:root {
  --bg: #0c0c0c;
  --fg: #ffffff;
  --fg-dim: #b8b8b8;
  --accent: #0d6efd;
  --muted: #2a2a2a;
  --radius: 12px;
  --maxw: 1200px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.nav {
  max-width: var(--maxw); margin: 0 auto; padding: 20px 16px;
  display: grid; grid-template-columns: 80px 1fr auto; gap: 16px; align-items: center;
}
.brand { font-weight: 700; letter-spacing: 2px; }
.menu a { color: var(--fg-dim); margin: 0 12px; text-decoration: none; }
.menu a:hover { color: var(--fg); }
.lang .lang-btn { background: transparent; color: var(--fg-dim); border: 1px solid var(--muted); padding: 6px 10px; border-radius: 8px; cursor: pointer; }
.lang .lang-btn:hover { color: var(--fg); border-color: var(--fg-dim); }

.hero {
  max-width: var(--maxw); margin: 40px auto; padding: 40px 16px;
}
h1 { font-size: 48px; line-height: 1.1; margin: 0 0 12px; }
.lead { font-size: 18px; color: var(--fg-dim); max-width: 680px; }
.cta {
  display: inline-block; margin-top: 20px; background: var(--accent); color: #fff;
  padding: 12px 18px; border-radius: 999px; text-decoration: none; transition: transform .1s ease;
}
.cta:hover { transform: translateY(-1px); }
.hero-meta span { color: var(--fg-dim); margin-right: 12px; }

.block { max-width: var(--maxw); margin: 60px auto; padding: 0 16px; }
.block h2, .block h3 { margin-bottom: 12px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.card { background: var(--muted); border-radius: var(--radius); padding: 20px; }

.grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.project-card {
  background: var(--muted); border-radius: var(--radius); padding: 16px;
}
.project-card img { width: 100%; border-radius: 10px; aspect-ratio: 4/3; object-fit: cover; }
.steps ol, #steps-list { padding-left: 20px; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
input, textarea {
  width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid #333; background: #111; color: #fff;
}
input:focus, textarea:focus { outline: 1px solid var(--accent); border-color: var(--accent); }

.footer {
  max-width: var(--maxw); margin: 80px auto 40px; padding: 0 16px; color: var(--fg-dim);
  display: flex; gap: 8px; align-items: center;
}
.footer .dot { opacity: .6; }

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .two-col, .contact-grid { grid-template-columns: 1fr; }
  h1 { font-size: 36px; }
}

@media (max-width: 600px) {
  .grid { grid-template-columns: 1fr; }
  .menu { display: none; }
}