/* =========================================
   GRADE CALCULATOR CSS
   ========================================= */

:root {
    --gc-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gc-bg-dark: #0f172a;
    --gc-bg-card: #1e293b;
    --gc-bg-input: #0f172a;
    --gc-border: #334155;
    --gc-border-light: #475569;
    --gc-white: #ffffff;
    --gc-gray: #cbd5e1;
    --gc-muted: #94a3b8;
    --gc-success: #22c55e;
    --gc-warning: #eab308;
    --gc-danger: #ef4444;
    --gc-purple: #a855f7;
}

.grade-calc-wrapper {
    background: linear-gradient(to bottom, var(--gc-bg-dark), var(--gc-bg-card));
    padding: 3rem 1.5rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--gc-white);
    line-height: 1.6;
    min-height: 100vh;
}

.grade-calc-wrapper * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.grade-calc-container {
    max-width: 1000px;
    margin: 0 auto;
}

/* Header */
.grade-calc-wrapper .calc-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.grade-calc-wrapper .calc-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gc-white);
    margin-bottom: 1rem;
}

.grade-calc-wrapper .calc-description {
    font-size: 1.1rem;
    color: var(--gc-gray);
    max-width: 700px;
    margin: 0 auto;
}

/* Card */
.grade-calc-wrapper .calc-card {
    background: var(--gc-bg-card);
    border: 1px solid var(--gc-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* Warning Box */
.grade-calc-wrapper .warning-box {
    display: none;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(234, 179, 8, 0.1);
    border: 1px solid rgba(234, 179, 8, 0.5);
    border-radius: 0.75rem;
    color: #fbbf24;
    margin-bottom: 1.5rem;
}

.grade-calc-wrapper .warning-box.show {
    display: flex;
}

/* Table */
.grade-calc-wrapper .table-wrapper {
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.grade-calc-wrapper .grade-table {
    width: 100%;
    border-collapse: collapse;
}

.grade-calc-wrapper .grade-table th {
    text-align: left;
    padding: 1rem;
    color: var(--gc-gray);
    font-weight: 600;
    font-size: 0.9rem;
    border-bottom: 2px solid var(--gc-border);
}

.grade-calc-wrapper .grade-table th:last-child {
    text-align: center;
}

.grade-calc-wrapper .grade-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--gc-border);
}

.grade-calc-wrapper .grade-table input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--gc-bg-input);
    border: 1px solid var(--gc-border-light);
    border-radius: 0.5rem;
    color: var(--gc-white);
    font-size: 0.95rem;
}

.grade-calc-wrapper .grade-table input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.grade-calc-wrapper .grade-table input::placeholder {
    color: var(--gc-muted);
}

/* Mobile Cards */
.grade-calc-wrapper .mobile-cards {
    display: none;
}

.grade-calc-wrapper .mobile-card {
    background: var(--gc-bg-input);
    border: 1px solid var(--gc-border);
    border-radius: 1rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.grade-calc-wrapper .mobile-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--gc-border);
}

.grade-calc-wrapper .mobile-card-title {
    font-weight: 600;
    color: var(--gc-white);
}

.grade-calc-wrapper .mobile-card-fields {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.grade-calc-wrapper .mobile-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.grade-calc-wrapper .mobile-field label {
    font-size: 0.8rem;
    color: var(--gc-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grade-calc-wrapper .mobile-field input {
    padding: 0.875rem 1rem;
    background: var(--gc-bg-card);
    border: 1px solid var(--gc-border-light);
    border-radius: 0.5rem;
    color: var(--gc-white);
    font-size: 1rem;
}

.grade-calc-wrapper .mobile-field input:focus {
    outline: none;
    border-color: #667eea;
}

/* Buttons */
.grade-calc-wrapper .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.grade-calc-wrapper .btn-primary {
    background: var(--gc-gradient);
    color: var(--gc-white);
}

.grade-calc-wrapper .btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.grade-calc-wrapper .btn-secondary {
    background: var(--gc-border);
    color: var(--gc-white);
}

.grade-calc-wrapper .btn-secondary:hover {
    background: var(--gc-border-light);
}

.grade-calc-wrapper .btn-danger {
    background: var(--gc-danger);
    color: var(--gc-white);
}

.grade-calc-wrapper .btn-danger:hover {
    background: #dc2626;
}

.grade-calc-wrapper .btn-remove {
    background: var(--gc-danger);
    color: var(--gc-white);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.grade-calc-wrapper .controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.grade-calc-wrapper .controls .btn {
    flex: 1;
    min-width: 150px;
}

