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

:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --reverse-color: #9333ea;
    --dark-bg: #1f2937;
    --dark-card: #374151;
    --dark-text: #f9fafb;
    --light-bg: #f8fafc;
    --light-card: #ffffff;
    --light-text: #1f2937;
    --border-color: #e5e7eb;
    --dark-border: #4b5563;
}

[data-theme="light"] {
    --bg-color: var(--light-bg);
    --card-color: var(--light-card);
    --text-color: var(--light-text);
    --border: var(--border-color);
}

[data-theme="dark"] {
    --bg-color: var(--dark-bg);
    --card-color: var(--dark-card);
    --text-color: var(--dark-text);
    --border: var(--dark-border);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    flex-grow: 1;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    opacity: 0.8;
    font-size: 1.1rem;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.top-right-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.language-switcher select {
    background: var(--card-color);
    border: 2px solid var(--border);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 25px;
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' 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 1rem center;
    background-size: 1em;
    padding-right: 2.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
}

.theme-toggle {
    background: var(--card-color);
    border: 2px solid var(--border);
    border-radius: 25px;
    padding: 8px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.theme-toggle:hover {
    border-color: var(--primary-color);
}

.country-info {
    background: var(--card-color);
    border: 2px solid var(--border);
    border-radius: 15px;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.control-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
}

.main-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.calculator-card {
    background: var(--card-color);
    border: 2px solid var(--border);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.input-group-wrapper {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.input-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.input-field {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 1.1rem;
    transition: all 0.3s ease;
    width: 100%;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.currency-select {
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    cursor: pointer;
}

.calc-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 20px 0;
}

.calc-btn {
    padding: 15px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.calc-btn.add-vat {
    background: var(--secondary-color);
    color: white;
}

.calc-btn.exclude-vat {
    background: var(--primary-color);
    color: white;
}

.calc-btn.reverse-vat {
    background: var(--reverse-color);
    color: white;
}

.calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.result {
    background: var(--bg-color);
    border: 2px solid var(--primary-color);
    border-radius: 15px;
    padding: 20px;
    margin-top: 20px;
    text-align: center;
}

.result-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.preset-amounts {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 8px 15px;
    background: var(--bg-color);
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.preset-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-card {
    background: var(--card-color);
    border: 2px solid var(--border);
    border-radius: 15px;
    padding: 20px;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.history-controls {
    display: flex;
    gap: 10px;
}

.history-btn {
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 5px 8px;
    cursor: pointer;
    font-size: 1.2rem;
}

#history {
    max-height: 385px; /* Approx height for 5 items */
    overflow-y: auto;
    padding-right: 5px; /* space for scrollbar */
}

.history-item {
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.history-item:hover {
    border-color: var(--primary-color);
}

.history-item-detail {
    font-size: 0.8rem;
    opacity: 0.7;
    display: flex;
    justify-content: space-between;
}

.clear-history-btn {
    width: 100%;
    padding: 10px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 10px;
}

.bulk-hint {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-bottom: 10px;
    text-align: left;
}

.bulk-textarea {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    font-family: monospace;
    resize: vertical;
}

.bulk-buttons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
    margin-top: 10px;
}

.bulk-results {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 15px;
}

.bulk-result-item {
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.detailed-breakdown {
    background: var(--bg-color);
    border-radius: 10px;
    padding: 15px;
    margin-top: 15px;
    border: 1px solid var(--border);
    text-align: left;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    font-size: 1rem;
    position: relative;
}

.detail-row:not(:last-child) {
    border-bottom: 1px solid var(--border);
}

.detail-label {
    color: var(--text-color);
    opacity: 0.8;
}

.detail-value {
    font-weight: 600;
    color: var(--text-color);
    margin-right: 30px; /* Space for copy button */
}

.detail-row.total {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
    padding-top: 12px;
}

.detail-row.total .detail-label,
.detail-row.total .detail-value {
    color: var(--primary-color);
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-color);
    opacity: 0.5;
    transition: all 0.2s ease;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
}

.copy-btn:hover {
    opacity: 1;
    color: var(--primary-color);
}

.copy-btn.copied {
    color: var(--secondary-color);
}

.export-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: center;
}

.export-btn {
    padding: 8px 12px;
    background: var(--warning-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--card-color);
    border-radius: 15px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    text-align: center;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    justify-content: center;
}

.modal-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

.modal-btn.primary {
    background: var(--primary-color);
    color: white;
}

.modal-btn.secondary {
    background: var(--border);
    color: var(--text-color);
}

.modal-btn.danger {
    background: var(--danger-color);
    color: white;
}

.keyboard-shortcuts {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 15px;
    text-align: center;
}

.footer {
    background: var(--card-color);
    border-top: 1px solid var(--border);
    padding: 20px;
    margin-top: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.footer a
{
    text-decoration: none;
    color: darkslategrey;
    font-weight: bold;
}

.footer a:hover
{
    color: orangered;
    font-weight: 800;
    font-size: large;
}

.footer-text {
    font-size: 0.9rem;
    opacity: 0.7;

}

@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .calc-buttons {
        grid-template-columns: 1fr;
    }
    
    .preset-amounts {
        justify-content: center;
    }
    
    .input-group-wrapper {
        grid-template-columns: 1fr;
    }

    .footer {
        flex-direction: column;
        text-align: center;
    }
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.vat-rate-selection {
    margin-bottom: 20px;
}

.vat-rate-selection label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.radio-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.radio-label {
    display: inline-block;
    padding: 8px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-color);
    position: relative;
    user-select: none;
}

.radio-label:hover {
    border-color: var(--primary-color);
}

.radio-input {
    display: none;
}

.radio-input:checked + .radio-label {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.custom-rate-input {
    width: 80px;
    padding: 8px 10px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.custom-rate-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}