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

:root {
    --bg-main: #1a1a1a;
    --bg-card: #242424;
    --bg-card-hover: #2a2a2a;
    --text-main: #F9F9F9;
    --text-secondary: #B0B0B0;
    --text-muted: #777777;
    --accent: #4CA58C;
    --border: #3a3a3a;
    --input-bg: #1f1f1f;
    --input-border: #3a3a3a;
    --swap-btn-bg: #2a2a2a;
    --swap-btn-hover: #333333;
    --key-op-bg: #D68D41;
    --positive-color: #42B883;
    --negative-color: #E74C3C;
}

[data-theme="light"] {
    --bg-main: #FFFFFF;
    --bg-card: #F8F9FA;
    --bg-card-hover: #E9ECEF;
    --text-main: #050505;
    --text-secondary: #3E4042;
    --text-muted: #65676B;
    --accent: #4CA58C;
    --border: #CED4DA;
    --input-bg: #FFFFFF;
    --input-border: #BCC0C4;
    --swap-btn-bg: #E4E6EB;
    --swap-btn-hover: #D1D5DB;
    --key-op-bg: #D68D41;
    --positive-color: #28A745;
    --negative-color: #DC3545;
}

body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

* {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    padding: 0;
    margin: 0;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding-top: 8px;
}

.app-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-main);
}

.header-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-tap-highlight-color: transparent;
    color: var(--text-main);
    text-decoration: none;
}

.header-btn:hover {
    background-color: var(--bg-card-hover);
    transform: scale(1.05);
}

.header-btn:active {
    transform: scale(0.95);
}

/* Touch-friendly improvements for mobile */
@media (hover: none) and (pointer: coarse) {
    .header-btn {
        min-width: 44px;
        min-height: 44px;
    }

    .currency-selector {
        min-height: 44px;
    }

    .swap-btn {
        min-width: 48px;
        min-height: 48px;
    }

    .period-btn {
        min-height: 40px;
    }

    .currency-item {
        min-height: 60px;
    }

    .settings-item {
        min-height: 48px;
    }
}

.header-btn svg {
    width: 24px;
    height: 24px;
}

.theme-toggle-btn {
    /* Same styles as header-btn, no additional changes needed */
}

.theme-icon {
    transition: opacity 0.3s ease;
}

/* Converter Container */
.converter-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;
}

/* Currency Card */
.currency-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(0);
}

.currency-card:hover {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--bg-card-hover) 0%, var(--bg-card) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .currency-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.currency-card-header {
    margin-bottom: 12px;
}

.currency-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.currency-card-body {
    display: flex;
    align-items: center;
    gap: 16px;
}

.currency-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent;
    min-width: 120px;
}

.currency-selector:hover {
    background-color: var(--input-bg);
}

.flag-container {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #555;
    flex-shrink: 0;
}

.flag {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    border-radius: 50%;
}

.currency-code {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-main);
    flex: 1;
}

.dropdown-arrow {
    flex-shrink: 0;
    opacity: 0.6;
}

.currency-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 36px;
    font-weight: 500;
    font-family: inherit;
    text-align: right;
    outline: none;
    min-width: 0;
    -webkit-appearance: none;
    -moz-appearance: textfield;
    transition: color 0.3s ease;
}

.currency-input.animating {
    animation: numberPulse 0.3s ease;
}

@keyframes numberPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.currency-input::-webkit-outer-spin-button,
.currency-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.currency-input::placeholder {
    color: var(--text-muted);
}

/* Swap Button */
.swap-container {
    display: flex;
    justify-content: center;
    margin: -8px 0;
    position: relative;
    z-index: 1;
}

.swap-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--swap-btn-bg) 0%, var(--swap-btn-hover) 100%);
    border: 2px solid var(--bg-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-tap-highlight-color: transparent;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.swap-btn:hover {
    background: linear-gradient(135deg, var(--swap-btn-hover) 0%, var(--swap-btn-bg) 100%);
    transform: scale(1.1) rotate(180deg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.swap-btn:active {
    transform: scale(0.95) rotate(180deg);
}

/* Rate Info */
.rate-info {
    text-align: center;
    padding: 16px 0;
    margin-top: 8px;
}

.rate-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.rate-date {
    font-size: 14px;
    color: var(--text-muted);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s;
}

