* { box-sizing: border-box; }

:root {
  --surface: #12141c;
  --panel: #191b24;
  --panel-2: #1f2230;
  --line: rgba(255, 255, 255, 0.08);
  --grid-dot: rgba(50, 52, 62, 0.45);
  --text: #e8eaf0;
  --muted: #a9adbd;
  --accent: #c8ff00;
  --accent-dim: rgba(200, 255, 0, 0.14);
  --violet: #8f79c9;
  --radius: 14px;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'SN Pro', system-ui, -apple-system, sans-serif;
  color: var(--text);
  background-color: var(--surface);
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 20px 20px;
  z-index: -1;
}

.accent { color: var(--accent); }

h1, h2, h3 { line-height: 1.15; }

code { font-family: 'JetBrains Mono', Menlo, monospace; }

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 3rem);
  background: rgba(18, 20, 28, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav__logo {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.nav__links { display: flex; gap: 1.25rem; }

.nav__links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.2s;
}

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

.nav__burger {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 1.1rem;
  border-radius: 8px;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}

/* HERO */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  max-width: 1150px;
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 5.5rem) clamp(1rem, 4vw, 3rem);
}

.badge {
  display: inline-block;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(200, 255, 0, 0.3);
  padding: 0.3rem 0.7rem;
  border-radius: 99px;
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.lead {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.65;
  margin: 0 0 1.6rem;
  max-width: 34rem;
}

.hero__cta { display: flex; flex-wrap: wrap; gap: 0.8rem; }

.btn {
  display: inline-block;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.75rem 1.4rem;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn--primary {
  background: var(--accent);
  color: #101208;
  box-shadow: 0 6px 24px rgba(200, 255, 0, 0.25);
}

.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(200, 255, 0, 0.35); }

.btn--ghost {
  color: var(--text);
  border-color: var(--line);
  background: var(--panel);
}

.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero__stats {
  display: flex;
  gap: 1.8rem;
  list-style: none;
  padding: 0;
  margin: 2.2rem 0 0;
  flex-wrap: wrap;
}

.hero__stats li { display: flex; flex-direction: column; }

.hero__stats strong {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 1.6rem;
  color: var(--accent);
}

.hero__stats span { font-size: 0.8rem; color: var(--muted); }

/* WINDOW / CODE */
.window {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.window__bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 0.9rem;
  background: var(--panel-2);
  border-bottom: 1px solid var(--line);
}

.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot--r { background: #ff5f56; }
.dot--y { background: #ffbd2e; }
.dot--g { background: #27c93f; }

.window__name {
  margin-left: 0.6rem;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.75rem;
  color: var(--muted);
}

.window__body {
  margin: 0;
  padding: 1.1rem 1.2rem;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.88rem;
  line-height: 1.7;
  min-height: 9.5rem;
  white-space: pre-wrap;
  color: #d7dae6;
}

.window__body--tall { min-height: 11rem; }

.caret { color: var(--accent); animation: blink 1s steps(1) infinite; }

@keyframes blink { 50% { opacity: 0; } }

.window__out {
  border-top: 1px solid var(--line);
  padding: 0.75rem 1.2rem;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.85rem;
  background: rgba(200, 255, 0, 0.05);
  min-height: 2.6rem;
}

.prompt { color: var(--accent); margin-right: 0.5rem; }

/* SECTIONS */
.section {
  max-width: 1150px;
  margin: 0 auto;
  padding: clamp(2.5rem, 7vh, 4.5rem) clamp(1rem, 4vw, 3rem);
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  margin: 0 0 0.5rem;
}

.section__sub { color: var(--muted); margin: 0 0 2rem; line-height: 1.6; }

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.cards--3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.2rem;
  transition: transform 0.2s, border-color 0.2s;
}

.card:hover { transform: translateY(-5px); border-color: rgba(200, 255, 0, 0.4); }

.card__num {
  font-family: 'JetBrains Mono', Menlo, monospace;
  color: var(--accent);
  font-size: 0.85rem;
}

.card__emoji { font-size: 1.8rem; display: block; margin-bottom: 0.5rem; }

.card h3 { font-size: 1.05rem; margin: 0.6rem 0 0.5rem; }

.card p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.6; }

/* TABS */
.tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }

.tab {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.88rem;
  background: var(--panel);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 0.55rem 1.2rem;
  cursor: pointer;
  transition: all 0.2s;
}

.tab:hover { color: var(--text); }

.tab.is-active {
  background: var(--accent);
  color: #101208;
  border-color: var(--accent);
  font-weight: 600;
}

.tabpanel { display: none; grid-template-columns: 1fr 1fr; gap: 1.5rem; padding: 1.6rem; }
.tabpanel.is-active { display: grid; }

.tabpanel h3 { margin: 0 0 0.6rem; font-size: 1.15rem; }

.tabpanel p { color: var(--muted); line-height: 1.6; margin: 0 0 0.9rem; font-size: 0.94rem; }

.checks { list-style: none; padding: 0; margin: 0 0 1rem; }

.checks li {
  padding: 0.35rem 0 0.35rem 1.6rem;
  position: relative;
  font-size: 0.92rem;
  color: var(--text);
}

