* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, sans-serif; background: linear-gradient(135deg, #1e3c72, #2a5298); min-height: 100vh; color: #e8e8e8; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
header { background: rgba(255,255,255,0.95); padding: 18px 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 4px 20px rgba(0,0,0,0.2); }
.logo { font-size: 28px; font-weight: 800; color: #1e3c72; text-decoration: none; }
nav a { color: #1e3c72; text-decoration: none; margin-left: 25px; font-weight: 600; }
.hero { background: linear-gradient(135deg, #1e3c72, #2a5298); padding: 70px 0; text-align: center; }
.hero h1 { font-size: 48px; color: #fff; margin-bottom: 10px; }
.hero p { font-size: 20px; color: #a8c0ff; }
main { padding: 50px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 22px; }
.card { background: #fff; border-radius: 16px; padding: 20px; text-align: center; box-shadow: 0 6px 20px rgba(0,0,0,0.15); transition: all 0.3s; }
.card:hover { transform: translateY(-8px); box-shadow: 0 12px 30px rgba(0,0,0,0.25); }
.card .icon { font-size: 42px; margin-bottom: 10px; }
.card h3 { color: #1e3c72; font-size: 16px; margin-bottom: 8px; }
.card p { color: #666; font-size: 13px; margin-bottom: 12px; }
.card a { display: inline-block; padding: 10px 20px; background: linear-gradient(135deg, #1e3c72, #2a5298); color: #fff; text-decoration: none; border-radius: 25px; font-weight: 600; }
footer { background: #1a1a2e; color: #888; padding: 25px 0; text-align: center; }
.tool-page { background: #fff; border-radius: 20px; padding: 35px; margin: 30px auto; max-width: 800px; box-shadow: 0 15px 50px rgba(0,0,0,0.2); color: #333; }
.tool-page h1 { color: #1e3c72; font-size: 24px; text-align: center; margin-bottom: 8px; }
.tool-page .desc { color: #666; text-align: center; margin-bottom: 20px; }
.tool-area { background: #f8f9fa; padding: 25px; border-radius: 12px; margin: 20px 0; }
.tool-area input { padding: 12px 16px; font-size: 16px; border: 2px solid #ddd; border-radius: 8px; width: 200px; margin: 5px; }
.tool-area select { padding: 12px 16px; font-size: 16px; border: 2px solid #ddd; border-radius: 8px; width: 200px; margin: 5px; }
.tool-area button { padding: 12px 24px; background: linear-gradient(135deg, #1e3c72, #2a5298); color: #fff; border: none; border-radius: 25px; font-weight: 600; cursor: pointer; margin: 5px; }
.result { background: #e8f4f8; padding: 20px; border-radius: 10px; margin: 20px 0; font-size: 20px; font-weight: bold; color: #1e3c72; }
.rules { background: #fff3cd; padding: 18px; border-radius: 12px; margin-top: 22px; border-left: 4px solid #ffc107; }
.rules h3 { color: #856404; margin-bottom: 10px; }
.rules li { color: #666; margin-bottom: 7px; margin-left: 18px; }
.back-link { color: #1e3c72; text-decoration: none; font-weight: 600; }
.result-box { background: #1e3c72; color: #fff; padding: 20px; border-radius: 10px; margin: 15px 0; font-size: 18px; }