/* ==========================================================================
   Navigation
   ========================================================================== */
.nav {
  background: var(--surface-base);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-content {
  display: flex;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 56px;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  margin-right: var(--space-8);
  flex-shrink: 0;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: space-between;
}

.nav-links-center {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-links-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-left: auto;
}

.nav-link {
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color 0.15s;
}

.nav-link:hover {
  color: var(--ink-primary);
}

.nav-link-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  border-radius: 0;
}

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

.nav-user-link {
  font-size: 0.875rem;
  color: var(--ink-secondary);
  font-weight: 500;
}

.nav-logout-form {
  display: inline;
}

.nav-logout-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  color: var(--ink-secondary);
}

.nav-logout-btn:hover {
  color: var(--ink-primary);
}

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  margin-left: auto;
}

.hamburger-icon {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink-primary);
  position: relative;
}

.hamburger-icon::before,
.hamburger-icon::after {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink-primary);
  position: absolute;
  left: 0;
}

.hamburger-icon::before {
  top: -6px;
}

.hamburger-icon::after {
  top: 6px;
}

/* ==========================================================================
   App content area (authenticated pages)
   ========================================================================== */
.app-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.app-content h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  color: var(--ink-primary);
}

.app-content p {
  color: var(--ink-secondary);
}

/* ==========================================================================
   Public page styles (landing / newsletter)
   ========================================================================== */
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 57px);
  padding: var(--space-8);
}

.footer {
  margin-top: var(--space-8);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
}

/* ==========================================================================
   Mobile nav scrim (backdrop behind open menu)
   ========================================================================== */
.nav-scrim {
  display: none;
}

/* ==========================================================================
   Mobile nav section label
   ========================================================================== */
.nav-section-label {
  display: none;
}

/* ==========================================================================
   Mobile responsive — layout
   ========================================================================== */
@media (max-width: 768px) {
  .nav-content {
    padding: 0 var(--space-4);
  }

  .nav-hamburger {
    display: block;
  }

  /* Hamburger → X animation (BUG-7) */
  .nav-hamburger.active .hamburger-icon {
    background: transparent;
  }

  .nav-hamburger.active .hamburger-icon::before {
    top: 0;
    transform: rotate(45deg);
  }

  .nav-hamburger.active .hamburger-icon::after {
    top: 0;
    transform: rotate(-45deg);
  }

  .hamburger-icon,
  .hamburger-icon::before,
  .hamburger-icon::after {
    transition: all 0.2s ease;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--surface-base);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2) 0;
    z-index: 101;
  }

  .nav-menu.open {
    display: flex;
  }

  /* Scrim (BUG-5) */
  .nav-scrim {
    display: none;
    position: fixed;
    inset: 0;
    top: 56px;
    background: rgba(0, 0, 0, 0.3);
    z-index: 99;
  }

  .nav-scrim.open {
    display: block;
  }

  .nav-links-center {
    flex-direction: column;
    padding: var(--space-1) 0;
  }

  .nav-links-center .nav-link {
    padding: var(--space-3) var(--space-6);
    border-radius: 0;
    border-bottom: none;
    text-align: center;
  }

  .nav-links-center .nav-link-active {
    color: var(--accent);
    background: var(--accent-subtle);
  }

  /* Section label (BUG-6) */
  .nav-section-label {
    display: block;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ink-muted);
    padding: var(--space-3) var(--space-6) var(--space-1);
    text-align: center;
  }

  .nav-links-right {
    flex-direction: column;
    align-items: stretch;
    border-top: 1px solid var(--border-emphasis);
    padding: 0 0 var(--space-2);
    margin-left: 0;
  }

  .nav-links-right .nav-link {
    padding: var(--space-3) var(--space-6);
    border-radius: 0;
    border-bottom: none;
    text-align: center;
  }

  .nav-links-right .nav-user-link {
    padding: var(--space-2) var(--space-6);
    text-align: center;
  }

  .nav-links-right .nav-logout-btn {
    padding: var(--space-3) var(--space-6);
    border-radius: 0;
    text-align: center;
    width: 100%;
  }

  .app-content {
    padding: var(--space-6) var(--space-4);
  }
}