:root {
  --green: #176c2e;
  --green-dark: #0f4d22;
  --lime: #77b82a;
  --ink: #193326;
  --muted: #66746b;
  --line: #d9e4dc;
  --soft: #f5f8f4;
  --white: #ffffff;
  --warning: #a76110;
  --danger: #a33425;
  --blue: #235b8e;
  --shadow: 0 10px 30px rgba(25, 51, 38, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: #f7faf6;
  color: var(--ink);
  font-family: Arial, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

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

button {
  border: 0;
}

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

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand img {
  width: 148px;
  height: auto;
  display: block;
}

.brand-title {
  font-weight: 700;
  color: var(--green-dark);
  white-space: nowrap;
}

.brand-button {
  cursor: pointer;
  border-radius: 8px;
  padding: 4px 8px;
  margin: -4px -8px;
  transition: background 0.15s ease;
}

.brand-button:hover {
  background: var(--soft);
}

.brand-button:hover .brand-title {
  color: var(--green);
}

.brand-button:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 44px;
  flex: 1;
}

.auth-wrap {
  width: min(560px, calc(100% - 28px));
  margin: 42px auto;
}

.panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.lang-switch {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
  margin-bottom: 18px;
}

.lang-option {
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--muted);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.lang-option:hover {
  border-color: var(--green);
  color: var(--green-dark);
}

.lang-option.active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.lang-option:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.panel.tight {
  padding: 18px;
}

.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.eyebrow {
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.18;
}

h1 {
  font-size: 34px;
  color: var(--green-dark);
}

h2 {
  font-size: 24px;
  color: var(--ink);
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 12px;
}

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

.small {
  font-size: 13px;
}

.field {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
}

.field label {
  font-weight: 700;
  color: var(--ink);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 13px;
  background: var(--white);
  color: var(--ink);
}

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

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

.btn {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  padding: 10px 15px;
  background: var(--green);
  color: white;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  transition: transform 120ms ease, background 120ms ease, opacity 120ms ease;
}

.btn:hover {
  background: var(--green-dark);
}

.btn.primary-action {
  min-height: 48px;
  padding-inline: 20px;
  font-size: 16px;
}

.panel .btn.primary-action {
  width: 100%;
}

.btn:active {
  transform: translateY(1px);
}

.btn.secondary {
  background: var(--soft);
  color: var(--green-dark);
  border: 1px solid var(--line);
}

.btn.secondary:hover {
  background: #eaf2e9;
}

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

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

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

.btn[disabled],
.btn.disabled {
  opacity: 0.52;
  cursor: not-allowed;
  transform: none;
}

.notice {
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  background: var(--soft);
  padding: 12px 14px;
  border-radius: 8px;
  margin: 14px 0;
}

.notice.warning {
  border-left-color: var(--warning);
}

.notice.danger {
  border-left-color: var(--danger);
}

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

.grid.two {
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
}

.grid.compact-fields {
  gap: 12px;
}

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

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

.stat {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.stat .value {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--green-dark);
}

.progress-bar {
  width: 100%;
  height: 12px;
  border-radius: 8px;
  background: #e3ebe4;
  overflow: hidden;
}

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

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

.module-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--white);
}

.module-item.clickable {
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
}

.module-item.clickable:hover {
  border-color: var(--green);
  box-shadow: var(--shadow);
}

.module-item.clickable:hover .module-number {
  background: var(--green);
  border-color: var(--green);
  color: var(--white);
}

.module-item.clickable:active {
  transform: translateY(1px);
}

.module-item.clickable:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.module-item.locked {
  opacity: 0.6;
}

.module-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--soft);
  border: 1px solid var(--line);
  color: var(--green-dark);
  display: grid;
  place-items: center;
  font-weight: 800;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
  background: var(--soft);
  color: var(--green-dark);
  border: 1px solid var(--line);
  white-space: nowrap;
}

.badge.warn {
  color: var(--warning);
  background: #fff8ed;
  border-color: #edd5b5;
}

.badge.danger {
  color: var(--danger);
  background: #fff1ef;
  border-color: #e8c3bd;
}

.course-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.course-nav {
  position: sticky;
  top: 92px;
  display: grid;
  gap: 8px;
}

.nav-step {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
}

.nav-step.active {
  border-color: var(--green);
  box-shadow: inset 4px 0 0 var(--green);
}

