* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--canvas);
  color: var(--text-main);
  font-family: var(--font-arabic);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
}

.nav-shell {
  width: min(1180px, calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.nav-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 8px;
}


.brand {
  justify-self: start;
  color: var(--text-main);
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
}

.main-nav a {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--text-main);
}

.nav-cta {
  padding: 8px 14px;
  border: 1px solid var(--text-main);
  border-radius: 7px;
  background: var(--text-main);
  color: var(--accent-contrast);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

main {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  min-height: 560px;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
  align-items: center;
  gap: 72px;
  padding: 88px 0 72px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 800;
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(38px, 5.5vw, 70px);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.hero-text {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 9px 17px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

.button.secondary {
  border: 1px solid var(--border-strong);
  background: var(--surface);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  margin-top: 44px;
  border-top: 1px solid var(--border);
}

.stat {
  min-width: 145px;
  padding: 18px 22px 0 0;
}

.stat + .stat {
  margin-inline-start: 22px;
  padding-inline-start: 22px;
  border-inline-start: 1px solid var(--border);
}

.stat strong,
.stat span {
  display: block;
}

.stat strong {
  margin-bottom: 2px;
  font-size: 15px;
}

.stat span {
  color: var(--text-muted);
  font-size: 12px;
}

.hero-code {
  overflow: hidden;
  direction: ltr;
  border: 1px solid #29292d;
  border-radius: 10px;
  background: var(--surface-code);
  box-shadow: 0 24px 70px rgba(17, 17, 19, 0.13);
}

.code-topbar {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 15px;
  border-bottom: 1px solid #29292d;
  background: var(--terminal-header);
  color: var(--terminal-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.code-status { color: var(--terminal-success); }

.hero-code pre {
  min-height: 300px;
  margin: 0;
  padding: 28px 24px;
  color: var(--terminal-text);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.8;
  text-align: left;
  white-space: pre-wrap;
}

.courses-section {
  padding: 82px 0;
  border-top: 1px solid var(--border);
}

.section-heading {
  display: block;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.18;
}

.section-heading > p {
  max-width: 680px;
  margin: 12px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.course-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  min-height: 255px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  
}

.course-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 24px;
  direction: ltr;
}

.runtime-badge {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--python-soft);
  color: var(--python-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  direction: ltr;
  unicode-bidi: isolate;
}

.lesson-count {
  color: var(--text-soft);
  font-size: 11px;
  direction: rtl;
  unicode-bidi: isolate;
  text-align: right;
}

.course-card h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.35;
}

.course-card p {
  margin: 12px 0 28px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.75;
}

.course-link {
  margin-top: auto;
  align-self: flex-start;
  padding: 8px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  background: var(--surface-subtle);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
}

.model-grid h3 {
  margin: 18px 0 8px;
  font-size: 18px;
}

.model-grid p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.75;
}

.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border-top: 1px solid var(--border);
}

.site-footer p {
  margin: 0;
  color: var(--text-muted);
  font-size: 12px;
}

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

  .main-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 42px;
    padding-top: 64px;
  }

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

@media (max-width: 620px) {
  .nav-shell,
  main,
  .site-footer {
    width: min(100% - 24px, 1180px);
  }

  .hero {
    min-height: 0;
    padding: 48px 0 54px;
  }

  .hero h1 {
    font-size: 39px;
  }

  .hero-text {
    font-size: 16px;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: 1fr;
  }

  .stat,
  .stat + .stat {
    margin: 0;
    padding: 13px 0;
    border-inline-start: 0;
    border-bottom: 1px solid var(--border);
  }

  .courses-section {
    padding: 58px 0;
  }

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

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 28px 0;
  }
}


.course-card.is-coming-soon {
  background: var(--surface-subtle);
}

.course-status {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  direction: rtl;
  unicode-bidi: isolate;
  text-align: right;
}

.course-coming-soon {
  margin-top: auto;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 700;
}