:root{--primary-bg:#f8fafc;--secondary-bg:#ffffff;--primary-text:#0f172a;--secondary-text:#475569;--accent-color:#4f46e5;--accent-hover:#4338ca;--border-color:#e2e8f0;--box-shadow:0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);--rounded-lg:0.75rem;--transition-duration:0.3s}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:'Poppins',sans-serif;background-color:var(--primary-bg);color:var(--primary-text);line-height:1.7;overflow-x:hidden;display:flex;flex-direction:column;min-height:100vh}.container{max-width:1100px;margin:0 auto;padding:0 20px}main{flex-grow:1}.header{background-color:var(--secondary-bg);padding:1rem 0;position:sticky;top:0;z-index:1000;box-shadow:0 2px 4px rgb(0 0 0 / .05);border-bottom:1px solid var(--border-color)}.navbar{display:flex;justify-content:space-between;align-items:center}.navbar .nav-links{display:flex;gap:1.5rem}.navbar .nav-links a{color:var(--primary-text);text-decoration:none;font-weight:500;position:relative;padding-bottom:5px}.navbar .nav-links a::after{content:'';position:absolute;width:0;height:2px;bottom:0;left:50%;transform:translateX(-50%);background-color:var(--accent-color);transition:width var(--transition-duration) ease}.navbar .nav-links a:hover::after{width:100%}.section{padding:80px 0;display:flex;align-items:center;justify-content:center}.section .container{width:100%}.section-title{text-align:center;font-size:2.5rem;margin-bottom:1rem;font-weight:700}.section-subtitle{text-align:center;font-size:1.1rem;color:var(--secondary-text);margin-bottom:3rem;max-width:600px;margin-left:auto;margin-right:auto}.btn{display:inline-block;background-color:var(--accent-color);color:#fff;padding:14px 28px;border-radius:var(--rounded-lg);text-decoration:none;font-size:1rem;font-weight:600;transition:background-color var(--transition-duration) ease,transform 0.2s ease;border:none;cursor:pointer;text-align:center}.btn:hover{background-color:var(--accent-hover);transform:translateY(-3px)}.footer{background-color:#0f172a;color:#94a3b8;text-align:center;padding:2rem 0;margin-top:auto}.form-card{background-color:var(--secondary-bg);padding:2.5rem;border-radius:var(--rounded-lg);box-shadow:var(--box-shadow);border:1px solid var(--border-color);max-width:700px;margin:0 auto;width:100%}.form-header .section-title{margin-bottom:.5rem}.form-header .section-subtitle{margin-bottom:2rem}.form-group{margin-bottom:1.5rem}label{display:block;font-weight:600;color:var(--primary-text);margin-bottom:8px;font-size:.9rem}input[type="text"],input[type="tel"],input[type="number"],input[type="email"],textarea,select{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:.5rem;box-sizing:border-box;font-family:'Poppins',sans-serif;font-size:1rem;background-color:var(--primary-bg);color:var(--primary-text);transition:border-color 0.3s,box-shadow 0.3s}input::placeholder,textarea::placeholder{color:#94a3b8}input[type="text"]:focus,input[type="tel"]:focus,input[type="number"]:focus,input[type="email"]:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px rgb(79 70 229 / .15)}textarea{resize:vertical;min-height:100px}.submit-btn{width:100%;margin-top:1rem}.upload-section{margin-bottom:1.5rem;padding:1.5rem;border:2px dashed var(--border-color);border-radius:var(--rounded-lg);background-color:var(--primary-bg);text-align:center}.payment-instruction{background-color:#eef2ff;color:#3730a3;padding:1rem;border-radius:.5rem;margin-bottom:1.5rem;font-size:.95rem;line-height:1.6;text-align:left;border-left:4px solid var(--accent-color)}.payment-instruction strong{color:var(--accent-hover)}.upload-section h3{font-weight:700;font-size:1.2rem;color:var(--primary-text);margin-bottom:.5rem}.upload-description{font-size:.9rem;color:var(--secondary-text);margin-bottom:1.5rem}.file-input-group{margin-bottom:1rem}.file-input-group span{display:block;font-weight:500;text-align:left;margin-bottom:8px}.custom-file-upload{display:flex;align-items:center;border:1px solid var(--border-color);background-color:var(--secondary-bg);border-radius:.5rem;padding:5px;cursor:pointer;transition:border-color 0.3s,box-shadow 0.3s;width:100%}.custom-file-upload:hover{border-color:var(--accent-color);box-shadow:0 0 0 3px rgb(79 70 229 / .15)}.file-upload-button{background-color:var(--accent-color);color:#fff;padding:8px 16px;border-radius:.375rem;font-weight:500;font-size:.9rem;white-space:nowrap;transition:background-color var(--transition-duration) ease}.custom-file-upload:hover .file-upload-button{background-color:var(--accent-hover)}.file-upload-text{margin-left:12px;font-size:.9rem;color:var(--secondary-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex-grow:1;text-align:left}#qrcode-container{text-align:center}#qrcode-container h2{font-size:2rem;color:#16a34a;font-weight:700;margin-bottom:.5rem}#qrcode{margin:25px