:root {
    --primary-color: #0056b3;
    --secondary-color: #6c757d;
    --background-light: #f8f9fa;
    --text-dark: #333;
    --white: #ffffff;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    margin: 0;
    background-color: var(--background-light);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: var(--primary-color);
    color: var(--white);
    margin-bottom: 30px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.main-nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

.main-nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
}

.main-nav a:hover {
    opacity: 0.8;
}

.btn-nav {
    background: var(--white);
    color: var(--primary-color) !important;
    padding: 8px 15px;
    border-radius: 4px;
}

.btn-nav:hover {
    background: #f0f0f0;
    opacity: 1 !important;
}

section {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    /* Offset für Sticky Header beim Scrollen */
    scroll-margin-top: 100px;
}

h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--background-light);
    padding-bottom: 10px;
    margin-top: 0;
}

.placeholder-img {
    background: #ddd;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: bold;
    color: #666;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.checkbox-group input {
    margin-top: 5px;
}

.btn-submit {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    transition: background 0.3s;
}

.btn-submit:hover {
    background: #004494;
}

footer {
    text-align: center;
    padding: 20px 0;
    color: var(--secondary-color);
}

#calendar {
    margin-top: 20px;
    max-height: 600px;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    .main-nav {
        display: none; /* Auf kleinen Handys Navigation ausblenden oder Burger-Menü (optional) */
    }
}