:root{--primary-color: #FF6B6B;--secondary-color: #4ECDC4;--text-color: #2C3E50;--white: #ffffff;--glass-bg: rgba(255, 255, 255, .85);--transition-speed: .3s}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Nunito,sans-serif;color:var(--text-color);overflow:hidden;-webkit-user-select:none;user-select:none;height:100vh;width:100vw}#app{position:relative;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:space-between}#video-container{position:absolute;top:0;left:0;width:100%;height:100%;z-index:-2;overflow:hidden;background:#000}.bg-video{position:absolute;top:50%;left:50%;min-width:100%;min-height:100%;width:auto;height:auto;transform:translate(-50%,-50%);object-fit:cover;opacity:0;transition:opacity 1s ease-in-out}.bg-video.active{opacity:1}#particles-container{position:absolute;top:0;left:0;width:100%;height:100%;z-index:-1;pointer-events:none;overflow:hidden}.particle{position:absolute;background:#fff9;border-radius:50%;animation:floatUp 10s linear infinite;opacity:0}@keyframes floatUp{0%{transform:translateY(100vh) scale(0);opacity:0}10%{opacity:.8}90%{opacity:.8}to{transform:translateY(-10vh) scale(1.5);opacity:0}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}header{margin-top:20px;text-align:center;z-index:10}h1{font-family:Bungee,cursive;font-size:3rem;color:var(--white);text-shadow:2px 2px 0px rgba(0,0,0,.2);margin-bottom:1rem;letter-spacing:2px}.mode-switch{background:var(--glass-bg);padding:10px;border-radius:30px;display:inline-flex;gap:10px;box-shadow:0 4px 6px #0000001a}.controls-container{display:inline-flex;justify-content:center;align-items:center;position:relative;z-index:20}#settings-btn{background:var(--glass-bg);border-radius:50%;width:44px;height:44px;padding:10px;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 6px #0000001a;color:var(--text-color);cursor:pointer;transition:all .3s cubic-bezier(.175,.885,.32,1.275);position:absolute;left:100%;margin-left:8px;top:50%;transform:translateY(-50%) scale(.5);opacity:0;pointer-events:none}#settings-btn.visible{opacity:1;pointer-events:all;transform:translateY(-50%) scale(1)}#settings-btn:hover{transform:translateY(-50%) scale(1.1) rotate(45deg);background:var(--primary-color);color:var(--white)}button{background:none;border:none;padding:10px 20px;border-radius:20px;font-family:Nunito,sans-serif;font-weight:700;font-size:1rem;cursor:pointer;transition:all .2s;color:var(--text-color)}button.active{background:var(--primary-color);color:var(--white);transform:scale(1.05)}#grade-display-area{flex-grow:1;display:flex;align-items:center;justify-content:center;width:100%;max-width:1200px;z-index:10}#grades-container{display:flex;justify-content:center;gap:20px;width:100%;padding:20px;flex-wrap:wrap}.grade-card{background:var(--glass-bg);padding:20px;border-radius:20px;text-align:center;min-width:120px;box-shadow:0 8px 16px #0000001a;transition:transform .2s;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.grade-card:hover{transform:translateY(-5px)}.grade-value{font-family:Fredoka,sans-serif;font-size:3.5rem;color:var(--primary-color);margin-bottom:5px;transition:opacity .2s ease,transform .2s ease}.grade-label{font-size:.9rem;font-weight:700;text-transform:uppercase;color:#666}#instruction-hint{margin-bottom:20px;color:var(--white);font-weight:600;text-shadow:1px 1px 3px rgba(0,0,0,.5);z-index:10}.desktop-hint{display:block}.mobile-hint{display:none}@media(max-width:768px){h1{font-size:2rem}.grade-value{font-size:2.5rem}.grade-card{padding:15px;min-width:100px}.desktop-hint{display:none}.mobile-hint{display:block}#grades-container{gap:10px}#settings-btn{margin-left:8px;width:44px;height:44px}}@media(max-width:768px)and (orientation:portrait){#video-boulder{left:-75%;transform:translateY(-50%)}}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background:#0009;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:1000;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .3s ease}.modal.visible{opacity:1;pointer-events:all}.modal.hidden{display:none}.modal-content{background:#fffffff2;padding:30px;border-radius:20px;width:90%;max-width:500px;box-shadow:0 10px 30px #0003;transform:scale(.9);transition:transform .3s cubic-bezier(.175,.885,.32,1.275)}.modal.visible .modal-content{transform:scale(1)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;border-bottom:2px solid #eee;padding-bottom:10px}.modal-header h2{font-family:Bungee,cursive;color:var(--primary-color);font-size:1.5rem}#close-modal-btn{background:transparent;color:#999;font-size:2rem;padding:0;line-height:1;width:auto;height:auto}#close-modal-btn:hover{color:var(--primary-color);transform:rotate(90deg)}.modal-desc{margin-bottom:20px;color:#666;font-size:.9rem}.options-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:15px}.scale-option{display:flex;align-items:center;gap:10px;padding:10px;background:#f5f5f5;border-radius:10px;cursor:pointer;transition:all .2s;-webkit-user-select:none;user-select:none}.scale-option:hover{background:#eee}.scale-option.disabled{opacity:.5;cursor:not-allowed}.custom-checkbox{width:20px;height:20px;border:2px solid #ddd;border-radius:5px;display:flex;align-items:center;justify-content:center;background:#fff;transition:all .2s}.scale-option input{display:none}.scale-option input:checked+.custom-checkbox{background:var(--primary-color);border-color:var(--primary-color)}.custom-checkbox:after{content:"✓";color:#fff;font-size:14px;font-weight:700;display:none}.scale-option input:checked+.custom-checkbox:after{display:block}.option-label{font-weight:600;color:var(--text-color)}