header{border-bottom:1px solid #e2e8f0;background-color:#f7fafc}header .container{max-width:1100px;margin:0 auto}header h1{color:#1f5fcd;background-color:#f2f5f7e8;padding:10px}.header-link,header h1{font-size:1.8rem;font-weight:700;text-align:left}.header-link{display:block;background-color:#001f3f;color:#fff;padding:1rem 1.5rem;text-decoration:none;width:100%;max-width:auto}.cgpa-calculator-container{display:flex;justify-content:center;padding:40px;background-color:#fff;min-height:80vh}.calculator-card{background:linear-gradient(135deg,hsla(0,0%,100%,.9),rgba(173,216,230,.8));-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);flex:1 1;padding:30px;margin-right:5%;border-radius:16px;box-shadow:0 8px 12px rgba(0,120,245,.1);width:100%;max-width:700px;border:1px solid hsla(0,0%,100%,.18);transition:transform .3s ease,box-shadow .3s ease}.calculator-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,115,250,.2)}.calculator-title{font-size:1.8em;color:#313b42;text-align:center;margin-bottom:30px}.section-heading{font-size:1.3em;color:#2c3e50;margin-bottom:20px;border-bottom:2px solid #eee;padding-bottom:10px}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));grid-gap:20px;gap:20px;margin-bottom:25px}.form-group{display:flex;flex-direction:column}.form-group label{font-weight:700;color:#7f8c8d;margin-bottom:8px}.form-group input[type=number],.form-group input[type=text],.form-group select{padding:12px;border:1px solid rgba(209,216,224,.6);border-radius:6px;font-size:1em;color:#333;background-color:hsla(0,0%,100%,.8);transition:border-color .3s ease}.form-group input[type=number]:focus,.form-group input[type=text]:focus,.form-group select:focus{outline:none;border-color:#c6e0f1;box-shadow:0 0 0 .2rem rgba(134,193,233,.25)}.add-course-button{background-color:#27ae60;color:#fff;padding:12px 20px;border:none;border-radius:6px;font-size:1em;cursor:pointer;transition:background-color .3s ease;width:100%;margin-bottom:20px}.add-course-button:hover{background-color:#219653}.courses-list{list-style:none;padding:0}.course-item{background-color:hsla(180,6%,97%,.7);padding:15px;border-radius:6px;margin-bottom:10px;justify-content:space-between;border:1px solid hsla(0,0%,93%,.6)}.course-info,.course-item{display:flex;align-items:center}.course-index{font-size:1em;color:#777;margin-right:15px}.course-name{font-weight:700;color:#333;margin-bottom:5px}.course-details{color:#555;font-size:.9em}.remove-course-button{background:none;color:#e74c3c;border:none;cursor:pointer;font-size:1em;transition:color .3s ease}.remove-course-button:hover{color:#c0392b}.calculate-section{display:flex;justify-content:space-between;align-items:center;margin-top:30px}.calculate-button{background-color:#46a2e0;color:#fff;padding:13px 23px;border:none;margin-top:2%;border-radius:8px;font-size:1em;cursor:pointer;transition:background-color .3s ease}.calculate-button:hover{background-color:#2980b9}.cgpa-result{text-align:right}.cgpa-label{font-size:1em;color:#7f8c8d;margin-bottom:5px}.cgpa-value{font-size:1.9em;font-weight:700;color:#27ae60}@media (max-width:768px){.cgpa-calculator-container{flex-direction:column;padding:20px 15px;align-items:center}.calculator-card{margin:0;padding:20px;width:100%;max-width:100%}.calculate-section{flex-direction:column;align-items:stretch;gap:1rem}.cgpa-result{text-align:center}}@media (max-width:480px){.calculator-title{font-size:1.5em}.section-heading{font-size:1.1em}.form-group input[type=number],.form-group input[type=text],.form-group select{font-size:.95em;padding:10px}.add-course-button,.calculate-button{font-size:.95em;padding:10px 16px}.cgpa-value{font-size:1.5em}}.error-container,.not-found-container{min-height:80vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;background-color:#f8f9fa}.error-title,.not-found-title{font-size:2.5rem;color:#2c3e50;margin-bottom:1rem;text-align:center}.error-content,.not-found-content{background-color:#fff;padding:2rem;border-radius:12px;box-shadow:0 4px 6px rgba(0,0,0,.1);text-align:center;max-width:600px;width:100%}.not-found-message{color:#666;font-size:1.2rem;margin-top:1rem}.error-actions,.not-found-actions{margin-top:2rem;text-align:center}.error-button,.not-found-button{background-color:#3498db;color:#fff;padding:.8rem 2rem;border:none;border-radius:8px;font-size:1.1rem;cursor:pointer;text-decoration:none;display:inline-block;transition:all .3s ease;box-shadow:0 2px 4px rgba(0,0,0,.1)}.error-button:hover,.not-found-button:hover{background-color:#2980b9;transform:translateY(-2px);box-shadow:0 4px 8px rgba(0,0,0,.2)}.error-button:focus,.not-found-button:focus{outline:none;box-shadow:0 0 0 3px rgba(52,152,219,.3)}.footer{position:fixed;bottom:0;left:0;width:100%;display:flex;justify-content:center;align-items:flex-end;padding:1rem;pointer-events:none}.footer-toggle{background:#000;color:#fff;width:48px;height:48px;border-radius:50%;left:47%;border:none;outline:none;font-size:1.5rem;position:relative;z-index:51;align-items:center;cursor:pointer;transition:transform .3s ease}.footer-content,.footer-toggle{pointer-events:auto;display:flex;justify-content:center}.footer-content{position:absolute;bottom:72px;width:100%;left:70%;max-width:500px;transform:translateY(100%);opacity:0;transition:all .4s ease}.footer-content.show{transform:translateY(0);opacity:1}.profile-card{background:rgba(153,211,135,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:16px;padding:1rem;border:1px solid hsla(0,0%,100%,.2);box-shadow:0 4px 20px rgba(0,0,0,.3);animation:slideUp .4s ease forwards}.profile-list,.profile-row{display:flex;flex-direction:column;gap:1rem}.profile-row{opacity:0;animation:fadeInUp .4s ease forwards;animation-delay:var(--animation-delay,0s)}.box{display:flex;align-items:center;gap:.5rem;padding:.6rem 1rem;background:#243d6300;color:#000;text-decoration:none;border-radius:10px}.box:hover{border:1px solid #000}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (max-width:640px){.footer-toggle{left:50%;transform:translateX(-50%)}.footer-content{left:23%;width:100%;max-width:100%;padding:0 1rem}.profile-card{padding:.75rem;border-radius:12px}.profile-row{flex-direction:column;gap:.75rem}.box{width:100%;justify-content:center;padding:.75rem;font-size:1rem}.box img{display:none}}@media (max-width:400px){.box{font-size:.85em;padding:.7rem}}