:root {
  --ink: #102033;
  --muted: #667385;
  --line: #d8e2df;
  --paper: #fbfcf8;
  --surface: #ffffff;
  --soft: #eef7f3;
  --primary: #0f766e;
  --primary-2: #0b5f59;
  --gold: #a56a16;
  --blue: #2563eb;
  --danger: #b42318;
  --ok: #157347;
  --warn: #b54708;
  --radius: 8px;
  --shadow: 0 16px 42px rgba(16, 32, 51, 0.11);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  background:
    linear-gradient(180deg, rgba(238, 247, 243, 0.94), rgba(251, 252, 248, 0.98) 420px),
    var(--paper);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button,
input,
select,
textarea {
  border-radius: var(--radius);
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(16, 32, 51, 0.08);
  background: rgba(251, 252, 248, 0.9);
  backdrop-filter: blur(14px);
}

.topbar-inner {
  display: grid;
  grid-template-columns: auto minmax(220px, 420px) auto;
  gap: 16px;
  align-items: center;
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 12px 0;
}

.brand {
  display: flex;
  gap: 10px;
  align-items: center;
  font-weight: 900;
}

.brand-mark,
.chapter-code {
  display: inline-grid;
  place-items: center;
  color: #fff;
  background: var(--primary);
  font-weight: 900;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
}

.brand-sub,
small,
.small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.search {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
}

.search input,
.admin-toolbar input,
.field input,
.field select,
.field textarea,
.calc-row input,
.filter-bar select,
.answer-form input,
.answer-form textarea,
.discussion-form textarea,
.mock-question textarea,
.user-row input,
.user-row select {
  width: 100%;
  border: 1px solid rgba(16, 32, 51, 0.15);
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
}

.search button,
.nav button,
.ghost-btn,
.primary-btn,
.gold-btn,
.danger-btn,
.tabs button,
.segmented button,
.chapter-card,
.mock-list button,
.mini-lessons button,
.chapter-toggle,
.metric,
.tool-card,
.stat-box {
  min-height: 40px;
  border: 1px solid rgba(16, 32, 51, 0.12);
  border-radius: var(--radius);
  padding: 9px 13px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.84);
}

.primary-btn,
.nav button.active,
.tabs button.active,
.segmented button.active,
.search button {
  border-color: transparent;
  color: #fff;
  background: var(--primary);
}

.gold-btn {
  border: 0;
  color: #fff;
  background: var(--gold);
}

.danger-btn {
  border: 0;
  color: #fff;
  background: var(--danger);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.56;
}

.nav {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.nav button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-icon {
  display: inline-grid;
  width: 22px;
  height: 22px;
  place-items: center;
  color: currentColor;
}

.nav-icon svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 48px;
}

.breadcrumbs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 4px 0 16px;
  color: var(--muted);
  font-size: 13px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 18px;
  min-height: 560px;
  overflow: hidden;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  background:
    linear-gradient(90deg, rgba(251, 252, 248, 0.96), rgba(251, 252, 248, 0.76) 54%, rgba(251, 252, 248, 0.18)),
    url("assets/math-hero.png") center right / cover no-repeat;
  box-shadow: var(--shadow);
}

.hero-main {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  padding: 42px;
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  border: 1px solid rgba(15, 118, 110, 0.25);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--primary);
  background: rgba(238, 247, 243, 0.86);
  font-size: 13px;
  font-weight: 900;
}

.hero h1 {
  max-width: 680px;
  margin: 20px 0 12px;
  font-size: 46px;
  line-height: 1.12;
  letter-spacing: 0;
}

.hero p {
  max-width: 620px;
  color: #405166;
}

.metric-row,
.dashboard-band,
.admin-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.metric,
.stat-box,
.tool-card {
  text-align: left;
  border: 1px solid rgba(16, 32, 51, 0.1);
  background: rgba(255, 255, 255, 0.82);
}

.metric:hover,
.stat-box:hover,
.tool-card:hover,
.chapter-card:hover,
.lesson-card:hover,
.mock-list button:hover,
.primary-btn:hover,
.ghost-btn:hover,
.gold-btn:hover,
.danger-btn:hover,
.chapter-toggle:hover,
.mini-lessons button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(16, 32, 51, 0.09);
}

