:root {
  --bg: #f4efe4;
  --bg-soft: #fff9ed;
  --paper: rgba(255, 255, 255, 0.8);
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --ink: #16302b;
  --muted: #5d6e69;
  --line: rgba(22, 48, 43, 0.1);
  --brand: #0f766e;
  --brand-dark: #0b3c49;
  --warm: #d97706;
  --warm-soft: #ffedd5;
  --success: #166534;
  --danger: #b91c1c;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html.modal-open,
html.modal-open body {
  overflow: hidden;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Aptos, "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.14), transparent 24%),
    radial-gradient(circle at top right, rgba(217, 119, 6, 0.15), transparent 26%),
    linear-gradient(180deg, #f5efe3, #fcfaf5 38%, #eef7f4);
}

img {
  display: block;
  max-width: 100%;
}

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

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

pre,
code {
  font-family: Consolas, "Courier New", monospace;
}

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

.page-main {
  padding-bottom: 80px;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 30;
  width: min(calc(100% - 32px), var(--max));
  margin: 18px auto 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 16px 20px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.1);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark strong {
  display: block;
  font-size: 1rem;
}

.brand-mark small {
  color: var(--muted);
}

.brand-mark__badge {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: white;
  font-weight: 700;
}

.site-nav {
  display: inline-flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.site-nav a,
.user-pill,
.pill {
  padding: 10px 14px;
  border-radius: 999px;
}

.site-nav a {
  color: var(--muted);
}

.site-nav a.is-active,
.site-nav a:hover {
  background: rgba(15, 118, 110, 0.1);
  color: var(--brand-dark);
}

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

.user-pill {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.user-pill button {
  border: 0;
  background: transparent;
  color: var(--brand-dark);
  cursor: pointer;
}

.button,
.button:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 16px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.14);
}

.button--primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: white;
}

.button--dark {
  background: var(--brand-dark);
  color: white;
}

.button--ghost {
  background: rgba(255, 255, 255, 0.62);
  border-color: var(--line);
  color: var(--ink);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--warm);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 24px;
}

.section-head h2,
.hero-copy h1,
.page-title {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.02;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 42px 0 24px;
}

.hero__panel {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: stretch;
  padding: 36px;
  border-radius: 40px;
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.7), transparent 28%),
    linear-gradient(135deg, rgba(255, 250, 241, 0.9), rgba(220, 244, 238, 0.88));
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.hero-copy h1 {
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  max-width: 10ch;
}

.hero-copy p {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.06rem;
}

.hero-badges,
.button-row,
.stat-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pill {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(15, 118, 110, 0.12);
}

.stat-row {
  margin-top: 26px;
}

.stat-card,
.glass-card,
.feature-card,
.course-card,
.panel,
.lesson-card,
.quiz-card,
.runner-shell,
.admin-card,
.dashboard-card {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.stat-card {
  flex: 1 1 180px;
  min-width: 180px;
  padding: 18px 20px;
}

.stat-card strong {
  display: block;
  font-size: 2rem;
  font-family: Georgia, serif;
}

.glass-card,
.panel,
.admin-card,
.dashboard-card {
  padding: 24px;
}

.feature-grid,
.courses-grid,
.stats-grid,
.dashboard-grid,
.admin-grid {
  display: grid;
  gap: 20px;
}

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

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

.stats-grid,
.dashboard-grid,
.admin-grid {
  grid-template-columns: repeat(4, 1fr);
}

.feature-card,
.course-card {
  padding: 24px;
}

.feature-card h3,
.course-card h3,
.panel h3,
.admin-card h3,
.dashboard-card h3 {
  margin-top: 0;
}

.feature-card p,
.course-card p,
.panel p,
.admin-card p,
.dashboard-card p,
.hero-card p {
  color: var(--muted);
}

.hero-card {
  display: grid;
  gap: 18px;
  padding: 26px;
  border-radius: 32px;
  background: rgba(13, 53, 64, 0.94);
  color: white;
}

.hero-card__meter {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  overflow: hidden;
}

.hero-card__meter span {
  display: block;
  width: 72%;
  height: 100%;
  background: linear-gradient(90deg, #fbbf24, #86efac);
}

