/* inter-cyrillic-ext-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-cyrillic-ext-wght-normal.BOeWTOD4.woff2) format('woff2-variations');
  unicode-range: U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F;
}

/* inter-cyrillic-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-cyrillic-wght-normal.DqGufNeO.woff2) format('woff2-variations');
  unicode-range: U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;
}

/* inter-greek-ext-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-greek-ext-wght-normal.DlzME5K_.woff2) format('woff2-variations');
  unicode-range: U+1F00-1FFF;
}

/* inter-greek-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-greek-wght-normal.CkhJZR-_.woff2) format('woff2-variations');
  unicode-range: U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF;
}

/* inter-vietnamese-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-vietnamese-wght-normal.CBcvBZtf.woff2) format('woff2-variations');
  unicode-range: U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;
}

/* inter-latin-ext-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-latin-ext-wght-normal.DO1Apj_S.woff2) format('woff2-variations');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}

/* inter-latin-wght-normal */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2) format('woff2-variations');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}/* jetbrains-mono-cyrillic-ext-wght-normal */
@font-face {
  font-family: 'JetBrains Mono Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url(data:font/woff2;base64,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) format('woff2-variations');
  unicode-range: U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F;
}

/* jetbrains-mono-cyrillic-wght-normal */
@font-face {
  font-family: 'JetBrains Mono Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url(/_astro/jetbrains-mono-cyrillic-wght-normal.D73BlboJ.woff2) format('woff2-variations');
  unicode-range: U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;
}

/* jetbrains-mono-greek-wght-normal */
@font-face {
  font-family: 'JetBrains Mono Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url(/_astro/jetbrains-mono-greek-wght-normal.Bw9x6K1M.woff2) format('woff2-variations');
  unicode-range: U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF;
}

/* jetbrains-mono-vietnamese-wght-normal */
@font-face {
  font-family: 'JetBrains Mono Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url(/_astro/jetbrains-mono-vietnamese-wght-normal.Bt-aOZkq.woff2) format('woff2-variations');
  unicode-range: U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;
}

/* jetbrains-mono-latin-ext-wght-normal */
@font-face {
  font-family: 'JetBrains Mono Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url(/_astro/jetbrains-mono-latin-ext-wght-normal.DBQx-q_a.woff2) format('woff2-variations');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}

/* jetbrains-mono-latin-wght-normal */
@font-face {
  font-family: 'JetBrains Mono Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url(/_astro/jetbrains-mono-latin-wght-normal.B9CIFXIH.woff2) format('woff2-variations');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}/* ==========================================================================
   o30m Academy — design tokens and global styles
   Palette from the approved CyberCourse dark UI style guide.
   ========================================================================== */

:root {
  color-scheme: dark;

  --red: #e02424;
  --red-bright: #f05252;
  --red-dark: #b91c1c;
  --bg: #0b0f17;
  --bg-deep: #070a10;
  --surface: #111827;
  --surface-2: #161f30;
  --surface-3: #1b2638;
  --border: #1f2937;
  --border-strong: #2b3a50;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --muted-2: #6b7280;
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.1);
  --warning: #fbbf24;
  --warning-bg: rgba(251, 191, 36, 0.1);
  --info: #60a5fa;
  --info-bg: rgba(96, 165, 250, 0.1);
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.1);

  --font-sans: 'Inter Variable', Inter, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono Variable', 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;

  --max-width: 1200px;
  --reading-width: 74ch;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
  --header-height: 68px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 var(--space-4);
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #f3f4f6;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

p,
ul,
ol,
dl,
figure,
blockquote {
  margin: 0 0 var(--space-4);
}

ul,
ol {
  padding-left: 1.4rem;
}

li + li {
  margin-top: var(--space-2);
}

a {
  color: var(--red-bright);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #fca5a5;
}

strong {
  color: #f9fafb;
  font-weight: 650;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: var(--space-6) 0;
}

::selection {
  background: rgba(224, 36, 36, 0.4);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--red-bright);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--red);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-3);
}

.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;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2.5rem, 860px);
  margin-inline: auto;
}

