/* Reset & Base */
:root {
    --bg-color: #ffffff;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --accent-color: #2563eb;
    /* Electric Blue */
    --accent-hover: #1d4ed8;
    --bg-alt: #f9fafb;
    --border-color: #e5e7eb;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn-primary {
    display: inline-block;
    background-color: var(--text-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 500;
    transition: background-color 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background-color: #000;
    transform: translateY(-1px);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-logo .accent {
    color: var(--accent-color);
}

.nav-links a {
    margin-left: 2rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding-top: 8rem;
    padding-bottom: 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-content {
    margin-bottom: 3rem;
    padding: 0 1rem;
}

.badge {
    display: inline-block;
    background-color: var(--bg-alt);
    color: var(--accent-color);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #111827, #4b5563);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-visual {
    width: 100%;
    max-width: 1000px;
    height: 500px;
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Sections */
.section {
    padding: 6rem 0;
}

.alt-bg {
    background-color: var(--bg-alt);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}

.chapter-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.text-block p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-card h3 {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

/* Charts */
.chart-container-large {
    position: relative;
    height: 500px;
    width: 100%;
    margin-bottom: 4rem;
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
}

.chart-container-wide {
    position: relative;
    height: 400px;
    width: 100%;
    margin-bottom: 4rem;
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
}

.content-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.col h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

/* Split Layout */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.feature-list {
    list-style: none;
    margin-top: 2rem;
}

.feature-list li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

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

.chart-side {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    height: 400px;
}

/* Conclusion */
.conclusion-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.card {
    background: var(--bg-alt);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

.card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

/* Footer */
footer {
    padding: 4rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Placeholders */
.img-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #f3f4f6, #e5e7eb);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 500;
    min-height: 300px;
    border-radius: 1rem;
}

.visual-break {
    margin-top: 4rem;
    height: 400px;
    border-radius: 1rem;
    overflow: hidden;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .content-grid,
    .content-columns,
    .split-layout,
    .conclusion-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .nav-links {
        display: none;
        /* Simple hide for mobile for now */
    }

    .hero-visual {
        height: auto;
        aspect-ratio: 16/9;
        /* Maintain aspect ratio on mobile to prevent blank space */
    }
}