.account-banner {
  margin: 32px 0;
  padding: 24px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-radius: 32px;
  background: linear-gradient(135deg, rgba(255, 247, 235, 0.96), rgba(221, 244, 240, 0.92));
  border: 1px solid rgba(15, 118, 110, 0.08);
  box-shadow: 0 20px 44px rgba(15, 23, 42, 0.08);
}

.account-banner--warm {
  background: linear-gradient(135deg, rgba(220, 244, 238, 0.96), rgba(255, 252, 239, 0.92));
}

.course-card__meta,
.inline-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.92rem;
}

.course-card__swatch {
  width: 46px;
  height: 10px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.is-coming-soon {
  opacity: 0.82;
}

.site-footer {
  width: min(calc(100% - 32px), var(--max));
  margin: 30px auto 42px;
  padding: 26px;
  border-radius: 32px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: start;
}

.ad-shell {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px dashed rgba(15, 118, 110, 0.24);
}

.page-ad-band {
  margin: 22px auto 0;
}

.ad-shell img {
  width: 100%;
  border-radius: 22px;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.ad-tag {
  display: inline-flex;
  width: fit-content;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.12);
  color: var(--brand-dark);
  font-size: 0.8rem;
  font-weight: 700;
}

.ad-shell pre {
  margin: 0;
  padding: 18px;
  overflow: auto;
  border-radius: 22px;
  background: #102228;
  color: #f8fafc;
}

.split-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 22px;
}

.course-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 280px;
  gap: 22px;
  align-items: start;
}

.course-rail {
  display: grid;
  gap: 18px;
  align-content: start;
}

.sidebar-stack {
  display: grid;
  gap: 18px;
  align-content: start;
}

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

.course-nav button {
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
}

.course-nav button.is-active {
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.15), rgba(15, 118, 110, 0.05));
  border-color: rgba(15, 118, 110, 0.24);
}

.lesson-track {
  display: grid;
  gap: 14px;
}

.lesson-card {
  padding: 18px 20px;
  cursor: pointer;
}

.lesson-card--button {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.78);
}

.lesson-card.is-active {
  outline: 2px solid rgba(15, 118, 110, 0.24);
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(255, 255, 255, 0.9));
}

.lesson-card strong {
  display: block;
  margin-bottom: 6px;
}

.lesson-layout {
  display: grid;
  gap: 22px;
}

.lesson-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  align-items: end;
}

.course-bottom-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.course-bottom-nav__status {
  min-width: 180px;
  text-align: center;
  color: var(--muted);
  font-weight: 700;
}

.progress-line {
  width: 100%;
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.08);
}

.progress-line span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--brand), var(--warm));
}

.runner-shell {
  overflow: hidden;
}

.runner-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 18px 0;
  flex-wrap: wrap;
}

.runner-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 18px;
}

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

.runner-grid--single {
  grid-template-columns: 1fr;
}

.editor-pane {
  display: grid;
  gap: 8px;
}

.editor-pane textarea,
.runner-console,
.runner-preview {
  width: 100%;
  min-height: 220px;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid rgba(15, 23, 42, 0.1);
  background: #102228;
  color: #e2f5f2;
}

.editor-pane--large textarea,
.code-editor--large {
  min-height: 560px;
  height: 560px;
  resize: none;
}

.editor-pane textarea {
  resize: vertical;
}

.runner-preview {
  background: white;
  padding: 0;
  overflow: hidden;
}

.runner-preview iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: white;
}

.runner-console {
  white-space: pre-wrap;
  overflow: auto;
}

.quiz-card {
  padding: 24px;
}

.quiz-option-list {
  display: grid;
  gap: 12px;
}

.quiz-option {
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  cursor: pointer;
  text-align: left;
}

.quiz-option.is-correct {
  background: rgba(22, 101, 52, 0.1);
  border-color: rgba(22, 101, 52, 0.4);
}

.quiz-option.is-wrong {
  background: rgba(185, 28, 28, 0.08);
  border-color: rgba(185, 28, 28, 0.35);
}

.tag-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tag {
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  color: var(--muted);
}

.mini-list,
.admin-list,
.metric-list {
  display: grid;
  gap: 10px;
}

.course-preview-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 16px 0 0;
}

