/* AlexSoftClub - main landing */
:root {
  --bg: #0c1016;
  --bg-elevated: #141b24;
  --bg-card: #1a2330;
  --border: #2a3544;
  --text: #e8edf4;
  --text-muted: #8b9cb3;
  --accent: #42b983;
  --accent-hover: #5fd49a;
  --accent-dim: rgba(66, 185, 131, 0.15);
  --te-accent: #5b8def;
  --te-dim: rgba(91, 141, 239, 0.15);
  --cyber-cyan: #00e5ff;
  --cyber-magenta: #ff3dce;
  --cyber-cyan-dim: rgba(0, 229, 255, 0.12);
  --cyber-magenta-dim: rgba(255, 61, 206, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --font-sans: "Inter", system-ui, "Segoe UI", sans-serif;
  --font-display: "Manrope", var(--font-sans);
  --header-h: 72px;
  --max-w: 1120px;
  --shadow-card: 0 6px 24px rgba(0, 0, 0, 0.22);
  --shadow-card-hover: 0 10px 32px rgba(0, 0, 0, 0.28);
  --panel-pad: 1.75rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-dim), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, var(--te-dim), transparent);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

.container {
  width: min(100% - 2rem, var(--max-w));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(12, 16, 22, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

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

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #2d8f65);
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: #fff;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-desktop a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

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

.nav-cta {
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #0c1016 !important;
  border-radius: 8px;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--accent-hover);
  color: #0c1016 !important;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.btn-telegram {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  background: #229ed9;
  color: #fff !important;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 10px;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 18px rgba(34, 158, 217, 0.45);
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
  flex-shrink: 0;
}

.btn-telegram:hover {
  background: #1a8bc4;
  color: #fff !important;
  box-shadow: 0 6px 24px rgba(34, 158, 217, 0.6);
  transform: translateY(-1px);
}

.btn-telegram-icon {
  display: block;
  flex-shrink: 0;
}

.btn-telegram--mobile {
  width: 100%;
  justify-content: center;
  margin-bottom: 0.25rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.25rem;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem 0 1.5rem;
  border-top: 1px solid var(--border);
}

.nav-mobile.is-open {
  display: flex;
}

.nav-mobile a {
  color: var(--text-muted);
  font-weight: 500;
}

/* Hero */
.hero {
  padding: 4rem 0 3.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  margin-bottom: 1.25rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(66, 185, 131, 0.35);
  border-radius: 999px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero-lead {
  font-size: clamp(1.05rem, 2.5vw, 1.2rem);
  color: var(--text-muted);
  max-width: 42rem;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.35rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s, border-color 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #0a0f14;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #0a0f14;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--text);
}

.btn-te {
  background: var(--te-accent);
  color: #fff;
}

.btn-te:hover {
  background: #6d9ef5;
  color: #fff;
  transform: translateY(-1px);
}

/* Layout rhythm */
main > .section {
  padding: 4rem 0;
}

main > .section:nth-of-type(even) {
  background: rgba(20, 27, 36, 0.45);
  border-block: 1px solid var(--border);
}

/* Products */
.section {
  padding: 4rem 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  text-align: center;
}

.section-desc {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.55;
  max-width: 36rem;
  margin: 0 auto 2rem;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--panel-pad);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.product-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.product-card--asc {
  border-color: rgba(66, 185, 131, 0.35);
}

.product-card--te {
  border-color: rgba(91, 141, 239, 0.35);
}

.product-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  width: fit-content;
}

.product-tag--asc {
  background: var(--accent-dim);
  color: var(--accent);
}

.product-tag--te {
  background: var(--te-dim);
  color: var(--te-accent);
}

.product-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0;
}

.product-shot {
  margin: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
  line-height: 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.product-shot img {
  display: block;
  width: 100%;
  height: auto;
}

.product-shot--te {
  border-color: rgba(91, 141, 239, 0.35);
}

.product-shot--asc {
  border-color: rgba(66, 185, 131, 0.35);
}

.product-lead {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.4;
}

.product-lead--te {
  color: var(--te-accent);
}

.product-card--te > p:not(.product-lead) {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.product-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  flex: 1;
}

