/* ==========================================================================
   Layout — Treppenidee Redesign
   Mobile-first: base = mobile, media queries in responsive.css
   ========================================================================== */
   
/* ---- Header Container ---- */
.site-header .container {
    max-width: var(--header-container);
    margin: 0 auto;
}

/* ---- Header Container ---- */
.site-footer .container {
    max-width: var(--footer-container);
    margin: 0 auto;
}

/* ---- Container ---- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---- Sections ---- */
.section {
  padding: var(--section-gap) 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

/* ---- Grids (mobile-first: single column) ---- */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* ---- Site Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: transparent;
  transition: background-color var(--transition), box-shadow var(--transition);
}

.header--solid {
  background: var(--color-white);
  box-shadow: var(--shadow);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.site-header__logo {
  display: flex;
  align-items: center;
}

.site-header__logo img {
  height: 4.5rem;
  width: auto;
}

/* Nav — hidden on mobile, shown via responsive.css */
.site-header__nav {
  display: none;
}

.site-header__nav ul {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav a {
  color: inherit;
  text-decoration: none;
  font-weight: 600;
  font-size: var(--font-size-body);
  position: relative;
  transition: color var(--transition);
}

.site-header__nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.site-header__nav a:hover,
.site-header__nav a.active {
  color: var(--color-accent);
}

.site-header__nav a:hover::after,
.site-header__nav a.active::after {
  width: 100%;
}

/* CTA area */
.site-header__cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Phone — hidden on mobile, shown via responsive.css */
.header-phone {
  display: none;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

/* Hamburger — visible on mobile, hidden via responsive.css */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Mobile Menu — full-screen overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-white);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.mobile-menu--open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu a {
  font-size: var(--font-size-h2);
  font-family: var(--font-heading);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

.mobile-menu a:hover {
  color: var(--color-accent);
}

/* ---- Site Footer ---- */
.site-footer {
  background: var(--color-primary-dark);
  color: var(--color-white);
  padding: 4rem 0 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer__col h3,
.footer__col h4 {
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer__col a {
  color: var(--color-white);
  opacity: 0.8;
  text-decoration: none;
  transition: opacity var(--transition);
}

.footer__col a:hover {
  opacity: 1;
}

.footer__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__col li + li {
  margin-top: 0.5rem;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 1.5rem;
  text-align: center;
  font-size: var(--font-size-small);
  opacity: 0.7;
}