:root {
  --bg0: #0d1117;
  --bg1: #161b22;
  --bg2: #21262d;
  --bg3: #30363d;
  --border: #30363d;
  --t1: #e6edf3;
  --t2: #8b949e;
  --t3: #6e7681;
  --blue: #58a6ff;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --purple: #bc8cff;
  --orange: #f0883e;
  --cyan: #39c5cf;
  --grad: linear-gradient(135deg, #58a6ff, #bc8cff);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg0);
  color: var(--t1);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 8px 16px;
  border-radius: 6px;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 16px;
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  color: var(--t1);
  text-decoration: none;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--t1);
}

.nav-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 28px;
  transform: scale(1.25);
  transform-origin: center;
}

.nav-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.25);
  transform-origin: center;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-links a {
  color: var(--t2);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--t1);
  text-decoration: none;
}

.btn-nav {
  padding: 6px 16px;
  border-radius: 6px;
  background: var(--blue);
  color: #fff !important;
  font-weight: 500;
  font-size: 13px;
  transition: opacity 0.2s;
}

.btn-nav:hover {
  opacity: 0.9;
  text-decoration: none !important;
}

/* Section base */
.section {
  padding: 100px 24px;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 16px;
  color: var(--t2);
  max-width: 600px;
  line-height: 1.6;
}

.section-header {
  margin-bottom: 56px;
}

/* Buttons */
.btn-hero {
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-hero:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
}

.btn-primary:hover {
  background: #4a96ef;
  box-shadow: 0 0 20px rgba(88, 166, 255, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--t1);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--t2);
  background: var(--bg1);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
}

.fade-in.visible {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) var(--stagger, 0s) both;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: none;
  }
}

/* Footer */
.footer {
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-size: 12px;
  color: var(--t3);
}

.footer-links {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--t3);
  margin: 0 8px;
  font-size: 12px;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--t1);
}