:root {
  color-scheme: dark;
  --bg: #060709;
  --surface: #0f1318;
  --surface-2: #151a20;
  --surface-3: #1d232b;
  --ink: #f6f3ea;
  --muted: #a7adb8;
  --line: rgba(246, 243, 234, 0.14);
  --line-strong: rgba(246, 243, 234, 0.28);
  --cyan: #4ee7bd;
  --lime: #d7f45d;
  --coral: #ff8f5a;
  --pink: #ff4f9a;
  --blue: #5aa8ff;
  --warning: #ffd166;
  --danger: #ff6b6b;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.36);
  --radius: 8px;
  --font-ui: Inter, "Noto Sans SC", "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(135deg, rgba(78, 231, 189, 0.12), transparent 28%),
    linear-gradient(225deg, rgba(255, 79, 154, 0.12), transparent 26%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 72px),
    radial-gradient(circle at 50% 100%, rgba(255, 143, 90, 0.1), transparent 40%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  overflow: hidden;
}

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

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
}

.loading-screen,
.auth-screen {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 32px;
}

.loading-card,
.auth-frame {
  width: min(1120px, 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 19, 24, 0.88);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px);
}

.loading-card {
  width: min(420px, 100%);
  padding: 28px;
}

.brand-mark {
  display: inline-grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--cyan), var(--lime) 46%, var(--coral));
  color: #07100e;
  font-weight: 900;
}

.auth-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 430px);
  overflow: hidden;
}

.auth-hero {
  display: grid;
  align-content: space-between;
  min-height: 720px;
  padding: 52px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent),
    linear-gradient(135deg, rgba(78, 231, 189, 0.16), transparent 42%),
    #090d11;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--cyan);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.auth-title,
.page-title {
  max-width: 100%;
  margin: 0;
  font-size: clamp(3.2rem, 6.2vw, 5.8rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 0.86;
  overflow-wrap: normal;
}

.auth-title {
  font-size: clamp(3rem, 5vw, 5.1rem);
}

.auth-title span,
.page-title span {
  display: block;
  color: transparent;
  background: linear-gradient(90deg, var(--cyan), var(--lime), var(--coral), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
}

.auth-subline,
.muted {
  color: var(--muted);
}

.auth-subline {
  max-width: 620px;
  margin: 28px 0 0;
  font-size: 1.05rem;
  line-height: 1.7;
}

.auth-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 40px;
  max-width: 760px;
}

.stat-tile,
.metric,
.panel,
.unit-card,
.question-card,
.admin-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(21, 26, 32, 0.78);
}

.stat-tile {
  padding: 16px;
}

.stat-value {
  display: block;
  font-size: 1.55rem;
  font-weight: 900;
}

.stat-label {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.84rem;
}

.auth-panel {
  display: grid;
  gap: 24px;
  align-content: center;
  padding: 42px;
  background: rgba(6, 7, 9, 0.62);
}

.language-strip,
.segmented,
.toolbar,
.form-row,
.action-row,
.unit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.language-strip {
  justify-content: flex-end;
}

.chip,
.segmented button,
.ghost-button,
.primary-button,
.danger-button,
.tab-button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  font-weight: 800;
}

.chip.is-active,
.segmented button.is-active,
.tab-button.is-active {
  border-color: transparent;
  color: #06100d;
  background: linear-gradient(135deg, var(--cyan), var(--lime));
}

.primary-button {
  border-color: transparent;
  color: #06100d;
  background: linear-gradient(135deg, var(--cyan), var(--lime), var(--coral));
}

.danger-button {
  border-color: rgba(255, 107, 107, 0.52);
  color: #ffdede;
}

.ghost-button:hover,
.chip:hover,
.segmented button:hover,
.tab-button:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.08);
}

.form-stack {
  display: grid;
  gap: 14px;
}

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

.form-field label,
.form-field > span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
  outline: none;
}

