/* ============================================
   CSS Variables - Softer Dark Theme
   ============================================ */
:root {
    /* Softer Dark Mode Colors */
    --bg-primary: #121212;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #242424;
    --text-primary: #f5f5f5;
    --text-secondary: #d0d0d0;
    --text-tertiary: #a0a0a0;
    --border-color: #333333;
    --accent: #4a9eff;
    --accent-hover: #6bb0ff;
    --accent-light: rgba(74, 158, 255, 0.1);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-2xl: 10rem;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Colors */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-tertiary: #808080;
    --border-color: #e0e0e0;
    --accent: #0066cc;
    --accent-hover: #0052a3;
    --accent-light: rgba(0, 102, 204, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.75;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(18, 18, 18, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

[data-theme="light"] .navbar {
    background-color: rgba(255, 255, 255, 0.85);
}

.navbar.scrolled {
    background-color: var(--bg-primary);
    backdrop-filter: blur(30px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.nav-brand {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

@media (max-width: 768px) {
    .nav-brand {
        font-size: 0.9rem;
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    margin-top: 60px;
    min-height: 85vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-content {
    max-width: 900px;
}

.hero h1 {
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 650;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.hero h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 400;
    line-height: 1.4;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-style: italic;
}

.hero-description {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    max-width: 800px;
}

.hero-supporting {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    line-height: 1.85;
    max-width: 800px;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-xl) 0 var(--spacing-lg);
        min-height: auto;
    }
    
    .hero-cta {
        flex-direction: column;
    }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    letter-spacing: -0.01em;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(74, 158, 255, 0.3);
    outline: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover,
.btn-secondary:focus {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    outline: none;
}

[data-theme="light"] .btn-primary:hover,
[data-theme="light"] .btn-primary:focus {
    box-shadow: 0 8px 20px rgba(0, 102, 204, 0.25);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-xl) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    position: relative;
}

.section.revealed {
    opacity: 1;
    transform: translateY(0);
}

.section-alt {
    background-color: var(--bg-secondary);
    position: relative;
}

.section-alt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.section h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 650;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: -0.01em;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section h3:first-of-type {
    margin-top: var(--spacing-md);
}

.content {
    max-width: 800px;
}

.content p {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: var(--spacing-md);
}

.content p:last-child {
    margin-bottom: 0;
}

.content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition-fast);
    font-weight: 500;
}

.content a:hover,
.content a:focus {
    color: var(--accent-hover);
    border-bottom-color: var(--accent-hover);
    outline: none;
}

.contact-note {
    margin-top: var(--spacing-md);
    font-size: 1.125rem;
}

/* ============================================
   Selected Writing Section - Card Grid
   ============================================ */
.writing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

@media (min-width: 900px) {
    .writing-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .writing-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
}

.writing-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.writing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.writing-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.writing-card:hover::before {
    transform: scaleX(1);
}

[data-theme="light"] .writing-card:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.writing-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.writing-card-link:focus {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    border-radius: 12px;
}

.writing-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.writing-card:hover .writing-title {
    color: var(--accent);
}

.writing-oneliner {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.writing-link {
    margin-top: var(--spacing-sm);
    font-size: 0.95rem;
    color: var(--accent);
    font-weight: 500;
    transition: var(--transition-fast);
}

.writing-card:hover .writing-link {
    color: var(--accent-hover);
    transform: translateX(4px);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    background-color: var(--bg-secondary);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.footer-text {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ============================================
   Accessibility
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Ensure sufficient contrast for WCAG AA */
.content a,
.writing-link {
    color: var(--accent);
}

[data-theme="light"] .content a,
[data-theme="light"] .writing-link {
    color: var(--accent);
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .navbar,
    .hero-cta {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}