* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Arial, sans-serif; background: linear-gradient(135deg, #0c1929, #1a365d); min-height: 100vh; color: #e8e8e8; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
header { background: linear-gradient(90deg, #0077b6, #00b4d8); padding: 20px 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
.logo { font-size: 32px; font-weight: 800; color: #fff; text-decoration: none; }
nav a { color: #fff; text-decoration: none; margin-left: 25px; font-weight: 600; }
.hero { background: linear-gradient(135deg, #0077b6, #00b4d8); padding: 80px 0; text-align: center; }
.hero h1 { font-size: 52px; color: #fff; margin-bottom: 10px; }
.hero p { font-size: 22px; color: #caf0f8; }
main { padding: 50px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 25px; }
.card { background: #fff; border-radius: 20px; padding: 25px; text-align: center; box-shadow: 0 8px 30px rgba(0,0,0,0.2); transition: all 0.3s; }
.card:hover { transform: translateY(-10px); box-shadow: 0 15px 40px rgba(0,180,216,0.3); }
.card .icon { font-size: 60px; margin-bottom: 15px; }
.card h3 { color: #023e8a; font-size: 18px; margin-bottom: 10px; }
.card p { color: #666; font-size: 14px; margin-bottom: 15px; }
.card a { display: inline-block; padding: 12px 24px; background: linear-gradient(135deg, #0077b6, #00b4d8); color: #fff; text-decoration: none; border-radius: 30px; font-weight: 700; }
footer { background: #023e8a; color: #90e0ef; padding: 30px 0; text-align: center; }
.tool-page { background: #fff; border-radius: 25px; padding: 40px; margin: 30px auto; max-width: 850px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); color: #333; }
.tool-page h1 { color: #023e8a; font-size: 28px; text-align: center; margin-bottom: 10px; }
.tool-page .desc { color: #666; text-align: center; margin-bottom: 25px; }
.tool-area { background: #f0f9ff; padding: 30px; border-radius: 15px; margin: 25px 0; }
.tool-area input { padding: 14px 18px; font-size: 16px; border: 2px solid #0077b6; border-radius: 10px; width: 200px; margin: 5px; }
.tool-area select { padding: 14px 18px; font-size: 16px; border: 2px solid #0077b6; border-radius: 10px; width: 200px; margin: 5px; }
.tool-area button { padding: 14px 28px; background: linear-gradient(135deg, #0077b6, #00b4d8); color: #fff; border: none; border-radius: 30px; font-weight: 700; cursor: pointer; margin: 5px; }
.result-box { background: linear-gradient(135deg, #0077b6, #023e8a); color: #fff; padding: 25px; border-radius: 12px; margin: 20px 0; font-size: 20px; font-weight: bold; }
.rules { background: #fff3cd; padding: 20px; border-radius: 12px; margin-top: 25px; border-left: 5px solid #ffc107; }
.rules h3 { color: #856404; margin-bottom: 12px; }
.rules li { color: #666; margin-bottom: 8px; margin-left: 20px; }
.back-link { color: #0077b6; text-decoration: none; font-weight: 700; font-size: 18px; }