/* ═══════════════════════════════════════════════════════════
   HEADER + MAIN + FOOTER LAYOUT
═══════════════════════════════════════════════════════════ */

body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  border-bottom: 1px solid var(--line-soft);
  background: var(--topbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 14px 28px;
  margin: 0 auto;
  max-width: 1200px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--text);
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.brand em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

.brand img {
  height: 28px;
  vertical-align: middle;
}

.nav-tabs {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  color: var(--text-dim);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  transition:
    color var(--transition-colors),
    border-color var(--transition-colors);
}

.nav-link:hover {
  color: var(--text);
  border-bottom-color: var(--accent-light);
}

.nav-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  flex-shrink: 0;
}

#auth-status {
  display: flex;
  align-items: center;
  gap: 12px;
}

#auth-status .muted {
  font-size: 13px;
  color: var(--text-mute);
}

#auth-status .btn {
  padding: 6px 12px;
  font-size: 13px;
}

#theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text-dim);
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 16px;
  transition:
    background-color var(--transition-colors),
    color var(--transition-colors),
    border-color var(--transition-colors);
}

#theme-toggle:hover {
  color: var(--accent);
  border-color: var(--hover-bd);
}

.main-content {
  flex: 1;
  padding: 40px 28px;
  margin: 0 auto;
  width: 100%;
  max-width: 1200px;
}

.site-footer {
  border-top: 1px solid var(--line-soft);
  background: var(--bg-1);
  padding: 40px 28px;
  margin-top: auto;
}

.site-footer .container {
  margin: 0 auto;
  max-width: 1200px;
}

.site-footer .md-body {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.site-footer .footer-nav {
  display: flex;
  gap: 12px;
  font-size: 13px;
}

.site-footer .footer-nav a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition-colors);
}

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

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  .header-container {
    gap: 16px;
    padding: 12px 16px;
  }

  .nav-tabs {
    gap: 0;
    flex-wrap: wrap;
  }

  .nav-link {
    padding: 6px 12px;
    font-size: 13px;
  }

  .header-actions {
    gap: 8px;
  }

  .main-content {
    padding: 24px 16px;
  }

  .site-footer {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  .header-container {
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 12px;
  }

  .brand {
    order: 1;
    flex: 0 1 auto;
  }

  .header-actions {
    order: 2;
    flex: 0 1 auto;
  }

  .nav-tabs {
    order: 3;
    width: 100%;
    gap: 0;
  }

  .nav-link {
    flex: 1;
    padding: 6px 8px;
    font-size: 12px;
    text-align: center;
  }

  .main-content {
    padding: 20px 12px;
  }

  .site-footer {
    padding: 20px 12px;
  }
}