:root {
    --bg-color: var(--tg-theme-bg-color, #ffffff);
    --text-color: var(--tg-theme-text-color, #000000);
    --hint-color: var(--tg-theme-hint-color, #999999);
    --btn-color: var(--tg-theme-button-color, #2481cc);
    --btn-text-color: var(--tg-theme-button-text-color, #ffffff);
    --card-bg: var(--tg-theme-secondary-bg-color, #f4f4f5);
}

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

.container { max-width: 100%; margin: 0 auto; }
.header h2 { margin-top: 0; font-size: 20px; text-align: center;}

.row { display: flex; gap: 10px; }
.input-group { flex: 1; margin-bottom: 12px; }

label {
    display: block; font-size: 13px; color: var(--hint-color); margin-bottom: 4px;
}

input, select {
    width: 100%; padding: 12px;
    border: 1px solid var(--hint-color); border-radius: 8px;
    background-color: var(--bg-color); color: var(--text-color);
    font-size: 16px; box-sizing: border-box; outline: none;
}
input:focus, select:focus { border-color: var(--btn-color); }

.results-card {
    background-color: var(--card-bg); border-radius: 12px;
    padding: 16px; margin-top: 16px;
}
.results-card h3 { margin-top: 0; font-size: 16px; margin-bottom: 12px; }

.result-row { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: 15px;}
.result-row.highlight {
    font-size: 18px; color: var(--btn-color); margin-top: 12px; padding-top: 12px;
    border-top: 1px solid var(--hint-color);
}

.error { color: #ff3b30; font-size: 14px; text-align: center; margin-bottom: 10px; }
.hidden { display: none; }

.btn-clear {
    width: 100%; padding: 14px; margin-top: 20px;
    background-color: transparent; color: #ff3b30;
    border: 1px solid #ff3b30; border-radius: 8px;
    font-size: 16px; font-weight: bold; cursor: pointer;
}