:root {
    --primary: #f8f8f8;
    --accent: #FFCC00;        /* Yellow from American traditional palette */
    --accent-dark: #E6B800;   /* Darker yellow for hover states */
    --background: #121212;
    --card-bg: #1E1E1E;
    --border: #333333;
    --text-muted: #AAAAAA;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
    background-color: var(--background);
    color: var(--primary);
    line-height: 1.5;
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 500px;
    margin: 0 auto;
    padding: 0 1rem;
    position: relative;
}

select {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--primary);
    font-size: 1.1rem;
    padding: 0.875rem 1rem;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
}

select option {
    background: var(--card-bg);
    color: var(--primary);
}

.exchange-rate::after {
    content: "▼";
    position: absolute;
    right: 1rem;
    pointer-events: none;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.app-header {
    padding: 1.5rem 0;
    margin-bottom: 1rem;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    width: 100%;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.5px;
}

.calculator {
    margin-bottom: 2rem;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.input-group {
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(255, 204, 0, 0.2);
}

.currency, .percentage {
    font-weight: 600;
    color: var(--accent);
    padding: 0 1rem;
    font-size: 1.1rem;
}

input[type="number"] {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--primary);
    font-size: 1.25rem;
    padding: 0.875rem 0;
    outline: none;
    -moz-appearance: textfield;
    width: 100%;
}

/* Specific style for premium input */
#premium {
    padding-left: 1rem;
}

/* Remove left padding from USD input */
#usd-amount {
    padding-left: 0;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 1.5rem 0;
}

.result {
    text-align: center;
    margin: 1.5rem 0;
}

.result-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.unit {
    font-size: 2rem;
    color: var(--text-muted);
}

.rate-info {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 2rem;
}

.rate {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.rate:last-child {
    margin-bottom: 0;
}

.rate .label {
    color: var(--text-muted);
    margin: 0;
}

.rate .value {
    color: var(--primary);
    font-weight: 500;
}

.accent {
    color: var(--accent) !important;
    font-weight: 600 !important;
}

.app-footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: auto;
}

.app-footer a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}

.app-footer a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.usa-icon {
    display: inline-block;
    vertical-align: middle;
    margin: 0 2px 0 1px;
    position: relative;
    top: -1px;
    width: 24px;
    height: 13px;
    border-radius: 1px;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.1);
    overflow: hidden;
    flex-shrink: 0;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .app {
        padding: 0 1rem;
    }

    .card {
        padding: 1.25rem;
    }

    .result-value {
        font-size: 2.25rem;
    }
}

/* PWA specific styles */
@media (display-mode: standalone) {
    .app {
        padding: 0 1rem env(safe-area-inset-bottom);
    }
}