header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(249, 250, 251, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 18px;
}

.logo-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--yellow), var(--red));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #111;
    font-weight: 900;
}

nav {
    display: flex;
    gap: 28px;
}

nav a {
    font-size: 15px;
    color: var(--muted);
    position: relative;
    padding-bottom: 4px;
}

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

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--yellow), var(--red));
    transition: width 0.2s ease;
}

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