    transform: translateY(-160%);
    transition: transform 0.2s ease;
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(8, 20, 38, 0.92);
    color: #ffffff;
    backdrop-filter: blur(18px);
}

.site-header__inner {
    width: min(calc(100% - 40px), var(--content-width));
    min-height: 78px;
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 13px;
    color: #ffffff;
    text-decoration: none;
}

.site-brand__mark {
    width: 43px;
    height: 43px;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 13px;
    background: linear-gradient(135deg, var(--accent), var(--cyan));
    display: grid;
    place-items: center;
    font-size: 0.76rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    box-shadow: 0 10px 28px rgba(47, 125, 244, 0.28);
}

.site-brand__text {
    display: grid;
    line-height: 1.25;
}

.site-brand__text strong {
    font-size: 1.08rem;
    letter-spacing: 0.08em;
}

.site-brand__text small {
    margin-top: 3px;
    color: #a9b8cb;
    font-size: 0.68rem;
    letter-spacing: 0.04em;
}

.global-nav ul,
.mobile-nav ul,
.footer-nav ul,
.sidebar-nav {
    margin: 0;
    padding: 0;
    list-style: none;
}

.global-nav ul {
    display: flex;
    align-items: center;
    gap: 8px;
}

.global-nav a {
    display: block;
    padding: 10px 14px;
    border-radius: 10px;
    color: #dce7f5;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.global-nav a:hover,
.global-nav a:focus-visible {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.mobile-nav {
    display: none;
    position: relative;
}

.mobile-nav summary {
    cursor: pointer;
    padding: 8px 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    font-weight: 700;
    list-style: none;
}

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

.mobile-nav nav {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: min(280px, calc(100vw - 32px));
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    background: var(--navy-soft);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.3);
}

.mobile-nav a {
    display: block;
    padding: 12px;
    border-radius: 9px;
    color: #ffffff;
    text-decoration: none;
}

.mobile-nav a:hover,
.mobile-nav a:focus-visible {
    background: rgba(255, 255, 255, 0.1);
}

.site-main {
    min-height: 70vh;
}

.hero {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    background:
        radial-gradient(circle at 82% 18%, rgba(73, 214, 233, 0.18), transparent 26%),
        radial-gradient(circle at 18% 82%, rgba(124, 108, 255, 0.18), transparent 30%),
        linear-gradient(145deg, #071325 0%, #0c1e37 56%, #0e2946 100%);
    color: #ffffff;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.22;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: linear-gradient(to bottom, black, transparent 88%);
}

.hero__inner {
    width: min(calc(100% - 40px), var(--content-width));
    min-height: 620px;
    margin-inline: auto;
    padding: 120px 0 132px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
}

.hero__glow {
    position: absolute;
    z-index: -1;
    border-radius: 50%;
    filter: blur(20px);
    opacity: 0.5;
}

.hero__glow--one {
    top: 80px;
    right: 8%;
    width: 340px;
    height: 340px;
    background: rgba(47, 125, 244, 0.32);
}

.hero__glow--two {
    bottom: -130px;
    left: 4%;
    width: 290px;
    height: 290px;
    background: rgba(73, 214, 233, 0.2);
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.hero .eyebrow {
    color: #78e7f3;
}

.hero h1 {
    max-width: 850px;
    margin: 0;
    font-size: clamp(3rem, 7vw, 6.5rem);
    line-height: 1.04;
    letter-spacing: -0.05em;
}

.hero h1 span {
    background: linear-gradient(90deg, #ffffff, #7ee8f5 48%, #9b91ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero__lead {
    max-width: 710px;
    margin: 30px 0 0;
    color: #cbd7e8;
    font-size: clamp(1rem, 2vw, 1.18rem);
}

.hero__actions {
    margin-top: 38px;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.button {
    min-height: 52px;
    padding: 12px 22px;
    border: 1px solid transparent;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
    transform: translateY(-2px);
}

.button--primary {
    background: linear-gradient(135deg, var(--accent), #4fa7ff);
    color: #ffffff;
    box-shadow: 0 16px 34px rgba(47, 125, 244, 0.3);
}

.button--ghost {
    border-color: rgba(255, 255, 255, 0.22);
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
}

.content-shell {
    width: min(calc(100% - 40px), var(--content-width));
    margin-inline: auto;
    padding: 58px 0 90px;
}

