/**
 * Worldwide GPA Calculator Styles - SEO Optimized
 */

.gpa-calculator {
    --gpc-primary: #7c3aed;
    --gpc-primary-dark: #6d28d9;
    --gpc-primary-light: #ede9fe;
    --gpc-success: #10b981;
    --gpc-danger: #ef4444;
    --gpc-warning: #f59e0b;
    --gpc-gray-50: #f9fafb;
    --gpc-gray-100: #f3f4f6;
    --gpc-gray-200: #e5e7eb;
    --gpc-gray-300: #d1d5db;
    --gpc-gray-400: #9ca3af;
    --gpc-gray-500: #6b7280;
    --gpc-gray-600: #4b5563;
    --gpc-gray-700: #374151;
    --gpc-gray-800: #1f2937;
    --gpc-gray-900: #111827;
    --gpc-white: #ffffff;
    --gpc-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --gpc-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --gpc-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --gpc-radius: 12px;
    --gpc-radius-sm: 8px;
    --gpc-transition: all 0.3s ease;

    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--gpc-gray-800);
    max-width: 900px;
    margin: 0 auto;
}

.gpa-calculator * {
    box-sizing: border-box;
}

/* Header */
.gpc-header {
    text-align: center;
    padding: 32px 24px;
    background: linear-gradient(135deg, var(--gpc-primary) 0%, var(--gpc-primary-dark) 100%);
    border-radius: var(--gpc-radius);
    margin-bottom: 24px;
}

.gpc-h1 {
    font-size: 32px;
    font-weight: 800;
    color: var(--gpc-white);
    margin: 0 0 16px 0;
    line-height: 1.3;
}

.gpc-intro {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.95);
    margin: 0;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Navigation */
.gpc-nav {
    background: var(--gpc-gray-50);
    border-radius: var(--gpc-radius-sm);
    padding: 16px 20px;
    margin-bottom: 32px;
    border: 1px solid var(--gpc-gray-200);
}

.gpc-nav-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 24px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.gpc-nav-link {
    color: var(--gpc-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    padding: 8px 4px;
    border-bottom: 2px solid transparent;
    transition: var(--gpc-transition);
}

.gpc-nav-link:hover,
.gpc-nav-link:focus {
    color: var(--gpc-primary-dark);
    border-bottom-color: var(--gpc-primary);
}

/* Sections */
.gpc-section {
    margin-bottom: 48px;
    padding: 0 8px;
}

.gpc-h2 {
    font-size: 26px;
    font-weight: 700;
    color: var(--gpc-gray-900);
    margin: 0 0 20px 0;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--gpc-primary-light);
}

.gpc-h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gpc-gray-800);
    margin: 24px 0 12px 0;
}

.gpc-h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--gpc-gray-700);
    margin: 20px 0 10px 0;
}

.gpc-content p {
    margin: 0 0 16px 0;
    color: var(--gpc-gray-700);
}

/* Calculator Section */
.gpc-calculator-section {
    background: var(--gpc-white);
    border-radius: var(--gpc-radius);
    padding: 32px;
    box-shadow: var(--gpc-shadow);
    border: 1px solid var(--gpc-gray-200);
}

.gpc-container {
    max-width: 100%;
}

/* Country Selector */
.gpc-country-selector {
    margin-bottom: 24px;
}

.gpc-select-country {
    font-size: 16px;
    font-weight: 500;
}

/* Scale Info */
.gpc-scale-info {
    background: var(--gpc-gray-50);
    border-radius: var(--gpc-radius-sm);
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--gpc-gray-200);
}

.gpc-scale-info .gpc-h4 {
    margin-top: 0;
    color: var(--gpc-primary-dark);
}

.gpc-scale-table {
    overflow-x: auto;
}

.gpc-scale-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.gpc-scale-table th,
.gpc-scale-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--gpc-gray-200);
}

.gpc-scale-table th {
    background: var(--gpc-primary-light);
    color: var(--gpc-primary-dark);
    font-weight: 600;
}

.gpc-scale-table tr:hover {
    background: var(--gpc-gray-50);
}

/* Form */
.gpc-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.gpc-courses-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.gpc-course-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 40px;
    gap: 12px;
    align-items: end;
    padding: 16px;
    background: var(--gpc-gray-50);
    border-radius: var(--gpc-radius-sm);
    border: 1px solid var(--gpc-gray-200);
}

.gpc-course-row:hover {
    border-color: var(--gpc-primary-light);
}

.gpc-form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.gpc-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--gpc-gray-600);
}

