* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: linear-gradient(135deg, #0a0e27 0%, #1a1a3e 50%, #0d1b2a 100%);
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    color: #f0f0f0;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 20% 50%, rgba(100, 200, 255, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 80%, rgba(200, 100, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    font-family: inherit;
    position: relative;
    z-index: 1;
}

h1 {
    text-align: center;
    color: #ffffff;
    font-size: 2.5em;
    font-weight: 300;
    letter-spacing: 1px;
    margin-bottom: 40px;
    background: linear-gradient(135deg, #64c8ff 0%, #c864ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Notification Popup System */
.notification-popup {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    animation: slideInRight 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

.notification-popup.hidden {
    display: none;
}

.notification-popup.exit {
    animation: slideOutRight 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.notification-content {
    background: rgba(20, 30, 60, 0.9);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 16px;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    min-width: 280px;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.notification-message {
    color: #64c8ff;
    font-size: 0.95em;
    font-weight: 400;
    line-height: 1.4;
    letter-spacing: 0.3px;
    flex: 1;
}

.notification-popup.warning .notification-message {
    color: #ffb74d;
}

.notification-popup.error .notification-message {
    color: #ff6b6b;
}

.notification-popup.success .notification-message {
    color: #4caf50;
}

.notification-close {
    background: rgba(100, 200, 255, 0.1);
    border: 1px solid rgba(100, 200, 255, 0.2);
    color: #64c8ff;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2em;
    font-weight: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    padding: 0;
    flex-shrink: 0;
}

.notification-close:hover {
    background: rgba(100, 200, 255, 0.2);
    border-color: rgba(100, 200, 255, 0.4);
    color: #ffffff;
}

/* Confirmation Modal */
.confirmation-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.confirmation-modal.hidden {
    display: none !important;
}

.confirmation-content {
    background: rgba(20, 30, 60, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(100, 200, 255, 0.3);
    border-radius: 24px;
    padding: 32px;
    min-width: 320px;
    max-width: 450px;
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.5);
    text-align: center;
    animation: fadeInScale 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

#confirmation-message {
    color: #f0f0f0;
    font-size: 1.1em;
    font-weight: 400;
    letter-spacing: 0.3px;
    margin-bottom: 24px;
    line-height: 1.5;
}

.confirmation-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn-confirm, .btn-cancel {
    padding: 10px 24px;
    font-size: 0.95em;
    font-weight: 500;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 100px;
    position: relative;
    z-index: 10001;
}

.btn-confirm {
    background: linear-gradient(135deg, #64c8ff 0%, #4db8ff 100%);
    color: #0a0e27;
    border: 1px solid rgba(100, 200, 255, 0.4);
}

.btn-confirm:hover {
    background: linear-gradient(135deg, #4db8ff 0%, #3da8ff 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(100, 200, 255, 0.3);
}

.btn-cancel {
    background: rgba(100, 200, 255, 0.1);
    color: #64c8ff;
    border: 1px solid rgba(100, 200, 255, 0.2);
}

.btn-cancel:hover {
    background: rgba(100, 200, 255, 0.15);
    border-color: rgba(100, 200, 255, 0.4);
}

.view {
    display: block;
}

.view.hidden {
    display: none;
}

.hidden {
    display: none !important;
}

/* Glassmorphism Base */
.glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
}

/* Dashboard Styles */
#cgpa-stats {
    display: flex;
    gap: 20px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.stat-card {
    flex: 1;
    min-width: 200px;
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    cursor: default;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    background: rgba(100, 200, 255, 0.08);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(100, 200, 255, 0.15);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(100, 200, 255, 0.3) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.stat-card:hover {
    background: rgba(100, 200, 255, 0.12);
    border-color: rgba(100, 200, 255, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(100, 200, 255, 0.15);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card h3 {
    margin: 0 0 15px 0;
    font-size: 0.9em;
    opacity: 0.8;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    font-weight: 500;
    color: #a0d8ff;
}

.stat-card p {
    margin: 0;
    font-size: 2.8em;
    font-weight: 300;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #64c8ff 0%, #c864ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#semester-list {
    margin: 30px 0;
}

