/* ===================================================================
 * Prompt Injiniring va AI Asoslari — O'quv Dasturi
 * GitHub Primer ilhomlangan minimalistik design system
 * =================================================================== */

/* ---------- Color tokens (Primer-inspired) ---------- */
:root {
  /* Canvas */
  --canvas-default: #ffffff;
  --canvas-subtle: #f6f8fa;
  --canvas-inset: #f6f8fa;
  --canvas-overlay: #ffffff;

  /* Border */
  --border-default: #d1d9e0;
  --border-muted: #d8dee4;

  /* Foreground */
  --fg-default: #1f2328;
  --fg-muted: #59636e;
  --fg-subtle: #6e7781;
  --fg-on-emphasis: #ffffff;

  /* Accent */
  --accent-fg: #0969da;
  --accent-emphasis: #0969da;
  --accent-muted: rgba(84, 174, 255, 0.4);
  --accent-subtle: #ddf4ff;

  /* Success / Attention / Danger */
  --success-fg: #1a7f37;
  --success-emphasis: #1f883d;
  --success-subtle: #dafbe1;
  --attention-fg: #9a6700;
  --attention-subtle: #fff8c5;
  --danger-fg: #d1242f;
  --danger-subtle: #ffebe9;

  /* Neutral chips */
  --neutral-emphasis: #59636e;
  --neutral-muted: rgba(175, 184, 193, 0.2);

  /* Shadow */
  --shadow-small: 0 1px 0 rgba(31, 35, 40, 0.04);
  --shadow-medium: 0 3px 6px rgba(140, 149, 159, 0.15);
  --shadow-large: 0 8px 24px rgba(140, 149, 159, 0.2);

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
}

[data-theme="dark"] {
  --canvas-default: #0d1117;
  --canvas-subtle: #161b22;
  --canvas-inset: #010409;
  --canvas-overlay: #161b22;

  --border-default: #30363d;
  --border-muted: #21262d;

  --fg-default: #e6edf3;
  --fg-muted: #9198a1;
  --fg-subtle: #6e7681;
  --fg-on-emphasis: #ffffff;

  --accent-fg: #4493f8;
  --accent-emphasis: #1f6feb;
  --accent-muted: rgba(56, 139, 253, 0.4);
  --accent-subtle: rgba(56, 139, 253, 0.15);

  --success-fg: #3fb950;
  --success-emphasis: #238636;
  --success-subtle: rgba(46, 160, 67, 0.15);
  --attention-fg: #d29922;
  --attention-subtle: rgba(187, 128, 9, 0.15);
  --danger-fg: #f85149;
  --danger-subtle: rgba(248, 81, 73, 0.15);

  --neutral-emphasis: #6e7681;
  --neutral-muted: rgba(110, 118, 129, 0.4);

  --shadow-small: 0 0 transparent;
  --shadow-medium: 0 3px 6px rgba(1, 4, 9, 0.85);
  --shadow-large: 0 8px 24px rgba(1, 4, 9, 0.85);
}

/* ---------- Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg-default);
  background-color: var(--canvas-default);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent-fg);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

/* ---------- Layout primitives ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 1012px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Site nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--canvas-default);
  border-bottom: 1px solid var(--border-default);
  backdrop-filter: saturate(180%) blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 56px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg-default);
  font-weight: 600;
  font-size: 14px;
}

.site-brand:hover {
  text-decoration: none;
  color: var(--fg-default);
}

.site-brand__mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, #0969da 0%, #1f6feb 100%);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: -0.02em;
}

.site-brand__title {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__title small {
  color: var(--fg-muted);
  font-weight: 400;
  font-size: 12px;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__link {
  padding: 6px 12px;
  color: var(--fg-default);
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  transition: background-color 0.12s ease;
}

.site-nav__link:hover {
  background-color: var(--canvas-subtle);
  text-decoration: none;
}

.site-nav__link.is-active {
  background-color: var(--canvas-subtle);
}

.theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: 1px solid var(--border-default);
  background-color: var(--canvas-default);
  color: var(--fg-default);
  display: grid;
  place-items: center;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

.theme-toggle:hover {
  background-color: var(--canvas-subtle);
  border-color: var(--fg-muted);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 80px 0 56px;
  border-bottom: 1px solid var(--border-default);
  background:
    radial-gradient(ellipse at top, var(--accent-subtle) 0%, transparent 60%),
    var(--canvas-default);
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: var(--accent-subtle);
  color: var(--accent-fg);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 20px;
  border: 1px solid var(--accent-muted);
}

.hero__title {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--fg-default);
}

.hero__subtitle {
  font-size: 18px;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 720px;
  margin: 0 0 32px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-default);
  background-color: var(--canvas-default);
  font-size: 13px;
  color: var(--fg-muted);
}

.meta-pill__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--success-emphasis);
}

