/* ==========================================================================
   Atlas — components & sections
   ========================================================================== */

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(6, 7, 8, 0.55);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid transparent;
  box-shadow: var(--glass-highlight);
  transition: background var(--duration-base) ease, border-color var(--duration-base) ease;
}
.header.scrolled { background: rgba(6, 7, 8, 0.7); border-color: var(--glass-border); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand { display: inline-flex; align-items: center; }

.brand-logo { height: 40px; width: auto; }

.brand-logo-round {
  height: 40px;
  width: 40px;
  object-fit: cover;
  border-radius: 9px;
  border: 1px solid var(--color-line);
}

.nav-links { display: flex; gap: 34px; }

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  position: relative;
  transition: color var(--duration-fast) ease;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 1px;
  background: var(--color-steel-100);
  transition: width var(--duration-base) var(--ease);
}
.nav-links a:hover { color: var(--color-text); }
.nav-links a:hover::after { width: 100%; }

.nav-cta { padding: 10px 20px; font-size: 13.5px; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}
.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--duration-slow) var(--ease), opacity var(--duration-fast) ease;
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 80vw);
  background: rgba(6, 7, 8, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--glass-border);
  padding: 110px 32px 32px;
  z-index: 99;
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu li { margin-bottom: var(--space-sm); }
.mobile-menu a {
  display: block;
  padding: var(--space-md) 16px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 500;
  transition: background var(--duration-fast) ease;
}
.mobile-menu a:hover { background: rgba(200, 210, 224, 0.06); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: var(--space-hero) 0 var(--space-section);
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  opacity: 0.5;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 72px;
  align-items: center;
  min-height: min(78vh, 760px);
  position: relative;
}

.hero-text { max-width: 600px; }

.hero h1 {
  font-size: clamp(44px, 6.2vw, 78px);
  letter-spacing: -0.02em;
  margin-bottom: 26px;
  font-weight: 700;
}

.hero-sub {
  color: var(--color-muted);
  font-size: 18px;
  max-width: 500px;
  margin-bottom: 40px;
}

.hero-actions { display: flex; gap: var(--space-lg); flex-wrap: wrap; }

/* Constellation — signature element */
.constellation { position: relative; }

.cursor-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 300px;
  height: 300px;
  margin: -150px 0 0 -150px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 210, 224, 0.1), transparent 60%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-base) ease;
  z-index: 1;
}
.hero:hover .cursor-glow { opacity: 1; }

.const-line {
  transition: stroke var(--duration-base) ease, opacity var(--duration-base) ease;
}
.const-line.hot {
  stroke: rgba(214, 221, 232, 0.75);
  stroke-width: 1.4;
}

.const-node {
  cursor: pointer;
  transition: transform var(--duration-base) var(--ease), opacity var(--duration-base) ease;
}
.const-node.hot {
  transform: scale(1.9);
  opacity: 1;
}

.const-glow {
  position: absolute;
  inset: -10% -8%;
  background: radial-gradient(circle at 68% 30%, rgba(200, 210, 224, 0.12), transparent 60%);
  pointer-events: none;
}

.constellation svg {
  width: 100%;
  height: auto;
  display: block;
}

.constellation .const-node {
  transform-origin: center;
  transform-box: fill-box;
  animation: const-pulse 3.2s ease-in-out infinite;
}
.constellation .const-node:nth-child(3) { animation-delay: 0.6s; }
.constellation .const-node:nth-child(2) { animation-delay: 1.3s; }
.constellation .const-node:nth-child(1) { animation-delay: 2s; }

@keyframes const-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.const-labels {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: 18px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-display);
  color: var(--color-steel-300);
}

/* ---------- Sections ---------- */
.section {
  padding: var(--space-section) 0;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: var(--color-bg);
  border-top: 1px solid var(--color-line);
}
.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-line-strong);
  border-bottom: 1px solid var(--color-line);
}

.section > .container {
  position: relative;
  z-index: 1;
}

.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(760px, 88%);
  height: 1px;
  background: var(--gradient-divider);
  pointer-events: none;
}

.section::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 9px;
  height: 9px;
  background: var(--gradient-dot);
  border-radius: 1.5px;
  box-shadow: 0 0 16px rgba(180, 195, 215, 0.6), 0 0 3px rgba(255, 255, 255, 0.25) inset;
  pointer-events: none;
}

.section-head { max-width: 640px; margin-bottom: 52px; }
.section-head h2 { font-size: clamp(30px, 4vw, 44px); letter-spacing: -0.01em; margin-bottom: var(--space-md); }
.section-head p:not(.eyebrow) { color: var(--color-muted); font-size: 16px; }

/* ---------- Courses ---------- */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.course {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: var(--space-xl) 28px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight), 0 24px 48px -32px rgba(0, 0, 0, 0.7);
  transition:
    border-color var(--duration-base) ease,
    background var(--duration-base) ease,
    transform var(--duration-base) var(--ease),
    box-shadow var(--duration-base) ease;
}
.course::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 15% 0%, rgba(214, 221, 232, 0.12), transparent 55%);
  pointer-events: none;
  opacity: 0.7;
  transition: opacity var(--duration-base) ease;
}
.course:hover {
  transform: translateY(-4px);
  border-color: var(--glass-border-strong);
  background: var(--glass-bg-strong);
  box-shadow: var(--glass-highlight), 0 32px 64px -32px rgba(0, 0, 0, 0.85);
}
.course:hover::before { opacity: 1; }