.section {
  padding-block: var(--space-8);
}

.section--tight {
  padding-block: var(--space-7);
}

.section--alt {
  background: var(--bg-deep);
  border-block: 1px solid var(--border);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  color: var(--red-bright);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: '';
  width: 18px;
  height: 2px;
  background: var(--red);
}

.lead {
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  color: var(--muted);
  max-width: 68ch;
}

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

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

.stack > * + * {
  margin-top: var(--space-4);
}

.grid {
  display: grid;
  gap: var(--space-5);
}

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

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

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

@media (max-width: 900px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .container,
  .container--narrow {
    width: min(100% - 1.5rem, var(--max-width));
  }
}

/* --------------------------------------------------------------------------
   Header and footer
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: rgba(11, 15, 23, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: #fff;
}

.brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-strong);
}

.brand__name {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name span:last-child {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: #fff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-toggle {
  display: none;
  padding: var(--space-2);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 840px) {
  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
  }

  .site-nav[data-open='true'] {
    display: flex;
  }

  .site-nav a {
    padding: var(--space-3);
    border-radius: var(--radius-sm);
  }

  .site-nav a:hover {
    background: var(--surface-2);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-actions .btn--header {
    display: none;
  }
}

.site-footer {
  margin-top: var(--space-8);
  padding-block: var(--space-7);
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: var(--space-6);
}

.site-footer h2 {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-3);
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li + li {
  margin-top: var(--space-2);
}

.site-footer a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-footer a:hover {
  color: var(--red-bright);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  color: var(--muted-2);
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Buttons, badges, pills
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0.7rem 1.1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--red);
  color: #fff;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  background: var(--red-dark);
  color: #fff;
}

.btn:disabled,
.btn[aria-disabled='true'] {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn--secondary {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}

.btn--secondary:hover {
  background: var(--surface-2);
  border-color: var(--muted-2);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--muted);
  padding-inline: 0.6rem;
}

.btn--ghost:hover {
  background: var(--surface-2);
  color: #fff;
}

.btn--sm {
  min-height: 36px;
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
}

.btn--block {
  width: 100%;
}

.btn--google {
  background: #fff;
  color: #1f2937;
}

.btn--google:hover {
  background: #e5e7eb;
  color: #111827;
}

.btn--google svg {
  width: 18px;
  height: 18px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge--red {
  border-color: rgba(224, 36, 36, 0.4);
  background: rgba(224, 36, 36, 0.1);
  color: #fca5a5;
}

.badge--success {
  border-color: rgba(52, 211, 153, 0.35);
  background: var(--success-bg);
  color: var(--success);
}

.badge--warning {
  border-color: rgba(251, 191, 36, 0.35);
  background: var(--warning-bg);
  color: var(--warning);
}

.badge--muted {
  color: var(--muted-2);
}

.price {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.price del {
  color: var(--muted-2);
  font-size: 1.05rem;
}

.price strong {
  color: var(--success);
  font-size: 1.6rem;
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
}

.card--interactive {
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card--interactive:hover {
  border-color: var(--border-strong);
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.card h3 {
  margin-bottom: var(--space-2);
}

.card__icon {
  margin-bottom: var(--space-3);
  color: var(--red-bright);
}

.card p:last-child {
  margin-bottom: 0;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat strong {
  font-size: 1.35rem;
}

.stat span {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background: var(--bg-deep);
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.32;
}

.hero__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(11, 15, 23, 0.98) 0%, rgba(11, 15, 23, 0.72) 45%, rgba(11, 15, 23, 0.45) 100%),
    linear-gradient(0deg, var(--bg) 0%, transparent 45%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: var(--space-7);
  align-items: center;
  min-height: 620px;
  padding-block: var(--space-9);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin-bottom: var(--space-4);
}

.hero h1 span {
  color: var(--red);
}

.hero__subtitle {
  margin: 0 0 var(--space-4);
  color: #d1d5db;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  font-weight: 500;
}

.hero__copy {
  max-width: 58ch;
  color: var(--muted);
  margin-bottom: var(--space-5);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  font-size: 0.84rem;
}

.hero__facts span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero__facts svg {
  width: 15px;
  height: 15px;
  color: var(--red-bright);
}

.hero__panel {
  padding: var(--space-5);
  background: rgba(17, 24, 39, 0.82);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.hero__panel h2 {
  font-size: 1.05rem;
  margin-bottom: var(--space-3);
}

