/* =============================================================================
 * 成本核算在线实训 · 学生端
 * ========================================================================== */
:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --line: #dfe4ee;
  --line-strong: #c3cbdb;
  --text: #1f2733;
  --muted: #6d7789;
  --brand: #1f5fd6;
  --brand-soft: #e8f0ff;
  --given: #f0f2f6;
  --derived: #eaf3ff;
  --input: #fffdf0;
  --ok: #e6f7ec;
  --bad: #ffecec;
  --ok-line: #35a35c;
  --bad-line: #d84040;
  --shadow: 0 1px 3px rgba(24, 39, 75, .08), 0 8px 24px rgba(24, 39, 75, .06);
}

* { box-sizing: border-box; }

/* hidden 属性必须能压过下面的 display:flex 规则 */
[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  font: 14px/1.6 "Microsoft YaHei", "PingFang SC", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  display: flex;
  overflow: hidden;
}

/* ------------------------------------------------------------- 侧边栏 */
aside {
  width: 288px;
  flex: 0 0 288px;
  background: #fff;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.brand {
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--line);
}
.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.brand h1 { margin: 0; font-size: 15px; letter-spacing: .3px; }
.brand p { margin: 4px 0 0; font-size: 12px; color: var(--muted); }
#casePicker {
  width: 100%;
  margin-top: 10px;
  font: inherit;
  font-size: 12.5px;
  padding: 5px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
}

/* ---------------------------------------------------------- 案例背景卡片 */
.case-brief {
  margin-top: 10px;
  font-size: 11.5px;
  line-height: 1.65;
  color: #5a6580;
}
.cb-row { display: flex; gap: 6px; }
.cb-k {
  flex: 0 0 30px;
  color: #9aa4b8;
  text-align: justify;
  text-align-last: justify;
}
.cb-note {
  margin-top: 6px;
  padding: 7px 9px;
  background: #f7f9fd;
  border-radius: 6px;
  color: #55617c;
  max-height: 8.6em;
  overflow-y: auto;
}
.cb-methods { margin-top: 6px; }
.cb-methods summary {
  cursor: pointer;
  color: var(--brand);
  font-size: 11.5px;
  outline: none;
}
.cb-methods ul { margin: 6px 0 0; padding-left: 16px; color: #55617c; }
.cb-methods li { margin: 3px 0; }

#nav { flex: 1; overflow-y: auto; padding: 6px 0 20px; }

/* ---------------------------------------------------- 工作簿（可折叠分组） */
.nav-book { border-bottom: 1px solid #f0f3f8; }
.nav-book.pinned { background: #fbfcff; }
.nav-book.orientation { background: #f7fbff; }
.nav-book.summary { background: #fffdf7; }
.nav-book.orientation .nav-book-head { color: #0f7b6c; }
.nav-book.summary .nav-book-head { color: #b06a00; }
.nav-book.orientation .bk-badge { background: #e2f6f2; color: #0f7b6c; }
.nav-book.summary .bk-badge { background: #fdf0d8; color: #b06a00; }

.nav-book-head {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 9px 14px 9px 10px;
  border: 0;
  background: none;
  font: inherit;
  font-size: 12.5px;
  font-weight: 600;
  color: #33405c;
  text-align: left;
  cursor: pointer;
}
.nav-book-head:hover { background: #f6f8fc; }
.nav-book.pinned .nav-book-head { color: var(--brand); }

.caret { flex: 0 0 12px; font-size: 10px; color: #9aa4b8; }
.bk-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bk-badge {
  font-size: 10px;
  color: #93a0b8;
  background: #eef1f6;
  border-radius: 999px;
  padding: 0 6px;
}
.nav-book.pinned .bk-badge { background: var(--brand-soft); color: var(--brand); }

