/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-text: #000000;
    --color-bg: #ffffff;
    --color-accent: #00a86b;
    --color-border: #e0e0e0;
    --font-serif: 'Crimson Text', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --spacing: 2rem;
    --max-width: 1200px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
}

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

.nav-menu a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: opacity 0.2s;
}

.nav-menu a:hover {
    opacity: 0.6;
}

.nav-menu a.active {
    border: 1px solid var(--color-text);
    padding: 0.25rem 0.75rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem var(--spacing) 4rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero-content {
    width: 100%;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.hero-date {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.hero-authors {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 3rem;
}

.hero-intro {
    max-width: 800px;
    margin-bottom: 3rem;
}

.hero-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.hero-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: 1px solid var(--color-text);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.hero-btn:hover {
    background: var(--color-text);
    color: var(--color-bg);
}

.hero-info {
    max-width: 800px;
    margin-top: 2rem;
    padding: 1.5rem;
    border-left: 2px solid var(--color-accent);
    background: #f9f9f9;
    display: none;
}

.hero-info.active {
    display: block;
}

.hero-info p {
    line-height: 1.8;
    color: var(--color-text);
}

/* Sections */
.section {
    padding: 6rem var(--spacing);
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--color-text);
    line-height: 1.2;
}

.content-text {
    max-width: 800px;
}

.content-text p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
    color: var(--color-text);
}

.content-text h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.content-text ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 2rem;
}

.content-text li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}

.content-text li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

.content-text a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid var(--color-accent);
    transition: opacity 0.2s;
}

.content-text a:hover {
    opacity: 0.7;
}

.download-link {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--color-text);
    color: var(--color-bg);
    text-decoration: none;
    border: 1px solid var(--color-text);
    transition: all 0.2s;
    margin-top: 1rem;
}

.download-link:hover {
    background: transparent;
    color: var(--color-text);
}

/* Hero Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-box {
    text-align: center;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 8px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 600;
    font-family: var(--font-serif);
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.4;
}

/* Chart Container */
.chart-container {
    margin: 3rem 0;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 8px;
    position: relative;
    min-height: 400px;
}

/* White Paper Container */
.whitepaper-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.whitepaper-container section {
    padding: 6rem var(--spacing);
}

.whitepaper-container section:first-of-type {
    padding-top: 8rem;
}

/* Markdown Content Styling */
.whitepaper-container h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    margin-top: 0;
    color: var(--color-text);
}

.whitepaper-container h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    line-height: 1.2;
    margin-top: 4rem;
    margin-bottom: 2rem;
    color: var(--color-text);
    scroll-margin-top: 100px;
}

.whitepaper-container h2:first-child {
    margin-top: 0;
}

.whitepaper-container h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1rem;
    color: var(--color-text);
    line-height: 1.3;
}

.whitepaper-container h4 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.whitepaper-container p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--color-text);
    max-width: 800px;
}

.whitepaper-container ul,
.whitepaper-container ol {
    margin-bottom: 2rem;
    padding-left: 2rem;
    max-width: 800px;
}

.whitepaper-container li {
    margin-bottom: 0.75rem;
    line-height: 1.8;
    color: var(--color-text);
}

.whitepaper-container ul li {
    list-style-type: disc;
}

.whitepaper-container ol li {
    list-style-type: decimal;
}

.whitepaper-container strong {
    font-weight: 600;
    color: var(--color-text);
}

.whitepaper-container em {
    font-style: italic;
}

.whitepaper-container a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid var(--color-accent);
    transition: opacity 0.2s;
}

.whitepaper-container a:hover {
    opacity: 0.7;
}

.whitepaper-container hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 4rem 0;
}

.whitepaper-container blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: 2rem;
    margin: 2rem 0;
    font-style: italic;
    color: #666;
    max-width: 800px;
}

.whitepaper-container code {
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    background: rgba(0, 0, 0, 0.05);
    padding: 0.2em 0.4em;
    border-radius: 3px;
}

.whitepaper-container pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
    max-width: 800px;
}

.whitepaper-container pre code {
    background: none;
    padding: 0;
}

.whitepaper-container table {
    width: 100%;
    max-width: 800px;
    border-collapse: collapse;
    margin: 2rem 0;
}

.whitepaper-container th,
.whitepaper-container td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.whitepaper-container th {
    font-weight: 600;
    background: rgba(0, 0, 0, 0.02);
}

/* Fade-in animation */
.whitepaper-container section.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.whitepaper-container section.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Footer */
.footer {
    padding: 4rem var(--spacing) 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --spacing: 1.5rem;
    }

    .nav-menu {
        gap: 1rem;
    }

    .nav-menu a {
        font-size: 0.85rem;
    }

    .hero {
        padding: 6rem var(--spacing) 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-intro p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-btn {
        width: 100%;
    }

    .section {
        padding: 4rem var(--spacing);
    }

    .section-title {
        font-size: 2rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .hero-buttons,
    .hero-info {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}