/* Calculator Page Styles */
.calculator-page {
    min-height: 100vh;
    padding-top: 80px;
    background: var(--darker-bg);
}

.calculator-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.page-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* Split Layout - Left Input, Right Result */
.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Left Panel - Input Section */
.input-section {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    position: sticky;
    top: 100px;
}

.input-header {
    margin-bottom: var(--spacing-lg);
}

.input-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.input-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Course Entry Styles */
.semester-section {
    margin-bottom: var(--spacing-lg);
}

.semester-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.semester-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.add-semester-btn {
    background: transparent;
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
}

.add-semester-btn:hover {
    background: rgba(200, 255, 109, 0.1);
}

.course-entry {
    background: var(--dark-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.course-entry:hover {
    border-color: var(--accent-green);
}

.course-entry.highlighted {
    background: rgba(200, 255, 109, 0.05);
    border-color: var(--accent-green);
}

.course-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: var(--spacing-sm);
    align-items: center;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input,
.form-select {
    background: var(--darker-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px rgba(200, 255, 109, 0.1);
}

.form-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.remove-course-btn {
    background: transparent;
    border: none;
    color: #FF4444;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-size: 18px;
}

.remove-course-btn:hover {
    background: rgba(255, 68, 68, 0.1);
}

.add-course-btn {
    background: transparent;
    color: var(--accent-green);
    border: 1px dashed var(--border-color);
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

.add-course-btn:hover {
    border-color: var(--accent-green);
    background: rgba(200, 255, 109, 0.05);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.calculate-btn {
    flex: 1;
    background: var(--accent-green);
    color: var(--dark-bg);
    border: none;
    padding: 16px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow);
}

.calculate-btn:hover {
    background: #A0FF3D;
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(200, 255, 109, 0.5);
}

.clear-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.clear-btn:hover {
    background: var(--hover-bg);
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

/* Right Panel - Result Section */
.result-section {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    position: sticky;
    top: 100px;
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

.result-header {
    margin-bottom: var(--spacing-lg);
}

.result-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.result-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.result-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.result-empty {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
}

.result-empty-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

/* Main Result Display */
.main-result {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.result-value {
    font-size: 72px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-green), #A0FF3D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.result-unit {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

/* GPA Circle Display */
.gpa-display {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.gpa-circle {
    position: relative;
    width: 200px;
    height: 200px;
}

.circle-bg {
    fill: none;
    stroke: var(--dark-bg);
    stroke-width: 12;
}

.circle-progress {
    fill: none;
    stroke: url(#gradient);
    stroke-width: 12;
    stroke-linecap: round;
    transform: rotate(-90deg);
    transform-origin: center;
    transition: stroke-dashoffset 1s ease;
}

.gpa-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.gpa-value {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-green), #A0FF3D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.gpa-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 4px;
}

.gpa-scale {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* Performance Message */
.performance-message {
    background: rgba(200, 255, 109, 0.05);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(200, 255, 109, 0.2);
    margin-bottom: var(--spacing-lg);
}

.performance-message p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.performance-message strong {
    color: var(--accent-green);
}

/* Additional Details */
.result-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--dark-bg);
    border-radius: var(--radius-sm);
}

.detail-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.detail-value {
    font-weight: 600;
    color: var(--accent-green);
}

/* Conversion Mode Selection */
.mode-selection {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.mode-card {
    background: var(--dark-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-base);
    text-align: center;
}

.mode-card:hover {
    border-color: var(--accent-green);
    transform: translateY(-4px);
}

.mode-card.active {
    border-color: var(--accent-green);
    background: rgba(200, 255, 109, 0.05);
    box-shadow: var(--shadow-glow);
}

.mode-icon {
    font-size: 40px;
    margin-bottom: var(--spacing-sm);
}

.mode-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.mode-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Simple Input Form */
.simple-input {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.input-field {
    background: var(--darker-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 16px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    font-family: var(--font-family);
    transition: var(--transition-fast);
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(200, 255, 109, 0.1);
}

.input-helper {
    font-size: 12px;
    color: var(--text-secondary);
    font-style: italic;
}

/* Back Button */
.back-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-lg);
    transition: var(--transition-fast);
}

.back-button:hover {
    color: var(--accent-green);
    transform: translateX(-4px);
}

/* Responsive Calculator Layout */
@media (max-width: 1024px) {
    .calculator-layout {
        grid-template-columns: 1fr;
    }
    
    .input-section,
    .result-section {
        position: static;
    }
    
    .course-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .calculator-container {
        padding: var(--spacing-md);
    }
    
    .page-title {
        font-size: var(--font-size-xl);
    }
    
    .input-section,
    .result-section {
        padding: var(--spacing-md);
    }
    
    .result-value {
        font-size: 56px;
    }
    
    .gpa-circle {
        width: 160px;
        height: 160px;
    }
    
    .gpa-value {
        font-size: 36px;
    }
    
    .mode-selection {
        grid-template-columns: 1fr;
    }
}