/* =========================================
   GST CALCULATOR CSS
   ========================================= */

:root {
    --gst-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gst-gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gst-gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gst-gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --gst-gradient-5: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gst-bg-dark: #0f172a;
    --gst-bg-card: #1e293b;
    --gst-bg-input: #0f172a;
    --gst-border: #334155;
    --gst-border-light: #475569;
    --gst-white: #ffffff;
    --gst-gray: #cbd5e1;
    --gst-muted: #94a3b8;
    --gst-success: #22c55e;
    --gst-warning: #eab308;
    --gst-danger: #ef4444;
    --gst-purple: #a855f7;
    --gst-blue: #3b82f6;
    --gst-cyan: #06b6d4;
    --gst-orange: #f97316;
    --gst-pink: #ec4899;
}

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

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

.gst-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header */
.gst-wrapper .calc-header {
    text-align: center;
    margin-bottom: 2rem;
}

.gst-wrapper .header-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gst-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--gst-white);
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
}

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

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

/* Mode Selector */
.gst-wrapper .mode-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.gst-wrapper .mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--gst-bg-card);
    border: 2px solid var(--gst-border);
    border-radius: 1rem;
    color: var(--gst-gray);
    cursor: pointer;
    transition: all 0.3s ease;
}

.gst-wrapper .mode-btn:hover {
    border-color: var(--gst-purple);
    transform: translateY(-4px);
}

.gst-wrapper .mode-btn.active {
    background: var(--gst-gradient);
    border-color: transparent;
    color: var(--gst-white);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.gst-wrapper .mode-btn i {
    font-size: 2.5rem;
}

.gst-wrapper .mode-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.gst-wrapper .mode-desc {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* Main Calculator Card */
.gst-wrapper .main-calc-card {
    background: var(--gst-bg-card);
    border: 1px solid var(--gst-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.gst-wrapper .calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

/* Section Titles */
.gst-wrapper .section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gst-white);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.gst-wrapper .section-title i {
    color: var(--gst-purple);
}

/* Input Groups */
.gst-wrapper .input-group {
    margin-bottom: 1.75rem;
}

.gst-wrapper .input-group.inline {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0;
}

.gst-wrapper .input-group.inline label {
    margin-bottom: 0;
    white-space: nowrap;
}

.gst-wrapper .input-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gst-gray);
    margin-bottom: 0.75rem;
}

.gst-wrapper .input-label i {
    color: var(--gst-purple);
}

.gst-wrapper .input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
}

.gst-wrapper .input-wrapper.large {
    margin-bottom: 0;
}

.gst-wrapper .input-prefix,
.gst-wrapper .input-suffix {
    position: absolute;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gst-muted);
}

.gst-wrapper .input-prefix {
    left: 1.25rem;
}

.gst-wrapper .input-suffix {
    right: 1.25rem;
}

.gst-wrapper .calc-input {
    width: 100%;
    padding: 1rem 3rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border-light);
    border-radius: 0.75rem;
    color: var(--gst-white);
    font-size: 1.25rem;
    font-weight: 700;
    transition: all 0.3s ease;
}

.gst-wrapper .calc-input.small {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.gst-wrapper .calc-input:focus {
    outline: none;
    border-color: var(--gst-purple);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.15);
}

/* Rate Buttons */
.gst-wrapper .rate-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.gst-wrapper .rate-btn {
    padding: 0.75rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 0.5rem;
    color: var(--gst-gray);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gst-wrapper .rate-btn:hover {
    border-color: var(--gst-purple);
    transform: translateY(-2px);
}

.gst-wrapper .rate-btn.active {
    background: var(--gst-gradient);
    border-color: transparent;
    color: var(--gst-white);
}

/* Slider */
.gst-wrapper .slider {
    width: 100%;
    height: 6px;
    background: var(--gst-bg-input);
    border-radius: 3px;
    outline: none;
    margin-bottom: 0.5rem;
    -webkit-appearance: none;
}

.gst-wrapper .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--gst-gradient);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.gst-wrapper .slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--gst-gradient);
    cursor: pointer;
    border-radius: 50%;
    border: none;
}

.gst-wrapper .slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--gst-muted);
}

/* Country Select */
.gst-wrapper .country-rates {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gst-border);
}

.gst-wrapper .country-select {
    width: 100%;
    padding: 1rem 1.25rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border-light);
    border-radius: 0.75rem;
    color: var(--gst-white);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gst-wrapper .country-select:focus {
    outline: none;
    border-color: var(--gst-purple);
}

/* Formula Card */
.gst-wrapper .formula-card {
    padding: 1.5rem;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 0.75rem;
    margin-top: 1.5rem;
}

.gst-wrapper .formula-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gst-purple);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.gst-wrapper .formula-display {
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    color: var(--gst-cyan);
    line-height: 1.8;
}

