/* ========================================
   Header Professional Enhancements
   Inspired by Coursera/LinkedIn Learning
   v2.3.6-dev (2025-12-24)

   Modern styling, smooth animations,
   professional appearance
   ======================================== */

/* ===== HEADER BASE ENHANCEMENTS ===== */
.main-header {
    background: rgba(255, 255, 255, 0.98) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08) !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06) !important;
    transition: box-shadow 0.3s ease, background 0.3s ease !important;
}

/* Enhanced shadow on scroll (add .scrolled class via JS if needed) */
.main-header.scrolled,
.main-header:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12) !important;
}

/* Header container spacing */
.main-header-container {
    max-width: 1400px !important;
    padding: 0 24px !important;
}

/* ===== LOGO SECTION ===== */
.header-logo-section .logo-link {
    transition: opacity 0.2s ease !important;
}

.header-logo-section .logo-link:hover {
    opacity: 0.85 !important;
}

.logo-text {
    font-weight: 700 !important;
    font-size: 20px !important;
    background: linear-gradient(135deg, #1c1d1f 0%, #3d3e40 100%) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
}

/* ===== SEARCH BAR MODERN STYLE ===== */
.header-search-section {
    flex: 1 !important;
    max-width: 500px !important;
    margin: 0 32px !important;
}

.search-input-wrapper {
    position: relative !important;
    width: 100% !important;
}

.search-input {
    width: 100% !important;
    height: 44px !important;
    padding: 0 48px 0 20px !important;
    border: 2px solid #e4e8eb !important;
    border-radius: 24px !important;
    background: #f7f9fa !important;
    font-size: 14px !important;
    color: #1c1d1f !important;
    transition: all 0.25s ease !important;
}

.search-input::placeholder {
    color: #6a6f73 !important;
}

.search-input:hover {
    border-color: #d1d7dc !important;
    background: #ffffff !important;
}

.search-input:focus {
    outline: none !important;
    border-color: #6C3CE1 !important;
    background: #ffffff !important;
    box-shadow: 0 0 0 3px rgba(164, 53, 240, 0.15) !important;
}

.search-submit-btn {
    position: absolute !important;
    right: 4px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 36px !important;
    height: 36px !important;
    border: none !important;
    background: #6C3CE1 !important;
    color: #ffffff !important;
    border-radius: 50% !important;
    cursor: pointer !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: all 0.2s ease !important;
}

.search-submit-btn:hover {
    background: #8710d8 !important;
    transform: translateY(-50%) scale(1.05) !important;
}

.search-submit-btn i {
    font-size: 14px !important;
}

/* ===== NAVIGATION LINKS ===== */
.nav-link {
    position: relative !important;
    padding: 8px 16px !important;
    font-size: 14px !important;
    font-weight: 500 !important;
    color: #1c1d1f !important;
    text-decoration: none !important;
    border-radius: 8px !important;
    transition: all 0.2s ease !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
}

.nav-link::after {
    content: '' !important;
    position: absolute !important;
    bottom: 0 !important;
    left: 50% !important;
    width: 0 !important;
    height: 2px !important;
    background: #6C3CE1 !important;
    transition: all 0.25s ease !important;
    transform: translateX(-50%) !important;
}

.nav-link:hover {
    color: #6C3CE1 !important;
    background: rgba(164, 53, 240, 0.06) !important;
}

.nav-link:hover::after {
    width: 60% !important;
}

.nav-link i {
    font-size: 14px !important;
    transition: transform 0.2s ease !important;
}

.nav-link:hover i {
    transform: scale(1.1) !important;
}

/* ===== CATEGORIES DROPDOWN ===== */
.categories-dropdown {
    position: relative !important;
}

.dropdown-trigger.categories-trigger {
    padding: 8px 14px !important;
    font-size: 14px !important;
    font-weight: 500 !important;
    color: #1c1d1f !important;
    background: transparent !important;
    border: 1px solid transparent !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 8px !important;
    transition: all 0.2s ease !important;
}

.dropdown-trigger.categories-trigger:hover {
    background: rgba(164, 53, 240, 0.06) !important;
    border-color: rgba(164, 53, 240, 0.2) !important;
    color: #6C3CE1 !important;
}

.dropdown-arrow {
    font-size: 10px !important;
    transition: transform 0.25s ease !important;
}

.dropdown-arrow.rotated {
    transform: rotate(180deg) !important;
}

/* Dropdown menu */
.dropdown-menu.categories-menu {
    position: absolute !important;
    top: calc(100% + 8px) !important;
    left: 0 !important;
    min-width: 400px !important;
    background: #ffffff !important;
    border-radius: 12px !important;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15) !important;
    border: 1px solid rgba(0, 0, 0, 0.08) !important;
    padding: 16px !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transform: translateY(-10px) !important;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
    z-index: 1000 !important;
}

.dropdown-menu.categories-menu.show {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
}

/* Categories grid */
.categories-grid {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 8px !important;
}

.category-item {
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    padding: 10px 12px !important;
    border-radius: 8px !important;
    text-decoration: none !important;
    transition: all 0.2s ease !important;
}

.category-item:hover {
    background: #f7f9fa !important;
    transform: translateX(4px) !important;
}

.category-icon {
    width: 36px !important;
    height: 36px !important;
    border-radius: 8px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    color: #ffffff !important;
    font-size: 14px !important;
    flex-shrink: 0 !important;
}

.category-label {
    font-size: 13px !important;
    font-weight: 500 !important;
    color: #1c1d1f !important;
}

.category-item:hover .category-label {
    color: #6C3CE1 !important;
}

/* Categories footer */
.categories-footer {
    display: flex !important;
    justify-content: space-between !important;
    padding-top: 12px !important;
    margin-top: 12px !important;
    border-top: 1px solid #e4e8eb !important;
}

