:root {
  --purple-950: #493f50;
  --purple-800: #65596d;
  --purple-700: #796b81;
  --purple-500: #9b8da2;
  --purple-300: #c2b6c5;
  --purple-200: #d9d0db;
  --purple-100: #ebe5ec;
  --purple-050: #f6f2f6;
  --white: #ffffff;
  --ink: #332f35;
  --muted: #756f78;
  --line: #ddd6df;
  --sage: #9eaa99;
  --sage-soft: #e5ebe2;
  --peach: #c99f96;
  --peach-soft: #f4e5e1;
  --amber: #b18c57;
  --amber-soft: #f4ead8;
  --shadow: 0 14px 40px rgba(73, 63, 80, 0.1);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 12px;
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  color: var(--ink);
  background: var(--purple-050);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

html {
  min-height: 100%;
  background: var(--purple-050);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 12%, rgba(194, 182, 197, 0.42) 0 88px, transparent 90px),
    radial-gradient(circle at 92% 88%, rgba(158, 170, 153, 0.23) 0 120px, transparent 122px),
    linear-gradient(145deg, var(--purple-050), var(--white) 55%, #f1edf2);
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: var(--purple-800);
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(221, 214, 223, 0.8);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.topbar-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--purple-950);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 13px 13px 17px 13px;
  color: var(--white);
  background: var(--purple-800);
  box-shadow: 0 8px 18px rgba(101, 89, 109, 0.2);
}

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

.main {
  padding: 34px 0 70px;
}

.auth-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.auth-layout {
  width: min(960px, 100%);
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.auth-hero {
  position: relative;
  min-height: 580px;
  padding: 54px;
  overflow: hidden;
  color: var(--white);
  background:
    radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.2) 0 72px, transparent 74px),
    linear-gradient(155deg, var(--purple-950), var(--purple-700));
}

.auth-hero::after {
  content: "";
  position: absolute;
  right: -52px;
  bottom: -70px;
  width: 230px;
  height: 230px;
  border: 28px solid rgba(255, 255, 255, 0.09);
  border-radius: 50%;
}

.auth-hero h1 {
  max-width: 460px;
  margin: 70px 0 20px;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.auth-hero p {
  max-width: 430px;
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 17px;
  line-height: 1.8;
}

.tiny-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 13px;
}

.auth-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 52px;
}

.auth-panel h2 {
  margin: 0 0 10px;
  font-size: 30px;
}

.auth-panel > p {
  margin: 0 0 30px;
  color: var(--muted);
  line-height: 1.7;
}

.form-grid {
  display: grid;
  gap: 18px;
}

.field {
  display: grid;
  gap: 8px;
}

.field label {
  color: var(--purple-950);
  font-size: 14px;
  font-weight: 700;
}

.input,
.textarea,
.select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  outline: none;
  color: var(--ink);
  background: var(--white);
  transition:
    border 0.18s ease,
    box-shadow 0.18s ease;
}

.input,
.select {
  min-height: 46px;
  padding: 0 14px;
}

.textarea {
  min-height: 132px;
  padding: 13px 14px;
  resize: vertical;
  line-height: 1.65;
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--purple-500);
  box-shadow: 0 0 0 4px rgba(155, 141, 162, 0.14);
}

.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 17px;
  border: 1px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 750;
  text-decoration: none;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    background 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.button-primary {
  color: var(--white);
  background: var(--purple-800);
  box-shadow: 0 8px 18px rgba(101, 89, 109, 0.18);
}

.button-primary:hover {
  background: var(--purple-950);
}

.button-soft {
  color: var(--purple-950);
  border-color: var(--purple-200);
  background: var(--purple-100);
}

.button-plain {
  color: var(--purple-800);
  border-color: var(--line);
  background: var(--white);
}

.button-danger {
  color: #815047;
  border-color: #e4c9c3;
  background: var(--peach-soft);
}

.button-small {
  min-height: 34px;
  padding: 0 12px;
  font-size: 13px;
}

.button-wide {
  width: 100%;
}

.helper {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.auth-links {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 22px;
  font-size: 14px;
}

.notice {
  padding: 13px 15px;
  border: 1px solid var(--purple-200);
  border-radius: var(--radius-md);
  color: var(--purple-950);
  background: var(--purple-050);
  line-height: 1.6;
}