.semester-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 1fr;
    gap: 20px;
    margin: 30px 0;
}

.semester-card {
    padding: 25px;
    border-radius: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    background: rgba(100, 200, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(100, 200, 255, 0.1);
}

.semester-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.1) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.semester-card:hover {
    background: rgba(100, 200, 255, 0.1);
    border-color: rgba(100, 200, 255, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(100, 200, 255, 0.2);
}

.semester-card.filled {
    border-color: rgba(100, 200, 255, 0.2);
}

.semester-card.filled:hover {
    background: rgba(100, 200, 255, 0.12);
}

.semester-card.has-backs {
    border-color: rgba(220, 53, 69, 0.2);
    background: rgba(220, 53, 69, 0.05);
}

.semester-card.has-backs:hover {
    background: rgba(220, 53, 69, 0.1);
    border-color: rgba(220, 53, 69, 0.3);
    box-shadow: 0 20px 40px rgba(220, 53, 69, 0.15);
}

.semester-card.empty {
    border-style: dashed;
    border-color: rgba(100, 200, 255, 0.2);
    opacity: 0.9;
}

.semester-card.empty:hover {
    border-color: rgba(100, 200, 255, 0.4);
    background: rgba(100, 200, 255, 0.08);
}

.semester-card h4 {
    margin: 0 0 15px 0;
    color: #ffffff;
    font-size: 1em;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.semester-card .sem-cgpa {
    margin: 15px 0 10px 0;
    font-size: 2.2em;
    font-weight: 300;
    background: linear-gradient(135deg, #64c8ff 0%, #c864ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.semester-card .sem-courses {
    margin: 10px 0;
    color: #b0b0b0;
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

.semester-card .empty-text {
    margin: 10px 0;
    color: #64c8ff;
    font-style: italic;
    font-weight: 400;
    font-size: 0.9em;
    opacity: 0.8;
}

.back-indicator {
    margin: 10px 0 0 0;
    color: #ff6b6b;
    font-weight: 500;
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

/* Backs Section */
#backs-section {
    background: rgba(255, 107, 107, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 107, 107, 0.15);
    border-radius: 20px;
}


.semester-card h4 {
    margin: 0 0 15px 0;
    color: #ffffff;
    font-size: 1em;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.semester-card .sem-cgpa {
    margin: 15px 0 10px 0;
    font-size: 2.2em;
    font-weight: 300;
    background: linear-gradient(135deg, #64c8ff 0%, #c864ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.semester-card .sem-courses {
    margin: 10px 0;
    color: #b0b0b0;
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

.semester-card .empty-text {
    margin: 10px 0;
    color: #64c8ff;
    font-style: italic;
    font-weight: 400;
    font-size: 0.9em;
    opacity: 0.8;
}

.back-indicator {
    margin: 10px 0 0 0;
    color: #ff6b6b;
    font-weight: 500;
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

/* Backs Section */
#backs-section {
    background: rgba(255, 107, 107, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 107, 107, 0.15);
    border-radius: 20px;
    padding: 20px;
    margin: 30px 0;
}

#backs-section h3 {
    margin-top: 0;
    color: #856404;
}

#backs-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}

.back-card {
    background: white;
    border-left: 4px solid #dc3545;
    border-radius: 4px;
    padding: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.back-card:hover {
    box-shadow: 0 4px 8px rgba(220, 53, 69, 0.15);
    transform: translateY(-2px);
}

.back-info h4 {
    margin: 0 0 10px 0;
    color: #dc3545;
    font-size: 1.1em;
}

.back-info p {
    margin: 8px 0;
    color: #666;
}

.clear-sem {
    background: #d4edda;
    padding: 8px 12px;
    border-radius: 4px;
    color: #155724;
    font-weight: bold;
    margin-top: 10px;
}

