:root {
    --bg-color: #0B0F14;
    --surface-color: #151B26;
    --border-color: #1E2A3A;
    --text-primary: #F5F7FA;
    --text-secondary: #9CA3AF;
    --accent-color: #4989E5;
    --gradient-start: #8B5CF6;
    --gradient-end: #06B6D4;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    --spacing-xxxl: 32px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-xxxl) var(--spacing-lg);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.6s ease-out forwards;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    padding-top: var(--spacing-xxxl);
    padding-bottom: var(--spacing-xl);
}



.title {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: var(--spacing-xxl);
    background: linear-gradient(90deg, var(--text-primary) 0%, #E2E8F0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: var(--spacing-xxl);
}

.section {
    margin-bottom: var(--spacing-xxl);
}

.section h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: var(--spacing-sm);
}

.bullet-list {
    list-style-type: none;
    padding-left: var(--spacing-lg);
}

.bullet-list li {
    position: relative;
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: var(--spacing-xs);
}

.bullet-list li::before {
    content: "•";
    position: absolute;
    left: -16px;
    color: var(--text-secondary);
}

footer {
    margin-top: 48px;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
}

/* Scroll to top button */
.scroll-to-top {
    position: fixed;
    bottom: var(--spacing-xxxl);
    right: var(--spacing-xxxl);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.4);
}

.scroll-to-top:active {
    transform: translateY(0);
}

/* Make headings pop on hover - engaging micro-interaction */
.section h2 {
    transition: color 0.2s ease;
}

.section:hover h2 {
    color: #fff;
}

@media (max-width: 600px) {
    .container {
        padding-top: var(--spacing-lg);
    }

    header {
        padding-top: var(--spacing-lg);
    }

    .title {
        font-size: 28px;
    }

    .scroll-to-top {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }
}