.form-field textarea {
  min-height: 120px;
  padding-top: 12px;
  resize: vertical;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(78, 231, 189, 0.18);
}

.hint,
.error-line,
.success-line {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

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

.error-line {
  color: #ffb3b3;
}

.success-line {
  color: var(--cyan);
}

.studio {
  display: grid;
  grid-template-columns: minmax(320px, 360px) minmax(0, 1fr);
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
  transition: grid-template-columns 180ms ease;
}

.studio.is-sidebar-collapsed {
  grid-template-columns: 88px minmax(0, 1fr);
}

.sidebar {
  height: 100vh;
  border-right: 1px solid var(--line);
  background: rgba(8, 10, 13, 0.86);
  backdrop-filter: blur(20px);
  overflow-y: auto;
}

.sidebar-inner {
  display: grid;
  gap: 22px;
  align-content: start;
  min-height: 100%;
  padding: 22px;
}

.brand-row,
.topbar,
.profile-card,
.unit-row,
.user-row,
.objective-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand-row {
  justify-content: space-between;
}

.collapse-button {
  display: grid;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
  font-weight: 900;
}

.collapse-button:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.1);
}

.brand-title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 900;
}

.brand-meta,
.small-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.nav-stack {
  display: grid;
  gap: 10px;
}

.nav-group {
  display: grid;
  gap: 8px;
}

.unit-nav-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  gap: 6px;
  align-items: center;
}

.nav-button {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0 12px;
  color: var(--muted);
  background: transparent;
  font-weight: 800;
}

.nav-button.is-active {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
}

.unit-tree-toggle {
  display: grid;
  min-height: 44px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.045);
  font-size: 1.1rem;
  font-weight: 900;
  line-height: 1;
}

.unit-tree-toggle:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.09);
}

.nav-group.is-units-collapsed .unit-tree {
  display: none;
}

.unit-tree {
  display: grid;
  gap: 6px;
  border-left: 1px solid color-mix(in srgb, var(--grade-accent) 38%, var(--line));
  margin-left: 13px;
  padding: 2px 0 2px 12px;
}

.unit-tree-item {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  width: 100%;
  min-height: 62px;
  align-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 9px 10px;
  color: var(--ink);
  background: transparent;
  text-align: left;
}

.unit-tree-item:hover {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.045);
}

.unit-tree-item.is-active {
  border-color: color-mix(in srgb, var(--grade-accent) 72%, white);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 20%, transparent), transparent),
    rgba(255, 255, 255, 0.055);
}

.unit-tree-item.is-active::before {
  content: "";
  position: absolute;
  left: -15px;
  top: 50%;
  width: 15px;
  height: 1px;
  background: var(--grade-accent);
}

.unit-tree-index {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: #06100d;
  background: var(--grade-accent);
  font-size: 0.78rem;
  font-weight: 900;
}

.unit-tree-body {
  display: grid;
  min-width: 0;
  gap: 4px;
}

.unit-tree-title,
.unit-tree-meta {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.unit-tree-title {
  font-size: 0.88rem;
  font-weight: 900;
}

.unit-tree-meta {
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
}

.mini-bar {
  display: block;
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}

.mini-bar span {
  display: block;
  height: 100%;
  width: var(--value, 0%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--grade-accent), var(--cyan));
}

.grade-stack {
  display: grid;
  gap: 8px;
}

.grade-button {
  width: 100%;
  min-height: 62px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  text-align: left;
}

.grade-button.is-active {
  border-color: color-mix(in srgb, var(--grade-accent) 76%, white);
  background: linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 24%, transparent), rgba(255, 255, 255, 0.045));
}

.grade-button strong {
  display: block;
  font-size: 1rem;
}

.grade-button span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.profile-card {
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.avatar {
  display: grid;
  flex: 0 0 38px;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: var(--radius);
  color: #06100d;
  background: linear-gradient(135deg, var(--cyan), var(--coral));
  font-weight: 900;
}

