:root {
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #212529;
    --accent-color: #007bff;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
    --key-bg: #f1f3f5;
    --key-text: #495057;
    --key-active: #e9ecef;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --card-bg: #1e1e1e;
        --text-color: #e0e0e0;
        --accent-color: #378afe;
        --border-color: #333333;
        --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        --key-bg: #2d2d2d;
        --key-text: #e0e0e0;
        --key-active: #404040;
    }
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

header {
    padding: 16px;
    text-align: center;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.icon-button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    font-size: 1.2rem;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
}

.icon-button:hover {
    background: var(--key-active);
}

.currency-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    list-style: none;
}

.currency-row {
    position: relative;
    background: var(--card-bg);
    margin-bottom: 12px;
    padding: 16px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid transparent;
    overflow: hidden;
}

.currency-row.active {
    border-color: var(--accent-color);
}

.drag-handle {
    cursor: grab;
    padding: 8px;
    color: #888;
    margin-right: 8px;
    display: flex;
    align-items: center;
    font-size: 1.2rem;
}

.currency-info {
    display: flex;
    align-items: center;
    flex: 1;
}

.flag {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    margin-right: 12px;
    object-fit: cover;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.currency-code {
    font-weight: 600;
    font-size: 1.1rem;
    margin-right: 4px;
}

.currency-symbol {
    color: #888;
    font-size: 0.9rem;
}

.amount-container {
    text-align: right;
    transition: transform 0.2s;
}

.amount {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 2px;
}

.rate-info {
    font-size: 0.75rem;
    color: #888;
}

.delete-action {
    position: absolute;
    right: -80px;
    top: 0;
    bottom: 0;
    width: 80px;
    background: #ff4d4d;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    transition: right 0.2s;
    cursor: pointer;
}

.currency-row.swiped .delete-action {
    right: 0;
}

.currency-row.swiped .amount-container {
    transform: translateX(-80px);
}

.add-button-row {
    display: flex;
    justify-content: center;
    padding: 12px;
}

.add-btn {
    background: var(--key-bg);
    border: none;
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.keypad {
    background: var(--card-bg);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 8px;
    padding: 12px;
    border-top: 1px solid var(--border-color);
}

.key {
    background: var(--key-bg);
    border: none;
    padding: 14px 0;
    border-radius: 8px;
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--key-text);
    cursor: pointer;
    transition: background 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.key:active {
    background: var(--key-active);
}

.key.action-clear {
    color: #ff4d4d;
}

.key.action-back {
    color: var(--accent-color);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: flex-end;
}

.modal-content {
    background: var(--card-bg);
    width: 100%;
    max-height: 80%;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    overflow-y: auto;
    padding: 24px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.currency-select-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.select-row {
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: background 0.2s;
}

.select-row:hover {
    background: var(--key-bg);
}

footer {
    padding: 8px;
    text-align: center;
    font-size: 0.7rem;
    color: #888;
}

#installButton {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    cursor: pointer;
}