.clear-sem.no-clear {
    background: #f8d7da;
    color: #721c24;
}

/* Form View Styles */
#form-view h2 {
    margin-top: 0;
    color: #ffffff;
    border-bottom: 1px solid rgba(100, 200, 255, 0.2);
    padding-bottom: 20px;
    font-size: 1.8em;
    font-weight: 300;
    letter-spacing: 0.5px;
}

#semester-info {
    margin-bottom: 30px;
    padding: 25px;
    background: rgba(100, 200, 255, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-left: 3px solid rgba(100, 200, 255, 0.3);
    border-radius: 16px;
    border: 1px solid rgba(100, 200, 255, 0.1);
}

#semester-info label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #b0d4ff;
    letter-spacing: 0.5px;
}

#semester-info input {
    width: 100%;
    padding: 12px 16px;
    margin-bottom: 15px;
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    font-size: 1em;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    color: #ffffff;
    transition: all 0.3s ease;
}

#semester-info input:focus {
    outline: none;
    border-color: rgba(100, 200, 255, 0.5);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

#course-form {
    margin-bottom: 30px;
    padding: 25px;
    border: 1px solid rgba(100, 200, 255, 0.1);
    border-radius: 16px;
    background: rgba(100, 200, 255, 0.04);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#course-form label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #b0d4ff;
    letter-spacing: 0.5px;
}

#course-form input, #course-form select {
    width: 100%;
    margin-bottom: 15px;
    padding: 12px 16px;
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    box-sizing: border-box;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-size: 0.95em;
    transition: all 0.3s ease;
}

#course-form input:focus, #course-form select:focus {
    outline: none;
    border-color: rgba(100, 200, 255, 0.5);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

#course-form select {
    cursor: pointer;
}

#lab-inputs {
    display: none;
}

#course-list {
    list-style: none;
    padding: 0;
    margin-bottom: 20px;
    border: 1px solid rgba(100, 200, 255, 0.1);
    border-radius: 16px;
    overflow: hidden;
    background: rgba(100, 200, 255, 0.04);

}

#course-list li {
    background: white;
    border-bottom: 1px solid #eee;
    margin-bottom: 0;
    padding: 15px;
    border-radius: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

#course-list li:last-child {
    border-bottom: none;
}

#course-list li:hover {
    background: #f8f9fa;
}

#course-list li[style*="background: rgb(255, 204, 204)"] {
    background: #ffe6e6 !important;
    border-left: 4px solid #dc3545;
}

#course-list button {
    background: #dc3545;
    padding: 5px 10px;
    font-size: 0.9em;
}

#course-list button:hover {
    background: #c82333;
}

/* Button Styles */
button {
    padding: 12px 24px;
    background: rgba(100, 200, 255, 0.1);
    color: #64c8ff;
    border: 1px solid rgba(100, 200, 255, 0.3);
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    margin-right: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.5px;
}

button:hover {
    background: rgba(100, 200, 255, 0.15);
    border-color: rgba(100, 200, 255, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(100, 200, 255, 0.2);
    color: #ffffff;
}

button:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.12) 0%, rgba(200, 100, 255, 0.08) 100%);
    border: 1px solid rgba(100, 200, 255, 0.3);
    color: #64c8ff;
    width: 100%;
    margin-top: 15px;
    margin-right: 0;
}

.btn-primary:hover {
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.18) 0%, rgba(200, 100, 255, 0.12) 100%);
    border-color: rgba(100, 200, 255, 0.5);
    color: #ffffff;
    box-shadow: 0 15px 40px rgba(100, 200, 255, 0.25);
}

.btn-secondary {
    background: rgba(100, 130, 160, 0.1);
    border: 1px solid rgba(100, 130, 160, 0.3);
    color: #a0d8ff;
    width: 100%;
    margin-top: 15px;
    margin-right: 0;
}

.btn-secondary:hover {
    background: rgba(100, 130, 160, 0.15);
    border-color: rgba(100, 130, 160, 0.5);
    color: #ffffff;
}

.btn-view {
    background: rgba(100, 200, 255, 0.1);
    border: 1px solid rgba(100, 200, 255, 0.3);
    color: #64c8ff;
    padding: 8px 16px;
    font-size: 0.85em;
    width: auto;
    margin: 5px 5px 5px 0;
}