.metric strong,
.stat-box strong,
.tool-card strong {
  display: block;
  font-size: 28px;
  line-height: 1.1;
}

.auth-panel,
.detail,
.panel,
.lesson-card,
.note-card,
.mock-paper,
.side-panel,
.analysis-card,
.user-row,
.report,
.empty-state {
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 10px 28px rgba(16, 32, 51, 0.06);
}

.auth-panel {
  align-self: stretch;
  margin: 22px;
}

.calm-panel {
  align-self: center;
}

.panel-head {
  padding: 20px 20px 8px;
}

.panel-head h2,
.section-title h2,
.admin-title h2,
.detail h2 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0;
}

.tabs,
.form {
  display: grid;
  gap: 10px;
  padding: 0 20px 20px;
}

.tabs {
  grid-template-columns: repeat(2, 1fr);
  padding-bottom: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  color: #344256;
  font-size: 13px;
  font-weight: 800;
}

.field textarea {
  min-height: 98px;
  resize: vertical;
}

.large-textarea {
  min-height: 180px !important;
}

.course-band,
.content-panel {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.guide-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: var(--radius);
  padding: 16px;
  background: linear-gradient(180deg, #ffffff, var(--soft));
}

.guide-panel h3,
.guide-panel p {
  margin: 0;
}

.guide-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.section-title,
.detail-title-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.chapter-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.tool-grid,
.ops-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.tool-card {
  display: grid;
  gap: 6px;
  padding: 16px;
}

.tool-card span {
  font-weight: 900;
}

.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.chapter-card {
  position: relative;
  display: grid;
  gap: 8px;
  min-height: 210px;
  padding: 16px;
  text-align: left;
  overflow: hidden;
}

.chapter-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--accent);
}

.chapter-number {
  display: block;
  color: var(--accent);
  font-weight: 900;
}

.card-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
}

.progress-line {
  position: relative;
  height: 16px;
  overflow: hidden;
  border-radius: 999px;
  background: #dfe8e5;
}

.progress-line i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #2fb49d);
}

.progress-line span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #102033;
  font-size: 11px;
  font-weight: 900;
}

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 20px;
}

.side-panel {
  position: sticky;
  top: 82px;
  align-self: start;
  padding: 14px;
}

.progress-ring {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.ring {
  display: grid;
  width: 68px;
  height: 68px;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--primary) var(--progress, 0deg), #e1e8e6 0);
  font-weight: 900;
}

.ring span {
  display: grid;
  width: 50px;
  height: 50px;
  place-items: center;
  border-radius: 50%;
  background: #fff;
}

.progress-copy {
  display: grid;
  gap: 2px;
}

.progress-copy p,
.progress-copy small {
  margin: 0;
}

.progress-copy small {
  color: var(--muted);
  line-height: 1.35;
}

.chapter-list {
  display: grid;
  gap: 10px;
  max-height: 62vh;
  overflow: auto;
  padding-right: 10px;
  scrollbar-width: auto;
}

.chapter-list::-webkit-scrollbar {
  width: 16px;
}

.chapter-list::-webkit-scrollbar-thumb {
  border-radius: 999px;
  border: 3px solid #f8fbfa;
  background: #8da19c;
}

.chapter-toggle {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 42px;
  gap: 9px;
  align-items: center;
  width: 100%;
  text-align: left;
}

.chapter-toggle span:nth-child(2) {
  min-width: 0;
  overflow: hidden;
}

.chapter-toggle strong,
.chapter-toggle small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.collapse-mark {
  display: grid;
  min-width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 999px;
  color: var(--primary);
  background: rgba(15, 118, 110, 0.08);
  font-size: 20px;
  line-height: 1;
}

.chapter-toggle.active {
  border-color: rgba(15, 118, 110, 0.38);
  background: var(--soft);
}

.chapter-code {
  width: 52px;
  height: 42px;
  border-radius: var(--radius);
  background: var(--accent);
}