.product-features {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.product-features li {
  padding: 0.35rem 0;
  padding-left: 1.25rem;
  position: relative;
}

.product-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.product-card--te .product-features li::before {
  background: var(--te-accent);
}

.product-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* Video lesson tiles */
.tiles-block {
  margin-bottom: 3rem;
}

.tiles-block:last-child {
  margin-bottom: 0;
}

.tiles-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.tiles-head h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0;
}

.tiles-head .tiles-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
}

.tiles-badge--te {
  background: var(--te-dim);
  color: var(--te-accent);
}

.tiles-badge--asc {
  background: var(--accent-dim);
  color: var(--accent);
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(188px, 1fr));
  gap: 0.75rem;
  align-items: start;
}

.tile {
  position: relative;
  aspect-ratio: unset;
  height: auto;
  min-height: 132px;
  display: flex;
  flex-direction: column;
  padding: 0.75rem 0.65rem 0.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
  overflow: visible;
  min-width: 0;
}

a.tile:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.tile--te:hover {
  border-color: var(--te-accent);
}

.tile--asc:hover {
  border-color: var(--accent);
}

.tile--static {
  cursor: default;
  opacity: 0.85;
  aspect-ratio: unset;
  height: auto;
  min-height: 172px;
}

.tile--static:hover {
  transform: none;
  box-shadow: none;
}

.tile-num {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1;
  margin: 0 0 0.35rem;
  flex-shrink: 0;
  opacity: 0.35;
}

.tile--te .tile-num {
  color: var(--te-accent);
  opacity: 0.7;
}

.tile--asc .tile-num {
  color: var(--accent);
  opacity: 0.7;
}

.tile-title {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1.22;
  margin: 0;
  flex: 0 1 auto;
  overflow: visible;
  display: block;
  word-break: break-word;
  hyphens: auto;
}

.tile-desc {
  margin: 0;
  font-size: 0.68rem;
  line-height: 1.3;
  color: var(--text-muted);
  flex: 0 1 auto;
  overflow: visible;
  display: block;
  word-break: break-word;
}

.tile-action {
  margin-top: auto;
  padding-top: 0.35rem;
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.2;
  flex-shrink: 0;
}

.tile--te .tile-action {
  color: var(--te-accent);
}

.tile--asc .tile-action {
  color: var(--accent);
}

.tile-links {
  margin-top: auto;
  padding-top: 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.65rem;
  font-weight: 600;
}

.tile-links a {
  color: var(--accent);
}

.tile-soon {
  margin-top: auto;
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Video lessons - cyber two-sided timeline (AlexSoftClub) */
@keyframes cyber-pulse {
  0%,
  100% {
    box-shadow:
      0 0 0 4px var(--bg),
      0 0 12px rgba(0, 229, 255, 0.35),
      0 0 24px rgba(255, 61, 206, 0.2);
  }
  50% {
    box-shadow:
      0 0 0 4px var(--bg),
      0 0 20px rgba(0, 229, 255, 0.55),
      0 0 32px rgba(255, 61, 206, 0.35);
  }
}

@keyframes cyber-scan {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(100%);
  }
}

.tiles-block--cyber {
  position: relative;
  margin-top: 0.5rem;
  padding: 2rem 1.5rem 2.25rem;
  border: 1px solid rgba(0, 229, 255, 0.22);
  border-radius: var(--radius-lg);
  background-color: rgba(10, 14, 22, 0.85);
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.04) 1px, transparent 1px),
    radial-gradient(ellipse 70% 45% at 50% 0%, var(--cyber-cyan-dim), transparent 55%),
    radial-gradient(ellipse 50% 35% at 100% 100%, var(--cyber-magenta-dim), transparent 50%);
  background-size: 28px 28px, 28px 28px, auto, auto;
  overflow: hidden;
  box-shadow:
    inset 0 0 60px rgba(0, 229, 255, 0.04),
    0 0 40px rgba(0, 0, 0, 0.35);
}

