html {
  scroll-behavior: smooth;
}

:root {
  color-scheme: dark;

  --bg: #121212;
  --surface: rgba(24, 24, 24, 0.2);
  --surface-soft: #1e1e1e;
  --surface-card: #1c1c1c;

  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-hover: rgba(255, 255, 255, 0.12);

  --accent: #39c7b9;
  --accent-dim: rgba(57, 199, 185, 0.08);
  --accent-glow: rgba(57, 199, 185, 0.15);

  --text: #f0ebe0;
  --muted: #8a8580;

  --shadow-card: 0 22px 55px rgba(0, 0, 0, 0.45);
  --shadow-hover: 0 26px 60px rgba(0, 0, 0, 0.55), 0 0 40px rgba(255, 255, 255, 0.15);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
}

#particles-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.container {
  position: relative;
  z-index: 1;
  width: min(100%, 720px);
  padding: 36px 24px;
  text-align: center;
}

header {
  margin-bottom: 1.2rem;
}

header h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: 0.05em;
  transition:
    color 0.3s ease,
    text-shadow 0.3s ease;
}

header h1:hover {
  color: var(--accent);
  text-shadow: 0 0 28px var(--accent-glow);
}

header p {
  margin: 0.5rem auto 0;
  max-width: 34rem;
  color: var(--muted);
  transition:
    color 0.3s ease,
    text-shadow 0.3s ease;
}

header p:hover {
  color: var(--accent);
  text-shadow: 0 0 28px var(--accent-glow);
}

.fade-in {
  opacity: 0;
  transform: translateY(1rem);
  animation: fadeIn 0.7s ease forwards;
}

.fade-in-delay {
  animation-delay: 0.2s;
}

@keyframes fadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.cursor-blink {
  display: inline-block;
  color: var(--accent);
  animation: blinkCursor 0.9s steps(1) infinite;
}

@keyframes blinkCursor {
  0%,
  40% {
    opacity: 1;
  }

  41%,
  100% {
    opacity: 0;
  }
}

.main-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow-card);
  transition:
    border-color 0.4s ease,
    box-shadow 0.4s ease,
    transform 0.3s ease;
}

.main-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  transform: scale(1.005);
}

.card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 22px 24px;
  margin-top: 18px;
  text-align: left;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
  transition:
    border-color 0.4s ease,
    box-shadow 0.4s ease,
    transform 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.6s ease forwards;
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  transform: scale(1.01) translateY(-1px);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.card-header h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.card-content {
  max-height: 100%;
  opacity: 1;
  margin-top: 0;
}

.card-content ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.card-content ul li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.card-content ul li .desc {
  color: var(--muted);
  font-size: 0.95rem;
}

.card-content p {
  margin: 0.55rem 0;
  line-height: 1.7;
}

#card-rules ol {
  margin: 0;
  padding: 0 0 0 1.4rem;
  list-style: decimal;
  list-style-position: inside;
}

#card-rules ol li {
  color: var(--text);
  margin-bottom: 0.7rem;
}

#card-rules ol li::marker {
  color: var(--accent);
}

.avatar {
  position: relative;
  width: min(200px, 45vw);
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  object-fit: cover;
  margin: -90px auto 10px;
  border: 2px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.24);
  transition:
    transform 0.35s ease,
    box-shadow 0.35s ease;
}

.avatar:hover {
  transform: scale(1.04);
  box-shadow: 0 26px 56px var(--accent-dim);
}

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

a:hover {
  color: #e8e8e8;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--text);
}

.footer-note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

#back-to-top {
  position: fixed;
  bottom: 26px;
  right: 26px;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #ffffff;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.85);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    background 0.25s ease,
    box-shadow 0.25s ease;
  z-index: 1000;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.22);
}

#back-to-top.visible {
  opacity: 1;
  transform: scale(1);
}

#back-to-top:hover {
  background: #2bb8a8;
  box-shadow: 0 16px 40px var(--accent-dim);
}

::selection {
  background: var(--accent);
  color: #ffffff;
}

.card:nth-child(1) {
  animation-delay: 0.1s;
}

.card:nth-child(2) {
  animation-delay: 0.2s;
}

.card:nth-child(3) {
  animation-delay: 0.3s;
}

.card:nth-child(4) {
  animation-delay: 0.4s;
}

#card-rules {
  animation-delay: 0.4s;
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  .container {
    padding: 24px 18px;
  }

  .main-card {
    padding: 22px 18px;
  }

  .card {
    padding: 18px;
    margin-top: 14px;
  }

  .card-content ul li {
    flex-direction: column;
    align-items: flex-start;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 38px;
    height: 38px;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: clamp(1.6rem, 7vw, 2.4rem);
  }

  .card-header h2 {
    font-size: 1rem;
  }

  .footer-links {
    flex-direction: column;
    gap: 0.6rem;
  }

  .avatar {
    opacity: 0;
    transform: scale(0.9);
    transition:
      opacity 0.66s ease,
      transform 0.66s ease;
  }

  .avatar.loaded {
    opacity: 1;
    transform: scale(1);
  }
}