*{margin:0;padding:0;box-sizing:border-box}body{font-family:Noto Sans JP,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);color:#333;min-height:100vh}#app{min-height:100vh;display:flex;flex-direction:column}.header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:32px 16px;text-align:center;box-shadow:0 8px 24px #667eea66;position:relative;overflow:hidden}.header:before{content:"";position:absolute;top:-50%;right:-10%;width:200px;height:200px;background:#ffffff1a;border-radius:50%;animation:float 6s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(20px)}}.header h1{font-size:36px;font-weight:800;position:relative;z-index:1;letter-spacing:1px;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.main{display:flex;flex-direction:column;gap:24px;padding:24px 16px;max-width:900px;margin:0 auto;flex:1;position:relative;z-index:1}.form-section{display:flex;flex-direction:column;gap:16px;padding:24px;background:linear-gradient(135deg,#fff,#f8f9ff);border-radius:20px;box-shadow:0 10px 30px #667eea40;border:2px solid rgba(255,255,255,.6);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.form-group{display:flex;flex-direction:column;gap:8px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-group-half{margin:0}.section-title{font-size:20px;font-weight:700;margin-bottom:8px;color:#333;display:flex;align-items:center;gap:8px}.form-group label{font-weight:600;font-size:15px;color:#333;display:flex;align-items:center;gap:4px}.hint{font-size:12px;color:#667eea;margin-top:4px;opacity:.8;font-weight:500}.form-group input,.form-group textarea{padding:12px 16px;border:2px solid #e0e7ff;border-radius:12px;font-family:inherit;font-size:14px;color:#333;transition:all .3s ease;background:#fff}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 4px #667eea26;transform:translateY(-2px)}.form-group textarea{resize:vertical;min-height:100px}#shuffle-btn{padding:16px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:14px;font-size:18px;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 8px 20px #667eea4d;position:relative;overflow:hidden;letter-spacing:.5px}#shuffle-btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:#ffffff4d;transition:left .5s ease;z-index:0}#shuffle-btn:hover:not(:disabled):before{left:100%}#shuffle-btn:hover:not(:disabled){transform:translateY(-4px);box-shadow:0 12px 28px #667eea66}#shuffle-btn:active:not(:disabled){transform:translateY(-2px)}#shuffle-btn:disabled{background:linear-gradient(135deg,#ccc,#999);cursor:not-allowed;opacity:.6}.grid-section{flex:1;padding:24px;background:linear-gradient(135deg,#fff,#f8f9ff);border-radius:20px;box-shadow:0 10px 30px #667eea40;border:2px solid rgba(255,255,255,.6);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.grid-info{font-size:14px;color:#667eea;font-weight:600;margin-bottom:16px;padding:8px 12px;background:#667eea14;border-radius:8px;border-left:3px solid #667eea}#grid-info-text{font-weight:700}.seat-grid{display:grid;gap:12px;grid-template-columns:repeat(6,1fr);animation:fadeIn .5s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%{background-color:#667eea14}50%{background-color:#667eea29}to{background-color:#667eea14}}@keyframes slideIn{0%{opacity:0;transform:scale(.95) translateY(8px)}to{opacity:1;transform:scale(1) translateY(0)}}.seat-card{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:14px;box-shadow:0 6px 16px #667eea4d;padding:12px 8px;text-align:center;font-size:15px;min-height:64px;display:flex;align-items:center;justify-content:center;word-break:break-word;transition:all .3s cubic-bezier(.34,1.56,.64,1);font-weight:600;cursor:default;position:relative;perspective:1000px}.seat-card:hover{transform:translateY(-6px) scale(1.05);box-shadow:0 10px 24px #667eea66}.seat-card.flipping{transform:rotateY(90deg);opacity:.3}@media (min-width: 768px){.main{flex-direction:row;align-items:flex-start;gap:24px}.form-section{width:300px;flex-shrink:0;height:fit-content}.grid-section{flex:1}.seat-grid{grid-template-columns:repeat(auto-fill,minmax(90px,1fr));gap:12px}.seat-card{font-size:16px;min-height:70px}}@media (max-width: 767px){.header h1{font-size:32px}.header{padding:24px 16px}.main{padding:16px;gap:16px}.form-section,.grid-section{padding:16px;border-radius:16px}.seat-grid{grid-template-columns:repeat(auto-fill,minmax(70px,1fr));gap:10px}.seat-card{font-size:13px;min-height:56px;padding:10px 6px}#shuffle-btn{font-size:16px;padding:14px 20px}}