#header-placeholder {
    width: 100%;
    height: 60px;
}

:root {
    --header-bg: rgba(10, 10, 10, 0.5);
    --header-border: rgba(255, 255, 255, 0.1);
    --nav-link-color: rgba(255, 255, 255, 0.6);
    --nav-link-hover: rgba(255, 255, 255, 1);
    --contact-link-bg: rgba(255, 255, 255, 0.05);
    --contact-link-border: rgba(255, 255, 255, 0.2);
    --contact-link-color: rgba(255, 255, 255, 0.7);
    --contact-link-hover-border: rgba(255, 255, 255, 0.4);
    --text-primary: #fff;
    --text-tertiary: rgba(255, 255, 255, 0.6);
}

.theme-light {
    --header-bg: rgba(250, 250, 250, 0.8);
    --header-border: rgba(0, 0, 0, 0.1);
    --nav-link-color: rgba(0, 0, 0, 0.6);
    --nav-link-hover: rgba(0, 0, 0, 1);
    --contact-link-bg: rgba(0, 0, 0, 0.03);
    --contact-link-border: rgba(0, 0, 0, 0.2);
    --contact-link-color: rgba(0, 0, 0, 0.7);
    --contact-link-hover-border: rgba(0, 0, 0, 0.4);
    --text-primary: #1a1a1a;
    --text-tertiary: rgba(0, 0, 0, 0.6);
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0.8rem 2rem;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--header-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    width: 100%;
    transition: background 0.3s ease, border-color 0.3s ease;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 300;
    margin: 0;
    letter-spacing: -0.5px;
    white-space: nowrap;
}

header h1 a {
    text-decoration: none;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: opacity 0.3s ease;
    display: inline-block;
}

header h1 a:hover {
    opacity: 0.8;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 3rem;
    flex: 1;
    justify-content: flex-end;
}

nav {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.header-contact {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

nav a {
    color: var(--nav-link-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 300;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.3s ease;
    position: relative;
    white-space: nowrap;
}

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

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--text-tertiary);
    transition: width 0.3s ease;
}

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

.contact-link {
    color: var(--contact-link-color);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--contact-link-border);
    border-radius: 6px;
    backdrop-filter: blur(10px);
    white-space: nowrap;
    background: var(--contact-link-bg);
}

.contact-link:hover {
    color: var(--text-primary);
    border-color: var(--contact-link-hover-border);
    transform: translateY(-1px);
}

.contact-link svg {
    display: inline-block;
    vertical-align: middle;
    width: 16px;
    height: 16px;
}


@media (max-width: 768px) {
    #header-placeholder {
        height: 100px;
    }

    header {
        padding: 0.8rem 1.5rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    header h1 {
        font-size: 1.3rem;
    }

    .header-content {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        justify-content: flex-start;
    }

    nav {
        gap: 1.5rem;
    }

    .header-contact {
        gap: 0.8rem;
        width: 100%;
        justify-content: flex-start;
    }

    .contact-link {
        font-size: 0.8rem;
        padding: 0.35rem 0.7rem;
    }
}