/* === Base === */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-bg);
}

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-3) var(--space-4);
  z-index: calc(var(--z-header) + 1);
  border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; }

/* === Container === */
.container { max-width: var(--width-content); margin: 0 auto; padding: 0 var(--space-5); }
.reading { max-width: var(--width-reading); margin: 0 auto; padding: 0 var(--space-5); }

/* === Typography === */
h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.2; letter-spacing: -0.02em; font-weight: 800; }
h2 { font-size: clamp(26px, 3.5vw, 36px); line-height: 1.25; letter-spacing: -0.01em; font-weight: 800; }
h3 { font-size: 22px; line-height: 1.35; font-weight: 700; }
h4 { font-size: 18px; line-height: 1.4; font-weight: 700; }
p { margin: 0; }
.lead { font-size: 18px; color: var(--color-text-muted); }
.muted { color: var(--color-text-muted); }
.subtle { color: var(--color-text-subtle); font-size: 14px; }

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

code, pre {
  font-family: var(--font-family-mono);
  font-size: 14px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
}
code { padding: 2px 6px; }
pre { padding: var(--space-4); overflow-x: auto; border: 1px solid var(--color-border); }
pre code { background: transparent; padding: 0; }

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-5);
}
.site-header__brand { display: flex; align-items: center; gap: var(--space-2); }
.site-header__brand:hover { text-decoration: none; }
.site-header__brand .logo-icon { height: 28px; width: auto; }
.site-header__brand .logo-text { height: 20px; width: auto; }
.site-nav { display: flex; align-items: center; gap: var(--space-5); }
.site-nav__link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 15px;
  padding: var(--space-2) 0;
}
.site-nav__link:hover { color: var(--color-primary); text-decoration: none; }

.site-nav__menu-trigger {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text);
  font-weight: 500;
  font-size: 15px;
  padding: var(--space-2) 0;
}
.site-nav__menu-trigger::after {
  content: "";
  width: 0;
  height: 0;
  margin-left: 4px;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform var(--transition-fast);
}
.site-nav__menu-trigger[aria-expanded="true"]::after { transform: rotate(180deg); }

.site-nav__menu-wrap { position: relative; }
.site-nav__menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-3);
  min-width: 280px;
  display: none;
}
.site-nav__menu[data-open="true"] { display: grid; gap: 2px; }
.site-nav__menu a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 14px;
}
.site-nav__menu a:hover { background: var(--color-bg-alt); color: var(--color-primary); text-decoration: none; }

.site-cta { display: flex; align-items: center; gap: var(--space-3); }

.site-nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
}
.site-nav__toggle span,
.site-nav__toggle span::before,
.site-nav__toggle span::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: transform var(--transition-fast);
}
.site-nav__toggle span::before { position: absolute; top: -7px; left: 0; }
.site-nav__toggle span::after { position: absolute; top: 7px; left: 0; }
.site-nav__toggle[aria-expanded="true"] span { background: transparent; }
.site-nav__toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.site-nav__toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .site-nav { display: none; }
  .site-cta .site-cta__login { display: none; }
  .site-nav__toggle { display: inline-flex; }
  .site-nav[data-open="true"] {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: var(--space-5);
    gap: var(--space-4);
    align-items: flex-start;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }
  .site-nav[data-open="true"] .site-nav__menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: 0;
    padding: 0 0 0 var(--space-3);
    min-width: 0;
  }
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn--secondary { background: #fff; color: var(--color-primary); border: 1.5px solid var(--color-border-strong); }
.btn--secondary:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-bg-alt); }
.btn--ghost { color: var(--color-primary); padding: 10px 12px; }
.btn--ghost:hover { background: var(--color-bg-alt); }
.btn--lg { padding: 14px 28px; font-size: 16px; border-radius: var(--radius-lg); }

/* === Hero === */
.hero {
  padding: var(--space-9) 0 var(--space-8);
  background:
    radial-gradient(60rem 40rem at 80% -20%, rgba(63,124,208,.18), transparent 60%),
    radial-gradient(40rem 30rem at 0% 110%, rgba(27,58,110,.10), transparent 60%);
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-7);
  align-items: center;
}
.hero__title { margin-bottom: var(--space-4); }
.hero__title .accent { background: var(--color-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__sub { font-size: 18px; color: var(--color-text-muted); margin-bottom: var(--space-6); max-width: 540px; }
.hero__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero__note { margin-top: var(--space-4); font-size: 14px; color: var(--color-text-subtle); }
@media (max-width: 900px) { .hero__inner { grid-template-columns: 1fr; gap: var(--space-6); } }

