/* Centralized Header Styles for /learn directory */
/* Utilizing #global-header for maximum CSS specificity to override old inline styles */

#global-header.top-nav {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    padding: 25px 30px 15px !important;
    background: transparent !important;
    position: relative !important;
    border-bottom: 1px solid var(--dynamic-nav-border) !important;
}

#global-header .nav-left {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    flex: 1 1 0% !important;
    min-width: 0 !important;
    justify-content: flex-start !important;
}

#global-header .back-btn {
    width: 42px !important;
    height: 42px !important;
    background: var(--dynamic-nav-bg) !important;
    backdrop-filter: blur(10px) !important;
    border: 1px solid var(--dynamic-nav-border) !important;
    border-radius: 12px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    text-decoration: none !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1) !important;
    padding: 0 !important;
    color: var(--dynamic-text-primary) !important;
    flex-shrink: 0 !important;
}

@media (hover: hover) {
    #global-header .back-btn:hover {
        transform: translateX(-3px) !important;
        background: var(--dynamic-nav-hover) !important;
    }
}

#global-header .back-btn svg {
    width: 24px !important;
    height: 24px !important;
    fill: currentColor !important;
}

/* Centered branding — middle flex child, naturally centered between equal flex-1 siblings */
#global-header .nav-center-brand {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 10px !important;
    pointer-events: none !important;
    flex: 0 0 auto !important;
    position: static !important;
    transform: none !important;
    left: auto !important;
    white-space: nowrap !important;
}

#global-header .branding-icon {
    width: 48px !important;
    height: 48px !important;
    background: var(--dynamic-nav-bg) !important;
    border-radius: 16px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    border: 1px solid var(--dynamic-nav-border) !important;
    backdrop-filter: blur(10px) !important;
    overflow: hidden !important;
    flex-shrink: 0 !important;
}

#global-header .branding-icon img {
    width: 32px !important;
    height: 32px !important;
    object-fit: contain !important;
}

#global-header .branding-text {
    font-size: 18px !important;
    font-weight: 700 !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2) !important;
    color: var(--dynamic-text-primary) !important;
    white-space: nowrap !important;
}

/* ── Course / Language Name Pill Badge ────────────────────────────── */
#global-header .nav-course-title {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    position: relative !important;
    min-width: 30px !important;
    max-width: 260px !important;
    flex: 0 1 auto !important;
    height: 36px !important;
    padding: 0 14px !important;
    background: var(--dynamic-nav-bg, rgba(255, 255, 255, 0.12)) !important;
    border: 1px solid var(--dynamic-nav-border, rgba(255, 255, 255, 0.18)) !important;
    border-radius: 20px !important;
    backdrop-filter: blur(10px) !important;
    -webkit-backdrop-filter: blur(10px) !important;
    overflow: hidden !important;
    white-space: nowrap !important;
    user-select: none !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
    box-sizing: border-box !important;
    transition: background 0.3s ease, border-color 0.3s ease, max-width 0.3s ease !important;
    margin-right: auto !important;
    margin-left: 20px !important;
}

#global-header .nav-course-title .nav-title-track {
    display: inline-flex !important;
    align-items: center !important;
    white-space: nowrap !important;
    will-change: transform !important;
}

#global-header .nav-course-title .nav-title-text {
    font-size: 13px !important;
    font-weight: 600 !important;
    letter-spacing: 0.3px !important;
    color: var(--dynamic-text-primary, #ffffff) !important;
    white-space: nowrap !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2) !important;
    display: inline-block !important;
}

#global-header .nav-course-title .nav-title-separator,
#global-header .nav-course-title .nav-title-duplicate {
    display: none !important;
}

/* When overflowing / space is too low -> activate smooth continuous marquee */
#global-header .nav-course-title.is-overflowing {
    justify-content: flex-start !important;
    mask-image: linear-gradient(90deg, transparent 0%, #000 12px, #000 calc(100% - 12px), transparent 100%) !important;
    -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 12px, #000 calc(100% - 12px), transparent 100%) !important;
}

#global-header .nav-course-title.is-overflowing .nav-title-separator {
    display: inline-block !important;
    margin: 0 14px !important;
    color: var(--dynamic-text-secondary, rgba(255, 255, 255, 0.7)) !important;
    font-size: 9px !important;
    opacity: 0.8 !important;
}

#global-header .nav-course-title.is-overflowing .nav-title-duplicate {
    display: inline-block !important;
}

#global-header .nav-course-title.is-overflowing .nav-title-track {
    animation: navTitleMarquee 8s linear infinite !important;
}

#global-header .nav-course-title.is-overflowing:hover .nav-title-track {
    animation-play-state: paused !important;
}

@keyframes navTitleMarquee {
    0% {
        transform: translateX(0%);
    }
    100% {
        transform: translateX(-50%);
    }
}

#global-header .nav-right {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    flex: 1 1 0% !important;
    min-width: 0 !important;
    justify-content: flex-end !important;
}

