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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #111;
  background: #fff;
  font-size: 16px;
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }

/* Nav */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 0.5px solid #E5E7EB;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px; height: 56px;
}
.nav-logo { font-weight: 500; font-size: 15px; letter-spacing: -0.3px; }
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  padding: 6px 12px; font-size: 14px; color: #6B7280;
  border-radius: 6px; transition: color 0.15s;
}
.nav-links a:hover, .nav-links a.active { color: #111; font-weight: 500; }

/* Layout */
.container { max-width: 720px; margin: 0 auto; padding: 0 24px; }
.page { padding: 72px 0 80px; }

/* Section label */
.label {
  font-size: 13px; color: #9CA3AF;
  letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 28px;
}

/* Divider */
.divider { border: none; border-top: 0.5px solid #E5E7EB; margin: 56px 0; }

/* Tags */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 12px; padding: 3px 10px; border-radius: 99px;
  background: #F3F4F6; color: #374151; font-family: monospace;
}

/* Cards */
.card {
  border: 0.5px solid #E5E7EB; border-radius: 12px;
  padding: 24px; transition: border-color 0.15s;
}
.card:hover { border-color: #9CA3AF; }

/* Footer */
footer { border-top: 0.5px solid #E5E7EB; padding: 32px 0; margin-top: 40px; }
footer .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
footer p { font-size: 13px; color: #9CA3AF; }
footer .footer-links { display: flex; gap: 20px; }
footer .footer-links a { font-size: 13px; color: #9CA3AF; }
footer .footer-links a:hover { color: #374151; }

/* Buttons */
.btn {
  display: inline-block; padding: 10px 20px;
  border-radius: 8px; font-size: 14px; cursor: pointer;
  font-weight: 500; border: none;
}
.btn-dark { background: #111; color: #fff; }
.btn-outline { background: none; border: 0.5px solid #D1D5DB; color: #374151; }
.btn-dark:hover { background: #333; }
.btn-outline:hover { border-color: #9CA3AF; }

/* Forms */
input, textarea {
  width: 100%; padding: 10px 14px;
  border: 0.5px solid #D1D5DB; border-radius: 8px;
  font-size: 14px; font-family: inherit;
  background: #fff; outline: none; color: #111;
}
input:focus, textarea:focus { border-color: #9CA3AF; }
textarea { resize: vertical; }

@media (max-width: 600px) {
  nav { padding: 0 16px; }
  .nav-links a { padding: 6px 8px; font-size: 13px; }
}