/* ---------- Section ---------- */
.section {
  padding: 56px 0;
}

.section + .section {
  border-top: 1px solid var(--border-default);
}

.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.section__title {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--fg-default);
}

.section__title-eyebrow {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 6px;
}

.section__count {
  font-size: 13px;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- Module group ---------- */
.module {
  margin-top: 48px;
}

.module:first-child {
  margin-top: 0;
}

.module__header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-muted);
}

.module__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  border-radius: 6px;
  background-color: var(--canvas-subtle);
  border: 1px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--fg-muted);
}

.module__title {
  font-size: 18px;
  font-weight: 600;
  margin: 0;
  color: var(--fg-default);
}

.module__range {
  margin-left: auto;
  font-size: 13px;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}

/* ---------- Lesson cards grid ---------- */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.lesson-card {
  display: flex;
  flex-direction: column;
  position: relative;
  padding: 20px;
  border: 1px solid var(--border-default);
  border-radius: 8px;
  background-color: var(--canvas-default);
  transition: border-color 0.15s ease, transform 0.15s ease,
    box-shadow 0.15s ease;
  color: var(--fg-default);
  height: 100%;
  min-height: 200px;
}

.lesson-card:hover {
  border-color: var(--accent-fg);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.lesson-card.is-pending {
  cursor: not-allowed;
  opacity: 0.65;
}

.lesson-card.is-pending:hover {
  border-color: var(--border-default);
  transform: none;
  box-shadow: none;
}

.lesson-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.lesson-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background-color: var(--canvas-subtle);
  border: 1px solid var(--border-default);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--fg-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  border: 1px solid transparent;
  font-variant-numeric: tabular-nums;
}

.status-badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-badge--ready {
  color: var(--success-fg);
  background-color: var(--success-subtle);
  border-color: rgba(46, 160, 67, 0.3);
}

.status-badge--ready .status-badge__dot {
  background-color: var(--success-emphasis);
}

.status-badge--pending {
  color: var(--fg-muted);
  background-color: var(--canvas-subtle);
  border-color: var(--border-default);
}

.status-badge--pending .status-badge__dot {
  background-color: var(--fg-subtle);
}

.status-badge--draft {
  color: var(--attention-fg);
  background-color: var(--attention-subtle);
  border-color: rgba(212, 167, 44, 0.3);
}

.status-badge--draft .status-badge__dot {
  background-color: var(--attention-fg);
}

.lesson-card__title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 0 0 8px;
  color: var(--fg-default);
  line-height: 1.35;
}

.lesson-card__summary {
  font-size: 13px;
  line-height: 1.55;
  color: var(--fg-muted);
  margin: 0 0 16px;
  flex: 1;
}

.lesson-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border-muted);
}

.lesson-card__duration {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--fg-muted);
}

.lesson-card__duration svg {
  width: 12px;
  height: 12px;
}

.lesson-card__tools {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  justify-content: flex-end;
}

.tool-chip {
  font-size: 10px;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
  background-color: var(--canvas-subtle);
  border: 1px solid var(--border-muted);
  color: var(--fg-muted);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

/* ---------- Lesson page layout ---------- */
.lesson-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 240px;
  gap: 40px;
  padding: 40px 0 80px;
  align-items: start;
}

@media (max-width: 1100px) {
  .lesson-layout {
    grid-template-columns: 200px minmax(0, 1fr);
  }
  .lesson-aside {
    display: none;
  }
}

@media (max-width: 768px) {
  .lesson-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }
  .lesson-sidebar {
    position: static;
    max-height: none;
    border: 1px solid var(--border-default);
    border-radius: 8px;
    padding: 16px;
  }
}

/* Sidebar (TOC + lessons list) */
.lesson-sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  padding-right: 8px;
}

.lesson-sidebar__group {
  margin-bottom: 24px;
}

.lesson-sidebar__group:last-child {
  margin-bottom: 0;
}

.lesson-sidebar__label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  margin: 0 0 12px;
}

.lesson-sidebar__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lesson-sidebar__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-radius: 6px;
  color: var(--fg-muted);
  font-size: 13px;
  line-height: 1.4;
  transition: background-color 0.12s ease, color 0.12s ease;
}

.lesson-sidebar__list a:hover {
  background-color: var(--canvas-subtle);
  color: var(--fg-default);
  text-decoration: none;
}

.lesson-sidebar__list a.is-active {
  color: var(--accent-fg);
  background-color: var(--accent-subtle);
  font-weight: 500;
}

.lesson-sidebar__list .indent-2 {
  padding-left: 24px;
  font-size: 12px;
}

.lesson-sidebar__list .indent-3 {
  padding-left: 40px;
  font-size: 12px;
  color: var(--fg-subtle);
}

/* Right aside — meta */
.lesson-aside {
  position: sticky;
  top: 80px;
}

.meta-card {
  border: 1px solid var(--border-default);
  border-radius: 8px;
  background-color: var(--canvas-default);
  padding: 16px;
  margin-bottom: 16px;
}

