:root {
    --primary-color: #2b4570;
    --secondary-color: #e8d5b5;
    --accent-color: #d17a22;
    --text-main: #333333;
    --text-muted: #666666;
    --bg-main: #fcfcfc;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

body {
    font-family: 'Oswald', sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
    margin-top: 2rem;
}

h3 {
    font-size: 1.75rem;
    margin-top: 2rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--accent-color);
    border-radius: 2px;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

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

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

/* Header & Navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 1rem 0;
}

.header-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.5px;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-main);
    font-weight: 600;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

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

/* Main Content */
.content-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.markdown-content img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin: 2rem 0;
    transition: transform 0.4s ease;
}

.markdown-content img:hover {
    transform: translateY(-5px);
}

.markdown-content ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.markdown-content li {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.markdown-content strong {
    color: var(--primary-color);
}

.markdown-content em {
    color: var(--text-muted);
}

/* Iframe */
iframe {
    width: 100%;
    max-width: 100%;
    height: 1300px;
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    margin-top: 2rem;
    background: white;
    overflow: hidden;
}

/* Contact Form Fold (Details/Summary) */
.contact-form-fold {
    margin-top: 2rem;
    text-align: center;
}

.contact-form-fold summary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--accent-color);
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    list-style: none;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.contact-form-fold summary::-webkit-details-marker {
    display: none;
}

.contact-form-fold summary:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}

.contact-form-fold[open] summary {
    margin-bottom: 2rem;
    background-color: var(--primary-color);
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--primary-color);
    color: white;
    margin-top: 4rem;
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .content-container {
        padding: 1.5rem 1rem;
    }
    
    h1 {
        font-size: 2rem;
        margin-top: 1rem;
    }

    h3 {
        font-size: 1.4rem;
    }

}