/* Design System Variables */
:root {
    /* Color System */
    --color-primary: #1b1c39;
    --color-primary-light: #2a2b4d;
    --color-primary-dark: #12132a;
    --color-secondary: #a3ceef;
    --color-secondary-light: #b8d9f2;
    --color-secondary-dark: #8ebde9;
    --color-accent: #ffe470;
    --color-accent-light: #ffe88a;
    --color-accent-dark: #ffdf56;
    --color-neutral: #9b9b9a;
    --color-neutral-light: #b3b3b2;
    --color-neutral-dark: #838382;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-border: #ececf0;
    --color-background-light: #fafbfc;
    --color-gold: #b48a00;
    --color-accent-alt: #ffe547;

    /* Typography */
    --font-primary: 'Bookman Old Style', serif;
    --font-size-h1: 3rem;
    --font-size-h2: 2.25rem;
    --font-size-h3: 1.5rem;
    --font-size-body: 1rem;
    --font-size-small: 0.875rem;
    --line-height-body: 1.5;
    --line-height-heading: 1.2;
    --letter-spacing: 0.02em;

    /* Spacing System */
    --spacing-unit: 8px;
    --spacing-xs: calc(var(--spacing-unit) * 1);
    --spacing-sm: calc(var(--spacing-unit) * 2);
    --spacing-md: calc(var(--spacing-unit) * 3);
    --spacing-lg: calc(var(--spacing-unit) * 4);
    --spacing-xl: calc(var(--spacing-unit) * 6);
    --spacing-xxl: calc(var(--spacing-unit) * 8);

    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* General Styles */
body,
html {
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
    overflow: auto;
    color: var(--color-primary);
    line-height: var(--line-height-body);
    letter-spacing: var(--letter-spacing);
    scroll-behavior: smooth;
    max-width: 100vw;
    overflow-x: hidden;
}

hr {
    border: 0;
    height: 3px;
    background: linear-gradient(to right, 
        transparent 0%,
        var(--color-primary) 50%,
        transparent 100%
    );
    margin: var(--spacing-xxl);
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--color-primary);
    line-height: var(--line-height-heading);
    font-family: var(--font-primary);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }

p {
    color: var(--color-neutral-dark);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    margin-bottom: var(--spacing-md);
}

/* Hero Section Styles */
#carousel-container {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    z-index: 1;
    background: none;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease-in-out, visibility 1s ease-in-out;
}

.slide.active {
    opacity: 1;
    visibility: visible;
}

.image-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform 10s ease-in-out;
    z-index: -1;
}

.slide.active .image-container {
    transform: scale(1.1);
}

.content {
    position: absolute;
    bottom: 30%;
    left: 0%;
    color: var(--color-white);
    text-shadow: 0 0 15px rgba(0, 0, 0, 0.7);
    max-width: 55%;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1s ease, transform 1s ease;
    background: rgba(0, 0, 0, 0.7);
    padding: 25px 25px 25px 10%;
    font-family: var(--font-primary);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    letter-spacing: var(--letter-spacing);
}

.content.visible {
    opacity: 1;
    transform: translateY(0);
}

.content h1 {
    font-size: var(--font-size-h1);
    margin: 0;
    line-height: 1.5;
    word-break: keep-all;
    color: var(--color-white);
    font-family: var(--font-primary);
}

.content p {
    font-size: var(--font-size-body);
    margin: 1.5rem 0 0.5rem 0;
    color: var(--color-white);
    font-family: var(--font-primary);
}

.spacer {
    height: 100px;
}

/* Navigation Menu */
#navigation-menu {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 100%;
    height: 10vh;
    color: var(--color-neutral);
    font-size: 16px;
    text-align: center;
    position: absolute;
    bottom: 0;
    left: 0;
    background: rgba(27, 28, 57, 0.8);
    z-index: 2;
    backdrop-filter: none;
}

@media (max-width: 900px) {
    #navigation-menu {
        justify-content: flex-start;
        width: 100vw;
        overflow-x: auto;
        overflow-y: hidden;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
        font-size: 14px;
    }
    #navigation-menu::-webkit-scrollbar {
        display: none; /* Chrome/Safari */
    }
}

.menu-item {
    flex: 0 0 auto;
    padding: 10px 20px;
    margin-right: 5px;
    cursor: pointer;
    color: var(--color-neutral);
    font-family: var(--font-primary);
    font-size: 16px;
    background: none;
    border: none;
    transition: color 0.3s;
}

.menu-item.active {
    color: var(--color-accent-alt);
}

/* Loading Bar */
#loading-bar {
    position: absolute;
    bottom: 10vh;
    height: 5px;
    width: 0;
    background: var(--color-accent-alt);
    transition: left 0.5s ease, width 5s linear;
    z-index: 3;
}

/* CTA Button */
.cta-button {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-accent);
    color: var(--color-primary);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    margin-top: var(--spacing-md);
    transition: all var(--transition-normal);
    font-weight: 600;
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Logo Container */
#logo-container {
    position: absolute;
    top: var(--spacing-xl);
    left: var(--spacing-xl);
    z-index: 100;
    position: fixed;
}

