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

:root {
    /* Light Mode Colors */
    --primary-color: #F48807;
    --secondary-color: #FF6B35;
    --accent-color: #FFB347;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Light Mode Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #fef9f3;
    --bg-tertiary: #fff4e6;
    --bg-quaternary: #fef2e7;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-tertiary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #f0e6d2;
    --border-light: #faf5f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 var(--shadow-color);
    --shadow-md: 0 4px 6px -1px var(--shadow-color);
    --shadow-lg: 0 10px 15px -3px var(--shadow-color);
    --shadow-xl: 0 20px 25px -5px var(--shadow-color);
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Mode Colors */
.dark-mode {
    --bg-primary: #1f2937;
    --bg-secondary: #374151;
    --bg-tertiary: #4b5563;
    --bg-quaternary: #6b7280;
    --text-primary: #f9fafb;
    --text-secondary: #e5e7eb;
    --text-tertiary: #d1d5db;
    --text-light: #9ca3af;
    --border-color: #4b5563;
    --border-light: #374151;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-secondary);
    min-height: 100vh;
    transition: all var(--transition-normal);
}

.container {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: white;
    padding: 1.5rem 0;
    margin-top: 0rem;
    border-bottom: 4px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 40%, rgba(244, 136, 7, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 1;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.logo-container {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-normal);
}

.logo-container:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.university-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.header-text {
    text-align: left;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    
    background: linear-gradient(45deg, #ffffff, #ffffff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1) rotate(180deg);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* Main Content Layout */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 3rem;
    align-items: start;
}

/* Card Styles */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Calculator Section */
.calculator-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.card h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card h2 i {
    color: var(--primary-color);
    font-size: 1.3rem;
}

/* Form Styles */
.cgpa-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.course-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group small {
    color: var(--text-light);
    font-size: 0.85rem;
}

.form-group input,
.form-group select {
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(244, 136, 7, 0.1);
    transform: translateY(-1px);
}

.add-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    padding: 1.25rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-md);
    font-family: inherit;
}

.add-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, #e07706 0%, #e55a2b 100%);
}

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

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.clear-all-btn {
    background: var(--error-color);
    color: white;
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
}

.clear-all-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Courses List */
.courses-container {
    min-height: 120px;
}

.no-courses {
    text-align: center;
    color: var(--text-light);
    padding: 3rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 2px dashed var(--border-color);
}

.no-courses i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.no-courses p {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.course-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    margin-bottom: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.course-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
    background: var(--bg-quaternary);
}

.course-details {
    flex: 1;
}

.course-name {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.course-info {
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.course-info span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.grade-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.remove-btn {
    background: var(--error-color);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
}

.remove-btn:hover {
    background: #dc2626;
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Results Section */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-card {
    background: var(--bg-tertiary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    border: 2px solid var(--border-light);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.result-card:hover::before {
    transform: scaleX(1);
}

.result-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.result-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
}

.result-content h3 {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.result-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    display: block;
    line-height: 1;
}

.result-content small {
    color: var(--text-light);
    font-size: 0.8rem;
}

.cgpa-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
}

.cgpa-card .result-icon {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.cgpa-card h3,
.cgpa-card small {
    color: white;
    opacity: 0.95;
}

.cgpa-value {
    color: white;
    font-size: 2.5rem;
}

/* Progress Section */
.progress-section {
    background: var(--bg-tertiary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 2px solid var(--border-light);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.progress-bar {
    height: 16px;
    background: var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 0.75rem;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 8px;
    transition: width var(--transition-slow);
    width: 0%;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 500;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.grading-system h2,
.tips-section h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.grade-table-container {
    overflow-x: auto;
    margin-bottom: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.grade-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-primary);
}

.grade-table th,
.grade-table td {
    padding: 1rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.grade-table th {
    background: var(--bg-tertiary);
    font-weight: 700;
    color: var(--primary-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grade-table tr:hover {
    background: var(--bg-secondary);
}

.status-badge {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.excellent { background: #dcfce7; color: #166534; }
.status-badge.very-good { background: #dbeafe; color: #1e40af; }
.status-badge.good { background: #fef3c7; color: #92400e; }
.status-badge.average { background: #fed7aa; color: #9a3412; }
.status-badge.below-average { background: #fecaca; color: #991b1b; }
.status-badge.poor { background: #fee2e2; color: #991b1b; }
.status-badge.failing { background: #fecaca; color: #7f1d1d; }

.dark-mode .status-badge.excellent { background: #166534; color: #dcfce7; }
.dark-mode .status-badge.very-good { background: #1e40af; color: #dbeafe; }
.dark-mode .status-badge.good { background: #92400e; color: #fef3c7; }
.dark-mode .status-badge.average { background: #9a3412; color: #fed7aa; }
.dark-mode .status-badge.below-average { background: #991b1b; color: #fecaca; }
.dark-mode .status-badge.poor { background: #991b1b; color: #fee2e2; }
.dark-mode .status-badge.failing { background: #7f1d1d; color: #fecaca; }

/* Tips Section */
.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    transition: all var(--transition-normal);
}

.tip-item:hover {
    background: var(--bg-quaternary);
    transform: translateX(3px);
}

.tip-item i {
    color: var(--primary-color);
    width: 16px;
    font-size: 1rem;
    margin-top: 0.125rem;
}

.important-notice {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.1));
    border: 2px solid rgba(239, 68, 68, 0.2);
}

.important-notice i {
    color: var(--error-color);
}

kbd {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: white;
    padding: 1.5rem 0;
    margin-top: 4rem;
    border-top: 4px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 40%, rgba(244, 136, 7, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    transition: all var(--transition-normal);
    background: rgba(244, 136, 7, 0.2);
    border: 2px solid rgba(244, 136, 7, 0.3);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.social-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.social-icon:hover::before {
    opacity: 1;
}

.social-icon:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 8px 25px rgba(244, 136, 7, 0.4);
}

.social-icon i {
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

.copyright {
    text-align: center;
}

.copyright p {
    font-size: 0.9rem;
    opacity: 0.9;
    font-weight: 500;
    margin: 0;
}

/* Animations */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

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

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

.course-item {
    animation: slideIn 0.3s ease;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr 350px;
        gap: 2rem;
    }
}

@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 0 1rem;
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .logo-section {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-text {
        text-align: center;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 2rem 1rem;
    }
    
    .cgpa-input-grid,
    .form-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .course-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .course-info {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .social-links {
        gap: 0.8rem;
    }
    
    .social-icon {
        width: 35px;
        height: 35px;
    }
    
    .social-icon i {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .cgpa-value {
        font-size: 2rem;
    }
    
    .grade-table {
        font-size: 0.8rem;
    }
    
    .grade-table th,
    .grade-table td {
        padding: 0.75rem 0.5rem;
    }
    
    .card {
        padding: 1.25rem;
    }
    
    .main-content {
        padding: 1.5rem 1rem;
    }
}