:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --primary: #2f6fed;
  --primary-d: #1f54c4;
  --text: #1f2533;
  --muted: #6b7280;
  --line: #e3e8f0;
  --ok: #1aa179;
  --warn: #e0892b;
  --danger: #d9534f;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(31, 37, 51, 0.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 18px 80px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 22px 26px;
  margin-bottom: 18px;
}
h1 { font-size: 24px; margin: 0 0 6px; }
h2 { font-size: 19px; margin: 0 0 12px; }
h3 { font-size: 16px; margin: 18px 0 8px; }
p { margin: 8px 0; }
.muted { color: var(--muted); font-size: 14px; }
.center { text-align: center; }

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 11px 22px;
  font-size: 16px;
  cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: var(--primary-d); }
.btn:disabled { background: #aab4c8; cursor: not-allowed; }
.btn.secondary { background: #eef2fb; color: var(--primary-d); }
.btn.ghost { background: transparent; color: var(--primary); border: 1px solid var(--line); }
.btn.danger { background: #e23b3b; }
.btn.danger:hover { background: #c22f2f; }

/* 进度条 */
.progress { height: 8px; background: var(--line); border-radius: 6px; overflow: hidden; margin: 6px 0 4px; }
.progress > i { display: block; height: 100%; background: var(--primary); width: 0; transition: width .25s; }
.progress-label { font-size: 13px; color: var(--muted); }

/* 三进度条：方式对比 / 业态对比·mode1 / 业态对比·mode2，每次只显示一段 */
.prog-wrap { margin: 12px 0 8px; }
.progress-block { margin: 10px 0; }
.prog-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 3px; }
.prog-title { font-size: 14px; font-weight: 700; color: var(--text); white-space: nowrap; }
.prog-title::before { content: ""; display: inline-block; width: 9px; height: 9px; border-radius: 2px; background: var(--primary); margin-right: 7px; vertical-align: 0; }
.progress-block:nth-child(2) .prog-title::before { background: var(--ok); }
.progress-block:nth-child(3) .prog-title::before { background: var(--ok); }

/* 段落提示：每段首题顶部说明本部分在比较什么 */
.seg-banner { margin: 14px 0 16px; padding: 12px 14px; border: 1px solid #d6e4ff; border-left: 4px solid var(--primary); border-radius: 8px; background: #f5f9ff; }
.seg-banner .seg-title { font-size: 15px; font-weight: 700; color: var(--primary); margin-bottom: 4px; }
.seg-banner .seg-desc { font-size: 13.5px; line-height: 1.65; color: #40566e; }

/* 基础信息 / 筛查 选项 */
.field { margin: 14px 0; }
.field > label.q { font-weight: 600; display: block; margin-bottom: 8px; }
.opt-row { display: flex; flex-wrap: wrap; gap: 10px; }
.opt {
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 9px 14px;
  cursor: pointer;
  user-select: none;
  transition: all .12s;
  background: #fff;
}
.opt:hover { border-color: var(--primary); }
.opt.sel { border-color: var(--primary); background: #eef3ff; color: var(--primary-d); font-weight: 600; }
.opt.disabled { opacity: .45; cursor: not-allowed; }
.hint { font-size: 13px; color: var(--warn); min-height: 18px; }

/* 题目 */
.task { padding: 14px 0; border-top: 1px dashed var(--line); }
.task:first-of-type { border-top: none; }
.scene-desc {
  background: #f0f3fa;
  border-left: 3px solid var(--primary);
  border-radius: 8px;
  padding: 11px 14px;
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}
.scene-desc .tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border-radius: 4px;
  padding: 1px 7px;
  margin-right: 8px;
  vertical-align: 1px;
}

/* 时间组成说明表 */
.time-comp { width: 100%; border-collapse: collapse; font-size: 14px; margin: 8px 0 12px; }
.time-comp th, .time-comp td { border: 1px solid var(--line); padding: 9px 10px; text-align: left; }
.time-comp th { background: #f0f3fa; font-weight: 600; }
.time-comp td:first-child { white-space: nowrap; }
.stem { font-weight: 600; margin-bottom: 10px; }
.stem .note { font-weight: 400; color: var(--warn); font-size: 13.5px; }
.choice {
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  margin: 8px 0;
  cursor: pointer;
  transition: all .12s;
}
.choice:hover { border-color: var(--primary); }
.choice.sel { border-color: var(--primary); background: #eef3ff; }
/* 选项间不同的部分：加粗 + 琥珀高亮底块，作为一眼可见的提醒 */
.choice .diff {
  font-weight: 700;
  color: #a85b00;
  background: #fff3d6;
  border: 1px solid rgba(224, 137, 43, 0.35);
  border-radius: 5px;
  padding: 1px 6px;
  margin: 0 1px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.choice.sel .diff { background: #ffe7a8; }
.choice .ltr { font-weight: 800; margin-right: 8px; }
.answered-dot { color: var(--ok); font-size: 13px; margin-left: 8px; }
.task.missing .choice { border-color: var(--danger); }
.task.missing .stem::before {
  content: "⚠ 此题未作答 · "; color: var(--danger); font-weight: 700; font-size: 13.5px;
}

/* 分页导航 */
.nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.nav-row > .btn { min-width: 110px; }

/* 模态 / 提示 */
.toast {
  position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%);
  background: #1f2533; color: #fff; padding: 11px 18px; border-radius: 10px;
  font-size: 14px; opacity: 0; transition: opacity .2s; pointer-events: none; z-index: 50;
}
.toast.show { opacity: .95; }

/* 管理员 */
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; }
th { background: #f0f3fa; }
.ok { color: var(--ok); font-weight: 700; }
.stat-grid { display: flex; flex-wrap: wrap; gap: 14px; margin: 12px 0; }
.stat { background: #f0f3fa; border-radius: 10px; padding: 12px 16px; min-width: 130px; }
.stat .n { font-size: 22px; font-weight: 700; color: var(--primary-d); }
.stat .t { font-size: 13px; color: var(--muted); }
input[type=password], input[type=text] {
  padding: 9px 12px; border: 1.5px solid var(--line); border-radius: 9px; font-size: 15px; width: 240px;
}
.hidden { display: none !important; }
.scrollx { overflow-x: auto; }