* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #0f1419;
  --color-surface: #1a2332;
  --color-text: #e6edf3;
  --color-muted: #8b949e;
  --color-accent: #58a6ff;
  --color-accent-hover: #79b8ff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 20, 25, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: block;
}

.logo {
  height: 40px;
  width: auto;
  display: block;
  border-radius: 6px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-accent);
}

.lang-switcher {
  margin-left: 0.5rem;
  padding-left: 1rem;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.lang-switcher a {
  font-size: 0.9rem;
  opacity: 0.9;
}

.lang-switcher a:hover {
  opacity: 1;
}

.lang-switcher .flag {
  display: inline-block;
  margin-right: 0.35rem;
  line-height: 1;
  vertical-align: middle;
}

/* Hero */
.hero {
  padding: 4rem 1.5rem 5rem;
  text-align: center;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.hero-content {
  max-width: 640px;
  margin: 0 auto;
}

.hero-logo {
  width: 440px;
  height: auto;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1.25rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.hero-desc {
  color: var(--color-muted);
  font-size: 1rem;
}

/* Sections */
.section {
  padding: 3rem 1.5rem;
  max-width: 720px;
  margin: 0 auto;
}

.section h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.section p {
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.section p:last-child {
  margin-bottom: 0;
}

.about {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Contact */
.contact {
  background: var(--color-surface);
  border-radius: 12px;
  margin: 2rem 1.5rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.contact-email {
  margin-top: 1rem;
}

.contact-email a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.contact-email a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* Footer */
.footer {
  padding: 2rem 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}

.footer p {
  color: var(--color-muted);
  font-size: 0.875rem;
}

.container {
  width: 100%;
}

@media (min-width: 640px) {
  .hero h1 {
    font-size: 2.75rem;
  }

  .tagline {
    font-size: 1.35rem;
  }
}