/* ── Variables ── */
:root {
  --bg:           #070e17;
  --surface:      #0c1520;
  --surface-2:    #111e2d;
  --border:       #1a2d42;
  --accent:       #f97316;
  --accent-dim:   rgba(249,115,22,0.12);
  --accent-glow:  rgba(249,115,22,0.35);
  --text:         #edf2f7;
  --text-muted:   #7a8a9e;
  --text-dim:     #3d4f63;
  --nav-h:        64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "DM Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ── Nav shared ── */
.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  margin-right: 40px;
  flex-shrink: 0;
}
.nav-logo-img {
  height: 40px;
  width: auto;
  display: block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}
.nav-links a {
  padding: 7px 13px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--text); }
.nav-links .conduct { color: var(--text-dim); font-size: 13px; }
.nav-cfp {
  margin-left: auto;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
  padding: 7px 18px !important;
  border-radius: 6px !important;
  font-weight: 600 !important;
  font-size: 14px !important;
  transition: border-color 0.2s, background 0.2s !important;
  flex-shrink: 0;
}
.nav-cfp:hover {
  border-color: rgba(249,115,22,0.4) !important;
  background: var(--accent-dim) !important;
}
.nav-register {
  margin-left: 10px;
  background: var(--accent) !important;
  color: #fff !important;
  padding: 8px 22px !important;
  border-radius: 6px !important;
  font-weight: 600 !important;
  font-size: 14px !important;
  transition: transform 0.15s, box-shadow 0.15s !important;
  flex-shrink: 0;
}
.nav-register:hover {
  transform: translateY(-1px) !important;
  box-shadow: 0 6px 24px var(--accent-glow) !important;
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: rgba(7, 9, 15, 0.96);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  padding: 12px 0 20px;
  z-index: 199;
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu a {
  padding: 12px 32px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-mobile-menu a:hover { color: var(--text); }
.nav-mobile-menu .mobile-cfp {
  margin: 8px 32px 0;
  border: 1px solid var(--border);
  padding: 10px 24px;
  border-radius: 6px;
  text-align: center;
}
.nav-mobile-menu .mobile-register {
  margin: 8px 32px 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: 6px;
  text-align: center;
}

/* ── Footer ── */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-brand {
  font-family: "DM Sans", sans-serif;
  font-weight: 800;
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: -0.3px;
}
.footer-brand span { color: var(--accent); }
.footer-links {
  display: flex;
  gap: 20px;
  align-items: center;
}
.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text-muted); }

/* ── Responsive ── */
@media (max-width: 680px) {
  #main-nav { padding: 0 20px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-logo { margin-right: 0; }
  footer { flex-direction: column; align-items: flex-start; }
}