.mini-lessons {
  display: grid;
  gap: 6px;
  margin-top: 6px;
  padding-left: 16px;
}

.mini-lessons button {
  min-height: 34px;
  text-align: left;
  font-size: 13px;
}

.mini-lessons button.active {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--soft);
}

.stat-box {
  padding: 16px;
}

.stat-box strong {
  color: var(--ink);
}

.stat-box span {
  color: var(--muted);
}

.featured {
  border-color: rgba(15, 118, 110, 0.35);
  background: linear-gradient(180deg, #ffffff, var(--soft));
}

.lesson-grid,
.analysis-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.lesson-card {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.lesson-card.selected {
  border-color: rgba(15, 118, 110, 0.38);
}

.lesson-card header,
.practice-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.lesson-card h3,
.note-card h3,
.mock-paper h3,
.analysis-card h3 {
  margin: 0;
}

.status,
.pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  width: fit-content;
  border: 1px solid rgba(16, 32, 51, 0.12);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 900;
  background: #f8faf8;
}

.status.done,
.status.approved,
.pill.ok {
  color: var(--ok);
  border-color: rgba(21, 115, 71, 0.25);
  background: rgba(21, 115, 71, 0.08);
}

.status.learning,
.status.pending,
.pill.warn {
  color: var(--warn);
  border-color: rgba(181, 71, 8, 0.25);
  background: rgba(181, 71, 8, 0.08);
}

.status.todo,
.status.rejected,
.pill.danger {
  color: var(--danger);
  border-color: rgba(180, 35, 24, 0.22);
  background: rgba(180, 35, 24, 0.08);
}

.pill.strong {
  color: var(--primary);
  border-color: rgba(15, 118, 110, 0.25);
  background: var(--soft);
}

.pills,
.row-actions,
.segmented,
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.detail-header {
  padding: 22px;
  border-bottom: 1px solid rgba(16, 32, 51, 0.08);
}

.detail-body {
  display: grid;
  gap: 20px;
  padding: 22px;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 18px;
}

.step-list {
  display: grid;
  gap: 8px;
  padding-left: 22px;
}

.section-mini-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.formula-box,
.worked,
.practice-row,
.solution {
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  padding: 12px;
  background: #f8fbfa;
}

.practice-row,
.solution {
  display: grid;
  gap: 12px;
}

.formula-box {
  display: grid;
  gap: 8px;
  border-left-color: var(--gold);
  overflow-x: auto;
}

.formula-box math {
  font-size: 20px;
}

.formula-box code {
  white-space: normal;
}

.rubric,
.panel {
  padding: 16px;
}

.rubric ul {
  padding-left: 20px;
}

.practice-list,
.notes-grid,
.user-list {
  display: grid;
  gap: 12px;
}

.practice-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
}

.exercise-jump-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  padding: 10px;
  border: 1px solid rgba(16, 32, 51, 0.08);
  border-radius: var(--radius);
  background: #fff;
}

.admin-section {
  display: grid;
  gap: 14px;
}

.admin-toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto auto auto;
  gap: 10px;
  align-items: center;
}

.ops-card {
  display: grid;
  gap: 10px;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  padding: 16px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 10px 28px rgba(16, 32, 51, 0.05);
}

.ops-card h3,
.ops-card p {
  margin: 0;
}

.ops-card p {
  color: var(--muted);
}

.mini-list {
  display: grid;
  gap: 8px;
}

.mini-list > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  color: #344256;
  font-size: 13px;
}

.mini-list > div span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-list .progress-line {
  min-width: 120px;
}

.practice-row {
  border-left-color: var(--blue);
}

.practice-row.correct,
.practice-row.done,
.practice-row.approved {
  border-left-color: var(--ok);
}

.practice-row.wrong,
.practice-row.pending,
.practice-row.todo {
  border-left-color: var(--danger);
}

.practice-row.learning {
  border-left-color: var(--warn);
}

.exercise-tags {
  margin-top: 8px;
}

.answer-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  align-items: start;
}