.nav-sheets { padding-bottom: 4px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 12px 6px 26px;
  border: 0;
  background: none;
  text-align: left;
  font: inherit;
  font-size: 12.5px;
  color: var(--text);
  cursor: pointer;
  border-left: 3px solid transparent;
}
.nav-item:hover { background: #f6f8fc; }
.nav-item.active { background: var(--brand-soft); border-left-color: var(--brand); font-weight: 600; }
.nav-item.readonly { color: var(--muted); }
.nav-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.badge {
  font-size: 11px;
  padding: 1px 7px;
  border-radius: 999px;
  background: #eef1f6;
  color: var(--muted);
  white-space: nowrap;
}
.badge.done { background: #e2f6e9; color: #2b7a48; }
.badge.low { background: #fdeaea; color: #b93434; }

.side-foot {
  border-top: 1px solid var(--line);
  padding: 12px 16px;
  font-size: 12px;
  color: var(--muted);
}
.side-foot #overall b { color: var(--text); }
.side-foot button { margin-top: 8px; width: 100%; }

/* ---------------------------------------------------------------- 主体 */
main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 14px 22px 12px;
}
.head-row { display: flex; align-items: flex-start; gap: 16px; }
.head-row h2 { margin: 0; font-size: 17px; }
.head-row p { margin: 3px 0 0; font-size: 12px; color: var(--muted); }

#toolbar {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

button {
  font: inherit;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 7px;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: .15s;
}
button:hover { border-color: var(--brand); color: var(--brand); }
button.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
button.primary:hover { background: #1a52bb; color: #fff; }
button.ghost { border-style: dashed; color: var(--muted); }

#notesWrap {
  margin-top: 10px;
  background: #f7f9fd;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 12.5px;
  color: #44506b;
}
#notesWrap.collapsed #notes { display: none; }
#notesWrap ul { margin: 0; padding-left: 18px; }
#notesWrap li { margin: 2px 0; }

#btnNotes {
  font-size: 12px;
  padding: 2px 10px;
  margin-bottom: 6px;
}

/* ---------------------------------------------------------------- 表格 */
#gridWrap {
  flex: 1;
  overflow: auto;
  padding: 16px 22px 40px;
}

table.grid {
  border-collapse: separate;
  border-spacing: 0;
  background: #fff;
  box-shadow: var(--shadow);
  border-radius: 8px;
  overflow: hidden;
  font-size: 13px;
}

table.grid th, table.grid td {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0;
  vertical-align: middle;
}

table.grid thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: #f7f9fd;
  font-weight: 600;
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  height: 24px;
  padding: 0 6px;
}
table.grid thead th.corner { left: 0; z-index: 4; width: 42px; }

table.grid th.rowhead {
  position: sticky;
  left: 0;
  z-index: 2;
  background: #f7f9fd;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  text-align: center;
  width: 42px;
  min-width: 42px;
}
table.grid thead th:first-child { z-index: 4; }

td.c {
  padding: 3px 9px;
  min-width: 82px;
  white-space: pre-wrap;
  word-break: keep-all;
  line-height: 1.35;
  text-align: right;
}
td.c.num { text-align: right; }
td.c.label { text-align: left; min-width: 118px; }
td.c.cross { text-align: center; }
td.c.empty { background: #fbfcfe; }

/* 标题 / 表头 */
td.c.title {
  text-align: center;
  font-weight: 700;
  font-size: 14px;
  background: #fff;
  white-space: nowrap;
}
td.c.hdr {
  text-align: center;
  font-weight: 600;
  font-size: 12px;
  color: #3c4964;
  background: #f7f9fd;
  white-space: pre;   /* 保留原始换行，且不自动折行 */
}

td.given { background: var(--given); color: #46506a; }
td.given.cross { background: #fff; color: #b9c0cf; text-align: center; font-size: 12px; }

td.derived { background: var(--derived); color: #1d4ea8; font-weight: 600; }
td.derived.null { background: #f6f8fc; color: #b9c0cf; font-weight: 400; }

td.input { background: var(--input); padding: 0; }

td.input.focus { outline: 2px solid var(--brand); outline-offset: -2px; }
td.ok { background: var(--ok) !important; }
td.bad { background: var(--bad) !important; }

