:root {
  --primary: #176b5f;
  --secondary: #24364b;
  --accent: #d9a441;
  --ink: #14202b;
  --muted: #627080;
  --line: #d8e0e7;
  --surface: #ffffff;
  --soft: #f4f7f8;
  --danger: #b42318;
  --success: #087443;
  --warning: #a15c07;
  --shadow: 0 18px 45px rgba(21, 32, 43, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
  overflow-x: hidden;
}

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

button {
  cursor: pointer;
}

a {
  color: var(--primary);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(340px, 460px) 1fr;
  background: #eef4f2;
}

.login-panel {
  background: var(--surface);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-right: 1px solid var(--line);
}

.login-visual {
  min-height: 100vh;
  background:
    linear-gradient(125deg, rgba(20, 32, 43, 0.86), rgba(23, 107, 95, 0.76)),
    url("https://images.unsplash.com/photo-1552664730-d307ca884978?auto=format&fit=crop&w=1600&q=80");
  background-position: center;
  background-size: cover;
  color: white;
  display: flex;
  align-items: end;
  padding: 56px;
}

.login-visual h1 {
  margin: 0;
  max-width: 760px;
  font-size: 44px;
  line-height: 1.06;
  letter-spacing: 0;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 38px;
  color: var(--secondary);
  font-weight: 800;
  font-size: 22px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.login-panel h2 {
  margin: 0 0 10px;
  font-size: 30px;
  letter-spacing: 0;
}

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

.is-hidden {
  display: none !important;
}

.form-stack {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

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

.field span {
  font-size: 14px;
  font-weight: 700;
  color: #324355;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 11px 12px;
  background: white;
  color: var(--ink);
}

textarea {
  min-height: 96px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, white);
  outline-offset: 2px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.table-actions .btn {
  min-height: 34px;
  padding: 8px 10px;
}

.btn {
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  background: var(--primary);
  color: white;
  font-weight: 800;
  min-height: 42px;
}

.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: 0 0 auto;
}

.icon-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn.secondary {
  background: var(--secondary);
}

.btn.ghost {
  background: transparent;
  color: var(--secondary);
  border: 1px solid var(--line);
}

.btn.warning {
  background: var(--warning);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 270px 1fr;
}

.app-shell.sidebar-collapsed {
  grid-template-columns: 84px 1fr;
}

.sidebar {
  position: relative;
  background: #10242f;
  color: white;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: width .2s ease, padding .2s ease;
}

.sidebar .brand-mark {
  border: 0;
  background: transparent;
  padding: 0;
  width: 100%;
  margin: 0;
  color: white;
  text-align: left;
  cursor: pointer;
}

.sidebar .brand-logo {
  background: var(--accent);
  color: #18222d;
  object-fit: contain;
  flex: 0 0 auto;
}

.sidebar img.brand-logo {
  display: block;
  padding: 4px;
  background: white;
}

.sidebar-toggle {
  position: absolute;
  top: 86px;
  right: -8px;
  z-index: 55;
  width: 16px;
  height: 58px;
  min-height: 0;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 999px;
  padding: 0;
  background: rgba(16, 36, 47, 0.82);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.26);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-toggle:hover {
  background: rgba(217, 164, 65, 0.95);
}

.sidebar-toggle-pill {
  width: 3px;
  height: 31px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
}

.sidebar-toggle:hover .sidebar-toggle-pill {
  background: #18222d;
}

.sidebar.collapsed {
  align-items: center;
  padding: 18px 12px;
}

.sidebar.collapsed .brand-mark {
  justify-content: center;
}

.sidebar.collapsed .brand-text,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .sidebar-footer {
  display: none;
}

.nav {
  display: grid;
  gap: 4px;
}

.nav button {
  width: 100%;
  border: 0;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.86);
  background: transparent;
  text-align: left;
  padding: 10px 12px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.nav button.active,
.nav button:hover {
  background: rgba(255, 255, 255, 0.12);
  color: white;
}

.nav .ico {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.12);
  color: white;
}

.nav .ico .icon {
  width: 17px;
  height: 17px;
}

.sidebar-footer {
  margin-top: auto;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

.main {
  min-width: 0;
  display: grid;
  grid-template-rows: auto 1fr;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 18px 28px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  min-width: 0;
}

.topbar h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0;
}

.content {
  padding: 28px;
  display: grid;
  gap: 20px;
  align-content: start;
  min-width: 0;
}

