/* ============================================================
   CKStudio — Shared Site Stylesheet
   Single source of truth for design tokens, nav, footer,
   buttons and shared page components. Loaded on every page.
   ============================================================ */

:root {
    --paper: #F5F5F8;
    --paper-2: #ECEBF2;
    --card: #FFFFFF;
    --ink: #0C0C0E;
    --ink-2: #33333A;
    --ink-3: #6B6B75;
    --ink-4: #6E6E78;
    --accent: #4B3FD4;
    --line: rgba(12, 12, 14, .13);
    --line-soft: rgba(12, 12, 14, .07);
    --ease: cubic-bezier(.22, 1, .36, 1);

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-full: 100px;

    --shadow-sm: 0 1px 2px rgba(12, 12, 14, .04), 0 8px 24px rgba(12, 12, 14, .05);
    --shadow-lg: 0 1px 2px rgba(12, 12, 14, .04), 0 8px 24px rgba(12, 12, 14, .05), 0 24px 64px rgba(12, 12, 14, .06);

    --fs-0: 0.8125rem;
    --fs-1: clamp(0.9rem, 0.86rem + 0.2vw, 1rem);
    --fs-2: clamp(1rem, 0.95rem + 0.3vw, 1.15rem);
    --fs-3: clamp(1.3rem, 1.15rem + 0.8vw, 1.7rem);
    --fs-4: clamp(1.9rem, 1.4rem + 2.3vw, 3.15rem);
    --fs-5: clamp(2.75rem, 1.6rem + 5vw, 5.75rem);

    --pad: clamp(1.25rem, 5vw, 5.5rem);
    --sect: clamp(5.5rem, 13vh, 10rem);
    --maxw: 1440px;

    /* Legacy aliases (older pages reference these names directly) */
    --bg: var(--paper);
    --surface: var(--card);
    --text: var(--ink);
    --muted: var(--ink-3);
    --shadow: var(--shadow-lg);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Libre Franklin', system-ui, sans-serif;
    font-size: var(--fs-2);
    line-height: 1.65;
    color: var(--ink-3);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(75, 63, 212, .16); color: var(--ink); }

h1, h2, h3 {
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--ink);
    line-height: 1.12;
}

/* Bootstrap ships bolder default weights for these utility classes on the
   older subpages; force them back to the thin editorial look used on index.html. */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6,
.display-1, .display-2, .display-3, .display-4, .display-5, .display-6 {
    font-weight: 400;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
.accent { color: var(--accent); }

.wrap {
    max-width: var(--maxw);
    margin: 0 auto;
    padding-left: var(--pad);
    padding-right: var(--pad);
}

.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link,
.visually-hidden-focusable.position-absolute {
    position: absolute; left: -9999px; top: 0;
    background: var(--ink); color: var(--paper);
    padding: .6rem 1.2rem; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus,
.visually-hidden-focusable.position-absolute:focus { left: 0; }

/* ============ Eyebrow ============ */
.eyebrow {
    display: inline-flex; align-items: center;
    font-size: var(--fs-0);
    text-transform: uppercase;
    letter-spacing: .14em;
    font-weight: 500;
    color: var(--ink-3);
    margin-bottom: 1.4rem;
}

/* ============ Buttons ============ */
.btn,
.btn-minimal, .btn-minimal-outline {
    display: inline-flex; align-items: center; justify-content: center; gap: .6rem;
    font-family: 'Libre Franklin', system-ui, sans-serif;
    font-size: var(--fs-0);
    text-transform: uppercase;
    letter-spacing: .14em;
    font-weight: 500;
    padding: 1.05em 2.1em;
    border-radius: var(--radius-full);
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background .45s var(--ease), color .45s var(--ease), border-color .45s var(--ease), transform .45s var(--ease), box-shadow .45s var(--ease);
}
.btn-solid, .btn-minimal { background: var(--ink); color: var(--paper); box-shadow: 0 14px 28px rgba(12,12,14,.14); }
.btn-solid:hover, .btn-minimal:hover { background: var(--accent); color: #fff; transform: translateY(-1px); }
.btn-ghost, .btn-minimal-outline { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover, .btn-minimal-outline:hover { border-color: var(--ink); transform: translateY(-1px); box-shadow: var(--shadow-sm); }

