:root {
  --bg-deep: #07131f;
  --bg-mid: #0d2030;
  --bg-soft: #132b3b;
  --cyan: #9edee2;
  --cyan-strong: #80cfd1;
  --cyan-muted: #5faeb2;
  --panel: rgba(54, 92, 101, 0.82);
  --panel-dark: rgba(8, 21, 34, 0.72);
  --border: #a6dce0;
  --shadow: rgba(0, 0, 0, 0.65);
  --text: #d7f5f6;
  --text-muted: #a4cfd1;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  background:
    radial-gradient(circle at top, rgba(28, 61, 82, 0.48), transparent 42rem),
    linear-gradient(135deg, var(--bg-deep), var(--bg-mid) 48%, #06101b);
  letter-spacing: 0.01em;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.025) 0,
    rgba(255, 255, 255, 0.025) 1px,
    transparent 1px,
    transparent 4px
  );
  opacity: 0.22;
  mix-blend-mode: screen;
}

.site-shell {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 8px 0 28px;
}

.site-header {
  padding-top: 4px;
}

.brand-strip {
  display: grid;
  grid-template-columns: minmax(64px, 120px) minmax(220px, 1fr) minmax(64px, 120px);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

.moon-link {
  justify-self: center;
  display: inline-flex;
}

.title-link {
  justify-self: center;
  display: inline-flex;
  max-width: 100%;
}

.moon-logo {
  width: clamp(64px, 8vw, 104px);
  aspect-ratio: 1;
  object-fit: contain;
  image-rendering: auto;
  filter: drop-shadow(0 3px 4px var(--shadow));
}

.site-logo {
  width: min(520px, 100%);
  height: auto;
  object-fit: contain;
  image-rendering: auto;
  filter: drop-shadow(0 5px 3px rgba(0, 0, 0, 0.8));
}

.header-rule {
  height: 2px;
  margin: 8px 0 16px;
  background: linear-gradient(90deg, transparent, var(--border) 5%, var(--border) 95%, transparent);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.18), 0 0 8px rgba(158, 222, 226, 0.28);
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(150px, 190px) minmax(280px, 1fr) minmax(220px, 260px);
  gap: clamp(18px, 2.5vw, 30px);
  align-items: start;
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-top: 16px;
}

.nav-button {
  display: block;
  padding: 12px 12px;
  color: var(--cyan);
  text-decoration: none;
  font-size: clamp(0.95rem, 1.3vw, 1.2rem);
  font-weight: 700;
  line-height: 1.2;
  text-shadow: 0 0 5px rgba(128, 207, 209, 0.25);
  background:
    linear-gradient(180deg, rgba(30, 61, 78, 0.78), rgba(7, 19, 31, 0.92)),
    var(--panel-dark);
  border: 2px solid rgba(166, 220, 224, 0.84);
  box-shadow:
    inset 1px 1px 0 rgba(255, 255, 255, 0.26),
    inset -2px -2px 0 rgba(0, 0, 0, 0.42),
    0 3px 0 rgba(0, 0, 0, 0.38),
    0 0 8px rgba(128, 207, 209, 0.08);
  transition: transform 120ms ease, color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.nav-button:hover,
.nav-button:focus-visible {
  color: #d9ffff;
  border-color: #d8fbff;
  background:
    linear-gradient(180deg, rgba(49, 88, 104, 0.9), rgba(11, 31, 48, 0.95)),
    var(--panel-dark);
  transform: translateY(-1px);
  outline: none;
}

.nav-button:active,
.nav-button.is-active {
  transform: translateY(2px);
  color: #ffffff;
  box-shadow:
    inset -1px -1px 0 rgba(255, 255, 255, 0.14),
    inset 3px 3px 0 rgba(0, 0, 0, 0.45),
    0 1px 0 rgba(0, 0, 0, 0.4);
}

.content-column {
  min-width: 0;
}

.page-title {
  margin: 0 0 12px;
  color: var(--cyan-strong);
  text-align: center;
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.6), 0 0 8px rgba(128, 207, 209, 0.28);
}

.old-panel {
  border: 2px solid rgba(166, 220, 224, 0.85);
  background:
    linear-gradient(180deg, rgba(68, 112, 122, 0.86), rgba(41, 81, 91, 0.88)),
    var(--panel);
  box-shadow:
    inset 2px 2px 0 rgba(255, 255, 255, 0.14),
    inset -3px -3px 0 rgba(0, 0, 0, 0.24),
    0 8px 18px rgba(0, 0, 0, 0.32);
}

.content-panel {
  min-height: 520px;
  padding: clamp(16px, 2.2vw, 24px);
}

.content-panel h2,
.author-panel h2,
.info-block h3,
.feature-box h3 {
  margin-top: 0;
  color: var(--cyan-strong);
}

.content-panel p,
.author-panel p,
.link-list {
  color: var(--text);
  line-height: 1.6;
}

code {
  color: #ffffff;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(166, 220, 224, 0.25);
  padding: 0.1rem 0.3rem;
}

.feature-box {
  margin-top: 24px;
  padding: 14px;
  background: rgba(4, 16, 27, 0.36);
  border: 1px solid rgba(166, 220, 224, 0.45);
  box-shadow: inset 1px 1px 0 rgba(255, 255, 255, 0.08);
}

.author-panel {
  min-height: 470px;
  padding: 18px 16px;
  background:
    linear-gradient(180deg, rgba(11, 31, 48, 0.92), rgba(5, 15, 27, 0.92)),
    var(--panel-dark);
}

.profile-card {
  text-align: center;
}

.profile-photo {
  width: min(72px, 75%);
  aspect-ratio: 1;
  object-fit: cover;
  margin: 0 auto 12px;
  display: block;
  border: 2px solid rgba(166, 220, 224, 0.72);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.45);
}

.info-block {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(166, 220, 224, 0.35);
}

a {
  color: var(--cyan);
}

a:hover,
a:focus-visible {
  color: #ffffff;
}

.link-list {
  margin: 0;
  padding-left: 18px;
}

@media (max-width: 860px) {
  .site-shell {
    width: min(100% - 22px, var(--max-width));
  }

  .brand-strip {
    grid-template-columns: 88px 1fr;
  }

  .brand-strip::after {
    content: none;
  }

  .page-grid {
    grid-template-columns: 1fr;
  }

  .side-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    padding-top: 0;
  }

  .content-panel,
  .author-panel {
    min-height: auto;
  }
}

@media (max-width: 540px) {
  .brand-strip {
    grid-template-columns: 64px 1fr;
    gap: 10px;
  }

  .side-nav {
    grid-template-columns: 1fr;
  }

  .nav-button {
    text-align: center;
  }

  .content-panel,
  .author-panel {
    padding: 14px;
  }
}