/* Result Section */
.grade-calc-wrapper .result-section {
    display: none;
    background: var(--gc-gradient);
    border-radius: 1.5rem;
    padding: 2.5rem 2rem;
    text-align: center;
    margin-top: 2rem;
}

.grade-calc-wrapper .result-section.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

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

.grade-calc-wrapper .result-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gc-white);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.grade-calc-wrapper .grade-display {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.grade-calc-wrapper .grade-box {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: 1.5rem 2rem;
    min-width: 150px;
    flex: 1;
    max-width: 200px;
}

.grade-calc-wrapper .grade-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 0.5rem;
}

.grade-calc-wrapper .grade-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gc-white);
}

.grade-calc-wrapper .total-weight-info {
    color: rgba(255,255,255,0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* Info Cards */
.grade-calc-wrapper .info-card {
    background: var(--gc-bg-card);
    border: 1px solid var(--gc-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.grade-calc-wrapper .info-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gc-white);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.grade-calc-wrapper .info-title i {
    color: var(--gc-purple);
}

/* Steps */
.grade-calc-wrapper .steps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.grade-calc-wrapper .step-item {
    display: flex;
    gap: 1rem;
}

.grade-calc-wrapper .step-number {
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: var(--gc-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--gc-white);
}

.grade-calc-wrapper .step-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gc-white);
    margin-bottom: 0.25rem;
}

.grade-calc-wrapper .step-content p {
    font-size: 0.9rem;
    color: var(--gc-muted);
}

/* Scale Grid */
.grade-calc-wrapper .scale-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}

.grade-calc-wrapper .scale-item {
    border-radius: 0.75rem;
    padding: 1.25rem 1rem;
    text-align: center;
    border: 1px solid;
}

.grade-calc-wrapper .scale-a { background: rgba(34,197,94,0.1); border-color: rgba(34,197,94,0.5); }
.grade-calc-wrapper .scale-a .scale-letter { color: #22c55e; }

.grade-calc-wrapper .scale-b { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.5); }
.grade-calc-wrapper .scale-b .scale-letter { color: #3b82f6; }

.grade-calc-wrapper .scale-c { background: rgba(234,179,8,0.1); border-color: rgba(234,179,8,0.5); }
.grade-calc-wrapper .scale-c .scale-letter { color: #eab308; }

.grade-calc-wrapper .scale-d { background: rgba(249,115,22,0.1); border-color: rgba(249,115,22,0.5); }
.grade-calc-wrapper .scale-d .scale-letter { color: #f97316; }

.grade-calc-wrapper .scale-f { background: rgba(239,68,68,0.1); border-color: rgba(239,68,68,0.5); }
.grade-calc-wrapper .scale-f .scale-letter { color: #ef4444; }

.grade-calc-wrapper .scale-letter {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.grade-calc-wrapper .scale-range {
    font-size: 0.9rem;
    color: var(--gc-gray);
}

.grade-calc-wrapper .scale-gpa {
    font-size: 0.8rem;
    color: var(--gc-muted);
    margin-top: 0.25rem;
}

/* FAQ */
.grade-calc-wrapper .faq-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.grade-calc-wrapper .faq-item {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gc-border);
}

.grade-calc-wrapper .faq-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.grade-calc-wrapper .faq-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gc-white);
    margin-bottom: 0.5rem;
}

.grade-calc-wrapper .faq-item p {
    font-size: 0.95rem;
    color: var(--gc-muted);
    line-height: 1.7;
}

/* Responsive */
@media (max-width: 768px) {
    .grade-calc-wrapper {
        padding: 2rem 1rem;
    }
    
    .grade-calc-wrapper .calc-title {
        font-size: 2rem;
    }
    
    .grade-calc-wrapper .calc-card {
        padding: 1.5rem;
    }
    
    .grade-calc-wrapper .desktop-table {
        display: none;
    }
    
    .grade-calc-wrapper .mobile-cards {
        display: block;
    }
    
    .grade-calc-wrapper .controls {
        flex-direction: column;
    }
    
    .grade-calc-wrapper .controls .btn {
        width: 100%;
    }
    
    .grade-calc-wrapper .grade-display {
        flex-direction: column;
    }
    
    .grade-calc-wrapper .grade-box {
        max-width: 100%;
    }
    
    .grade-calc-wrapper .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .grade-calc-wrapper .scale-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grade-calc-wrapper .scale-item:last-child {
        grid-column: span 2;
    }
}

@media (max-width: 480px) {
    .grade-calc-wrapper .calc-title {
        font-size: 1.75rem;
    }
    
    .grade-calc-wrapper .grade-value {
        font-size: 2rem;
    }
    
    .grade-calc-wrapper .info-title {
        font-size: 1.25rem;
    }
}