/* ============ Arrow Link ============ */
.arrow-link {
    display: inline-flex; align-items: center; gap: .5rem;
    font-family: 'Libre Franklin', system-ui, sans-serif;
    font-size: var(--fs-1);
    font-weight: 500;
    color: var(--ink);
    text-decoration: none;
    position: relative;
    padding-bottom: 3px;
}
.arrow-link::after {
    content: "";
    position: absolute; left: 0; bottom: 0;
    width: 100%; height: 1px;
    background: var(--accent);
    transform: scaleX(0); transform-origin: left;
    transition: transform .5s var(--ease);
}
.arrow-link svg { transition: transform .5s var(--ease); flex-shrink: 0; }
.arrow-link:hover { color: var(--accent); }
.arrow-link:hover::after { transform: scaleX(1); }
.arrow-link:hover svg { transform: translateX(5px); }

/* ============ Card / Panel ============ */
.card, .panel {
    background: var(--card);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* ============ Lead copy ============ */
.lead-copy { font-size: var(--fs-2); line-height: 1.65; color: var(--ink-3); }

/* ============ Nav ============ */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(245, 245, 248, 0);
    transition: background .5s var(--ease), border-color .5s var(--ease), backdrop-filter .5s var(--ease);
    border-bottom: 1px solid transparent;
}
.nav.scrolled {
    background: rgba(245, 245, 248, .82);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom-color: var(--line-soft);
}
.nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: 1.1rem; padding-bottom: 1.1rem;
}
.nav-logo, .navbar-brand {
    display: inline-flex; align-items: center; gap: .6rem;
    font-family: 'Libre Franklin', system-ui, sans-serif;
    /* Gleiche Behandlung wie die Navigationslinks: Versalien,
       Gewicht 500, Laufweite .14em - gilt noch fuer die Fusszeile,
       wo "CKStudio e.U." weiterhin ausgeschrieben steht. */
    font-size: 1.05rem; font-weight: 500; line-height: 1;
    text-transform: uppercase; letter-spacing: .14em;
    color: var(--ink); text-decoration: none;
}

/* In der Kopfzeile steht nur noch das Monogramm. Ohne Textbezug wird
   es in Pixeln bemessen und bekommt eine Trefferflaeche von 44 px. */
.nav .nav-logo, .nav .navbar-brand {
    gap: 0;
    min-height: 44px;
    padding-right: .25rem;
}
.nav .nav-mark { height: 26px; }
/* Nur "Studio" traegt den Akzent. Frueher stand hier ".navbar-brand span",
   was seit der Umstellung den umschliessenden Wrapper traf und auf zehn
   Seiten die komplette Wortmarke violett gefaerbt hat. */
.nav-logo em, .navbar-brand em { font-style: normal; font-weight: 600; letter-spacing: inherit; color: var(--accent); }
.nav-mark {
    height: 1.15em; width: auto; flex-shrink: 0;
    transition: transform .6s var(--ease);
}
.nav-logo:hover .nav-mark { transform: rotate(-8deg) scale(1.04); }
@media (prefers-reduced-motion: reduce) { .nav-mark { transition: none; } }
.nav-links {
    display: flex; align-items: center; gap: 2.2rem; list-style: none;
    margin: 0; padding: 0;
}
.nav-links a:not(.btn):not(.btn-minimal) {
    font-size: var(--fs-0);
    text-transform: uppercase; letter-spacing: .14em; font-weight: 500;
    color: var(--ink-2); text-decoration: none;
    transition: color .35s var(--ease);
}
.nav-links a:not(.btn):not(.btn-minimal):hover,
.nav-links a.active:not(.btn):not(.btn-minimal) { color: var(--accent); }
.nav-links .btn, .nav-links .btn-minimal { padding: .8em 1.7em; }

/* ---- Nav-Dropdown (ohne JavaScript) ---- */
.nav-has-sub { position: relative; }
.nav-sub {
    position: absolute; top: 100%; left: 0;
    min-width: 15rem; margin: 0; padding: .9rem 0;
    list-style: none;
    background: var(--paper);
    border: 1px solid rgba(0,0,0,.08);
    border-radius: 6px;
    box-shadow: 0 12px 40px rgba(0,0,0,.10);
    opacity: 0; visibility: hidden;
    transform: translateY(6px);
    transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s;
    z-index: 60;
}
.nav-has-sub:hover > .nav-sub,
.nav-has-sub:focus-within > .nav-sub {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.nav-sub li { margin: 0; padding: 0; }
.nav-sub li::before { content: none; }
.nav-links .nav-sub a:not(.btn):not(.btn-minimal) {
    display: block; padding: .55rem 1.4rem;
    text-transform: none; letter-spacing: .01em;
    font-size: var(--fs-1); white-space: nowrap;
}
.nav-burger {
    display: none; background: none; border: 0; cursor: pointer;
    width: 42px; height: 42px; position: relative; z-index: 5;
}
.nav-burger span {
    position: absolute; left: 9px; right: 9px; height: 1.5px;
    background: var(--ink); transition: transform .45s var(--ease);
}
.nav-burger span:nth-child(1) { top: 18px; }
.nav-burger span:nth-child(2) { top: 26px; }
body.menu-open .nav-burger span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
body.menu-open .nav-burger span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

