:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --border: #e2e6ea;
  --text: #1c2733;
  --muted: #6b7684;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --ok: #16a34a;
  --err: #dc2626;
  --lock: #f0f4f8;
  --shadow: 0 2px 12px rgba(16, 32, 55, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}
.hidden { display: none !important; }

.center-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 30px 34px;
  max-width: 420px;
  width: 100%;
}
.card h1 { margin: 0 0 4px; font-size: 22px; }
.card h2 { margin: 0; font-size: 20px; }
.card .sub { color: var(--muted); margin: 0 0 20px; }

.field { margin-bottom: 14px; }
.field label { display: block; margin-bottom: 6px; color: var(--muted); font-size: 14px; }
.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
}
.field input:focus { outline: none; border-color: var(--primary); }

.btn {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.15s;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { background: #f0f2f5; }
.btn.ghost:disabled { opacity: 0.4; cursor: not-allowed; }

.err { color: var(--err); margin: 8px 0; min-height: 18px; }
.ok { color: var(--ok); margin: 8px 0; min-height: 18px; }

/* Topbar */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.topbar .brand { font-weight: 700; font-size: 16px; }
.topbar .user { color: var(--muted); }
.topbar .progress { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.topbar .progress .bar { width: 120px; height: 8px; background: #e9edf2; border-radius: 6px; overflow: hidden; }
.topbar .progress .bar .fill { height: 100%; background: var(--primary); width: 0; transition: width 0.2s; }

/* Layout */
.layout { display: flex; gap: 22px; padding: 20px; max-width: 1400px; margin: 0 auto; align-items: flex-start; }
@media (max-width: 860px) { .layout { flex-direction: column; } }

.left { flex: 1.3; }
.img-box {
  background: #0e1116;
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 78vh;
  width: 100%;
  position: relative;
}
.img-box img { max-width: 100%; max-height: 88vh; width: auto; height: auto; object-fit: contain; display: block; }
.img-loading {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  display: flex; align-items: center; justify-content: center;
  background: #0e1116;
  z-index: 10;
}
.img-loading span { color: #8a93a3; font-size: 16px; }
.img-loading.hidden { display: none; }
.img-meta { display: flex; justify-content: space-between; margin-top: 8px; color: var(--muted); font-size: 14px; }

.right { flex: 1; min-width: 320px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }

section h2 { font-size: 17px; margin: 0 0 6px; display: flex; align-items: center; gap: 8px; }
.tag { background: var(--primary); color: #fff; font-size: 13px; padding: 2px 8px; border-radius: 6px; }
.tag2 { background: #7c3aed; }
.hint { color: var(--muted); margin: 0 0 14px; }

/* EASI 单选 */
.easi-group { display: grid; gap: 6px; }
.easi-name { font-weight: 600; font-size: 15px; display: flex; align-items: baseline; gap: 6px; }
.easi-name small { font-size: 12px; color: var(--muted); font-weight: 400; }
.easi-group .radio-row { display: flex; gap: 8px; }
.easi-group .radio-opt { flex: 1; text-align: center; border: 1px solid var(--border); border-radius: 8px; padding: 8px 4px; cursor: pointer; }
.easi-group .radio-opt span { display: block; font-size: 20px; font-weight: 700; }
.easi-group .radio-opt small { display: block; color: var(--muted); font-size: 11px; }
.easi-group .radio-opt.sel { border-color: var(--primary); background: #eef4ff; color: var(--primary); }

/* step2 */
.locked { background: var(--lock); }
.loading-disabled { opacity: 0.5; pointer-events: none; }
.exp-box { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin-bottom: 14px; }
.exp-label { color: var(--muted); font-size: 13px; margin-bottom: 4px; }
.exp-en p, .exp-zh p { margin: 0; }
.exp-en { border-bottom: 1px dashed var(--border); padding-bottom: 10px; margin-bottom: 10px; }
.exp-en p { color: #333; }
.exp-zh p { color: var(--text); }
/* 4 条匿名解释卡片 */
.exp-card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin-bottom: 14px; }
.exp-card .exp-head { font-weight: 700; color: var(--primary, #2a7); margin-bottom: 8px; font-size: 14px; }
.exp-card .exp-en { border-bottom: 1px dashed var(--border); padding-bottom: 8px; margin-bottom: 8px; }
.exp-card .exp-en p { color: #333; font-size: 13px; line-height: 1.5; }
.exp-card .exp-zh p { color: var(--text); font-size: 13px; line-height: 1.5; }
.exp-card .rating-grid { margin-top: 8px; grid-template-columns: 1fr 1fr; gap: 10px; }
/* 评分标准说明区 */
.criteria-box { background: #f6f9f7; border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; margin-bottom: 14px; font-size: 13px; }
.criteria-box summary { cursor: pointer; font-weight: 600; color: #2a7; }
.criteria-content { margin-top: 8px; }
.criteria-content h4 { margin: 8px 0 4px; font-size: 13px; color: #333; }
.criteria-content .crit-q { margin: 0 0 6px; color: var(--muted); }
.criteria-table { width: 100%; border-collapse: collapse; margin-bottom: 8px; font-size: 12px; }
.criteria-table th, .criteria-table td { border: 1px solid var(--border); padding: 4px 8px; text-align: left; }
.criteria-table th { background: var(--border, #e5e5e5); }
.criteria-note { color: var(--muted); font-size: 12px; margin-top: 4px; }

.rating-grid { display: grid; gap: 14px; }
.rate-field label { display: block; color: var(--muted); margin-bottom: 6px; font-size: 14px; }
.radio-row { display: flex; gap: 10px; }
.radio-opt { flex: 1; text-align: center; border: 1px solid var(--border); border-radius: 8px; padding: 8px 4px; cursor: pointer; }
.radio-opt input { display: none; }
.radio-opt span { display: block; font-size: 18px; font-weight: 700; }
.radio-opt small { display: block; color: var(--muted); font-size: 11px; }
.radio-opt.sel { border-color: var(--primary); background: #eef4ff; color: var(--primary); }
.radio-opt:has(input:checked) { border-color: var(--primary); background: #eef4ff; color: var(--primary); }
.note-field textarea { width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 14px; resize: vertical; }

.nav-footer { display: flex; align-items: center; justify-content: space-between; max-width: 1200px; margin: 0 auto; padding: 0 20px 24px; gap: 16px; }
.nav-footer #nav-info { color: var(--muted); }