.answer-form textarea {
  min-height: 92px;
  resize: vertical;
}

.practice-head {
  align-items: center;
}

.practice-meta {
  display: inline-flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.mark-scheme {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  align-items: center;
  border-radius: var(--radius);
  padding: 10px;
  background: #f8fbfa;
  color: #344256;
  font-size: 13px;
}

.mark-scheme strong,
.mark-scheme em,
.scoring-points {
  grid-column: 1 / -1;
}

.mark-scheme span,
.mark-scheme em {
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: 999px;
  padding: 2px 8px;
  background: #fff;
  font-style: normal;
}

.mark-scheme.revealed {
  background: rgba(37, 99, 235, 0.06);
}

.scoring-points {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  border-radius: var(--radius);
  padding: 10px;
  background: rgba(37, 99, 235, 0.06);
  color: #344256;
  font-size: 13px;
  width: 100%;
}

.scoring-points span {
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 999px;
  padding: 2px 8px;
  background: #fff;
}

.result-stack {
  display: grid;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius);
  background: #fff;
}

.mab-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.mab-grid div {
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  padding: 10px;
  background: #f8fbfa;
}

.mab-grid span {
  display: block;
  color: var(--primary);
  font-size: 22px;
  font-weight: 900;
}

.point-grid {
  display: grid;
  gap: 8px;
}

.point-grid article {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  padding: 10px;
  background: #fff;
}

.point-grid article.hit {
  border-color: rgba(21, 115, 71, 0.24);
  background: rgba(21, 115, 71, 0.06);
}

.point-grid article.miss {
  border-color: rgba(180, 35, 24, 0.2);
  background: rgba(180, 35, 24, 0.05);
}

.point-grid b {
  color: var(--primary);
}

.point-grid em {
  color: var(--muted);
  font-style: normal;
  font-weight: 900;
}

.full-answer,
.mistake-alert,
.wrong-note-alert {
  border-radius: var(--radius);
  padding: 12px;
}

.full-answer {
  background: #fff;
}

.full-answer p {
  margin-bottom: 0;
}

.mistake-alert {
  border: 1px solid rgba(181, 71, 8, 0.18);
  color: #7a3413;
  background: rgba(181, 71, 8, 0.07);
}

.wrong-note-alert {
  border: 1px solid rgba(180, 35, 24, 0.22);
  color: var(--danger);
  background: rgba(180, 35, 24, 0.08);
  font-weight: 900;
}

.symbol-toolbar,
.answer-actions,
.next-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.symbol-toolbar button {
  min-height: 38px;
  min-width: 42px;
  border: 1px solid rgba(16, 32, 51, 0.12);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--primary);
  background: #fff;
  font-size: 13px;
  font-weight: 900;
}

.symbol-toolbar button:hover {
  border-color: rgba(15, 118, 110, 0.35);
  background: var(--soft);
}

.hint-box {
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.68);
}

.hint-box summary {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(16, 32, 51, 0.12);
  border-radius: var(--radius);
  padding: 8px 12px;
  color: var(--primary);
  font-weight: 900;
  cursor: pointer;
}

.hint-box summary b {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 999px;
  background: var(--soft);
  font-size: 18px;
}

.hint-box[open] summary b {
  transform: rotate(180deg);
}

.hint-box p {
  margin: 10px 0 0;
}

.feedback-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.feedback-head span {
  font-weight: 900;
}

.history-box {
  border-top: 1px solid rgba(16, 32, 51, 0.08);
  padding-top: 10px;
}

.history-box summary {
  color: var(--primary);
  font-weight: 900;
  cursor: pointer;
}

.history-box article {
  display: grid;
  gap: 4px;
  margin-top: 8px;
  border-radius: var(--radius);
  padding: 10px;
  background: rgba(255, 255, 255, 0.72);
}

.history-box article span {
  color: var(--muted);
  font-size: 12px;
}

.history-box article p {
  margin: 0;
  white-space: pre-wrap;
}

.answer-tools {
  display: grid;
  gap: 14px;
}

.tool-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 14px;
}

.answer-tools textarea {
  min-height: 150px;
  resize: vertical;
}

.formula-reference {
  display: grid;
  gap: 10px;
  align-content: start;
  border: 1px solid rgba(16, 32, 51, 0.08);
  border-radius: var(--radius);
  padding: 12px;
  background: #fff;
}