#logo {
    height: 50px;
    width: auto;
    cursor: pointer;
    transition: transform var(--transition-normal);
}

/* Service Sections */
.service-details-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.service-section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-neutral-light);
}

.service-section:last-child {
    border-bottom: none;
}

.service-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.service-content h2 {
    font-size: var(--font-size-h2);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-heading);
}

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

.service-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--color-border);
}

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

.service-card h3 {
    font-size: var(--font-size-h3);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-heading);
}

.service-card p {
    color: var(--color-neutral-dark);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
}

/* Project Experience Section */
.project-experience-section {
    background: var(--color-white);
    padding: var(--spacing-xxl) 0;
}

.project-experience-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.project-experience-container h2 {
    font-size: var(--font-size-h2);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-heading);
    text-align: center;
}

.filter-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-tag {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-neutral-light);
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--color-primary);
    font-size: var(--font-size-small);
    border: none;
}

.filter-tag:hover {
    background: var(--color-neutral);
    color: var(--color-white);
}

.filter-tag.active {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Privacy Section */
.privacy-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.privacy-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Impressum Section */
.imprint-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.imprint-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Project Cards */
.project-carousel {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
    align-items: stretch;
}

.project-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(27,28,57,0.08), 0 1.5px 4px rgba(27,28,57,0.04);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 420px;
    padding: 0;
}

.project-card-inner {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-lg);
    flex: 1 1 auto;
}

.project-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    margin: 0;
    display: block;
}

.project-card h3 {
    font-size: var(--font-size-h3);
    color: var(--color-primary);
    margin: 0 0 var(--spacing-md) 0;
    line-height: var(--line-height-heading);
    font-weight: 700;
}

.project-card p {
    color: var(--color-neutral-dark);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
}

.project-card .cta-button {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    align-self: flex-start;
    background: var(--color-accent);
    color: var(--color-primary);
    font-weight: 700;
    border: none;
    border-radius: var(--border-radius-sm);
    box-shadow: none;
    transition: background var(--transition-normal), color var(--transition-normal);
}

.project-card .cta-button:hover {
    background: var(--color-primary);
    color: var(--color-accent);
}

.project-card strong {
    display: block;
    margin-top: var(--spacing-sm);
    color: var(--color-gold);
    font-weight: 700;
    font-size: var(--font-size-small);
    letter-spacing: 0.01em;
}

.project-card-inner {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.project-card .cta-button, .project-card strong {
    margin-top: auto;
}

.project-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 8px 32px rgba(27,28,57,0.12), 0 2px 8px rgba(27,28,57,0.06);
}

.project-card.hidden { display: none !important; }

/* Skip Navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 8px;
    z-index: 100;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

/* Focus States */
:focus {
    outline: 3px solid var(--color-secondary);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

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

/* Keyboard Navigation */
.menu-item:focus {
    background-color: rgba(163, 206, 239, 0.2);
}

.cta-button:focus {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* Mehr Button and Accordion */
.mehr-button {
    display: block;
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: none;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    font-family: var(--font-primary);
    font-size: var(--font-size-body);
    cursor: pointer;
    transition: all var(--transition-normal);
    border-radius: var(--border-radius-sm);
}

.mehr-button:hover,
.mehr-button:focus {
    background: var(--color-primary);
    color: var(--color-white);
}

.mehr-button[aria-expanded="true"] {
    background: var(--color-primary);
    color: var(--color-white);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) ease-out;
    margin: 0 auto;
    max-width: 800px;
    padding: 0 var(--spacing-lg);
}

.accordion-content[aria-hidden="false"] {
    max-height: 2000px;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.accordion-content h4 {
    font-size: var(--font-size-h3);
    color: var(--color-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    line-height: var(--line-height-heading);
}

.accordion-content p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-body);
    color: var(--color-neutral-dark);
}

.accordion-content ul {
    padding: 0;
    margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-lg);
}

.accordion-content ul li {
    margin-bottom: var(--spacing-sm);
}

.accordion-content ul li a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-normal);
    display: inline-block;
    padding: var(--spacing-xs) 0;
}

.accordion-content ul li a:hover {
    text-decoration: underline;
}

.accordion-content ul li a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

a:hover {
    text-decoration: underline;
    text-decoration-color: var(--color-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 2px;
}

a:visited {
    color: var(--color-primary);
}

/* About Us Section */
.about-us-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.about-us-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.contact-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.contact-container p {
    font-size: var(--font-size-body);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-body);
    color: var(--color-neutral-dark);
}

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

.contact-container form label {
    margin-bottom: 4px;
    font-weight: 600;
    color: var(--color-primary);
    display: block;
    font-size: var(--font-size-body);
}

.contact-container form input,
.contact-container form textarea {
    padding: var(--spacing-md);
    border: 1.5px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-body);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    background: var(--color-background-light);
    box-shadow: 0 1px 4px rgba(27,28,57,0.04);
    margin-bottom: var(--spacing-sm);
}

.contact-container form input:focus,
.contact-container form textarea:focus {
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 2px var(--color-secondary-light);
    outline: none;
}

.contact-container form textarea {
    min-height: 100px;
    resize: vertical;
}

