:root {
  --font-sans: 'Plus Jakarta Sans', 'Trebuchet MS', sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --bg-angle: 130deg;

  --surface: rgba(255, 255, 255, 0.06);
  --surface-soft: rgba(255, 255, 255, 0.03);
  --surface-strong: rgba(255, 255, 255, 0.1);
  --border: rgba(255, 255, 255, 0.16);
  --line: rgba(255, 255, 255, 0.12);
  --text-main: #ebf2ff;
  --text-muted: #b4c2dd;
  --text-dim: #7f93b4;

  --accent-1: #7fd1ff;
  --accent-2: #8dffc5;
  --accent-3: #8bb3ff;
  --accent-glow: 0 0 28px rgba(127, 209, 255, 0.35);

  --bg-1: #090c22;
  --bg-2: #0a1130;
  --bg-3: #060917;
  --bg-overlay-1: rgba(127, 209, 255, 0.14);
  --bg-overlay-2: rgba(141, 255, 197, 0.12);

  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --shadow-soft: 0 10px 35px rgba(0, 0, 0, 0.3);
}

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-main);
  font-family: var(--font-sans);
  background: linear-gradient(var(--bg-angle), var(--bg-1), var(--bg-2) 52%, var(--bg-3));
  background-attachment: fixed;
  overflow-x: hidden;
}

body::before,
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -3;
}

body::before {
  background:
    radial-gradient(circle at 78% 16%, var(--bg-overlay-1), transparent 42%),
    radial-gradient(circle at 14% 90%, var(--bg-overlay-2), transparent 48%);
  opacity: 1;
}

body::after {
  background:
    radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.04) 0 0.1%, transparent 55%),
    linear-gradient(transparent 0, rgba(0, 0, 0, 0.25) 82%);
  mix-blend-mode: screen;
  z-index: -2;
}

body.theme-aurora {
  --accent-1: #7fd1ff;
  --accent-2: #8dffc5;
  --accent-3: #8bb3ff;
  --bg-1: #070b1b;
  --bg-2: #0b1734;
  --bg-3: #050814;
  --bg-overlay-1: rgba(127, 209, 255, 0.18);
  --bg-overlay-2: rgba(141, 255, 197, 0.14);
}

body.theme-midnight {
  --accent-1: #78a7ff;
  --accent-2: #a3bbff;
  --accent-3: #95f0ff;
  --bg-1: #05070d;
  --bg-2: #090d19;
  --bg-3: #03060f;
  --bg-overlay-1: rgba(120, 167, 255, 0.16);
  --bg-overlay-2: rgba(149, 240, 255, 0.12);
  --text-main: #f4f7ff;
  --text-muted: #adbad6;
}

body.theme-volcano {
  --accent-1: #ff9f5a;
  --accent-2: #ffcc7d;
  --accent-3: #ff7ad9;
  --bg-1: #170c11;
  --bg-2: #250f1a;
  --bg-3: #08040a;
  --bg-overlay-1: rgba(255, 159, 90, 0.14);
  --bg-overlay-2: rgba(255, 204, 125, 0.1);
  --text-main: #fff4ef;
  --text-muted: #cfb4b0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(7, 10, 30, 0.64);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.5px;
  text-decoration: none;
  color: white;
  white-space: nowrap;
}

.brand span {
  color: var(--accent-1);
}

.nav-links {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.6rem;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 0.15rem;
}

.nav-link {
  text-decoration: none;
  color: #dbe7ff;
  border: 1px solid transparent;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  transition: all 180ms ease;
  position: relative;
  overflow: hidden;
}

.nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(130deg, transparent, rgba(255, 255, 255, 0.16), transparent);
  opacity: 0;
  transition: opacity 220ms ease;
}

.nav-link:hover::before,
.nav-link.active::before {
  opacity: 1;
}

.nav-link:hover,
.nav-link.active {
  border-color: rgba(127, 209, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(127, 209, 255, 0.18) inset, 0 0 18px rgba(127, 209, 255, 0.2);
  background: rgba(127, 209, 255, 0.12);
}

.theme-switcher {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.theme-btn {
  border: 1px solid rgba(255, 255, 255, 0.26);
  background: rgba(255, 255, 255, 0.06);
  color: #eaf2ff;
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 600;
  transition: all 120ms ease;
}

.theme-btn:hover,
.theme-btn.active {
  border-color: rgba(141, 255, 197, 0.85);
  background: rgba(141, 255, 197, 0.16);
  box-shadow: 0 0 16px rgba(141, 255, 197, 0.2);
}

.main {
  max-width: 1120px;
  margin: 2.3rem auto;
  padding: 0 1rem 3rem;
}

.main-wide {
  max-width: min(1440px, calc(100vw - 1.2rem));
}

.hero,
.content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 2rem;
  margin-bottom: 1.4rem;
  position: relative;
  overflow: hidden;
}

.hero {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-kicker {
  margin: 0 0 0.7rem;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 700;
}

.hero::before,
.content::before {
  content: '';
  position: absolute;
  inset: auto -150px -130px auto;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-1) 30%, transparent), transparent 65%);
  filter: blur(2px);
  animation: drift 9s ease-in-out infinite alternate;
}

