:root {
    --bg-color: #0B0E14; /* Deep, deep blue/black */
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --accent: #F7931A; /* Bitcoin Orange */
    --accent-glow: rgba(247, 147, 26, 0.3);
    
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --container-max: 1200px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    overflow-x: hidden;
    line-height: 1.6;
}

/* --- Layout --- */
#main-container {
    position: relative;
    width: 100%;
}

/* The Graphic Layer - Stays Sticky */
#viz-container {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    z-index: 0;
    background: radial-gradient(circle at center, #131A26 0%, #0B0E14 70%);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    transition: opacity 0.5s ease;
}

#landing-chart {
    width: 100%;
    height: 100%;
    /* Allow pointer events only when needed, usually we want click-through to scroll */
    pointer-events: all; 
}

/* The Narrative Layer - Scrolls Over */
#scroll-content {
    position: relative;
    z-index: 10;
    /* Move visualization behind content visually by using transparent spacers or padding */
    margin-top: -100vh; 
    padding-bottom: 0; /* Extra space at bottom */
    pointer-events: none; /* Let clicks pass through to chart if hitting empty space */
}

.step {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start; /* Left align usually looks better for scrollytelling */
    padding: 2rem 5%;
    max-width: 600px;
    margin-left: 5%; /* Offset to left */
    pointer-events: all; /* Re-enable for text selection/buttons */
}

/* Right aligned steps for variety */
.step.right {
    margin-left: auto;
    margin-right: 5%;
    align-items: flex-end;
    text-align: right;
}

.step.center {
    margin: 0 auto;
    align-items: center;
    text-align: center;
    max-width: 800px;
}

/* --- Typography & Components --- */
h1 {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #94A3B8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    line-height: 1.1;
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

p.lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 2rem;
}

.text-box {
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.4);
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.step.active .text-box {
    transform: translateY(0);
    opacity: 1;
}

.highlight {
    color: var(--accent);
    font-weight: 600;
}

.btn-primary {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 14px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 4px 14px var(--accent-glow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
    display: inline-block;
    background: rgba(255,255,255,0.1);
    color: var(--text-primary);
    padding: 14px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    margin-left: 10px;
    backdrop-filter: blur(5px);
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.2);
}

/* Scroll indicator */
.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-secondary);
    animation: bounce 2s infinite;
    font-size: 24px;
    opacity: 0.7;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0) translateX(-50%);}
    40% {transform: translateY(-10px) translateX(-50%);}
    60% {transform: translateY(-5px) translateX(-50%);}
}