.hero__panel ul {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4);
}

.hero__panel li {
  display: flex;
  gap: var(--space-3);
  padding-block: 0.55rem;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.hero__panel li:last-child {
  border-bottom: 0;
}

.hero__panel li svg {
  flex: none;
  width: 17px;
  height: 17px;
  margin-top: 0.18rem;
  color: var(--success);
}

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-block: var(--space-8);
  }

  .hero__panel {
    max-width: 520px;
  }
}

/* --------------------------------------------------------------------------
   Course curriculum
   -------------------------------------------------------------------------- */

.curriculum {
  display: grid;
  gap: var(--space-3);
}

.curriculum__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
}

.curriculum__item:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.curriculum__number {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--red-bright);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
}

.curriculum__body h3 {
  margin: 0 0 0.15rem;
  font-size: 1rem;
}

.curriculum__body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.curriculum__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

@media (max-width: 640px) {
  .curriculum__item {
    grid-template-columns: auto 1fr;
  }

  .curriculum__meta {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  margin: var(--space-5) 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table,
.content-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

caption {
  padding: var(--space-3) var(--space-4);
  color: var(--muted);
  font-size: 0.82rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th,
td {
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-2);
  color: #f3f4f6;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

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

tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */

.form {
  display: grid;
  gap: var(--space-4);
}

.field {
  display: grid;
  gap: var(--space-2);
}

.field label,
.field legend {
  color: #f3f4f6;
  font-size: 0.9rem;
  font-weight: 600;
}

.field__hint {
  color: var(--muted);
  font-size: 0.8rem;
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 44px;
  padding: 0.65rem 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  font: inherit;
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--red);
  outline: none;
  box-shadow: 0 0 0 3px rgba(224, 36, 36, 0.18);
}

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

.checkbox {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  color: var(--muted);
  font-size: 0.9rem;
}

.checkbox input {
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
  accent-color: var(--red);
}

.form-error {
  padding: var(--space-3) var(--space-4);
  border: 1px solid rgba(248, 113, 113, 0.4);
  border-radius: var(--radius-sm);
  background: var(--danger-bg);
  color: #fecaca;
  font-size: 0.9rem;
}

.form-success {
  padding: var(--space-3) var(--space-4);
  border: 1px solid rgba(52, 211, 153, 0.4);
  border-radius: var(--radius-sm);
  background: var(--success-bg);
  color: #a7f3d0;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Callouts
   -------------------------------------------------------------------------- */

.callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  padding: var(--space-4);
  margin: var(--space-5) 0;
  border: 1px solid var(--border-strong);
  border-left: 3px solid var(--info);
  border-radius: var(--radius-sm);
  background: var(--info-bg);
}

.callout svg {
  width: 20px;
  height: 20px;
  margin-top: 0.15rem;
  color: var(--info);
}

.callout strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.callout p:last-child {
  margin-bottom: 0;
}

.callout--tip {
  border-left-color: var(--success);
  background: var(--success-bg);
}

.callout--tip svg {
  color: var(--success);
}

.callout--warning {
  border-left-color: var(--warning);
  background: var(--warning-bg);
}

.callout--warning svg {
  color: var(--warning);
}

.callout--danger {
  border-left-color: var(--danger);
  background: var(--danger-bg);
}

.callout--danger svg {
  color: var(--danger);
}

/* --------------------------------------------------------------------------
   Learning shell
   -------------------------------------------------------------------------- */

.learn-shell {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: var(--space-6);
  width: min(100% - 2.5rem, 1400px);
  margin-inline: auto;
  padding-block: var(--space-6);
  align-items: start;
}

.learn-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  max-height: calc(100vh - var(--header-height) - var(--space-6));
  overflow-y: auto;
  padding-right: var(--space-2);
  scrollbar-width: thin;
}

.learn-sidebar__head {
  padding: var(--space-3) var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-3);
}

.learn-sidebar__head a {
  color: var(--text);
  text-decoration: none;
  font-weight: 650;
}

.learn-sidebar__head p {
  margin: var(--space-1) 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.sidebar-module {
  margin-bottom: var(--space-2);
}

