:root {
  --bg: #070b10;
  --surface: #101820;
  --elevated: #162230;
  --border: rgba(232, 238, 245, 0.08);
  --text: #e8eef5;
  --muted: #7a8fa3;
  --accent: #5b8fba;
  --accent-dim: #3d6a8c;
  --glow: rgba(91, 143, 186, 0.15);
  --radius: 14px;
  --font: "DM Sans", system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: 0 0;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
  pointer-events: none;
  z-index: 0;
  animation: grid-drift 80s linear infinite;
}

@keyframes grid-drift {
  to {
    background-position: 48px 48px;
  }
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem);
}

.header-top {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1rem;
}

.lang-switch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.lang-switch-label {
  margin-right: 0.35rem;
}

.lang-switch-label .biline-en {
  font-size: 0.72rem;
  opacity: 0.85;
  margin-top: 0.08rem;
}

.lang-btn {
  font: inherit;
  cursor: pointer;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  transition:
    background 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease,
    transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.25s ease;
}

.lang-btn:hover {
  color: var(--text);
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.lang-btn.is-active {
  background: var(--elevated);
  color: var(--accent);
  border-color: var(--accent-dim);
  box-shadow: 0 0 12px rgba(91, 143, 186, 0.2);
}

header {
  margin-bottom: 2.5rem;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 1rem;
  background: var(--glow);
  animation: badge-breathe 4s ease-in-out infinite;
}

@keyframes badge-breathe {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(91, 143, 186, 0.12);
    border-color: var(--border);
  }
  50% {
    box-shadow: 0 0 20px 1px rgba(91, 143, 186, 0.2);
    border-color: rgba(91, 143, 186, 0.35);
  }
}

/* Заголовок: «чернильное» пятно + блик по буквам */
.title-ink {
  position: relative;
  font-size: clamp(1.85rem, 4.5vw, 2.45rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
  line-height: 1.15;
  padding: 0.2rem 0;
}

.title-ink__blob {
  position: absolute;
  left: -8%;
  bottom: -5%;
  width: 118%;
  height: 95%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 65% at 25% 55%, rgba(25, 48, 72, 0.92) 0%, transparent 58%),
    radial-gradient(ellipse 45% 50% at 72% 38%, rgba(50, 95, 130, 0.55) 0%, transparent 55%),
    radial-gradient(ellipse 35% 40% at 55% 75%, rgba(35, 70, 100, 0.4) 0%, transparent 50%);
  filter: blur(14px);
  border-radius: 45% 55% 52% 48%;
  transform-origin: 15% 50%;
  opacity: 0;
  animation: ink-spread 1.35s cubic-bezier(0.2, 0.85, 0.25, 1) forwards;
}

@keyframes ink-spread {
  0% {
    transform: scaleX(0.12) scaleY(0.35);
    opacity: 0;
  }
  35% {
    opacity: 0.95;
  }
  100% {
    transform: scaleX(1) scaleY(1);
    opacity: 1;
  }
}

.title-ink__text {
  position: relative;
  z-index: 1;
  display: inline-block;
  background: linear-gradient(
    100deg,
    #c5d4e3 0%,
    #e8eef5 22%,
    #e8eef5 38%,
    #8ec4eb 48%,
    #e8eef5 58%,
    #e8eef5 78%,
    #a8c5de 100%
  );
  background-size: 220% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation:
    title-ink-reveal 1.05s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.15s both,
    title-shimmer 6s ease-in-out 1.1s infinite;
}

@keyframes title-ink-reveal {
  from {
    clip-path: inset(0 100% 0 0);
    filter: blur(6px);
    opacity: 0.3;
  }
  70% {
    filter: blur(0);
    opacity: 1;
  }
  to {
    clip-path: inset(0 0 0 0);
    filter: blur(0);
    opacity: 1;
  }
}

@keyframes title-shimmer {
  0%,
  100% {
    background-position: 100% center;
  }
  50% {
    background-position: 0% center;
  }
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 36rem;
  margin: 0;
  animation: lead-rise 0.85s ease 0.55s both;
}

@keyframes lead-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn > * {
  position: relative;
  z-index: 1;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.75rem 0 2.5rem;
}

.actions .btn-ghost {
  animation: action-pop 0.55s cubic-bezier(0.22, 1, 0.36, 1) 0.78s backwards;
}

/* Вход + затем мягкая пульсация свечения */
.actions .btn-primary {
  animation-name: action-pop, btn-primary-pulse;
  animation-duration: 0.55s, 3.5s;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1), ease-in-out;
  animation-delay: 0.62s, 1.2s;
  animation-fill-mode: backwards, none;
  animation-iteration-count: 1, infinite;
}