[data-theme="light"] .modal {
    background-color: rgba(0, 0, 0, 0.4);
}

.modal.show {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background-color: var(--bg-card);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    border-radius: 20px;
    padding: 0;
    animation: modalFadeIn 0.3s ease-out;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] .modal-content {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@media (max-width: 480px) {
    .modal-content {
        width: 95%;
        max-width: 95%;
        max-height: 85vh;
        margin: 10px;
        border-radius: 16px;
    }

    .modal-header {
        padding: 16px 20px;
    }

    .modal-header h2 {
        font-size: 18px;
    }

    .close-btn {
        width: 36px;
        height: 36px;
        font-size: 28px;
    }

    .search-container {
        padding: 12px 16px;
    }

    .search-input {
        font-size: 16px;
        padding: 12px 16px;
    }

    .currency-list {
        padding: 0 8px 12px;
    }

    .currency-item {
        padding: 14px;
        margin-bottom: 8px;
    }

    .currency-item-flag {
        width: 36px;
        height: 36px;
        margin-right: 10px;
    }

    .currency-item-code {
        font-size: 16px;
    }

    .currency-item-name {
        font-size: 13px;
    }

    .settings-item {
        padding: 16px 20px;
    }

    .settings-item span {
        font-size: 15px;
    }

    .about-content,
    .privacy-content {
        padding: 20px 16px;
        font-size: 14px;
    }
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 32px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    line-height: 1;
    border-radius: 8px;
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.close-btn:hover {
    background-color: var(--input-bg);
}

.close-btn:active {
    opacity: 0.7;
}

.search-container {
    padding: 18px 11px 12px;
}

.search-input {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 16px;
    font-family: inherit;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    background-color: var(--bg-card);
}

.currency-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 11px 16px;
    /* Custom scrollbar styles */
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) transparent;
}

.currency-list::-webkit-scrollbar {
    width: 8px;
}

.currency-list::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 4px;
}

.currency-list::-webkit-scrollbar-thumb {
    background-color: var(--text-muted);
    border-radius: 4px;
    opacity: 0.5;
}

.currency-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
    opacity: 0.8;
}

[data-theme="light"] .currency-list {
    scrollbar-color: var(--border) transparent;
}

[data-theme="light"] .currency-list::-webkit-scrollbar-thumb {
    background-color: var(--border);
}

[data-theme="light"] .currency-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 24px 20px 16px;
    margin-top: 32px;
    background-color: transparent;
}

.app-footer p {
    font-size: 12px;
    color: var(--text-muted);
    opacity: 0.5;
    margin: 0;
    font-weight: 400;
}

.currency-item {
    display: flex;
    align-items: center;
    padding: 16px;
    background-color: var(--input-bg);
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.currency-item:hover {
    background-color: var(--bg-card-hover);
}

.currency-item:active {
    background-color: var(--border);
}

.currency-item-flag {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 12px;
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
}

.currency-item-info {
    flex: 1;
}

.currency-item-code {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 4px;
}

.currency-item-name {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Favorite button removed */

.settings-modal {
    max-height: 60vh;
}

.settings-list {
    padding: 0;
}

.settings-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.2s;
}

.settings-item:hover {
    background-color: var(--input-bg);
}

.settings-item:active {
    background-color: var(--bg-card-hover);
}

.settings-item span {
    font-size: 16px;
    color: var(--text-main);
}

.settings-value {
    color: var(--text-secondary) !important;
}

.language-list {
    padding: 0;
}

.language-item {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.language-item:hover {
    background-color: var(--input-bg);
}

.language-item:active {
    background-color: var(--bg-card-hover);
}

.language-item.selected {
    background-color: var(--input-bg);
}

.language-item span {
    font-size: 16px;
    color: var(--text-main);
}

.about-content,
.privacy-content {
    padding: 24px;
    color: var(--text-main);
    line-height: 1.6;
}

.about-content p {
    margin-bottom: 12px;
}

.privacy-content p {
    margin-bottom: 16px;
}

.privacy-modal {
    max-height: 80vh;
}

.privacy-content {
    overflow-y: auto;
}

/* Favorites header removed */

/* Responsive adjustments */
@media (max-width: 768px) {
    .app-container {
        padding: 16px;
        max-width: 100%;
    }