.gpc-input,
.gpc-select {
    width: 100%;
    padding: 10px 12px;
    font-size: 15px;
    color: var(--gpc-gray-800);
    background: var(--gpc-white);
    border: 2px solid var(--gpc-gray-200);
    border-radius: var(--gpc-radius-sm);
    transition: var(--gpc-transition);
    outline: none;
}

.gpc-input::placeholder {
    color: var(--gpc-gray-400);
}

.gpc-input:focus,
.gpc-select:focus {
    border-color: var(--gpc-primary);
    box-shadow: 0 0 0 3px var(--gpc-primary-light);
}

.gpc-input.gpc-input-error {
    border-color: var(--gpc-danger);
    background: #fef2f2;
}

.gpc-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 36px;
}

/* Remove Button */
.gpc-btn-remove {
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--gpc-danger);
    color: var(--gpc-white);
    border: none;
    border-radius: var(--gpc-radius-sm);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    transition: var(--gpc-transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.gpc-btn-remove:hover,
.gpc-btn-remove:focus {
    background: #dc2626;
    transform: scale(1.05);
}

/* Buttons */
.gpc-button-group {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.gpc-button-group-add {
    justify-content: flex-start;
}

.gpc-btn {
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--gpc-radius-sm);
    cursor: pointer;
    transition: var(--gpc-transition);
    outline: none;
}

.gpc-btn-primary {
    flex: 1;
    background: var(--gpc-primary);
    color: var(--gpc-white);
}

.gpc-btn-primary:hover,
.gpc-btn-primary:focus {
    background: var(--gpc-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--gpc-shadow);
}

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

.gpc-btn-secondary {
    flex: 1;
    background: var(--gpc-gray-100);
    color: var(--gpc-gray-700);
    border: 2px solid var(--gpc-gray-200);
}

.gpc-btn-secondary:hover,
.gpc-btn-secondary:focus {
    background: var(--gpc-gray-200);
    border-color: var(--gpc-gray-300);
}

.gpc-btn-add {
    background: var(--gpc-success);
    color: var(--gpc-white);
    padding: 10px 20px;
}

.gpc-btn-add:hover,
.gpc-btn-add:focus {
    background: #059669;
    transform: translateY(-1px);
}

/* Error Messages */
.gpc-error {
    font-size: 12px;
    color: var(--gpc-danger);
    min-height: 16px;
    display: block;
    margin-top: 4px;
}

/* Results Section */
.gpc-results {
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--gpc-gray-200);
    animation: gpc-fadeIn 0.4s ease;
}

@keyframes gpc-fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gpc-results-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gpc-gray-800);
    text-align: center;
    margin: 0 0 20px 0;
}

.gpc-result-display {
    background: var(--gpc-primary-light);
    border-radius: var(--gpc-radius);
    padding: 24px;
    text-align: center;
}

.gpc-result-main {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid rgba(124, 58, 237, 0.2);
}

.gpc-result-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gpc-primary-dark);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.gpc-result-value {
    display: inline-block;
    font-size: 48px;
    font-weight: 800;
    color: var(--gpc-primary);
    line-height: 1;
}

.gpc-result-scale {
    font-size: 24px;
    font-weight: 600;
    color: var(--gpc-primary-dark);
}

.gpc-result-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 16px;
}

.gpc-result-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.gpc-result-item-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--gpc-gray-600);
    text-transform: uppercase;
}

.gpc-result-item-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--gpc-gray-800);
}

/* Example Table */
.gpc-example-box {
    background: var(--gpc-gray-50);
    border: 1px solid var(--gpc-gray-200);
    border-radius: var(--gpc-radius);
    padding: 24px;
    margin-top: 20px;
    overflow-x: auto;
}

.gpc-example-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    margin-bottom: 20px;
}

.gpc-example-table th,
.gpc-example-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--gpc-gray-200);
}

.gpc-example-table th {
    background: var(--gpc-primary-light);
    color: var(--gpc-primary-dark);
    font-weight: 600;
}

.gpc-example-table tfoot td {
    background: var(--gpc-gray-100);
    font-weight: 600;
}

/* Formula Box */
.gpc-formula-box {
    background: var(--gpc-gray-900);
    border-radius: var(--gpc-radius-sm);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.gpc-formula {
    font-family: 'Courier New', monospace;
    font-size: 16px;
    color: var(--gpc-white);
    text-align: center;
}

/* Lists */
.gpc-list {
    margin: 0 0 20px 0;
    padding-left: 24px;
}

.gpc-list li {
    margin-bottom: 8px;
    color: var(--gpc-gray-700);
}

/* Tips Grid */
.gpc-tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.gpc-tip-card {
    background: var(--gpc-white);
    border: 1px solid var(--gpc-gray-200);
    border-radius: var(--gpc-radius-sm);
    padding: 20px;
    transition: var(--gpc-transition);
    border-left: 4px solid var(--gpc-primary);
}

