/* Professional Navigation Header */
nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-white);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding: 1rem 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: all 300ms ease;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    padding: 0;
    max-width: 1400px;
    margin: 0 auto;
}

/* Logo Section */
.logo-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: transform 250ms ease;
    flex-shrink: 0;
}

.logo-container:hover {
    transform: translateY(-2px);
}

.logo-image {
    height: 80px;
    width: auto;
    object-fit: contain;
    display: block;
    transition: all 250ms ease;
    margin: 0;
    padding: 0;
}

/* Tagline in header - improved readability with stronger stroke */
.nav-tagline {
    flex: 1;
    text-align: center;
    padding: 0 1rem;
}

.nav-tagline h1 {
    font-size: 1.1rem;
    font-weight: 800;
    margin: 0;
    line-height: 1.3;
    letter-spacing: 0.01em;
    color: var(--color-black);
    -webkit-text-stroke: 0.8px rgba(0, 0, 0, 0.5);
    text-stroke: 0.8px rgba(0, 0, 0, 0.5);
    filter: contrast(1.1);
}

body.dark-mode .nav-tagline h1 {
    color: var(--dark-text-primary);
    -webkit-text-stroke: 0.8px rgba(255, 255, 255, 0.4);
    text-stroke: 0.8px rgba(255, 255, 255, 0.4);
    filter: contrast(1.15) brightness(1.05);
}

/* Navigation Links */
nav ul {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
    margin: 0;
    padding: 0;
    flex-shrink: 0;
}

nav a {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-text);
    text-decoration: none;
    position: relative;
    padding: 0.5rem 0;
    transition: color 250ms ease;
    white-space: nowrap;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 300ms ease;
}

nav a:hover {
    color: var(--color-accent);
}

nav a:hover::after {
    width: 100%;
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1.5px solid rgba(0, 0, 0, 0.12);
    color: var(--color-text);
    cursor: pointer;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    transition: all 250ms ease;
    letter-spacing: 0.02em;
    margin-left: 1rem;
}

.theme-toggle:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.25);
}

.theme-toggle:active {
    transform: translateY(0);
}

/* Dark Mode Styles - match background color */
body.dark-mode nav {
    background: var(--dark-bg-primary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

body.dark-mode nav a {
    color: rgba(255, 255, 255, 0.8);
}

body.dark-mode nav a:hover {
    color: var(--dark-accent);
}

body.dark-mode nav a::after {
    background: var(--dark-accent);
}

body.dark-mode .theme-toggle {
    border-color: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.9);
}

body.dark-mode .theme-toggle:hover {
    background: rgba(255, 107, 53, 0.12);
    border-color: var(--dark-accent);
    color: var(--dark-accent);
    box-shadow: 0 4px 20px rgba(255, 107, 53, 0.3);
}

/* Responsive Design */
@media (max-width: 1024px) {
    nav .container {
        gap: 1.5rem;
    }
    
    nav ul {
        gap: 1.5rem;
    }
    
    .logo-image {
        height: 65px;
    }
    
    .nav-tagline h1 {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    nav {
        padding: 1rem 1.5rem;
    }
    
    nav .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .logo-container {
        order: 1;
    }
    
    .nav-tagline {
        order: 2;
        padding: 0.5rem 0;
    }
    
    .nav-tagline h1 {
        font-size: 0.9rem;
    }
    
    nav ul {
        order: 3;
        gap: 1.25rem;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    nav a {
        font-size: 0.85rem;
        padding: 0.4rem 0;
    }
    
    .theme-toggle {
        align-self: center;
        font-size: 0.85rem;
        padding: 0.4rem 0.9rem;
        margin-left: 0;
        order: 4;
    }
    
    .logo-image {
        height: 50px;
    }
}

@media (max-width: 480px) {
    nav {
        padding: 0.5rem 1rem;
    }
    nav .container {
        flex-direction: row;
        gap: 0.5rem;
    }
    .logo-image {
        height: 36px;
    }
    .nav-tagline {
        display: none;
    }
    nav ul {
        gap: 0.75rem;
    }
    nav a {
        font-size: 0.8rem;
        padding: 0.3rem 0;
    }
    .theme-toggle {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
}