/* ==========================================================================
   LAYOUT
   The page frame shared by every page: header + navigation, menu dialog,
   page header, section scaffolding, footer.
   ========================================================================== */

/* --- Site header -----------------------------------------------------------
   Sticky, translucent cream. A hairline appears once the page scrolls
   (.is-scrolled, set by main.js). */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid transparent;
    background: rgba(241, 242, 235, 0.88);
    -webkit-backdrop-filter: saturate(1.4) blur(14px);
    backdrop-filter: saturate(1.4) blur(14px);
    transition: border-color var(--duration) ease;
}

.site-header.is-scrolled {
    border-bottom-color: var(--color-line);
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    height: var(--header-height);
}

.site-header__logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    line-height: 1;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    white-space: nowrap;
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
}

@media (max-width: 359px) {
    .site-header__logo { font-size: 1.0625rem; }
    .site-header__actions .btn { padding-inline: 0.875rem; }
}

@media (min-width: 900px) {
    .site-header__logo { font-size: 1.5rem; }
    .site-header .site-header__menu-button { display: none; }  /* beats .icon-btn from components.css */
}

/* --- Main navigation (from 900px) ------------------------------------------ */
.site-nav {
    display: none;
}

@media (min-width: 900px) {
    .site-nav {
        display: block;
        margin-inline: auto;
    }
}

.site-nav__list {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.2vw, 2.25rem);
}

.site-nav__item {
    position: relative;
}

.site-nav__link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0;
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    background-image: linear-gradient(currentColor, currentColor);
    background-position: 0 100%;
    background-repeat: no-repeat;
    background-size: 0 1.5px;
    transition: background-size var(--duration) var(--ease-out);
}

.site-nav__link:hover,
.site-nav__link[aria-current='page'] {
    background-size: 100% 1.5px;
}

.site-nav__chevron {
    width: 1rem;
    height: 1rem;
    transition: transform var(--duration-fast) ease;
}

/* "Projekte" dropdown: opens on hover, or on click/Enter (aria-expanded via main.js). */
.site-nav__menu {
    position: absolute;
    top: calc(100% + 0.75rem);
    left: 50%;
    z-index: 10;
    display: grid;
    gap: 0.125rem;
    min-width: 22rem;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    background: var(--white);
    box-shadow: 0 0 0 1px var(--color-line), 0 24px 48px -24px rgba(36, 36, 36, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, -0.375rem);
    transition: opacity var(--duration-fast) ease, transform var(--duration-fast) ease, visibility var(--duration-fast);
}

/* Invisible bridge, so the pointer can travel from the button to the menu. */
.site-nav__menu::before {
    content: '';
    position: absolute;
    inset: -0.75rem 0 100%;
}

.site-nav__item--menu:hover .site-nav__menu,
.site-nav__link[aria-expanded='true'] + .site-nav__menu {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}

.site-nav__item--menu:hover .site-nav__chevron,
.site-nav__link[aria-expanded='true'] .site-nav__chevron {
    transform: rotate(180deg);
}

.site-nav__menu-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: var(--text-small);
    font-weight: 700;
    transition: background-color var(--duration-fast) ease;
}

.site-nav__menu-link:hover,
.site-nav__menu-link[aria-current='page'] {
    background: var(--color-bg);
}

.site-nav__tag {
    flex: none;
    padding: 0.2rem 0.55rem;
    border: 1px solid var(--color-line-strong);
    border-radius: var(--radius-pill);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

/* --- Menu dialog (below 900px) ----------------------------------------------
   A native <dialog>: focus stays inside, Escape closes it. */
.mobile-menu {
    position: fixed;
    inset: 0;
    width: 100%;
    max-width: none;
    height: 100%;
    max-height: none;
    border: 0;
    background: var(--color-bg);
    color: var(--color-text);
}

.mobile-menu[open] {
    display: flex;
    flex-direction: column;
    animation: menu-in var(--duration) var(--ease-out);
}