/* Page specific elements styling */
#global-header .nav-icons {
    display: flex !important;
    align-items: center !important;
    gap: 15px !important;
}

#global-header .nav-icon {
    width: 45px !important;
    height: 45px !important;
    background: var(--nav-icon-bg, var(--dynamic-nav-bg)) !important;
    border: 1px solid var(--nav-icon-border, var(--dynamic-nav-border)) !important;
    border-radius: 12px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    color: var(--dynamic-text-primary) !important;
}

#global-header .nav-icon svg {
    width: 22px !important;
    height: 22px !important;
}

#global-header .nav-icon svg:not([fill="none"]) {
    fill: currentColor !important;
}

#global-header .nav-icon.active-saved svg:not([fill="none"]) {
    fill: #fbbf24 !important;
}

#global-header .search-container {
    display: flex;
    align-items: center;
}
#global-header .search-bar {
    display: flex !important;
    align-items: center !important;
    background: var(--dynamic-nav-bg) !important;
    border: 1px solid var(--dynamic-nav-border) !important;
    border-radius: 24px !important;
    padding: 0 15px !important;
    height: 40px !important;
    width: 200px !important;
}
#global-header .search-input {
    background: transparent !important;
    border: none !important;
    outline: none !important;
    color: var(--dynamic-text-primary) !important;
    width: 100% !important;
}

/* Media Queries for Header Tiers (Tier 2 to 6 logic) */

/* Mobile (Portrait or Small Landscape) */
@media (max-width: 480px), (max-height: 499px) {
    #global-header.top-nav {
        padding: 8px 25px !important;
        height: 52px !important;
    }
    #global-header .nav-left { gap: 6px !important; }
    #global-header .nav-icons { gap: 6px !important; }
    #global-header .back-btn { width: 32px !important; height: 32px !important; }
    #global-header .back-btn svg { width: 16px !important; height: 16px !important; }
    #global-header .branding-icon { width: 28px !important; height: 28px !important; min-height:28px !important;}
    #global-header .branding-icon img { width: 18px !important; height: 18px !important; }
    #global-header .branding-text { font-size: 11px !important; }
    #global-header .nav-icon { width: 32px !important; height: 32px !important; }
    #global-header .nav-icon svg { width: 16px !important; height: 16px !important; }
    #global-header .nav-course-title {
        height: 28px !important;
        padding: 0 8px !important;
        max-width: 120px !important;
        margin-left: 8px !important;
        margin-right: auto !important;
        border-radius: 14px !important;
    }
    #global-header .nav-course-title .nav-title-text {
        font-size: 11px !important;
    }
    #global-header .nav-course-title .nav-title-separator {
        margin: 0 8px !important;
        font-size: 7px !important;
    }
}

/* Small Tablet / Narrow devices */
@media (min-width: 481px) and (max-width: 850px) and (min-height: 500px) {
    #global-header.top-nav {
        padding: 10px 15px !important;
        height: 56px !important;
    }
    #global-header .nav-left { gap: 8px !important; }
    #global-header .nav-icons { gap: 8px !important; }
    #global-header .back-btn { width: 36px !important; height: 36px !important; }
    #global-header .back-btn svg { width: 18px !important; height: 18px !important; }
    #global-header .branding-icon { width: 32px !important; height: 32px !important; }
    #global-header .branding-icon img { width: 20px !important; height: 20px !important; }
    #global-header .branding-text { font-size: 14px !important; }
    #global-header .nav-icon { width: 36px !important; height: 36px !important; }
    #global-header .nav-icon svg { width: 18px !important; height: 18px !important; }
    #global-header .nav-course-title {
        height: 32px !important;
        padding: 0 10px !important;
        max-width: 180px !important;
        margin-left: 15px !important;
        margin-right: auto !important;
        border-radius: 16px !important;
    }
    #global-header .nav-course-title .nav-title-text {
        font-size: 12px !important;
    }
}

/* Large Tablet / Desktop */
@media (min-width: 851px) and (min-height: 500px) {
    #global-header.top-nav {
        padding: 20px 25px 12px !important;
        height: 75px !important;
    }
    #global-header .back-btn { width: 46px !important; height: 46px !important; border-radius: 12px !important; }
    #global-header .back-btn svg { width: 22px !important; height: 22px !important; }
    #global-header .branding-icon { width: 46px !important; height: 46px !important; }
    #global-header .branding-icon img { width: 30px !important; height: 30px !important; }
    #global-header .branding-text { font-size: 20px !important; }
    #global-header .nav-icon { width: 42px !important; height: 42px !important; border-radius: 14px !important; }
    #global-header .nav-course-title {
        height: 38px !important;
        padding: 0 14px !important;
        max-width: 280px !important;
        margin-left: 25px !important;
        margin-right: auto !important;
        border-radius: 20px !important;
    }
    #global-header .nav-course-title .nav-title-text {
        font-size: 14px !important;
    }
}