/* AI赋能多元统计分析综合虚拟仿真实验平台 */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #1f5fbf; --primary-dark: #174a99; --primary-light: #e8f0fd;
  --success: #1d9e74; --warn: #c77c11; --danger: #c53030;
  --bg: #f4f6fa; --card: #ffffff; --border: #dde3ec; --text: #243044; --muted: #6b7a90;
  --sidebar-w: 252px; --ai-w: 330px;
}
body { font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif; background: #f4f6fa; color: #243044; font-size: 14px; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 14px; padding: 7px 10px; border: 1px solid #dde3ec; border-radius: 6px; outline: none; }
input:focus, select:focus, textarea:focus { border-color: #1f5fbf; }
textarea { width: 100%; resize: vertical; }
.btn { display: inline-block; padding: 8px 18px; border: none; border-radius: 6px; background: #1f5fbf; color: #fff; font-size: 14px; }
.btn:hover { background: #174a99; }
.btn:disabled { background: #9db6dd; cursor: not-allowed; }
.btn.ghost { background: #fff; color: #1f5fbf; border: 1px solid #1f5fbf; }
.btn.small { padding: 4px 12px; font-size: 13px; }
.btn.success { background: #1d9e74; }
.hidden { display: none !important; }
.muted { color: #6b7a90; }

/* ---------- 登录 ---------- */
#login-view { min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1c3f78 0%, #2a6bc9 55%, #4b93e8 100%); }
.login-card { background: #fff; border-radius: 14px; padding: 40px 44px; width: 420px; box-shadow: 0 18px 50px rgba(10,30,70,.35); }
.login-card h1 { font-size: 21px; margin-bottom: 4px; color: #174a99; }
.login-card .sub { color: #6b7a90; font-size: 13px; margin-bottom: 24px; }
.login-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.login-tabs button { flex: 1 1 0%; padding: 9px; border: 1px solid #dde3ec; background: #fff; border-radius: 8px; }
.login-tabs button.active { background: #e8f0fd; border-color: #1f5fbf; color: #174a99; font-weight: bold; }
.login-card label { display: block; margin: 12px 0 5px; font-size: 13px; color: #6b7a90; }
.login-card input { width: 100%; }
.login-card .btn { width: 100%; margin-top: 22px; padding: 11px; font-size: 15px; }
.login-err { color: #c53030; font-size: 13px; margin-top: 10px; min-height: 18px; }
.login-foot { margin-top: 18px; font-size: 12px; color: #6b7a90; text-align: center; }

/* ---------- 主框架 ---------- */
#app-view { display: none; height: 100vh; flex-direction: column; }
.topbar { background: #174a99; color: #fff; height: 52px; display: flex; align-items: center; padding: 0 18px; gap: 14px; flex-shrink: 0; }
.topbar .logo { font-weight: bold; font-size: 15px; }
.topbar .spacer { flex: 1 1 0%; }
.topbar .meta { font-size: 12px; opacity: .85; }
.topbar button { background: rgba(255,255,255,.14); border: none; color: #fff; padding: 6px 14px; border-radius: 6px; font-size: 13px; }
.topbar button:hover { background: rgba(255,255,255,.28); }
.main { flex: 1 1 0%; display: flex; min-height: 0; }

/* 步骤导航 */
.steps-nav { width: 252px; background: #fff; border-right: 1px solid #dde3ec; overflow-y: auto; flex-shrink: 0; }
.steps-nav h3 { font-size: 13px; color: #6b7a90; padding: 14px 14px 6px; font-weight: normal; }
.phase-label { font-size: 12px; color: #1f5fbf; font-weight: bold; padding: 10px 14px 4px; }
.step-item { display: flex; align-items: center; gap: 8px; padding: 8px 14px; cursor: pointer; border-left: 3px solid transparent; }
.step-item:hover { background: #f2f6fd; }
.step-item.active { background: #e8f0fd; border-left-color: #1f5fbf; }
.step-item.done .num { background: #1d9e74; }
.step-item.locked { opacity: .45; }
.step-item .num { width: 20px; height: 20px; border-radius: 50%; background: #c3cede; color: #fff; font-size: 11px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.step-item.active .num { background: #1f5fbf; }
.step-item .t { font-size: 12.5px; line-height: 1.3; }

/* 中央区 */
.center { min-height: 0; flex: 1 1 0%; overflow-y: auto; padding: 18px 22px; min-width: 0; }
.step-head { margin-bottom: 14px; }
.step-head h2 { font-size: 19px; color: #174a99; }
.step-head .desc { color: #6b7a90; margin-top: 4px; font-size: 13px; }
.card { background: #ffffff; border: 1px solid #dde3ec; border-radius: 10px; padding: 16px 18px; margin-bottom: 14px; }
.card h4 { font-size: 14px; margin-bottom: 10px; color: #243044; }
.card h4 .tag { font-size: 11px; background: #e8f0fd; color: #174a99; padding: 2px 8px; border-radius: 10px; margin-left: 8px; font-weight: normal; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.result-msg { margin-top: 10px; padding: 9px 12px; border-radius: 6px; font-size: 13px; display: none; }
.result-msg.ok { display: block; background: #e7f7f0; color: #11694f; border: 1px solid #b3e3d2; }
.result-msg.err { display: block; background: #fdeeee; color: #c53030; border: 1px solid #f3c3c3; }
.result-msg.info { display: block; background: #fff7e8; color: #c77c11; border: 1px solid #f0dcae; }

