:root {
    --primary: #6366f1;
    --secondary: #06b6d4;
    --text-dark: #1f2937;
    --text-muted: #6b7280;
    --background: #fdfdfd;
    --container-bg: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 15px 40px rgba(99, 102, 241, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.layout-wrapper {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 30px;
    width: 100%;
    max-width: 1200px;
}

.sidebar {
    width: 160px;
    flex-shrink: 0;
    position: sticky;
    top: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.container {
    max-width: 650px;
    width: 100%;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
    text-align: center;
}

@media (max-width: 1100px) {
    .sidebar {
        display: none;
    }
}

.header h1 {
    font-weight: 800;
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.divider {
    border: none;
    height: 1px;
    background: #e5e7eb;
    margin: 20px auto 40px;
    width: 80%;
}

.video-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    margin-bottom: 40px;
}

.btn-gradient {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    width: 100%;
    max-width: 520px;
    padding: 24px 35px;
    border-radius: 50px;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.3rem;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
    position: relative;
    overflow: hidden;
    animation: pulsate 2s infinite ease-in-out;
}

@keyframes pulsate {
    0% { transform: scale(1); box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4); }
    50% { transform: scale(1.03); box-shadow: 0 15px 45px rgba(99, 102, 241, 0.6); }
    100% { transform: scale(1); box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4); }
}

.btn-gradient:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 20px 50px rgba(99, 102, 241, 0.7);
    filter: brightness(1.1);
    animation: none;
}

.btn-gradient:active {
    transform: scale(0.98);
}

.play-icon {
    background: white;
    color: var(--primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.play-icon svg {
    width: 18px;
    height: 18px;
    margin-left: 2px;
}

.btn-text {
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.highlight {
    color: #ffd700; /* Subtle gold/yellow color for emphasis */
    text-shadow: 0 1px 2px rgba(0, 31, 63, 0.1);
}

.instruction {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 5px;
}

.content-text {
    text-align: left;
    margin-top: 40px;
}

.content-text p {
    font-size: 1.05rem;
    color: var(--text-dark);
    margin-bottom: 25px;
}

.content-text h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 30px 0 15px;
    color: var(--text-dark);
}

.content-text strong {
    font-weight: 600;
}

.ad-banner, .ad-rectangle, .ad-footer-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 40px 0 10px;
    width: 100%;
    min-height: 60px;
    overflow: hidden;
    gap: 20px;
}

.ad-rectangle {
    min-height: 250px;
}

@media (max-width: 600px) {
    .container {
        padding: 25px 20px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .btn-gradient {
        font-size: 0.95rem;
        padding: 15px 20px;
    }
}