/* ==========================================================================
   CSS Architecture - Scheller IT Consulting
   Theme: Professional, Technical, Restrained
   ========================================================================== */

:root {
    /* Colors - Deliberate cool slate theme */
    --c-primary: #0f3d61;
    --c-primary-hover: #0a2942;
    --c-primary-light: #e5edf5;
    
    --c-bg-main: #ffffff;
    --c-bg-alt: #f8fafc;
    --c-bg-card: #ffffff;
    
    --c-text-main: #0f172a;
    --c-text-muted: #475569;
    --c-text-light: #94a3b8;
    
    --c-border: #e2e8f0;
    --c-border-hover: #cbd5e1;
    
    /* Typography */
    --font-sans: 'DM Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
    
    /* Spacing */
    --s-xs: 0.5rem;
    --s-sm: 1rem;
    --s-md: 2rem;
    --s-lg: 4rem;
    --s-xl: 6rem;
    --s-xxl: 8rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 12px;
    
    /* Shadows & Transitions */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.25s ease-in-out;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--c-text-main);
    background-color: var(--c-bg-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1 0 auto;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.content-illustration {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--c-border);
    width: 100%;
    height: auto;
    display: block;
    background-color: var(--c-bg-card);
}

button, input, textarea {
    font: inherit;
    color: inherit;
    border: none;
    background: none;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    color: var(--c-text-main);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3rem); margin-bottom: var(--s-sm); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); margin-bottom: var(--s-sm); }
h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: var(--s-xs); letter-spacing: -0.01em; }
h4 { font-size: 1.125rem; font-weight: 600; margin-bottom: var(--s-xs); }

p {
    margin-bottom: var(--s-sm);
    max-width: 75ch;
}

.lead-text {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--c-text-muted);
    line-height: 1.6;
    max-width: 70ch;
}

.overline-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--c-primary);
    margin-bottom: var(--s-sm);
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--s-md);
}

.container-sm {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--s-md);
}

.section {
    padding: var(--s-lg) 0;
}

@media (min-width: 768px) {
    .section { padding: var(--s-xl) 0; }
}

.section-alt {
    background-color: var(--c-bg-alt);
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
}

.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }
.mt-sm { margin-top: var(--s-sm); }
.mt-md { margin-top: var(--s-md); }
.mt-lg { margin-top: var(--s-lg); }
.mb-xs { margin-bottom: var(--s-xs); }
.mb-sm { margin-bottom: var(--s-sm); }
.mb-md { margin-bottom: var(--s-md); }
.mb-lg { margin-bottom: var(--s-lg); }

.grid {
    display: grid;
    gap: var(--s-md);
}

.grid-2 { grid-template-columns: 1fr; }
@media (min-width: 768px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

.grid-3 { grid-template-columns: 1fr; }
@media (min-width: 768px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.span-2 { grid-column: span 1; }
@media (min-width: 768px) {
    .span-2 { grid-column: span 2; }
}

.span-3 { grid-column: span 1; }
@media (min-width: 1024px) {
    .span-3 { grid-column: span 3; }
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    line-height: 1;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-primary {
    background-color: var(--c-primary);
    color: #FFF;
    border: 1px solid var(--c-primary);
}

.btn-primary:hover, .btn-primary:focus-visible {
    background-color: var(--c-primary-hover);
    border-color: var(--c-primary-hover);
    color: #FFF;
}

.btn-secondary {
    background-color: transparent;
    color: var(--c-primary);
    border: 1px solid var(--c-primary);
}

.btn-secondary:hover, .btn-secondary:focus-visible {
    background-color: var(--c-primary-light);
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
    color: var(--c-primary);
}

.link-arrow .arrow {
    margin-left: 0.25rem;
    transition: transform var(--transition-fast);
}

.link-arrow:hover .arrow {
    transform: translateX(4px);
}

/* Cards */
.card {
    background-color: var(--c-bg-card);
    border: 1px solid var(--c-border);
    padding: var(--s-md);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    border-color: var(--c-border-hover);
    box-shadow: var(--shadow-sm);
}

.card-title {
    font-size: 1.125rem;
    margin-bottom: var(--s-xs);
}

.card-desc {
    color: var(--c-text-muted);
    margin-bottom: var(--s-md);
    flex-grow: 1;
    font-size: 0.9375rem;
}

.card-footer {
    margin-top: auto;
}

/* Lists */
.check-list {
    display: grid;
    gap: 0.75rem;
    margin-bottom: var(--s-md);
}

@media (min-width: 640px) {
    .check-list-2col {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
}

.check-list li {
    position: relative;
    padding-left: 1.75rem;
    color: var(--c-text-main);
    line-height: 1.5;
}

.check-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.25rem;
    width: 18px;
    height: 18px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230f3d61' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

/* Process Items */
.process-list {
    display: flex;
    flex-direction: column;
    gap: var(--s-lg);
}

.process-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--s-md);
    align-items: flex-start;
}

.process-number {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 500;
    color: var(--c-primary);
    background: var(--c-primary-light);
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* Prose for content heavy pages */
.prose {
    max-width: 70ch;
}
.prose h2 { margin-top: var(--s-lg); }
.prose h3 { margin-top: var(--s-md); }
.prose p { color: var(--c-text-muted); font-size: 1.0625rem; }