.sidebar-module__summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.55rem var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.sidebar-module__summary::-webkit-details-marker {
  display: none;
}

.sidebar-module__summary:hover {
  background: var(--surface-2);
  color: var(--text);
}

.sidebar-module__summary svg {
  width: 14px;
  height: 14px;
  flex: none;
  transition: transform 0.15s ease;
}

.sidebar-module[open] .sidebar-module__summary svg {
  transform: rotate(90deg);
}

.sidebar-module__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--space-3);
}

.sidebar-lesson {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: 0.45rem var(--space-3);
  border-left: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
  line-height: 1.4;
}

.sidebar-lesson:hover {
  color: var(--text);
  border-left-color: var(--muted-2);
}

.sidebar-lesson[aria-current='page'] {
  color: #fff;
  border-left-color: var(--red);
  background: rgba(224, 36, 36, 0.08);
}

.sidebar-lesson--locked {
  opacity: 0.45;
}

.sidebar-lesson svg {
  width: 13px;
  height: 13px;
  flex: none;
  margin-top: 0.2rem;
}

.learn-main {
  min-width: 0;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: var(--space-4);
  color: var(--muted);
  font-size: 0.8rem;
}

.breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--text);
}

.breadcrumbs svg {
  width: 12px;
  height: 12px;
}

.lesson-header {
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-5);
}

.lesson-header h1 {
  margin-bottom: var(--space-3);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  color: var(--muted);
  font-size: 0.82rem;
}

.lesson-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.lesson-meta svg {
  width: 14px;
  height: 14px;
}

.objectives {
  margin: var(--space-5) 0;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.objectives h2 {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-3);
}

.objectives ul {
  margin: 0;
  padding-left: 1.2rem;
}

.objectives li {
  color: var(--text);
  font-size: 0.92rem;
}

.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
}

.lesson-nav a {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
}

.lesson-nav a:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.lesson-nav span {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-nav strong {
  font-size: 0.95rem;
}

.lesson-nav a:last-child {
  text-align: right;
  align-items: flex-end;
}

@media (max-width: 980px) {
  .learn-shell {
    grid-template-columns: 1fr;
    width: min(100% - 1.5rem, 900px);
  }

  .learn-sidebar {
    position: static;
    max-height: none;
    order: 2;
    border-top: 1px solid var(--border);
    padding-top: var(--space-4);
  }
}

/* --------------------------------------------------------------------------
   Progress
   -------------------------------------------------------------------------- */

.progress {
  display: grid;
  gap: 0.4rem;
}

.progress__bar {
  height: 8px;
  background: var(--surface-3);
  border-radius: 999px;
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--red-dark), var(--red-bright));
  border-radius: inherit;
  transition: width 0.3s ease;
}

.progress__label {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--muted);
  font-size: 0.78rem;
}

.progress-ring {
  --size: 110px;
  display: grid;
  place-items: center;
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background:
    radial-gradient(closest-side, var(--surface) 76%, transparent 77%),
    conic-gradient(var(--red) calc(var(--progress, 0) * 1%), var(--surface-3) 0);
}

.progress-ring strong {
  font-size: 1.3rem;
}

/* --------------------------------------------------------------------------
   Lesson content (MDX)
   -------------------------------------------------------------------------- */

.prose {
  max-width: var(--reading-width);
  color: #d1d5db;
  font-size: 1.02rem;
  line-height: 1.78;
}

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

.prose h2 {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  font-size: clamp(1.35rem, 2vw, 1.75rem);
}

.prose h3 {
  margin-top: var(--space-6);
  font-size: 1.18rem;
}

.prose h4 {
  margin-top: var(--space-5);
  font-size: 1rem;
  letter-spacing: 0;
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-5);
}

.prose li {
  margin-bottom: var(--space-2);
}

.prose code {
  padding: 0.12em 0.36em;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: #fca5a5;
  font-family: var(--font-mono);
  font-size: 0.86em;
  word-break: break-word;
}

.prose pre {
  position: relative;
  margin: var(--space-5) 0;
  padding: var(--space-4);
  overflow-x: auto;
  background: var(--bg-deep);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: 0.84rem;
  line-height: 1.65;
  tab-size: 2;
}