/* === Mock app screenshot (hero visual) === */
.mock {
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
}
.mock__topbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.mock__dot { width: 11px; height: 11px; border-radius: 50%; background: #ddd; }
.mock__dot--r { background: #ff6058; }
.mock__dot--y { background: #ffbe2f; }
.mock__dot--g { background: #29c83f; }
.mock__addr { margin-left: var(--space-4); font-size: 12px; color: var(--color-text-subtle); font-family: var(--font-family-mono); }
.mock__body { display: grid; grid-template-columns: 200px 1fr; min-height: 360px; }
.mock__sidebar { background: #0F1F3A; color: #B8C2D9; padding: var(--space-4); display: grid; gap: 4px; align-content: start; }
.mock__sidebar-title { color: #fff; font-weight: 700; font-size: 14px; margin-bottom: var(--space-3); }
.mock__nav-item { padding: 8px 10px; border-radius: var(--radius-sm); font-size: 13px; }
.mock__nav-item.is-active { background: rgba(255,255,255,0.10); color: #fff; }
.mock__main { background: #fff; }
.mock__main-header { padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border); display: flex; gap: var(--space-3); align-items: center; font-size: 13px; color: var(--color-text-muted); }
.mock__list { display: grid; }
.mock__row { display: grid; grid-template-columns: 24px 160px 1fr auto; gap: var(--space-3); padding: 12px var(--space-4); border-bottom: 1px solid var(--color-border); font-size: 13px; align-items: center; }
.mock__row:last-child { border-bottom: 0; }
.mock__row.unread { background: #F4F8FE; }
.mock__avatar { width: 24px; height: 24px; border-radius: 50%; background: var(--color-gradient); color: #fff; display: grid; place-items: center; font-size: 11px; font-weight: 700; }
.mock__row .from { color: var(--color-text); font-weight: 600; }
.mock__row.unread .from { color: var(--color-primary); }
.mock__row .subject { color: var(--color-text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock__row .time { color: var(--color-text-subtle); font-size: 12px; }
.mock__row .badge {
  display: inline-block; padding: 2px 8px; border-radius: var(--radius-pill);
  font-size: 11px; font-weight: 600;
}
.badge--open { background: var(--color-success-bg); color: var(--color-success); }
.badge--closed { background: var(--color-bg-soft); color: var(--color-text-muted); }
.badge--archive { background: var(--color-warning-bg); color: var(--color-warning); }

/* === Sections === */
.section { padding: var(--space-9) 0; }
.section--alt { background: var(--color-bg-alt); }
.section__head { text-align: center; margin-bottom: var(--space-7); }
.section__eyebrow { color: var(--color-accent); font-weight: 700; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; }
.section__title { margin-top: var(--space-2); }
.section__sub { margin-top: var(--space-3); color: var(--color-text-muted); font-size: 17px; max-width: 640px; margin-left: auto; margin-right: auto; }

/* === Feature grid === */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
@media (max-width: 900px) { .feature-grid { grid-template-columns: 1fr; } }
.feature-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  display: grid;
  gap: var(--space-3);
}
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--color-border-strong); text-decoration: none; }
.feature-card__icon {
  width: 44px; height: 44px; border-radius: var(--radius-md);
  background: var(--color-bg-soft); color: var(--color-primary);
  display: grid; place-items: center;
}
.feature-card__icon svg { width: 24px; height: 24px; }
.feature-card__title { color: var(--color-text); }
.feature-card__desc { color: var(--color-text-muted); font-size: 15px; }
.feature-card__more { color: var(--color-accent); font-weight: 600; font-size: 14px; }

/* === Pricing === */
.plan-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  align-items: stretch;
}
.plan-grid[hidden] { display: none; }
@media (max-width: 1080px) { .plan-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .plan-grid { grid-template-columns: 1fr; } }
.plan-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.plan-card.is-featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  position: relative;
}
.plan-card.is-featured::before {
  content: "おすすめ";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}
.plan-card__name { font-size: 18px; font-weight: 700; }
.plan-card__desc { color: var(--color-text-muted); font-size: 14px; min-height: 40px; }
.plan-card__price { display: flex; align-items: baseline; gap: 4px; }
.plan-card__price .amount { font-size: 36px; font-weight: 800; letter-spacing: -0.02em; }
.plan-card__price .unit { color: var(--color-text-muted); font-size: 14px; }
.plan-card__price-yearly { color: var(--color-text-subtle); font-size: 13px; }
.plan-card ul { display: grid; gap: 8px; font-size: 14px; }
.plan-card ul li { display: flex; gap: 8px; align-items: flex-start; }
.plan-card ul li::before { content: "✓"; color: var(--color-success); font-weight: 700; }
.plan-card .btn { margin-top: auto; }

/* Billing cycle toggle */
.billing-toggle {
  display: inline-flex;
  background: var(--color-bg-soft);
  border-radius: var(--radius-pill);
  padding: 4px;
  gap: 2px;
  margin: 0 auto var(--space-6);
}
.billing-toggle button {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
}
.billing-toggle button[aria-pressed="true"] { background: #fff; color: var(--color-primary); box-shadow: var(--shadow-sm); }
.billing-toggle__discount { font-size: 12px; color: var(--color-success); margin-left: 4px; }

/* Addons */
.addon-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
@media (max-width: 900px) { .addon-list { grid-template-columns: 1fr; } }
.addon-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: grid;
  gap: var(--space-2);
}
.addon-item__name { font-weight: 700; }
.addon-item__price { font-size: 22px; font-weight: 800; }

