/* ==================== HEADER ==================== */
/* Header, logo, language selector, font controls */

.header {
    margin-bottom: 3.125rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.9375rem;
}

.font-size-controls {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    border: none;
    border-radius: 0.625rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary, rgba(255, 255, 255, 0.3));
    backdrop-filter: var(--blur-medium);
    -webkit-backdrop-filter: var(--blur-medium);
    box-shadow: var(--glow-soft);
}

.font-control-btn {
    border: none;
    font-family: 'Raleway', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    transition: var(--transition);
    outline: none;
    min-width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary, rgba(255, 255, 255, 0.4));
    box-shadow: var(--glow-soft);
}

.font-control-btn:hover {
    background: rgba(255, 255, 255, 0.6);
    box-shadow: var(--glow-medium);
}

.font-control-btn:hover {
    transform: scale(1.05);
}

.font-control-btn:active {
    transform: scale(0.95);
}

/* Theme Buttons Container Fixed */
.theme-buttons-container {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Theme Button Fixed */
.theme-button-fixed {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: none;
    border-radius: 0.5rem 0 0 0.5rem;
    cursor: pointer;
    transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
    background: var(--bg-primary, rgba(255, 255, 255, 0.3));
    backdrop-filter: var(--blur-medium);
    -webkit-backdrop-filter: var(--blur-medium);
    box-shadow: var(--glow-soft);
}

.theme-button-fixed:hover {
    background: var(--bg-secondary, rgba(255, 255, 255, 0.5));
    backdrop-filter: var(--blur-strong);
    -webkit-backdrop-filter: var(--blur-strong);
    box-shadow: var(--glow-medium);
}

.theme-icon {
    width: 1.125rem;
    height: 1.125rem;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.theme-button-fixed:hover .theme-icon {
    transform: rotate(90deg);
}

/* Scroll Button Fixed */
.scroll-button-fixed {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: none;
    border-radius: 0.5rem 0 0 0.5rem;
    cursor: pointer;
    transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
    background: var(--bg-primary, rgba(255, 255, 255, 0.3));
    backdrop-filter: var(--blur-medium);
    -webkit-backdrop-filter: var(--blur-medium);
    box-shadow: var(--glow-soft);
}

.scroll-button-fixed:hover {
    background: var(--bg-secondary, rgba(255, 255, 255, 0.5));
    backdrop-filter: var(--blur-strong);
    -webkit-backdrop-filter: var(--blur-strong);
    box-shadow: var(--glow-medium);
}

.scroll-icon {
    width: 1.125rem;
    height: 1.125rem;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.scroll-button-fixed:hover .scroll-icon {
    transform: scale(1.1);
}

.scroll-icon.scroll-up {
    transform: rotate(180deg);
}

.scroll-button-fixed:hover .scroll-icon.scroll-up {
    transform: rotate(180deg) scale(1.1);
}

.logo-img {
    height: 4.6875rem;
    width: auto;
    filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.6)) brightness(1.1);
    transition: var(--transition);
    opacity: 0.95;
}

.logo-img:hover {
    filter: drop-shadow(0 0 25px rgba(255, 255, 255, 0.8)) brightness(1.2);
    opacity: 1;
}

.logo-fallback {
    font-size: 2rem;
    font-weight: 300;
    color: var(--white);
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.6), 0 2px 10px rgba(179, 225, 255, 0.4);
}

.language-selector {
    border: none;
    border-radius: 0.75rem;
    padding: 0.625rem 2.5rem 0.625rem 1.125rem;
    font-family: 'Raleway', sans-serif;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background: var(--bg-primary, rgba(255, 255, 255, 0.3));
    backdrop-filter: var(--blur-medium);
    -webkit-backdrop-filter: var(--blur-medium);
    box-shadow: var(--glow-soft);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%231a5a7a' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 12px;
}

.language-selector:hover {
    background-color: var(--bg-secondary, rgba(255, 255, 255, 0.5));
    backdrop-filter: var(--blur-strong);
    -webkit-backdrop-filter: var(--blur-strong);
    box-shadow: var(--glow-medium);
}

.language-selector:focus {
    background-color: var(--bg-secondary, rgba(255, 255, 255, 0.5));
    box-shadow: var(--glow-medium);
}

.language-selector option {
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    padding: 0.625rem;
}

/* Guide Link */
.guide-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
}

.guide-link:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.guide-link svg {
    width: 18px;
    height: 18px;
}

/* Clear Button (search) */
.clear-btn {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-lighter);
    cursor: pointer;
    padding: 0.3125rem 0.625rem;
    line-height: 1;
    filter: drop-shadow(0 0 4px rgba(179, 225, 255, 0.3));
    transition: all 0.3s ease;
}

.clear-btn:hover {
    color: var(--text-secondary);
    transform: translateY(-50%) scale(1.2);
    filter: drop-shadow(0 0 8px rgba(179, 225, 255, 0.6));
}