.prose pre code {
  padding: 0;
  background: none;
  border: 0;
  color: #d1d5db;
  font-size: inherit;
  word-break: normal;
}

.code-block {
  position: relative;
}

.copy-code {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  z-index: 2;
  min-height: 30px;
  padding: 0.2rem 0.55rem;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  color: var(--muted);
  font: inherit;
  font-size: 0.72rem;
  cursor: pointer;
}

.copy-code:hover {
  color: #fff;
  border-color: var(--muted-2);
}

.prose blockquote {
  padding: var(--space-4) var(--space-5);
  border-left: 3px solid var(--red);
  background: var(--surface);
  color: var(--muted);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.prose .content-table {
  margin: var(--space-5) 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.prose hr {
  margin: var(--space-6) 0;
}

.diagram-wrap {
  margin: var(--space-5) 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-deep);
  overflow: hidden;
}

.diagram {
  margin: 0;
  padding: var(--space-4);
  overflow-x: auto;
  color: #cbd5e1;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.45;
  tab-size: 2;
}

.diagram:focus-visible {
  outline: 2px solid var(--red-bright);
  outline-offset: -2px;
}

/* --------------------------------------------------------------------------
   Checkpoints and assessments
   -------------------------------------------------------------------------- */

.quiz {
  margin-top: var(--space-6);
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.quiz__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.quiz__head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.quiz__question {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
}

.quiz__question:first-of-type {
  border-top: 0;
}

.quiz__question legend,
.quiz__question h3 {
  margin-bottom: var(--space-3);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
}

.quiz__options {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  border: 0;
}

.quiz__option {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
}

.quiz__option:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.quiz__option input {
  margin-top: 0.2rem;
  accent-color: var(--red);
}

.quiz__option:has(input:checked) {
  border-color: var(--red);
  background: rgba(224, 36, 36, 0.08);
}

.quiz__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
}

.quiz__feedback {
  margin-top: var(--space-4);
}

.feedback-item {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

.feedback-item:first-child {
  border-top: 0;
}

.feedback-item strong {
  display: block;
  margin-bottom: 0.2rem;
}

.feedback-item--correct strong {
  color: var(--success);
}

.feedback-item--wrong strong {
  color: var(--danger);
}

.result-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
}

.result-banner--pass {
  border-color: rgba(52, 211, 153, 0.4);
  background: var(--success-bg);
}

.result-banner--fail {
  border-color: rgba(248, 113, 113, 0.4);
  background: var(--danger-bg);
}

.result-banner strong {
  font-size: 1.4rem;
}

/* --------------------------------------------------------------------------
   Dashboard
   -------------------------------------------------------------------------- */

.dashboard-head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: var(--space-5);
  align-items: start;
}

@media (max-width: 900px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.continue-card {
  position: relative;
  overflow: hidden;
  padding: var(--space-6);
  background:
    radial-gradient(circle at 100% 0%, rgba(224, 36, 36, 0.16), transparent 55%),
    var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.continue-card h2 {
  margin-bottom: var(--space-2);
}

.continue-card p {
  color: var(--muted);
}

.module-progress-list {
  display: grid;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
  margin: 0;
}

.module-progress-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.module-progress-item__number {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.module-progress-item--done .module-progress-item__number {
  border-color: rgba(52, 211, 153, 0.4);
  background: var(--success-bg);
  color: var(--success);
}

.module-progress-item--locked {
  opacity: 0.55;
}

.module-progress-item h3 {
  margin: 0;
  font-size: 0.92rem;
}

.module-progress-item p {
  margin: 0.1rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

/* --------------------------------------------------------------------------
   Misc
   -------------------------------------------------------------------------- */

.page-hero {
  padding-block: var(--space-8) var(--space-6);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-deep), var(--bg));
}

.page-hero h1 {
  max-width: 20ch;
}

.page-hero p {
  max-width: 68ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.empty-state {
  padding: var(--space-7);
  text-align: center;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--muted);
}

.empty-state svg {
  width: 36px;
  height: 36px;
  margin: 0 auto var(--space-3);
  color: var(--muted-2);
}

.locked-panel {
  max-width: 640px;
  margin: var(--space-8) auto;
  padding: var(--space-6);
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.locked-panel svg {
  width: 42px;
  height: 42px;
  margin: 0 auto var(--space-4);
  color: var(--warning);
}

