/* タチイチ — shared styles. Zero dependencies.
   Stage lighting at night: deep indigo into magenta, with soft white
   marker-dots standing in for dancers finding their positions. */
:root {
  --bg: #f8f6fb;
  --fg: #241b34;
  --fg-muted: #6b6178;
  --accent: #9c1fb0;
  --accent-fg: #ffffff;
  --card: #ffffff;
  --border: #e7e0f2;
  --code-bg: #f1e9fa;
  color-scheme: light dark;

  /* Brand palette (hero): deep indigo ground rising into a magenta stage glow. */
  --brand-deep: #1e1042;
  --brand: #551a7a;
  --brand-bright: #ff3fb0;
  --brand-on: #fdf2ff;
  --brand-on-muted: #dcb8ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #120c1e;
    --fg: #ede6f5;
    --fg-muted: #ad9fc4;
    --accent: #ef6fe0;
    --accent-fg: #120c1e;
    --card: #1b1330;
    --border: #362a54;
    --code-bg: #251a3f;

    --brand-deep: #0f0a22;
    --brand: #3a1256;
    --brand-bright: #ff3fb0;
    --brand-on: #fdf2ff;
    --brand-on-muted: #cf9fe0;
  }
}

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

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

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% 150% at 82% 10%, rgba(255, 63, 176, 0.32), transparent 55%),
    linear-gradient(160deg, var(--brand-deep), var(--brand) 82%);
  color: var(--brand-on);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset;
}

.hero .hero-icon {
  width: 84px;
  height: 84px;
  margin: 0 auto;
  filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.35));
}

.hero h1 {
  font-size: 2rem;
  line-height: 1.35;
  margin: 1.2rem 0 0.7rem;
  color: var(--brand-on);
}

.hero .tagline {
  font-size: 1.08rem;
  color: var(--brand-on);
  opacity: 0.94;
  max-width: 33rem;
  margin: 0 auto;
}

.hero .fine-print {
  margin-top: 1.4rem;
  font-size: 0.85rem;
  color: var(--brand-on-muted);
}

.store-button {
  display: inline-block;
  margin-top: 1.6rem;
  padding: 0.75rem 1.6rem;
  border-radius: 12px;
  background: var(--brand-bright);
  color: #260018;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
}

.store-button:hover {
  filter: brightness(1.05);
}

/* Pre-launch state: the App Store URL does not exist until the app is approved,
   so the hero shows a non-clickable status instead of a dead link. */
.store-button--pending {
  cursor: default;
  opacity: 0.9;
}

/* 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);
}

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

.card-link {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.3rem 1.3rem 1.4rem;
  text-decoration: none;
  color: inherit;
}

.card-link:hover {
  border-color: var(--accent);
}

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

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

/* Feature chips on the landing page */
.features {
  display: grid;
  gap: 0.8rem;
  margin: 1.8rem 0 0;
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.2rem;
}

.feature h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  color: var(--accent);
}

.feature p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 0.93rem;
}

/* 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;
}

.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;
}

/* Prominent constraint / scope notice */
.notice-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand-bright);
  border-radius: 14px;
  padding: 1.1rem 1.3rem;
  margin: 1.5rem 0 0;
}

.notice-box h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: var(--accent);
}

.notice-box p {
  margin: 0.3rem 0 0;
  color: var(--fg-muted);
  font-size: 0.92rem;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}