/* Keeply — one stylesheet, no external resources of any kind.
   No web fonts, no analytics, no trackers, no cookies. The page you receive is the
   whole page. */

:root {
  color-scheme: light dark;
  --bg: #fbfaf8;
  --surface: #ffffff;
  --surface-2: #f2f0ec;
  --ink: #1a1815;
  --ink-soft: #56514a;
  --ink-faint: #857e74;
  --line: #e4e0d9;
  --accent: #1f6f5c;
  --pro: #ad8117;
  --pro-soft: rgba(173, 129, 23, 0.12);
  --radius: 16px;
  --wrap: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131211;
    --surface: #1c1a18;
    --surface-2: #232120;
    --ink: #f2efea;
    --ink-soft: #b6afa5;
    --ink-faint: #8b847a;
    --line: #302d2a;
    --accent: #6fc3a8;
    --pro: #e0c65a;
    --pro-soft: rgba(224, 198, 90, 0.14);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, "Hiragino Sans", "Noto Sans JP", sans-serif;
  text-rendering: optimizeLegibility;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1.5rem; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; margin: 0 0 0.6em; }
h1 { font-size: clamp(2.1rem, 6vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); font-weight: 650; margin-top: 0; }
h3 { font-size: 1.12rem; font-weight: 620; }
p { margin: 0 0 1rem; }
.lead { font-size: clamp(1.05rem, 2.2vw, 1.28rem); color: var(--ink-soft); }
.muted { color: var(--ink-soft); }
.small { font-size: 0.92rem; }

/* Header ------------------------------------------------------------------ */

header.site {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; gap: 1rem; min-height: 60px; flex-wrap: wrap; }
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-weight: 640; color: var(--ink); text-decoration: none; font-size: 1.06rem;
}
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }
.nav-links a { color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; }
.nav-links a:hover { color: var(--ink); }

/* Language switch --------------------------------------------------------- */

.langs { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.langs a {
  display: inline-block; padding: 0.2rem 0.5rem; border-radius: 8px;
  border: 1px solid var(--line); font-size: 0.8rem; letter-spacing: 0.02em;
  color: var(--ink-soft); text-decoration: none; text-transform: uppercase;
}
.langs a[aria-current="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* Sections ---------------------------------------------------------------- */

section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
section + section { border-top: 1px solid var(--line); }

.hero { padding-top: clamp(3rem, 8vw, 6rem); }
.hero .icon { width: 84px; height: 84px; border-radius: 20px; margin-bottom: 1.5rem; display: block; }
.hero p.lead { max-width: 34rem; }

.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.35rem;
}
.card h3 { margin-bottom: 0.35rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: 0.97rem; }

/* Pro mark ---------------------------------------------------------------- */

.pro {
  display: inline-block; margin-left: 0.4em; padding: 0.05em 0.45em;
  border-radius: 6px; background: var(--pro-soft); color: var(--pro);
  font-size: 0.72em; font-weight: 640; letter-spacing: 0.03em; vertical-align: 0.12em;
  white-space: nowrap;
}

/* Plans ------------------------------------------------------------------- */

.plans { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; }
.plan.is-pro { border-color: var(--pro); }
.plan h3 { font-size: 1.28rem; }
.plan ul { list-style: none; margin: 1rem 0 0; padding: 0; }
.plan li { padding-left: 1.5rem; position: relative; margin-bottom: 0.55rem; color: var(--ink-soft); }
.plan li::before {
  content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700;
}
.plan.is-pro li::before { color: var(--pro); }
.price-note { font-size: 0.92rem; color: var(--ink-faint); margin-top: 1rem; }

/* FAQ --------------------------------------------------------------------- */

.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 1rem 0; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--ink-faint); font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq p { margin: 0.7rem 0 0; color: var(--ink-soft); }

/* Legal ------------------------------------------------------------------- */

.legal { max-width: 44rem; }
.legal h2 { margin-top: 2.4rem; font-size: 1.28rem; }
.legal h2:first-of-type { margin-top: 0; }
.legal ul { padding-left: 1.2rem; color: var(--ink-soft); }
.legal li { margin-bottom: 0.4rem; }
.legal .updated { color: var(--ink-faint); font-size: 0.9rem; }
.callout {
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.1rem 1.3rem; margin: 1.5rem 0;
}
.callout p:last-child { margin-bottom: 0; }

/* Footer ------------------------------------------------------------------ */

footer.site { border-top: 1px solid var(--line); padding: 2.5rem 0 3.5rem; color: var(--ink-soft); }
footer.site nav { display: flex; flex-wrap: wrap; gap: 1.1rem; margin-bottom: 1rem; }
footer.site a { color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; }
footer.site a:hover { color: var(--ink); text-decoration: underline; }
footer .colophon { font-size: 0.88rem; color: var(--ink-faint); }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}