/* ================================
   Global Variables & Reset
   ================================ */

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

:root {
    /* Colors - Whitepaper Style */
    --primary-color: #000000;
    --primary-dark: #000000;
    --primary-light: #333333;
    --secondary-color: #666666;
    --accent-color: #000000;
    
    /* Text Colors */
    --text-primary: #000000;
    --text-secondary: #333333;
    --text-light: #666666;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --bg-dark: #000000;
    
    /* Border & Shadows */
    --border-color: #d0d0d0;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography - Monospace for typewriter feel */
    --font-sans: 'Prestige Elite', 'Prestige Elite Std', 'Courier New', monospace;
    --font-mono: 'Prestige Elite', 'Prestige Elite Std', 'Courier New', monospace;
}

html {
    scroll-behavior: auto;
}

body {
    font-family: var(--font-sans);
    line-height: 2;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-size: 14px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ================================
   Navigation
   ================================ */

.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: static;
    width: 100%;
}

.navbar .container {
    display: block;
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: left;
}

.nav-brand {
    margin-bottom: var(--spacing-sm);
}

.nav-brand a {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    padding-left: 0;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.9rem;
}

.nav-link.active {
    text-decoration: none;
}

.nav-link.active::before {
    content: '> ';
}

.nav-link::before {
    content: '  ';
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
}

/* ================================
   Hero Section (Landing Page)
   ================================ */

.hero {
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: auto;
    padding: 4rem 0 3rem;
    border-bottom: 1px solid var(--border-color);
}

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

.hero-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-align: center;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
}

.hero-subtitle {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.05em;
}

.hero-subtitle::before {
    content: 'Author: ';
}

.hero-description {
    font-size: 1rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
}

.hero-description::before {
    content: 'Abstract: ';
    display: block;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-start;
    flex-wrap: wrap;
}

/* ================================
   Page Content Layout
   ================================ */

.page-content {
    padding: 3rem 0 4rem;
    min-height: calc(100vh - 200px);
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-align: center;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ================================
   Footer
   ================================ */

.footer {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-lg) 0;
    text-align: left;
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-xl);
    font-size: 0.85rem;
}

.footer .container {
    display: block;
}

.footer p {
    margin-bottom: var(--spacing-xs);
}

.social-links {
    display: block;
    margin-top: var(--spacing-sm);
}

.social-links::before {
    content: 'Contact: ';
    display: block;
    margin-bottom: var(--spacing-xs);
}

.social-links a {
    color: var(--text-primary);
    text-decoration: underline;
    display: block;
    margin-bottom: 4px;
}

.social-links a::before {
    content: '  - ';
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
        padding: var(--spacing-lg) 0;
        gap: 0;
    }

    .nav-menu li {
        padding: var(--spacing-sm) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

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

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .page-title {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .page-title {
        font-size: 1.5rem;
    }
}