:root {
    --ig-orange: #f09433;
    --ig-magenta: #dc2743;
    --ig-purple: #cc2366;
    --bg-light: #f5f5f7;
    --bg-white: #ffffff;
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    --border-color: #e5e5ea;
    --shadow-sm: 0 4px 6px rgba(0,0,0,0.04);
    --shadow-md: 0 10px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.12);
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
body { background: var(--bg-light); color: var(--text-main); line-height: 1.5; }
a { text-decoration: none; color: inherit; transition: 0.3s; }

/* Nav */
.nav { background: rgba(255,255,255,0.8); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; display: flex; justify-content: space-between; align-items: center; padding: 15px 5%; height: 60px; }
.nav-brand { font-size: 22px; font-weight: 700; letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-muted); }
.nav-links a:hover, .nav-links a.active { color: var(--text-main); }
.nav-btn { background: var(--text-main); color: white !important; padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; }
.nav-btn:hover { background: var(--text-muted); }

/* Stacked Hero */
.hero { padding: 80px 20px; display: flex; justify-content: center; overflow: hidden; }
.hero-stack { position: relative; max-width: 800px; width: 100%; height: 500px; }
.card-stack { position: absolute; border-radius: 24px; box-shadow: var(--shadow-lg); transition: 0.5s; background: var(--bg-white); }
.card-back { top: 20px; left: 5%; right: 5%; height: 100%; transform: scale(0.9) translateY(40px); opacity: 0.5; background: linear-gradient(135deg, var(--ig-orange), var(--ig-magenta)); z-index: 1; }
.card-mid { top: 10px; left: 2.5%; right: 2.5%; height: 100%; transform: scale(0.95) translateY(20px); opacity: 0.8; background: linear-gradient(135deg, var(--ig-magenta), var(--ig-purple)); z-index: 2; }
.card-front { top: 0; left: 0; right: 0; height: 100%; z-index: 3; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 40px; border: 1px solid var(--border-color); }
.hero-stack:hover .card-back { transform: scale(0.9) translateY(20px); }
.hero-stack:hover .card-mid { transform: scale(0.95) translateY(10px); }
.hero h1 { font-size: 48px; font-weight: 800; letter-spacing: -1px; margin-bottom: 20px; }
.hero p { font-size: 18px; color: var(--text-muted); max-width: 500px; margin-bottom: 30px; }
.btn-group { display: flex; gap: 15px; }
.btn { padding: 12px 24px; border-radius: 12px; font-size: 15px; font-weight: 600; cursor: pointer; border: none; }
.btn-primary { background: linear-gradient(45deg, var(--ig-orange), var(--ig-magenta)); color: white; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--bg-light); color: var(--text-main); }
.btn-secondary:hover { background: #e5e5ea; transform: translateY(-2px); }

/* Stacked Stats */
.stats { display: flex; justify-content: center; gap: 30px; padding: 0 20px 80px; flex-wrap: wrap; margin-top: -30px; position: relative; z-index: 10; }
.stat-box { background: var(--bg-white); border-radius: 16px; padding: 20px 30px; text-align: center; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); min-width: 200px; }
.stat-box h3 { font-size: 28px; font-weight: 700; margin-bottom: 5px; color: var(--ig-magenta); }
.stat-box p { font-size: 13px; color: var(--text-muted); font-weight: 500; }

/* Container */
.container { max-width: 1000px; margin: 0 auto; padding: 0 20px 80px; }
.section-title { font-size: 32px; font-weight: 700; text-align: center; margin-bottom: 50px; letter-spacing: -0.5px; }

/* Stacked About */
.about-stack { position: relative; margin-bottom: 80px; }
.about-box { background: var(--bg-white); border-radius: 24px; padding: 50px; box-shadow: var(--shadow-md); border: 1px solid var(--border-color); position: relative; z-index: 2; text-align: center; }
.about-box::after { content: ''; position: absolute; top: 15px; left: 15px; right: -15px; bottom: -15px; border-radius: 24px; background: rgba(220, 39, 67, 0.05); z-index: -1; }
.about-box p { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; line-height: 1.6; }
.about-box p:last-child { margin-bottom: 0; }

/* Grid Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; margin-bottom: 80px; }
.card { background: var(--bg-white); border-radius: 20px; padding: 30px; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); transition: 0.3s; }
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.card-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--bg-light); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 20px; }
.card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.card p { font-size: 14px; color: var(--text-muted); }

/* Image Display */
.showcase-img { width: 100%; border-radius: 24px; box-shadow: var(--shadow-md); margin-bottom: 80px; border: 1px solid var(--border-color); }

/* Stacked List */
.list-wrapper { max-width: 700px; margin: 0 auto 80px; }
.list-item { background: var(--bg-white); border-radius: 16px; padding: 25px; margin-bottom: -10px; position: relative; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); transition: 0.3s; }
.list-item:nth-child(1) { z-index: 4; }
.list-item:nth-child(2) { z-index: 3; }
.list-item:nth-child(3) { z-index: 2; }
.list-item:nth-child(4) { z-index: 1; margin-bottom: 0; }
.list-item:hover { transform: translateY(-10px); z-index: 10; box-shadow: var(--shadow-md); }
.list-item h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; display: flex; gap: 10px; align-items: center; }
.list-item h3 span { color: var(--ig-magenta); font-size: 14px; }
.list-item p { font-size: 14px; color: var(--text-muted); padding-left: 28px; }

/* Footer */
.footer { padding: 40px 20px; text-align: center; border-top: 1px solid var(--border-color); }
.footer-links { display: flex; justify-content: center; gap: 20px; margin-bottom: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); font-size: 13px; }
.footer-links a:hover { color: var(--text-main); }
.footer p { color: #aaa; font-size: 12px; }