.notice-error {
  border-color: #e4c9c3;
  color: #75483f;
  background: var(--peach-soft);
}

.notice-success {
  border-color: #cbd6c6;
  color: #54634f;
  background: var(--sage-soft);
}

.hidden {
  display: none !important;
}

.page-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--purple-700);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-heading h1 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  letter-spacing: -0.04em;
}

.page-heading p {
  max-width: 680px;
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 24px rgba(73, 63, 80, 0.06);
}

.card-pad {
  padding: 22px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 26px;
}

.summary-card {
  min-height: 126px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
}

.summary-card strong {
  display: block;
  margin-top: 12px;
  color: var(--purple-950);
  font-size: 30px;
}

.summary-card span {
  color: var(--muted);
  font-size: 14px;
}

.search-panel {
  display: grid;
  grid-template-columns: minmax(180px, 0.65fr) minmax(260px, 1.35fr);
  align-items: center;
  gap: 22px;
  margin-bottom: 22px;
}

.search-panel-copy h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

.search-panel-copy p,
.empty-search p {
  margin: 0;
  color: var(--muted);
}

.search-control {
  display: grid;
  gap: 7px;
}

.teacher-search-panel {
  margin-bottom: 20px;
}

.teacher-search-panel .search-results {
  grid-column: 1 / -1;
}

.search-results {
  display: grid;
  gap: 10px;
  padding-top: 4px;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--purple-050);
}

.search-result-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.search-result-item p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.data-table tr.search-hit td {
  background: var(--amber-soft);
  transition: background 0.25s ease;
}

.exercise-card-top {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.empty-search {
  grid-column: 1 / -1;
  text-align: center;
}

.empty-search strong {
  display: block;
  margin-bottom: 8px;
  color: var(--purple-950);
  font-size: 18px;
}

.exercise-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.exercise-card {
  position: relative;
  min-height: 220px;
  padding: 24px;
  overflow: hidden;
}

.exercise-card::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -36px;
  width: 120px;
  height: 120px;
  border-radius: 42% 58% 53% 47%;
  background: var(--purple-100);
  transform: rotate(18deg);
}

.exercise-card h2 {
  position: relative;
  z-index: 1;
  margin: 16px 0 8px;
  font-size: 23px;
}

.exercise-card p {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.exercise-meta {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  color: var(--purple-950);
  background: var(--purple-100);
  font-size: 12px;
  font-weight: 750;
}

.chip-success {
  color: #51604d;
  background: var(--sage-soft);
}

.chip-warning {
  color: #775d39;
  background: var(--amber-soft);
}

.chip-error {
  color: #75483f;
  background: var(--peach-soft);
}

.practice-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 24px;
}

.practice-sidebar {
  position: sticky;
  top: 92px;
  align-self: start;
  padding: 18px;
}

.practice-sidebar h3 {
  margin: 0 0 14px;
}

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

.filter-button {
  width: 100%;
  justify-content: flex-start;
}

.filter-button.active {
  color: var(--white);
  background: var(--purple-800);
}

.progress {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--purple-100);
}

.progress > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--purple-700);
}

.question-list {
  display: grid;
  gap: 18px;
}

.question-card {
  overflow: hidden;
}

.question-card-incomplete {
  border-color: #d92d20;
  box-shadow: 0 0 0 2px rgba(217, 45, 32, 0.14), var(--shadow);
}

.question-card-incomplete .question-head {
  border-bottom-color: #e3a39a;
  background: #fff1f0;
}

.question-card-incomplete .question-number > strong,
.question-card-incomplete .points {
  color: #b42318;
}

.question-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--purple-050);
}

.question-score-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.incomplete-score-badge {
  color: #9f1c14;
  background: #ffd9d5;
}

.incomplete-score-badge[hidden] {
  display: none;
}

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

.question-number strong {
  font-size: 17px;
}

.points {
  color: var(--purple-700);
  font-size: 13px;
  font-weight: 750;
}

.question-body {
  padding: 22px;
}

.markdown {
  overflow-wrap: anywhere;
  color: var(--ink);
  line-height: 1.75;
}

