:root {
    --primary-color: #0088ff;
    --primary-hover: #0066cc;
    --ig-gradient: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    --bg-color: #f4f7f9;
    --card-bg: #ffffff;
    --text-main: #333333;
    --text-muted: #666666;
    --border-color: #eaeaea;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
body { background-color: var(--bg-color); color: var(--text-main); line-height: 1.6; }
a { text-decoration: none; color: inherit; }

/* Nav */
.nav { position: sticky; top: 0; background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.05); z-index: 100; display: flex; justify-content: space-between; align-items: center; padding: 15px 5%; }
.nav-brand { font-size: 24px; font-weight: bold; background: var(--ig-gradient); -webkit-background-clip: text; color: transparent; }
.nav-links a { margin-left: 20px; font-weight: 600; font-size: 15px; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary-color); }

/* Hero */
.hero { background: #fff; padding: 80px 20px; text-align: center; border-bottom: 1px solid var(--border-color); }
.hero h1 { font-size: 46px; font-weight: 800; margin-bottom: 15px; color: #111; }
.hero p { font-size: 18px; color: var(--text-muted); max-width: 700px; margin: 0 auto 30px; }
.btn-group { display: flex; justify-content: center; gap: 15px; }
.btn { padding: 15px 35px; border-radius: 8px; font-size: 18px; font-weight: bold; text-align: center; transition: all 0.2s; display: inline-flex; align-items: center; justify-content: center; }
.btn-primary { background: var(--primary-color); color: #fff; box-shadow: 0 4px 15px rgba(0,136,255,0.3); border: none; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,136,255,0.4); }
.btn-secondary { background: #f0f0f0; color: #333; }
.btn-secondary:hover { background: #e4e4e4; transform: translateY(-2px); }

/* Data Bar */
.data-bar { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; padding: 40px 20px; background: var(--ig-gradient); color: #fff; }
.data-item { text-align: center; min-width: 150px; }
.data-item h3 { font-size: 32px; font-weight: bold; margin-bottom: 5px; }
.data-item p { font-size: 14px; opacity: 0.9; }

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 60px 20px; }
.section-title { font-size: 32px; font-weight: bold; text-align: center; margin-bottom: 40px; color: #222; }
.text-center { text-align: center; }

/* Grid & Cards */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card { background: var(--card-bg); padding: 30px; border-radius: 12px; box-shadow: 0 5px 15px rgba(0,0,0,0.03); border: 1px solid var(--border-color); transition: transform 0.2s; }
.card:hover { transform: translateY(-5px); border-color: var(--primary-color); }
.card h3 { font-size: 20px; font-weight: bold; margin-bottom: 10px; color: #111; border-left: 4px solid var(--primary-color); padding-left: 10px; }
.card p { font-size: 15px; color: var(--text-muted); }

/* Img */
.img-fluid { max-width: 100%; height: auto; border-radius: 12px; display: block; margin: 0 auto; box-shadow: 0 10px 25px rgba(0,0,0,0.1); }

/* FAQ */
.faq-item { background: #fff; padding: 20px; border-radius: 8px; margin-bottom: 15px; border: 1px solid var(--border-color); }
.faq-item h3 { font-size: 18px; font-weight: bold; margin-bottom: 8px; color: #111; }
.faq-item p { color: var(--text-muted); font-size: 15px; }

/* Guide */
.guide-step { background: #fff; padding: 25px; border-radius: 12px; text-align: center; box-shadow: 0 4px 12px rgba(0,0,0,0.02); }
.guide-step h3 { font-size: 24px; color: var(--primary-color); margin-bottom: 10px; }

/* Footer */
.footer { background: #fff; padding: 40px 20px; text-align: center; border-top: 1px solid var(--border-color); }
.footer-links { margin-bottom: 20px; display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
.footer-links a { font-weight: 600; color: var(--text-muted); transition: color 0.2s; }
.footer-links a:hover { color: var(--primary-color); }
.footer p { color: #999; font-size: 13px; }