@media (max-width: 900px) {
    .nav-burger { display: block; position: relative; z-index: 120; }
    /* Wortmarke bleibt beim geoeffneten Menue sichtbar. */
    body.menu-open .nav-logo,
    body.menu-open .navbar-brand { position: relative; z-index: 120; }

    /* Vollflaechiges Menue. Frueher stand hier z-index:-1 - dadurch lag
       das Panel HINTER dem Seiteninhalt und der Text darunter schien
       durch. Jetzt liegt es darueber, unter dem Burger-Button. */
    .nav-links {
        position: fixed; inset: 0;
        z-index: 110;
        display: flex;
        flex-direction: column; align-items: stretch;
        /* "safe center" zentriert nur, solange der Inhalt passt. Bei
           reinem "center" schiebt Flexbox ueberlaufenden Inhalt oben
           aus dem Panel heraus - dort lag der erste Eintrag dann unter
           dem Logo. Aeltere Browser bekommen flex-start. */
        justify-content: flex-start;
        justify-content: safe center;
        gap: 0;
        padding: 6.5rem var(--pad) calc(var(--pad) + 1rem);
        background: var(--paper);
        overflow-y: auto;
        opacity: 0; pointer-events: none;
        transform: translateY(-8px);
        transition: opacity .45s var(--ease), transform .45s var(--ease), visibility .45s;
        visibility: hidden;
    }
    body.menu-open { overflow: hidden; }
    body.menu-open .nav-links {
        opacity: 1; pointer-events: auto; visibility: visible; transform: none;
    }

    /* Jeder Eintrag eine eigene Zeile mit Haarlinie - ruhiger als
       zentrierte Textreihen und mit grosser Trefferflaeche. */
    .nav-links > li { border-bottom: 1px solid var(--line-soft); }
    .nav-links > li:first-child { border-top: 1px solid var(--line-soft); }
    .nav-links > li:last-child { border: 0; padding-top: 1.6rem; }

    .nav-links a:not(.btn):not(.btn-minimal) {
        display: block;
        font-family: 'Libre Franklin', system-ui, sans-serif;
        font-size: 1.05rem; font-weight: 500;
        text-transform: uppercase; letter-spacing: .14em;
        color: var(--ink);
        padding: 1.05rem 0;
        transition: color .4s var(--ease), padding-left .4s var(--ease);
    }
    .nav-links a:not(.btn):not(.btn-minimal):hover,
    .nav-links a:not(.btn):not(.btn-minimal):focus-visible {
        color: var(--accent); padding-left: .5rem;
    }
    .nav-links .btn { width: 100%; }

    .nav-has-sub { text-align: left; }
    .nav-sub {
        position: static; opacity: 1; visibility: visible;
        transform: none; box-shadow: none; border: 0;
        background: transparent; padding: 0 0 .9rem; min-width: 0;
        display: flex; flex-wrap: wrap; gap: .5rem .9rem;
    }
    .nav-links .nav-sub a:not(.btn):not(.btn-minimal) {
        font-family: 'Libre Franklin', system-ui, sans-serif;
        font-size: var(--fs-0); font-weight: 400;
        text-transform: uppercase; letter-spacing: .12em;
        color: var(--ink-3); padding: .3rem 0;
    }
    .nav-links .nav-sub a:hover { color: var(--accent); padding-left: 0; }

    /* Eintraege laufen gestaffelt ein. Standard ist sichtbar; die
       Bewegung kommt nur dazu, wenn der Besucher sie zulaesst. */
    @media (prefers-reduced-motion: no-preference) {
        body.menu-open .nav-links > li {
            animation: nav-in .55s var(--ease) backwards;
        }
        body.menu-open .nav-links > li:nth-child(1) { animation-delay: .06s; }
        body.menu-open .nav-links > li:nth-child(2) { animation-delay: .11s; }
        body.menu-open .nav-links > li:nth-child(3) { animation-delay: .16s; }
        body.menu-open .nav-links > li:nth-child(4) { animation-delay: .21s; }
        body.menu-open .nav-links > li:nth-child(5) { animation-delay: .26s; }
        body.menu-open .nav-links > li:nth-child(6) { animation-delay: .31s; }
    }
    @keyframes nav-in {
        from { opacity: 0; transform: translateY(12px); }
        to   { opacity: 1; transform: none; }
    }
}