@keyframes action-pop {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.btn {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.65rem 1.15rem;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  overflow: hidden;
  isolation: isolate;
  transition:
    transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
    background 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.35s ease;
}

.btn::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(255, 255, 255, 0.12),
    transparent,
    rgba(91, 143, 186, 0.35),
    transparent
  );
  background-size: 300% 100%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  z-index: -1;
  animation: btn-border-flow 4s linear infinite;
  pointer-events: none;
}

.btn:hover::after {
  opacity: 1;
}

@keyframes btn-border-flow {
  0% {
    background-position: 100% 0;
  }
  100% {
    background-position: -100% 0;
  }
}

/* Блик при наведении */
.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -60%;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.22),
    transparent
  );
  transform: skewX(-18deg);
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.btn:hover::before {
  opacity: 1;
  animation: btn-sheen 0.75s ease forwards;
}

@keyframes btn-sheen {
  to {
    left: 120%;
  }
}

.btn:hover {
  transform: translateY(-3px);
}

.btn:active {
  transform: scale(0.97) translateY(0);
}

.btn-primary {
  background: linear-gradient(165deg, #6aa3cc 0%, var(--accent) 45%, #4a7aa3 100%);
  color: #061018;
  box-shadow: 0 4px 20px rgba(91, 143, 186, 0.25);
  animation: btn-primary-pulse 3.5s ease-in-out infinite;
}

.btn-primary:hover {
  background: linear-gradient(165deg, #7eb0d6 0%, #6fa3cc 50%, #5589b3 100%);
  box-shadow: 0 8px 32px rgba(91, 143, 186, 0.4);
}

@keyframes btn-primary-pulse {
  0%,
  100% {
    box-shadow: 0 4px 20px rgba(91, 143, 186, 0.22);
  }
  50% {
    box-shadow: 0 6px 28px rgba(91, 143, 186, 0.45);
  }
}

.btn-ghost {
  background: var(--elevated);
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: rgba(91, 143, 186, 0.45);
  background: var(--surface);
  box-shadow: 0 0 0 1px rgba(91, 143, 186, 0.12), 0 8px 24px rgba(0, 0, 0, 0.25);
}

.btn-ghost::after {
  animation-duration: 5s;
}

.section-block {
  margin-bottom: 2.25rem;
}

h2,
.section-title {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem;
}

.cards {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  transition:
    transform 0.4s cubic-bezier(0.34, 1.2, 0.64, 1),
    border-color 0.3s ease,
    box-shadow 0.4s ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(91, 143, 186, 0.22);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

#feature-cards .card {
  animation: card-rise 0.65s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

#feature-cards .card:nth-child(1) {
  animation-delay: 0.08s;
}

#feature-cards .card:nth-child(2) {
  animation-delay: 0.16s;
}

#feature-cards .card:nth-child(3) {
  animation-delay: 0.24s;
}

#feature-cards .card:nth-child(4) {
  animation-delay: 0.32s;
}

#feature-cards .card:nth-child(n + 5) {
  animation-delay: 0.4s;
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 600;
}

.card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.88rem;
}

.links-row a {
  color: var(--accent);
  text-decoration: none;
}

.links-row a:hover {
  text-decoration: underline;
}

.links-sep {
  opacity: 0.35;
  user-select: none;
}

/* Режим «Оба»: русская строка + английская ниже */
.biline {
  display: block;
}

.biline-en {
  font-size: 0.92em;
  opacity: 0.82;
  font-weight: 500;
  text-transform: none;
  letter-spacing: normal;
}

.lang-both .section-title .biline-en {
  margin-top: 0.35rem;
}

.lang-both .links-row a {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
}

.lang-both .links-row a .biline-en {
  font-size: 0.8rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
}

.variant-note {
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--elevated);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin-top: 2rem;
}

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

/* Доступность: без постоянной анимации */
@media (prefers-reduced-motion: reduce) {
  .bg-grid {
    animation: none;
  }

  .badge {
    animation: none;
  }

  .title-ink__blob {
    animation: none;
    opacity: 0.65;
    transform: none;
  }

  .title-ink__text {
    animation: none;
    color: var(--text);
    background: none;
    -webkit-text-fill-color: var(--text);
    clip-path: none;
    filter: none;
    opacity: 1;
  }

  .btn,
  .btn-primary,
  .lang-btn,
  .card,
  .actions .btn,
  .actions .btn-primary,
  #feature-cards .card {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }

  .btn::before,
  .btn::after {
    display: none;
  }

  .btn:hover,
  .card:hover,
  .lang-btn:hover {
    transform: none;
  }

  .lead {
    animation: none;
    opacity: 1;
  }
}