.content::before {
  inset: -140px auto auto -120px;
  width: 220px;
  height: 220px;
  animation-duration: 12s;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-2) 26%, transparent), transparent 62%);
}

.hero h1,
.content h1,
.content h2,
.content h3 {
  position: relative;
  z-index: 1;
  letter-spacing: 0.01em;
}

.hero h1 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  background: linear-gradient(90deg, #ffffff 10%, var(--accent-1) 48%, var(--accent-2) 78%);
  -webkit-background-clip: text;
  color: transparent;
  margin: 0 0 0.8rem;
}

.subtle {
  color: var(--text-muted);
  margin-bottom: 1.4rem;
  max-width: 76ch;
}

.hero-context {
  margin: 1rem 0 0;
  color: #d8e6ff;
  max-width: 76ch;
}

h2 {
  margin-top: 0;
}

.btn-row {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.2rem;
}

.hero .btn-row {
  max-width: 100%;
}

.btn {
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #f2f8ff;
  padding: 0.65rem 1rem;
  border-radius: 11px;
  font-weight: 700;
  transition: 180ms ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(120deg, rgba(127, 209, 255, 0.2), rgba(141, 255, 197, 0.14));
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.14), transparent);
  transform: translateX(-130%);
  transition: transform 230ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(141, 255, 197, 0.85);
  box-shadow: var(--accent-glow);
}

.btn:hover::after {
  transform: translateX(130%);
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  position: relative;
  z-index: 1;
}

.card {
  padding: 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-soft);
  min-height: 170px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-soft);
}

.card h3 {
  margin-bottom: 0.55rem;
  font-size: 1.2rem;
}

.card p {
  color: var(--text-muted);
}

.card .btn {
  margin-top: 1rem;
  font-size: 0.9rem;
}

.section {
  margin-top: 1.45rem;
  position: relative;
  z-index: 1;
}

.toc {
  background: rgba(255, 255, 255, 0.05);
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.toc strong {
  color: var(--text-main);
}

.toc a {
  color: #aee9ff;
  text-decoration: none;
  display: inline-block;
  margin: 0.25rem 0.6rem 0.25rem 0;
  transition: color 160ms ease;
}

.toc a:hover {
  color: var(--accent-2);
}

p,
li {
  color: var(--text-muted);
  line-height: 1.55;
}

ul,
ol {
  padding-left: 1.1rem;
}

li {
  margin: 0.3rem 0;
}

strong { color: #f4f9ff; }

code,
pre {
  font-family: var(--font-mono);
}

code {
  background: rgba(4, 7, 15, 0.72);
  padding: 0.12rem 0.4rem;
  border-radius: 7px;
  color: #d5eaff;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
  vertical-align: baseline;
}

p code,
li code,
td code,
figcaption code {
  display: inline;
}

pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  color: inherit;
  white-space: inherit;
  overflow-wrap: normal;
  word-break: normal;
}

.notice {
  margin: 0;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 159, 90, 0.3);
  background: rgba(255, 159, 90, 0.08);
  color: #ffd9ba;
}

pre {
  position: relative;
  background: rgba(4, 7, 15, 0.74);
  border: 1px solid rgba(127, 209, 255, 0.25);
  color: #dceaff;
  border-radius: 12px;
  padding: 1rem;
  white-space: pre-wrap;
  overflow: auto;
}

pre + p { margin-top: 0.9rem; }

.copy-btn {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  padding: 0.3rem 0.55rem;
  background: rgba(127, 209, 255, 0.22);
  color: #f7fdff;
  font-size: 0.78rem;
  font-family: var(--font-sans);
  transition: transform 120ms ease;
}

.copy-btn:hover {
  transform: translateY(-1px);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.figure-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.9rem;
}

.figure-card img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: block;
  background: #050911;
}

.figure-card figcaption {
  color: var(--text-muted);
  margin-top: 0.6rem;
}

.figure-card h3 {
  margin: 0.2rem 0 0.45rem 0;
}

.page-figure {
  margin-top: 1.6rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem;
  box-shadow: var(--shadow-soft);
}

.page-figure h3 {
  margin-top: 0;
}

.page-figure img {
  width: 100%;
  min-height: 55vh;
  max-height: 78vh;
  object-fit: contain;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #050911;
  display: block;
}

.page-figure figcaption {
  color: var(--text-muted);
  margin-top: 0.8rem;
}

.callout-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 1rem;
}

.callout {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.04);
}

.callout h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.section-lead {
  font-size: 1.02rem;
  color: #d8e6ff;
  max-width: 76ch;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 14px;
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  padding: 0.8rem;
  vertical-align: top;
  text-align: left;
}

th {
  color: #f5fbff;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.05);
}

tbody tr:hover {
  background: rgba(255, 255, 255, 0.045);
}

footer {
  text-align: center;
  color: #c5d2ed;
  padding: 0.5rem 1rem 2.5rem;
}

@keyframes drift {
  0% {
    transform: translateY(0) translateX(0) scale(1);
  }

  50% {
    transform: translateY(-12px) translateX(-10px) scale(1.05);
  }

  100% {
    transform: translateY(10px) translateX(9px) scale(0.97);
  }
}

@media (max-width: 720px) {
  .hero,
  .content { padding: 1.3rem; }

  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .theme-switcher {
    margin-left: 0;
    margin-top: 0.4rem;
  }
}