.btn-view:hover {
    background: #218838;
}

.btn-delete {
    background: #dc3545;
    padding: 5px 10px;
    font-size: 0.9em;
    width: auto;
    margin: 0;
}

.btn-delete:hover {
    background: #c82333;
}

#add-course {
    width: auto;
    background: #28a745;
    margin-bottom: 10px;
    transition: all 0.2s ease;
}

#add-course:hover {
    background: #218838;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#calculate-cgpa {
    background: #667eea;
    width: 100%;
    margin-top: 15px;
    margin-right: 0;
    font-weight: 600;
}

#calculate-cgpa:hover {
    background: #5568d3;
}

/* Modal Styles */
.modal {
    display: flex;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: rgba(15, 25, 50, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid rgba(100, 200, 255, 0.15);
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    position: relative;
    animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-btn {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.5);
    background: rgba(100, 200, 255, 0.05);
    border: 1px solid rgba(100, 200, 255, 0.1);
    cursor: pointer;
    padding: 5px 12px;
    width: auto;
    margin: 0;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.close-btn:hover {
    color: rgba(255, 255, 255, 0.8);
    background: rgba(100, 200, 255, 0.15);
    border-color: rgba(100, 200, 255, 0.3);
}

#modal-sem-title {
    margin-top: 0;
    color: #ffffff;
    font-size: 1.6em;
    font-weight: 300;
}

#modal-courses {
    margin: 25px 0;
}

.modal-course {
    background: rgba(100, 200, 255, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-left: 3px solid rgba(100, 200, 255, 0.3);
    border-radius: 12px;
    border: 1px solid rgba(100, 200, 255, 0.1);
    padding: 18px;
    margin-bottom: 15px;
}

.modal-course.back-course {
    background: rgba(220, 53, 69, 0.08);
    border-left-color: rgba(220, 53, 69, 0.3);
    border-color: rgba(220, 53, 69, 0.1);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.course-header h4 {
    margin: 0;
    color: #ffffff;
    font-weight: 500;
    font-size: 0.95em;
}

.course-grade {
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.15) 0%, rgba(200, 100, 255, 0.1) 100%);
    color: #64c8ff;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.85em;
    border: 1px solid rgba(100, 200, 255, 0.2);
}

.back-badge {
    background: rgba(220, 53, 69, 0.15);
    color: #ff6b6b;
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.8em;
    border: 1px solid rgba(220, 53, 69, 0.2);
}

.course-details {
    font-size: 0.9em;
    color: #b0d4ff;
}

.course-details p {
    margin: 5px 0;
    line-height: 1.4;
}

.modal-footer {
    border-top: 1px solid rgba(100, 200, 255, 0.1);
    padding-top: 20px;
    margin-top: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

#modal-cgpa {
    margin: 0;
    font-size: 1.1em;
    color: #64c8ff;
    font-weight: 300;
}

/* Semester Detail View Styles */
.semester-detail-view {
    display: none;
    padding: 40px 0;
    width: 100%;
    max-width: 100%;
    overflow-y: auto;
}

.semester-detail-view.active {
    display: block;
}

.semester-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(100, 200, 255, 0.2);
    gap: 40px;
}

.semester-header h2 {
    margin: 0;
    color: #ffffff;
    font-size: 2.2em;
    font-weight: 300;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #64c8ff 0%, #c864ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.semester-nav {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: flex-end;
}

.btn-back-dashboard {
    background: rgba(100, 130, 160, 0.1);
    color: #a0d8ff;
    padding: 12px 24px;
    border: 1px solid rgba(100, 130, 160, 0.3);
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.95em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.btn-back-dashboard:hover {
    background: rgba(100, 130, 160, 0.15);
    border-color: rgba(100, 130, 160, 0.5);
    color: #ffffff;
    transform: translateX(-3px);
    box-shadow: 0 10px 30px rgba(100, 130, 160, 0.15);
}

.sem-detail-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    margin-bottom: 0;
    margin-top: 15px;
}

