:root {
  --bg-primary: #0b0f1f;
  --bg-secondary: #151b34;
  --accent: #ff4f5a;
  --accent-light: #ff8b7d;
  --text-primary: #f5f7ff;
  --text-muted: rgba(245, 247, 255, 0.7);
  --card-bg: rgba(21, 27, 52, 0.7);
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-color: rgba(11, 15, 31, 0.6);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 0% 0%, #1c2447, #070b16);
  color: var(--text-primary);
  font-family: "Roboto", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

img,
iframe {
  max-width: 100%;
}

a {
  color: var(--accent-light);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  background: linear-gradient(135deg, rgba(11, 15, 31, 0.8), rgba(21, 27, 52, 0.6));
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
  padding: 2.2rem 0 1.8rem;
  width: min(900px, 90vw);
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  font-family: "Montserrat", sans-serif;
  font-size: 0.9rem;
}

.quick-links a {
  color: var(--text-primary);
  padding-bottom: 0.2rem;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.quick-links a:hover,
.quick-links a:focus {
  border-color: var(--accent);
  color: var(--accent-light);
}

.section {
  padding: clamp(4rem, 8vw, 6rem) 0;
}

.section-intro h2,
.section h2 {
  font-family: "Montserrat", sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-top: 0;
  margin-bottom: 1rem;
}

.section--how-to {
  background: linear-gradient(135deg, rgba(21, 27, 52, 0.82), rgba(11, 15, 31, 0.92));
}

.how-to-card {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
  background: rgba(11, 15, 31, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1.5rem;
  padding: clamp(1.8rem, 4vw, 3rem);
  box-shadow: 0 24px 60px rgba(5, 7, 16, 0.6);
}

.how-to-content p {
  color: var(--text-muted);
  font-size: clamp(0.95rem, 2.4vw, 1.1rem);
  max-width: 480px;
}

.how-to-controls h3 {
  font-family: "Montserrat", sans-serif;
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  margin-top: 0;
  margin-bottom: 1.2rem;
}

.control-table {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.control-table__row {
  display: grid;
  grid-template-columns: minmax(70px, 100px) 1fr;
  gap: 1.2rem;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  background: rgba(21, 27, 52, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.control-table__key {
  font-family: "Montserrat", sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  text-align: center;
  padding: 0.4rem 0.6rem;
  border-radius: 0.75rem;
  background: rgba(255, 79, 90, 0.25);
  box-shadow: inset 0 0 0 1px rgba(255, 79, 90, 0.45);
}

.control-table__action {
  margin: 0;
  font-size: 1rem;
  color: var(--text-muted);
}

@media (min-width: 720px) {
  .how-to-card {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.section--play .section-intro {
  margin: clamp(1.6rem, 4vw, 2.6rem) auto 0;
  text-align: center;
  display: grid;
  justify-items: center;
  gap: 0.75rem;
  max-width: min(680px, 100%);
}

.section-intro p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  margin-left: auto;
  margin-right: auto;
  max-width: 520px;
}

.section--play .section-intro h2 {
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  margin-bottom: 0.75rem;
}

.section--play .section-intro p {
  font-size: clamp(0.95rem, 2.3vw, 1.15rem);
  margin-bottom: 0.9rem;
  max-width: 420px;
}

.section--play .section-intro .btn {
  margin-top: 0.3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.7rem;
  border-radius: 999px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--text-primary);
  box-shadow: 0 14px 24px rgba(255, 79, 90, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover,
.btn:focus {
  transform: translateY(-2px);
  box-shadow: 0 18px 28px rgba(255, 79, 90, 0.45);
}

.tip-landscape {
  display: none;
  margin: 1.5rem 0;
  padding: 0.75rem 1.1rem;
  border-radius: 0.75rem;
  background: rgba(255, 79, 90, 0.15);
  color: var(--accent-light);
  border: 1px solid rgba(255, 79, 90, 0.35);
  font-weight: 500;
  text-align: center;
}

.tip-landscape[hidden] {
  display: none !important;
}

.section--play .container {
  width: min(1400px, 96vw);
}

.stage {
  background: linear-gradient(145deg, rgba(21, 27, 52, 0.88), rgba(11, 15, 31, 0.95));
  border-radius: 1.5rem;
  box-shadow: 0 30px 70px rgba(5, 7, 16, 0.7);
  padding: clamp(1rem, 2vw, 1.6rem);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1.2rem, 3vw, 1.8rem);
  width: 100%;
}

