/* ===========================================
   Net-Trainings Consulting - Stylesheet
   Modern, Responsive Design System
   =========================================== */

:root {
    --color-primary: #007bff;
    --color-primary-dark: #0056b3;
    --color-primary-light: #4da3ff;
    --color-text: #2c3e50;
    --color-text-light: #6c757d;
    --color-background: #ffffff;
    --color-background-alt: #f8f9fa;
    --color-border: #e0e0e0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-3xl: 2.5rem;
    --line-height-base: 1.6;
    --line-height-tight: 1.2;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --box-shadow-sm: 0 2px 4px var(--color-shadow);
    --box-shadow-md: 0 4px 12px var(--color-shadow);
    --box-shadow-lg: 0 8px 24px var(--color-shadow);
    
    --transition-base: 0.3s ease;
    --container-max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

.container {
    width: 90%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) 0;
}

a {
    text-decoration: none;
    color: var(--color-primary);
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-primary-dark);
}

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

h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, var(--font-size-3xl));
    color: var(--color-primary);
}

h3 {
    font-size: var(--font-size-xl);
    color: var(--color-text);
}

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

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.main-header {
    background-color: var(--color-background);
    box-shadow: var(--box-shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    height: 50px;
    width: auto;
}

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

.main-nav a {
    color: var(--color-text);
    font-weight: 500;
    font-size: var(--font-size-base);
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition-base);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

.main-nav a:hover {
    color: var(--color-primary);
}

.main-nav a:hover::after {
    width: 100%;
}

/* ==========================================
   BUTTONS
   ========================================== */
.cta-button,
.primary-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    box-shadow: var(--box-shadow-sm);
}

.cta-button:hover,
.primary-button:hover {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-md);
    color: #fff;
}

.cta-button:active,
.primary-button:active {
    transform: translateY(0);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero-section {
    position: relative;
    background: linear-gradient(135deg, rgba(0,0,0,0.6), rgba(0,0,0,0.55)),
                url('background.png') no-repeat center center/cover;
    background-attachment: fixed;
    color: #fff;
    text-align: center;
    padding: clamp(80px, 15vh, 120px) var(--spacing-lg);
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.2) 100%);
    pointer-events: none;
}

.hero-section .container {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero-section h1 {
    color: #fff;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease-out;
}

.hero-section p {
    color: #fff;
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-section .primary-button {
    animation: fadeInUp 0.8s ease-out 0.4s forwards;
    font-size: var(--font-size-lg);
    opacity: 0;
}

.hero-section .primary-button:hover {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    transform: translateY(-2px) !important;
    box-shadow: var(--box-shadow-md);
    color: #fff;
}

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


/* ==========================================
   SECTIONS
   ========================================== */
section {
    padding: var(--spacing-2xl) 0;
}

h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    margin: var(--spacing-md) auto 0;
    border-radius: var(--border-radius-sm);
}

/* ==========================================
   SERVICES SECTION
   ========================================== */
.services-section {
    background-color: var(--color-background);
}

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

.service-item {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-sm);
    text-align: center;
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.service-item h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.service-item p {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 0;
}


/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.contact-form {
    max-width: 700px;
    margin: var(--spacing-xl) auto 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    background: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-md);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: all var(--transition-base);
    background-color: var(--color-background-alt);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-background);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 150px;
    line-height: var(--line-height-base);
}

.contact-form button[type="submit"] {
    margin-top: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
}

#message {
    margin-top: var(--spacing-md);
    text-align: center;
    font-weight: 500;
}

/* ==========================================
   FOOTER
   ========================================== */
.main-footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: #fff;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.main-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.main-footer p {
    margin: 0;
    opacity: 0.9;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    align-items: center;
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-base);
    padding: var(--spacing-xs);
}

.footer-nav a:hover {
    color: #fff;
    transform: translateY(-2px);
}


/* ==========================================
   HAMBURGER MENU
   ========================================== */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
    transition: transform var(--transition-base);
}

