:root {
  --font-display: "Unbounded", system-ui, sans-serif;
  --font-body: "Literata", "Times New Roman", serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --radius: 18px;
  --max: 42rem;
  --pad: clamp(1.25rem, 4vw, 2.5rem);
}

/* —— Светлая тема —— */
html[data-version="light"] {
  --bg: #f3efe4;
  --bg-deep: #e7e0d0;
  --ink: #1c2a24;
  --ink-soft: #3d4f46;
  --muted: #5f7168;
  --accent: #0f7a6a;
  --accent-soft: rgba(15, 122, 106, 0.12);
  --warm: #c45c26;
  --card: rgba(255, 252, 245, 0.72);
  --card-border: rgba(28, 42, 36, 0.1);
  --slot-bg: linear-gradient(145deg, #fffaf0 0%, #e8f2ee 100%);
  --slot-ink: #2a3d36;
  --glow-a: rgba(196, 92, 38, 0.18);
  --glow-b: rgba(15, 122, 106, 0.16);
  --topbar: rgba(243, 239, 228, 0.82);
  --shadow: 0 18px 50px rgba(28, 42, 36, 0.08);
  color-scheme: light;
}

/* —— Тёмная тема —— */
html[data-version="dark"] {
  --bg: #0d1218;
  --bg-deep: #070a0e;
  --ink: #d7e0e8;
  --ink-soft: #a8b6c2;
  --muted: #7d8d9b;
  --accent: #6eb8c9;
  --accent-soft: rgba(110, 184, 201, 0.12);
  --warm: #c47a5a;
  --card: rgba(18, 24, 32, 0.78);
  --card-border: rgba(215, 224, 232, 0.1);
  --slot-bg: linear-gradient(145deg, #141b24 0%, #0f1a22 55%, #152028 100%);
  --slot-ink: #b7c6d2;
  --glow-a: rgba(80, 120, 160, 0.14);
  --glow-b: rgba(20, 40, 60, 0.5);
  --topbar: rgba(13, 18, 24, 0.86);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 0.98rem + 0.35vw, 1.2rem);
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  transition: background-color 0.55s var(--ease), color 0.45s var(--ease);
}

body.is-switching .story,
body.is-switching .hero__eyebrow,
body.is-switching .hero__lead,
body.is-switching .coda {
  opacity: 0;
  transform: translateY(8px);
}

.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 50% at 15% 10%, var(--glow-a), transparent 55%),
    radial-gradient(ellipse 60% 45% at 90% 20%, var(--glow-b), transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  transition: opacity 0.55s var(--ease);
}

html[data-version="light"] .atmosphere {
  background-image:
    radial-gradient(ellipse 70% 50% at 15% 10%, var(--glow-a), transparent 55%),
    radial-gradient(ellipse 60% 45% at 90% 20%, var(--glow-b), transparent 50%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 28px,
      rgba(28, 42, 36, 0.015) 28px,
      rgba(28, 42, 36, 0.015) 29px
    ),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
}

html[data-version="dark"] .atmosphere {
  background-image:
    radial-gradient(ellipse 55% 40% at 70% 0%, rgba(110, 184, 201, 0.08), transparent 55%),
    radial-gradient(ellipse 50% 45% at 10% 80%, rgba(40, 60, 90, 0.35), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem 1.25rem;
  padding: 0.9rem var(--pad);
  background: var(--topbar);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--card-border);
  transition: background-color 0.55s var(--ease), border-color 0.55s var(--ease);
}

.topbar__mark {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.version-switch {
  display: inline-flex;
  padding: 0.28rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  box-shadow: var(--shadow);
}

.version-switch__btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  transition: background 0.35s var(--ease), color 0.35s var(--ease), transform 0.25s var(--ease);
}

.version-switch__btn:hover {
  color: var(--ink);
}

.version-switch__btn.is-active {
  color: var(--bg);
  background: var(--ink);
}

html[data-version="dark"] .version-switch__btn.is-active {
  color: #0d1218;
  background: var(--accent);
}

.version-switch__btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main {
  width: min(100%, calc(var(--max) + 8rem));
  margin: 0 auto;
  padding: 0 var(--pad) 4rem;
}

.hero {
  padding: clamp(2.5rem, 8vw, 5.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  max-width: var(--max);
  animation: rise 0.8s var(--ease) both;
}

.hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), color 0.45s var(--ease);
}

.hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 1.4rem + 4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero__lead {
  margin: 0;
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: 1.08em;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

.story {
  max-width: var(--max);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

.story[hidden] {
  display: none !important;
}

.story__kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--warm);
}

.story__subtitle {
  margin: 0 0 1.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.1rem + 1.2vw, 1.85rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.story h3 {
  margin: 2.25rem 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.story p {
  margin: 0 0 1.15rem;
  color: var(--ink-soft);
}

.story p strong,
.story li strong {
  color: var(--ink);
  font-weight: 600;
}

.story ul {
  margin: 0 0 1.35rem;
  padding-left: 1.15rem;
  color: var(--ink-soft);
}

.story li {
  margin-bottom: 0.55rem;
}

.story__closing {
  margin-top: 1.75rem;
  padding: 1.25rem 1.35rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.story-figure {
  margin: 2rem 0;
}

.story-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  background: var(--bg-deep);
}

.story-figure figcaption {
  margin-top: 0.65rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--muted);
  line-height: 1.45;
}

.coda {
  max-width: var(--max);
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding: clamp(1.5rem, 4vw, 2rem);
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--card-border);
  background: var(--card);
  box-shadow: var(--shadow);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), background 0.55s var(--ease), border-color 0.55s var(--ease);
}

.coda__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.coda p {
  margin: 0 0 0.9rem;
  color: var(--ink-soft);
}

.coda p strong {
  color: var(--ink);
}

.coda__last {
  margin-bottom: 0 !important;
  font-style: italic;
}

.site-footer {
  padding: 1.5rem var(--pad) 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 560px) {
  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .version-switch {
    width: 100%;
  }

  .version-switch__btn {
    flex: 1;
  }

  .version-switch {
    display: flex;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}