/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #0a0a0f;
  --color-surface: #12121a;
  --color-surface-hover: #1a1a25;
  --color-border: #2a2a3a;
  --color-text: #e8e8f0;
  --color-text-muted: #8888a0;
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-accent: #22d3ee;
  --color-accent-dim: rgba(34, 211, 238, 0.1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.logo-4 { color: var(--color-accent); }
.logo-coders { color: var(--color-text); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.lang-toggle {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}

.lang-toggle:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* === Hero === */
.hero {
  padding: 140px 0 80px;
  background: radial-gradient(ellipse at 30% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 100%, rgba(34, 211, 238, 0.05) 0%, transparent 60%);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero__tag {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.hero__title {
  font-size: clamp(2.25rem, 4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero__desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  max-width: 480px;
}

.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition);
  font-family: var(--font);
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}
.btn--primary:hover { background: var(--color-primary-light); transform: translateY(-1px); }

.btn--outline {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: transparent;
}
.btn--outline:hover { border-color: var(--color-text-muted); background: var(--color-surface); }

/* Code block visual */
.code-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.9375rem;
  line-height: 1.8;
  position: relative;
  overflow: hidden;
}

.code-block::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), rgba(34, 211, 238, 0.03));
  pointer-events: none;
}

.code-block__dots {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}
.code-block__dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
}
.code-block__dots span:first-child { background: #ff5f57; }
.code-block__dots span:nth-child(2) { background: #febc2e; }
.code-block__dots span:last-child { background: #28c840; }

.code-block .kw { color: var(--color-primary-light); }
.code-block .fn { color: var(--color-accent); }
.code-block .arg { color: #f59e0b; }

/* === Stats === */
.stats {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat__number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat__label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* === Sections Common === */
.section-tag {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 48px;
}

/* === About === */
.about { padding: 100px 0; }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about__text p {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  margin-bottom: 16px;
  line-height: 1.7;
}

.about__values {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.value-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.value-card:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-hover);
}

.value-card__icon { font-size: 1.5rem; margin-bottom: 8px; }
.value-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.value-card p { font-size: 0.875rem; color: var(--color-text-muted); }

/* === Programs === */
.programs {
  padding: 100px 0;
  background: var(--color-surface);
}

.programs__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.program-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.program-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.1);
}

.program-card--featured {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.05), var(--color-bg));
}

.program-card__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.program-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.program-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
  flex-grow: 1;
}

.program-card__features {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.program-card__features li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-left: 20px;
  position: relative;
}

.program-card__features li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary-light);
}

/* === Method === */
.method { padding: 100px 0; }

.method__steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.step {
  position: relative;
  padding: 32px 0 0;
}

.step::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
}

.step__number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-surface-hover);
  letter-spacing: -0.05em;
  line-height: 1;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* === Contact === */
.contact {
  padding: 100px 0;
  background: var(--color-surface);
  text-align: center;
}

.contact__desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin: -24px auto 40px;
  line-height: 1.7;
}

.contact__grid {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 28px;
  transition: all var(--transition);
  font-size: 0.9375rem;
}

.contact-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.contact-card__icon { font-size: 1.25rem; }

/* === Footer === */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer__brand p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.footer__copy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  width: 100%;
  text-align: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* === Responsive === */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__visual { order: -1; }
  .about__grid { grid-template-columns: 1fr; gap: 40px; }
  .programs__grid { grid-template-columns: 1fr; }
  .method__steps { grid-template-columns: repeat(2, 1fr); }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav__links { 
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
  }
  .nav__links.active { display: flex; }
  .nav__hamburger { display: flex; }
  .method__steps { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .hero { padding: 100px 0 60px; }
  .about, .programs, .method, .contact { padding: 64px 0; }
  .footer__inner { flex-direction: column; text-align: center; }
  .footer__links { justify-content: center; }
}

/* === Bootcamp (paused) === */
.bootcamp {
  padding: 80px 0;
}

.bootcamp__inner {
  text-align: center;
}

.bootcamp__content {
  max-width: 600px;
  margin: 0 auto;
}

.bootcamp__badge-paused {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.bootcamp__content p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.bootcamp__content .btn {
  margin-top: 8px;
}