:root {
  --bg: #152a21;
  --surface: #1c3a2d;
  --text: #f0f0f0;
  --muted: #9fbfae;
  --accent: #7cc6a6;
  --maxw: 1000px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.page {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- nav ---- */
.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--surface);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; }
.brand-logo { height: 48px; display: block; }
.nav-links { display: flex; gap: 20px; margin-left: auto; }
.nav-links a { color: var(--text); }
.nav-links a.active { color: var(--accent); }
.lang-toggle { display: flex; gap: 6px; color: var(--muted); }
.lang-toggle a { color: var(--muted); }
.lang-toggle a.active { color: var(--accent); font-weight: bold; }

/* ---- content ---- */
.content { padding: 40px 0 60px; }
h1 { font-size: 1.9rem; margin: 0 0 12px; }
h2 { font-size: 1.4rem; margin: 32px 0 12px; }

/* ---- hero ---- */
.hero { text-align: center; padding: 30px 0 10px; }
.hero-logo { max-width: 280px; width: 60%; }
.hero-tagline { font-size: 1.3rem; color: var(--accent); }
.hero-intro { max-width: 620px; margin: 0 auto; }

/* ---- card grid ---- */
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 28px; }
.card {
  display: block;
  background: var(--surface);
  color: var(--text);
  padding: 22px;
  border-radius: 10px;
  border: 1px solid transparent;
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 8px; }
.badge {
  display: inline-block;
  margin-top: 10px;
  padding: 2px 10px;
  font-size: 0.8rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
}

/* ---- development detail ---- */
.dev-detail { max-width: 760px; }
.crumb { color: var(--muted); }
.tagline { font-size: 1.2rem; color: var(--accent); }
.dev-hero { max-width: 100%; border-radius: 10px; margin: 16px 0; }
.dev-intro { margin: 16px 0; }
.dev-features { padding-left: 20px; }
.cta { margin-top: 28px; }
.button {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  padding: 10px 22px;
  border-radius: 8px;
  font-weight: bold;
}
.button:hover { text-decoration: none; opacity: 0.9; }
.notfound { padding: 40px 0; }

/* ---- references ---- */
.ref-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 24px; }
.ref-card { background: var(--surface); padding: 18px; border-radius: 10px; }

/* ---- contact form ---- */
.form-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; max-width: 520px; }
.form-row label { color: var(--muted); font-size: 0.9rem; }
.form-row input, .form-row textarea {
  background: var(--bg);
  border: 1px solid var(--surface);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font: inherit;
}
.form-row textarea { min-height: 160px; resize: vertical; }
.form-error { color: #ff9b9b; font-size: 0.85rem; }
.hp { position: absolute; left: -9999px; }
.notice { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; max-width: 520px; }
.notice-ok { background: #0d2b1a; border: 1px solid #1a5c33; color: #4caf7d; }
.notice-err { background: #2b0d0d; border: 1px solid #5c1a1a; color: #e05555; }

.contact-details { font-style: normal; color: var(--muted); line-height: 1.8; }

/* ---- footer ---- */
.site-footer { border-top: 1px solid var(--surface); padding: 22px 0 40px; color: var(--muted); font-size: 0.9rem; }
.site-footer a { color: var(--muted); }

/* ---- responsive ---- */
@media (max-width: 700px) {
  .site-nav { gap: 12px; }
  .nav-links { margin-left: 0; width: 100%; flex-wrap: wrap; gap: 12px; }
  .card-grid, .ref-grid { grid-template-columns: 1fr; }
}