.grid {
  display: grid;
  gap: 16px;
}

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

.grid.cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(20, 32, 43, 0.04);
  padding: 18px;
}

.card h2,
.card h3 {
  margin: 0 0 8px;
  letter-spacing: 0;
}

.metric {
  display: grid;
  gap: 4px;
}

.metric strong {
  font-size: 30px;
  letter-spacing: 0;
}

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

.status {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 800;
  background: #eaf1f0;
  color: var(--primary);
}

.status.completed {
  background: #e8f6ef;
  color: var(--success);
}

.status.overdue {
  background: #fff1f0;
  color: var(--danger);
}

.status.in_progress {
  background: #fff7e6;
  color: var(--warning);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #344658;
  font-size: 13px;
  background: #f8fafb;
}

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

tr.selected-row td {
  background: #edf7f5;
}

td input,
td select {
  min-width: 130px;
  padding: 8px 9px;
}

.toggle-line {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-width: 96px;
  font-weight: 800;
  color: #344658;
}

.toggle-line input {
  width: auto;
  margin: 0;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: #dfe8eb;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--primary);
}

.assignment-experience {
  --course-accent: #06b6d4;
  display: grid;
  gap: 18px;
}

.assignment-experience.lesson-flow {
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
}

.assignment-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 18px;
  align-items: start;
}

.learning-stage,
.quiz-card,
.progress-card {
  position: relative;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--course-accent) 36%, var(--line));
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.96), rgba(248,250,252,0.92)),
    linear-gradient(110deg, rgba(6,182,212,0.24), rgba(217,70,239,0.18), rgba(249,115,22,0.18));
  box-shadow: 0 16px 38px rgba(15, 23, 42, 0.12);
}

.learning-stage::before,
.quiz-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 0%, rgba(255,255,255,0.1) 32%, color-mix(in srgb, var(--course-accent) 32%, transparent) 50%, transparent 70%);
  transform: translateX(-65%);
  animation: scan-sweep 7s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

.learning-stage > *,
.quiz-card > * {
  position: relative;
  z-index: 1;
}

.learning-stage {
  padding: 18px;
}

.assignment-toolbar {
  justify-content: space-between;
  margin-bottom: 14px;
}

.learning-hero {
  display: grid;
  grid-template-columns: minmax(220px, 0.85fr) minmax(0, 1.15fr);
  gap: 20px;
  align-items: start;
  min-width: 0;
}

.learning-copy {
  position: relative;
  z-index: 2;
  display: grid;
  align-content: center;
  gap: 10px;
  min-width: 0;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 8px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
}

.learning-copy h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.12;
  letter-spacing: 0;
}

.learning-copy p:not(.eyebrow) {
  margin: 0;
  color: #334155;
  line-height: 1.55;
}

.lesson-media {
  position: relative;
  z-index: 1;
  min-width: 0;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  overflow: hidden;
  background: #101827;
  min-height: 0;
}

.lesson-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(6,182,212,0.22), transparent 34%, rgba(217,70,239,0.2) 62%, rgba(249,115,22,0.18)),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.12) 0 1px, transparent 1px 9px);
  mix-blend-mode: screen;
  animation: hue-flow 8s linear infinite;
}

.lesson-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transform: scale(1.02);
  animation: hero-drift 13s ease-in-out infinite alternate;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.lesson-pulse {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 14px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-left: 4px solid var(--course-accent);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  animation: pulse-in .45s ease both;
  animation-delay: var(--pulse-delay);
}

.lesson-pulse span {
  color: var(--course-accent);
  font-size: 12px;
  font-weight: 900;
}

.lesson-pulse h3 {
  margin: 0;
  font-size: 15px;
}

.lesson-pulse p {
  margin: 0;
  color: #334155;
  line-height: 1.45;
}

.lesson-card-deck {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  touch-action: pan-y;
}

.lesson-story-card {
  position: relative;
  display: grid;
  gap: 14px;
  min-height: 330px;
  padding: 24px;
  border: 1px solid color-mix(in srgb, var(--course-accent) 42%, var(--line));
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.94), rgba(255,255,255,0.82)),
    radial-gradient(circle at 12% 12%, color-mix(in srgb, var(--course-accent) 30%, transparent), transparent 34%),
    linear-gradient(110deg, rgba(6,182,212,0.16), rgba(217,70,239,0.14), rgba(249,115,22,0.12));
  box-shadow: 0 18px 42px rgba(15,23,42,0.13);
  overflow: hidden;
  animation: pulse-in .35s ease both;
}