.section {
    padding: 78px 0;
}

.section-heading {
    max-width: 700px;
    margin-bottom: 34px;
}

.section-heading--compact {
    margin-bottom: 22px;
}

.section-heading h2,
.editorial-policy h2 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.25;
    letter-spacing: -0.03em;
}

.section-heading > p:last-child {
    margin: 14px 0 0;
    color: var(--muted);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.feature-card {
    position: relative;
    overflow: hidden;
    min-height: 390px;
    padding: 36px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: -90px;
    right: -80px;
    width: 210px;
    height: 210px;
    border-radius: 50%;
    opacity: 0.16;
}

.feature-card--tools::before {
    background: var(--accent);
}

.feature-card--blog::before {
    background: var(--purple);
}

.feature-card__icon {
    width: 62px;
    height: 62px;
    margin-bottom: 46px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: var(--navy);
    color: #ffffff;
    font-size: 0.84rem;
    font-weight: 900;
    letter-spacing: 0.04em;
}

.feature-card__label {
    margin: 0 0 8px;
    color: var(--accent);
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.14em;
}

.feature-card h3 {
    margin: 0;
    font-size: 1.8rem;
}

.feature-card p:not(.feature-card__label) {
    margin: 14px 0 28px;
    color: var(--muted);
}

.feature-card > a {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--accent-strong);
    font-weight: 800;
    text-decoration: none;
}

.feature-card > a:hover span,
.feature-card > a:focus-visible span {
    transform: translateX(4px);
}

.feature-card > a span {
    transition: transform 0.2s ease;
}

.section--panel {
    padding: 54px;
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: var(--radius-lg);
    background: linear-gradient(145deg, var(--navy), #102a49);
    color: #ffffff;
    box-shadow: var(--shadow);
}

.section--panel .eyebrow {
    color: #75deec;
}

.topic-list {
    display: grid;
    gap: 1px;
    margin-top: 34px;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.topic-list article {
    padding: 28px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
    display: grid;
    grid-template-columns: 62px 1fr;
    gap: 22px;
}

.topic-list article > span {
    color: #73dce9;
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.12em;
}

.topic-list h3 {
    margin: 0;
    font-size: 1.28rem;
}

.topic-list p {
    margin: 8px 0 0;
    color: #b9c8db;
}

.editorial-policy {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 70px;
    align-items: start;
}

.editorial-policy__body {
    padding-top: 28px;
    color: var(--muted);
    font-size: 1.03rem;
}

.editorial-policy__body p {
    margin: 0;
}

.editorial-policy a {
    color: var(--accent-strong);
    font-weight: 800;
}

.ad-block {
    margin: 20px 0;
    text-align: center;
}

.ad-block__label {
    margin: 0 0 8px;
    color: #7c8798;
    font-size: 0.68rem;
    letter-spacing: 0.12em;
}

.ad-block__placeholder {
    min-height: 120px;
    padding: 20px;
    border: 1px dashed #b9c7d8;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.55);
    color: #64748b;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 4px;
}

.ad-block__placeholder small {
    color: #91a0b4;
}

.ad-block--wide {
    margin: 0 0 18px;
}

.ad-block--square .ad-block__placeholder {
    min-height: 240px;
}

.page-bottom {
    padding-top: 24px;
}

.page-bottom__ads {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.sidebar {
    display: grid;
    gap: 22px;
}

.sidebar-card {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
}

.sidebar-card h2 {
    margin: 0 0 16px;
    font-size: 1.1rem;
}

.sidebar-nav li + li {
    margin-top: 8px;
}

.sidebar-nav ul {
    margin: 8px 0 0 18px;
    padding: 0;
}

.sidebar-nav a {
    color: var(--ink);
    text-decoration: none;
}

.sidebar-nav a:hover,
.sidebar-nav a:focus-visible {
    color: var(--accent-strong);
}

.site-footer {
    background: var(--navy);
    color: #ffffff;
}

.site-footer__inner {
    width: min(calc(100% - 40px), var(--content-width));
    margin-inline: auto;
    padding: 54px 0 34px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 26px 50px;
    align-items: start;
}

.site-footer__brand strong {
    font-size: 1.16rem;
    letter-spacing: 0.08em;
}

.site-footer__brand p {
    margin: 6px 0 0;
    color: #a9b8cb;
    font-size: 0.86rem;
}