.cell-input {
  width: 100%;
  min-width: 58px;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 13px;
  text-align: right;
  padding: 3px 9px;
  color: #8a5a00;
  outline: none;
}
.cell-input.memo { color: #6d7789; font-style: italic; }
td.ok .cell-input { color: #1d6b3c; }
td.bad .cell-input { color: #a92c2c; }

/* -------------------------------------------------------------- 结果条 */
#resultWrap {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 10px 22px;
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
#result .score { display: inline-flex; align-items: baseline; gap: 2px; }
#result .score .num { font-size: 30px; font-weight: 700; color: var(--brand); line-height: 1; }
#result .score .unit { font-size: 13px; color: var(--muted); }
#result .stat { font-size: 13px; color: var(--muted); display: inline-block; margin-right: 16px; }
#result .good { color: var(--ok-line); }
#result .bad-t { color: var(--bad-line); }
#result .hint { font-size: 11.5px; color: #98a1b3; }
#pos { margin-left: auto; font-size: 12px; color: var(--muted); }

.side-foot .ov-sub { margin-top: 3px; font-size: 11px; color: #9aa4b8; }
.badge.read { background: #e9f2ff; color: #2f6fd0; }

/* ------------------------------------------------------------ 备案信息 */
.filing {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed var(--line);
  font-size: 11px;
  line-height: 1.9;
  color: #9aa4b8;
}
.filing-row { display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: center; }
.filing a {
  color: #9aa4b8;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}
.filing a:hover { color: var(--brand); text-decoration: underline; }
.filing-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 3px;
  border-radius: 50%;
  background: #c6cddb;
  flex: 0 0 auto;
}
.filing a:hover .filing-dot { background: var(--brand); }
.filing-owner { color: #b6bdcc; }

/* ==================================================================
 * 应知应会内容页 / 随堂测试 / 实训报告
 * ================================================================== */
.page-doc {
  max-width: 940px;
  margin: 0 auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 26px 34px 34px;
  font-size: 13.5px;
  line-height: 1.85;
  color: #2c3547;
}
.page-title { margin: 0 0 4px; font-size: 20px; }
.page-sub { margin: 0 0 20px; color: var(--muted); font-size: 12.5px; }

.doc-h {
  margin: 26px 0 10px;
  font-size: 15px;
  padding-left: 10px;
  border-left: 4px solid var(--brand);
  color: #16233c;
}
.doc-p { margin: 8px 0; }
.doc-list, .doc-steps { margin: 8px 0; padding-left: 22px; }
.doc-list li, .doc-steps li { margin: 4px 0; }
.doc-steps li::marker { color: var(--brand); font-weight: 700; }

.doc-kv {
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.kv-row { display: flex; border-bottom: 1px solid #eef1f6; }
.kv-row:last-child { border-bottom: 0; }
.kv-k {
  flex: 0 0 130px;
  padding: 7px 12px;
  background: #f7f9fd;
  color: #55617c;
  font-weight: 600;
  font-size: 12.5px;
}
.kv-v { padding: 7px 12px; flex: 1; }

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 12.5px;
}
.doc-table th, .doc-table td {
  border: 1px solid var(--line);
  padding: 7px 10px;
  text-align: left;
  vertical-align: top;
}
.doc-table th { background: #f4f7fc; font-weight: 600; color: #33405c; }
.doc-table td.first { color: #33405c; font-weight: 600; background: #fbfcfe; }

.doc-formula {
  margin: 12px 0;
  padding: 11px 16px;
  background: #eef4ff;
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  color: #1d3f7d;
  font-weight: 600;
  overflow-x: auto;
}
.doc-note {
  margin: 12px 0;
  padding: 11px 14px 11px 16px;
  border-radius: 8px;
  font-size: 12.8px;
  line-height: 1.75;
}
.doc-note.info { background: #eefaf6; border-left: 4px solid #17a673; color: #14594a; }
.doc-note.warn { background: #fff7e8; border-left: 4px solid #e8a33d; color: #7a5210; }
.note-tag {
  display: inline-block;
  margin-right: 8px;
  padding: 0 7px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(255, 255, 255, .75);
}

