/* ==========================================================================
   base.css — Single-Source-Fundament fuer alle Seiten
   --------------------------------------------------------------------------
   Enthaelt das, was JEDE Seite teilt: Design-Tokens (Corporate Design),
   Reset, Basis-Typografie, Container, Navigation, Buttons, Section-Header,
   Footer, WhatsApp-FAB, Sticky-Mobil-CTA und die fade-up-Animation.

   Diese Datei ist die EINZIGE Quelle fuer diese Bausteine — Seiten binden sie
   als erstes CSS ein (vor leistungen.css und vor dem seiteneigenen <style>).
   Seiten-spezifisches CSS (Hero, einzelne Sektionen) bleibt im jeweiligen
   <style>-Block der Seite bzw. in assets/css/<seite>.css.

   Farbwerte sind kanonisch abgeleitet aus:
     Business Development/areas/brand/corporate_design.md
   Aendern sich Markenfarben, wird NUR hier editiert.
   ========================================================================== */

/* ===== RESET ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/* ===== DESIGN TOKENS ===== */
:root {
    /* Markenpalette (kanonisch — corporate_design.md) */
    --schild-blau: #2B5EA7;   /* Primaer — Headlines, Buttons, Akzente */
    --dunkelblau:  #1B2A4A;   /* Hintergruende (dunkel), Text auf hell */
    --logo-gruen:  #3D8C3E;   /* Akzent — Checkmarks, Erfolg (sparsam) */
    --silber:      #D4D8DC;   /* Trennlinien, dezente Flaechen */
    --hellgrau:    #F5F7FA;   /* Sektions-Hintergrund, Karten */
    --weiss:       #FFFFFF;
    --cyan-akzent: #00D4FF;   /* Tech-Akzent (sparsam) */

    /* Funktional / abgeleitet */
    --schild-blau-hover: #234D8C;   /* Button-/Link-Hover */
    --dunkelblau-mid:    #162240;   /* Verlaufs-Mitte (Hero/CTA) */
    --dunkelblau-deep:   #0F1C33;   /* Footer-Hintergrund */
    --blau-tint:         #1A3055;   /* Verlaufs-Akzent (Hero) */
    --text-body:         #334155;   /* Fliesstext dunkel */
    --text-light:        #64748B;   /* Sekundaertext */
    --whatsapp-gruen:    #25D366;   /* NUR WhatsApp-FAB */
}

/* ===== BASIS-ELEMENTE ===== */
html { scroll-behavior: smooth; }

body {
    font-family: 'Open Sans', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--dunkelblau);
    background: var(--weiss);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; }

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== NAVIGATION ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--silber);
    transition: box-shadow 0.3s;
}

.nav.scrolled { box-shadow: 0 2px 20px rgba(27, 42, 74, 0.08); }

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo img { height: 40px; width: auto; }

.nav-logo span {
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--dunkelblau);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-body);
    transition: color 0.2s;
    letter-spacing: 0.02em;
}

.nav-links a:hover,
.nav-links a.active { color: var(--schild-blau); }

.nav-cta {
    background: var(--schild-blau);
    color: var(--weiss) !important;
    padding: 10px 24px;
    border-radius: 6px;
    transition: background 0.2s, transform 0.2s;
}

.nav-cta:hover {
    background: var(--schild-blau-hover);
    transform: translateY(-1px);
}

/* Mobile-Menue-Toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--dunkelblau); margin: 6px 0; transition: 0.3s; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.25s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--schild-blau);
    color: var(--weiss);
}

.btn-primary:hover {
    background: var(--schild-blau-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(43, 94, 167, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--weiss);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    border-color: var(--weiss);
    background: rgba(255, 255, 255, 0.05);
}

/* ===== SECTION-HEADER (geteiltes Abschnitts-Kopf-Muster) ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--schild-blau);
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    color: var(--dunkelblau);
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-light);
    font-size: 1.05rem;
    max-width: 560px;
    margin: 0 auto;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--dunkelblau-deep);
    color: rgba(255, 255, 255, 0.5);
    padding: 48px 0 32px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-logo img { height: 32px; opacity: 0.7; }
.footer-logo span { font-family: 'Montserrat', Arial, sans-serif; font-weight: 600; font-size: 0.9rem; }

.footer-links {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
    list-style: none;
}

.footer-links a {
    font-size: 0.85rem;
    transition: color 0.2s;
}

.footer-links a:hover { color: rgba(255, 255, 255, 0.8); }

.footer-copy {
    width: 100%;
    text-align: center;
    padding-top: 32px;
    margin-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.8rem;
}

/* ===== WHATSAPP FLOATING BUTTON ===== */
.wa-fab {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 90;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--whatsapp-gruen);
    color: var(--weiss);
    padding: 14px 22px 14px 18px;
    border-radius: 50px;
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 600;
    font-size: 0.92rem;
    box-shadow: 0 8px 24px rgba(37, 211, 102, 0.4);
    transition: transform 0.25s, box-shadow 0.25s;
}

.wa-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(37, 211, 102, 0.5);
}

.wa-fab svg { flex-shrink: 0; }

/* ===== STICKY MOBIL-CTA ===== */
.sticky-cta {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    display: none;
    background: var(--schild-blau);
    box-shadow: 0 -4px 16px rgba(27, 42, 74, 0.2);
    padding: 9px 14px;
}

.sticky-cta a {
    display: block;
    text-align: center;
    color: var(--weiss);
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.14);
}

/* ===== ANIMATIONS ===== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== RESPONSIVE (geteilte Bausteine) ===== */
@media (max-width: 760px) {
    .sticky-cta.show { display: block; }
    body.sticky-active .wa-fab { bottom: 88px; }
}

@media (max-width: 680px) {
    .nav-links { display: none; }
    .nav-toggle { display: block; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--weiss);
        padding: 24px;
        border-bottom: 1px solid var(--silber);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    }
    .wa-fab { padding: 14px; right: 16px; bottom: 16px; }
    .wa-fab .wa-label { display: none; }
}