.course-preview-list li {
  list-style: none;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(15, 118, 110, 0.08);
  color: var(--brand-dark);
}

.mini-list li,
.admin-list li,
.metric-list li {
  list-style: none;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.stack-form,
.admin-form {
  display: grid;
  gap: 12px;
}

.stack-form input,
.stack-form select,
.admin-form input,
.admin-form select,
.admin-form textarea,
#onboarding-form input,
#onboarding-form select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid rgba(15, 23, 42, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.88);
}

.admin-form textarea {
  min-height: 120px;
  resize: vertical;
}

.wizard-steps {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.wizard-steps span {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.08);
  color: var(--muted);
  font-weight: 700;
}

.wizard-steps span.is-active {
  background: var(--brand);
  color: white;
}

.wizard-panel {
  display: none;
  gap: 12px;
}

.wizard-panel.is-active {
  display: grid;
}

.wizard-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
}

.inline-note,
.otp-preview {
  margin: 0 0 16px;
  color: var(--muted);
}

.otp-preview {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(15, 118, 110, 0.08);
  color: var(--brand-dark);
  font-weight: 700;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  z-index: 80;
}

.modal.is-open {
  display: grid;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(13, 20, 23, 0.56);
  backdrop-filter: blur(8px);
}

.modal__panel {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 24px), 520px);
  margin: auto;
  padding: 26px;
  border-radius: 30px;
  background: var(--surface-strong);
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.22);
}

.modal__panel--wide {
  width: min(calc(100% - 24px), 680px);
}

.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  border: 0;
  background: rgba(15, 23, 42, 0.06);
  border-radius: 999px;
  padding: 10px 12px;
  cursor: pointer;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  max-width: 340px;
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--brand-dark);
  color: white;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hide {
  display: none !important;
}

.placement-editor-grid,
.placement-preview-grid {
  display: grid;
  gap: 16px;
}

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

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

.placement-fieldset {
  min-width: 0;
  margin: 0;
  padding: 18px;
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.7);
}

.placement-fieldset legend {
  padding: 0 8px;
  color: var(--brand-dark);
  font-weight: 700;
}

.runner-popout {
  min-height: 100vh;
  padding: 18px;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.16), transparent 24%),
    radial-gradient(circle at top right, rgba(217, 119, 6, 0.14), transparent 24%),
    linear-gradient(180deg, #f5efe3, #fcfaf5 42%, #eef7f4);
}

.runner-topbar {
  width: min(100%, 1600px);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
}

.runner-workbench {
  width: min(100%, 1600px);
  margin: 18px auto 0;
  display: grid;
  grid-template-columns: minmax(360px, 0.95fr) minmax(420px, 1.05fr);
  gap: 18px;
}

.runner-column {
  min-width: 0;
  padding: 18px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.runner-column--output {
  display: grid;
}

.runner-stack {
  display: grid;
  gap: 12px;
}

.runner-output-panel {
  display: grid;
  gap: 12px;
  height: 100%;
}

.runner-output-panel .runner-preview,
.runner-output-panel .runner-console {
  min-height: 560px;
}

@media (max-width: 1100px) {
  .feature-grid,
  .courses-grid,
  .stats-grid,
  .dashboard-grid,
  .admin-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero__panel,
  .split-layout,
  .course-layout {
    grid-template-columns: 1fr;
  }

  .course-rail--left {
    order: 2;
  }

  .lesson-layout {
    order: 1;
  }

  .course-rail--right {
    order: 3;
  }

  .runner-grid,
  .runner-workbench,
  .placement-editor-grid,
  .placement-preview-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    grid-template-columns: 1fr;
    border-radius: 28px;
  }

  .site-nav,
  .header-actions,
  .button-row,
  .section-head,
  .account-banner,
  .site-footer,
  .lesson-header,
  .wizard-actions,
  .runner-topbar,
  .course-bottom-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .feature-grid,
  .courses-grid,
  .stats-grid,
  .dashboard-grid,
  .admin-grid {
    grid-template-columns: 1fr;
  }

  .hero__panel,
  .glass-card,
  .panel,
  .admin-card,
  .dashboard-card,
  .course-card,
  .feature-card {
    padding: 22px;
  }

  .hero-copy h1 {
    max-width: none;
  }
}