.tiles-block--cyber::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(0, 229, 255, 0.03) 50%,
    transparent 100%
  );
  animation: cyber-scan 8s linear infinite;
  pointer-events: none;
  opacity: 0.6;
}

.tiles-block--cyber::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--cyber-cyan),
    var(--accent),
    var(--cyber-magenta),
    transparent
  );
  opacity: 0.85;
  pointer-events: none;
}

.tiles-block--cyber .tiles-head {
  position: relative;
  z-index: 1;
  justify-content: center;
  text-align: center;
  margin-bottom: 1.75rem;
}

.tiles-block--cyber .tiles-head h3 {
  width: 100%;
  text-shadow: 0 0 18px rgba(0, 229, 255, 0.35);
}

.tiles-block--cyber .tiles-badge--asc {
  background: linear-gradient(135deg, var(--cyber-cyan-dim), var(--cyber-magenta-dim));
  color: var(--cyber-cyan);
  border: 1px solid rgba(0, 229, 255, 0.35);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.15);
}

/* TelegramEngine - cyber matrix grid (not staircase) */
.tiles-block--cyber-te {
  border-color: rgba(91, 141, 239, 0.28);
  background-image:
    linear-gradient(rgba(91, 141, 239, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 141, 239, 0.05) 1px, transparent 1px),
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(91, 141, 239, 0.14), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 100%, var(--cyber-magenta-dim), transparent 50%);
  box-shadow:
    inset 0 0 80px rgba(91, 141, 239, 0.06),
    0 0 40px rgba(0, 0, 0, 0.35);
}

.tiles-block--cyber-te::after {
  background: linear-gradient(
    90deg,
    transparent,
    var(--te-accent),
    var(--cyber-cyan),
    var(--cyber-magenta),
    transparent
  );
}

.tiles-block--cyber-te .tiles-head h3 {
  text-shadow: 0 0 20px rgba(91, 141, 239, 0.45);
}

.tiles-block--cyber-te .tiles-badge--te {
  background: linear-gradient(135deg, var(--te-dim), var(--cyber-magenta-dim));
  color: var(--te-accent);
  border: 1px solid rgba(91, 141, 239, 0.45);
  box-shadow: 0 0 14px rgba(91, 141, 239, 0.2);
}

.te-matrix {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.te-matrix-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  min-height: 148px;
  padding: 1.1rem 1.15rem 1rem;
  text-decoration: none;
  color: inherit;
  background: linear-gradient(
    155deg,
    rgba(22, 32, 52, 0.95) 0%,
    rgba(12, 16, 24, 0.98) 100%
  );
  border: 1px solid rgba(91, 141, 239, 0.28);
  clip-path: polygon(
    0 0,
    calc(100% - 10px) 0,
    100% 10px,
    100% 100%,
    10px 100%,
    0 calc(100% - 10px)
  );
  box-shadow:
    0 4px 20px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(91, 141, 239, 0.12);
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.te-matrix-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--te-accent), transparent);
  opacity: 0.9;
}

.te-matrix-card:nth-child(3n + 2) {
  transform: translateY(0.65rem);
}

.te-matrix-card:nth-child(3n) {
  border-color: rgba(255, 61, 206, 0.22);
}

.te-matrix-card:nth-child(3n)::before {
  background: linear-gradient(90deg, var(--cyber-magenta), transparent);
}

.te-matrix-card:hover {
  border-color: rgba(91, 141, 239, 0.55);
  transform: translateY(-4px);
  box-shadow:
    0 10px 32px rgba(0, 0, 0, 0.38),
    0 0 28px rgba(91, 141, 239, 0.18),
    0 0 36px rgba(255, 61, 206, 0.06);
}

.te-matrix-card:nth-child(3n + 2):hover {
  transform: translateY(calc(0.65rem - 4px));
}

.te-matrix-card:nth-child(3n):hover {
  border-color: rgba(255, 61, 206, 0.45);
}

