:root {
    --bg-color: #ffffff;
    --text-color: #303526;
    --accent-color: #a9b48a;
    --accent-dark: #8e9974;
    --white: #ffffff;
    --light-grey: #f5f5f5;

    --font-heading: 'Proxima Nova', 'Montserrat', sans-serif;
    --font-body: 'Proxima Nova', 'Montserrat', sans-serif;

    --container-width: 1200px;
    --border-radius: 100px;
    /* Pill shape for buttons */
    --card-radius: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-body);
    font-weight: 300;
    /* Light */
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    /* Semibold */
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1,
h2 {
    font-size: 48px;
}

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

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

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--border-radius);
    background-color: var(--accent-color);
    color: var(--white);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid var(--accent-color);
    cursor: pointer;
    transition: var(--transition);
}

.btn:hover {
    background-color: var(--accent-dark);
    border-color: var(--accent-dark);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--accent-color);
}

.btn-outline:hover {
    background-color: var(--accent-color);
    color: var(--white);
}

.section {
    padding: 80px 0;
}

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

/* Header */
header {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: var(--container-width);
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    padding: 15px 0;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

header.scrolled {
    top: 10px;
    padding: 10px 0;
    background-color: rgba(255, 255, 255, 0.85);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links li a {
    font-weight: 500;
    font-size: 1rem;
    position: relative;
}

.nav-links li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

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

.mobile-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 600px;
    position: relative;
    display: flex;
    align-items: center;
    /* Vertically center */
    padding-bottom: 0;
    background-size: cover;
    background-position: center;
    color: var(--white);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.6));
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin-top: 10vh;
    text-align: left;
    /* Left align text */
    animation: fadeUp 1s ease forwards;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 2rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Page Gradient Background */
.page-gradient-bg {
    background: linear-gradient(to bottom,
            #ffffff 0%,
            var(--accent-color) 40%,
            var(--accent-color) 70%,
            #ffffff 100%);
}

/* Section 2: Use Cases (Anwendungsfälle) - Flip Cards */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.use-case-card {
    background-color: transparent;
    perspective: 1000px;
    height: 300px;
    /* fixed height for flip cards */
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
}

.use-case-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    /* Safari */
    backface-visibility: hidden;
    padding: 30px;
    border-radius: var(--card-radius);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.flip-card-front {
    background-color: var(--light-grey);
    color: var(--text-color);
}

.flip-card-front i {
    color: var(--accent-color);
    margin-bottom: 20px;
}

.flip-card-front h3 {
    color: var(--accent-dark);
    margin: 0;
}

.flip-card-back {
    background-color: var(--accent-color);
    color: var(--white);
    transform: rotateY(180deg);
}

.flip-card-back p {
    margin: 0;
}

/* Section 3: Reviews Slider */
.slider-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    padding: 20px 0;
}

.reviews-slider {
    display: flex;
    gap: 30px;
    width: max-content;
    animation: scroll-reviews 20s linear infinite;
}

.slider-container:hover .reviews-slider {
    animation-play-state: paused;
}

.review-card {
    background: var(--white);
    border: 1px solid #eee;
    padding: 30px;
    border-radius: var(--card-radius);
    font-style: italic;
    width: 350px;
    flex-shrink: 0;
    /* Prevent shrinking in flex container */
}

.review-author {
    margin-top: 20px;
    font-weight: 600;
    font-style: normal;
    color: var(--accent-color);
}

@keyframes scroll-reviews {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(calc(-50% - 15px));
    }
}

/* Section 4: About Me */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-img {
    border-radius: var(--card-radius);
    overflow: hidden;
    position: relative;
}

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

.about-text h2 {
    color: var(--text-color);
}

.about-details {
    margin-top: 20px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.badge {
    background: var(--light-grey);
    color: var(--accent-dark);
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Section 5: Practice (Bento Gallery) */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 250px;
    gap: 20px;
}

.bento-item {
    border-radius: var(--card-radius);
    overflow: hidden;
    position: relative;
}

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

.bento-item:hover img {
    transform: scale(1.05);
}

/* Bento positions */
.bento-item-1 {
    grid-column: span 2;
    grid-row: span 2;
}

.bento-item-2 {
    grid-column: span 2;
    grid-row: span 1;
}

.bento-item-3 {
    grid-column: span 1;
    grid-row: span 1;
}

.bento-item-4 {
    grid-column: span 1;
    grid-row: span 1;
}

.bento-item-5 {
    grid-column: span 4;
    grid-row: span 1;
}


/* Section 6: FAQ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid #eee;
    margin-bottom: 10px;
}

.faq-question {
    padding: 20px 0;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-toggle {
    font-size: 1.2rem;
    color: var(--accent-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    opacity: 0.8;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    /* high enough to contain content */
    padding-bottom: 20px;
}

/* Footer */
footer {
    background-color: transparent;
    color: var(--text-color);
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo img {
    height: 40px;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 10px;
}

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

.footer-bottom {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
}

.social-icon {
    font-size: 1.5rem;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

/* Contact Page */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
}

.contact-info-item {
    margin-bottom: 30px;
}

.contact-info-item h3 {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-control {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(169, 180, 138, 0.2);
}

textarea.form-control {
    border-radius: 20px;
    resize: vertical;
    min-height: 150px;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bento-item-1 {
        grid-column: span 2;
        grid-row: span 1;
    }

    .bento-item-2 {
        grid-column: span 1;
        grid-row: span 1;
    }

    .bento-item-3 {
        grid-column: span 1;
        grid-row: span 1;
    }

    .bento-item-4 {
        grid-column: span 1;
        grid-row: span 1;
    }

    .bento-item-5 {
        grid-column: span 2;
        grid-row: span 1;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        /* Mobile menu to be implemented with JS */
        position: absolute;
        top: calc(100% + 10px);
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
        border-radius: 20px;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 48px;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .about-img {
        order: -1;
    }

    .bento-grid {
        grid-template-columns: 1fr;
    }

    .bento-item {
        grid-column: span 1 !important;
        grid-row: span 1 !important;
    }
}