.main {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  min-width: 0;
  height: 100vh;
  overflow: hidden;
  padding: 24px;
}

.is-sidebar-collapsed .sidebar-inner {
  gap: 14px;
  padding: 18px 12px;
}

.is-sidebar-collapsed .brand-row,
.is-sidebar-collapsed .profile-card {
  justify-content: center;
}

.is-sidebar-collapsed .brand-row > div,
.is-sidebar-collapsed .profile-card > div,
.is-sidebar-collapsed .nav-button span,
.is-sidebar-collapsed .small-label,
.is-sidebar-collapsed .unit-tree-body,
.is-sidebar-collapsed .grade-button strong,
.is-sidebar-collapsed .grade-button span,
.is-sidebar-collapsed .sidebar-inner > .ghost-button {
  display: none;
}

.is-sidebar-collapsed .brand-row {
  display: grid;
  gap: 8px;
}

.is-sidebar-collapsed .collapse-button {
  width: 42px;
  height: 34px;
}

.is-sidebar-collapsed .profile-card {
  padding: 8px;
}

.is-sidebar-collapsed .nav-button {
  justify-content: center;
  padding: 0;
}

.is-sidebar-collapsed .nav-button strong {
  font-size: 0.84rem;
}

.is-sidebar-collapsed .unit-tree {
  justify-items: center;
  border-left: 0;
  margin-left: 0;
  padding: 0;
}

.is-sidebar-collapsed .unit-nav-row {
  grid-template-columns: 1fr;
}

.is-sidebar-collapsed .unit-tree-toggle {
  display: none;
}

.is-sidebar-collapsed .unit-tree-item {
  grid-template-columns: 1fr;
  width: 42px;
  min-height: 42px;
  justify-items: center;
  padding: 6px;
}

.is-sidebar-collapsed .unit-tree-item.is-active::before {
  left: -8px;
  width: 4px;
  height: 22px;
  transform: translateY(-50%);
}

.is-sidebar-collapsed .unit-tree-index {
  width: 30px;
  height: 30px;
}

.is-sidebar-collapsed .grade-button {
  display: grid;
  min-height: 42px;
  place-items: center;
  padding: 0;
  text-align: center;
}

.is-sidebar-collapsed .grade-button::after {
  content: attr(data-short);
  color: var(--ink);
  font-weight: 900;
}

.topbar {
  justify-content: space-between;
  margin-bottom: 0;
}

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

.content-frame {
  width: min(100%, 1320px);
  min-height: 0;
  height: 100%;
  overflow: auto;
  overscroll-behavior: contain;
  padding: 0 4px 28px 0;
  scrollbar-gutter: stable both-edges;
}

.content-frame > .hero-panel,
.content-frame > .workspace {
  min-width: min(1120px, 100%);
}

.hero-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.08), transparent 48%),
    linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 30%, transparent), transparent 54%),
    rgba(15, 19, 24, 0.84);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.88fr);
  gap: 14px;
  align-items: center;
}

.hero-copy {
  max-width: 880px;
}

.hero-panel .eyebrow {
  margin-bottom: 8px;
}

.hero-panel .page-title {
  font-size: clamp(1.65rem, 2.5vw, 2.45rem);
  line-height: 0.98;
}

.book-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 10px;
  color: var(--muted);
  background: rgba(0, 0, 0, 0.22);
  font-size: 0.8rem;
  font-weight: 800;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
  gap: 8px;
  margin-top: 8px;
}

.metric {
  min-width: 0;
  padding: 10px;
}

.metric strong {
  display: block;
  max-width: 100%;
  font-size: clamp(1.05rem, 1.45vw, 1.45rem);
  line-height: 1;
  overflow-wrap: normal;
  white-space: nowrap;
}

.metric.metric-text strong {
  font-size: clamp(0.88rem, 1vw, 1.05rem);
  line-height: 1.12;
  overflow-wrap: anywhere;
  white-space: normal;
}

