:root {
    --sec-green: #00B96B;
    --sec-green-hover: #009A59;
    --sec-blue: #1A73E8;
    --bg-main: #F4F7FB;
    --bg-card: #FFFFFF;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif; }
body { background-color: var(--bg-main); color: var(--text-primary); line-height: 1.6; }
a { text-decoration: none; color: inherit; }

/* Safe Download Style Nav */
.nav { background: var(--bg-card); display: flex; justify-content: space-between; align-items: center; padding: 15px 5%; border-bottom: 2px solid var(--sec-green); position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.nav-brand { font-size: 24px; font-weight: 800; color: var(--text-primary); display: flex; align-items: center; gap: 8px; }
.nav-brand::before { content: "✓"; color: white; background: var(--sec-green); border-radius: 50%; width: 26px; height: 26px; display: inline-flex; align-items: center; justify-content: center; font-size: 16px; }
.nav-links a { margin-left: 24px; font-size: 15px; font-weight: 600; color: var(--text-secondary); transition: 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--sec-green); }

/* Security Hero */
.hero { text-align: center; padding: 80px 20px 60px; background: linear-gradient(180deg, #FFFFFF 0%, #E8F5E9 100%); border-bottom: 1px solid var(--border-color); }
.hero-shield { width: 64px; height: 64px; margin: 0 auto 20px; background: rgba(0,185,107,0.1); border-radius: 16px; display: flex; align-items: center; justify-content: center; color: var(--sec-green); font-size: 32px; font-weight: bold; }
.hero h1 { font-size: 44px; font-weight: 800; color: var(--text-primary); margin-bottom: 15px; }
.hero p { font-size: 18px; color: var(--text-secondary); max-width: 700px; margin: 0 auto 30px; font-weight: 500; }
.btn-group { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
.btn { padding: 15px 35px; border-radius: 8px; font-size: 18px; font-weight: bold; text-align: center; display: inline-flex; align-items: center; gap: 10px; transition: 0.2s; cursor: pointer; border: none; }
.btn-primary { background: var(--sec-green); color: white; box-shadow: 0 6px 15px rgba(0,185,107,0.3); }
.btn-primary:hover { background: var(--sec-green-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,185,107,0.4); }
.btn-secondary { background: white; color: var(--text-primary); border: 2px solid var(--border-color); box-shadow: 0 4px 10px rgba(0,0,0,0.02); }
.btn-secondary:hover { border-color: var(--sec-green); transform: translateY(-2px); }

/* Data Bar */
.data-bar { display: flex; justify-content: center; gap: 60px; flex-wrap: wrap; padding: 35px 20px; background: var(--bg-card); border-bottom: 1px solid var(--border-color); }
.data-item { text-align: center; }
.data-item h3 { font-size: 32px; font-weight: 800; color: var(--sec-blue); margin-bottom: 5px; }
.data-item p { font-size: 14px; font-weight: 600; color: var(--text-secondary); }

/* Common layout */
.container { max-width: 1100px; margin: 0 auto; padding: 60px 20px; }
.section-title { font-size: 30px; font-weight: 800; margin-bottom: 40px; text-align: center; color: var(--text-primary); }
.text-center { text-align: center; }

/* Feature Grid */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; }
.card { background: var(--bg-card); padding: 30px; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 4px 6px rgba(0,0,0,0.02); transition: 0.2s; position: relative; overflow: hidden; }
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(0,0,0,0.06); border-color: #BBE5B3; }
.card::before { content: ""; position: absolute; left: 0; top: 0; width: 4px; height: 100%; background: var(--sec-green); opacity: 0; transition: 0.2s; }
.card:hover::before { opacity: 1; }
.card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--text-primary); }
.card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* Image */
.img-fluid { max-width: 100%; display: block; margin: 30px auto; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 10px 30px rgba(0,0,0,0.05); }

/* Lists (FAQ & Guide) */
.list-wrapper { max-width: 850px; margin: 0 auto; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; }
.list-item { padding: 25px; border-bottom: 1px solid var(--border-color); }
.list-item:last-child { border-bottom: none; }
.list-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: var(--sec-blue); }
.list-item p { font-size: 14px; color: var(--text-secondary); }

/* Steps */
.step-container { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; margin-bottom: 40px; }
.step-item { background: var(--bg-card); padding: 25px 20px; border-radius: 12px; border: 1px solid var(--border-color); text-align: center; flex: 1; min-width: 200px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: rgba(0,185,107,0.1); color: var(--sec-green); font-size: 18px; font-weight: bold; border-radius: 50%; margin-bottom: 15px; }

/* Footer */
.footer { background: var(--bg-card); padding: 40px 20px; text-align: center; border-top: 1px solid var(--border-color); margin-top: 40px; }
.footer-links { margin-bottom: 20px; }
.footer-links a { color: var(--text-secondary); font-size: 14px; font-weight: 600; margin: 0 15px; }
.footer-links a:hover { color: var(--sec-green); }
.footer p { font-size: 13px; color: #9CA3AF; }