.frame-wrap {
  position: relative;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  width: min(1450px, 98vw);
  height: clamp(420px, 82vh, 940px);
  margin: 0 auto;
}

.frame {
  width: 100%;
  height: 100%;
  border: none;
  background: #05070f;
}

.touch-controls {
  width: min(520px, 100%);
  display: none;
  align-items: stretch;
  justify-content: space-between;
  gap: clamp(0.85rem, 2.5vw, 1.2rem);
  padding: clamp(0.65rem, 2vw, 1rem);
  border-radius: 1.1rem;
  background: rgba(5, 8, 17, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 18px 40px rgba(5, 7, 16, 0.6);
  backdrop-filter: blur(14px);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  z-index: 3;
}

.touch-controls:not([hidden]) {
  display: flex;
}

.touch-controls__cluster {
  display: flex;
  gap: clamp(0.6rem, 2vw, 1rem);
  flex: 1;
}

.touch-controls__cluster--direction {
  justify-content: flex-start;
}

.touch-controls__cluster--actions {
  justify-content: flex-end;
  align-items: stretch;
  flex-wrap: wrap;
  row-gap: clamp(0.5rem, 2vw, 0.8rem);
  max-width: min(55%, 240px);
}

.touch-controls__button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(15, 20, 36, 0.82);
  color: var(--text-primary);
  border-radius: 1rem;
  padding: clamp(0.75rem, 2vw, 1rem);
  min-width: clamp(64px, 18vw, 84px);
  min-height: clamp(64px, 18vw, 84px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  font-family: "Montserrat", sans-serif;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06), 0 18px 32px rgba(3, 5, 12, 0.65);
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
}

.touch-controls__button:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.8);
  outline-offset: 3px;
}

.touch-controls__button--primary {
  flex: 1 0 clamp(100px, 28vw, 140px);
  min-height: clamp(72px, 22vw, 108px);
  background: linear-gradient(135deg, rgba(255, 79, 90, 0.9), rgba(255, 139, 125, 0.9));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12), 0 22px 44px rgba(255, 79, 90, 0.35);
}

.touch-controls__button--secondary {
  flex: 1 0 clamp(88px, 24vw, 120px);
}

.touch-controls__glyph {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1;
}

.touch-controls__label {
  font-size: clamp(0.65rem, 2.6vw, 0.85rem);
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.touch-controls__button.is-active,
.touch-controls__button:active {
  transform: translateY(2px);
  background: linear-gradient(150deg, rgba(255, 79, 90, 0.65), rgba(15, 20, 36, 0.85));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.14), 0 10px 20px rgba(3, 5, 12, 0.7);
}

.play-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 1rem;
  padding: 0;
  border: none;
  background: linear-gradient(160deg, rgba(11, 15, 31, 0.9), rgba(5, 7, 16, 0.85));
  color: inherit;
  cursor: pointer;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 2;
}

.play-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.08), transparent 55%);
  pointer-events: none;
}

.play-overlay__icon {
  display: inline-grid;
  place-items: center;
  width: clamp(90px, 18vw, 140px);
  height: clamp(90px, 18vw, 140px);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--text-primary);
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  box-shadow: 0 20px 40px rgba(255, 79, 90, 0.35);
}

.play-overlay__label {
  position: absolute;
  left: 50%;
  bottom: clamp(1.6rem, 4vw, 2.4rem);
  transform: translateX(-50%);
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  background: rgba(11, 15, 31, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.16);
  font-family: "Montserrat", sans-serif;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.play-overlay:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.8);
  outline-offset: 6px;
}

.play-overlay.hidden {
  opacity: 0;
  transform: scale(0.98);
  pointer-events: none;
  visibility: hidden;
}

.play-hint {
  position: absolute;
  left: clamp(1rem, 2.5vw, 1.8rem);
  bottom: clamp(1rem, 2.5vw, 1.8rem);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.85rem;
  background: rgba(11, 15, 31, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 16px 28px rgba(5, 7, 16, 0.55);
  font-size: 0.95rem;
  line-height: 1.4;
  max-width: min(320px, 70%);
  color: var(--text-muted);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.play-hint__text {
  margin: 0;
}

.play-hint__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.2rem;
  box-shadow: 0 12px 20px rgba(255, 79, 90, 0.35);
}

.play-hint.hidden {
  opacity: 0;
  transform: translateY(6px);
}

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, rgba(11, 15, 31, 0.85), rgba(21, 27, 52, 0.9));
  transition: opacity 0.3s ease;
}

.loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 54px;
  height: 54px;
  border: 4px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--accent-light);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.section--story .story-card {
  background: var(--card-bg);
  border-radius: 1.5rem;
  border: 1px solid var(--border-color);
  padding: clamp(2rem, 4vw, 3rem);
  box-shadow: 0 30px 70px var(--shadow-color);
  backdrop-filter: blur(16px);
}

.story-card p {
  color: var(--text-muted);
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature {
  padding: 1.4rem;
  border-radius: 1rem;
  background: rgba(11, 15, 31, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.feature h3 {
  font-family: "Montserrat", sans-serif;
  margin-top: 0;
  margin-bottom: 0.6rem;
}

.feature p {
  margin: 0;
  color: var(--text-muted);
}

.section--controls {
  background: linear-gradient(160deg, rgba(11, 15, 31, 0.9), rgba(12, 25, 55, 0.85));
}

.controls-grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.control-list,
.tips-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.control-list li,
.tips-list li {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--text-muted);
}

.key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-weight: 600;
  font-family: "Montserrat", sans-serif;
}

.section--faq .faq {
  display: grid;
  gap: 1.6rem;
  margin-top: 2.5rem;
}

.faq-item {
  padding: 1.5rem 1.8rem;
  border-radius: 1.2rem;
  background: rgba(11, 15, 31, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 40px rgba(4, 6, 12, 0.6);
}

.faq-item h3 {
  margin-top: 0;
  margin-bottom: 0.7rem;
  font-family: "Montserrat", sans-serif;
}

.faq-item p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

.site-footer {
  margin-top: auto;
  padding: 3rem 0;
  background: rgba(5, 7, 15, 0.9);
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.site-footer .footer-links {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  margin: 1rem 0 0;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .site-header .container {
    padding: 2rem 0 1.5rem;
  }

  .quick-links {
    width: 100%;
    justify-content: center;
  }

  .section {
    padding: 3.5rem 0;
  }

  .btn {
    width: 100%;
  }

  .stage {
    padding: clamp(0.9rem, 2.8vw, 1.2rem);
    border-radius: 1.25rem;
  }

  .frame-wrap {
    border-radius: 0.9rem;
  }
}

@media (max-width: 600px) {
  .tip-landscape:not([hidden]) {
    display: block;
  }

  .frame-wrap {
    width: min(100%, 94vw);
    height: clamp(280px, 60vh, 640px);
  }

  .touch-controls__cluster {
    gap: 0.75rem;
  }

  .touch-controls__button {
    min-width: clamp(58px, 22vw, 76px);
    min-height: clamp(58px, 22vw, 76px);
  }

  .touch-controls__button--primary {
    min-height: clamp(68px, 26vw, 96px);
  }

  .touch-controls__cluster--actions {
    max-width: 100%;
    justify-content: center;
  }
}

@media (hover: none) and (max-width: 1024px) {
  .touch-controls:not([hidden]) {
    display: flex;
  }

  .play-hint {
    bottom: clamp(3.6rem, 12vw, 4.8rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.quick-links a.is-active {
  border-color: var(--accent);
  color: var(--accent-light);
}

.page-shell {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-hero {
  padding: clamp(3rem, 6vw, 4.5rem) 0 1rem;
  text-align: center;
}

.page-hero .container {
  display: grid;
  gap: 0.75rem;
  justify-items: center;
  max-width: 760px;
}

.page-hero h1 {
  font-family: "Montserrat", sans-serif;
  font-size: clamp(2.1rem, 5vw, 2.9rem);
  margin: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-lead {
  color: var(--text-muted);
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  margin: 0;
}

.snake-collection {
  padding: 0 0 clamp(4rem, 8vw, 5rem);
}

.snake-grid {
  display: grid;
  gap: clamp(1rem, 3vw, 1.5rem);
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.snake-card {
  background: rgba(11, 15, 31, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 14px 40px rgba(5, 7, 16, 0.6);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  display: flex;
  flex-direction: column;
}

.snake-card:hover,
.snake-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(255, 79, 90, 0.25);
  box-shadow: 0 18px 48px rgba(5, 7, 16, 0.7);
}

.snake-card img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.snake-card__content {
  padding: 1rem 1.1rem 1.2rem;
  display: grid;
  gap: 0.35rem;
}

.snake-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.snake-card__meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

@media (min-width: 900px) {
  .page-hero {
    padding-bottom: 2rem;
  }
}