/* =========================================================
   すこやかデジタル — design system
   Palette: indigo + emerald + apricot
   ========================================================= */

:root {
  --sd-primary: #2563EB;      /* indigo-blue */
  --sd-primary-dark: #1D4ED8;
  --sd-secondary: #16A34A;    /* emerald-green */
  --sd-secondary-dark: #15803D;
  --sd-accent: #FBBF6B;       /* apricot */
  --sd-ink: #1E293B;          /* deep slate */
  --sd-ink-soft: #475569;
  --sd-bg: #FFFDF7;           /* warm white */
  --sd-surface: #FFFFFF;
  --sd-line: #E8EEF5;         /* soft blue-gray */
  --sd-line-strong: #D4DEEC;
  --sd-shadow: 0 6px 24px rgba(30, 41, 59, .08);
  --sd-shadow-sm: 0 2px 8px rgba(30, 41, 59, .06);
  --sd-radius: 14px;
  --sd-radius-lg: 22px;
  --sd-maxw: 1140px;
  --sd-readw: 760px;
  --sd-font-head: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --sd-font-body: "BIZ UDPGothic", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --sd-font-round: "Kosugi Maru", "Hiragino Maru Gothic ProN", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sd-font-body);
  font-size: 17px;
  line-height: 1.9;
  color: var(--sd-ink);
  background: var(--sd-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--sd-primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { font-family: var(--sd-font-head); line-height: 1.4; color: var(--sd-ink); }

.sd-container { width: 100%; max-width: var(--sd-maxw); margin: 0 auto; padding: 0 20px; }

/* skip link */
.sd-skip {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--sd-primary); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.sd-skip:focus { left: 0; }

/* ---------- Header ---------- */
.sd-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 253, 247, .92);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--sd-line);
}
.sd-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px; max-width: var(--sd-maxw); margin: 0 auto; }
.sd-logo { display: flex; align-items: center; gap: 10px; font-family: var(--sd-font-round); font-weight: 700; font-size: 20px; color: var(--sd-ink); }
.sd-logo:hover { text-decoration: none; }
.sd-logo__mark {
  width: 38px; height: 38px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, var(--sd-primary), var(--sd-secondary));
  display: grid; place-items: center; color: #fff; font-size: 20px; box-shadow: var(--sd-shadow-sm);
}
.sd-logo__sub { font-family: var(--sd-font-body); font-size: 11px; color: var(--sd-ink-soft); display: block; line-height: 1; margin-top: 2px; font-weight: 400; }

.sd-nav { display: flex; align-items: center; gap: 4px; }
.sd-nav a { color: var(--sd-ink); padding: 8px 12px; border-radius: 8px; font-size: 15px; font-family: var(--sd-font-head); }
.sd-nav a:hover { background: var(--sd-line); text-decoration: none; }
.sd-nav__cta { background: var(--sd-primary); color: #fff !important; }
.sd-nav__cta:hover { background: var(--sd-primary-dark) !important; }

.sd-burger { display: none; background: none; border: 1px solid var(--sd-line-strong); border-radius: 10px; width: 44px; height: 44px; cursor: pointer; align-items: center; justify-content: center; }
.sd-burger span { display: block; width: 22px; height: 2px; background: var(--sd-ink); position: relative; }
.sd-burger span::before, .sd-burger span::after { content: ""; position: absolute; left: 0; width: 22px; height: 2px; background: var(--sd-ink); }
.sd-burger span::before { top: -7px; } .sd-burger span::after { top: 7px; }

@media (max-width: 880px) {
  .sd-burger { display: inline-flex; }
  .sd-nav {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: stretch;
    background: var(--sd-surface); border-bottom: 1px solid var(--sd-line);
    padding: 12px 20px 20px; gap: 2px; box-shadow: var(--sd-shadow);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .18s ease;
  }
  .sd-nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .sd-nav a { padding: 12px 10px; font-size: 16px; }
  .sd-nav__cta { text-align: center; margin-top: 6px; }
}