/* Results Section */
.gst-wrapper .result-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--gst-gradient);
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.gst-wrapper .result-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--gst-white);
    flex-shrink: 0;
}

.gst-wrapper .result-content {
    flex: 1;
}

.gst-wrapper .result-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.gst-wrapper .result-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gst-white);
}

/* Breakdown Grid */
.gst-wrapper .breakdown-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.gst-wrapper .breakdown-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 0.75rem;
}

.gst-wrapper .breakdown-card.highlight {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--gst-success);
}

.gst-wrapper .breakdown-icon {
    width: 40px;
    height: 40px;
    background: var(--gst-gradient);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--gst-white);
    flex-shrink: 0;
}

.gst-wrapper .breakdown-label {
    font-size: 0.75rem;
    color: var(--gst-muted);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.gst-wrapper .breakdown-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gst-white);
}

/* Visual Breakdown */
.gst-wrapper .visual-breakdown {
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
}

.gst-wrapper .visual-breakdown h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gst-gray);
    margin-bottom: 1rem;
}

.gst-wrapper .breakdown-bar {
    display: flex;
    height: 60px;
    border-radius: 0.5rem;
    overflow: hidden;
    margin-bottom: 1rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.gst-wrapper .bar-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.5s ease;
}

.gst-wrapper .bar-segment.base {
    background: var(--gst-gradient-3);
}

.gst-wrapper .bar-segment.gst {
    background: var(--gst-gradient-4);
}

.gst-wrapper .segment-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gst-white);
}

.gst-wrapper .breakdown-percentages {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.gst-wrapper .percentage-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--gst-bg-card);
    border-radius: 0.5rem;
}

.gst-wrapper .percentage-label {
    font-size: 0.85rem;
    color: var(--gst-muted);
}

.gst-wrapper .percentage-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gst-cyan);
}

/* Action Buttons */
.gst-wrapper .action-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.gst-wrapper .btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 0.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.gst-wrapper .btn-primary {
    background: var(--gst-gradient);
    color: var(--gst-white);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.gst-wrapper .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.gst-wrapper .btn-secondary {
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    color: var(--gst-gray);
}

.gst-wrapper .btn-secondary:hover {
    border-color: var(--gst-purple);
    color: var(--gst-white);
}

.gst-wrapper .btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

/* Reference Section */
.gst-wrapper .reference-section {
    background: var(--gst-bg-card);
    border: 1px solid var(--gst-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
}

.gst-wrapper .reference-controls {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.gst-wrapper .table-wrapper {
    overflow-x: auto;
    max-height: 500px;
    overflow-y: auto;
}

.gst-wrapper .reference-table {
    width: 100%;
    border-collapse: collapse;
}

.gst-wrapper .reference-table thead {
    position: sticky;
    top: 0;
    background: var(--gst-bg-input);
    z-index: 10;
}

.gst-wrapper .reference-table th,
.gst-wrapper .reference-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gst-border);
}

.gst-wrapper .reference-table th {
    color: var(--gst-gray);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
}

.gst-wrapper .reference-table td {
    color: var(--gst-white);
    font-family: 'Courier New', monospace;
}

.gst-wrapper .reference-table tbody tr:hover {
    background: rgba(102, 126, 234, 0.05);
}

.gst-wrapper .copy-icon {
    cursor: pointer;
    color: var(--gst-purple);
    transition: all 0.3s ease;
}

.gst-wrapper .copy-icon:hover {
    color: var(--gst-cyan);
    transform: scale(1.2);
}

/* Bulk Section */
.gst-wrapper .bulk-section {
    background: var(--gst-bg-card);
    border: 1px solid var(--gst-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
}

.gst-wrapper .bulk-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.gst-wrapper .bulk-textarea {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border-light);
    border-radius: 0.75rem;
    color: var(--gst-white);
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
}

.gst-wrapper .bulk-textarea:focus {
    outline: none;
    border-color: var(--gst-purple);
}

.gst-wrapper .bulk-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.gst-wrapper .checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gst-gray);
    cursor: pointer;
}

.gst-wrapper .checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.gst-wrapper .bulk-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.gst-wrapper .bulk-results-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gst-gray);
}

.gst-wrapper .bulk-results-content {
    min-height: 300px;
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 0.75rem;
}

.gst-wrapper .bulk-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--gst-muted);
    text-align: center;
}

.gst-wrapper .bulk-empty i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.gst-wrapper .bulk-result-item {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--gst-bg-card);
    border-radius: 0.5rem;
    font-size: 0.9rem;
}

.gst-wrapper .bulk-result-item .label {
    color: var(--gst-muted);
    font-size: 0.75rem;
}

.gst-wrapper .bulk-result-item .value {
    color: var(--gst-white);
    font-weight: 600;
}