/* 表格 */
table.data { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.data th, table.data td { border: 1px solid #dde3ec; padding: 5px 8px; text-align: center; }
table.data th { background: #f0f4fa; color: #243044; position: sticky; top: 0; }
table.data tr:hover td { background: #f7faff; }
.scrollbox { max-height: 340px; overflow: auto; border: 1px solid #dde3ec; border-radius: 8px; }

/* 单选/选项 */
.opts { display: flex; flex-direction: column; gap: 8px; }
.opts label { display: flex; gap: 8px; align-items: flex-start; padding: 9px 12px; border: 1px solid #dde3ec; border-radius: 8px; cursor: pointer; }
.opts label:hover { border-color: #1f5fbf; }
.opts label.sel { border-color: #1f5fbf; background: #e8f0fd; }
.opts input { margin-top: 3px; }

/* AI 面板 */
.ai-panel { width: 330px; border-left: 1px solid #dde3ec; background: #fff; display: flex; flex-direction: column; flex-shrink: 0; }
.ai-head { padding: 12px 14px; border-bottom: 1px solid #dde3ec; display: flex; align-items: center; gap: 8px; }
.ai-head .dot { width: 9px; height: 9px; border-radius: 50%; background: #1d9e74; }
.ai-head b { font-size: 14px; }
.ai-head .src { font-size: 11px; color: #6b7a90; margin-left: auto; }
.ai-msgs { min-height: 0; flex: 1 1 0%; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.ai-msg { max-width: 92%; padding: 9px 12px; border-radius: 10px; font-size: 13px; line-height: 1.55; white-space: pre-wrap; }
.ai-msg.ai { background: #f1f5fc; border: 1px solid #dbe6f7; align-self: flex-start; border-top-left-radius: 2px; }
.ai-msg.user { background: #1f5fbf; color: #fff; align-self: flex-end; border-top-right-radius: 2px; }
.ai-input { border-top: 1px solid #dde3ec; padding: 10px; }
.ai-input textarea { height: 64px; font-size: 13px; }
.ai-input .row { margin-top: 8px; }
.chip { font-size: 12px; border: 1px solid #dde3ec; background: #f7f9fd; border-radius: 14px; padding: 4px 10px; color: #174a99; }
.chip:hover { border-color: #1f5fbf; }

/* 图表 */
.chart-box { width: 100%; overflow-x: auto; }
.chart-box svg { display: block; margin: 0 auto; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: #6b7a90; margin-top: 6px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; }

/* 校验片段 */
.seg { border: 1px solid #dde3ec; border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; display: flex; gap: 10px; align-items: flex-start; }
.seg input { margin-top: 4px; }
.seg .verdict { font-size: 12px; margin-top: 6px; padding: 6px 10px; border-radius: 6px; }
.seg .verdict.wrong-hit { background: #fdeeee; color: #c53030; }
.seg .verdict.correct-kept { background: #e7f7f0; color: #1d9e74; }

/* 教师看板 */
#teacher-view { display: none; height: 100vh; flex-direction: column; }
.stat-cards { display: flex; gap: 14px; margin-bottom: 16px; flex-wrap: wrap; }
.stat-card { background: #fff; border: 1px solid #dde3ec; border-radius: 10px; padding: 14px 22px; min-width: 140px; }
.stat-card .v { font-size: 26px; font-weight: bold; color: #174a99; }
.stat-card .k { font-size: 12px; color: #6b7a90; margin-top: 2px; }
.progress-bar { width: 90px; height: 8px; background: #e5eaf2; border-radius: 4px; overflow: hidden; display: inline-block; vertical-align: middle; margin-right: 6px; }
.progress-bar i { display: block; height: 100%; background: #1f5fbf; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 10px; }
.badge.g { background: #e7f7f0; color: #11694f; }
.badge.o { background: #fff3e0; color: #c77c11; }
.badge.b { background: #e8f0fd; color: #174a99; }
.modal-bg { position: fixed; top: 0; right: 0; bottom: 0; left: 0; background: rgba(20,30,50,.45); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal { background: #fff; border-radius: 12px; width: 720px; max-height: 84vh; overflow-y: auto; padding: 22px 26px; }
.modal h3 { margin-bottom: 12px; color: #174a99; }
.toolbar { display: flex; gap: 10px; margin-bottom: 14px; align-items: center; }