/* ---------- Buttons ---------- */
.sd-btn { display: inline-flex; align-items: center; gap: 8px; font-family: var(--sd-font-head); font-weight: 700; font-size: 16px; padding: 13px 26px; border-radius: 999px; border: none; cursor: pointer; transition: .15s ease; line-height: 1; }
.sd-btn:hover { text-decoration: none; transform: translateY(-1px); }
.sd-btn--primary { background: var(--sd-primary); color: #fff; box-shadow: 0 6px 18px rgba(37, 99, 235, .28); }
.sd-btn--primary:hover { background: var(--sd-primary-dark); }
.sd-btn--secondary { background: var(--sd-secondary); color: #fff; box-shadow: 0 6px 18px rgba(22, 163, 74, .26); }
.sd-btn--secondary:hover { background: var(--sd-secondary-dark); }
.sd-btn--ghost { background: #fff; color: var(--sd-ink); border: 1px solid var(--sd-line-strong); }
.sd-btn--ghost:hover { background: var(--sd-line); }
.sd-btn--lg { font-size: 17px; padding: 16px 34px; }

/* ---------- Hero ---------- */
.sd-hero { padding: 56px 0 40px; }
.sd-hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; align-items: center; }
.sd-hero__badge { display: inline-flex; align-items: center; gap: 8px; font-family: var(--sd-font-round); font-size: 13px; color: var(--sd-secondary-dark); background: #E7F6ED; border: 1px solid #C7EAD4; padding: 6px 14px; border-radius: 999px; margin-bottom: 18px; }
.sd-hero h1 { font-size: 39px; margin: 0 0 16px; letter-spacing: .01em; }
.sd-hero p.lead { font-size: 18px; color: var(--sd-ink-soft); margin: 0 0 26px; }
.sd-hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }
.sd-hero__media { position: relative; }
.sd-hero__media img { border-radius: var(--sd-radius-lg); box-shadow: var(--sd-shadow); }
.sd-hero__media::after { content: ""; position: absolute; inset: auto -14px -14px auto; width: 120px; height: 120px; border-radius: 30px; background: var(--sd-accent); opacity: .35; z-index: -1; }

@media (max-width: 880px) {
  .sd-hero { padding: 32px 0 24px; }
  .sd-hero__grid { grid-template-columns: 1fr; gap: 26px; }
  .sd-hero h1 { font-size: 30px; }
}

/* ---------- Trust strip ---------- */
.sd-trust { background: var(--sd-surface); border-top: 1px solid var(--sd-line); border-bottom: 1px solid var(--sd-line); }
.sd-trust__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; padding: 26px 0; }
.sd-trust__item { display: flex; gap: 12px; align-items: flex-start; }
.sd-trust__ic { flex: none; width: 40px; height: 40px; border-radius: 12px; background: #EEF4FF; color: var(--sd-primary); display: grid; place-items: center; font-size: 20px; }
.sd-trust__item h3 { font-size: 15px; margin: 2px 0 2px; }
.sd-trust__item p { font-size: 13px; color: var(--sd-ink-soft); margin: 0; line-height: 1.6; }
@media (max-width: 760px) { .sd-trust__grid { grid-template-columns: 1fr 1fr; } }

/* ---------- Sections ---------- */
.sd-section { padding: 56px 0; }
.sd-section--tint { background: var(--sd-surface); border-top: 1px solid var(--sd-line); border-bottom: 1px solid var(--sd-line); }
.sd-section__head { max-width: 720px; margin: 0 auto 34px; text-align: center; }
.sd-section__head h2 { font-size: 28px; margin: 0 0 10px; }
.sd-section__head p { color: var(--sd-ink-soft); margin: 0; }
.sd-eyebrow { font-family: var(--sd-font-round); color: var(--sd-secondary-dark); font-size: 13px; letter-spacing: .08em; display: block; margin-bottom: 8px; }