.contact-container .privacy-row {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-small);
    color: var(--color-neutral-dark);
}

.contact-container .privacy-row input[type="checkbox"] {
    margin-top: 3px;
    accent-color: var(--color-secondary);
    width: 18px;
    height: 18px;
}

.contact-container .privacy-row label,
.contact-container .privacy-row span {
    font-weight: 400;
    color: var(--color-primary);
    cursor: pointer;
}

.contact-container form button, .contact-container form input[type="submit"] {
    background: var(--color-accent);
    color: var(--color-primary);
    font-weight: 700;
    font-size: var(--font-size-body);
    border: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-container form button:hover, .contact-container form input[type="submit"]:hover {
    background: var(--color-primary);
    color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.contact-container h2 {
    font-size: var(--font-size-h2);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-heading);
}

.bigger {
    font-size: calc(var(--font-size-body) * 1.5);
}

/* Responsive Design */
@media (max-width: 1390px) {
    #logo-container {
        top: calc(var(--spacing-md) / 4);
        left: calc(var(--spacing-md) / 4);
    }
    
    #logo {
        height: 35px;
    }
}

@media (max-width: 1275px) {
    #logo-container {
        top: calc(var(--spacing-md) / 4);
        left: calc(var(--spacing-md) / 4);
    }
    
    #logo {
        height: 25px;
    }
}

@media (max-width: 1200px) {
    :root {
        --font-size-h1: 2.5rem;
        --font-size-h2: 2rem;
        --font-size-h3: 1.25rem;
    }
    
    .content {
        max-width: 70%;
    }
}

@media (max-width: 900px) {
    #navigation-menu {
        justify-content: flex-start;
        width: 100vw;
        overflow-x: auto;
        overflow-y: hidden;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        font-size: 14px;
    }
    
    #navigation-menu::-webkit-scrollbar {
        display: none;
    }
    
    .project-carousel {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --font-size-h3: 1.125rem;
    }
    
    .content {
        max-width: 85%;
        padding: var(--spacing-md);
    }
    
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-tags {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-tag {
        width: 100%;
        text-align: center;
    }

    /* Background Image Positioning */
    .digital-solutions-img {
        background-position: 70%;
        background-repeat: no-repeat;
    }

    .org-transformation-img {
        background-position: 60%;
        background-repeat: no-repeat;
    }

    .product-go-img {
        background-position: 30% center;
        background-size: 120%;
        background-repeat: no-repeat;
    }

    .boutique-recruiting-img {
        background-position: 100% 70;
        background-repeat: no-repeat;
    }

    .ai-solutions-img {
        background-position: 25%;
        background-repeat: no-repeat;
    }

    .air-quality-img {
        background-position: 80%;
        background-repeat: no-repeat;
    }
}

@media (max-width: 600px) {
    .project-carousel {
        grid-template-columns: 1fr;
    }
    
    .project-card img {
        height: 140px;
    }
    
    .project-card-inner {
        padding: var(--spacing-md);
    }
    
    .project-card {
        min-height: 320px;
    }
    
    .contact-container {
        padding: 0 var(--spacing-sm);
    }
    
    .contact-container form {
        padding: 1rem;
        gap: 0.8rem;
    }
    
    .contact-container form input,
    .contact-container form textarea {
        font-size: var(--font-size-small);
        padding: var(--spacing-sm);
    }
    
    .contact-container form button,
    .contact-container form input[type="submit"] {
        font-size: var(--font-size-small);
        padding: var(--spacing-sm);
    }
    
    .contact-container .privacy-row {
        font-size: 0.8rem;
        flex-direction: column;
        align-items: flex-start;
    }

    .contact-form {
        padding: 1rem;
        gap: 0.8rem;
    }
}

@media (max-width: 490px) {
    :root {
        --font-size-h1: 1.75rem;
        --font-size-h2: 1.5rem;
        --font-size-h3: 1rem;
    }
    
    .content {
        max-width: 100%;
        left: 0;
        bottom: 20%;
    }
}

.contact-form {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--color-white);
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(27,28,57,0.08);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.contact-form label {
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.contact-form input,
.contact-form textarea {
    padding: 0.8rem;
    border: 1.5px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--color-background-light);
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 2px var(--color-secondary-light);
    outline: none;
}

.contact-form textarea {
    min-height: 100px;
    resize: vertical;
}

.privacy-row {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.95rem;
}

.privacy-row input[type="checkbox"] {
    margin-top: 0.2rem;
    accent-color: var(--color-secondary);
}

.contact-form button {
    background: var(--color-accent);
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.1rem;
    border: none;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 0.5rem;
    box-shadow: 0 2px 8px rgba(27,28,57,0.04);
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.contact-form button:hover {
    background: var(--color-primary);
    color: var(--color-accent);
    box-shadow: 0 4px 16px rgba(27,28,57,0.10);
}

/* Email obfuscation styling */
.email-link {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: 500;
}

.email-link:hover {
    color: var(--color-secondary-dark);
    text-decoration: underline;
}

.email-link:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Ensure email spans don't break layout */
[data-email-encoded] {
    display: inline;
}