.lesson-story-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,0.2) 45%, transparent 70%);
  animation: scan-sweep 8s ease-in-out infinite;
  pointer-events: none;
}

.lesson-count {
  width: fit-content;
  border-radius: 999px;
  padding: 6px 10px;
  background: color-mix(in srgb, var(--course-accent) 15%, white);
  color: color-mix(in srgb, var(--course-accent) 80%, #0f172a);
  font-size: 12px;
  font-weight: 900;
}

.lesson-story-card h3 {
  margin: 0;
  font-size: 27px;
  line-height: 1.16;
}

.lesson-story-card > p {
  margin: 0;
  color: #24364b;
  font-size: 17px;
  line-height: 1.58;
}

.lesson-example {
  margin-top: auto;
  border-left: 4px solid var(--course-accent);
  border-radius: 8px;
  padding: 14px 16px;
  background: rgba(255,255,255,0.84);
}

.lesson-example strong {
  display: block;
  margin-bottom: 5px;
}

.lesson-example p {
  margin: 0;
  color: #334155;
}

.lesson-dots {
  display: flex;
  justify-content: center;
  gap: 7px;
}

.lesson-dots button {
  width: 11px;
  height: 11px;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--course-accent) 25%, #cbd5e1);
  padding: 0;
}

.lesson-dots button.active {
  width: 30px;
  background: var(--course-accent);
}

.lesson-progress-card {
  position: sticky;
  top: 18px;
}

.quiz-focus-layout {
  display: block;
}

.quiz-focus-card {
  width: min(100%, 960px);
  margin: 0 auto;
}

.quiz-context {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) minmax(160px, 220px);
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid color-mix(in srgb, var(--course-accent) 30%, var(--line));
}

.quiz-context img {
  width: 76px;
  height: 54px;
  object-fit: cover;
  border-radius: 8px;
}

.quiz-context-copy {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.quiz-context-copy strong {
  color: #172033;
  font-size: 18px;
  line-height: 1.2;
}

.quiz-context-copy p,
.quiz-context-copy .eyebrow {
  margin: 0;
}

.quiz-context-copy p {
  display: none;
  color: #334155;
  font-size: 14px;
  line-height: 1.45;
}

.quiz-progress-mini {
  display: grid;
  gap: 7px;
  padding: 10px;
  border: 1px solid color-mix(in srgb, var(--course-accent) 28%, var(--line));
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
}

.quiz-progress-mini span {
  color: #172033;
  font-size: 13px;
  font-weight: 900;
}

.quiz-progress-mini small {
  color: var(--muted);
  font-weight: 700;
}

.learning-brand-badge {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid color-mix(in srgb, var(--course-accent) 30%, var(--line));
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.78);
  color: #24364b;
  font-size: 13px;
  font-weight: 900;
}

.learning-brand-badge.compact {
  margin-bottom: 7px;
}

.learning-brand-badge img {
  width: 24px;
  height: 24px;
  object-fit: contain;
  border-radius: 5px;
  background: white;
}

.quiz-card,
.progress-card {
  padding: 18px;
}

.quiz-card {
  touch-action: pan-y;
}

.question-head {
  display: grid;
  gap: 5px;
  margin-bottom: 10px;
}

.question-head h2 {
  margin: 0;
}

.question-head span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0;
}

.question {
  display: grid;
  gap: 12px;
}

.quiz-footer-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--course-accent) 24%, var(--line));
}

.quiz-footer-controls .muted {
  margin: 8px 0 0;
}

.option {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: white;
  transition: border-color .16s ease, background .16s ease, transform .16s ease, box-shadow .16s ease;
}

.option input {
  width: auto;
  margin-top: 4px;
}

.option.selected,
.option:focus-within {
  border-color: var(--primary);
  background: #edf7f5;
  transform: translateY(-1px);
}

.option.is-answer {
  border-color: rgba(22, 163, 74, 0.45);
  background: #ecfdf3;
}

.option.is-correct {
  border-color: #16a34a;
  background: #dcfce7;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}

.option.is-wrong {
  border-color: #dc2626;
  background: #fff1f2;
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
}

