:root {
  --bg: #0f1419;
  --bg-elev: #161c23;
  --surface: #ffffff;
  --text: #1a1f26;
  --text-muted: #5a6573;
  --text-invert: #f4f6f8;
  --accent: #ff6b1a;
  --accent-hover: #e85a0c;
  --border: #e4e7eb;
  --radius: 8px;
  --max-width: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  color: var(--text);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--bg);
  color: var(--text-invert);
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-logo { height: 32px; display: block; }

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.header-nav a {
  color: var(--text-invert);
  font-size: 14px;
  font-weight: 500;
  opacity: 0.85;
}
.header-nav a:hover { opacity: 1; text-decoration: none; }

.lang-toggle {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--text-invert);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s;
}
.lang-toggle:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.5);
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elev) 100%);
  color: var(--text-invert);
  padding: 96px 0 112px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.15;
  margin: 0 0 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: clamp(16px, 1.4vw, 19px);
  color: rgba(244, 246, 248, 0.75);
  max-width: 680px;
  margin: 0 auto 40px;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 16px;
  transition: background 0.15s, transform 0.15s;
}
.cta:hover {
  background: var(--accent-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

.cta-large {
  padding: 18px 40px;
  font-size: 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.01em;
}

/* ---------- Sections ---------- */
section { padding: 88px 0; }

section h2 {
  font-size: clamp(26px, 3vw, 36px);
  margin: 0 0 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-align: center;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 17px;
  margin: 0 0 56px;
}

/* ---------- Products ---------- */
.products { background: #fafbfc; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.product-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(15, 20, 25, 0.08);
}

.product-logo {
  height: 36px;
  margin-bottom: 20px;
  display: block;
}

.product-card h3 {
  font-size: 19px;
  margin: 0 0 12px;
  font-weight: 600;
  line-height: 1.35;
}

.product-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
}

/* ---------- About ---------- */
.about { background: #fff; }
.about-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.about-inner p {
  font-size: 17px;
  color: var(--text-muted);
}

/* ---------- Contact ---------- */
.contact {
  background: var(--bg);
  color: var(--text-invert);
}
.contact h2 { color: var(--text-invert); }
.contact-inner {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.contact-inner > p {
  color: rgba(244, 246, 248, 0.7);
  font-size: 17px;
  margin: 0 0 36px;
}

/* ---------- Contact form ---------- */
.contact-form {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: rgba(244, 246, 248, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-group input,
.form-group textarea {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  color: var(--text-invert);
  font-family: var(--font);
  font-size: 15px;
  padding: 12px 14px;
  transition: border-color 0.15s, background 0.15s;
  outline: none;
  width: 100%;
  box-sizing: border-box;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(244, 246, 248, 0.3);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.09);
}

.form-group input:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
  border-color: #e05c5c;
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.form-submit {
  align-self: flex-start;
  cursor: pointer;
  border: none;
  font-family: var(--font);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-feedback {
  margin: 0;
  font-size: 15px;
  padding: 12px 16px;
  border-radius: var(--radius);
  text-align: center;
}

.form-success {
  background: rgba(34, 197, 94, 0.15);
  color: #86efac;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.form-error {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

@media (max-width: 540px) {
  .form-row { grid-template-columns: 1fr; }
  .form-submit { align-self: stretch; text-align: center; }
}

/* ---------- Footer ---------- */
.site-footer {
  background: #0a0d11;
  color: rgba(244, 246, 248, 0.6);
  padding: 40px 0;
  font-size: 14px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-logo { height: 24px; opacity: 0.7; }

.footer-text { margin: 0; }
.footer-text a { color: var(--accent); }

.footer-copy {
  margin: 0;
  font-size: 13px;
  opacity: 0.6;
}

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  .header-nav { gap: 16px; }
  .header-nav a:not(.lang-toggle) { display: none; }
  section { padding: 64px 0; }
  .hero { padding: 72px 0 80px; }
  .cta-large { font-size: 15px; padding: 16px 24px; }
}