.sem-stat-card {
    background: rgba(100, 200, 255, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(100, 200, 255, 0.15);
    color: #ffffff;
    padding: 20px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(100, 200, 255, 0.1);
    transition: all 0.3s ease;
}

.sem-stat-card:hover {
    background: rgba(100, 200, 255, 0.12);
    border-color: rgba(100, 200, 255, 0.3);
    transform: translateY(-5px);
}

.sem-stat-card h4 {
    margin: 0 0 10px 0;
    font-size: 0.8em;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #a0d8ff;
    font-weight: 500;
}

.sem-stat-card p {
    margin: 0;
    font-size: 2.2em;
    font-weight: 300;
    background: linear-gradient(135deg, #64c8ff 0%, #c864ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.courses-section {
    background: rgba(100, 200, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 20px;
    margin-bottom: 50px;
    border-left: 3px solid rgba(100, 200, 255, 0.3);
    border: 1px solid rgba(100, 200, 255, 0.1);
}

.courses-section h3 {
    margin-top: 0;
    color: #ffffff;
    border-bottom: 1px solid rgba(100, 200, 255, 0.1);
    padding-bottom: 15px;
    font-size: 1.2em;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.courses-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.semester-course-card {
    background: rgba(100, 200, 255, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(100, 200, 255, 0.15);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 8px 20px rgba(100, 200, 255, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.semester-course-card:hover {
    border-color: rgba(100, 200, 255, 0.3);
    box-shadow: 0 15px 40px rgba(100, 200, 255, 0.15);

    transform: translateY(-4px);
}

.course-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
    gap: 10px;
}

.course-card-title {
    flex: 1;
    font-weight: 500;
    color: #ffffff;
    font-size: 0.95em;
    letter-spacing: 0.3px;
}

.course-card-grade {
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.15) 0%, rgba(200, 100, 255, 0.1) 100%);
    color: #64c8ff;
    padding: 5px 12px;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.8em;
    border: 1px solid rgba(100, 200, 255, 0.2);
    white-space: nowrap;
}

.course-card-grade.back {
    background: rgba(220, 53, 69, 0.15);
    color: #ff6b6b;
    border-color: rgba(220, 53, 69, 0.2);
}

.course-card-info {
    font-size: 0.85em;
    color: #b0d4ff;
    margin: 12px 0;
    line-height: 1.5;
}

.course-card-info strong {
    color: #ffffff;
}

.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
    padding-top: 12px;
    border-top: 1px solid rgba(100, 200, 255, 0.1);
    gap: 10px;
}

.course-credit {
    color: #64c8ff;
    font-weight: 500;
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

.btn-delete-course {
    background: rgba(220, 53, 69, 0.1);
    color: #ff6b6b;
    border: 1px solid rgba(220, 53, 69, 0.2);
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85em;
    transition: all 0.3s ease;
}

.btn-delete-course:hover {
    background: rgba(220, 53, 69, 0.2);
    border-color: rgba(220, 53, 69, 0.4);
    color: #ffffff;
    transform: scale(1.05);
}

.add-course-section {
    background: rgba(40, 167, 69, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 20px;
    margin-top: 30px;
    margin-bottom: 50px;
    border-left: 3px solid rgba(40, 167, 69, 0.3);
    border: 1px solid rgba(40, 167, 69, 0.1);
    box-shadow: 0 8px 20px rgba(40, 167, 69, 0.08);
}

.add-course-section h3 {
    margin-top: 0;
    color: #ffffff;
    border-bottom: 1px solid rgba(40, 167, 69, 0.1);
    padding-bottom: 15px;
    font-size: 1.2em;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.add-course-form {
    display: grid;
    gap: 20px;
}

.form-group-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.form-group-row label {
    display: block;
    font-weight: 500;
    color: #b0d4ff;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.form-group-row input,
.form-group-row select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    font-size: 0.95em;
    box-sizing: border-box;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    transition: all 0.3s ease;
}

.form-group-row input:focus,
.form-group-row select:focus {
    outline: none;
    border-color: rgba(100, 200, 255, 0.5);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