.te-matrix-card--featured {
  grid-column: 1 / -1;
  min-height: auto;
  padding: 1.35rem 1.5rem;
  border-color: rgba(0, 229, 255, 0.35);
  background: linear-gradient(
    120deg,
    rgba(30, 45, 72, 0.98) 0%,
    rgba(14, 20, 32, 0.98) 55%,
    rgba(40, 20, 48, 0.4) 100%
  );
}

.te-matrix-card--featured::before {
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--cyber-cyan),
    var(--te-accent),
    var(--cyber-magenta)
  );
}

.te-matrix-card--featured:hover {
  transform: translateY(-4px);
}

.te-matrix-card--featured .te-matrix-title {
  font-size: 1.15rem;
  max-width: 52rem;
}

.te-matrix-num {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--te-accent);
  opacity: 0.95;
}

.te-matrix-card:nth-child(3n) .te-matrix-num {
  color: var(--cyber-magenta);
}

.te-matrix-title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0;
  text-shadow: 0 0 16px rgba(91, 141, 239, 0.12);
}

.te-matrix-cta {
  align-self: flex-start;
  margin-top: 0.15rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--te-accent);
  background: rgba(91, 141, 239, 0.12);
  border: 1px solid rgba(91, 141, 239, 0.4);
  border-radius: 2px;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.te-matrix-card:nth-child(3n) .te-matrix-cta {
  color: var(--cyber-magenta);
  background: rgba(255, 61, 206, 0.1);
  border-color: rgba(255, 61, 206, 0.35);
}

.te-matrix-card:hover .te-matrix-cta {
  color: var(--bg);
  background: var(--te-accent);
  border-color: var(--te-accent);
  box-shadow: 0 0 16px rgba(91, 141, 239, 0.4);
}

.te-matrix-card:nth-child(3n):hover .te-matrix-cta {
  background: var(--cyber-magenta);
  border-color: var(--cyber-magenta);
  box-shadow: 0 0 16px rgba(255, 61, 206, 0.35);
}

.lesson-stairs--asc {
  list-style: none;
  margin: 0 auto;
  padding: 0.25rem 0 0;
  width: min(100%, 1040px);
  position: relative;
  z-index: 1;
}

.lesson-stairs--asc::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 3px;
  transform: translateX(-50%);
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--cyber-cyan) 8%,
    var(--accent) 45%,
    var(--cyber-magenta) 92%,
    transparent 100%
  );
  box-shadow:
    0 0 8px var(--cyber-cyan),
    0 0 16px var(--cyber-magenta);
  opacity: 0.75;
  pointer-events: none;
}

.lesson-stairs--asc .lesson-step {
  margin: 0;
  padding: 0 0 1.35rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 4.5rem minmax(0, 1fr);
  gap: 0 1.5rem;
  align-items: start;
  position: relative;
}

.lesson-stairs--asc .lesson-step:last-child {
  padding-bottom: 0;
}

.lesson-step-node {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  justify-content: center;
  padding-top: 1.35rem;
  position: relative;
  z-index: 2;
}

.lesson-step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1;
  color: var(--cyber-cyan);
  background: radial-gradient(circle at 30% 30%, var(--bg-elevated), var(--bg-card));
  border: 2px solid rgba(0, 229, 255, 0.55);
  border-radius: 50%;
  animation: cyber-pulse 3s ease-in-out infinite;
}

.lesson-step--module .lesson-step-num {
  font-size: 1.3rem;
  color: var(--text-muted);
  border-color: var(--border);
  animation: none;
  box-shadow: 0 0 0 4px var(--bg);
}

.lesson-stairs--asc .lesson-step-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  padding: 1.2rem 1.35rem;
  background: linear-gradient(
    145deg,
    rgba(20, 28, 40, 0.95) 0%,
    rgba(12, 16, 24, 0.98) 100%
  );
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 4px;
  clip-path: polygon(
    0 0,
    calc(100% - 12px) 0,
    100% 12px,
    100% 100%,
    12px 100%,
    0 calc(100% - 12px)
  );
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(0, 229, 255, 0.08);
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.lesson-stairs--asc .lesson-step-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyber-cyan), var(--accent));
  opacity: 0.85;
}

