:root {
  /* Logo palette: sky blue + black + dark grey */
  --logo-blue: #42b6f5;
  --logo-blue-dark: #2a9ad4;
  --logo-blue-light: #6bc5f8;
  --logo-grey: #2a2a2a;
  --bg-deep: #000000;
  --bg-card: #0a0a0a;
  --bg-elevated: #141414;
  --accent: var(--logo-blue);
  --accent-dim: var(--logo-blue-dark);
  --accent-glow: rgba(66, 182, 245, 0.3);
  --accent-soft: rgba(66, 182, 245, 0.1);
  --accent-soft-strong: rgba(66, 182, 245, 0.14);
  --accent-border: rgba(66, 182, 245, 0.35);
  --accent-border-soft: rgba(66, 182, 245, 0.25);
  --cyan: var(--logo-blue);
  --text: #f0f4f8;
  --text-muted: #8ba3b8;
  --border: rgba(66, 182, 245, 0.12);
  --font: "Outfit", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --radius: 12px;
  --radius-lg: 20px;
  --header-h: 50px;
  --transition: 0.25s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  width: min(1140px, 92vw);
  margin-inline: auto;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(66, 182, 245, 0.08);
  transition: box-shadow var(--transition), background var(--transition);
}

.header.scrolled {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 1.05rem;
}

.logo-img {
  height: 36px;
  width: auto;
  max-width: min(220px, 48vw);
  object-fit: contain;
  display: block;
}

.logo-img-footer {
  height: 44px;
  max-width: 260px;
}

.hero-logo {
  width: auto;
  max-width: min(380px, 70vw);
  max-height: 280px;
  object-fit: contain;
  margin: 0 auto 1.75rem;
  display: block;
  filter: drop-shadow(0 0 32px rgba(66, 182, 245, 0.35));
}

.logo-fallback {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-fallback[hidden] {
  display: none !important;
}

.logo-icon {
  color: var(--accent);
  font-size: 1.25rem;
}

.logo strong {
  color: var(--accent);
  font-weight: 600;
}

.nav {
  display: flex;
  gap: 0.2rem;
  align-items: center;
}

.nav-link {
  padding: 0.35rem 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 999px;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.nav-link:hover {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: rgba(66, 182, 245, 0.18);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(66, 182, 245, 0.1);
  border-color: rgba(66, 182, 245, 0.3);
  box-shadow: 0 0 10px rgba(66, 182, 245, 0.15);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--header-h);
  padding-bottom: 4rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(66, 182, 245, 0.1), transparent),
    linear-gradient(180deg, var(--bg-deep) 0%, #050505 100%);
  pointer-events: none;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(180deg, black 0%, transparent 70%);
  opacity: 0.4;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 3rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  max-width: 20ch;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 52ch;
  margin-bottom: 2rem;
  text-align: center;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-deep);
}

.btn-primary:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-alt {
  background: var(--bg-card);
}

.section-header {
  margin-bottom: 3rem;
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 600;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.about-text strong {
  color: var(--text);
}

.about-list {
  list-style: none;
  margin-top: 1.5rem;
}

.about-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

.about-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.about-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.value-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
}

.value-card:hover {
  border-color: var(--accent-border);
}

.value-icon {
  font-size: 1.5rem;
  display: block;
  margin-bottom: 0.5rem;
}

.value-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.value-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-border-soft);
}

.service-card.featured {
  border-color: var(--accent-border);
  background: linear-gradient(160deg, var(--bg-elevated) 0%, var(--bg-deep) 100%);
  box-shadow: 0 0 40px var(--accent-glow);
}

.service-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.service-card h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.service-card > p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.service-card ul {
  list-style: none;
}

.service-card li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.35rem 0;
  padding-left: 1.25rem;
  position: relative;
}

.service-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateY(-50%);
}

/* Courses */
.courses-intro {
  color: var(--text-muted);
  max-width: 60ch;
  margin: -1.5rem 0 2.5rem;
  font-size: 1.05rem;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-border-soft);
}

.course-card.featured {
  border-color: var(--accent-border);
  background: linear-gradient(160deg, var(--bg-elevated) 0%, var(--bg-card) 100%);
}

.course-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-soft-strong);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  width: fit-content;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.course-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.65rem;
}

.course-card > p {
  color: var(--text-muted);
  font-size: 0.95rem;
  flex: 1;
  margin-bottom: 1.25rem;
}

.course-meta {
  list-style: none;
  margin-bottom: 1.25rem;
}

.course-meta li {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.2rem 0;
}

.btn-sm {
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  width: fit-content;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text);
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
}

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

.contact-block {
  margin-bottom: 1.75rem;
}

.contact-block h3 {
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.contact-block a {
  color: var(--text);
  text-decoration: none;
  font-size: 1.1rem;
}

.contact-block a:hover {
  color: var(--accent);
}

.contact-block p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.contact-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.7;
  margin-top: 2rem;
}

/* Footer */
.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.footer-brand .logo-icon {
  color: var(--accent);
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-nav a:hover {
  color: var(--accent);
}

.footer-copy {
  width: 100%;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* Responsive */
@media (max-width: 900px) {
  .about-grid,
  .services-grid,
  .courses-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-card);
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 1rem;
    text-align: center;
  }
}

@media (max-width: 600px) {
  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}