.markdown > :first-child {
  margin-top: 0;
}

.markdown > :last-child {
  margin-bottom: 0;
}

.markdown table {
  width: 100%;
  margin: 14px 0;
  border-collapse: collapse;
  font-size: 14px;
}

.markdown th,
.markdown td {
  padding: 9px 10px;
  border: 1px solid var(--line);
  text-align: left;
}

.markdown th {
  background: var(--purple-050);
}

.markdown code {
  padding: 2px 5px;
  border-radius: 6px;
  color: var(--purple-950);
  background: var(--purple-100);
}

.markdown hr {
  height: 1px;
  margin: 18px 0;
  border: 0;
  background: var(--line);
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 0;
}

.options {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.option {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  background: var(--white);
}

.option:has(input:checked) {
  border-color: var(--purple-500);
  background: var(--purple-050);
  box-shadow: 0 0 0 3px rgba(155, 141, 162, 0.1);
}

.option input {
  margin-top: 5px;
  accent-color: var(--purple-800);
}

.answer-area {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.inline-blank-input {
  display: inline-block;
  width: clamp(7.5rem, 18vw, 13rem);
  min-height: 38px;
  margin: 3px 5px;
  padding: 6px 10px;
  border: 1px solid var(--purple-300);
  border-radius: 9px;
  outline: none;
  color: var(--ink);
  background: var(--white);
  font: inherit;
  line-height: 1.25;
  vertical-align: middle;
}

.inline-blank-input:focus {
  border-color: var(--purple-700);
  box-shadow: 0 0 0 3px rgba(101, 89, 109, 0.12);
}

.inline-blank-input:disabled {
  color: var(--muted);
  background: var(--purple-050);
}

.inline-blank-help {
  margin-top: 12px;
}

.numeric-rules {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.numeric-input-row {
  display: grid;
  grid-template-columns: minmax(160px, 300px) auto;
  align-items: center;
  gap: 12px;
}

.numeric-input-row strong {
  color: var(--purple-800);
}

.numeric-answer code {
  padding: 2px 5px;
  border-radius: 6px;
  color: var(--purple-950);
  background: var(--purple-100);
}

.question-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}

.question-actions > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.save-state {
  color: var(--muted);
  font-size: 13px;
}

.result-box {
  display: grid;
  gap: 12px;
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.result-correct {
  border-color: #cad6c5;
  background: var(--sage-soft);
}

.result-wrong {
  border-color: #e3c8c2;
  background: var(--peach-soft);
}

.answer-key {
  padding-top: 12px;
  border-top: 1px dashed currentColor;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tab-button.active {
  color: var(--white);
  background: var(--purple-800);
}

.section-stack {
  display: grid;
  gap: 20px;
}

.section-stack > * {
  min-width: 0;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0 0 6px;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 16px;
}

.toolbar .field {
  min-width: 220px;
  flex: 1;
}

.student-search-toolbar {
  align-items: center;
}

.lesson-balance {
  display: grid;
  gap: 3px;
  min-width: 92px;
}

.lesson-value {
  color: var(--purple-950);
  font-size: 20px;
  line-height: 1.2;
}

.lesson-project {
  color: var(--purple-800);
  font-size: 16px;
}

.lesson-unset {
  color: var(--muted);
  font-size: 15px;
}

.lesson-warning,
.summary-card strong.lesson-warning {
  color: #b42318;
}

.summary-card small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.modal-backdrop {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(51, 47, 53, 0.55);
}

.lesson-dialog {
  width: min(520px, 100%);
  max-height: calc(100vh - 40px);
  padding: 24px;
  overflow-y: auto;
  box-shadow: 0 24px 70px rgba(51, 47, 53, 0.28);
}

.lesson-dialog form {
  display: grid;
  gap: 16px;
}

.lesson-dialog .section-heading {
  margin-bottom: 0;
}

.lesson-default-option {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--purple-950);
  font-size: 14px;
  line-height: 1.5;
}

.lesson-default-option input {
  width: 18px;
  height: 18px;
  margin-top: 1px;
  accent-color: var(--purple-800);
}

.lesson-preview {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.lesson-preview span {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--purple-050);
}