.footer-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px 22px;
}

.footer-nav a {
    color: #d7e2ef;
    font-size: 0.88rem;
    text-decoration: none;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
    color: #ffffff;
    text-decoration: underline;
}

.site-footer__copyright {
    grid-column: 1 / -1;
    margin: 14px 0 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    color: #8496ad;
}

@media (max-width: 820px) {
    .global-nav {
        display: none;
    }

    .mobile-nav {
        display: block;
    }

    .hero__inner {
        min-height: 540px;
        padding: 86px 0 96px;
    }

    .feature-grid,
    .editorial-policy,
    .page-bottom__ads {
        grid-template-columns: 1fr;
    }

    .editorial-policy {
        gap: 8px;
    }

    .section--panel {
        padding: 36px 26px;
    }

    .site-footer__inner {
        grid-template-columns: 1fr;
    }

    .footer-nav ul {
        justify-content: flex-start;
    }
}

@media (max-width: 560px) {
    .site-header__inner,
    .hero__inner,
    .content-shell,
    .site-footer__inner {
        width: min(calc(100% - 28px), var(--content-width));
    }

    .site-header__inner {
        min-height: 68px;
    }

    .site-brand__text small {
        display: none;
    }

    .hero h1 {
        font-size: clamp(2.8rem, 16vw, 4.5rem);
    }

    .hero__lead {
        line-height: 1.9;
    }

    .hero__actions,
    .button {
        width: 100%;
    }

    .section {
        padding: 56px 0;
    }

    .feature-card {
        min-height: auto;
        padding: 28px;
    }

    .feature-card__icon {
        margin-bottom: 34px;
    }

    .topic-list article {
        grid-template-columns: 42px 1fr;
        gap: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}


/* ==================================================
   Legal pages
   ================================================== */
.content-shell--narrow {
    max-width: 920px;
}

.legal-document {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.legal-document__header {
    padding: 64px 70px 48px;
    border-bottom: 1px solid var(--line);
    background:
        radial-gradient(circle at 88% 12%, rgba(73, 214, 233, 0.16), transparent 28%),
        linear-gradient(145deg, #f8fbff, #eef5fc);
}

.legal-document__header h1 {
    margin: 0;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    line-height: 1.15;
    letter-spacing: -0.045em;
}

.legal-document__lead {
    max-width: 700px;
    margin: 24px 0 0;
    color: var(--muted);
    font-size: 1.04rem;
}

.legal-document__date {
    margin: 24px 0 0;
    color: #7b8799;
    font-size: 0.86rem;
}

.legal-toc {
    margin: 46px 70px 16px;
    padding: 28px 32px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface-soft);
}

.legal-toc > p {
    margin: 0 0 14px;
    font-weight: 900;
    letter-spacing: 0.08em;
}

.legal-toc ol {
    margin: 0;
    padding-left: 1.4em;
    columns: 2;
    column-gap: 44px;
}

.legal-toc li {
    break-inside: avoid;
    margin: 4px 0;
}

.legal-toc a,
.legal-section a {
    color: var(--accent-strong);
    text-underline-offset: 0.18em;
}

.legal-section {
    margin: 0 70px;
    padding: 42px 0;
    border-top: 1px solid var(--line);
    scroll-margin-top: 100px;
}

.legal-toc + .legal-section {
    border-top: 0;
}

.legal-section:last-child {
    padding-bottom: 70px;
}

.legal-section h2 {
    margin: 0 0 20px;
    font-size: clamp(1.35rem, 3vw, 1.75rem);
    line-height: 1.45;
    letter-spacing: -0.02em;
}

.legal-section p {
    margin: 0;
}

.legal-section p + p {
    margin-top: 16px;
}

.legal-section ol,
.legal-section ul {
    margin: 0;
    padding-left: 1.5em;
}

.legal-section li + li {
    margin-top: 12px;
}

.legal-section li > ul,
.legal-section li > ol {
    margin-top: 10px;
}

@media (max-width: 700px) {
    .legal-document__header {
        padding: 44px 26px 34px;
    }

    .legal-toc {
        margin: 30px 22px 4px;
        padding: 22px;
    }

    .legal-toc ol {
        columns: 1;
    }

    .legal-section {
        margin: 0 26px;
        padding: 34px 0;
    }

    .legal-section:last-child {
        padding-bottom: 48px;
    }
}