/* =============================================
   CARTHOGEN - Navigation (Enhanced)
   ============================================= */

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 2rem;
    background: rgba(6, 6, 9, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

nav.scrolled {
    padding: 0.75rem 2rem;
    background: rgba(6, 6, 9, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo - Enhanced */
.logo {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    text-decoration: none;
    transition: var(--transition-normal);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    width: 44px;
    height: 44px;
    position: relative;
}

.logo-icon::after {
    content: '';
    position: absolute;
    inset: -4px;
    background: var(--gradient-cyan);
    border-radius: 12px;
    opacity: 0;
    filter: blur(10px);
    transition: var(--transition-normal);
    z-index: -1;
}

.logo:hover .logo-icon::after {
    opacity: 0.4;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-size: 1.6rem;
    font-weight: 700;
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

/* Navigation Links - Enhanced */
.nav-links {
    display: flex;
    gap: 0.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.625rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
}

.nav-links a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-cyan);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
    border-radius: 1px;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.nav-links a:hover::before {
    width: 60%;
}

.nav-links a.active {
    color: var(--accent-cyan);
}

.nav-links a.active::before {
    width: 60%;
}

/* Navigation CTA - Enhanced */
.nav-cta {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.nav-cta .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
}

/* Theme Toggle Button */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-color-light);
    color: var(--accent-cyan);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: all var(--transition-normal);
}

.theme-toggle .icon-sun {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
    display: none;
}

/* Auto theme detection - show appropriate icon */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) .theme-toggle .icon-sun {
        display: block;
    }
    :root:not([data-theme="dark"]) .theme-toggle .icon-moon {
        display: none;
    }
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.lang-btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.lang-btn:hover {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
}

.lang-btn.active {
    color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.1);
}

.lang-btn:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 60%;
    background: var(--border-color);
}

/* Light mode specific nav adjustments */
[data-theme="light"] nav,
[data-theme="light"] nav.scrolled {
    background: rgba(248, 250, 252, 0.85);
}

[data-theme="light"] .theme-toggle,
[data-theme="light"] .lang-switcher {
    background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .lang-btn:hover {
    background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .lang-btn.active {
    background: rgba(8, 145, 178, 0.1);
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) nav,
    :root:not([data-theme="dark"]) nav.scrolled {
        background: rgba(248, 250, 252, 0.85);
    }

    :root:not([data-theme="dark"]) .theme-toggle,
    :root:not([data-theme="dark"]) .lang-switcher {
        background: rgba(0, 0, 0, 0.03);
    }

    :root:not([data-theme="dark"]) .theme-toggle:hover {
        background: rgba(0, 0, 0, 0.06);
    }

    :root:not([data-theme="dark"]) .lang-btn:hover {
        background: rgba(0, 0, 0, 0.03);
    }

    :root:not([data-theme="dark"]) .lang-btn.active {
        background: rgba(8, 145, 178, 0.1);
    }
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 20px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 1px;
    transition: var(--transition-normal);
}

.mobile-menu-btn:hover span {
    background: var(--accent-cyan);
}

/* Mobile Navigation */
@media (max-width: 900px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(6, 6, 9, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-color);
        padding: 1rem;
        gap: 0;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 1rem;
        border-radius: 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .nav-cta .btn-ghost {
        display: none;
    }
}