/* oshitecho developer pages — lean product intro + support */
:root {
  --bg: #f7f3ec;
  --bg-elevated: #fffdf8;
  --ink: #2a241c;
  --muted: #6b6258;
  --line: #e4dccd;
  --accent: #9b3d30;
  --accent-soft: #f0ddd9;
  --font-body: "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-display: "DM Sans", "Noto Sans JP", "Hiragino Sans", sans-serif;
  --max: 720px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #f0e4d4 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #efe6dc 0%, transparent 50%),
    var(--bg);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  opacity: 0.85;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  background: #fff;
  padding: 0.5rem 0.75rem;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 243, 236, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: inherit;
  text-decoration: none;
  font-weight: 600;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.brand-name {
  font-family: var(--font-display);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
  font-size: 0.92rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.hero {
  max-width: var(--max);
  padding: 1.5rem 0 2.5rem;
}

.hero-kicker {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.hero-lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.button:hover {
  opacity: 0.92;
}

.button-secondary {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.button-ghost {
  background: var(--accent-soft);
  color: var(--accent);
}

.section {
  max-width: var(--max);
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
}

.section p,
.section li {
  color: var(--muted);
}

.section ul {
  margin: 0;
  padding-left: 1.2rem;
}

.section li + li {
  margin-top: 0.35rem;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.35rem 1.4rem;
}

.email-box {
  margin-top: 1.25rem;
}

.email-box a {
  font-size: 1.2rem;
  font-weight: 700;
  word-break: break-all;
}

.meta-note {
  margin-top: 0.85rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 1.25rem 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.1rem;
}

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

.footer-links a:hover {
  color: var(--ink);
}

@media (max-width: 640px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
}