:root {
  --primary: #4f6ef7;
  --primary-dark: #3b56d4;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2733;
  --muted: #6b7483;
  --border: #e4e8f0;
  --danger: #d64545;
  --ok: #23875a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.survey-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

.survey-header { text-align: center; margin-bottom: 20px; }
.survey-header h1 { font-size: 26px; margin: 0 0 6px; }
.survey-header .subtitle { color: var(--muted); margin: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(20, 30, 60, 0.04);
}

.round-head { margin-bottom: 18px; }
.badge {
  display: inline-block;
  background: #eef1ff;
  color: var(--primary-dark);
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 14px;
}
.stage-hint {
  margin-top: 10px;
  background: #fffbe8;
  border: 1px solid #f1dfa8;
  border-left: 4px solid #e5b93c;
  color: #6f5919;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.65;
}
.stage-hint:empty { display: none; }

.question { padding: 16px 0; border-bottom: 1px dashed var(--border); }
.question:last-of-type { border-bottom: none; }
.q-title { font-weight: 600; margin-bottom: 10px; }
.req { color: var(--danger); margin-left: 2px; }

.subquestion {
  margin: 4px 0 4px 18px;
  padding: 12px 0 12px 14px;
  border-left: 3px solid var(--border);
  background: #f8fafd;
}
.subquestion.hidden { display: none; }
.sub-mark { color: var(--muted); font-size: 12px; margin-top: 6px; }

.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.opt input { width: 16px; height: 16px; }

.textinput {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}
.textinput:focus { outline: 2px solid #c8d2ff; border-color: var(--primary); }

.blank-row { display: flex; align-items: center; gap: 8px; }
.blank-row .textinput { flex: 1; min-width: 0; }
.unit { color: var(--muted); white-space: nowrap; font-size: 15px; }

.form-actions { margin-top: 20px; text-align: right; }

.btn {
  display: inline-block;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 9px 18px;
  border-radius: 8px;
  font: inherit;
  cursor: pointer;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn:hover { text-decoration: none; }

.notice {
  background: #fff8e6;
  border: 1px solid #f1dfa8;
  color: #8a6d1a;
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 16px;
}
.banner { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; }
.banner.done { background: #e8f7ef; border: 1px solid #bfe6d2; color: var(--ok); }
.banner.err { background: #fdecec; border: 1px solid #f2c4c4; color: var(--danger); }

.survey-footer { text-align: center; color: var(--muted); font-size: 13px; margin-top: 24px; }

.thanks { text-align: center; }
.thanks-icon {
  width: 56px; height: 56px; line-height: 56px;
  border-radius: 50%; background: #e8f7ef; color: var(--ok);
  font-size: 28px; margin: 0 auto 12px;
}

.muted { color: var(--muted); }

/* 受访者阶段进度 */
.progress {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.progress li {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
}
.progress li.current { border-color: var(--primary); background: #eef1ff; }
.progress li.done { border-color: #bfe6d2; background: #e8f7ef; }
.progress li.locked { opacity: 0.55; }
.progress .pstep { color: var(--text); }
.progress .pstep:hover { text-decoration: none; }
.progress .pmark { color: var(--muted); font-size: 12px; }

/* 干预内容 */
.intervention { margin-bottom: 16px; }
.intervention .int-title { margin: 0 0 10px; font-size: 17px; }
.intervention .int-content {
  background: #f8fafd;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  white-space: normal;
}

/* 截图上传 */
.upload-preview {
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: #f8fafd;
  max-width: 480px;
}
.upload-preview img { display: block; width: 100%; height: auto; }

.upload-section {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px dashed var(--border);
}
.upload-prompt {
  background: #fff8e6;
  border: 1px solid #f1dfa8;
  color: #6f5919;
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 12px;
  line-height: 1.65;
}

/* 管理后台缩略图 */
.thumb { width: 72px; height: 48px; object-fit: cover; border-radius: 6px; border: 1px solid var(--border); display: block; }
.done-tag { color: var(--ok); font-weight: 600; }

.bar { height: 8px; background: #e7ebf4; border-radius: 4px; overflow: hidden; margin: 4px 0; min-width: 90px; }
.bar .fill { height: 100%; background: var(--primary); border-radius: 4px; }

/* 管理员 */
.admin-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: #172033;
  color: #d7dce7;
  padding: 20px 0;
  flex-shrink: 0;
}
.brand { font-size: 18px; font-weight: 700; color: #fff; padding: 0 20px 18px; }
.sidebar nav a {
  display: block;
  color: #b9c1d1;
  padding: 11px 20px;
  border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: #1e2941; color: #fff; text-decoration: none; }
.sidebar nav a.active { background: #1e2941; color: #fff; border-left-color: var(--primary); }
.sidebar-foot { padding: 20px; font-size: 13px; }
.sidebar-foot a { color: #8fa0bd; }