.lesson-stairs--asc .lesson-step:nth-child(odd) .lesson-step-card {
  grid-column: 1;
  justify-self: end;
}

.lesson-stairs--asc .lesson-step:nth-child(odd) .lesson-step-card::after {
  content: "";
  position: absolute;
  right: -1.5rem;
  top: 2.6rem;
  width: 1.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--cyber-cyan), transparent);
  box-shadow: 0 0 6px var(--cyber-cyan);
}

.lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-card {
  grid-column: 3;
  justify-self: start;
}

.lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-card::before {
  left: auto;
  right: 0;
  background: linear-gradient(180deg, var(--cyber-magenta), var(--accent));
}

.lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-card::after {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 2.6rem;
  width: 1.5rem;
  height: 2px;
  background: linear-gradient(270deg, var(--cyber-magenta), transparent);
  box-shadow: 0 0 6px var(--cyber-magenta);
}

.lesson-stairs--asc .lesson-step-card:hover {
  border-color: rgba(0, 229, 255, 0.45);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    0 0 24px rgba(0, 229, 255, 0.12),
    0 0 32px rgba(255, 61, 206, 0.08);
  transform: translateY(-3px);
}

.lesson-stairs--asc .lesson-step--soon .lesson-step-card,
.lesson-stairs--asc .lesson-step--module .lesson-step-card {
  border-style: dashed;
  border-color: rgba(139, 156, 179, 0.35);
  opacity: 0.9;
}

.lesson-stairs--asc .lesson-step--soon .lesson-step-card:hover,
.lesson-stairs--asc .lesson-step--module .lesson-step-card:hover {
  transform: none;
}

.lesson-step-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 0;
}

.lesson-step-title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0;
  color: var(--text);
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
}

.lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-title {
  text-shadow: 0 0 20px rgba(255, 61, 206, 0.12);
}

.lesson-step-desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.lesson-step-link {
  align-self: flex-start;
  margin-top: 0.25rem;
  padding: 0.5rem 1rem;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyber-cyan);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.4);
  border-radius: 2px;
  text-decoration: none;
  text-transform: uppercase;
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.1);
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-link {
  color: var(--cyber-magenta);
  background: rgba(255, 61, 206, 0.08);
  border-color: rgba(255, 61, 206, 0.4);
  box-shadow: 0 0 12px rgba(255, 61, 206, 0.1);
}

.lesson-step-link:hover {
  color: var(--bg);
  background: var(--cyber-cyan);
  border-color: var(--cyber-cyan);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.45);
  text-decoration: none;
}

.lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-link:hover {
  background: var(--cyber-magenta);
  border-color: var(--cyber-magenta);
  box-shadow: 0 0 20px rgba(255, 61, 206, 0.45);
}

.lesson-step-badge {
  align-self: flex-start;
  margin-top: 0.25rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.4rem 0.75rem;
  border-radius: 2px;
  background: rgba(139, 156, 179, 0.1);
  color: var(--text-muted);
  border: 1px dashed rgba(139, 156, 179, 0.45);
}

@media (prefers-reduced-motion: reduce) {
  .lesson-step-num,
  .tiles-block--cyber::before {
    animation: none;
  }

  .te-matrix-card:nth-child(3n + 2) {
    transform: none;
  }

  .te-matrix-card:nth-child(3n + 2):hover {
    transform: translateY(-4px);
  }
}

@media (max-width: 960px) {
  .te-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .te-matrix-card:nth-child(3n + 2) {
    transform: none;
  }

  .te-matrix-card:nth-child(3n + 2):hover {
    transform: translateY(-4px);
  }

  .lesson-stairs--asc::before {
    left: 1.625rem;
    transform: none;
  }

  .lesson-stairs--asc .lesson-step {
    grid-template-columns: 3.25rem 1fr;
    gap: 0 1rem;
  }