.meta-card__title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  margin: 0 0 12px;
}

.meta-card__row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 0;
  font-size: 13px;
}

.meta-card__row + .meta-card__row {
  border-top: 1px solid var(--border-muted);
}

.meta-card__key {
  color: var(--fg-muted);
}

.meta-card__value {
  color: var(--fg-default);
  font-weight: 500;
  text-align: right;
}

.meta-card__tools {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}

/* ---------- Lesson markdown content ---------- */
.lesson-content {
  min-width: 0;
}

.lesson-content__breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.lesson-content__breadcrumb a {
  color: var(--fg-muted);
}

.lesson-content__breadcrumb a:hover {
  color: var(--accent-fg);
}

.lesson-content__breadcrumb-sep {
  color: var(--fg-subtle);
}

.markdown-body {
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg-default);
  word-wrap: break-word;
}

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

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

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 32px 0 16px;
  scroll-margin-top: 80px;
}

.markdown-body h1 {
  font-size: 32px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-muted);
  margin-top: 0;
}

.markdown-body h2 {
  font-size: 24px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-muted);
  margin-top: 40px;
}

.markdown-body h3 {
  font-size: 20px;
  margin-top: 32px;
}

.markdown-body h4 {
  font-size: 16px;
  margin-top: 24px;
}

.markdown-body p {
  margin: 0 0 16px;
}

.markdown-body strong {
  font-weight: 600;
  color: var(--fg-default);
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 28px;
  margin: 0 0 16px;
}

.markdown-body li {
  margin: 4px 0;
}

.markdown-body li > p {
  margin: 8px 0;
}

.markdown-body blockquote {
  margin: 0 0 16px;
  padding: 0 16px;
  color: var(--fg-muted);
  border-left: 4px solid var(--border-default);
  background-color: var(--canvas-subtle);
  border-radius: 0 6px 6px 0;
  padding: 12px 16px;
}

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

.markdown-body hr {
  height: 1px;
  border: 0;
  background-color: var(--border-muted);
  margin: 32px 0;
}

.markdown-body a {
  color: var(--accent-fg);
  text-decoration: none;
}

.markdown-body a:hover {
  text-decoration: underline;
}

/* Tables */
.markdown-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 16px;
  font-size: 14px;
}

.markdown-body table th,
.markdown-body table td {
  padding: 8px 13px;
  border: 1px solid var(--border-default);
  text-align: left;
  vertical-align: top;
}

.markdown-body table th {
  background-color: var(--canvas-subtle);
  font-weight: 600;
}

.markdown-body table tr:nth-child(2n) td {
  background-color: var(--canvas-subtle);
}

/* Code */
.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.2em 0.4em;
  background-color: var(--neutral-muted);
  border-radius: 4px;
}

.markdown-body pre {
  background-color: var(--canvas-subtle);
  border: 1px solid var(--border-muted);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.5;
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
  border-radius: 0;
  font-size: inherit;
  white-space: pre;
}

/* Footer nav between lessons */
.lesson-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border-default);
}

.lesson-pagination__link {
  display: block;
  padding: 16px 20px;
  border: 1px solid var(--border-default);
  border-radius: 8px;
  background-color: var(--canvas-default);
  color: var(--fg-default);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.lesson-pagination__link:hover {
  border-color: var(--accent-fg);
  background-color: var(--canvas-subtle);
  text-decoration: none;
}

.lesson-pagination__link.is-disabled {
  opacity: 0.4;
  pointer-events: none;
}

.lesson-pagination__direction {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--fg-muted);
  margin-bottom: 6px;
}

.lesson-pagination__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg-default);
}

.lesson-pagination__link--prev {
  text-align: left;
}

.lesson-pagination__link--next {
  text-align: right;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-default);
  padding: 32px 0;
  font-size: 13px;
  color: var(--fg-muted);
  background-color: var(--canvas-subtle);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
}

/* ---------- Loading / Empty states ---------- */
.loading {
  padding: 80px 0;
  text-align: center;
  color: var(--fg-muted);
}

.loading__spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-default);
  border-top-color: var(--accent-fg);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}

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

.empty-state {
  padding: 60px 24px;
  text-align: center;
  border: 1px dashed var(--border-default);
  border-radius: 8px;
  color: var(--fg-muted);
}

/* ---------- Utilities ---------- */
.text-muted {
  color: var(--fg-muted);
}

.mono {
  font-family: var(--font-mono);
}

.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;
}

/* Scrollbar polish (webkit only) */
.lesson-sidebar::-webkit-scrollbar {
  width: 6px;
}

.lesson-sidebar::-webkit-scrollbar-thumb {
  background-color: var(--border-default);
  border-radius: 3px;
}

.lesson-sidebar::-webkit-scrollbar-track {
  background: transparent;
}