:root {
  --bg: #ffffff;
  --surface: #f6f7f8;
  --text: #16181b;
  --muted: #5d636b;
  --line: #e3e5e8;
  --accent: #1f5fbf;
  --max: 760px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416;
    --surface: #1b1e21;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --line: #2c3035;
    --accent: #7eb0ff;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Segoe UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand img {
  width: 28px;
  height: 28px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.9rem;
}

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

.site-nav a:hover {
  color: var(--text);
}

.lang-switch {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 12px;
}

/* Main */
main {
  padding: 48px 0 72px;
}

.hero {
  padding: 24px 0 40px;
}

.hero h1 {
  margin: 0 0 4px;
  font-size: clamp(2rem, 7vw, 2.75rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.hero .reading {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero .lead {
  margin: 0;
  font-size: 1.1rem;
}

section {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

h2 {
  margin: 0 0 16px;
  font-size: 1.3rem;
  line-height: 1.4;
}

h3 {
  margin: 28px 0 8px;
  font-size: 1.05rem;
  line-height: 1.5;
}

p {
  margin: 0 0 12px;
}

ul,
ol {
  margin: 0 0 12px;
  padding-left: 1.4em;
}

li + li {
  margin-top: 4px;
}

/* Service list */
.services {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

.services li {
  margin: 0;
  padding: 16px;
  background: var(--surface);
  border-radius: 10px;
}

.services strong {
  display: block;
  margin-bottom: 2px;
}

.services span {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (min-width: 640px) {
  .services {
    grid-template-columns: 1fr 1fr;
  }
}

/* App cards */
.apps {
  display: grid;
  gap: 16px;
}

.app-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.app-card .icon {
  flex: 0 0 64px;
  width: 64px;
  height: 64px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.app-card h3 {
  margin: 0 0 4px;
}

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

.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 400;
  vertical-align: middle;
}

/* Info table */
.info {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.info th,
.info td {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.info th {
  width: 30%;
  padding-right: 16px;
  color: var(--muted);
  font-weight: 600;
}

@media (max-width: 560px) {
  .info th,
  .info td {
    display: block;
    width: 100%;
  }

  .info th {
    padding-bottom: 0;
    border-bottom: none;
  }

  .info td {
    padding-top: 2px;
  }
}

.contact-mail {
  display: inline-block;
  margin-top: 4px;
  font-size: 1.1rem;
  font-weight: 600;
  word-break: break-all;
}

/* Legal pages */
.doc h1 {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 5vw, 2rem);
  line-height: 1.3;
}

.doc .meta {
  margin: 0 0 32px;
  color: var(--muted);
  font-size: 0.9rem;
}

.doc h2 {
  margin-top: 40px;
  font-size: 1.15rem;
}

.doc .info {
  margin-top: 8px;
}

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

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0 40px;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 12px;
}

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

.site-footer p {
  margin: 0;
}

@media (max-width: 480px) {
  .site-nav a:not(.lang-switch) {
    display: none;
  }
}