.metric span {
  display: block;
  max-width: 100%;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 12px;
}

.workspace-main {
  width: min(1240px, 100%);
}

.panel {
  min-width: 0;
  padding: 18px;
}

.panel-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.panel-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 900;
}

.unit-list {
  display: grid;
  gap: 10px;
}

.unit-card {
  width: 100%;
  padding: 14px;
  color: var(--ink);
  text-align: left;
}

.unit-card.is-active {
  border-color: color-mix(in srgb, var(--grade-accent) 74%, white);
  background: linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 18%, transparent), rgba(255, 255, 255, 0.055));
}

.unit-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1rem;
}

.unit-row {
  justify-content: space-between;
}

.pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 8px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pill.secure {
  border-color: rgba(78, 231, 189, 0.42);
  color: var(--cyan);
}

.pill.review {
  border-color: rgba(255, 209, 102, 0.48);
  color: var(--warning);
}

.unit-detail-title {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 4.6rem);
  font-weight: 900;
  line-height: 0.92;
}

.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.8fr);
  gap: 16px;
  margin-top: 20px;
}

.objective-list,
.question-list,
.review-list,
.admin-list {
  display: grid;
  gap: 10px;
}

.objective-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
}

.objective-scroll {
  height: clamp(260px, 34vh, 380px);
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 6px;
  scrollbar-gutter: stable;
}

.objective-row {
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(255, 255, 255, 0.035);
}

.objective-index {
  display: grid;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: var(--radius);
  color: #06100d;
  background: var(--grade-accent);
  font-size: 0.78rem;
  font-weight: 900;
}

.question-card {
  padding: 14px;
}

.question-card p {
  margin: 8px 0 0;
  color: var(--ink);
  line-height: 1.55;
}

.diagnostic-review-grid {
  align-items: stretch;
}

.diagnostic-review-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
}

.diagnostic-review-panel .panel-title {
  margin-bottom: 8px;
}

.diagnostic-review-scroll {
  height: clamp(210px, 24vh, 260px);
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 6px;
  scrollbar-gutter: stable;
}

.diagnostic-review-scroll .question-card {
  padding: 12px;
}

.diagnostic-review-scroll .question-card p {
  font-size: 0.96rem;
  line-height: 1.45;
}

.practice-panel {
  margin-top: 16px;
}

.teacher-guide {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.teacher-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.65fr);
  gap: 12px;
}

.teacher-card,
.teacher-prompt {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 10%, transparent), transparent 55%),
    rgba(255, 255, 255, 0.035);
}

.teacher-card p,
.teacher-prompt p {
  margin: 10px 0 0;
  color: var(--ink);
  line-height: 1.55;
}

.teacher-prompts {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  height: clamp(240px, 30vh, 360px);
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 6px;
  scrollbar-gutter: stable;
}

.teacher-prompt {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.teacher-prompt details {
  margin-top: 10px;
  color: var(--muted);
}

.teacher-prompt summary {
  cursor: pointer;
  color: var(--cyan);
  font-weight: 800;
}

.practice-card {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 8%, transparent), transparent),
    rgba(21, 26, 32, 0.78);
}

.practice-card.has-correct-feedback {
  border-color: color-mix(in srgb, var(--grade-accent) 48%, rgba(78, 231, 189, 0.42));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--grade-accent) 18%, transparent), 0 18px 44px rgba(0, 0, 0, 0.22);
}

.practice-card.has-wrong-feedback {
  border-color: rgba(255, 111, 145, 0.36);
}

.practice-controls {
  display: grid;
  gap: 14px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: rgba(255, 255, 255, 0.035);
}

.practice-controls h5 {
  margin: 0 0 6px;
  color: var(--ink);
  font-size: 1rem;
}

.control-grid {
  display: grid;
  grid-template-columns: 160px 120px minmax(240px, 1fr);
  gap: 12px;
  align-items: end;
}