.locked-panel h1 {
  font-size: 1.6rem;
}

.locked-panel p {
  color: var(--muted);
}

.locked-panel .btn {
  margin-top: var(--space-3);
}

.notice {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.86rem;
}

.notice--warning {
  border-color: rgba(251, 191, 36, 0.35);
  background: var(--warning-bg);
  color: #fde68a;
}

.notice--danger {
  border-color: rgba(248, 113, 113, 0.35);
  background: var(--danger-bg);
  color: #fecaca;
}

.draft-banner {
  padding: var(--space-2) var(--space-4);
  background: var(--warning-bg);
  border-bottom: 1px solid rgba(251, 191, 36, 0.3);
  color: #fde68a;
  font-size: 0.8rem;
  text-align: center;
}

.faq {
  display: grid;
  gap: var(--space-3);
  max-width: 860px;
}

.faq details {
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq details p {
  margin: var(--space-3) 0 0;
  color: var(--muted);
}

.author-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: start;
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.author-card__avatar {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--red-bright);
  font-size: 1.4rem;
  font-weight: 700;
}

@media (max-width: 560px) {
  .author-card {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Header avatar, sidebar extras
   -------------------------------------------------------------------------- */

.header-avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-strong);
}

.header-avatar--text {
  display: inline-grid;
  place-items: center;
  background: var(--surface-3);
  color: var(--red-bright);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0;
}

.sidebar-search {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.sidebar-search .input {
  min-height: 36px;
  padding: 0.35rem 0.55rem;
  font-size: 0.8rem;
}

.sidebar-search .btn {
  flex: none;
  min-width: 40px;
}

.sidebar-final {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

.sidebar-module__summary .badge {
  margin-left: auto;
  padding: 0.1rem 0.4rem;
  font-size: 0.6rem;
  letter-spacing: 0;
}

/* --------------------------------------------------------------------------
   Reading progress and table of contents
   -------------------------------------------------------------------------- */

.reading-progress {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 45;
  height: 3px;
  background: transparent;
  pointer-events: none;
}

.reading-progress__fill {
  height: 100%;
  width: var(--reading, 0%);
  background: linear-gradient(90deg, var(--red-dark), var(--red-bright));
  transition: width 0.1s linear;
}

.lesson-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: var(--space-6);
  align-items: start;
}

.lesson-toc {
  position: sticky;
  top: calc(var(--header-height) + var(--space-5));
  max-height: calc(100vh - var(--header-height) - var(--space-6));
  overflow-y: auto;
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  scrollbar-width: thin;
}

.lesson-toc h2 {
  margin-bottom: var(--space-3);
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lesson-toc__list {
  display: grid;
  gap: 0.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-toc__list a {
  display: block;
  padding: 0.28rem 0.4rem;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.35;
}

.lesson-toc__list a:hover {
  color: var(--text);
}

.lesson-toc__list a[aria-current='true'] {
  border-left-color: var(--red);
  background: rgba(224, 36, 36, 0.08);
  color: #fff;
}

.lesson-toc__list .toc-depth-3 a {
  padding-left: 1.1rem;
  font-size: 0.76rem;
}

@media (max-width: 1100px) {
  .lesson-layout {
    grid-template-columns: 1fr;
  }

  .lesson-toc {
    position: static;
    order: -1;
    max-height: 40vh;
  }
}

/* --------------------------------------------------------------------------
   Course and module presentation
   -------------------------------------------------------------------------- */

.course-hero {
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle at 90% 0%, rgba(224, 36, 36, 0.14), transparent 55%),
    var(--bg-deep);
}

.course-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  gap: var(--space-6);
  align-items: start;
}

.course-hero h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.course-hero__subtitle {
  color: #d1d5db;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  font-weight: 500;
}

.course-hero__panel {
  padding: var(--space-5);
  background: rgba(17, 24, 39, 0.85);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.course-hero__panel h2 {
  font-size: 1rem;
}

.course-meta {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.course-meta li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  color: var(--muted);
  font-size: 0.86rem;
}

.course-meta svg {
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 0.15rem;
  color: var(--red-bright);
}