.view-all-link,
.browse-courses-link {
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
    font-size: 13px !important;
    font-weight: 600 !important;
    color: #6C3CE1 !important;
    text-decoration: none !important;
    transition: all 0.2s ease !important;
}

.view-all-link:hover,
.browse-courses-link:hover {
    color: #8710d8 !important;
    transform: translateX(2px) !important;
}

/* ===== AUTH BUTTONS ===== */
.auth-buttons {
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    padding: 6px 8px !important;
    background: rgba(247, 249, 250, 0.8) !important;
    border-radius: 10px !important;
    border: 1px solid rgba(0, 0, 0, 0.06) !important;
}

/* Login button - Outline style */
.btn.btn-outline {
    padding: 8px 18px !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    color: #1c1d1f !important;
    background: transparent !important;
    border: 2px solid #1c1d1f !important;
    border-radius: 6px !important;
    text-decoration: none !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
    transition: all 0.2s ease !important;
}

.btn.btn-outline:hover {
    background: #1c1d1f !important;
    color: #ffffff !important;
}

/* Sign Up button - Primary gradient */
.btn.btn-primary,
.btn.btn-cta-signup {
    padding: 8px 20px !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    color: #ffffff !important;
    background: linear-gradient(135deg, #6C3CE1 0%, #8710d8 100%) !important;
    border: none !important;
    border-radius: 6px !important;
    text-decoration: none !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
    box-shadow: 0 4px 12px rgba(164, 53, 240, 0.3) !important;
    transition: all 0.2s ease !important;
    position: relative !important;
    overflow: hidden !important;
}

.btn.btn-primary::before,
.btn.btn-cta-signup::before {
    content: '' !important;
    position: absolute !important;
    top: 0 !important;
    left: -100% !important;
    width: 100% !important;
    height: 100% !important;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent) !important;
    transition: left 0.5s ease !important;
}

.btn.btn-primary:hover,
.btn.btn-cta-signup:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 20px rgba(164, 53, 240, 0.4) !important;
}

.btn.btn-primary:hover::before,
.btn.btn-cta-signup:hover::before {
    left: 100% !important;
}

/* ===== MOBILE MENU TOGGLE ===== */
.mobile-menu-toggle {
    display: none !important;
    width: 44px !important;
    height: 44px !important;
    border: 1px solid #e4e8eb !important;
    border-radius: 10px !important;
    background: #ffffff !important;
    color: #1c1d1f !important;
    cursor: pointer !important;
    align-items: center !important;
    justify-content: center !important;
    transition: all 0.2s ease !important;
}

.mobile-menu-toggle:hover {
    background: #f7f9fa !important;
    border-color: #d1d7dc !important;
}

.mobile-menu-toggle i {
    font-size: 18px !important;
}

/* ===== USER MENU ===== */
.user-menu-trigger {
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    padding: 6px 12px 6px 6px !important;
    background: #f7f9fa !important;
    border: 1px solid #e4e8eb !important;
    border-radius: 100px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
}

.user-menu-trigger:hover {
    background: #ffffff !important;
    border-color: #d1d7dc !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
}

.user-avatar {
    width: 32px !important;
    height: 32px !important;
    border-radius: 50% !important;
    background: linear-gradient(135deg, #6C3CE1 0%, #8710d8 100%) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.avatar-initials {
    font-size: 12px !important;
    font-weight: 600 !important;
    color: #ffffff !important;
}

.user-name {
    font-size: 14px !important;
    font-weight: 500 !important;
    color: #1c1d1f !important;
}

/* User dropdown */
.user-dropdown {
    position: absolute !important;
    top: calc(100% + 8px) !important;
    right: 0 !important;
    min-width: 280px !important;
    background: #ffffff !important;
    border-radius: 12px !important;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15) !important;
    border: 1px solid rgba(0, 0, 0, 0.08) !important;
    padding: 8px !important;
    z-index: 1000 !important;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .header-search-section {
        max-width: 350px !important;
        margin: 0 20px !important;
    }
}

@media (max-width: 768px) {
    .main-header-container {
        padding: 0 16px !important;
    }

    .header-search-section {
        display: none !important;
    }

    .desktop-only {
        display: none !important;
    }

    .mobile-menu-toggle {
        display: flex !important;
    }

    /* FIXED: Keep auth buttons visible on mobile - compact style */
    .auth-buttons {
        display: flex !important;
        padding: 4px !important;
        gap: 6px !important;
        background: transparent !important;
        border: none !important;
    }

    .auth-buttons .btn {
        padding: 6px 12px !important;
        font-size: 13px !important;
    }

    /* Categories dropdown - responsive sizing */
    .dropdown-menu.categories-menu {
        min-width: auto !important;
        width: calc(100vw - 32px) !important;
        max-width: 350px !important;
        left: 50% !important;
        transform: translateX(-50%) translateY(-10px) !important;
        max-height: 70vh !important;
        overflow-y: auto !important;
    }

    .dropdown-menu.categories-menu.show {
        transform: translateX(-50%) translateY(0) !important;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 6px !important;
    }

    .category-item {
        padding: 8px 10px !important;
    }

    .category-icon {
        width: 28px !important;
        height: 28px !important;
        font-size: 12px !important;
    }

    .category-label {
        font-size: 12px !important;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    .main-header,
    .nav-link,
    .btn,
    .dropdown-menu,
    .category-item {
        transition: none !important;
    }

    .btn.btn-primary::before,
    .btn.btn-cta-signup::before {
        display: none !important;
    }
}

/* Focus states */
.nav-link:focus,
.dropdown-trigger:focus,
.btn:focus,
.search-input:focus {
    outline: 2px solid #6C3CE1 !important;
    outline-offset: 2px !important;
}