/**
 * Navigation Component
 *
 * Responsive breakpoints (from design-system.css):
 * - Mobile (xs): 480px and below
 * - Tablet (md): 768px and below
 * - Desktop (lg): 1024px and above
 */

/* Navigation */
.navigation {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: var(--border-accent);
    transition: var(--transition-base);
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(10px)) {
    .navigation {
        background: rgba(10, 10, 10, 0.95);
    }
}

/* Scrolled state */
.navigation--scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: var(--shadow-accent);
}

/* Container */
.navigation__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* List */
.navigation__list {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.navigation__item {
    display: inline-block;
}

/* Links */
.navigation__link {
    display: inline-block;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition-base);
    position: relative;
}

.navigation__link:hover {
    color: var(--color-accent-blue);
    background: rgba(255, 255, 255, 0.05);
}

.navigation__link:focus-visible {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 2px;
}

/* Active link */
.navigation__link--active {
    background: var(--gradient-accent);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}

.navigation__link--active::after {
    content: '';
    position: absolute;
    bottom: 0.25rem;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.navigation__link--active:hover {
    background: var(--gradient-accent);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Hamburger button (hidden on desktop) */
.navigation__hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    position: absolute;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1001;
}

.navigation__hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: var(--transition-base);
}

.navigation__hamburger:hover .navigation__hamburger-line {
    background: var(--color-accent-blue);
}

.navigation__hamburger:focus-visible {
    outline: 2px solid var(--color-accent-blue);
    outline-offset: 4px;
    border-radius: 4px;
}

/* Hamburger animation when menu is open */
.navigation--menu-open .navigation__hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.navigation--menu-open .navigation__hamburger-line:nth-child(2) {
    opacity: 0;
}

.navigation--menu-open .navigation__hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .navigation__container {
        min-height: 72px;
        padding: 0.5rem 2rem;
    }

    .navigation__hamburger {
        display: flex;
        min-width: 56px;
        min-height: 56px;
        padding: 1rem;
    }

    .navigation__list {
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        max-width: 80vw;
        height: 100vh;
        height: 100dvh; /* Dynamic viewport height for mobile browsers */
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-left: var(--border-accent);
        flex-direction: column;
        gap: 0;
        padding: 5rem 2rem 2rem;
        transform: translateX(100%);
        transition: var(--transition-transform);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 1000;
    }

    .navigation--menu-open .navigation__list {
        transform: translateX(0);
    }

    .navigation__item {
        width: 100%;
    }

    .navigation__link {
        display: block;
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 1.125rem;
        border-radius: 8px;
    }

    .navigation__link--active::after {
        left: 1.5rem;
        right: 1.5rem;
    }

    /* Backdrop overlay when menu is open */
    .navigation--menu-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        height: 100dvh; /* Dynamic viewport height for mobile browsers */
        background: rgba(0, 0, 0, 0.7);
        z-index: 999;
        animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }
}

/* Tablet specific (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .navigation__container {
        min-height: 72px;
        padding: 0.5rem 2rem;
    }

    .navigation__hamburger {
        display: flex;
        min-width: 56px;
        min-height: 56px;
        padding: 1rem;
    }

    .navigation__list {
        position: fixed;
        top: 0;
        right: 0;
        width: 320px;
        max-width: 50vw;
        height: 100vh;
        height: 100dvh;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-left: var(--border-accent);
        flex-direction: column;
        gap: 0;
        padding: 5rem 2rem 2rem;
        transform: translateX(100%);
        transition: var(--transition-transform);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 1000;
    }

    .navigation--menu-open .navigation__list {
        transform: translateX(0);
    }

    .navigation__item {
        width: 100%;
    }

    .navigation__link {
        display: block;
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 1.125rem;
        border-radius: 8px;
    }

    .navigation__link--active::after {
        left: 1.5rem;
        right: 1.5rem;
    }

    /* Backdrop for tablet */
    .navigation--menu-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        height: 100dvh;
        background: rgba(0, 0, 0, 0.7);
        z-index: 999;
        animation: fadeIn 0.3s ease;
    }
}

/* Small mobile optimization */
@media (max-width: 480px) {
    .navigation__container {
        min-height: 72px;
        padding: 0.5rem 1rem;
    }

    .navigation__hamburger {
        right: 1rem;
        min-width: 56px;
        min-height: 56px;
        padding: 1rem;
    }

    .navigation__list {
        width: 100%;
        max-width: 100vw;
        padding: 4rem 1.5rem 2rem;
    }

    .navigation__link {
        padding: 1rem;
        font-size: 1.0625rem;
    }
}

/* Animation for active state transition */
@media (prefers-reduced-motion: no-preference) {
    .navigation__link--active {
        animation: gradientShift 3s ease infinite;
        background-size: 200% 100%;
    }

    @keyframes gradientShift {
        0%, 100% {
            background-position: 0% 50%;
        }
        50% {
            background-position: 100% 50%;
        }
    }
}