.formula-reference code {
  white-space: normal;
}

.calc-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.discussion-form,
.note-form {
  display: grid;
  gap: 10px;
}

.discussion-form textarea {
  min-height: 110px;
  resize: vertical;
}

.discussion-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.discussion-item {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.note-card,
.analysis-card {
  padding: 16px;
}

.note-card pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: #334155;
  font-family: inherit;
}

.help-center {
  display: grid;
  gap: 12px;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  padding: 16px;
  background: rgba(255, 255, 255, 0.92);
}

.help-center h3 {
  margin: 0;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.help-grid article {
  border-radius: var(--radius);
  padding: 12px;
  background: #f8fbfa;
}

.help-grid p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.filter-bar {
  padding: 12px;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  background: #fff;
}

.filter-bar select {
  width: auto;
  min-width: 150px;
}

.mock-layout {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 20px;
}

.mock-list {
  display: grid;
  align-self: start;
  gap: 10px;
}

.mock-list button {
  display: grid;
  gap: 4px;
  text-align: left;
}

.mock-list button.active {
  border-color: var(--primary);
  background: var(--soft);
}

.mock-paper {
  display: grid;
  gap: 16px;
  padding: 18px;
}

.timer {
  display: flex;
  gap: 10px;
  align-items: center;
}

.timer strong {
  font-size: 26px;
}

.mock-question {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: var(--radius);
  padding: 14px;
  background: #fbfcf8;
}

.mock-question div {
  display: flex;
  justify-content: space-between;
}

.mock-question textarea {
  min-height: 120px;
  resize: vertical;
}

.report {
  padding: 16px;
  background: var(--soft);
}

.user-row {
  display: grid;
  grid-template-columns: 76px minmax(220px, 1fr) 110px 150px minmax(260px, 320px);
  gap: 12px;
  align-items: center;
  padding: 14px;
}

.select-cell {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.select-cell input {
  width: 16px;
  height: 16px;
  padding: 0;
}

.user-main {
  display: grid;
  gap: 4px;
}

.user-main h3,
.user-main p {
  margin: 0;
}

.user-main p {
  color: var(--muted);
  font-size: 13px;
}

.footer {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto 24px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  max-width: 360px;
  border-radius: var(--radius);
  padding: 12px 14px;
  color: #fff;
  background: var(--ink);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.empty-state {
  padding: 24px;
  color: var(--muted);
}

@media (max-width: 1040px) {
  .topbar-inner,
  .hero,
  .workspace,
  .mock-layout,
  .two-col,
  .guide-panel,
  .practice-list,
  .tool-columns {
    grid-template-columns: 1fr;
  }

  .nav {
    justify-content: flex-start;
  }

  .chapter-map,
  .dashboard-band,
  .admin-band,
  .tool-grid,
  .ops-grid,
  .help-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .admin-toolbar {
    grid-template-columns: 1fr 1fr;
  }

  .side-panel {
    position: static;
  }

  .user-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .page,
  .topbar-inner,
  .footer {
    width: min(100% - 20px, 1220px);
  }

  .hero-main {
    padding: 24px 18px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .auth-panel {
    margin: 0 18px 18px;
  }

  .metric-row,
  .chapter-map,
  .dashboard-band,
  .admin-band,
  .tool-grid,
  .ops-grid,
  .lesson-grid,
  .analysis-grid,
  .answer-form,
  .practice-list,
  .mark-scheme,
  .mab-grid,
  .point-grid article,
  .tool-columns,
  .admin-toolbar,
  .help-grid {
    grid-template-columns: 1fr;
  }

  .section-title,
  .detail-title-row,
  .lesson-card header,
  .practice-head {
    align-items: stretch;
    flex-direction: column;
  }

  .filter-bar select {
    width: 100%;
  }

  .timer {
    align-items: stretch;
    flex-direction: column;
  }
}