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

.gpc-tip-card p {
    margin: 0;
    font-size: 15px;
}

/* FAQ Section */
.gpc-faq-item {
    background: var(--gpc-white);
    border: 1px solid var(--gpc-gray-200);
    border-radius: var(--gpc-radius-sm);
    padding: 24px;
    margin-bottom: 16px;
    transition: var(--gpc-transition);
}

.gpc-faq-item:hover {
    border-color: var(--gpc-primary-light);
    box-shadow: var(--gpc-shadow-sm);
}

.gpc-faq-question {
    font-size: 18px;
    font-weight: 600;
    color: var(--gpc-primary-dark);
    margin: 0 0 12px 0;
    line-height: 1.4;
}

.gpc-faq-answer p {
    margin: 0;
    color: var(--gpc-gray-700);
}

/* Footer & Disclaimer */
.gpc-footer {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 2px solid var(--gpc-gray-200);
}

.gpc-disclaimer {
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: var(--gpc-radius-sm);
    padding: 24px;
}

.gpc-disclaimer .gpc-h3 {
    color: #92400e;
    margin-top: 0;
}

.gpc-disclaimer p {
    color: #78350f;
    margin: 0;
    font-size: 14px;
    line-height: 1.7;
}

/* AdSense Friendly Spacing */
.gpc-adsense-slot {
    margin: 32px 0;
    text-align: center;
    min-height: 90px;
}

/* Responsive */
@media (max-width: 768px) {
    .gpc-header {
        padding: 24px 20px;
    }

    .gpc-h1 {
        font-size: 24px;
    }

    .gpc-intro {
        font-size: 15px;
    }

    .gpc-nav-list {
        gap: 4px 16px;
    }

    .gpc-nav-link {
        font-size: 13px;
        padding: 6px 4px;
    }

    .gpc-section {
        margin-bottom: 36px;
        padding: 0;
    }

    .gpc-h2 {
        font-size: 22px;
    }

    .gpc-calculator-section {
        padding: 24px 20px;
    }

    .gpc-course-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .gpc-btn-remove {
        width: 100%;
        height: 40px;
    }

    .gpc-button-group {
        flex-direction: column;
    }

    .gpc-btn {
        width: 100%;
    }

    .gpc-result-value {
        font-size: 36px;
    }

    .gpc-result-scale {
        font-size: 20px;
    }

    .gpc-result-details {
        grid-template-columns: 1fr 1fr;
    }

    .gpc-scale-table {
        font-size: 13px;
    }

    .gpc-example-table {
        font-size: 13px;
    }

    .gpc-example-table th,
    .gpc-example-table td {
        padding: 8px 10px;
    }

    .gpc-tips-grid {
        grid-template-columns: 1fr;
    }

    .gpc-faq-item {
        padding: 20px;
    }

    .gpc-faq-question {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .gpa-calculator {
        font-size: 15px;
    }

    .gpc-h1 {
        font-size: 22px;
    }

    .gpc-h2 {
        font-size: 20px;
    }

    .gpc-h3 {
        font-size: 18px;
    }

    .gpc-input,
    .gpc-select {
        padding: 10px 12px;
        font-size: 16px;
    }

    .gpc-result-value {
        font-size: 32px;
    }

    .gpc-result-details {
        grid-template-columns: 1fr;
    }

    .gpc-example-box,
    .gpc-tip-card,
    .gpc-faq-item {
        padding: 16px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .gpc-input,
    .gpc-select {
        border-width: 3px;
    }

    .gpc-btn-primary {
        border: 2px solid var(--gpc-gray-900);
    }

    .gpc-nav-link {
        text-decoration: underline;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .gpa-calculator * {
        animation: none !important;
        transition: none !important;
    }
}

/* Print styles */
@media print {
    .gpc-nav,
    .gpc-btn,
    .gpc-btn-remove {
        display: none !important;
    }

    .gpc-section {
        page-break-inside: avoid;
    }
}

/* Focus visible for accessibility */
.gpc-btn:focus-visible,
.gpc-input:focus-visible,
.gpc-select:focus-visible,
.gpc-nav-link:focus-visible,
.gpc-btn-remove:focus-visible {
    outline: 3px solid var(--gpc-primary);
    outline-offset: 2px;
}

/* Skip link for accessibility */
.gpc-skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--gpc-primary);
    color: var(--gpc-white);
    padding: 8px 16px;
    text-decoration: none;
    z-index: 100;
}

.gpc-skip-link:focus {
    top: 0;
}