.course > *,
.plan > * { position: relative; z-index: 1; }

.course-meta { display: flex; justify-content: flex-end; margin-bottom: 26px; }

.course-level {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-steel-300);
  border: 1px solid var(--color-line);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

.course h3 { font-size: 21px; margin-bottom: var(--space-sm); }
.course p { color: var(--color-muted); font-size: 14.5px; margin-bottom: 24px; flex: 1; }

.course-skills { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: 20px; }
.course-skills li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--color-steel-300);
  background: rgba(200, 210, 224, 0.05);
  border: 1px solid var(--color-line);
  padding: 4px 10px;
  border-radius: var(--radius-btn);
}

.course-age { font-size: 12.5px; color: var(--color-steel-500); letter-spacing: 0.05em; }

/* ---------- Path map ---------- */
.map-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  position: relative;
}

.map-grid::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 4%;
  right: 4%;
  height: 1px;
  background: var(--gradient-divider);
  pointer-events: none;
}

.map-step { position: relative; }

.map-dot {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-line-strong);
  background: var(--color-bg);
  color: var(--color-steel-100);
  display: grid;
  place-items: center;
  font-size: 12px;
  margin-bottom: 18px;
  box-shadow: 0 0 0 6px var(--color-bg-alt), 0 0 18px rgba(180, 195, 215, 0.25);
}

.map-step h3 { font-size: 18px; margin-bottom: var(--space-sm); }
.map-step p { color: var(--color-muted); font-size: 14.5px; max-width: 240px; }

/* ---------- Why ---------- */
#approach { padding: 5rem 0; }

.why-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 40px;
}

.why-head h2 { font-size: clamp(28px, 3.8vw, 40px); letter-spacing: -0.01em; margin-bottom: 16px; }
.why-head p:not(.eyebrow) { color: var(--color-muted); font-size: 16px; max-width: 480px; }

.why-list { display: flex; flex-direction: column; }

#approach .why-item,
#results .why-item { padding: 16px 0; border-top: 1px solid var(--color-line); transition: padding var(--duration-base) var(--ease); }
#approach .why-item:last-child,
#results .why-item:last-child { border-bottom: 1px solid var(--color-line); }
#approach .why-item:hover,
#results .why-item:hover { padding-left: var(--space-sm); }

#approach .why-label,
#results .why-label { font-size: 12.5px; color: var(--color-steel-300); display: block; margin-bottom: 8px; }

#approach .why-item h3,
#results .why-item h3 { font-size: 17px; margin-bottom: 4px; }
#approach .why-item p,
#results .why-item p { color: var(--color-muted); font-size: 14px; max-width: 520px; }

/* ---------- Pricing ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: stretch;
}

.plan {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight), 0 24px 48px -32px rgba(0, 0, 0, 0.7);
}
.plan::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 15% 0%, rgba(214, 221, 232, 0.1), transparent 55%);
  pointer-events: none;
}

.plan-featured {
  border-color: var(--color-steel-300);
  background: var(--gradient-card);
}

.plan-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-steel-300);
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-btn);
  width: fit-content;
  margin-bottom: 26px;
}

.plan h3 { font-size: 18px; margin-bottom: 10px; }

.price {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}
.price span { font-size: 14px; color: var(--color-muted); font-weight: 500; }

.plan ul { margin-bottom: 28px; flex: 1; }
.plan li { position: relative; padding-left: 24px; margin-bottom: 12px; color: var(--color-muted); font-size: 14.5px; }
.plan li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-steel-300);
  font-family: var(--font-mono);
}

/* ---------- Contact ---------- */
.cta-inner {
  position: relative;
  text-align: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-banner);
  padding: 72px 40px;
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-highlight), 0 40px 80px -48px rgba(0, 0, 0, 0.8);
}

.cta-inner::before {
  content: '';
  position: absolute;
  inset: -40% -15% auto -15%;
  height: 90%;
  background: radial-gradient(ellipse at top, rgba(200, 210, 224, 0.08), transparent 65%);
  pointer-events: none;
}

.cta-inner > * { position: relative; }
.cta-inner h2 { font-size: clamp(30px, 4vw, 42px); letter-spacing: -0.01em; margin-bottom: 12px; }

.cta-note {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 36px;
  letter-spacing: 0.02em;
}

.cta-form { max-width: 440px; margin: 0 auto; display: grid; gap: var(--space-md); }

.cta-form input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: rgba(6, 7, 8, 0.45);
  color: var(--color-text);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: border-color var(--duration-fast) ease;
}
.cta-form input::placeholder { color: #5d6675; }
.cta-form input:focus { border-color: var(--color-steel-100); background: rgba(6, 7, 8, 0.6); }

.form-note { font-size: 13px; color: var(--color-steel-300); min-height: 20px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--color-line); padding: 34px 0; }

.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

.footer-tag { color: var(--color-muted); font-size: 12.5px; }

.footer-socials { display: flex; gap: var(--space-sm); }
.footer-socials a {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  border: 1px solid var(--color-line);
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--color-muted);
  transition: color var(--duration-fast) ease, border-color var(--duration-fast) ease, transform var(--duration-fast) ease;
}
.footer-socials a:hover { border-color: var(--color-steel-100); color: var(--color-text); transform: translateY(-2px); }

.footer-socials-icon { width: 18px; height: 18px; display: block; }