.content { flex: 1; padding: 28px 32px 64px; min-width: 0; }
.content h2 { margin-top: 0; }
.content h3 { margin: 0 0 12px; font-size: 16px; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; margin: 18px 0; }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 18px; text-align: center; color: var(--text);
}
.stat:hover { border-color: var(--primary); text-decoration: none; }
.stat .num { font-size: 30px; font-weight: 700; color: var(--primary); }
.stat .lab { color: var(--muted); font-size: 14px; }

.hint { background: #eef1ff; border: 1px solid #d7ddfb; color: #39498f; padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; }

.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.tab {
  padding: 7px 16px; border-radius: 999px; border: 1px solid var(--border);
  background: #fff; color: var(--text);
}
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.tab:hover { text-decoration: none; }

.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.table th { color: var(--muted); font-weight: 600; background: #f8fafd; }
.table tr:hover td { background: #fafbfe; }
.table-scroll { overflow-x: auto; }
.table.matrix th { min-width: 120px; }

.actions { white-space: nowrap; }
.actions .mini, .actions .btn { margin-right: 6px; }
.inline { display: inline; }
.mini {
  border: 1px solid var(--border); background: #fff; color: var(--text);
  padding: 4px 10px; border-radius: 6px; font: inherit; font-size: 13px; cursor: pointer;
}
.mini:hover { border-color: var(--primary); color: var(--primary); }
.mini.danger:hover { border-color: var(--danger); color: var(--danger); }
.mini:disabled { opacity: 0.45; cursor: not-allowed; }

.linkbox { width: 260px; max-width: 100%; padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px; font-size: 12px; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 14px; color: var(--muted); margin-bottom: 5px; }
.field input[type=text], .field input[type=password], .field input[type=number],
.field input[type=email], .field select, .field textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit;
}
.field.check label { display: flex; align-items: center; gap: 8px; color: var(--text); }
.field.check input { width: 16px; height: 16px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
  .admin-shell { flex-direction: column; }
  .sidebar { width: 100%; }
  .sidebar nav { display: flex; flex-wrap: wrap; }
  .sidebar nav a { border-left: none; }
}

.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 14px; }
.toolbar input[type=text], .toolbar input:not([type]) {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit;
}
.toolbar .check { display: inline-flex; align-items: center; gap: 6px; color: var(--text); }
.toolbar .check input { width: 16px; height: 16px; }

.share-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.share-row .linkbox { flex: 1 1 220px; min-width: 180px; }
.share-qr { margin-top: 14px; }
.share-qr img { width: 170px; height: 170px; border: 1px solid var(--border); border-radius: 10px; }
.share-qr p { margin: 6px 0 0; }

.pair-role {
  display: inline-block; width: 20px; height: 20px; line-height: 20px;
  text-align: center; border-radius: 50%; color: #fff; font-size: 12px; font-weight: 700;
}
.pair-role.a { background: var(--primary); }
.pair-role.b { background: #e5a33c; }

/* 登录 */
.login-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 32px; width: 360px; max-width: 100%;
  display: flex; flex-direction: column; gap: 14px;
  box-shadow: 0 8px 30px rgba(20, 30, 60, 0.08);
}
.login-card h1 { margin: 0; font-size: 22px; }
.login-card input { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit; }

/* 公开入口落地页 */
.landing-wrap { max-width: 480px; margin: 0 auto; padding: 28px 16px 56px; }
.landing-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  overflow: hidden; box-shadow: 0 8px 30px rgba(20, 30, 60, 0.10); text-align: center;
}
.landing-cover { width: 100%; height: 230px; background: #eef1ff; }
.landing-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.landing-body { padding: 24px 22px 28px; }
.landing-body h1 { font-size: 26px; margin: 0 0 8px; }
.landing-body .subtitle { color: var(--muted); margin: 0 0 20px; }
.landing-btn {
  display: block; width: 100%; padding: 16px 20px; font-size: 18px; font-weight: 700;
  color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 999px; box-shadow: 0 10px 24px rgba(79, 110, 247, 0.26);
}
.landing-btn:hover { text-decoration: none; transform: translateY(-1px); }
.landing-btn:active { transform: translateY(0); }
.landing-hint { color: var(--muted); font-size: 13px; margin-top: 16px; }
.landing-resume { display: flex; gap: 8px; margin-top: 12px; }
.landing-resume .textinput { flex: 1; min-width: 0; }
.landing-resume .btn { white-space: nowrap; }
.landing-qr { margin-top: 20px; padding-top: 18px; border-top: 1px dashed var(--border); }
.landing-qr img { width: 180px; height: 180px; border: 1px solid var(--border); border-radius: 10px; }
.landing-qr .landing-hint { margin-top: 8px; }

.username-note {
  background: #eef1ff; border: 1px solid #d7ddfb; color: #39498f;
  padding: 12px 16px; border-radius: 10px; margin: 8px 0;
}
.username-note strong { font-size: 18px; }
.username-field { text-align: left; margin-bottom: 16px; }
.username-field label { display: block; font-size: 14px; color: var(--muted); margin-bottom: 6px; }
.banner.uname { background: #eef1ff; border: 1px solid #d7ddfb; color: #39498f; }