/* Tsumiki Lab — site styles. Light: cool off-white; dark: navy. Brand colors from the logo. */
:root {
  --navy-top: #3d5778;
  --navy-bottom: #294165;
  --teal: #3f9a90;
  --sand: #e3c79e;
  --coral: #d9725b;

  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1f2a37;
  --muted: #5b6778;
  --border: #e3e8ef;
  --link: #2a7a71;
  --pill-bg: #fbeee9;
  --pill-text: #a64b37;
  --shadow: 0 1px 2px rgba(20, 32, 54, 0.06), 0 6px 20px rgba(20, 32, 54, 0.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #142036;
    --surface: #1c2b45;
    --text: #e8eef6;
    --muted: #a7b4c6;
    --border: #2a3b58;
    --link: #6cc5b8;
    --pill-bg: #3a2a30;
    --pill-text: #f0a08e;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 6px 20px rgba(0, 0, 0, 0.25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: 960px; margin: 0 auto; padding-inline: 24px; }

/* Navy hero band (same in light and dark) */
.hero {
  background: linear-gradient(180deg, var(--navy-top), var(--navy-bottom));
  color: #ffffff;
  padding-bottom: 72px;
}
.hero a { color: #ffffff; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.topbar nav { display: flex; gap: 20px; font-size: 15px; }
.topbar nav a { color: rgba(255, 255, 255, 0.82); }
.topbar nav a:hover { color: #ffffff; }

.hero-body {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 48px;
  padding-top: 40px;
}
.hero-body .mark { width: 170px; }
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.hero p { margin: 0; max-width: 34em; color: #d4deea; font-size: 18px; }
.hero .app-icon { width: 128px; border-radius: 28px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25); }

/* Sections */
section { padding-block: 64px 8px; }
section h2 { margin: 0 0 8px; font-size: 26px; letter-spacing: -0.01em; }
section .lead { margin: 0 0 28px; color: var(--muted); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.app-card { display: grid; grid-template-columns: 96px 1fr; gap: 24px; align-items: start; }
.app-card img { width: 96px; border-radius: 22px; }
.app-card h3 { margin: 0; font-size: 22px; }
.app-card .tagline { margin: 2px 0 12px; color: var(--muted); }
.app-card p { margin: 0 0 12px; }

.pill {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--pill-bg);
  color: var(--pill-text);
  font-size: 13px;
  font-weight: 600;
  vertical-align: middle;
}
.hero .pill { background: rgba(255, 255, 255, 0.14); color: #ffffff; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid .card { padding: 24px; }
.grid h3 { margin: 12px 0 6px; font-size: 18px; }
.grid p { margin: 0; color: var(--muted); font-size: 16px; }

/* Small colored block used as a bullet, echoing the logo */
.block { width: 22px; height: 22px; border-radius: 6px; display: block; }
.block.teal { background: var(--teal); }
.block.sand { background: var(--sand); }
.block.coral { background: var(--coral); }

.note { display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: center; }
.note .element {
  width: 84px; height: 84px; border-radius: 14px;
  background: var(--surface); border: 2px solid var(--teal);
  display: grid; place-items: center; line-height: 1;
  color: var(--text);
}
.note .element b { font-size: 34px; }
.note .element small { display: block; font-size: 12px; color: var(--muted); text-align: center; margin-bottom: 4px; }
.note p { margin: 0; }

footer {
  margin-top: 72px;
  padding-block: 28px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }

/* Narrow screens */
@media (max-width: 760px) {
  .hero-body { grid-template-columns: 1fr; gap: 28px; padding-top: 16px; text-align: center; }
  .hero-body .mark, .hero .app-icon { margin: 0 auto; }
  .hero-body .mark { width: 120px; }
  .hero p { margin-inline: auto; }
  .grid { grid-template-columns: 1fr; }
  .app-card { grid-template-columns: 1fr; }
  .topbar nav { gap: 14px; }
}