@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&family=Share+Tech+Mono&display=swap');

:root {
  --ink: #001e3c;
  --ink-deep: #00122a;
  --mint: #99ffcc;
  --neon: #00ff41;
  --fg: #dbf7ec;
  --muted: #8db4a9;
  --line: rgba(153, 255, 204, 0.22);
  --line-soft: rgba(153, 255, 204, 0.1);
  --card: rgba(153, 255, 204, 0.045);
  --rail: 272px;
  --r: 4px;
  --mono: 'Share Tech Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Consolas, 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ink-deep);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: -20vmax;
  pointer-events: none;
  z-index: 0;
}

body::before {
  background:
    radial-gradient(38vmax 32vmax at 18% 12%, rgba(0, 255, 65, 0.16), transparent 62%),
    radial-gradient(30vmax 26vmax at 82% 30%, rgba(153, 255, 204, 0.13), transparent 64%),
    radial-gradient(34vmax 30vmax at 60% 92%, rgba(0, 120, 200, 0.22), transparent 66%);
  filter: blur(28px);
  animation: breathe 17s ease-in-out infinite alternate;
}

body::after {
  background-image: radial-gradient(rgba(153, 255, 204, 0.35) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.14;
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
}

@keyframes breathe {
  0% { transform: scale(1) translate3d(0, 0, 0); opacity: 0.85; }
  100% { transform: scale(1.12) translate3d(2%, -3%, 0); opacity: 1; }
}

a {
  color: var(--neon);
  text-decoration-color: rgba(0, 255, 65, 0.45);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--mint);
}

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

:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail);
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  padding: 1.6rem 1.2rem;
  background:
    linear-gradient(180deg, rgba(0, 30, 60, 0.96), rgba(0, 18, 42, 0.98)),
    radial-gradient(22vmax 22vmax at 0% 0%, rgba(0, 255, 65, 0.14), transparent 70%);
  border-right: 1px solid var(--line);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  color: var(--fg);
  text-decoration: none;
  font-size: 1.02rem;
  letter-spacing: 0.08em;
  line-height: 1.35;
}

.brand-mark {
  flex: none;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(0, 255, 65, 0.07);
  animation: pulse 6s ease-in-out infinite;
}

.brand-mark svg {
  width: 20px;
  height: 20px;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 255, 65, 0.45); }
  50% { box-shadow: 0 0 18px 2px rgba(0, 255, 65, 0.22); }
}

.brand-name {
  color: var(--mint);
}

.rail-menu {
  position: relative;
}

.menu-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  color: var(--mint);
  background: rgba(153, 255, 204, 0.06);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: background 0.2s, border-color 0.2s;
}

.menu-btn::-webkit-details-marker {
  display: none;
}

.menu-btn::after {
  content: "▾";
  font-size: 0.8rem;
  color: var(--neon);
  transition: transform 0.22s;
}

.rail-menu[open] .menu-btn {
  background: rgba(0, 255, 65, 0.12);
  border-color: var(--neon);
}

.rail-menu[open] .menu-btn::after {
  transform: rotate(180deg);
}

.menu-list {
  margin: 0.5rem 0 0;
  padding: 0.4rem;
  list-style: none;
  display: grid;
  gap: 2px;
  background: rgba(0, 18, 42, 0.97);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: 0 24px 48px -26px #000;
}

.menu-list a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 0.4rem 0.7rem;
  font-size: 0.92rem;
  color: var(--fg);
  text-decoration: none;
  border-radius: var(--r);
  border-left: 2px solid transparent;
  transition: background 0.18s, color 0.18s, border-color 0.18s, padding-left 0.18s;
}

.menu-list a:hover {
  background: rgba(0, 255, 65, 0.1);
  color: var(--mint);
  border-left-color: var(--neon);
  padding-left: 1rem;
}

.cta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.6rem 1rem;
  text-align: center;
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: #00251a;
  background: linear-gradient(135deg, var(--neon), var(--mint));
  border-radius: var(--r);
  box-shadow: 0 14px 26px -16px var(--neon);
  transition: transform 0.2s, box-shadow 0.2s;
}