/* ------------------------------------------------------------ 随堂测试 */
.quiz-meta {
  margin: 0 0 18px;
  padding: 9px 14px;
  background: #f7f9fd;
  border-radius: 8px;
  font-size: 12.5px;
  color: #55617c;
}
.quiz-sec-h {
  margin: 26px 0 6px;
  font-size: 15px;
  padding-left: 10px;
  border-left: 4px solid var(--brand);
}
.lv {
  margin-left: 10px;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  vertical-align: middle;
}
.lv-easy { background: #e2f6e9; color: #2b7a48; }
.lv-hard { background: #fdeaea; color: #b93434; }
.quiz-sec-note { margin: 0 0 12px; color: var(--muted); font-size: 12px; }

.quiz-q {
  margin: 0 0 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fdfefe;
}
.quiz-q.ok { border-color: #8fd6ab; background: #f4fcf7; }
.quiz-q.bad { border-color: #f0a9a9; background: #fff6f6; }

.q-stem { font-weight: 600; margin-bottom: 10px; line-height: 1.7; }
.q-no { color: var(--brand); margin-right: 6px; }
.q-type, .q-tag {
  margin-left: 8px;
  padding: 0 7px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 400;
  vertical-align: middle;
}
.q-type { background: #eef1f6; color: #6d7789; }
.q-tag { background: #eef4ff; color: #2f6fd0; }

.q-opts { display: flex; flex-direction: column; gap: 6px; }
.q-opt {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 7px 11px;
  border: 1px solid #e6eaf2;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
  transition: .12s;
}
.q-opt:hover { background: #f8fafd; border-color: #cfd8e8; }
.q-opt.on { background: #eef4ff; border-color: var(--brand); }
.q-opt input { margin-top: 4px; accent-color: var(--brand); }
.opt-i {
  flex: 0 0 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  border-radius: 5px;
  background: #eef1f6;
  color: #55617c;
  font-size: 11.5px;
  font-weight: 700;
}
.q-opt.on .opt-i { background: var(--brand); color: #fff; }
.opt-t { flex: 1; }

.q-explain {
  margin-top: 10px;
  padding: 9px 12px;
  background: #f7f9fd;
  border-radius: 7px;
  font-size: 12.5px;
  color: #4a5568;
  display: none;
}
.quiz-q.ok .q-explain, .quiz-q.bad .q-explain { display: block; }
.q-explain b { color: var(--brand); }

.quiz-bar { display: flex; gap: 10px; margin-top: 22px; }
.quiz-result {
  margin-top: 18px;
  padding: 16px 20px;
  background: #f7f9fd;
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
.quiz-result:empty { display: none; }
.quiz-result .score { display: inline-flex; align-items: baseline; gap: 2px; }
.quiz-result .score .num { font-size: 34px; font-weight: 700; color: var(--brand); line-height: 1; }
.quiz-result .score .unit { font-size: 13px; color: var(--muted); }
.quiz-result .stat { font-size: 13px; color: var(--muted); }
.quiz-result .good { color: var(--ok-line); }
.quiz-result .pass { color: var(--ok-line); font-weight: 700; }
.quiz-result .fail { color: var(--bad-line); font-weight: 700; }
.quiz-result .hint { font-size: 11.5px; color: #98a1b3; flex-basis: 100%; }

/* ------------------------------------------------------------ 实训报告 */
.rep-item { margin: 16px 0 20px; }
.rep-label { font-weight: 600; margin-bottom: 5px; line-height: 1.7; }
.rep-no {
  display: inline-block;
  min-width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  margin-right: 8px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-size: 11.5px;
}
.rep-hint { font-size: 12px; color: var(--muted); margin-bottom: 6px; padding-left: 28px; }
.rep-input {
  width: 100%;
  min-height: 74px;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font: inherit;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
  resize: vertical;
  outline: none;
}
.rep-input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(31, 95, 214, .1); }
.rep-count { display: block; margin-top: 4px; font-size: 11.5px; color: #9aa4b8; text-align: right; }
.rep-count.ok { color: #2b7a48; }
.rep-count.warn { color: #b06a00; }
.rep-stat { margin-top: 14px; font-size: 12.5px; color: var(--muted); }
.rep-stat b { color: var(--text); }