    .header {
        margin-bottom: 24px;
        padding-top: 4px;
    }

    .app-title {
        font-size: 22px;
    }

    .header-btn {
        width: 40px;
        height: 40px;
    }

    .header-btn svg {
        width: 20px;
        height: 20px;
    }

    .currency-input {
        font-size: 28px;
    }

    .currency-card {
        padding: 16px;
    }

    .currency-card-header {
        margin-bottom: 10px;
    }

    .currency-label {
        font-size: 13px;
    }

    .currency-selector {
        min-width: 100px;
        padding: 6px 10px;
    }

    .flag-container {
        width: 36px;
        height: 36px;
    }

    .currency-code {
        font-size: 16px;
    }

    .rate-info {
        padding: 12px 0;
        margin-top: 4px;
    }

    .rate-text {
        font-size: 14px;
    }

    .rate-date {
        font-size: 12px;
    }

    .chart-section {
        margin-top: 24px;
        padding: 16px;
    }

    .chart-title {
        font-size: 18px;
    }

    .chart-container {
        height: 280px;
        padding: 12px;
    }

    .chart-periods {
        gap: 6px;
        margin-bottom: 16px;
    }

    .period-btn {
        padding: 8px 6px;
        font-size: 12px;
    }

    .app-footer {
        padding: 20px 16px 12px;
        margin-top: 24px;
    }

    .app-footer p {
        font-size: 11px;
    }

    .chart-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        padding: 8px;
        margin-top: 12px;
    }

    .stat-item {
        padding: 10px 8px;
    }

    .stat-value {
        font-size: 16px;
    }

    .stat-label {
        font-size: 11px;
    }

    .chart-change-indicator {
        padding: 10px 12px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .change-hint {
        display: none;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 12px;
    }

    .header {
        margin-bottom: 20px;
    }

    .app-title {
        font-size: 20px;
    }

    .header-buttons {
        gap: 6px;
    }

    .header-btn {
        width: 36px;
        height: 36px;
    }

    .header-btn svg {
        width: 18px;
        height: 18px;
    }

    .currency-input {
        font-size: 24px;
    }

    .currency-card {
        padding: 14px;
    }

    .currency-selector {
        min-width: 90px;
        padding: 5px 8px;
        gap: 8px;
    }

    .flag-container {
        width: 32px;
        height: 32px;
    }

    .currency-code {
        font-size: 15px;
    }

    .swap-btn {
        width: 40px;
        height: 40px;
    }

    .rate-info {
        padding: 10px 0;
    }

    .rate-text {
        font-size: 13px;
    }

    .rate-date {
        font-size: 11px;
    }

    .chart-section {
        margin-top: 20px;
        padding: 12px;
    }

    .chart-title {
        font-size: 16px;
        margin-bottom: 12px;
    }

    .chart-container {
        height: 240px;
        padding: 10px;
    }

    .chart-periods {
        gap: 4px;
        margin-bottom: 12px;
    }

    .period-btn {
        padding: 8px 4px;
        font-size: 11px;
        border-radius: 10px;
    }

    .app-footer {
        padding: 16px 12px 10px;
        margin-top: 20px;
    }

    .app-footer p {
        font-size: 10px;
    }
}

@media (orientation: portrait) and (max-width: 768px) {
    .converter-container {
        gap: 12px;
    }

    .currency-card {
        padding: 14px;
    }

    .swap-container {
        margin: -4px 0;
    }

    .swap-btn {
        width: 44px;
        height: 44px;
    }

    .chart-section {
        margin-top: 20px;
        padding: 16px;
    }

    .chart-container {
        height: 250px;
    }
}

/* Chart Section */
.chart-section {
    margin-top: 32px;
    padding: 24px;
    background-color: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
}

.chart-header {
    margin-bottom: 16px;
}

.chart-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
}

.chart-periods {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.period-btn {
    flex: 1;
    padding: 10px;
    background: linear-gradient(135deg, #3E3E3E 0%, #4a4a4a 100%);
    border: none;
    border-radius: 12px;
    color: var(--text-main);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

.period-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.period-btn:hover::before {
    width: 200px;
    height: 200px;
}

.period-btn:hover {
    background: linear-gradient(135deg, #4a4a4a 0%, #3E3E3E 100%);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.period-btn.active {
    background: linear-gradient(135deg, var(--key-op-bg) 0%, #E8A055 100%);
    box-shadow: 0 2px 8px rgba(214, 141, 65, 0.4);
}

