html {
    color-scheme: light;
}

html[data-theme="dark"] {
    color-scheme: dark;
}

:root,
html[data-theme="light"] {
    --bg: #f4f5f7;
    --fg: #1a1a1a;
    --muted: #5c6370;
    --card: #ffffff;
    --border: #c5cad3;
    --link: #1a5fb4;
    --header-bg: #ffffff;
    --button-bg: #e8eaef;
    --button-fg: #1a1a1a;
    --change-sat: 62%;
    --change-light: 86%;
    --up: #c01c28;
    --down: #26a269;
}

html[data-theme="dark"] {
    --bg: #1b1d21;
    --fg: #e8eaed;
    --muted: #9aa0a6;
    --card: #2a2d33;
    --border: #4a4f58;
    --link: #8ab4f8;
    --header-bg: #24262b;
    --button-bg: #3a3e46;
    --button-fg: #e8eaed;
    --change-sat: 42%;
    --change-light: 26%;
    --up: #ff7b72;
    --down: #7ee787;
}

html, body {
    background: var(--bg);
    color: var(--fg);
}

body {
    margin: 0;
    font-family: Segoe UI, system-ui, sans-serif;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 20;
}

.top-bar a {
    color: var(--link);
}

.top-bar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.page-content {
    padding: 16px;
}

.theme-toggle,
.chart-download,
.chart-reset-zoom {
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--button-bg);
    color: var(--button-fg);
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 14px;
}

.chart-reset-zoom:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

a {
    color: var(--link);
}

.rates-table,
.benchmark-table {
    background: var(--card);
    color: var(--fg);
    border-color: var(--border);
}

.rates-table th,
.benchmark-table th {
    background: var(--header-bg);
}

.rates-table,
.benchmark-table {
    border-collapse: collapse;
    border: 1px solid var(--border);
}

.rates-table th,
.rates-table td,
.benchmark-table th,
.benchmark-table td {
    border: 1px solid var(--border);
}

.rates-table a {
    color: inherit;
    text-decoration: none;
}

.rates-table a:hover {
    text-decoration: underline;
}

.rate-cell,
.benchmark-row {
    background-color: hsl(var(--change-hue), var(--change-sat), var(--change-light));
}

.tippy-box[data-theme~='light'] {
    background: #333;
    color: #fff;
}

.tippy-box[data-theme~='dark'] {
    background: #e8eaed;
    color: #1a1a1a;
}

.change-up {
    color: var(--up);
}

.change-down {
    color: var(--down);
}

.chart-wrap {
    position: relative;
    height: min(70vh, 640px);
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    cursor: crosshair;
}

.chart-empty {
    padding: 24px;
}

.chart-spread-note {
    color: var(--muted);
    margin-top: 12px;
}