.lesson-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding-top: 4px;
}

.assignment-editor {
  scroll-margin-top: 20px;
}

.assignment-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  max-height: 520px;
  padding: 2px;
  overflow-y: auto;
}

.assignment-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
  cursor: pointer;
}

.assignment-option.selected {
  border-color: var(--purple-500);
  background: var(--purple-050);
}

.assignment-option input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--purple-800);
}

.assignment-option span {
  display: grid;
  min-width: 0;
  gap: 4px;
}

.assignment-option strong {
  line-height: 1.45;
}

.assignment-option small {
  color: var(--muted);
  line-height: 1.45;
}

.assignment-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 18px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 12px 13px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  white-space: nowrap;
  color: var(--purple-950);
  background: var(--purple-050);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}

.pagination:empty {
  display: none;
}

.pagination-pages {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.pagination-ellipsis {
  min-width: 24px;
  color: var(--muted);
  text-align: center;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.pagination-jump {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.pagination-input {
  width: 64px;
  min-height: 34px;
  padding: 5px 8px;
  text-align: center;
}

.pagination-status {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.pagination .button[aria-current="page"] {
  pointer-events: none;
}

.review-list {
  display: grid;
  gap: 16px;
}

.review-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--white);
}

.review-item-incomplete {
  border-color: #d92d20;
  background: #fff8f7;
  box-shadow: 0 0 0 2px rgba(217, 45, 32, 0.12);
}

.review-item-incomplete .question-number > strong,
.review-item-incomplete .points {
  color: #b42318;
}

.student-answer,
.official-answer {
  margin-top: 14px;
  padding: 14px;
  border-radius: 12px;
}

.student-answer {
  background: var(--purple-050);
}

.official-answer {
  background: var(--sage-soft);
}

.unanswered-label {
  color: var(--muted);
  font-weight: 750;
}

.unanswered-review {
  align-content: center;
  color: var(--muted);
}

.unanswered-review p {
  margin: 0;
  line-height: 1.6;
}

.review-controls {
  display: grid;
  align-content: start;
  gap: 12px;
}

.score-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
}

.score-row .input {
  min-width: 0;
}

.empty-state {
  padding: 42px 22px;
  text-align: center;
  color: var(--muted);
}

.toast-stack {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 100;
  display: grid;
  gap: 10px;
}

.toast {
  min-width: min(360px, calc(100vw - 36px));
  max-width: 420px;
  padding: 13px 16px;
  border: 1px solid var(--purple-200);
  border-radius: 13px;
  color: var(--purple-950);
  background: var(--white);
  box-shadow: var(--shadow);
  animation: toast-in 0.2s ease;
}

.toast.error {
  border-color: #e3c8c2;
  background: var(--peach-soft);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

@media (max-width: 880px) {
  .auth-layout,
  .practice-layout,
  .review-item {
    grid-template-columns: 1fr;
  }

  .auth-hero {
    min-height: auto;
    padding: 36px;
  }

  .auth-hero h1 {
    margin-top: 34px;
  }

  .auth-panel {
    padding: 36px;
  }

  .practice-sidebar {
    position: static;
  }

  .filter-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .shell {
    width: min(100% - 22px, 1180px);
  }

  .topbar-inner,
  .page-heading,
  .section-heading {
    align-items: flex-start;
  }

  .topbar-inner {
    min-height: 62px;
  }

  .top-actions .user-label {
    display: none;
  }

  .page-heading,
  .section-heading {
    flex-direction: column;
  }

  .summary-grid,
  .exercise-grid,
  .assignment-grid,
  .split-grid,
  .search-panel {
    grid-template-columns: 1fr;
  }

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

  .search-result-item {
    align-items: flex-start;
    flex-direction: column;
  }

  .auth-page {
    padding: 12px;
  }

  .auth-layout {
    border-radius: 22px;
  }

  .auth-hero,
  .auth-panel {
    padding: 28px 24px;
  }

  .auth-hero h1 {
    font-size: 38px;
  }

  .main {
    padding-top: 24px;
  }

  .question-head,
  .question-body,
  .card-pad {
    padding: 17px;
  }

  .filter-list {
    grid-template-columns: 1fr;
  }

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

  .lesson-preview {
    grid-template-columns: 1fr;
  }

  .lesson-dialog {
    padding: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}