/* === FAQ === */
.faq-list { display: grid; gap: var(--space-3); max-width: 760px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "＋";
  font-size: 20px;
  color: var(--color-text-subtle);
  font-weight: 400;
  transition: transform var(--transition-fast);
}
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin-top: var(--space-3); color: var(--color-text-muted); }

/* === CTA banner === */
.cta-banner {
  background: var(--color-gradient);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  text-align: center;
  color: #fff;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { margin-top: var(--space-3); color: rgba(255,255,255,0.88); }
.cta-banner .btn { margin-top: var(--space-5); background: #fff; color: var(--color-primary); }
.cta-banner .btn:hover { background: rgba(255,255,255,0.92); }

/* === Footer === */
.site-footer { background: #0F1F3A; color: #B8C2D9; padding: var(--space-8) 0 var(--space-6); }
.site-footer__inner { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: var(--space-6); }
@media (max-width: 900px) { .site-footer__inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .site-footer__inner { grid-template-columns: 1fr; } }
.site-footer__brand .brand-mark { display: inline-flex; align-items: center; gap: var(--space-2); }
.site-footer__brand .logo-icon { height: 28px; width: auto; }
.site-footer__brand .logo-text { height: 20px; width: auto; filter: brightness(0) invert(1); }
.site-footer__brand p { font-size: 13px; color: #8A95A8; margin-top: var(--space-3); }
.site-footer__col h4 { color: #fff; font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: var(--space-3); }
.site-footer__col a { color: #B8C2D9; font-size: 14px; }
.site-footer__col a:hover { color: #fff; }
.site-footer__col li { margin-bottom: var(--space-2); }
.site-footer__bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: var(--space-6); padding-top: var(--space-5); display: flex; justify-content: space-between; font-size: 13px; color: #5B6B85; }
@media (max-width: 600px) { .site-footer__bottom { flex-direction: column; gap: var(--space-2); } }

/* === Doc layout (features/manual) === */
.doc-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-7);
  padding: var(--space-7) 0;
  align-items: start;
}
@media (max-width: 900px) { .doc-layout { grid-template-columns: 1fr; gap: var(--space-5); } }
.doc-side {
  position: sticky;
  top: 80px;
  align-self: start;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: var(--color-bg-alt);
}
@media (max-width: 900px) { .doc-side { position: static; } }
.doc-side h3 { font-size: 14px; color: var(--color-text-subtle); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: var(--space-3); }
.doc-side ul { display: grid; gap: 2px; }
.doc-side a { display: block; padding: 8px 12px; border-radius: var(--radius-sm); font-size: 14px; color: var(--color-text); }
.doc-side a:hover { background: #fff; color: var(--color-primary); text-decoration: none; }
.doc-side a[aria-current="page"] { background: #fff; color: var(--color-primary); font-weight: 600; box-shadow: var(--shadow-sm); }

.doc-content { max-width: var(--width-reading); }
.doc-content h1 { margin-bottom: var(--space-4); }
.doc-content h2 { margin: var(--space-7) 0 var(--space-4); padding-top: var(--space-3); border-top: 1px solid var(--color-border); }
.doc-content h2:first-of-type { border-top: 0; padding-top: 0; margin-top: var(--space-6); }
.doc-content h3 { margin: var(--space-5) 0 var(--space-3); }
.doc-content p { margin-top: var(--space-3); }
.doc-content ul, .doc-content ol { margin-top: var(--space-3); padding-left: var(--space-5); }
.doc-content ul { list-style: disc; }
.doc-content ol { list-style: decimal; }
.doc-content li { margin-bottom: 6px; }
.doc-content table { margin: var(--space-4) 0; width: 100%; font-size: 14px; border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; }
.doc-content th, .doc-content td { padding: 10px 14px; border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: top; }
.doc-content th { background: var(--color-bg-alt); font-weight: 700; }
.doc-content tr:last-child td { border-bottom: 0; }
.doc-content blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-4) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.doc-meta { display: flex; gap: var(--space-3); align-items: center; font-size: 13px; color: var(--color-text-subtle); margin-bottom: var(--space-5); }
.doc-meta .pill { display: inline-block; background: var(--color-bg-soft); color: var(--color-primary); padding: 3px 10px; border-radius: var(--radius-pill); font-weight: 600; }

/* === Notes / Callouts === */
.callout {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  padding: var(--space-4) var(--space-5);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-4) 0;
}
.callout--warn { border-left-color: var(--color-warning); background: var(--color-warning-bg); }
.callout--danger { border-left-color: var(--color-danger); background: var(--color-danger-bg); }
.callout strong { display: block; margin-bottom: 4px; }

/* === Steps (manual) === */
.steps { display: grid; gap: var(--space-4); margin: var(--space-5) 0; counter-reset: step; }
.step {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5) var(--space-4) calc(var(--space-7) + 8px);
  position: relative;
  counter-increment: step;
}
.step::before {
  content: counter(step);
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 14px;
}
.step h3 { margin: 0 0 var(--space-2); font-size: 16px; }
.step p { color: var(--color-text-muted); font-size: 14px; }

/* Utility */
.text-center { text-align: center; }
.gradient-text { background: var(--color-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hidden-print { } /* placeholder */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }