/**
 * Navigation Styles
 * Navigazione laterale e bottone torna su
 * (Saranno implementati completamente nella FASE 2)
 */

/* Sidebar Navigation */
.sidebar-nav {
    position: fixed;
    left: 30px;
    top: 30px;
    z-index: 1000;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    opacity: 1;
    visibility: visible;
}

.sidebar-nav.hidden {
    opacity: 0;
    visibility: hidden;
}

.sidebar-nav ul {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: rgba(255, 255, 255, 0.22);
    padding: 12px 10px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.sidebar-nav .nav-link {
    display: block;
    padding: 3px 10px;
    line-height: 1;
    color: var(--color-text);
    font-weight: 500;
    font-size: 1.1rem;
    text-transform: uppercase;
    text-align: right;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.7);
    transition: color 0.3s ease;
}

.sidebar-nav .nav-link:hover {
    color: var(--color-detail);
}

.sidebar-nav .nav-link.active {
    color: var(--color-detail);
    font-weight: 600;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    background: var(--color-detail);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 15px rgba(61, 143, 163, 0.4);
    transition: all 0.3s ease;
    z-index: 1000;
    cursor: pointer;
    opacity: 1;
    visibility: visible;
}

.back-to-top.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
}

.back-to-top:hover {
    background: var(--color-accent);
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 8px 25px rgba(61, 143, 163, 0.5);
}

.back-to-top:active {
    transform: translateY(-3px) scale(1);
}

/* ===== Custom Scrollbar ===== */
.custom-scrollbar {
    position: fixed;
    right: 52px;
    top: 55px;
    bottom: 52px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 12px;
    pointer-events: none;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    opacity: 1;
    visibility: visible;
}

.custom-scrollbar.hidden {
    opacity: 0;
    visibility: hidden;
}

.scrollbar-glass {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 12px;
    flex: 1;
    background: rgba(255, 255, 255, 0.14);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: 100px;
    overflow: hidden;
}

.scrollbar-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-detail);
    flex-shrink: 0;
}

.scrollbar-track {
    flex: 1;
    width: 12px;
    background: transparent;
    position: relative;
    border-radius: 6px;
    overflow: hidden;
}

.scrollbar-thumb {
    position: absolute;
    left: 0;
    right: 0;
    width: 12px;
    min-height: 18px;
    background: var(--color-detail);
    border-radius: 6px;
    top: 0;
    transition: top 0.08s linear, background 0.2s ease;
    pointer-events: auto;
    cursor: grab;
}

.scrollbar-thumb:hover {
    background: var(--color-accent);
}

.scrollbar-thumb.dragging {
    background: var(--color-accent);
    transition: background 0.2s ease;
}

.scrollbar-thumb:active {
    cursor: grabbing;
}

@media (max-width: 768px) {
    .custom-scrollbar { display: none; }
}

/* Mobile Navigation (hamburger menu - implementato in responsive) */
.mobile-nav-toggle {
    display: none;
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--color-detail);
    border-radius: 10px;
    z-index: 1001;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.mobile-nav-toggle span {
    width: 25px;
    height: 3px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(9px);
}

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

.mobile-nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-9px);
}