/* ============ Page Hero (subpages) ============ */
.page-hero {
    padding: calc(var(--sect) + 2rem) 0 calc(var(--sect) * .5);
    border-bottom: 1px solid var(--line-soft);
}
.breadcrumb-link { font-size: var(--fs-0); color: var(--ink-4); text-decoration: none; }
.breadcrumb-link:hover { color: var(--ink); }

/* ============ Sticky mobile CTA ============ */
.sticky-mobile-cta {
    display: none;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    padding: 0.875rem 1rem;
    background: var(--accent);
    z-index: 1000;
}
@media (max-width: 991px) {
    body { padding-bottom: 4.5rem; }
    .page-hero { padding-top: calc(var(--sect) + 1.2rem); }
    .sticky-mobile-cta { display: block; }
}

/* ============ Footer ============ */
footer { border-top: 1px solid var(--line-soft); background: var(--paper-2); }
.foot-inner {
    display: grid; grid-template-columns: 1.1fr repeat(4, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
    padding-top: clamp(3rem, 7vh, 4.5rem);
    padding-bottom: 2.2rem;
}
.foot-inner .nav-logo { display: inline-block; margin-bottom: .9rem; }
.foot-inner p { font-size: var(--fs-1); max-width: 34ch; color: var(--ink-3); }
.foot-col .k {
    font-size: var(--fs-0); text-transform: uppercase; letter-spacing: .14em;
    font-weight: 500; color: var(--ink-4);
    display: block; margin-bottom: 1rem;
}
.foot-col ul { list-style: none; margin: 0; padding: 0; }
.foot-col li { margin-bottom: .55rem; font-size: var(--fs-1); padding-left: 0; }
.foot-col li::before { content: none; }
.foot-col a, .footer-link { text-decoration: none; color: var(--ink-2); transition: color .35s var(--ease); }
.foot-col a:hover, .footer-link:hover { color: var(--accent); }
.foot-bottom {
    border-top: 1px solid var(--line-soft);
    padding-top: 1.4rem; padding-bottom: 1.6rem;
    display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem;
    font-size: var(--fs-0); color: var(--ink-4);
}
@media (max-width: 900px) { .foot-inner { grid-template-columns: 1fr 1fr; } .foot-inner > div:first-child { grid-column: span 2; } }
@media (max-width: 560px) { .foot-inner { grid-template-columns: 1fr; } .foot-inner > div:first-child { grid-column: span 1; } }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition-duration: .01ms !important; }
}


/* ============================================================
   Seiten-Auftritt
   Kein Preloader: der Inhalt ist von der ersten Sekunde an da.
   Die Bewegung wird nur zugeschaltet, wenn der Besucher sie
   zulaesst - Standard ist der fertige Zustand.

   Wichtig fuer die Ladewerte: das groesste Textelement (die H1)
   wird NICHT eingeblendet, sondern nur minimal angehoben. Ein
   Fade von opacity 0 wuerde den LCP-Zeitpunkt nach hinten
   schieben; eine reine Transform-Bewegung tut das nicht.
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
    /* Auch die Navigation nur anheben: gemessen kostete ein Opacity-Fade
       hier 164 ms First Contentful Paint, weil die Navigation das erste
       gezeichnete Element ist. */
    .nav-inner { animation: ck-auftritt-heben .7s var(--ease) backwards; }

    /* Alles im Hero bewegt sich ausschliesslich per transform. Gemessen:
       ein zusaetzlicher Opacity-Fade hat den LCP auf webagentur-schweiz.html
       von 268 ms auf 1200 ms verschoben, eine reine Transform-Bewegung nicht. */
    .hero h1, .page-hero h1 { animation: ck-auftritt-heben .75s var(--ease) backwards; }
    .hero-side,
    .hero-meta,
    .page-hero .lead-copy   { animation: ck-auftritt-heben .8s var(--ease) .1s backwards; }
    .hero-ctas              { animation: ck-auftritt-heben .8s var(--ease) .18s backwards; }
}
@keyframes ck-auftritt-heben {
    from { transform: translate3d(0, 12px, 0); }
    to   { transform: none; }
}