header {
        padding: 18px 16px 8px;
        border-bottom: 1px solid var(--border);
    }

.header-inner {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

h1 {
    margin: 0 0 4px;
    font-size: 26px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

h2 {
    margin: 0;
    font-size: 13px;
    font-weight: 400;
    color: var(--sub);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 12px;
    color: var(--sub);
}

.toggle-track {
    width: 42px;
    height: 22px;
    border-radius: 50px;
    background: var(--toggle-bg);
    position: relative;
}

.toggle-knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--toggle-knob);
    border-radius: 50%;
    transition: transform .2s ease;
}