/* ============================================
   Reset & Base Styles
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Dark theme with white accents */
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-50: #1a1a1a;
    --color-gray-100: #2a2a2a;
    --color-gray-200: #3a3a3a;
    --color-gray-300: #4a4a4a;
    --color-gray-400: #6a6a6a;
    --color-gray-500: #8a8a8a;
    --color-gray-600: #aaaaaa;
    --color-gray-700: #cccccc;
    --color-gray-800: #e0e0e0;
    --color-gray-900: #f5f5f5;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-white);
    background-color: var(--color-black);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
}

h4 {
    font-size: 1.125rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-600);
}

a {
    color: var(--color-white);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-gray-400);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-gray-600);
}

strong {
    font-weight: 600;
    color: var(--color-white);
}

/* ============================================
   Container
   ============================================ */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    position: sticky;
    top: 0;
    background-color: rgba(0, 0, 0, 0.95);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--container-padding);
    min-height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-white);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-list a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--color-white);
}

.btn-nav {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--color-white);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-nav:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-white);
    transition: all var(--transition-fast);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border: 1px solid var(--color-white);
    background-color: var(--color-black);
    color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    border-radius: var(--radius-md);
}

.btn-primary {
    background-color: var(--color-white);
    color: var(--color-black);
}

.btn-primary:hover {
    background-color: var(--color-gray-800);
    color: var(--color-white);
    border-color: var(--color-gray-800);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-secondary:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-100);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-headline {
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    font-weight: 700;
}

.hero-subheadline {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--color-gray-500);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

/* ============================================
   Page Hero
   ============================================ */

.page-hero {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    text-align: center;
}

.page-headline {
    margin-bottom: var(--spacing-md);
}

.page-intro {
    font-size: 1.125rem;
    color: var(--color-gray-500);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   Sections
   ============================================ */

.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background-color: var(--color-gray-50);
}

.section-headline {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-gray-500);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.text-center {
    text-align: center;
}

/* ============================================
   Vorteile Grid
   ============================================ */

.vorteile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.vorteil-card {
    text-align: center;
}

.vorteil-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.vorteil-card {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.vorteil-card p {
    color: var(--color-gray-500);
    font-size: 0.9375rem;
}

/* ============================================
   Target Grid
   ============================================ */

.target-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.target-item h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.target-item {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.target-item p {
    color: var(--color-gray-500);
}

/* ============================================
   Process Grid
   ============================================ */

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.process-step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    color: var(--color-black);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
    border-radius: var(--radius-full);
}

.process-step h3 {
    margin-bottom: var(--spacing-sm);
}

.process-step {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.process-step p {
    color: var(--color-gray-500);
}

/* ============================================
   Projects Preview
   ============================================ */

.projects-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.project-card {
    padding: var(--spacing-xl);
    background-color: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.project-card:hover {
    border-color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.project-card h3 {
    margin-bottom: var(--spacing-sm);
}

.project-card p {
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-md);
}

.link-arrow {
    font-weight: 500;
    color: var(--color-white);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.link-arrow:hover {
    color: var(--color-gray-400);
}

/* ============================================
   Service Detail
   ============================================ */

.service-detail {
    max-width: 800px;
    margin: 0 auto;
}

.service-content h2 {
    margin-bottom: var(--spacing-sm);
}

.service-intro {
    font-size: 1.125rem;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xl);
}

.service-benefits,
.service-features {
    margin-bottom: var(--spacing-xl);
}

.service-benefits h3,
.service-features h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.service-benefits ul,
.service-features ul {
    list-style: none;
    padding-left: 0;
}

.service-benefits li,
.service-features li {
    padding-left: var(--spacing-lg);
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.service-benefits li::before,
.service-features li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-white);
    font-weight: 700;
}

/* ============================================
   Project Case
   ============================================ */

.project-case {
    max-width: 900px;
    margin: 0 auto var(--spacing-3xl);
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
}

.project-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-gray-100);
    color: var(--color-gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
}

.project-section {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.project-section h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.project-section p {
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* ============================================
   About Content
   ============================================ */

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.about-text h2:first-child {
    margin-top: 0;
}

.about-text ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--spacing-xl);
}

.about-text li {
    padding-left: var(--spacing-lg);
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.about-text li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-white);
    font-weight: 700;
}

/* ============================================
   Qualifications
   ============================================ */

.qual-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.qual-item h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.qual-item {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.qual-item p {
    color: var(--color-gray-500);
}

/* ============================================
   Contact
   ============================================ */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-form-wrapper h2,
.contact-info h2 {
    margin-bottom: var(--spacing-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-white);
    font-size: 0.9375rem;
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-gray-300);
    background-color: var(--color-gray-50);
    color: var(--color-white);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-white);
    background-color: var(--color-gray-100);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-500);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-label {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 4px;
    cursor: pointer;
}

.checkbox-label span {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    line-height: 1.5;
}

.checkbox-label a {
    color: var(--color-white);
    text-decoration: underline;
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    display: none;
}

.form-message.success {
    display: block;
    background-color: var(--color-gray-100);
    color: var(--color-white);
    border: 1px solid var(--color-gray-300);
}

.form-message.error {
    display: block;
    background-color: #4a1a1a;
    color: #ff6b6b;
    border: 1px solid #ff4444;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.contact-item h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
    font-weight: 600;
}

.contact-item {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.contact-item p {
    color: var(--color-gray-500);
    margin-bottom: 0;
}

.contact-item a {
    color: var(--color-gray-500);
    text-decoration: underline;
}

.contact-item a:hover {
    color: var(--color-white);
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.cta-section .section-headline {
    margin-bottom: var(--spacing-md);
}

.cta-section .section-intro {
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background-color: var(--color-gray-50);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-3xl);
    border-top: 1px solid var(--color-gray-200);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
    font-weight: 600;
}

.footer-section p {
    color: var(--color-gray-400);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--color-gray-400);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
    text-align: center;
}

.footer-bottom p {
    color: var(--color-gray-500);
    font-size: 0.875rem;
    margin: 0;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --spacing-3xl: 4rem;
        --spacing-2xl: 3rem;
    }
    
    .nav-list {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-black);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-gray-200);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        z-index: 999;
    }
    
    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .vorteile-grid,
    .target-grid,
    .process-grid,
    .projects-preview,
    .qual-grid {
        grid-template-columns: 1fr;
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .btn {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
    }
}

/* ============================================
   Performance Optimizations
   ============================================ */

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

/* ============================================
   Accessibility
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-white);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}