.type-toggle-row,
.practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.type-toggle {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: none;
}

.type-toggle input {
  width: auto;
  min-height: auto;
  margin: 0;
  accent-color: var(--grade-accent);
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.answer-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-top: 12px;
}

.answer-row input {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}

.answer-reveal {
  margin-top: 12px;
}

.answer-reveal-button {
  min-height: 38px;
  padding-inline: 12px;
  font-size: 0.82rem;
}

.answer-panel {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  border: 1px solid color-mix(in srgb, var(--grade-accent) 32%, var(--line));
  border-radius: var(--radius);
  padding: 12px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 12%, transparent), transparent 62%),
    rgba(255, 255, 255, 0.04);
}

.answer-panel p {
  margin: 6px 0 0;
  color: var(--ink);
  line-height: 1.55;
}

.answer-panel-copy {
  display: grid;
  gap: 8px;
  margin-top: 6px;
}

.answer-panel-copy p {
  margin: 0;
}

.feedback {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
}

.feedback.is-correct {
  border-color: rgba(78, 231, 189, 0.42);
  background:
    radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--grade-accent) 26%, transparent), transparent 34%),
    rgba(78, 231, 189, 0.08);
}

.feedback.is-wrong {
  border-color: rgba(255, 111, 145, 0.46);
  background:
    radial-gradient(circle at 18% 20%, rgba(255, 111, 145, 0.18), transparent 36%),
    rgba(255, 255, 255, 0.04);
}

.feedback strong {
  display: block;
  color: var(--cyan);
}

.feedback p {
  margin-top: 4px;
  color: var(--muted);
}

.feedback.is-wrong strong {
  color: #ff9db5;
}

.feedback-face {
  display: grid;
  flex: 0 0 52px;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 1px solid rgba(255, 111, 145, 0.34);
  border-radius: 50%;
  background: rgba(255, 111, 145, 0.1);
  font-size: 1.8rem;
  animation: face-wobble 0.82s ease both;
}

.celebration-effect {
  position: relative;
  display: grid;
  flex: 0 0 92px;
  width: 92px;
  height: 64px;
  place-items: center;
}

.spark-ring {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.spark-ring span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--grade-accent) 76%, #ffffff);
  box-shadow: 0 0 18px color-mix(in srgb, var(--grade-accent) 70%, transparent);
  opacity: 0;
  transform: rotate(calc(var(--spark) * 25.714deg)) translateY(0) scale(0.38);
  animation: firework-spark 900ms var(--delay) cubic-bezier(0.16, 1, 0.3, 1) both;
}

.spark-ring span:nth-child(3n) {
  background: #ffd166;
}

.spark-ring span:nth-child(4n) {
  background: #4ee7bd;
}

.spark-ring span:nth-child(5n) {
  background: #ff8f3d;
}

.clap-line {
  position: relative;
  z-index: 1;
  display: inline-flex;
  gap: 2px;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  min-height: 44px;
  border: 1px solid color-mix(in srgb, var(--grade-accent) 38%, transparent);
  border-radius: var(--radius);
  background: rgba(6, 16, 18, 0.72);
  box-shadow: inset 0 0 24px color-mix(in srgb, var(--grade-accent) 14%, transparent);
}

.clap-line b {
  display: inline-block;
  font-size: 1.28rem;
  line-height: 1;
  transform-origin: bottom center;
  animation: clap-pop 780ms ease both;
}

.clap-line b:nth-child(2) {
  animation-delay: 0.09s;
}

.clap-line b:nth-child(3) {
  animation-delay: 0.18s;
}

@keyframes firework-spark {
  0% {
    opacity: 0;
    transform: rotate(calc(var(--spark) * 25.714deg)) translateY(0) scale(0.38);
  }

  18% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: rotate(calc(var(--spark) * 25.714deg)) translateY(-34px) scale(1.05);
  }
}