/* ==================================================================
 * 登录层 / 在线模式点缀
 * ================================================================== */
.login-layer {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eef3fb 0%, #e4ecf9 60%, #e9f1ff 100%);
}
body.locked { overflow: hidden; }
body.locked aside, body.locked main { visibility: hidden; }

.login-card {
  width: 360px;
  padding: 34px 34px 26px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 10px 40px rgba(24, 39, 75, .12), 0 2px 8px rgba(24, 39, 75, .06);
}
.login-card h1 { margin: 0 0 4px; font-size: 18px; text-align: center; }
.login-sub { margin: 0 0 22px; text-align: center; font-size: 12.5px; color: var(--muted); }

.login-field { display: block; margin-bottom: 14px; }
.login-field span { display: block; font-size: 12.5px; color: #55617c; margin-bottom: 5px; }
.login-field input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font: inherit;
  font-size: 14px;
  outline: none;
  transition: .15s;
}
.login-field input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(31, 95, 214, .12); }

.login-btn { width: 100%; margin-top: 6px; padding: 10px; font-size: 14px; }
.login-msg {
  margin-bottom: 12px;
  padding: 8px 12px;
  border-radius: 7px;
  background: #fdeaea;
  color: #a92c2c;
  font-size: 12.5px;
}
.login-foot { margin: 16px 0 0; text-align: center; font-size: 11.5px; color: #9aa4b8; }

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border: 1px solid #d8e3f5;
  background: #f4f8ff;
  border-radius: 999px;
  font: inherit;
  font-size: 12px;
  color: #1d3f7d;
  cursor: pointer;
  transition: .15s;
  flex: 0 0 auto;
  white-space: nowrap;
}
.user-chip:hover { border-color: var(--brand); background: #eaf2ff; }
.uc-name { font-weight: 600; }
.uc-caret { font-size: 9px; color: #8fa4c8; }

/* ---------------------------------------------------------- 账号设置弹窗 */
.modal-layer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(24, 39, 75, .35);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-card {
  width: 400px;
  max-height: 90vh;
  overflow-y: auto;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 18px 60px rgba(24, 39, 75, .25);
  padding: 22px 26px 18px;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.modal-head h2 { margin: 0; font-size: 16px; }
.modal-x {
  border: 0;
  background: none;
  font-size: 22px;
  line-height: 1;
  color: #9aa4b8;
  cursor: pointer;
  padding: 0 4px;
}
.modal-x:hover { color: var(--text); }

.modal-info {
  border: 1px solid var(--line);
  border-radius: 9px;
  overflow: hidden;
  margin-bottom: 18px;
}
.mi-row { display: flex; border-bottom: 1px solid #eef1f6; font-size: 12.5px; }
.mi-row:last-child { border-bottom: 0; }
.mi-k { flex: 0 0 72px; padding: 7px 12px; background: #f7f9fd; color: #55617c; }
.mi-v { padding: 7px 12px; flex: 1; color: var(--text); }

.modal-form h3 {
  margin: 0 0 12px;
  font-size: 13.5px;
  color: #33405c;
  padding-left: 9px;
  border-left: 3px solid var(--brand);
}
.modal-foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  text-align: center;
}
.login-msg.ok { background: #e2f6e9; color: #2b7a48; }

.global-notice {
  margin-top: 10px;
  padding: 8px 12px;
  background: #fff7e8;
  border-left: 4px solid #e8a33d;
  border-radius: 0 8px 8px 0;
  font-size: 12.5px;
  color: #7a5210;
}
.mode-tip {
  font-size: 11.5px;
  color: #2b7a48;
  background: #e2f6e9;
  border-radius: 999px;
  padding: 3px 10px;
}

@media (max-width: 900px) {
  aside { display: none; }
}