.nav-step[disabled] {
  opacity: 0.52;
  cursor: not-allowed;
}

.module-content {
  display: grid;
  gap: 16px;
}

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

.example-pairs {
  display: grid;
  gap: 14px;
}

.example-pair {
  display: grid;
  gap: 4px;
}

.example-pair p {
  margin: 0;
}

.media-block {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfb;
}

.course-video {
  display: block;
  width: 100%;
  max-height: 520px;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  background: #0f1b14;
}

.takeaways {
  margin: 0;
  padding-left: 20px;
}

.takeaways li {
  margin-bottom: 7px;
}

/* ---- Rich content blocks (examples, callouts, schemes) ---- */
.callout {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  background: var(--soft);
  padding: 12px 14px;
  border-radius: 8px;
  margin: 14px 0;
}
.callout.tip { border-left-color: var(--lime); }
.callout.warning { border-left-color: var(--warning); background: #fdf6ec; }
.callout.note { border-left-color: var(--blue); }
.callout-tag {
  flex: none;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--green);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 8px;
  white-space: nowrap;
}
.callout.tip .callout-tag { color: #4a7d12; }
.callout.warning .callout-tag { color: var(--warning); }
.callout.note .callout-tag { color: var(--blue); }
.callout-body { margin: 0; }

.example-card {
  margin: 14px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--white);
}
.example-cap {
  background: var(--green);
  color: var(--white);
  font-weight: 700;
  font-size: 13px;
  padding: 8px 14px;
}
.example-scenario { margin: 12px 14px 0; color: var(--muted); }
.prompt-block,
.result-block { margin: 12px 14px; }
.prompt-tag,
.result-tag {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  color: var(--muted);
}
.prompt-block pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 14px;
  line-height: 1.5;
}
.result-block > div {
  background: #eef6e8;
  border: 1px solid #cfe4c6;
  border-radius: 8px;
  padding: 10px 12px;
}

.steps {
  list-style: none;
  counter-reset: step;
  margin: 14px 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: start;
}
.steps li::before {
  content: counter(step);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--green);
  color: var(--white);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.steps .step-body p { margin: 2px 0 0; color: var(--muted); }

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 8px;
  margin: 14px 0;
}
.flow-node {
  flex: 1 1 auto;
  min-width: 120px;
  text-align: center;
  background: var(--soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--lime);
  border-radius: 8px;
  padding: 12px 10px;
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.flow-arrow {
  display: flex;
  align-items: center;
  color: var(--lime);
  font-size: 20px;
  font-weight: 700;
}
@media (max-width: 640px) {
  .flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); justify-content: center; }
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 14px 0;
}
.compare-col {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.compare-head {
  padding: 10px 14px;
  font-weight: 700;
  color: var(--white);
  background: var(--muted);
}
.compare-good .compare-head { background: var(--green); }
.compare-bad .compare-head { background: var(--danger); }
.compare-col ul { margin: 10px 0; padding: 0 14px 4px 30px; }
.compare-col li { margin-bottom: 6px; }
@media (max-width: 640px) {
  .compare { grid-template-columns: 1fr; }
}

.quiz-option {
  width: 100%;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 8px;
  padding: 13px;
  cursor: pointer;
  text-align: left;
}

.quiz-option:hover {
  border-color: var(--green);
}

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

.admin-toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 180px 160px 180px auto;
  gap: 10px;
  margin-bottom: 14px;
  align-items: end;
}

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

table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
}

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

th {
  background: var(--soft);
  color: var(--green-dark);
  font-size: 13px;
}

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

.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 16px;
}

.footer {
  padding: 18px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.spinner {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 4px solid #dce8df;
  border-top-color: var(--green);
  animation: spin 800ms linear infinite;
  margin: 80px auto;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 880px) {
  .topbar {
    position: static;
    padding: 12px 16px;
    align-items: flex-start;
  }

  .brand {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .brand img {
    width: 132px;
  }

  .brand-title {
    white-space: normal;
  }

  .container {
    width: min(100% - 20px, 1120px);
    padding-top: 18px;
  }

  h1 {
    font-size: 28px;
  }

  .grid.two,
  .grid.three,
  .course-layout,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .course-nav {
    position: static;
  }

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

  .page-head {
    display: grid;
  }

  .module-item {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .module-item .badge {
    grid-column: 2;
    justify-self: start;
  }
}