.course-type-toggle {
    display: flex;
    gap: 12px;
    margin: 15px 0;
}

.course-type-btn {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid rgba(100, 200, 255, 0.2);
    background: rgba(100, 200, 255, 0.05);
    border-radius: 12px;
    cursor: pointer;
    font-weight: 500;
    color: #b0d4ff;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.5px;
}

.course-type-btn.active {
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.2) 0%, rgba(200, 100, 255, 0.15) 100%);
    color: #ffffff;
    border-color: rgba(100, 200, 255, 0.4);
    box-shadow: 0 8px 20px rgba(100, 200, 255, 0.15);
}

.course-type-btn:hover {
    border-color: rgba(100, 200, 255, 0.4);
    background: rgba(100, 200, 255, 0.08);
    color: #ffffff;
}

.lab-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.lab-fields label {
    display: block;
    font-weight: 500;
    color: #b0d4ff;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.lab-fields input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    font-size: 0.95em;
    box-sizing: border-box;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    transition: all 0.3s ease;
}

.lab-fields input:focus {
    outline: none;
    border-color: rgba(100, 200, 255, 0.5);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

.theory-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.theory-fields label {
    display: block;
    font-weight: 500;
    color: #b0d4ff;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.theory-fields input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    font-size: 0.95em;
    box-sizing: border-box;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    transition: all 0.3s ease;
}

.theory-fields input:focus {
    outline: none;
    border-color: rgba(100, 200, 255, 0.5);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.btn-add-course {
    flex: 1;
    min-width: 150px;
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.15) 0%, rgba(40, 200, 100, 0.1) 100%);
    color: #4caf50;
    padding: 14px 28px;
    border: 1px solid rgba(40, 167, 69, 0.3);
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.5px;
}

.btn-add-course:hover {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.2) 0%, rgba(40, 200, 100, 0.15) 100%);
    border-color: rgba(40, 167, 69, 0.5);
    color: #ffffff;
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(40, 167, 69, 0.25);
}

.btn-add-course:active {
    transform: translateY(0);
}

.empty-courses-message {
    text-align: center;
    color: rgba(176, 212, 255, 0.6);
    padding: 50px 30px;
    font-size: 1em;
    letter-spacing: 0.5px;
    font-weight: 300;
}

@media (max-width: 1024px) {
    .container {
        padding: 25px 15px;
    }

    h1 {
        font-size: 2em;
        margin-bottom: 30px;
    }

    #cgpa-stats {
        gap: 15px;
        margin: 25px 0;
    }

    .semester-grid {
        grid-template-columns: repeat(3, 1fr);
        grid-auto-rows: 1fr;
        gap: 15px;
    }

    .stat-card {
        padding: 25px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
        max-width: 100%;
    }

    h1 {
        font-size: 1.8em;
        margin-bottom: 25px;
    }

    /* Notification */
    .notification-content {
        min-width: 260px;
        max-width: 85vw;
    }

    /* Dashboard */
    #cgpa-stats {
        flex-direction: column;
        gap: 12px;
        margin: 20px 0;
    }

    .stat-card {
        min-width: auto;
        padding: 20px;
    }

    .stat-card h3 {
        font-size: 0.8em;
    }

    .stat-card p {
        font-size: 2.2em;
    }

    .semester-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: 1fr;
        gap: 12px;
        margin: 20px 0;
    }

    .semester-card {
        padding: 18px;
    }

    .semester-card h4 {
        font-size: 0.9em;
        margin-bottom: 12px;
    }

    .semester-card .sem-cgpa {
        font-size: 2em;
    }

    /* Backs Section */
    .back-card {
        padding: 15px;
    }

    /* Form View */
    #form-view h2 {
        font-size: 1.5em;
    }

    #semester-info {
        padding: 18px;
        margin-bottom: 20px;
    }

    #course-form {
        padding: 18px;
    }

    /* Semester Detail View */
    .semester-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
        padding-bottom: 20px;
        margin-bottom: 25px;
    }

