:root {
  --bg: #fdfdfd;
  --bg-alt: #f4f5f7;
  --fg: #1b1f24;
  --fg-muted: #5b6471;
  --line: #e4e7eb;
  --accent: #2a8af6;
  --accent-fg: #ffffff;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 2px rgba(15, 22, 36, .04), 0 8px 24px rgba(15, 22, 36, .04);
  --radius: 14px;
}
[data-bs-theme="dark"] {
  --bg: #0f1216;
  --bg-alt: #161a20;
  --fg: #e9ecf1;
  --fg-muted: #8c95a4;
  --line: #232830;
  --accent: #5fa8ff;
  --accent-fg: #06101e;
  --card-bg: #181c22;
  --card-shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 720px; }

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

h1, h2, h3 { letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); line-height: 1.1; margin: 0 0 1rem; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin: 0 0 1rem; }
h3 { font-size: 1.1rem; margin: 0 0 .5rem; }
p { margin: 0 0 1rem; }
code { background: var(--bg-alt); padding: 2px 6px; border-radius: 4px; font-size: .92em; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 1.3rem; }
.brand-text em { font-style: normal; color: var(--fg-muted); font-weight: 500; }
.topnav { display: flex; gap: 18px; margin-left: 12px; flex: 1; }
.topnav a { color: var(--fg-muted); font-size: .94rem; }
.topnav a:hover { color: var(--fg); text-decoration: none; }
.topright { display: flex; gap: 12px; align-items: center; }
.theme-toggle {
  background: none; border: 1px solid var(--line);
  color: var(--fg); width: 32px; height: 32px;
  border-radius: 8px; cursor: pointer; font-size: 1rem;
}
.theme-toggle:hover { background: var(--bg-alt); }
.lang-select {
  background: var(--bg); color: var(--fg);
  border: 1px solid var(--line); padding: 4px 8px; border-radius: 8px;
  font: inherit; font-size: .85rem; font-weight: 600;
  cursor: pointer;
}
.lang-select:hover { background: var(--bg-alt); }
.lang-select:focus { outline: none; border-color: var(--accent); }

@media (max-width: 760px) {
  .topnav { display: none; }
}

/* Hero */
.hero { padding: 80px 0 60px; }
.hero h1 { font-weight: 800; }
.hero .accent { color: var(--accent); }
.lead { font-size: 1.2rem; color: var(--fg-muted); max-width: 720px; }
.cta { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.hero-meta {
  margin-top: 32px; color: var(--fg-muted); font-size: .9rem;
  display: flex; gap: 10px; flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px;
  font-weight: 600; font-size: .95rem; cursor: pointer;
  border: 1px solid transparent; transition: transform .05s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { text-decoration: none; opacity: .92; }
.btn-ghost { border-color: var(--line); color: var(--fg); background: transparent; }
.btn-ghost:hover { background: var(--bg-alt); text-decoration: none; }

/* Sections */
.section { padding: 72px 0; border-top: 1px solid var(--line); }
.section-alt { background: var(--bg-alt); }
.section-lead { color: var(--fg-muted); max-width: 720px; margin-bottom: 2rem; }
.section-cta { margin-top: 2rem; }

/* Cards */
.cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px; margin-top: 28px;
}
.cards-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card {
  background: var(--card-bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
  box-shadow: var(--card-shadow);
}
.card-icon { font-size: 1.6rem; margin-bottom: 8px; }
.card p { color: var(--fg-muted); margin: 0; font-size: .95rem; }

/* Hardware */
.hw-grid {
  display: grid; gap: 18px; margin-top: 28px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.hw {
  background: var(--card-bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
}
.hw ul { padding-left: 1.2rem; margin: .5rem 0 0; color: var(--fg-muted); }
.hw li { margin-bottom: 4px; }
.muted { color: var(--fg-muted); }
.small { font-size: .9rem; }

/* Contact form */
.contact-form { margin-top: 24px; display: flex; flex-direction: column; gap: 14px; }
.contact-form label { display: flex; flex-direction: column; gap: 6px; font-size: .92rem; color: var(--fg-muted); }
.contact-form input,
.contact-form textarea {
  font: inherit;
  background: var(--card-bg);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
.honeypot { position: absolute; left: -9999px; height: 0; width: 0; opacity: 0; }
.form-status { min-height: 1.2em; font-size: .9rem; margin: 0; }
.form-status.ok { color: #1f9d55; }
.form-status.err { color: #c0392b; }
[data-bs-theme="dark"] .form-status.ok { color: #4ade80; }
[data-bs-theme="dark"] .form-status.err { color: #ff7676; }

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid; gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: 32px;
}
.footer ul { list-style: none; padding: 0; margin: 8px 0 0; }
.footer ul li { margin-bottom: 4px; }
.footer strong { font-size: .9rem; }
.footer-bottom { padding-top: 16px; border-top: 1px solid var(--line); }