/* ---------- Card grid ---------- */
.sd-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 920px) { .sd-cards { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .sd-cards { grid-template-columns: 1fr; } }

.sd-card { background: var(--sd-surface); border: 1px solid var(--sd-line); border-radius: var(--sd-radius); overflow: hidden; display: flex; flex-direction: column; transition: .18s ease; }
.sd-card:hover { box-shadow: var(--sd-shadow); transform: translateY(-3px); }
.sd-card__media { aspect-ratio: 1.91 / 1; background: var(--sd-line); overflow: hidden; }
.sd-card__media img { width: 100%; height: 100%; object-fit: cover; }
.sd-card__body { padding: 18px 18px 20px; display: flex; flex-direction: column; flex: 1; }
.sd-tag { align-self: flex-start; font-family: var(--sd-font-round); font-size: 12px; color: var(--sd-primary-dark); background: #EEF4FF; border-radius: 999px; padding: 3px 10px; margin-bottom: 10px; }
.sd-tag--green { color: var(--sd-secondary-dark); background: #E7F6ED; }
.sd-tag--apricot { color: #9A6212; background: #FDEED2; }
.sd-card h3 { font-size: 17px; margin: 0 0 8px; line-height: 1.5; }
.sd-card h3 a { color: var(--sd-ink); }
.sd-card p { font-size: 14px; color: var(--sd-ink-soft); margin: 0 0 14px; flex: 1; }
.sd-card__more { font-family: var(--sd-font-head); font-size: 14px; color: var(--sd-primary-dark); font-weight: 700; }

/* ---------- Newsletter ---------- */
.sd-news { background: linear-gradient(135deg, #EEF4FF, #E7F6ED); border-radius: var(--sd-radius-lg); padding: 40px; text-align: center; border: 1px solid var(--sd-line); }
.sd-news h2 { font-size: 26px; margin: 0 0 10px; }
.sd-news p { color: var(--sd-ink-soft); max-width: 560px; margin: 0 auto 22px; }
.sd-form { display: flex; gap: 10px; max-width: 480px; margin: 0 auto; flex-wrap: wrap; }
.sd-form input[type="email"], .sd-form input[type="text"], .sd-form textarea, .sd-form select {
  flex: 1; min-width: 200px; font-family: var(--sd-font-body); font-size: 16px; padding: 13px 16px;
  border: 1px solid var(--sd-line-strong); border-radius: 12px; background: #fff; color: var(--sd-ink);
}
.sd-form input:focus, .sd-form textarea:focus, .sd-form select:focus { outline: 2px solid var(--sd-primary); border-color: var(--sd-primary); }
.sd-form__note { font-size: 12px; color: var(--sd-ink-soft); margin-top: 14px; }
.sd-form__note a { text-decoration: underline; }
.sd-hp { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }

/* ---------- Article ---------- */
.sd-article { padding: 30px 0 56px; }
.sd-breadcrumb { font-size: 13px; color: var(--sd-ink-soft); margin: 0 0 18px; }
.sd-breadcrumb a { color: var(--sd-ink-soft); }
.sd-breadcrumb span { margin: 0 6px; }
.sd-article__head { max-width: var(--sd-readw); margin: 0 auto 22px; }
.sd-article__head h1 { font-size: 32px; margin: 8px 0 14px; line-height: 1.45; }
.sd-meta { font-size: 13px; color: var(--sd-ink-soft); display: flex; gap: 14px; flex-wrap: wrap; }
.sd-article__hero { max-width: var(--sd-readw); margin: 0 auto 28px; }
.sd-article__hero img { border-radius: var(--sd-radius); box-shadow: var(--sd-shadow-sm); width: 100%; }
.sd-article__hero figcaption { font-size: 12px; color: var(--sd-ink-soft); text-align: center; margin-top: 8px; }

