:root {
    --text-dark: #262626;
    --text-light: #ffffff;
    --text-muted: #666666;
    --bg-white: #ffffff;
    --bg-light: #fafafa;
    --border-color: rgba(0, 0, 0, 0.1);
    
    /* Vibrant Gradients for "Instagram App Promo, Colorful Light/Shadow Gradient" style */
    --ig-brand-grad: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    --bg-glow-1: radial-gradient(circle at 10% 20%, rgba(220, 39, 67, 0.15) 0%, transparent 40%);
    --bg-glow-2: radial-gradient(circle at 90% 80%, rgba(188, 24, 136, 0.15) 0%, transparent 40%);
    --bg-glow-3: radial-gradient(circle at 50% 50%, rgba(240, 148, 51, 0.1) 0%, transparent 50%);
    
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 15px 40px rgba(220, 39, 67, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
body { background-color: var(--bg-white); color: var(--text-dark); line-height: 1.6; position: relative; overflow-x: hidden; }

/* Dynamic Glow Background */
body::before, body::after { content: ''; position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -1; pointer-events: none; }
body::before { background: var(--bg-glow-1), var(--bg-glow-2); }
body::after { background: var(--bg-glow-3); animation: pulse 8s infinite alternate; }
@keyframes pulse { 0% { opacity: 0.5; transform: scale(0.95); } 100% { opacity: 1; transform: scale(1.05); } }

a { text-decoration: none; color: inherit; transition: 0.3s ease; }
ul { list-style: none; }

/* Sticky Transparent Nav */
.nav { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); padding: 15px 5%; display: flex; justify-content: space-between; align-items: center; height: 70px; }
.nav-brand { font-size: 26px; font-weight: 800; background: var(--ig-brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; font-family: 'Comic Sans MS', cursive, sans-serif; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--text-muted); position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--text-dark); }
.nav-links a::after { content: ''; position: absolute; bottom: -5px; left: 0; width: 0; height: 2px; background: var(--ig-brand-grad); transition: 0.3s; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* Promo Hero */
.hero { text-align: center; padding: 120px 20px 80px; position: relative; }
.hero-tag { display: inline-block; padding: 6px 20px; background: var(--bg-white); border-radius: 30px; font-size: 13px; font-weight: 700; color: #dc2743; margin-bottom: 25px; box-shadow: var(--shadow-soft); text-transform: uppercase; letter-spacing: 2px; }
.hero h1 { font-size: 64px; font-weight: 900; line-height: 1.1; margin-bottom: 25px; letter-spacing: -1.5px; }
.hero h1 span { background: var(--ig-brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 18px; color: var(--text-muted); max-width: 650px; margin: 0 auto 45px; }

/* Vibrant Buttons */
.btn-group { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.btn { padding: 16px 36px; border-radius: 50px; font-size: 16px; font-weight: 700; cursor: pointer; transition: 0.3s; display: inline-flex; align-items: center; gap: 10px; }
.btn-primary { background: var(--ig-brand-grad); color: var(--text-light); box-shadow: 0 10px 25px rgba(220, 39, 67, 0.3); border: none; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 35px rgba(220, 39, 67, 0.4); }
.btn-secondary { background: var(--bg-white); color: var(--text-dark); box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
.btn-secondary:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: transparent; }

/* Stats Data */
.stats { display: flex; justify-content: center; gap: 40px; padding: 0 20px 80px; flex-wrap: wrap; }
.stat-box { text-align: center; background: rgba(255, 255, 255, 0.6); backdrop-filter: blur(10px); padding: 30px 40px; border-radius: 20px; box-shadow: var(--shadow-soft); border: 1px solid rgba(255,255,255,0.8); transition: 0.3s; min-width: 200px; }
.stat-box:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.stat-box h3 { font-size: 36px; font-weight: 900; background: var(--ig-brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 5px; }
.stat-box p { font-size: 14px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* Container Structure */
.container { max-width: 1200px; margin: 0 auto; padding: 40px 20px 100px; }
.section-title { font-size: 36px; font-weight: 800; text-align: center; margin-bottom: 60px; letter-spacing: -1px; }

/* Glassmorphism About */
.about-box { background: rgba(255, 255, 255, 0.8); backdrop-filter: blur(20px); border: 1px solid rgba(255,255,255,0.9); padding: 60px; border-radius: 24px; box-shadow: var(--shadow-soft); text-align: center; margin-bottom: 80px; position: relative; overflow: hidden; }
.about-box::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: linear-gradient(45deg, transparent, rgba(255,255,255,0.8), transparent); transform: rotate(45deg); transition: 0.8s; pointer-events: none; opacity: 0; }
.about-box:hover::before { left: 100%; opacity: 1; }
.about-box p { font-size: 17px; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }
.about-box p:last-child { margin-bottom: 0; }

/* Colorful Feature Grid */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; margin-bottom: 80px; }
.feat-card { background: var(--bg-white); padding: 40px 30px; border-radius: 20px; box-shadow: var(--shadow-soft); border: 1px solid rgba(0,0,0,0.03); transition: 0.4s; position: relative; overflow: hidden; z-index: 1; }
.feat-card::after { content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 4px; background: var(--ig-brand-grad); transform: scaleX(0); transform-origin: left; transition: 0.4s; }
.feat-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-hover); }
.feat-card:hover::after { transform: scaleX(1); }
.feat-icon { width: 60px; height: 60px; background: var(--ig-brand-grad); border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 28px; color: white; margin-bottom: 25px; box-shadow: 0 8px 20px rgba(220, 39, 67, 0.25); }
.feat-card h3 { font-size: 20px; font-weight: 800; margin-bottom: 12px; color: var(--text-dark); }
.feat-card p { font-size: 15px; color: var(--text-muted); line-height: 1.7; }

/* List Style for Guide & FAQ */
.colored-list { max-width: 900px; margin: 0 auto 80px; }
.list-item { background: var(--bg-white); padding: 30px; border-radius: 16px; box-shadow: var(--shadow-soft); margin-bottom: 25px; display: flex; gap: 25px; transition: 0.3s; align-items: flex-start; border: 1px solid transparent; }
.list-item:hover { transform: translateX(10px); border-color: rgba(220, 39, 67, 0.2); box-shadow: var(--shadow-hover); }
.list-marker { font-size: 24px; font-weight: 900; background: var(--ig-brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; min-width: 40px; }
.list-content h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; color: var(--text-dark); }
.list-content p { font-size: 15px; color: var(--text-muted); line-height: 1.7; }

/* Image Showcases */
.img-showcase { width: 100%; border-radius: 24px; box-shadow: 0 20px 50px rgba(0,0,0,0.1); margin-bottom: 80px; border: 10px solid var(--bg-white); display: block; transition: 0.5s; }
.img-showcase:hover { transform: scale(1.02); box-shadow: 0 30px 60px rgba(220, 39, 67, 0.2); }

/* Promo Footer */
.footer { background: var(--bg-white); padding: 60px 20px; text-align: center; border-top: 1px solid var(--border-color); position: relative; z-index: 10; }
.footer-links { display: flex; justify-content: center; gap: 40px; margin-bottom: 25px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); font-size: 15px; font-weight: 600; }
.footer-links a:hover { color: #dc2743; }
.footer p { color: #999; font-size: 13px; }

@media (max-width: 768px) {
    .hero h1 { font-size: 46px; }
    .btn-group { flex-direction: column; width: 100%; max-width: 300px; margin: 0 auto; }
    .btn { width: 100%; justify-content: center; }
    .list-item { flex-direction: column; gap: 15px; }
}