/* ==========================================
   CSS Reset & Custom Properties
   ========================================== */

:root {
    /* Farbpalette - Modern & Elegant */
    --color-primary: #2c3e50;
    --color-primary-light: #34495e;
    --color-primary-dark: #1a252f;
    --color-accent: #3498db;
    --color-accent-hover: #2980b9;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-background: #ffffff;
    --color-background-alt: #f8f9fa;
    --color-border: #e0e0e0;
    --color-success: #27ae60;
    --color-overlay: rgba(0, 0, 0, 0.7);

    /* Typografie */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-heading: 'Georgia', 'Times New Roman', serif;
    --font-size-base: 16px;
    --font-size-small: 0.875rem;
    --font-size-large: 1.125rem;
    --line-height-base: 1.6;
    --line-height-heading: 1.2;

    /* Abstände */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;

    /* Breakpoints */
    --breakpoint-mobile: 480px;
    --breakpoint-tablet: 768px;
    --breakpoint-desktop: 1024px;
    --breakpoint-wide: 1440px;

    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --transition-speed: 0.3s;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --box-shadow-hover: 0 8px 12px rgba(0, 0, 0, 0.15);
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

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

/* ==========================================
   Typografie
   ========================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: var(--line-height-heading);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.lead {
    font-size: var(--font-size-large);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   Layout
   ========================================== */

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

section {
    padding: var(--spacing-xxl) 0;
}

section:nth-child(even) {
    background-color: var(--color-background-alt);
}

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

header {
    background-color: var(--color-primary);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color var(--transition-speed) ease;
}

header.scrolled {
    background-color: var(--color-primary-dark);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-background);
    font-family: var(--font-heading);
    transition: transform var(--transition-speed) ease;
    display: inline-block;
}

.logo a:hover {
    transform: scale(1.05);
    color: var(--color-background);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu li a {
    color: var(--color-background);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease;
    position: relative;
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: all var(--transition-speed) ease;
    transform: translateX(-50%);
}

.nav-menu li a:hover::after,
.nav-menu li a.active::after {
    width: 80%;
}

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-background);
    transition: all var(--transition-speed) ease;
    border-radius: 2px;
}

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

.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-background);
    text-align: center;
    padding: var(--spacing-xxl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    color: var(--color-background);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease-out;
}

.hero .lead {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease-out 0.2s both;
}

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

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-speed) ease;
    font-family: var(--font-primary);
    font-size: 1rem;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-background);
    box-shadow: var(--box-shadow);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
    color: var(--color-background);
}

.btn-primary:active {
    transform: translateY(0);
}

/* ==========================================
   About Section
   ========================================== */

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-top: var(--spacing-lg);
}

.about-text p {
    font-size: var(--font-size-large);
    line-height: 1.8;
    color: var(--color-text);
}

.about-image {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow-hover);
    transition: transform var(--transition-speed) ease;
}

.about-image:hover {
    transform: scale(1.02);
}

.about-image img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* ==========================================
   Portfolio Section
   ========================================== */

.portfolio {
    background-color: var(--color-background);
}

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

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    aspect-ratio: 4 / 3;
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-overlay);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}

.portfolio-overlay h3 {
    color: var(--color-background);
    margin-bottom: var(--spacing-xs);
    transform: translateY(20px);
    transition: transform var(--transition-speed) ease;
}

.portfolio-overlay p {
    color: var(--color-background);
    text-align: center;
    transform: translateY(20px);
    transition: transform var(--transition-speed) ease 0.1s;
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-item:hover .portfolio-overlay h3,
.portfolio-item:hover .portfolio-overlay p {
    transform: translateY(0);
}

.portfolio-item:hover {
    box-shadow: var(--box-shadow-hover);
}

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

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

.contact-form {
    max-width: 600px;
    margin: var(--spacing-lg) auto 0;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
    background-color: var(--color-background);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

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

.contact-form .btn {
    width: 100%;
    animation: none;
}

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

footer {
    background-color: var(--color-primary-dark);
    color: var(--color-background);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
}

.footer-section ul {
    list-style: none;
}

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

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-speed) ease;
}

.footer-section ul li a:hover {
    color: var(--color-accent);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease;
}

.social-links a:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-background);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-small);
}

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@media (max-width: 768px) {
    :root {
        --spacing-xxl: 3rem;
        --spacing-xl: 2.5rem;
        --spacing-lg: 2rem;
    }

    /* Navigation für Mobile */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background-color: var(--color-primary);
        width: 100%;
        text-align: center;
        transition: left var(--transition-speed) ease;
        padding: var(--spacing-md) 0;
        box-shadow: var(--box-shadow);
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    /* About Section */
    .about-content {
        grid-template-columns: 1fr;
    }

    /* Portfolio Grid */
    .portfolio-grid {
        grid-template-columns: 1fr;
    }

    /* Hero */
    .hero {
        min-height: 60vh;
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==========================================
   Print Styles
   ========================================== */

@media print {
    header,
    .mobile-menu-toggle,
    .btn,
    footer {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
    }

    section {
        page-break-inside: avoid;
    }
}

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

/* Focus-Styles für Tastaturnavigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Reduced Motion für Benutzer mit Bewegungsempfindlichkeit */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #1a1a1a;
        --color-background-alt: #2a2a2a;
        --color-text: #e0e0e0;
        --color-text-light: #b0b0b0;
        --color-border: #404040;
    }
}