@keyframes clap-pop {
  0% {
    opacity: 0;
    transform: translateY(8px) rotate(-10deg) scale(0.72);
  }

  36% {
    opacity: 1;
    transform: translateY(-4px) rotate(8deg) scale(1.18);
  }

  68% {
    transform: translateY(1px) rotate(-4deg) scale(0.96);
  }

  100% {
    opacity: 1;
    transform: translateY(0) rotate(0deg) scale(1);
  }
}

@keyframes face-wobble {
  0% {
    opacity: 0;
    transform: translateY(6px) rotate(0deg) scale(0.9);
  }

  35% {
    opacity: 1;
    transform: translateY(0) rotate(-5deg) scale(1.05);
  }

  62% {
    transform: rotate(4deg) scale(0.98);
  }

  100% {
    opacity: 1;
    transform: rotate(0deg) scale(1);
  }
}

.bar {
  height: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
}

.bar span {
  display: block;
  height: 100%;
  width: var(--value, 0%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--grade-accent), var(--lime));
}

.exam-workspace {
  width: min(1240px, 100%);
}

.exam-builder-panel {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--grade-accent) 16%, transparent), transparent 52%),
    rgba(21, 26, 32, 0.82);
}

.exam-config-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(150px, 1fr));
  gap: 12px;
  align-items: end;
  margin-top: 14px;
}

.exam-config-wide {
  grid-template-columns: minmax(240px, 0.55fr) minmax(360px, 1.45fr);
  align-items: start;
}

.unit-picker {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 8px;
  max-height: 260px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px;
  background: rgba(255, 255, 255, 0.035);
}

.unit-picker-all {
  grid-column: 1 / -1;
  border-color: color-mix(in srgb, var(--grade-accent) 48%, var(--line));
}

.unit-picker-item {
  justify-content: flex-start;
}

.exam-paper-panel {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 44%),
    rgba(15, 19, 24, 0.86);
}

.exam-submit-row {
  justify-content: flex-end;
  margin-top: 14px;
}

.exam-sheet {
  display: grid;
  gap: 14px;
  border: 1px solid rgba(17, 24, 39, 0.16);
  border-radius: var(--radius);
  padding: clamp(16px, 2vw, 26px);
  color: #171717;
  background: #fbf8ef;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.66);
}

.exam-sheet .pill {
  border-color: rgba(17, 24, 39, 0.16);
  color: #1b1b1b;
  background: rgba(17, 24, 39, 0.05);
}

.exam-sheet-head {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(140px, 0.58fr) minmax(130px, 0.45fr);
  gap: 12px;
  border-bottom: 2px solid rgba(17, 24, 39, 0.18);
  padding-bottom: 14px;
  font-weight: 800;
}

.exam-question {
  display: grid;
  gap: 10px;
  border: 1px solid rgba(17, 24, 39, 0.12);
  border-radius: var(--radius);
  padding: 14px;
  background: rgba(255, 255, 255, 0.72);
}

.exam-question.is-correct {
  border-color: rgba(32, 141, 101, 0.42);
  background: linear-gradient(135deg, rgba(78, 231, 189, 0.12), rgba(255, 255, 255, 0.82));
}

.exam-question.is-wrong {
  border-color: rgba(214, 85, 85, 0.38);
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(255, 255, 255, 0.82));
}

.exam-question p {
  margin: 0;
  line-height: 1.58;
}

.exam-choice-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 0;
}

.exam-choice {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(17, 24, 39, 0.14);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.7);
  font-weight: 700;
}

