/* Dencho — shared styles. Zero dependencies. */
:root {
  --bg: #faf9f6;
  --fg: #1a1c1a;
  --fg-muted: #6a6f6a;
  --accent: #17795f;
  --accent-fg: #ffffff;
  --card: #ffffff;
  --border: #e5e7e2;
  --code-bg: #eef2ee;
  color-scheme: light dark;

  /* Brand palette (marketing page: index.html).
     A ledger-green ink on warm paper — the color of an accountant's
     column-ruled book and a calculator tape, not a flashy utility. */
  --brand-deep: #0c3b30;
  --brand: #17795f;
  --brand-bright: #3fae8c;
  --brand-on: #f2faf6;
  --brand-on-muted: #bfe0d3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121412;
    --fg: #f0f2ee;
    --fg-muted: #9aa09a;
    --accent: #4fc3a1;
    --accent-fg: #06231b;
    --card: #1a1d1a;
    --border: #2a2e2a;
    --code-bg: #1e221e;

    --brand-deep: #06231b;
    --brand: #12523f;
    --brand-bright: #4fc3a1;
    --brand-on: #f2faf6;
    --brand-on-muted: #a7cebe;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.7;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

header.site {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 0;
}

header.site a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

header.site a:hover {
  color: var(--accent);
}

h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 1.2rem 0 0.4rem;
}

h2 {
  font-size: 1.35rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 2.2rem 0 0.6rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}

h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

h3 {
  font-size: 1.1rem;
  margin: 1.6rem 0 0.4rem;
}

p, ul, ol {
  margin: 0.6rem 0;
}

ul, ol {
  padding-left: 1.4rem;
}

li {
  margin: 0.3rem 0;
}

a {
  color: var(--accent);
}

strong {
  font-weight: 600;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  background: var(--code-bg);
  border-radius: 5px;
  padding: 0.1rem 0.35rem;
  font-size: 0.9em;
}

.meta {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.lang-note {
  color: var(--fg-muted);
  font-size: 0.9rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.7rem 1rem;
  margin: 1.2rem 0;
}

.lang-note a {
  color: var(--accent);
}

section.lang {
  margin-top: 1rem;
}

section.lang + section.lang {
  margin-top: 3rem;
  border-top: 2px solid var(--border);
  padding-top: 1rem;
}

footer.site {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 0.9rem;
}

footer.site nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  margin-bottom: 0.8rem;
}

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

footer.site a:hover {
  color: var(--accent);
}

.legal-notice {
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--fg-muted);
}

/* Landing page hero */
.hero {
  text-align: center;
  margin: 1.5rem 0 2.5rem;
  padding: 3rem 1.5rem 2.8rem;
  border-radius: 28px;
  background:
    radial-gradient(120% 140% at 18% 12%, rgba(63, 174, 140, 0.28), transparent 55%),
    linear-gradient(160deg, var(--brand-deep), var(--brand) 70%);
  color: var(--brand-on);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset;
}

.hero .hero-icon {
  width: 76px;
  height: 76px;
  margin: 0 auto;
  filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.35));
}

.hero h1 {
  font-size: 2.2rem;
  line-height: 1.25;
  margin: 1.2rem 0 0.7rem;
  color: var(--brand-on);
}

.hero .tagline {
  font-size: 1.15rem;
  color: var(--brand-on);
  opacity: 0.92;
  max-width: 32rem;
  margin: 0 auto;
}

.hero .tagline-en {
  font-size: 1rem;
  color: var(--brand-on-muted);
  max-width: 30rem;
  margin: 0.5rem auto 0;
}

.hero .store-button {
  margin-top: 1.9rem;
}

.hero .fine-print {
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: var(--brand-on-muted);
}

.store-button {
  display: inline-block;
  padding: 0.85rem 1.7rem;
  background: var(--brand-on);
  color: var(--brand-deep);
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
}

.store-button:hover {
  opacity: 0.85;
}

/* eyebrow label above a section heading */
.eyebrow {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.features {
  display: grid;
  gap: 1.1rem;
  margin-top: 1.5rem;
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.3rem 1.3rem 1.5rem;
  overflow: hidden;
}

.feature .feature-icon {
  display: block;
  width: 36px;
  height: 36px;
  margin: 0 0 0.8rem;
  color: var(--accent);
}

.feature h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  color: var(--accent);
}

.feature p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

/* Worked-example tape strip on the landing page */
.tape-demo {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.2rem 1.3rem;
  margin: 1.6rem 0 0;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.95rem;
}

.tape-demo .tape-row {
  display: flex;
  justify-content: space-between;
  padding: 0.28rem 0;
  border-bottom: 1px dashed var(--border);
  color: var(--fg-muted);
}

.tape-demo .tape-row:last-of-type {
  border-bottom: none;
}

.tape-demo .tape-row.total {
  border-top: 2px solid var(--accent);
  border-bottom: none;
  margin-top: 0.3rem;
  padding-top: 0.5rem;
  color: var(--fg);
  font-weight: 700;
}

.tape-demo .tape-op {
  color: var(--accent);
}

.tape-caption {
  margin: 0.7rem 0 0;
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", sans-serif;
}

/* FAQ */
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem 1.3rem;
  margin: 1rem 0;
}

.faq-item h3 {
  margin: 0 0 0.5rem;
}

.faq-item p, .faq-item ul, .faq-item ol {
  font-size: 0.97rem;
}

.contact-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem 1.3rem;
  margin: 2rem 0 0;
  text-align: center;
}

/* Bottom-of-page call to action band */
.cta-band {
  text-align: center;
  margin: 2.6rem 0 1rem;
  padding: 2.2rem 1.5rem;
  border-radius: 24px;
  background: var(--card);
  border: 1px solid var(--border);
}

.cta-band h2 {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.cta-band p {
  color: var(--fg-muted);
  max-width: 30rem;
  margin: 0.4rem auto 1.4rem;
}

.disclaimer-box {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem 1.3rem;
  margin: 1rem 0;
  font-size: 0.95rem;
}

@media (min-width: 640px) {
  .features {
    grid-template-columns: repeat(3, 1fr);
  }
}