.checks li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.meta {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.78rem !important;
  color: var(--violet) !important;
}

.code {
  margin: 0;
  background: #10121a;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.1rem;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.75;
  overflow-x: auto;
  align-self: start;
}

.code .c { color: #6d7185; }
.code .k { color: #c792ea; }
.code .s { color: #c8ff00; }
.code .n { color: #f78c6c; }
.code .f { color: #82aaff; }

/* PLAYGROUND */
.playground {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  grid-template-areas: "list code" "list out";
  gap: 1rem;
}

.playground__list { grid-area: list; display: flex; flex-direction: column; gap: 0.6rem; }

.demo {
  text-align: left;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.86rem;
  background: var(--panel);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.8rem 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.demo:hover { border-color: rgba(200, 255, 0, 0.4); color: var(--text); }

.demo.is-active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.playground__code { grid-area: code; }
.playground__out { grid-area: out; }

.playground__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--line);
}

.hint { font-size: 0.78rem; color: var(--muted); }

.terminal {
  margin: 0;
  padding: 1rem 1.2rem;
  min-height: 8.5rem;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #9dff9d;
  white-space: pre-wrap;
}

/* TIMELINE */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid rgba(200, 255, 0, 0.35);
}

.timeline li {
  position: relative;
  padding: 0 0 1.8rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(200, 255, 0, 0.18);
}

.timeline b { font-family: 'JetBrains Mono', Menlo, monospace; color: var(--accent); font-size: 0.9rem; }

.timeline span { color: var(--muted); line-height: 1.6; font-size: 0.95rem; }

.timeline code {
  background: var(--panel-2);
  padding: 0.1rem 0.4rem;
  border-radius: 5px;
  font-size: 0.85em;
  color: var(--accent);
}

/* AUTHOR */
.author {
  display: flex;
  gap: 1.6rem;
  align-items: flex-start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.3rem, 3vw, 2rem);
  transition: border-color 0.2s;
}

.author:hover { border-color: rgba(200, 255, 0, 0.4); }

.author__avatar {
  flex: 0 0 auto;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  overflow: hidden;
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: #101208;
  background: linear-gradient(135deg, var(--accent), #7bd400);
  box-shadow: 0 8px 26px rgba(200, 255, 0, 0.3);
}

.author__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

.author__name { margin: 0 0 0.3rem; font-size: 1.25rem; }

.author__meta {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.8rem;
  color: var(--violet);
  margin: 0 0 0.9rem;
}

.author__text {
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 1.1rem;
  max-width: 48rem;
  font-size: 0.96rem;
}

.author__tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.tag {
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 0.75rem;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.35rem 0.75rem;
  border-radius: 99px;
}

@media (max-width: 640px) {
  .author { flex-direction: column; align-items: center; text-align: center; }
  .author__tags { justify-content: center; }
}

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 0.7rem; }

.faq__item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.3rem 1.1rem;
  transition: border-color 0.2s;
}

.faq__item[open] { border-color: rgba(200, 255, 0, 0.4); }

.faq__item summary {
  cursor: pointer;
  font-weight: 700;
  padding: 0.85rem 0;
  list-style: none;
  position: relative;
  padding-right: 2rem;
}

.faq__item summary::-webkit-details-marker { display: none; }

.faq__item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0.75rem;
  color: var(--accent);
  font-family: 'JetBrains Mono', Menlo, monospace;
  font-size: 1.2rem;
}

.faq__item[open] summary::after { content: "−"; }

.faq__item p {
  margin: 0 0 1rem;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.94rem;
}

/* CTA */
.cta {
  max-width: 1150px;
  margin: 0 auto 3rem;
  padding: clamp(2.5rem, 6vh, 4rem) clamp(1rem, 4vw, 3rem);
  text-align: center;
  background: linear-gradient(180deg, rgba(200, 255, 0, 0.08), rgba(143, 121, 201, 0.08));
  border: 1px solid var(--line);
  border-radius: 20px;
  margin-inline: clamp(1rem, 4vw, 3rem);
}

.cta h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin: 0 0 0.6rem; }

.cta p { color: var(--muted); margin: 0 0 1.5rem; }

.cta code {
  background: var(--panel-2);
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  color: var(--accent);
}

/* FOOTER */
.footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem clamp(1rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer p { margin: 0; color: var(--muted); font-size: 0.85rem; }

/* REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible { opacity: 1; transform: none; }

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .cards, .cards--3 { grid-template-columns: repeat(2, 1fr); }
  .tabpanel.is-active { grid-template-columns: 1fr; }
  .playground {
    grid-template-columns: 1fr;
    grid-template-areas: "list" "code" "out";
  }
  .playground__list { flex-direction: row; flex-wrap: wrap; }
}

@media (max-width: 640px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 0;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 0.8rem 1.2rem; }
  .nav__burger { display: block; }
  .cards, .cards--3 { grid-template-columns: 1fr; }
  .hero__stats { gap: 1.2rem; }
}