/* CSS 樣式區塊：定義所有顏色和佈局 */
:root {
    --bg: #f7f8fb;
    --card: #ffffff;
    --accent: #0f62fe;
    --muted: #666;
    --danger: #e84d4d; /* 錯誤紅色 */
}

html, body {
    height: 100%;
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, 'Noto Sans TC', "Microsoft JhengHei", Arial;
}

body {
    background: linear-gradient(180deg, #f2f6ff 0%, var(--bg) 100%);
    padding: 24px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.card {
    background: var(--card);
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(16,24,40,0.06);
    padding: 20px;
}

header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

h1 {
    font-size: 20px;
    margin: 0;
}

p.lead {
    margin: 6px 0 0;
    color: var(--muted);
}

.pager {
    display: flex;
    gap: 8px;
    align-items: center;
    margin: 12px 0;
}

.btn {
    background: var(--accent);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
}

.btn.secondary {
    background: #e6eefc;
    color: var(--accent);
}

.questions {
    margin-top: 12px;
}

/* 問題容器樣式 */
.q {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #eef3ff;
    margin-bottom: 10px;
    transition: border-color 0.2s;
}

.q h3 {
    font-size: 20px;
    margin: 0 0 8px;
}

.options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.opt {
    flex: 1 1 48%;
    min-width: 200px;
}

label.optButton {
    display: block;
    background: #fbfdff;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #e8eefc;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

label.optButton input {
    margin-right: 8px;
}

/* 選中時按鈕變色 */
label.optButton input:checked + span {
    color: var(--accent);
    font-weight: 600;
}

label.optButton input:checked {
    accent-color: var(--accent);
}

label.optButton input:checked:not(.skip) ~ * {
    background-color: #e6eefc;
    border-color: var(--accent);
}

/* 未作答題標示 */
.q.unanswered {
    border: 2px solid var(--danger);
    background-color: #fff8f8;
}

.q.unanswered h3 {
    color: var(--danger);
}

.progressBar {
    height: 10px;
    background: #eef3ff;
    border-radius: 999px;
    overflow: hidden;
}

.progressBar > i {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #66a3ff);
    width: 0%;
    transition: width 0.3s ease;
}

/* summary 區塊，診斷報告與雷達圖左右平均分配 */
.summary {
    margin-top: 16px;
    display: grid;
    grid-template-columns: 1fr 1fr; /* 左右各 50% */
    gap: 16px;
}

.chartCard {
    padding: 12px;
    height: 420px;
}

#radarChart {
    width: 100% !important;
    height: 100% !important;
}

/* 報告區文字自動換行、與雷達圖等高 */
.report {
    white-space: pre-wrap;
    font-family: Inter, 'Noto Sans TC', monospace;
    max-height: 420px;
    overflow-y: auto;
}

footer {
    margin-top: 16px;
    color: var(--muted);
    font-size: 13px;
}

.small {
    font-size: 13px;
    color: var(--muted);
}

/* 響應式：手機版單欄 */
@media(max-width:960px) {
    .summary {
        grid-template-columns: 1fr;
    }
    .opt {
        flex: 1 1 100%;
    }
}