.cta:hover {
  color: #00251a;
  transform: translateY(-2px);
  box-shadow: 0 18px 30px -14px var(--neon);
}

.page {
  position: relative;
  z-index: 1;
  margin-left: var(--rail);
}

.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 5rem clamp(1.2rem, 5vw, 4rem) 3.5rem;
  max-width: 1180px;
}

.hero-copy {
  flex: 1 1 auto;
  max-width: 660px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 4.4vw, 3.1rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: #edfff7;
  text-shadow: 0 0 26px rgba(0, 255, 65, 0.28);
}

.hero-desc {
  margin: 0 auto 1.6rem;
  max-width: 48ch;
  color: var(--muted);
  font-size: 1rem;
}

.hero-go {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 1.3rem;
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--mint);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(153, 255, 204, 0.05);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.hero-go:hover {
  border-color: var(--neon);
  background: rgba(0, 255, 65, 0.12);
  transform: translateY(-2px);
}

.hero-fig {
  flex: none;
  margin: 0;
  width: clamp(96px, 15vw, 168px);
  filter: drop-shadow(0 12px 34px rgba(0, 255, 65, 0.3));
  animation: bob 9s ease-in-out infinite alternate;
}

@keyframes bob {
  0% { transform: translateY(-8px) rotate(-2deg); }
  100% { transform: translateY(10px) rotate(2deg); }
}

.badge {
  position: absolute;
  top: 12%;
  right: clamp(1rem, 6vw, 4rem);
  padding: 0.42rem 1rem;
  font-size: 0.82rem;
  letter-spacing: 0.09em;
  color: var(--mint);
  background: rgba(0, 30, 60, 0.72);
  border: 1px solid var(--neon);
  border-radius: 999px;
  animation: glow 7s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { opacity: 0.72; }
  50% { opacity: 1; box-shadow: 0 0 26px -4px var(--neon); }
}

.deck {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  align-items: start;
  max-width: 1180px;
  padding: 0 clamp(1.2rem, 5vw, 4rem) 4rem;
}

.deck-body {
  min-width: 0;
}

.deck-body > div {
  position: relative;
  margin-bottom: 1.6rem;
  padding: clamp(1.2rem, 3vw, 2.2rem);
  background:
    linear-gradient(160deg, rgba(153, 255, 204, 0.06), rgba(0, 30, 60, 0.18)),
    var(--card);
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  box-shadow: 0 24px 48px -34px rgba(0, 0, 0, 0.95);
  scroll-margin-top: 1.6rem;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.deck-body > div::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 18px;
  width: 58px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), transparent);
}

.deck-body > div:hover {
  border-color: var(--line);
  transform: translateY(-3px);
  box-shadow: 0 30px 56px -30px rgba(0, 255, 65, 0.28);
}

.deck-body h2,
.deck-body h3 {
  margin: 0 0 0.6rem;
  color: var(--mint);
  letter-spacing: 0.04em;
  line-height: 1.35;
}

.deck-body h2 {
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
}

.deck-body h3 {
  font-size: 1.1rem;
}

.deck-body hr {
  height: 1px;
  margin: 0.9rem 0 1.3rem;
  border: 0;
  background: linear-gradient(90deg, rgba(0, 255, 65, 0.8), rgba(153, 255, 204, 0.05) 70%, transparent);
}

.deck-body p {
  margin: 0 0 1rem;
  color: var(--fg);
}

.deck-body p:last-child {
  margin-bottom: 0;
}

.deck-body ul,
.deck-body ol {
  margin: 0 0 1.1rem;
  padding-left: 1.3rem;
}

.deck-body li {
  margin-bottom: 0.5rem;
}

.deck-body li::marker {
  color: var(--neon);
}

.deck-body strong {
  color: #effff8;
}

.deck-body blockquote {
  margin: 1.2rem 0;
  padding: 0.7rem 1.1rem;
  border-left: 2px solid var(--neon);
  background: rgba(0, 255, 65, 0.06);
  border-radius: 0 var(--r) var(--r) 0;
  color: var(--mint);
}