.sd-prose { max-width: var(--sd-readw); margin: 0 auto; }
.sd-prose h2 { font-size: 24px; margin: 40px 0 14px; padding-bottom: 8px; border-bottom: 2px solid var(--sd-line); scroll-margin-top: 84px; }
.sd-prose h3 { font-size: 19px; margin: 28px 0 10px; color: var(--sd-primary-dark); scroll-margin-top: 84px; }
.sd-prose p { margin: 0 0 18px; }
.sd-prose ul, .sd-prose ol { margin: 0 0 20px; padding-left: 1.4em; }
.sd-prose li { margin-bottom: 8px; }
.sd-prose strong { color: var(--sd-ink); }
.sd-prose a { text-decoration: underline; }

.sd-lead { font-size: 18px; color: var(--sd-ink-soft); line-height: 1.95; margin-bottom: 26px !important; }

/* TOC */
.sd-toc { background: var(--sd-surface); border: 1px solid var(--sd-line); border-radius: var(--sd-radius); padding: 20px 24px; margin: 0 0 30px; }
.sd-toc h2 { font-family: var(--sd-font-head); font-size: 16px; margin: 0 0 10px; border: none; padding: 0; }
.sd-toc ol { margin: 0; padding-left: 1.3em; }
.sd-toc li { margin-bottom: 6px; font-size: 15px; }

/* callout / checklist */
.sd-note { background: #EEF4FF; border-left: 4px solid var(--sd-primary); border-radius: 10px; padding: 16px 20px; margin: 0 0 22px; font-size: 15px; }
.sd-note--green { background: #E7F6ED; border-left-color: var(--sd-secondary); }
.sd-note--apricot { background: #FDEED2; border-left-color: var(--sd-accent); }
.sd-note strong { display: block; margin-bottom: 4px; font-family: var(--sd-font-head); }

.sd-check { list-style: none; padding: 0; margin: 0 0 22px; }
.sd-check li { position: relative; padding-left: 32px; margin-bottom: 10px; }
.sd-check li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 22px; height: 22px; background: var(--sd-secondary); color: #fff; border-radius: 6px; display: grid; place-items: center; font-size: 13px; font-weight: 700; }

.sd-table-wrap { overflow-x: auto; margin: 0 0 24px; }
table.sd-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 460px; }
table.sd-table th, table.sd-table td { border: 1px solid var(--sd-line-strong); padding: 10px 12px; text-align: left; vertical-align: top; }
table.sd-table th { background: #EEF4FF; font-family: var(--sd-font-head); }
table.sd-table tr:nth-child(even) td { background: #FBFCFE; }

/* inline CTA */
.sd-cta-box { background: linear-gradient(135deg, #EEF4FF, #E7F6ED); border: 1px solid var(--sd-line); border-radius: var(--sd-radius); padding: 26px; text-align: center; margin: 36px 0; }
.sd-cta-box h3 { font-size: 19px; margin: 0 0 8px; }
.sd-cta-box p { color: var(--sd-ink-soft); margin: 0 0 16px; font-size: 15px; }

/* related */
.sd-related { max-width: var(--sd-readw); margin: 44px auto 0; }
.sd-related h2 { font-size: 20px; margin: 0 0 16px; }
.sd-related__list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { .sd-related__list { grid-template-columns: 1fr; } }
.sd-related__item { border: 1px solid var(--sd-line); border-radius: 12px; padding: 14px 16px; background: var(--sd-surface); }
.sd-related__item a { color: var(--sd-ink); font-family: var(--sd-font-head); font-size: 15px; }

.sd-source { font-size: 13px; color: var(--sd-ink-soft); border-top: 1px solid var(--sd-line); margin-top: 36px; padding-top: 18px; }
.sd-source ul { padding-left: 1.2em; margin: 8px 0 0; }

/* back to top */
.sd-totop { position: fixed; right: 20px; bottom: 20px; width: 48px; height: 48px; border-radius: 50%; background: var(--sd-primary); color: #fff; border: none; cursor: pointer; box-shadow: var(--sd-shadow); font-size: 20px; opacity: 0; pointer-events: none; transition: .2s; z-index: 40; }
.sd-totop.is-show { opacity: 1; pointer-events: auto; }
.sd-totop:hover { background: var(--sd-primary-dark); }