.answer-feedback {
  border-left: 4px solid var(--course-accent);
  border-radius: 8px;
  padding: 12px 14px;
  background: rgba(255,255,255,0.86);
  box-shadow: 0 12px 30px rgba(15,23,42,0.1);
}

.answer-feedback.correct {
  border-left-color: #16a34a;
}

.answer-feedback.wrong {
  border-left-color: #dc2626;
}

.answer-feedback.is-live {
  animation: feedback-pop .38s ease both;
}

.answer-feedback p {
  margin: 4px 0 0;
  color: #334155;
}

@keyframes scan-sweep {
  0%, 18% { transform: translateX(-72%); opacity: 0; }
  32%, 60% { opacity: 1; }
  100% { transform: translateX(72%); opacity: 0; }
}

@keyframes hue-flow {
  0% { filter: hue-rotate(0deg) saturate(1.05); }
  50% { filter: hue-rotate(45deg) saturate(1.25); }
  100% { filter: hue-rotate(0deg) saturate(1.05); }
}

@keyframes hero-drift {
  from { transform: scale(1.02) translate3d(-4px, 0, 0); }
  to { transform: scale(1.07) translate3d(6px, -4px, 0); }
}

@keyframes pulse-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes feedback-pop {
  0% { transform: scale(0.98); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.notice {
  border-left: 4px solid var(--primary);
  background: #edf7f5;
  padding: 12px 14px;
  border-radius: 6px;
}

.error {
  border-left-color: var(--danger);
  background: #fff1f0;
  color: #7a271a;
}

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

.tabs button {
  border: 1px solid var(--line);
  background: white;
  color: var(--secondary);
  border-radius: 6px;
  padding: 9px 12px;
  font-weight: 800;
}

.tabs button.active {
  background: var(--secondary);
  color: white;
  border-color: var(--secondary);
}

.split-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

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

.choice-grid .option {
  min-height: 56px;
}

.full {
  grid-column: 1 / -1;
}

.empty {
  padding: 32px;
  text-align: center;
  color: var(--muted);
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pill {
  border-radius: 999px;
  background: #edf2f7;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 800;
  color: #314256;
}

.swatches {
  display: flex;
  gap: 8px;
}

.swatch {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.12);
}

.learning-preview {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 16px 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafb;
}

.learning-preview img {
  width: 54px;
  height: 54px;
  object-fit: contain;
  border-radius: 8px;
  background: white;
  border: 1px solid var(--line);
  padding: 4px;
}

.learning-preview p {
  margin: 4px 0 0;
}

.spec-hero {
  position: relative;
  min-height: 320px;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-radius: 8px;
  background: #12242f;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.spec-hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.spec-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255,255,255,0.92), rgba(255,255,255,0.72) 36%, rgba(255,255,255,0.16) 68%),
    linear-gradient(120deg, rgba(23,107,95,0.28), transparent 48%, rgba(217,164,65,0.2));
}

.spec-hero-copy {
  position: relative;
  z-index: 1;
  max-width: 660px;
  padding: 34px;
}

.spec-hero-copy h2 {
  margin: 0 0 12px;
  font-size: 36px;
  line-height: 1.08;
  letter-spacing: 0;
}

.spec-hero-copy p:not(.eyebrow) {
  margin: 0;
  color: #334155;
  font-size: 17px;
}

.spec-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: end;
}

.spec-search {
  margin: 0;
}

.search-shell {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: 0 12px;
}

.search-shell .icon {
  color: var(--muted);
}

.search-shell input {
  border: 0;
  padding-left: 0;
}

.spec-meta {
  display: grid;
  gap: 4px;
  color: var(--muted);
  text-align: right;
}

.spec-meta strong {
  color: var(--secondary);
}

.spec-metrics .metric strong {
  color: var(--primary);
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.spec-card {
  position: relative;
  display: grid;
  gap: 14px;
  align-content: start;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,252,0.98)),
    radial-gradient(circle at top right, color-mix(in srgb, var(--accent) 18%, transparent), transparent 35%);
  box-shadow: 0 1px 2px rgba(20, 32, 43, 0.04);
}

.spec-card[hidden] {
  display: none;
}

.spec-card-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.spec-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 8px;
  background: color-mix(in srgb, var(--primary) 12%, white);
  color: var(--primary);
}

.spec-status {
  margin: 0 0 3px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0;
}