.period-btn:active {
    transform: scale(0.95);
}

/* Light theme styles for period buttons */
[data-theme="light"] .period-btn {
    background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
    color: var(--text-main);
    border: 1px solid var(--border);
}

[data-theme="light"] .period-btn:hover {
    background: linear-gradient(135deg, #F8F9FA 0%, #FFFFFF 100%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .period-btn.active {
    background: linear-gradient(135deg, var(--key-op-bg) 0%, #E8A055 100%);
    color: #FFFFFF;
    border: 1px solid var(--key-op-bg);
    box-shadow: 0 2px 8px rgba(214, 141, 65, 0.3);
}

[data-theme="light"] .period-btn::before {
    background: rgba(0, 0, 0, 0.05);
}

.chart-container {
    position: relative;
    width: 100%;
    height: 320px;
    background-color: var(--input-bg);
    border-radius: 16px;
    padding: 16px;
    cursor: crosshair;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

@media (max-width: 768px) {
    .chart-container {
        height: 280px;
        padding: 12px;
    }
    
    .chart-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }
    
    .stat-item {
        padding: 10px;
    }
    
    .stat-value {
        font-size: 16px;
    }
}

.chart-container canvas {
    max-height: 100%;
    position: relative;
    z-index: 1;
}

.chart-selection-overlay {
    position: absolute;
    top: 16px;
    left: 16px;
    right: 16px;
    bottom: 16px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(214, 141, 65, 0.15) 0%, 
        rgba(214, 141, 65, 0.15) 100%, 
        transparent 100%);
    border-left: 2px solid var(--key-op-bg);
    border-right: 2px solid var(--key-op-bg);
    pointer-events: none;
    z-index: 2;
    transition: opacity 0.2s ease;
}

.selection-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--key-op-bg);
    cursor: ew-resize;
    pointer-events: all;
    z-index: 3;
    transition: width 0.2s ease, background-color 0.2s ease;
}

.selection-handle:hover {
    width: 6px;
    background-color: #E8A055;
}

.selection-handle-left {
    left: 0;
}

.selection-handle-right {
    right: 0;
}

.chart-loading,
.chart-error {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-main);
}

.chart-loading {
    font-size: 16px;
    font-weight: 500;
}

.chart-error p {
    margin: 0;
}

.chart-error p:first-child {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.chart-error p:last-child {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.chart-change-indicator {
    margin-top: 16px;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--input-bg) 0%, var(--bg-card) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid var(--border);
    animation: slideDown 0.3s ease-out;
}

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

.change-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.change-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
}

.change-value.positive {
    color: #4CA58C;
}

.change-value.negative {
    color: #E74C3C;
}

.change-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: auto;
    font-style: italic;
}

.clear-selection-btn {
    margin-left: auto;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--border);
    border: none;
    color: var(--text-main);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, transform 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.clear-selection-btn:hover {
    background-color: var(--text-muted);
    transform: scale(1.1);
}

.clear-selection-btn:active {
    transform: scale(0.95);
}

.chart-stats {
    margin-top: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    animation: slideDown 0.3s ease-out 0.1s both;
}

.stat-item {
    padding: 12px;
    background: linear-gradient(135deg, var(--input-bg) 0%, var(--bg-card) 100%);
    border-radius: 12px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-item:hover {
    transform: translateY(-2px);
    border-color: var(--key-op-bg);
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
}

/* Focus styles for accessibility */
.currency-input:focus {
    color: var(--text-main);
}

.currency-selector:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.swap-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.period-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    /* Ensure minimum touch target size (44x44px recommended by Apple/Google) */
    .header-btn {
        min-width: 44px;
        min-height: 44px;
    }

    .currency-selector {
        min-height: 44px;
    }

    .swap-btn {
        min-width: 48px;
        min-height: 48px;
    }

    .period-btn {
        min-height: 44px;
    }

    .currency-item {
        min-height: 60px;
    }

    .settings-item {
        min-height: 48px;
    }

    .close-btn {
        min-width: 44px;
        min-height: 44px;
    }

    /* Remove hover effects on touch devices */
    .currency-card:hover {
        transform: translateY(0);
        box-shadow: none;
    }

    .header-btn:hover {
        transform: scale(1);
    }
}

/* Landscape orientation on mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .chart-container {
        height: 200px;
    }

    .app-footer {
        padding: 12px 16px 8px;
        margin-top: 16px;
    }
}