  .lesson-step-node {
    grid-column: 1;
    padding-top: 1rem;
  }

  .lesson-stairs--asc .lesson-step-card,
  .lesson-stairs--asc .lesson-step:nth-child(odd) .lesson-step-card,
  .lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-card {
    grid-column: 2;
    justify-self: stretch;
    max-width: none;
  }

  .lesson-stairs--asc .lesson-step:nth-child(odd) .lesson-step-card::after,
  .lesson-stairs--asc .lesson-step:nth-child(even) .lesson-step-card::after {
    display: none;
  }
}

/* What you get - prose block */
.section-benefits .section-desc {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
}

.benefits-prose {
  max-width: none;
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
}

.benefits-prose p,
.benefits-prose li {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
}

.benefits-prose p {
  margin: 0 0 0.85rem;
}

.benefits-prose ul {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
}

.benefits-prose li {
  margin-bottom: 0.5rem;
}

.benefits-prose li:last-child {
  margin-bottom: 0;
}

.benefits-prose .benefits-label {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.benefits-prose .benefits-footer-line {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* Requirements */
.requirements-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 640px;
  margin: 0 auto;
}

.requirements-box ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.requirements-box li {
  margin-bottom: 0.5rem;
}

.requirements-box li strong {
  color: var(--text);
}

/* Legal / terms */
.section-legal .container {
  max-width: 52rem;
}

.legal-doc {
  padding: 2rem 2.25rem;
  text-align: left;
  max-width: none;
  margin: 0;
}

.legal-doc-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
  color: var(--text);
}

.legal-doc-meta {
  margin: 0 0 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.legal-doc-note {
  margin: 0 0 1.5rem;
  padding: 1rem 1.15rem;
  background: rgba(0, 229, 255, 0.06);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: var(--radius-md);
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.55;
}

.legal-doc h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 1.75rem 0 0.75rem;
  color: var(--text);
}

.legal-doc p {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.legal-doc p strong {
  color: var(--text);
}

.legal-doc ul {
  margin: 0 0 0.85rem;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.legal-doc li {
  margin-bottom: 0.45rem;
}

.legal-doc a {
  color: var(--cyber-cyan, var(--te-accent));
}

.legal-doc a:hover {
  color: var(--accent);
}

.legal-doc-back {
  margin-top: 2rem !important;
}

.legal-doc-footer {
  margin-top: 1rem !important;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem !important;
  color: var(--text-muted) !important;
}

/* FAQ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
  background: var(--bg-elevated);
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--accent);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item .faq-answer {
  padding: 0 1.25rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  border-top: 1px solid var(--border);
  margin-top: 0;
  padding-top: 1rem;
}

.faq-item .faq-answer a {
  font-weight: 500;
}

/* Footer */
.site-footer {
  margin-top: 3rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

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

.footer-col li {
  margin-bottom: 0.4rem;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.social-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* Utilities */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }

  .header-right {
    gap: 0.65rem;
  }

  .btn-telegram-label {
    display: none;
  }

  .btn-telegram {
    padding: 0.55rem 0.7rem;
  }

  .menu-toggle {
    display: block;
  }

  .btn-telegram--mobile .btn-telegram-label {
    display: inline;
  }

  .hero {
    padding-top: 2.5rem;
  }

  .tile-grid {
    grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  }

  .tile-title {
    font-size: 0.72rem;
  }

  .tiles-block--cyber {
    padding: 1.25rem 1rem 1.5rem;
  }

  .te-matrix {
    grid-template-columns: 1fr;
  }

  .te-matrix-card--featured .te-matrix-title {
    font-size: 1.05rem;
  }

  .lesson-step-num {
    width: 2.75rem;
    height: 2.75rem;
    font-size: 1rem;
  }

  .lesson-step-title {
    font-size: 1rem;
  }

  .lesson-step-desc {
    font-size: 0.9rem;
  }
}