/**
 * TabMail - Header Styles
 * 
 * Shared header and navigation styles.
 * Requires: palette.css, base.css
 */

/* ============================================
   Fixed Header
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 1.5rem 2rem;
  background: var(--page-bg);
  border-bottom: 1px solid var(--button-bg);
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

@media (prefers-color-scheme: dark) {
  .header {
    background: var(--page-bg-dark);
    border-bottom-color: var(--button-bg-dark);
  }
}

.header-left {
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* ============================================
   Logo
   ============================================ */
.logo-link {
  display: flex;
  align-items: center;
}

.logo-link img {
  height: 32px;
  width: auto;
}

/* ============================================
   Page Indicator (Dashboard page only - with underline)
   ============================================ */
.page-indicator {
  color: var(--text-color);
  font-size: 0.9375rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 0.25rem;
  margin-left: 100px;
}

.page-indicator::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-color);
}

@media (prefers-color-scheme: dark) {
  .page-indicator {
    color: var(--text-color-dark);
  }

  .page-indicator::after {
    background: var(--accent-color-dark);
  }
}

/* ============================================
   Header Dashboard Link (other pages - no underline)
   Same positioning as page-indicator for consistency
   ============================================ */
.header-dashboard-link {
  color: var(--text-color);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  margin-left: 100px;
  transition: opacity 0.2s ease;
}

.header-dashboard-link:hover {
  opacity: 0.7;
  text-decoration: none;
}

@media (prefers-color-scheme: dark) {
  .header-dashboard-link {
    color: var(--text-color-dark);
  }
}

@media (max-width: 768px) {
  .header-dashboard-link {
    margin-left: 0;
    font-size: 0.8125rem;
  }
}

/* ============================================
   Navigation Links
   ============================================ */
.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--text-color);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: opacity 0.2s ease;
}

.nav-link:hover {
  opacity: 0.7;
  text-decoration: none;
}

.nav-link.active {
  position: relative;
  padding-bottom: 0.25rem;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-color);
}

@media (prefers-color-scheme: dark) {
  .nav-link {
    color: var(--text-color-dark);
  }

  .nav-link.active::after {
    background: var(--accent-color-dark);
  }
}

/* ============================================
   Sign In/Out Button
   Normalized for both <a> and <button> elements
   ============================================ */
.sign-in-btn {
  /* Reset defaults for consistency between <a> and <button> */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  font-family: inherit;
  
  /* Fixed dimensions for consistency */
  min-width: 90px;
  height: 36px;
  padding: 0 1.25rem;
  
  /* Typography */
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  
  /* Appearance */
  color: var(--text-color);
  background: var(--button-bg);
  border: 1px solid var(--button-bg-hover);
  border-radius: 8px;
  text-decoration: none;
  
  /* Interaction */
  cursor: pointer;
  transition: all 0.2s ease;
}

.sign-in-btn:hover {
  background: var(--button-bg-hover);
  text-decoration: none;
}

@media (prefers-color-scheme: dark) {
  .sign-in-btn {
    color: var(--text-color-dark);
    background: var(--button-bg-dark);
    border-color: var(--button-bg-hover-dark);
  }
  
  .sign-in-btn:hover {
    background: var(--button-bg-hover-dark);
  }
}

/* ============================================
   Mobile Hamburger Menu
   ============================================ */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-color);
  line-height: 0;
}

@media (prefers-color-scheme: dark) {
  .mobile-menu-btn {
    color: var(--text-color-dark);
  }
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

.mobile-nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--page-bg);
  border: 1px solid var(--button-bg);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 160px;
  z-index: 200;
  padding: 0.5rem 0;
}

.mobile-nav-dropdown.open {
  display: block;
}

@media (prefers-color-scheme: dark) {
  .mobile-nav-dropdown {
    background: var(--page-bg-dark);
    border-color: var(--button-bg-dark);
  }
}

.mobile-nav-dropdown a,
.mobile-nav-dropdown button {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  text-align: left;
  color: var(--text-color);
  text-decoration: none;
  font-size: 0.9375rem;
  background: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.mobile-nav-dropdown a:hover,
.mobile-nav-dropdown button:hover {
  background: var(--button-bg);
}

@media (prefers-color-scheme: dark) {
  .mobile-nav-dropdown a,
  .mobile-nav-dropdown button {
    color: var(--text-color-dark);
  }

  .mobile-nav-dropdown a:hover,
  .mobile-nav-dropdown button:hover {
    background: var(--button-bg-dark);
  }
}

/* ============================================
   Mobile Header Styles
   ============================================ */
@media (max-width: 768px) {
  .header {
    padding: 1rem 1rem;
    gap: 0.75rem;
  }

  .header-left {
    gap: 0.75rem;
  }

  .logo-link img {
    height: 28px;
  }

  .page-indicator {
    font-size: 0.8125rem;
    margin-left: 0;
  }

  /* Hide desktop nav, show hamburger */
  .nav-links .nav-link,
  .nav-links .sign-in-btn {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .nav-links {
    position: relative;
  }
}