/**
 * Unified Header Styles for QuizzMan Systems
 * Layout: [Hamburger (mobile)] [Logo + Page Title] [Social Buttons] [User Avatar]
 * Version: 1.0.0
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
  --header-height: 64px;
  --header-bg: #ffffff;
  --header-border: #e5e7eb;
  --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  
  --brand-primary: #667eea;
  --brand-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  
  --btn-hover-bg: rgba(102, 126, 234, 0.1);
  --btn-active-bg: rgba(102, 126, 234, 0.15);
  
  --avatar-size: 36px;
  --btn-size: 40px;
  --btn-size-mobile: 36px;
  
  --z-header: 1000;
  --z-dropdown: 1100;
}

/* ============================================
   Base Header Structure
   ============================================ */
.qm-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  box-shadow: var(--header-shadow);
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  padding: 0 16px;
}

.qm-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  gap: 16px;
}

/* ============================================
   Left Section: Hamburger + Brand
   ============================================ */
.qm-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Hamburger Button - Only visible on mobile/tablet */
.qm-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--btn-size-mobile);
  height: var(--btn-size-mobile);
  border: none;
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.qm-hamburger:hover {
  background: var(--btn-hover-bg);
}

.qm-hamburger:active {
  background: var(--btn-active-bg);
  transform: scale(0.95);
}

.qm-hamburger i {
  font-size: 18px;
}

/* Brand Section */
.qm-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.qm-brand:hover {
  text-decoration: none;
}

.qm-brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: contain;
  flex-shrink: 0;
}

.qm-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.qm-brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.qm-page-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ============================================
   Center Section: Spacer (flexible)
   ============================================ */
.qm-header-center {
  flex: 1;
  min-width: 0;
}

/* ============================================
   Right Section: Social Buttons + User
   ============================================ */
.qm-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Social Buttons Container */
.qm-social-buttons {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Social Button Base Style */
.qm-social-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--btn-size);
  height: var(--btn-size);
  border: none;
  background: transparent;
  border-radius: 12px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.qm-social-btn:hover {
  background: var(--btn-hover-bg);
  color: var(--brand-primary);
  transform: translateY(-1px);
}

.qm-social-btn:active {
  background: var(--btn-active-bg);
  transform: translateY(0) scale(0.95);
}

.qm-social-btn i {
  font-size: 17px;
}

/* Badge on social buttons */
.qm-social-btn .qm-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: linear-gradient(135deg, #ff4444, #ff6b6b);
  color: white;
  font-size: 10px;
  font-weight: 700;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(255, 68, 68, 0.4);
  animation: qm-badge-pulse 2s infinite;
}

.qm-social-btn .qm-badge:empty,
.qm-social-btn .qm-badge[data-count="0"] {
  display: none;
}

@keyframes qm-badge-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* Divider between social buttons and user */
.qm-header-divider {
  width: 1px;
  height: 28px;
  background: var(--header-border);
  margin: 0 8px;
}

/* ============================================
   User Avatar Dropdown
   ============================================ */
.qm-user-dropdown {
  position: relative;
}

.qm-user-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 4px;
  background: transparent;
  border: 1px solid var(--header-border);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.qm-user-toggle:hover {
  background: var(--btn-hover-bg);
  border-color: var(--brand-primary);
}

.qm-user-avatar {
  width: var(--avatar-size);
  height: var(--avatar-size);
  border-radius: 50%;
  object-fit: cover;
  background: var(--btn-hover-bg);
}

.qm-user-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  max-width: 120px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.qm-user-toggle .qm-chevron {
  font-size: 10px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.qm-user-dropdown.open .qm-chevron {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.qm-user-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: white;
  border: 1px solid var(--header-border);
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
  padding: 8px;
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
}

.qm-user-dropdown.open .qm-user-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.qm-menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.15s ease;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.qm-menu-item:hover {
  background: var(--btn-hover-bg);
  color: var(--brand-primary);
}

.qm-menu-item i {
  width: 18px;
  text-align: center;
  color: var(--text-secondary);
}

.qm-menu-item:hover i {
  color: var(--brand-primary);
}

.qm-menu-divider {
  height: 1px;
  background: var(--header-border);
  margin: 6px 0;
}

.qm-menu-item.danger {
  color: #ef4444;
}

.qm-menu-item.danger:hover {
  background: #fee2e2;
  color: #dc2626;
}

.qm-menu-item.danger i {
  color: #ef4444;
}

/* ============================================
   Auth States
   ============================================ */
.qm-auth-only {
  display: none;
}

body.authenticated .qm-auth-only {
  display: flex;
}

body.authenticated .qm-guest-only {
  display: none;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet and below */
@media (max-width: 1024px) {
  .qm-hamburger {
    display: flex;
  }
  
  .qm-user-name {
    display: none;
  }
  
  .qm-user-toggle {
    padding: 4px;
    border-radius: 50%;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .qm-header {
    padding: 0 12px;
    height: 56px;
  }
  
  .qm-header-inner {
    gap: 8px;
  }
  
  .qm-brand-logo {
    width: 32px;
    height: 32px;
  }
  
  .qm-brand-name {
    font-size: 15px;
  }
  
  .qm-page-title {
    font-size: 11px;
  }
  
  .qm-social-btn {
    width: var(--btn-size-mobile);
    height: var(--btn-size-mobile);
  }
  
  .qm-social-btn i {
    font-size: 16px;
  }
  
  .qm-header-divider {
    margin: 0 4px;
    height: 24px;
  }
  
  .qm-user-avatar {
    width: 32px;
    height: 32px;
  }
  
  /* Hide social buttons on very small screens - show in sidebar */
  .qm-social-buttons {
    display: none;
  }
  
  .qm-header-divider {
    display: none;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .qm-brand-text {
    display: none;
  }
  
  .qm-brand-logo {
    width: 36px;
    height: 36px;
  }
}

/* ============================================
   Dark Mode Support (optional)
   ============================================ */
@media (prefers-color-scheme: dark) {
  .qm-header.auto-dark {
    --header-bg: #1f2937;
    --header-border: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --btn-hover-bg: rgba(102, 126, 234, 0.2);
  }
  
  .qm-header.auto-dark .qm-user-menu {
    background: #1f2937;
  }
}

/* ============================================
   Body Offset for Fixed Header
   ============================================ */
body.has-qm-header {
  padding-top: var(--header-height);
}

@media (max-width: 768px) {
  body.has-qm-header {
    padding-top: 56px;
  }
}