.hamburger:hover {
    transform: scale(1.1);
}

.hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    margin: 3px 0;
    background: var(--color-text);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-base);
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.hamburger[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}
/* ==========================================
   PRIVACY & IMPRESSUM PAGES
   ========================================== */
.privacy-section,
.imprint-section {
    background-color: var(--color-background);
    padding: var(--spacing-2xl) 0;
}

.privacy-section .container,
.imprint-section .container {
    max-width: 900px;
}

.privacy-section h1,
.imprint-section h1 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.privacy-section h2,
.imprint-section h2,
.section-title {
    color: var(--color-text);
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.privacy-section p,
.privacy-section ul,
.imprint-section p,
.imprint-section ul {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
}

.privacy-section ul,
.imprint-section ul {
    padding-left: var(--spacing-lg);
}

.privacy-section li,
.imprint-section li {
    margin-bottom: var(--spacing-xs);
}

.privacy-section a,
.imprint-section a {
    color: var(--color-primary);
    text-decoration: underline;
}

.privacy-section a:hover,
.imprint-section a:hover {
    color: var(--color-primary-dark);
}

.last-update {
    margin-top: var(--spacing-xl);
    font-style: italic;
    color: var(--color-text-light);
    text-align: right;
}

/* ==========================================
   RESPONSIVE - TABLETS
   ========================================== */
@media (max-width: 900px) {
    :root {
        --spacing-xl: 2.5rem;
        --spacing-2xl: 3rem;
    }
    
    .container {
        width: 95%;
    }

    .main-header .container {
        flex-wrap: wrap;
        position: relative;
    }

    .hamburger {
        display: flex;
        order: 3;
        margin-left: auto;
    }

    .cta-button {
        order: 2;
        margin-left: auto;
        margin-right: var(--spacing-sm);
    }

    .main-nav {
        order: 4;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        width: 100%;
        background: var(--color-background);
        box-shadow: var(--box-shadow-md);
        display: none;
    }

    .main-nav.open {
        display: block;
        animation: slideDown var(--transition-base);
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }

    .main-nav li {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }

    .main-nav li:last-child {
        border-bottom: none;
    }

    .main-nav a {
        display: block;
        padding: var(--spacing-md) var(--spacing-lg);
        width: 100%;
    }

    .main-nav a::after {
        display: none;
    }

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

    .hero-section {
        padding: clamp(60px, 12vh, 100px) var(--spacing-md);
        min-height: 400px;
    }
    
    .contact-form {
        padding: var(--spacing-lg);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================
   RESPONSIVE - MOBILE
   ========================================== */
@media (max-width: 600px) {
    :root {
        --font-size-base: 15px;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }
    
    html {
        scroll-padding-top: 70px;
    }

    .container {
        width: 95%;
        padding: var(--spacing-md) 0;
    }

    .main-header .container {
        padding: var(--spacing-xs) 0;
    }

    .logo img {
        height: 40px;
    }

    .cta-button {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-md);
    }

    .hero-section {
        padding: clamp(40px, 10vh, 80px) var(--spacing-sm);
        min-height: 350px;
        background-attachment: scroll;
    }

    .hero-section h1 {
        font-size: clamp(1.5rem, 8vw, 2.5rem);
    }

    .hero-section p {
        font-size: var(--font-size-base);
    }

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

    h2 {
        font-size: clamp(1.5rem, 6vw, 2rem);
        margin-bottom: var(--spacing-lg);
    }

    .service-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .service-item {
        padding: var(--spacing-lg);
    }

    .contact-form {
        padding: var(--spacing-md);
    }

    .contact-form input,
    .contact-form textarea {
        padding: var(--spacing-sm);
    }

    .main-footer {
        padding: var(--spacing-lg) 0;
    }

    .main-footer .container {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }

    .footer-nav {
        justify-content: center;
    }
}

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

*:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

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