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    background-color: var(--c-bg-card);
    border-bottom: 1px solid var(--c-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.site-logo {
    display: flex;
    align-items: center;
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
}

.logo-img {
    display: block;
    height: 36px;
    width: auto;
}

.site-nav {
    display: none;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--s-md);
}

.nav-link {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--c-text-muted);
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.is-active {
    color: var(--c-text-main);
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-family: var(--font-mono, monospace);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
}

.lang-switch-link {
    color: var(--c-text-muted);
    padding: 0.25rem 0.125rem;
    transition: color var(--transition-fast);
}

.lang-switch-link + .lang-switch-link {
    border-left: 1px solid var(--c-border);
    padding-left: 0.5rem;
}

.lang-switch-link:hover {
    color: var(--c-text-main);
}

.lang-switch-link.is-active {
    color: var(--c-text-main);
    font-weight: 600;
}

.mobile-menu-toggle {
    display: block;
    padding: 0.5rem;
    cursor: pointer;
    z-index: 101;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--c-text-main);
    position: relative;
    transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--c-text-main);
    left: 0;
    transition: transform var(--transition-fast);
}

.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

.mobile-menu-toggle.is-active .hamburger { background-color: transparent; }
.mobile-menu-toggle.is-active .hamburger::before { transform: translateY(6px) rotate(45deg); }
.mobile-menu-toggle.is-active .hamburger::after { transform: translateY(-6px) rotate(-45deg); }

@media (min-width: 768px) {
    .site-nav { display: block; }
    .mobile-menu-toggle { display: none; }
}

@media (max-width: 767px) {
    .site-nav.is-open {
        display: block;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background-color: var(--c-bg-card);
        padding: var(--s-md);
        overflow-y: auto;
    }
    
    .site-nav.is-open .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--s-sm);
    }
    
    .site-nav.is-open .nav-link {
        font-size: 1.125rem;
        display: block;
        width: 100%;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--c-border);
    }

    .site-nav.is-open .lang-switch {
        padding-top: 0.75rem;
        font-size: 0.875rem;
    }
    
    body.no-scroll { overflow: hidden; }
}

/* ==========================================================================
   Hero Areas & Page Headers
   ========================================================================== */
.hero-home {
    padding: calc(var(--s-xl) + 2rem) 0 var(--s-xl);
    background-color: var(--c-bg-card);
    border-bottom: 1px solid var(--c-border);
}

.hero-content {
    max-width: 800px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--s-sm);
    margin-top: var(--s-md);
}

.page-header {
    padding: var(--s-lg) 0 var(--s-md);
    background-color: var(--c-bg-main);
}

.page-header-title {
    max-width: 800px;
}

/* ==========================================================================
   Content Blocks (Two Column layouts)
   ========================================================================== */
.content-block {
    display: grid;
    gap: var(--s-lg);
}

@media (min-width: 768px) {
    .content-block {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
    .content-block-sticky {
        position: sticky;
        top: 100px;
    }
}

.content-block-header h2 {
    margin-bottom: var(--s-sm);
}

.content-block-body p {
    color: var(--c-text-muted);
}

/* Callout / Banner */
/* Component variants */
.content-block--center { align-items: center; }
.card--flat { background-color: var(--c-bg-main); }
.card--accent { border-left: 3px solid var(--c-primary); background-color: var(--c-bg-main); }
.card--emphasis { color: var(--c-text-main); font-weight: 500; font-size: 1.0625rem; }
.card-title-tight { margin-bottom: var(--s-sm); }
.callout--card { background-color: var(--c-bg-card); }
.callout--main { background-color: var(--c-bg-main); }

.callout {
    background-color: var(--c-bg-alt);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    padding: var(--s-lg);
    text-align: center;
}

.callout h2 {
    margin-bottom: var(--s-sm);
}

.callout p {
    margin-inline: auto;
    color: var(--c-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background-color: var(--c-bg-alt);
    border-top: 1px solid var(--c-border);
    padding: var(--s-xl) 0 var(--s-md);
    margin-top: auto;
}

.footer-grid {
    display: grid;
    gap: var(--s-lg);
    grid-template-columns: 1fr;
    margin-bottom: var(--s-lg);
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer-brand {
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    color: var(--c-text-main);
    display: block;
    margin-bottom: var(--s-sm);
}

.footer-desc {
    color: var(--c-text-muted);
    font-size: 0.875rem;
    max-width: 300px;
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--s-sm);
    color: var(--c-text-main);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: var(--c-text-muted);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--c-primary);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: var(--s-md);
    border-top: 1px solid var(--c-border);
    color: var(--c-text-muted);
    font-size: 0.875rem;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

/* Utilities */
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.gap-xs { gap: var(--s-xs); }
.gap-sm { gap: var(--s-sm); }
.gap-md { gap: var(--s-md); }
.gap-lg { gap: var(--s-lg); }
.h-full { height: 100%; }

/* Contact Visual Image Styling */
.contact-visual-img {
    display: inline-block;
    vertical-align: middle;
    /* Use inversion to make it fit the theme if needed, or leave untouched based on the current image */
    filter: invert(18%) sepia(42%) saturate(1450%) hue-rotate(185deg) brightness(98%) contrast(93%);
}