.mobile-menu::backdrop {
    background: transparent;
}

@keyframes menu-in {
    from { opacity: 0; transform: translateY(-0.75rem); }
}

.mobile-menu__bar {
    display: flex;
    flex: none;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.mobile-menu__body {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 1rem;
    padding-block: 1.5rem 2rem;
    overflow-y: auto;
}

.mobile-menu__projects {
    display: grid;
}

.mobile-menu__project {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 0.625rem;
    border-bottom: 1px solid var(--color-line);
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 1.2rem + 3vw, 2.5rem);
    line-height: 1.1;
    text-transform: uppercase;
}

.mobile-menu__project[aria-current='page'] {
    color: var(--color-accent-text);
}

.mobile-menu__links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    padding-top: 0.5rem;
}

.mobile-menu__link {
    font-size: var(--text-lead);
    font-weight: 700;
}

.mobile-menu__footer {
    display: grid;
    gap: 1.25rem;
    margin-top: auto;
    padding-top: 1.5rem;
}

.mobile-menu__legal {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    font-size: var(--text-small);
    color: var(--color-text-muted);
}

/* --- Page header of subpages ----------------------------------------------- */
.page-hero {
    padding-block: clamp(2.5rem, 1.2rem + 5vw, 6rem) clamp(2.5rem, 1.5rem + 3.5vw, 5rem);
}

.page-hero__label {
    margin-bottom: clamp(0.75rem, 0.5rem + 1vw, 1.5rem);
}

.page-hero__title {
    font-size: var(--text-display-xl);
}

.page-hero__lead {
    max-width: 50ch;
    margin-top: clamp(1.25rem, 1rem + 1vw, 2rem);
    font-size: var(--text-lead);
}

.page-hero--compact .page-hero__lead {
    color: var(--color-text-muted);
}

/* --- Sections -------------------------------------------------------------- */
.section {
    padding-block: var(--space-section);
}

.section--flush-top {
    padding-top: 0;
}

.section-head {
    max-width: 52rem;
    margin-bottom: clamp(2rem, 1.4rem + 2.4vw, 3.5rem);
}

.section-head .label {
    margin-bottom: 1rem;
}

.section-head__title {
    font-size: var(--text-display-lg);
}

.section-head__intro {
    max-width: 48ch;
    margin-top: 1.25rem;
    font-size: var(--text-lead);
    color: var(--color-text-muted);
}

/* Title left, intro right on wide screens. */
@media (min-width: 900px) {
    .section-head--split {
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
        gap: 3rem;
        max-width: none;
    }

    .section-head--split .section-head__intro {
        margin-top: 0;
    }
}

/* --- Site footer ------------------------------------------------------------ */
.site-footer {
    padding-block: clamp(2.5rem, 2rem + 2.5vw, 4rem) 2rem;
    border-top: 1px solid var(--color-line);
    font-size: var(--text-small);
}

.site-footer__claim {
    margin-bottom: clamp(2rem, 1.5rem + 2vw, 3.5rem);
    font-family: var(--font-display);
    font-size: var(--text-display-md);
    line-height: var(--leading-display);
    text-transform: uppercase;
    text-wrap: balance;
}

.site-footer__grid {
    display: grid;
    gap: 2.5rem;
}

@media (min-width: 900px) {
    .site-footer__grid {
        grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
        gap: 4rem;
    }
}

.site-footer__name {
    margin-bottom: 0.75rem;
    font-weight: 800;
}

.site-footer__text {
    max-width: 40ch;
    color: var(--color-text-muted);
}

.site-footer__nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem 1.5rem;
}

@media (min-width: 600px) {
    .site-footer__nav {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

.site-footer__title {
    margin-bottom: 0.875rem;
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: var(--tracking-label);
    color: var(--color-text-muted);
}

.site-footer__col ul {
    display: grid;
    gap: 0.5rem;
}

.site-footer__link {
    font-weight: 600;
    transition: color var(--duration-fast) ease;
}

.site-footer__link:hover {
    color: var(--color-accent-text);
}

.site-footer__bottom {
    margin-top: clamp(3rem, 2rem + 3vw, 5rem);
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-line);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}