.exam-choice input {
  accent-color: var(--grade-accent);
}

.exam-answer-input {
  width: 100%;
  min-height: 46px;
  border: 1px solid rgba(17, 24, 39, 0.18);
  border-radius: var(--radius);
  padding: 10px 12px;
  color: #171717;
  background: rgba(255, 255, 255, 0.86);
  outline: none;
}

textarea.exam-answer-input {
  min-height: 118px;
  resize: vertical;
}

.offline-answer-space {
  min-height: 88px;
  border: 1px dashed rgba(17, 24, 39, 0.34);
  border-radius: var(--radius);
  padding: 10px;
  color: rgba(17, 24, 39, 0.5);
  background:
    repeating-linear-gradient(0deg, transparent 0 27px, rgba(17, 24, 39, 0.14) 28px 29px),
    rgba(255, 255, 255, 0.52);
  font-size: 0.8rem;
  font-weight: 900;
  text-transform: uppercase;
}

.offline-answer-space.is-tall {
  min-height: 150px;
}

.exam-question-result {
  border-top: 1px solid rgba(17, 24, 39, 0.13);
  padding-top: 10px;
}

.exam-question-result strong {
  display: block;
  margin-bottom: 6px;
}

.exam-report-panel {
  border-color: color-mix(in srgb, var(--grade-accent) 38%, var(--line));
}

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

.exam-insight-grid {
  margin-top: 12px;
}

.breakdown-row {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  background: rgba(255, 255, 255, 0.035);
}

.admin-panel {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.62);
}

.admin-dialog {
  width: min(1040px, 100%);
  height: min(760px, calc(100vh - 48px));
  max-height: calc(100vh - 48px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0b0f13;
  box-shadow: var(--shadow);
}

.admin-dialog-inner {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
  height: 100%;
  min-height: 0;
  padding: 22px;
}

.admin-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 16px;
  min-height: 0;
}

.admin-card {
  min-height: 0;
  padding: 16px;
}

.admin-grid > .admin-card {
  height: 100%;
}

.admin-grid > .form-stack {
  align-content: start;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 12px;
  scrollbar-gutter: stable;
}

.admin-grid > .admin-card:not(.form-stack) {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
}

.admin-card .admin-list {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 6px;
  scrollbar-gutter: stable;
}

.user-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(255, 255, 255, 0.035);
}

.admin-user-actions {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: 1fr;
  gap: 8px;
  width: 100%;
  margin-top: 10px;
}

.admin-user-actions input {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}

.danger-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.mobile-grade-bar {
  display: none;
}

@media (max-width: 1080px) {
  .auth-frame,
  .studio,
  .workspace,
  .hero-grid,
  .detail-grid,
  .admin-grid,
  .exam-config-grid,
  .exam-config-wide,
  .exam-report-grid,
  .exam-insight-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    max-height: 46vh;
  }

  .main {
    height: auto;
    overflow: visible;
    padding: 16px;
  }

  .content-frame {
    width: 100%;
    height: auto;
    overflow: visible;
    padding: 0 0 16px;
    scrollbar-gutter: auto;
  }

  .content-frame > .hero-panel,
  .content-frame > .workspace {
    min-width: 0;
  }

  body {
    overflow: auto;
  }

  .studio {
    height: auto;
    overflow: visible;
  }

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

@media (max-width: 720px) {
  .auth-screen,
  .loading-screen {
    padding: 12px;
  }

  .admin-panel {
    padding: 12px;
  }

  .admin-dialog {
    height: calc(100dvh - 24px);
    max-height: calc(100dvh - 24px);
  }

  .admin-dialog-inner {
    padding: 14px;
  }

  .auth-hero,
  .auth-panel {
    min-height: auto;
    padding: 24px;
  }

  .auth-stats,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .auth-title {
    font-size: clamp(2.9rem, 14vw, 4.1rem);
  }

  .page-title {
    font-size: clamp(2.55rem, 12vw, 3.15rem);
  }

  .topbar,
  .panel-head {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar-actions,
  .language-strip,
  .toolbar,
  .action-row,
  .unit-actions {
    justify-content: flex-start;
  }

  .teacher-grid,
  .control-grid,
  .exam-sheet-head {
    grid-template-columns: 1fr;
  }

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