.spec-card h3 {
  margin: 0;
  font-size: 21px;
  letter-spacing: 0;
}

.spec-card > p {
  margin: 0;
  color: #334155;
}

.spec-bullets {
  margin: 0;
  padding-left: 18px;
  color: #334155;
}

.spec-bullets li + li {
  margin-top: 6px;
}

.spec-facts {
  display: grid;
  gap: 8px;
  margin: 0;
}

.spec-facts div {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.spec-facts dt {
  font-weight: 900;
  color: #334155;
}

.spec-facts dd {
  margin: 0;
  color: #475569;
}

.spec-table-wrap table {
  min-width: 760px;
}

.spec-checklist {
  display: grid;
  gap: 9px;
}

.spec-check {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.spec-check > span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  font-weight: 900;
}

.spec-check.done > span {
  background: #dcfce7;
  color: #166534;
}

.spec-check.pending > span {
  background: #fff7e6;
  color: var(--warning);
}

.spec-check p {
  margin: 3px 0 0;
  color: var(--muted);
}

.link-pill {
  color: var(--primary);
  text-decoration: none;
}

@media (max-width: 980px) {
  .login-shell,
  .assignment-experience.lesson-flow,
  .assignment-layout,
  .learning-hero,
  .spec-toolbar,
  .spec-grid,
  .grid.cols-2,
  .grid.cols-3,
  .grid.cols-4,
  .split-form {
    grid-template-columns: 1fr;
  }

  .app-shell,
  .app-shell.sidebar-collapsed {
    display: block;
    min-height: 100vh;
  }

  .login-visual {
    display: none;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 40;
    width: min(320px, 86vw);
    height: 100vh;
    overflow-y: auto;
    align-items: stretch;
    box-shadow: 18px 0 46px rgba(16, 36, 47, 0.28);
  }

  .sidebar.collapsed {
    width: 68px;
    padding: 14px 8px;
    align-items: center;
    box-shadow: 8px 0 24px rgba(16, 36, 47, 0.16);
  }

  .sidebar.collapsed .brand-text,
  .sidebar.collapsed .nav-label,
  .sidebar.collapsed .sidebar-footer {
    display: none;
  }

  .sidebar.collapsed .brand-mark {
    justify-content: center;
  }

  .sidebar.collapsed .nav button {
    justify-content: center;
    padding: 10px 8px;
  }

  .main {
    display: block;
    min-height: 100vh;
    width: calc(100% - 68px);
    margin-left: 68px;
    overflow-x: hidden;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    width: 100%;
    max-width: 100%;
  }

  .topbar .button-row {
    width: 100%;
    min-width: 0;
  }

  .topbar .button-row .btn {
    min-width: 0;
  }

  .spec-meta {
    text-align: left;
  }

  .assignment-layout {
    gap: 14px;
  }

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

  .lesson-progress-card {
    position: static;
  }

  .quiz-footer-controls {
    grid-template-columns: 1fr;
  }

  .quiz-context {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .quiz-context img {
    width: 72px;
    height: 52px;
    aspect-ratio: auto;
    max-height: none;
  }

  .quiz-progress-mini {
    grid-column: 1 / -1;
  }

  .lesson-media {
    min-height: 220px;
  }

  .spec-hero {
    min-height: 300px;
  }
}

@media (max-width: 620px) {
  .login-panel,
  .content,
  .topbar {
    padding: 20px;
  }

  .button-row {
    align-items: stretch;
  }

  .button-row .btn {
    width: 100%;
  }

  .learning-stage,
  .quiz-card,
  .progress-card {
    padding: 14px;
  }

  .learning-copy h2 {
    font-size: 23px;
  }

  .lesson-media {
    min-height: 190px;
  }

  .lesson-story-card {
    min-height: 300px;
    padding: 18px;
  }

  .lesson-story-card h3 {
    font-size: 22px;
  }

  .spec-hero-copy {
    padding: 24px;
  }

  .spec-hero::after {
    background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.82));
  }

  .spec-hero img {
    opacity: 0.58;
  }

  .spec-hero-copy h2 {
    font-size: 28px;
  }

  .spec-facts div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .option {
    min-height: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .learning-stage::before,
  .quiz-card::before,
  .lesson-media::after,
  .lesson-media img,
  .lesson-pulse,
  .lesson-story-card,
  .lesson-story-card::after,
  .answer-feedback.is-live {
    animation: none;
  }
}