auto;padding:15px;border:1px solid var(--border-color);display:inline-block;background:#fff;border-radius:var(--rounded-lg)}#qrcode img,#qrcode canvas{display:block}#qrcode-info{margin-top:10px;color:var(--primary-text);font-weight:600;font-size:1.1rem}#loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgb(15 23 42 / .8);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);display:none;justify-content:center;align-items:center;z-index:10000;flex-direction:column}#loading-overlay p{color:#fff;font-size:1.1em;font-weight:500}.spinner{border:5px solid rgb(255 255 255 / .3);border-radius:50%;border-top:5px solid #fff;width:50px;height:50px;animation:spin 1s linear infinite;margin-bottom:20px}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}@media (max-width:768px){.navbar .nav-links{display:none}.section{padding:60px 0}.section-title{font-size:2rem}.form-card{padding:1.5rem}}.slot-info-per-class{font-size:.8rem;color:var(--secondary-text);margin-top:8px;height:1.2rem}.slot-info-per-class span{font-weight:600;color:var(--primary-text)}.navbar .logo{display:flex;align-items:center;gap:15px}.navbar .logo img{height:45px;width:auto}@media (max-width:768px){.navbar .logo{gap:10px}.navbar .logo img{height:35px}}.whatsapp-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;background-color:#25d366;color:#fff;padding:12px 30px;border-radius:8px;text-decoration:none;font-weight:600;font-size:1rem;transition:background-color 0.3s ease,transform 0.2s ease;white-space:nowrap}.whatsapp-btn:hover{background-color:#128c7e;transform:translateY(-2px)}.whatsapp-btn img{width:20px;height:20px;filter:brightness(0) invert(1);flex-shrink:0}.whatsapp-btn span{line-height:1}@media (max-width:480px){.whatsapp-btn{width:100%;padding:12px 15px;font-size:.9rem}}.image-preview-modal{display:none;position:fixed;z-index:2000;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:rgb(0 0 0 / .7);backdrop-filter:blur(5px);justify-content:center;align-items:center}.image-preview-modal-content{background-color:#fefefe;margin:auto;padding:20px;border:1px solid #888;border-radius:10px;width:90%;max-width:600px;box-shadow:0 5px 15px rgb(0 0 0 / .3);position:relative;text-align:center}.image-preview-modal-content img{max-width:100%;height:auto;display:block;margin:0 auto 20px auto;border-radius:8px}.image-preview-modal-content h3{margin-bottom:15px;color:#333}.image-preview-modal-content p{font-size:.9em;color:var(--secondary-text);margin-bottom:20px;word-break:break-all}.modal-actions{display:flex;justify-content:center;gap:15px}.image-preview-close{color:#aaa;float:right;font-size:35px;font-weight:700;position:absolute;top:10px;right:20px;cursor:pointer}.image-preview-close:hover,.image-preview-close:focus{color:#000;text-decoration:none;cursor:pointer}.image-preview-confirm-btn{background-color:#4CAF50;color:#fff;padding:10px 20px;border:none;border-radius:5px;cursor:pointer;font-size:1em}.image-preview-confirm-btn:hover{background-color:#45a049}.image-preview-cancel-btn{background-color:#f44336;color:#fff;padding:10px 20px;border:none;border-radius:5px;cursor:pointer;font-size:1em}.image-preview-cancel-btn:hover{background-color:#da190b}.custom-modal{display:none;position:fixed;z-index:2000;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:rgb(15 23 42 / .6);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);justify-content:center;align-items:center;padding:20px}.custom-modal-content{background-color:var(--secondary-bg);margin:auto;padding:2.5rem;border-radius:var(--rounded-lg);width:100%;max-width:500px;box-shadow:var(--box-shadow);position:relative;text-align:center;animation:modal-fade-in 0.4s}@keyframes modal-fade-in{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.custom-modal-close{color:#aaa;position:absolute;top:1rem;right:1.5rem;font-size:32px;font-weight:700;cursor:pointer;line-height:1}.custom-modal-close:hover,.custom-modal-close:focus{color:var(--primary-text)}.custom-modal-body .modal-icon-wrapper{width:80px;height:80px;margin:0 auto 1.5rem auto;border-radius:50%;background-color:#eef2ff;display:flex;align-items:center;justify-content:center;color:var(--accent-color)}.custom-modal-title{font-size:1.75rem;font-weight:700;color:var(--primary-text);margin-bottom:.75rem}.custom-modal-text{font-size:1rem;color:var(--secondary-text);margin-bottom:1.5rem}.rekening-info{background-color:var(--primary-bg);border:1px dashed var(--border-color);border-radius:.5rem;padding:1rem;margin-bottom:1.5rem}.rekening-info .bank-name{font-weight:600;color:var(--primary-text)}.rekening-info .rekening-number{font-size:1.5rem;font-weight:700;color:var(--accent-color);letter-spacing:1px;margin:.25rem 0}.rekening-info .rekening-name{font-size:1rem;color:var(--secondary-text)}.custom-modal-note{font-size:.9rem;color:var(--secondary-text);line-height:1.6}