:root {
    --bg: #f7f7f7;
    --bg-card: #ffffff;
    --text-main: #222222;
    --text-muted: #555555;
    --border: #dddddd;
    --accent: #0077ff;
    --accent-soft: rgba(0, 119, 255, 0.1);
    --error-bg: #ffe6e6;
    --error-text: #a00000;
    --warning-text: #b36b00;
}

body.dark {
    --bg: #121212;
    --bg-card: #1f1f1f;
    --text-main: #f5f5f5;
    --text-muted: #a0a0a0;
    --border: #333333;
    --accent: #4da3ff;
    --accent-soft: rgba(77, 163, 255, 0.15);
    --error-bg: #3b1010;
    --error-text: #ff8a8a;
    --warning-text: #ffb84d;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    background: var(--bg);
    color: var(--text-main);
    padding: 16px;
    margin: 0;
}

/* Top bar */

.top-bar {
    max-width: 760px;
    margin: 0 auto 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-text {
    font-weight: 600;
    font-size: 16px;
}

/* Container */

.container {
    max-width: 760px;
    margin: auto;
}

h1 {
    text-align: left;
    margin: 0 0 4px;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* Cards */

.card {
    background: var(--bg-card);
    padding: 18px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border: 1px solid var(--border);
    margin-bottom: 16px;
}

.card-title {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 18px;
}

/* Inputs */

label {
    display: block;
    margin: 10px 0 4px;
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 9px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    background: transparent;
    color: var(--text-main);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-soft);
}

/* Buttons */

button {
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

button[type="button"]:not(.secondary-btn) {
    width: 100%;
    background: var(--accent);
    color: #ffffff;
    padding: 11px;
    margin-top: 16px;
}

button[type="button"]:not(.secondary-btn):hover {
    opacity: 0.95;
}

.secondary-btn {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 8px 10px;
    border-radius: 999px;
    font-size: 13px;
}

.secondary-btn.full-width {
    width: 100%;
    margin-top: 10px;
}

/* Presets */

.preset-group {
    margin-bottom: 12px;
}

.preset-label {
    margin: 0 0 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.chip-btn {
    border-radius: 999px;
    padding: 6px 10px;
    background: var(--accent-soft);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 13px;
}

.chip-btn:hover {
    opacity: 0.95;
}

/* Rounding slider */

.rounding-row {
    margin-top: 14px;
}

.rounding-row label {
    margin-bottom: 6px;
}

.rounding-row input[type="range"] {
    width: 100%;
}

.rounding-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Error / warning */

.error {
    background: var(--error-bg);
    color: var(--error-text);
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 13px;
    margin-bottom: 10px;
}

.warning {
    font-size: 13px;
    color: var(--warning-text);
    margin-top: 6px;
}

.hidden {
    display: none;
}

/* Results */

.results p {
    margin: 4px 0;
}

.share-status {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Footer */

.footer {
    margin-top: 20px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

.disclaimer {
    margin-top: 0;
    margin-bottom: 6px;
}

.footer-links {
    display: flex;
    gap: 6px;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 11px;
}

.footer-links a[aria-disabled="true"] {
    opacity: 0.7;
    pointer-events: none;
}

/* Small screens */

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .top-bar {
        padding: 0 4px;
    }
}
/* Tooltip */
.tooltip {
    display: inline-block;
    margin-left: 6px;
    font-weight: 700;
    color: var(--accent);
    cursor: pointer;
    position: relative;
    user-select: none;
}

.tooltiptext {
    visibility: hidden;
    opacity: 0;
    width: 220px;
    background: var(--bg-card);
    color: var(--text-main);
    text-align: left;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px;
    position: absolute;
    z-index: 10;
    top: 22px;
    left: 0;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    transition: opacity 0.15s ease;
    font-weight: 400;
    font-size: 12px;
}

/* Show tooltip on hover (desktop) and focus (mobile tap + keyboard) */
.tooltip:hover .tooltiptext,
.tooltip:focus .tooltiptext,
.tooltip:focus-within .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* Ad slots */
.ad-slot {
    width: 100%;
    min-height: 90px;   /* prevents layout jump later */
    margin: 20px 0;
    text-align: center;
}

.ad-results {
    margin-top: 10px;
}

.ad-footer {
    margin-top: 25px;
}