.price--lg strong {
  font-size: 2rem;
}

.price--lg del {
  font-size: 1.2rem;
}

.module-card {
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.module-card--locked {
  opacity: 0.65;
}

.module-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.module-card__head h3 {
  margin: 0;
  font-size: 1.05rem;
}

.module-card__head p {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.module-card__lessons {
  display: grid;
  gap: 0.35rem;
  margin: var(--space-4) 0 0;
  padding: var(--space-4) 0 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.module-card__lessons li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.4;
}

.module-card__lessons svg {
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 0.18rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

@media (max-width: 720px) {
  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .course-hero__grid {
    grid-template-columns: 1fr;
  }
}

.course-card__media {
  margin: calc(var(--space-5) * -1) calc(var(--space-5) * -1) var(--space-4);
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
  border-bottom: 1px solid var(--border);
}

.course-card__media img {
  width: 100%;
  height: 190px;
  object-fit: cover;
}

.course-card__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   Auth, search, account, assignment
   -------------------------------------------------------------------------- */

.auth-shell {
  display: grid;
  place-items: center;
  min-height: calc(100vh - var(--header-height) - 120px);
  padding: var(--space-7) var(--space-4);
}

.auth-card {
  width: min(100%, 470px);
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.auth-card h1 {
  font-size: 1.65rem;
}

.auth-card > p {
  color: var(--muted);
}

.auth-card .btn {
  width: 100%;
}

.auth-note {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  color: var(--muted-2);
  font-size: 0.8rem;
}

.auth-note a {
  color: var(--muted);
}

.search-results {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}

.search-result {
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.search-result h2 {
  margin-bottom: 0.2rem;
  font-size: 1rem;
}

.search-result h2 a {
  color: var(--text);
  text-decoration: none;
}

.search-result h2 a:hover {
  color: var(--red-bright);
}

.search-result p {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.search-result__meta {
  color: var(--muted-2);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.account-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: var(--space-5);
  align-items: start;
}

.avatar-lg {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-strong);
}

.avatar-lg--text {
  display: grid;
  place-items: center;
  background: var(--surface-3);
  color: var(--red-bright);
  font-size: 1.2rem;
  font-weight: 700;
}

.danger-zone {
  border-color: rgba(248, 113, 113, 0.35);
}

.danger-zone h2 {
  color: var(--danger);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.page-narrow {
  width: min(100% - 2.5rem, 820px);
  margin-inline: auto;
}

.legal {
  max-width: 78ch;
}

.legal h2 {
  margin-top: var(--space-7);
}

.legal h3 {
  margin-top: var(--space-5);
}

.legal p,
.legal li {
  color: var(--muted);
  font-size: 0.95rem;
}

.legal ul {
  padding-left: 1.3rem;
}

.assignment {
  max-width: 80ch;
}

.assignment h1 {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
}

.assignment h3 {
  margin-top: var(--space-6);
}

.assignment blockquote {
  margin: var(--space-5) 0;
  padding: var(--space-4) var(--space-5);
  border-left: 3px solid var(--red);
  background: var(--surface);
  color: var(--muted);
}

.assignment blockquote p:last-child {
  margin-bottom: 0;
}

.assignment hr {
  margin: var(--space-6) 0;
}

.cta-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  background:
    radial-gradient(circle at 100% 0%, rgba(224, 36, 36, 0.16), transparent 55%),
    var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.cta-band h2 {
  margin: 0 0 var(--space-1);
}

.cta-band p {
  margin: 0;
  color: var(--muted);
}

.checkpoint-passed {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid rgba(52, 211, 153, 0.4);
  border-radius: var(--radius-sm);
  background: var(--success-bg);
  color: #a7f3d0;
  font-size: 0.9rem;
}

.checkpoint-passed svg {
  flex: none;
  width: 18px;
  height: 18px;
}

.lesson-header__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.source-pages {
  color: var(--muted-2);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .account-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Motion and print
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .learn-sidebar,
  .lesson-nav,
  .quiz,
  .copy-code {
    display: none !important;
  }

  body {
    background: #fff;
    color: #111;
  }

  .learn-shell {
    display: block;
    width: 100%;
  }

  .prose {
    max-width: none;
  }
}