.deck-body blockquote p:last-child {
  margin-bottom: 0;
}

.deck-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.2rem;
  font-size: 0.95rem;
}

.deck-body th,
.deck-body td {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line-soft);
  text-align: left;
}

.deck-body th {
  color: var(--mint);
  background: rgba(0, 255, 65, 0.07);
}

.deck-body figure,
.deck-body aside {
  margin: 1.1rem 0;
  padding: 0.9rem 1rem;
  border: 1px dashed var(--line);
  border-radius: var(--r);
  background: rgba(0, 255, 65, 0.04);
}

.deck-aside {
  position: sticky;
  top: 1.6rem;
  padding: 1.1rem 1rem;
  background: rgba(0, 30, 60, 0.55);
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.deck-aside h2 {
  margin: 0 0 0.4rem;
  font-size: 0.92rem;
  letter-spacing: 0.22em;
  color: var(--mint);
}

.deck-aside hr {
  height: 1px;
  margin: 0 0 0.8rem;
  border: 0;
  background: linear-gradient(90deg, var(--neon), transparent);
}

.toc {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.toc a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 40px;
  padding: 0.35rem 0.5rem;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--fg);
  text-decoration: none;
  border-radius: var(--r);
  border-left: 2px solid transparent;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.toc a:hover {
  background: rgba(0, 255, 65, 0.1);
  color: var(--mint);
  border-left-color: var(--neon);
}

.toc-n {
  flex: none;
  font-size: 0.76rem;
  color: var(--neon);
  opacity: 0.8;
}

.foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.8rem 1.6rem;
  max-width: 1180px;
  padding: 2.4rem clamp(1.2rem, 5vw, 4rem) 2rem;
  border-top: 1px solid var(--line-soft);
  position: relative;
  z-index: 1;
}

.foot-brand {
  margin: 0;
  font-size: 1.02rem;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.foot-links {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.4rem;
  justify-content: flex-end;
}

.foot-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.2rem 0.5rem;
  font-size: 0.9rem;
  color: var(--fg);
  text-decoration: none;
}

.foot-links a:hover {
  color: var(--neon);
  text-decoration: underline;
}

.foot-copy {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.68, 0.31, 1);
}

@media (max-width: 940px) {
  .rail {
    position: sticky;
    top: 0;
    width: auto;
    inset: auto;
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.9rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
    font-size: 0.95rem;
  }

  .brand-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .rail-menu {
    flex: none;
  }

  .menu-btn {
    min-height: 42px;
    padding: 0.45rem 0.7rem;
    letter-spacing: 0.1em;
  }

  .menu-list {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: min(74vw, 280px);
    z-index: 40;
  }

  .cta {
    margin-top: 0;
    flex: none;
    min-height: 42px;
    padding: 0.45rem 0.85rem;
    font-size: 0.84rem;
  }

  .page {
    margin-left: 0;
  }

  .hero {
    min-height: 0;
    flex-direction: column;
    align-items: center;
    gap: 1.4rem;
    padding: 2rem 1.1rem 2.4rem;
  }

  .badge {
    position: static;
    order: -1;
    margin: 0;
    font-size: 0.76rem;
  }

  .hero-copy {
    max-width: none;
  }

  .hero h1 {
    font-size: clamp(1.6rem, 7vw, 2.2rem);
  }

  .hero-fig {
    width: 96px;
  }

  .deck {
    grid-template-columns: minmax(0, 1fr);
    padding: 0 1.1rem 2.6rem;
    gap: 1.2rem;
  }

  .deck-aside {
    position: static;
    order: 2;
  }

  .deck-body > div {
    scroll-margin-top: 5.4rem;
  }

  .foot {
    grid-template-columns: minmax(0, 1fr);
    padding: 1.8rem 1.1rem 1.6rem;
  }

  .foot-links {
    justify-content: flex-start;
  }
}

@media (max-width: 400px) {
  .brand-name {
    font-size: 0.88rem;
  }

  .cta {
    font-size: 0.78rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  body::before,
  .brand-mark,
  .hero-fig,
  .badge {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .deck-body > div,
  .cta,
  .hero-go {
    transition: none;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}