    .semester-header h2 {
        font-size: 1.6em;
        margin-bottom: 0;
    }

    .semester-nav {
        width: 100%;
        gap: 10px;
    }

    .btn-back-dashboard {
        width: 100%;
        padding: 10px 16px;
        font-size: 0.9em;
    }

    .sem-detail-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        width: 100%;
    }

    .sem-stat-card {
        padding: 15px;
    }

    .sem-stat-card h4 {
        font-size: 0.75em;
    }

    .sem-stat-card p {
        font-size: 1.8em;
    }

    .courses-section {
        padding: 20px;
        margin-bottom: 20px;
    }

    .courses-section h3 {
        font-size: 1em;
        padding-bottom: 12px;
    }

    .courses-list {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .semester-course-card {
        padding: 15px;
    }

    .course-card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .course-card-grade {
        align-self: flex-start;
    }

    .add-course-section {
        padding: 20px;
        margin-bottom: 20px;
    }

    .add-course-section h3 {
        font-size: 1em;
    }

    .add-course-form {
        gap: 15px;
    }

    .form-group-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .form-group-row label {
        font-size: 0.9em;
    }

    .form-group-row input,
    .form-group-row select {
        padding: 11px 14px;
        font-size: 0.9em;
    }

    .course-type-toggle {
        gap: 10px;
    }

    .course-type-btn {
        padding: 10px 14px;
        font-size: 0.9em;
    }

    .lab-fields {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .lab-fields label {
        font-size: 0.9em;
    }

    .lab-fields input {
        padding: 11px 14px;
        font-size: 0.9em;
    }

    .theory-fields {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .theory-fields label {
        font-size: 0.9em;
    }

    .theory-fields input {
        padding: 11px 14px;
        font-size: 0.9em;
    }

    .form-actions {
        margin-top: 20px;
        gap: 10px;
    }

    .btn-add-course {
        padding: 12px 20px;
        font-size: 0.9em;
    }

    /* Modal */
    .modal-content {
        width: 90vw;
        max-width: 100%;
        padding: 30px 20px;
        border-radius: 20px;
    }

    #modal-sem-title {
        font-size: 1.4em;
    }

    .modal-course {
        padding: 15px;
    }

    .modal-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    /* Buttons */
    button {
        padding: 10px 18px;
        font-size: 0.9em;
    }

    .btn-primary, .btn-secondary {
        margin-top: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 16px 12px;
    }

    h1 {
        font-size: 1.4em;
        margin-bottom: 20px;
    }

    /* Notification */
    .notification-popup {
        top: 15px;
        right: 15px;
        left: 15px;
    }

    .notification-content {
        min-width: auto;
        max-width: 100%;
        padding: 14px 16px;
    }

    .notification-message {
        font-size: 0.9em;
    }

    .notification-close {
        width: 28px;
        height: 28px;
        font-size: 1em;
    }

    /* Dashboard */
    #cgpa-stats {
        flex-direction: column;
        gap: 10px;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-card h3 {
        font-size: 0.75em;
        margin-bottom: 8px;
    }

    .stat-card p {
        font-size: 2em;
    }

    .semester-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: 1fr;
        gap: 10px;
    }

    .semester-card {
        padding: 15px;
    }

    .semester-card h4 {
        font-size: 0.85em;
        margin-bottom: 10px;
    }

    .semester-card .sem-cgpa {
        font-size: 1.8em;
    }

    .semester-card .sem-courses {
        font-size: 0.8em;
    }

    /* Forms */
    #semester-info {
        padding: 15px;
    }

    #semester-info label {
        font-size: 0.85em;
    }

    #semester-info input {
        padding: 10px 12px;
        font-size: 0.9em;
    }

    #course-form {
        padding: 15px;
    }

    #course-form label {
        font-size: 0.85em;
    }

    #course-form input, #course-form select {
        padding: 10px 12px;
        font-size: 0.9em;
        margin-bottom: 12px;
    }

