/* Navigation Styles - Mobile First */

.main-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-4);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Brand */
.nav-brand {
    flex-shrink: 0;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: var(--font-weight-bold);
    transition: transform var(--transition-fast);
}

.brand-link:hover {
    transform: scale(1.05);
}

.brand-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.brand-name {
    font-size: var(--font-size-lg);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: calc(var(--z-sticky) + 1);
}

.hamburger {
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

/* Hamburger Animation */
.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* Mobile Menu */
.nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
}

.nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

/* Nav Groups */
.nav-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.nav-group-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    padding: var(--space-2) var(--space-4);
}

.nav-dropdown {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

/* Nav Links */
.nav-link {
    display: block;
    padding: var(--space-4);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-link:hover,
.nav-link:focus {
    background: var(--background);
    color: var(--primary);
}

.nav-link:active {
    background: var(--primary);
    color: var(--text-inverse);
}

/* Desktop Navigation */
@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .nav-menu {
        position: static;
        flex-direction: row;
        gap: var(--space-1);
        padding: 0;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: transparent;
        border: none;
        box-shadow: none;
        max-height: none;
        overflow: visible;
    }

    .nav-group {
        position: relative;
    }

    .nav-group-label {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-base);
        text-transform: none;
        letter-spacing: normal;
        color: var(--text-primary);
        cursor: pointer;
        font-weight: var(--font-weight-medium);
        border-radius: var(--radius-md);
        transition: all var(--transition-fast);
    }

    .nav-group-label:hover {
        background: var(--background);
    }

    .nav-dropdown {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 180px;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        padding: var(--space-2);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-fast);
        z-index: var(--z-dropdown);
    }

    .nav-group:hover .nav-dropdown {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-link {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-base);
        min-height: auto;
        border-radius: var(--radius-md);
    }
}