.portal-shell {
    width: min(1240px, calc(100% - 2rem));
    margin-inline: auto;
}

.portal-header {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--ui-color-border);
    background: color-mix(in srgb, var(--ui-color-surface) 94%, transparent);
    backdrop-filter: blur(14px);
}

.portal-header__inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.portal-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--ui-color-ink);
    text-decoration: none;
}

.portal-brand__mark {
    color: var(--ui-color-brand-text);
    font-size: 1.1rem;
    font-weight: 900;
    letter-spacing: 0.02em;
}

.portal-brand__copy {
    display: grid;
    line-height: 1.05;
}

.portal-brand__copy strong {
    font-size: 1rem;
}

.portal-brand__copy small {
    margin-top: 0.15rem;
    color: var(--ui-color-muted);
    font-size: 0.72rem;
    font-weight: 700;
}

.portal-header__actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.portal-theme {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    border: 1px solid var(--ui-color-border);
    border-radius: 999px;
    background: var(--ui-color-surface-muted);
    padding: 0.2rem;
}

.portal-theme__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.portal-theme button {
    min-height: 34px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--ui-color-muted);
    cursor: pointer;
    padding: 0.35rem 0.65rem;
    font-size: 0.78rem;
    font-weight: 800;
}

.portal-theme button:hover {
    background: var(--ui-color-surface-hover);
    color: var(--ui-color-ink);
}

.portal-theme button[aria-pressed="true"] {
    background: var(--ui-color-surface);
    color: var(--ui-color-ink);
    box-shadow: var(--ui-shadow-sm);
}

.portal-body {
    padding-block: 1.5rem 3.5rem;
}

.portal-main {
    width: min(100%, 1040px);
    min-width: 0;
    margin-inline: auto;
}

.portal-main > * + * {
    margin-top: 1.1rem;
}

.portal-page-header {
    margin-bottom: 1.25rem;
}

.portal-page-header__eyebrow {
    margin: 0 0 0.4rem;
    color: var(--ui-color-brand-text);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.portal-page-header h1 {
    max-width: 850px;
    margin: 0;
    color: var(--ui-color-ink);
    font-size: clamp(2.1rem, 5vw, 4rem);
    line-height: 1;
    letter-spacing: -0.04em;
}

.portal-page-header h2 {
    margin: 0;
    color: var(--ui-color-ink);
    font-size: clamp(1.6rem, 3vw, 2.5rem);
    line-height: 1.08;
    letter-spacing: -0.025em;
}

.portal-page-header p {
    max-width: 760px;
    margin: 0.8rem 0 0;
    color: var(--ui-color-muted);
    font-size: clamp(1rem, 1.8vw, 1.15rem);
}

.portal-footer {
    border-top: 1px solid var(--ui-color-border);
    color: var(--ui-color-muted);
    padding-block: 1.2rem 1.5rem;
    font-size: 0.82rem;
}

.portal-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

@media (max-width: 900px) {
    .portal-header {
        position: static;
    }

    .portal-body {
        padding-top: 1rem;
    }
}

@media (max-width: 700px) {
    .portal-shell {
        width: min(100% - 1.2rem, 1240px);
    }

    .portal-footer__inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .portal-theme {
        max-width: 100%;
        overflow-x: auto;
    }

    .portal-theme button {
        min-height: 40px;
    }
}