:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #FAFAFA;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --border-color: #EEEEEE;
    
    /* Gradient sphere colors */
    --sphere-pink: #FF3366;
    --sphere-purple: #9933FF;
    --sphere-orange: #FF6633;
    
    --ig-gradient: linear-gradient(135deg, var(--sphere-orange), var(--sphere-pink), var(--sphere-purple));
    
    --card-shadow: 0 10px 40px rgba(0,0,0,0.08);
}

* { 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-primary); color: var(--text-primary); line-height: 1.6; overflow-x: hidden; position: relative; }

/* Gradient Spheres Background */
body::before {
    content: '';
    position: absolute;
    top: -10%; left: -5%;
    width: 50vw; height: 50vw;
    background: radial-gradient(circle, rgba(255,51,102,0.15) 0%, transparent 60%);
    z-index: -1; pointer-events: none;
}
body::after {
    content: '';
    position: absolute;
    top: 20%; right: -10%;
    width: 60vw; height: 60vw;
    background: radial-gradient(circle, rgba(153,51,255,0.12) 0%, transparent 60%);
    z-index: -1; pointer-events: none;
}
.bg-sphere-3 {
    position: absolute;
    bottom: -10%; left: 20%;
    width: 70vw; height: 70vw;
    background: radial-gradient(circle, rgba(255,102,51,0.1) 0%, transparent 60%);
    z-index: -1; pointer-events: none;
}

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

/* Navbar */
.nav { background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border-color); padding: 15px 5%; display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 1000; height: 70px; }
.nav-brand { font-size: 24px; font-weight: 800; background: var(--ig-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 40px; }
.nav-links a { font-size: 14px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -5px; left: 0; width: 100%; height: 2px; background: var(--ig-gradient); transform: scaleX(0); transition: 0.3s; }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }

/* Hero */
.hero { text-align: center; padding: 120px 20px 80px; max-width: 1000px; margin: 0 auto; position: relative; }
.hero h1 { font-size: 64px; font-weight: 800; line-height: 1.1; margin-bottom: 24px; letter-spacing: -2px; }
.hero h1 span { color: var(--sphere-pink); }
.hero p { font-size: 20px; color: var(--text-secondary); margin-bottom: 40px; font-weight: 400; max-width: 700px; margin-inline: auto; }

.btn-group { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 10; }
.btn { padding: 16px 40px; border-radius: 50px; font-size: 15px; font-weight: 700; cursor: pointer; transition: 0.3s; display: inline-flex; align-items: center; justify-content: center; box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.btn-primary { background: var(--ig-gradient); color: #fff; border: none; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 30px rgba(255,51,102,0.3); }
.btn-secondary { background: #fff; color: var(--text-primary); border: 2px solid var(--border-color); }
.btn-secondary:hover { border-color: var(--text-primary); transform: translateY(-3px); }

/* Stats */
.stats { display: flex; justify-content: center; gap: 40px; padding: 0 20px 100px; flex-wrap: wrap; max-width: 1200px; margin: 0 auto; }
.stat-box { text-align: center; }
.stat-box h3 { font-size: 48px; font-weight: 800; margin-bottom: 5px; color: var(--text-primary); }
.stat-box p { font-size: 14px; color: var(--sphere-purple); font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }

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

/* About Panel */
.about-panel { background: rgba(255,255,255,0.8); backdrop-filter: blur(20px); border: 1px solid var(--border-color); padding: 60px; border-radius: 30px; text-align: center; margin-bottom: 120px; box-shadow: var(--card-shadow); }
.about-panel p { font-size: 18px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; max-width: 800px; margin-inline: auto; font-weight: 400; }
.about-panel p:last-child { margin-bottom: 0; }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 40px; margin-bottom: 120px; }
.feature-card { background: #fff; padding: 40px; border-radius: 24px; box-shadow: var(--card-shadow); transition: 0.3s; border: 1px solid var(--border-color); text-align: center; position: relative; overflow: hidden; }
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 6px; background: var(--ig-gradient); opacity: 0; transition: 0.3s; }
.feature-card:hover { transform: translateY(-10px); }
.feature-card:hover::before { opacity: 1; }
.feature-icon { font-size: 40px; margin-bottom: 20px; display: inline-block; }
.feature-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 15px; }
.feature-card p { font-size: 16px; color: var(--text-secondary); line-height: 1.6; }

/* Visual Showcase */
.showcase-block { position: relative; margin-bottom: 120px; border-radius: 30px; overflow: hidden; box-shadow: var(--card-shadow); background: #fff; padding: 20px; }
.showcase-img { width: 100%; display: block; border-radius: 20px; }

/* Guide */
.guide-container { max-width: 1000px; margin: 0 auto 120px; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; }
.guide-step { background: #fff; border: 1px solid var(--border-color); padding: 40px 30px; border-radius: 24px; text-align: center; box-shadow: var(--card-shadow); transition: 0.3s; }
.guide-step:hover { transform: translateY(-5px); border-color: var(--sphere-purple); }
.step-num { width: 60px; height: 60px; background: var(--bg-secondary); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: 800; color: var(--sphere-pink); margin: 0 auto 20px; }
.guide-step h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.guide-step p { font-size: 14px; color: var(--text-secondary); }

/* FAQ */
.faq-container { max-width: 800px; margin: 0 auto 100px; background: #fff; padding: 40px; border-radius: 30px; box-shadow: var(--card-shadow); border: 1px solid var(--border-color); }
.faq-item { border-bottom: 1px solid var(--border-color); padding: 30px 0; }
.faq-item:first-child { padding-top: 0; }
.faq-item:last-child { border-bottom: none; padding-bottom: 0; }
.faq-q { font-size: 20px; font-weight: 700; margin-bottom: 15px; color: var(--text-primary); }
.faq-a { font-size: 16px; color: var(--text-secondary); line-height: 1.8; }

/* Footer */
.footer { background: var(--bg-secondary); padding: 80px 20px 40px; text-align: center; }
.footer-brand { font-size: 32px; font-weight: 800; background: var(--ig-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 30px; display: inline-block; }
.footer-links { display: flex; justify-content: center; gap: 40px; margin-bottom: 40px; flex-wrap: wrap; }
.footer-links a { color: var(--text-secondary); font-size: 15px; font-weight: 600; }
.footer-links a:hover { color: var(--text-primary); }
.footer-copy { color: #999; font-size: 14px; border-top: 1px solid var(--border-color); padding-top: 30px; max-width: 1200px; margin: 0 auto; }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 42px; }
    .btn-group { flex-direction: column; padding: 0 20px; }
    .btn { width: 100%; }
    .stats { gap: 20px; }
    .stat-box h3 { font-size: 36px; }
    .about-panel { padding: 40px 20px; }
    .guide-container { grid-template-columns: 1fr; }
    .faq-container { padding: 30px 20px; }
}