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

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

.gst-wrapper .info-title i {
    color: var(--gst-purple);
}

/* Countries Grid */
.gst-wrapper .countries-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.gst-wrapper .country-card {
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 1rem;
    text-align: center;
    transition: all 0.3s ease;
}

.gst-wrapper .country-card:hover {
    border-color: var(--gst-purple);
    transform: translateY(-4px);
}

.gst-wrapper .country-flag {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.gst-wrapper .country-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gst-white);
    margin-bottom: 0.5rem;
}

.gst-wrapper .country-rate {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gst-cyan);
    margin-bottom: 0.5rem;
}

.gst-wrapper .country-detail {
    font-size: 0.8rem;
    color: var(--gst-muted);
}

/* Slabs Grid */
.gst-wrapper .slabs-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}

.gst-wrapper .slab-card {
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 1rem;
}

.gst-wrapper .slab-rate {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 50%;
    color: var(--gst-white);
}

.gst-wrapper .slab-rate.zero { background: var(--gst-success); }
.gst-wrapper .slab-rate.low { background: var(--gst-gradient-4); }
.gst-wrapper .slab-rate.medium { background: var(--gst-gradient-3); }
.gst-wrapper .slab-rate.high { background: var(--gst-gradient); }
.gst-wrapper .slab-rate.luxury { background: var(--gst-gradient-2); }

.gst-wrapper .slab-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gst-white);
    text-align: center;
    margin-bottom: 1rem;
}

.gst-wrapper .slab-card ul {
    list-style: none;
}

.gst-wrapper .slab-card li {
    padding: 0.4rem 0;
    font-size: 0.8rem;
    color: var(--gst-muted);
    border-bottom: 1px solid var(--gst-border);
}

.gst-wrapper .slab-card li:last-child {
    border-bottom: none;
}

/* How To Grid */
.gst-wrapper .how-to-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.gst-wrapper .how-to-card {
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 1rem;
}

.gst-wrapper .how-to-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    border-radius: 1rem;
    color: var(--gst-white);
}

.gst-wrapper .how-to-icon.add { background: var(--gst-gradient-4); }
.gst-wrapper .how-to-icon.remove { background: var(--gst-gradient-2); }
.gst-wrapper .how-to-icon.find { background: var(--gst-gradient-3); }

.gst-wrapper .how-to-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gst-white);
    text-align: center;
    margin-bottom: 1rem;
}

.gst-wrapper .formula-box,
.gst-wrapper .example-box {
    padding: 1rem;
    background: var(--gst-bg-card);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
}

.gst-wrapper .formula-box strong,
.gst-wrapper .example-box strong {
    color: var(--gst-cyan);
}

.gst-wrapper .formula-box {
    font-family: 'Courier New', monospace;
    color: var(--gst-gray);
}

.gst-wrapper .example-box {
    color: var(--gst-muted);
}

/* Tips Grid */
.gst-wrapper .tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.gst-wrapper .tip-box {
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.gst-wrapper .tip-box:hover {
    border-color: var(--gst-purple);
    transform: translateY(-4px);
}

.gst-wrapper .tip-icon {
    width: 48px;
    height: 48px;
    background: var(--gst-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--gst-white);
    margin-bottom: 1rem;
}

.gst-wrapper .tip-box h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gst-white);
    margin-bottom: 0.5rem;
}

.gst-wrapper .tip-box p {
    font-size: 0.85rem;
    color: var(--gst-muted);
    line-height: 1.6;
}

/* FAQ */
.gst-wrapper .faq-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.gst-wrapper .faq-item {
    padding: 1.5rem;
    background: var(--gst-bg-input);
    border: 1px solid var(--gst-border);
    border-radius: 0.75rem;
}

.gst-wrapper .faq-item h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gst-white);
    margin-bottom: 0.75rem;
}

.gst-wrapper .faq-item p {
    font-size: 0.9rem;
    color: var(--gst-muted);
    line-height: 1.7;
}

/* Responsive */
@media (max-width: 1200px) {
    .gst-wrapper .countries-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .gst-wrapper .slabs-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1024px) {
    .gst-wrapper .calc-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .bulk-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .how-to-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .gst-wrapper {
        padding: 2rem 1rem;
    }
    
    .gst-wrapper .calc-title {
        font-size: 2rem;
    }
    
    .gst-wrapper .mode-selector {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .breakdown-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .countries-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .gst-wrapper .slabs-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .faq-list {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .rate-buttons {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .gst-wrapper .calc-title {
        font-size: 1.75rem;
    }
    
    .gst-wrapper .header-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .gst-wrapper .result-value {
        font-size: 2rem;
    }
    
    .gst-wrapper .countries-grid {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .action-buttons {
        grid-template-columns: 1fr;
    }
    
    .gst-wrapper .reference-controls {
        flex-direction: column;
    }
}