/**
 * Apple-Style Header
 * Sticky header with backdrop blur
 * Version: 1.0.0
 * 
 * NOTE: Core CSS variables now sourced from design-system/tokens.css
 * Local variables below are header-specific overrides.
 */

/* ==========================================
   HEADER-SPECIFIC VARIABLES
   ========================================== */
:root {
    --header-height: 44px;
    --header-bg: rgba(0, 0, 0, 0.8);
    --header-text: rgba(255, 255, 255, 0.92);
    --header-text-hover: rgba(255, 255, 255, 1);
    --header-backdrop: blur(20px);
}

/* ==========================================
   HEADER CONTAINER
   ========================================== */
.apple-header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--header-bg);
    backdrop-filter: var(--header-backdrop);
    -webkit-backdrop-filter: var(--header-backdrop);
    z-index: 9999;
    transition: var(--transition-smooth);
    border-bottom: 1px solid rgba(255, 255, 255, 0);
}

.apple-header.scrolled {
    background: rgba(0, 0, 0, 0.92);
    border-bottom-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.header-container {
    max-width: 980px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 22px;
}

/* ==========================================
   LOGO
   ========================================== */
.header-logo {
    flex-shrink: 0;
}

.header-logo a {
    display: flex;
    align-items: center;
    color: var(--header-text);
    font-size: 21px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    letter-spacing: -0.02em;
}

.header-logo a:hover {
    color: var(--header-text-hover);
}

/* ==========================================
   MAIN NAVIGATION
   ========================================== */
.header-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--header-text);
    font-size: 12px;
    font-weight: 400;
    text-decoration: none;
    letter-spacing: -0.01em;
    transition: var(--transition-smooth);
    padding: 0 8px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: relative;
}

.nav-link:hover {
    color: var(--header-text-hover);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: #ffffff;
    border-radius: 50%;
}

/* ==========================================
   HEADER ACTIONS
   ========================================== */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.header-action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--header-text);
    cursor: pointer;
    transition: var(--transition-smooth);
    border-radius: 8px;
    font-size: 16px;
}

.header-action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--header-text-hover);
}

/* ==========================================
   USER MENU
   ========================================== */
.user-menu {
    position: relative;
}

.user-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    overflow: hidden;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-btn:hover {
    border-color: rgba(255, 255, 255, 0.6);
}

.user-avatar-small {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* User Dropdown */
.apple-header .user-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 280px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.24);
    border: none;
    padding-top: 0;
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-smooth);
    overflow: hidden;
    pointer-events: none;
    display: block !important;
    z-index: 10000;
}

.apple-header .user-menu:hover .user-dropdown,
.apple-header .user-menu.active .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.dropdown-header {
    display: flex;
    gap: 12px;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #ffffff;
    align-items: center;
}

.dropdown-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
    object-fit: cover;
}

.dropdown-user-info {
    flex: 1;
    min-width: 0;
}

.dropdown-name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-email {
    font-size: 12px;
    opacity: 0.8;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-divider {
    height: 1px;
    background: rgba(0, 0, 0, 0.08);
    margin: 4px 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: #1d1d1f;
    font-size: 14px;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.dropdown-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

.dropdown-item-icon {
    font-size: 14px;
    opacity: 0.6;
    width: 18px;
    text-align: center;
}

/* ==========================================
   MOBILE MENU TOGGLE
   ========================================== */
.mobile-menu-toggle {
    display: none;
    width: 32px;
    height: 32px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.mobile-menu-toggle span {
    width: 18px;
    height: 2px;
    background: var(--header-text);
    transition: var(--transition-smooth);
    border-radius: 1px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-7px);
}

/* ==========================================
   SEARCH OVERLAY
   ========================================== */
.search-overlay {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    padding: 24px;
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: var(--transition-smooth);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-container {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 16px 48px 16px 20px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: #ffffff;
    font-size: 17px;
    outline: none;
    transition: var(--transition-smooth);
}

.search-input:focus {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.4);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.search-close {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-close:hover {
    color: #ffffff;
}

.search-suggestions {
    max-width: 680px;
    margin: 16px auto 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.suggestion-item {
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.suggestion-item:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
}

/* ==========================================
   MOBILE MENU OVERLAY
   ========================================== */
.mobile-menu-overlay {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: rgba(0, 0, 0, 0.98);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.28, 0.11, 0.32, 1), opacity 0.4s;
    overflow-y: auto;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    padding: 24px;
}

.mobile-nav-link {
    padding: 16px 0;
    color: rgba(255, 255, 255, 0.92);
    font-size: 24px;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-smooth);
}

.mobile-nav-link:hover {
    color: #ffffff;
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

/* ==========================================
   BODY STATES
   ========================================== */
body.search-open,
body.menu-open {
    overflow: hidden;
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 1068px) {
    .header-container {
        max-width: 692px;
    }
    
    .header-nav {
        gap: 24px;
    }
    
    .nav-link {
        font-size: 11px;
        padding: 0 6px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 48px;
    }
    
    .header-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .header-action-btn.search-btn {
        order: -1;
    }
    
    .user-dropdown {
        width: 260px;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 0 16px;
    }
    
    .header-actions {
        gap: 8px;
    }
    
    .header-logo a {
        font-size: 18px;
    }
}