    /* Semester Detail */
    .semester-header {
        gap: 12px;
    }

    .semester-header h2 {
        font-size: 1.3em;
    }

    .sem-detail-stats {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .sem-stat-card {
        padding: 12px;
    }

    .sem-stat-card h4 {
        font-size: 0.7em;
    }

    .sem-stat-card p {
        font-size: 1.6em;
    }

    .courses-list {
        gap: 10px;
    }

    .semester-course-card {
        padding: 12px;
    }

    .course-card-title {
        font-size: 0.9em;
    }

    .course-card-grade {
        font-size: 0.75em;
        padding: 4px 10px;
    }

    .course-card-info {
        font-size: 0.8em;
        margin: 8px 0;
    }

    .add-course-section {
        padding: 15px;
    }

    .form-group-row input,
    .form-group-row select {
        padding: 10px 12px;
        font-size: 0.9em;
    }

    .course-type-btn {
        padding: 9px 12px;
        font-size: 0.85em;
    }

    .lab-fields input,
    .theory-fields input {
        padding: 10px 12px;
        font-size: 0.9em;
    }

    .btn-add-course {
        padding: 10px 16px;
        font-size: 0.9em;
    }

    .btn-delete-course {
        padding: 5px 10px;
        font-size: 0.8em;
    }

    /* Modal */
    .modal-content {
        padding: 24px 16px;
        border-radius: 16px;
    }

    .modal-course {
        padding: 12px;
    }

    #modal-sem-title {
        font-size: 1.2em;
    }

    .close-btn {
        right: 12px;
        top: 12px;
    }

    button {
        padding: 10px 16px;
        font-size: 0.9em;
    }
}

@media (max-width: 360px) {
    .container {
        padding: 12px 10px;
    }

    h1 {
        font-size: 1.2em;
        margin-bottom: 15px;
    }

    .semester-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        padding: 12px;
    }

    .stat-card p {
        font-size: 1.8em;
    }
}
/* ===== AUTH SECTION STYLES ===== */
.auth-section {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9998;
}

.auth-container {
    background: rgba(20, 30, 60, 0.9);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 16px;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.auth-container.hidden {
    display: none;
}

/* Google Sign In Button */
.btn-google-login {
    background: #ffffff;
    color: #3c4043;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-google-login:hover {
    background: #f8f9fa;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.btn-google-login svg {
    flex-shrink: 0;
}

/* User Info Display */
.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid rgba(100, 200, 255, 0.3);
    object-fit: cover;
}

.user-name {
    color: #ffffff;
    font-size: 0.9em;
    font-weight: 500;
    letter-spacing: 0.3px;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Logout Button */
.btn-logout {
    background: rgba(220, 53, 69, 0.1);
    color: #ff6b6b;
    border: 1px solid rgba(220, 53, 69, 0.2);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85em;
    font-weight: 500;
    transition: all 0.3s ease;
    letter-spacing: 0.3px;
}

.btn-logout:hover {
    background: rgba(220, 53, 69, 0.2);
    border-color: rgba(220, 53, 69, 0.4);
    color: #ffffff;
    transform: scale(1.05);
}

/* Sync Indicator (optional - for showing sync status) */
.sync-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4caf50;
    animation: pulse 2s infinite;
}

.sync-indicator.syncing {
    background: #ffb74d;
}

.sync-indicator.error {
    background: #ff6b6b;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .auth-section {
        top: 10px;
        right: 10px;
    }
    
    .auth-container {
        padding: 10px 15px;
    }
    
    .user-name {
        max-width: 100px;
        font-size: 0.85em;
    }
    
    .btn-google-login {
        font-size: 0.9em;
        padding: 9px 16px;
    }
    
    .btn-logout {
        font-size: 0.8em;
        padding: 7px 12px;
    }
}

@media (max-width: 480px) {
    .auth-section {
        position: relative;
        top: 0;
        right: 0;
        margin-bottom: 15px;
    }
    
    .user-info {
        gap: 8px;
    }
    
    .user-avatar {
        width: 32px;
        height: 32px;
    }
    
    .user-name {
        display: none; /* Hide name on very small screens */
    }
}