/* ---------- generic page ---------- */
.sd-page { padding: 36px 0 56px; }
.sd-page__head { max-width: var(--sd-readw); margin: 0 auto 26px; }
.sd-page__head h1 { font-size: 30px; margin: 10px 0 8px; }
.sd-page__head p { color: var(--sd-ink-soft); margin: 0; }
.sd-page .sd-prose h2 { font-size: 21px; }

/* definition list for legal/info */
.sd-dl { max-width: var(--sd-readw); margin: 0 auto; border: 1px solid var(--sd-line); border-radius: var(--sd-radius); overflow: hidden; }
.sd-dl div { display: grid; grid-template-columns: 200px 1fr; border-bottom: 1px solid var(--sd-line); }
.sd-dl div:last-child { border-bottom: none; }
.sd-dl dt { background: #F4F8FE; padding: 14px 18px; font-family: var(--sd-font-head); font-size: 14px; }
.sd-dl dd { padding: 14px 18px; margin: 0; font-size: 15px; }
@media (max-width: 600px) { .sd-dl div { grid-template-columns: 1fr; } .sd-dl dt { border-bottom: 1px solid var(--sd-line); } }

/* ---------- Footer ---------- */
.sd-footer { background: var(--sd-ink); color: #CBD5E1; margin-top: 40px; }
.sd-footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 30px; padding: 48px 0 32px; }
.sd-footer h4 { color: #fff; font-size: 15px; margin: 0 0 14px; }
.sd-footer a { color: #CBD5E1; font-size: 14px; }
.sd-footer a:hover { color: #fff; }
.sd-footer ul { list-style: none; padding: 0; margin: 0; }
.sd-footer li { margin-bottom: 9px; }
.sd-footer__brand .sd-logo { color: #fff; margin-bottom: 12px; }
.sd-footer__brand p { font-size: 13px; line-height: 1.8; color: #94A3B8; max-width: 320px; }
.sd-footer__legal { border-top: 1px solid #334155; padding: 18px 0 28px; font-size: 12.5px; color: #94A3B8; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.sd-footer__legal a { color: #94A3B8; }
@media (max-width: 820px) { .sd-footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .sd-footer__grid { grid-template-columns: 1fr; } }

/* ---------- Cookie banner ---------- */
.sd-cookie { position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 60; background: #fff; border: 1px solid var(--sd-line-strong); border-radius: var(--sd-radius); box-shadow: var(--sd-shadow); padding: 18px 22px; display: none; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; max-width: 920px; margin: 0 auto; }
.sd-cookie.is-show { display: flex; }
.sd-cookie p { margin: 0; font-size: 13.5px; color: var(--sd-ink-soft); flex: 1; min-width: 240px; }
.sd-cookie p a { text-decoration: underline; }
.sd-cookie__btns { display: flex; gap: 10px; flex-wrap: wrap; }
.sd-cookie .sd-btn { padding: 10px 20px; font-size: 14px; }

/* messages */
.sd-alert { border-radius: 12px; padding: 14px 18px; margin: 0 0 18px; font-size: 15px; display: none; }
.sd-alert.is-show { display: block; }
.sd-alert--ok { background: #E7F6ED; border: 1px solid #C7EAD4; color: var(--sd-secondary-dark); }
.sd-alert--err { background: #FDECEC; border: 1px solid #F5C2C2; color: #B91C1C; }

/* hero centered variant for newsletter/thankyou */
.sd-center { max-width: 620px; margin: 0 auto; text-align: center; }
.sd-center h1 { font-size: 32px; margin: 16px 0 12px; }
.sd-center p { color: var(--sd-ink-soft); }
.sd-emoji-big { font-size: 56px; line-height: 1; }

/* utilities */
.sd-mt-0 { margin-top: 0; }
.sd-center-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 24px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }