@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #fcfcfb;
  --bg-warm: #f6f5f0;
  --fg: #1c1917;
  --fg-secondary: #57534e;
  --fg-tertiary: #a8a29e;
  --border: #e7e5e4;
  --green: #16a34a;
  --green-soft: #dcfce7;
  --green-dim: #15803d;
  --terminal-bg: #1c1917;
  --terminal-bar: #292524;
  --terminal-fg: #e7e5e4;
  --terminal-green: #4ade80;
  --terminal-muted: #78716c;
  --blue: #2563eb;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', -apple-system, system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* --- header --- */
header {
  padding: 1.5rem 2rem;
}
.wordmark {
  font-size: 0.85rem;
  color: var(--fg-secondary);
}
.wordmark-name {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: -0.02em;
  color: var(--fg-secondary);
}
.wordmark-name .dot { color: var(--green); }
.wordmark .sep { color: var(--fg-tertiary); margin: 0 0.3rem; }
.wordmark .tagline { color: var(--fg-tertiary); font-weight: 400; }

/* --- hero --- */
.hero {
  max-width: 620px;
  margin: 0 auto;
  padding: 8vh 2rem 6rem;
  text-align: center;
}

/* --- logo --- */
.logo {
  width: 80px;
  height: 80px;
  margin-bottom: 2rem;
}
.logo .spoke {
  fill: none;
  stroke: var(--green);
  stroke-width: 4;
  stroke-linecap: round;
}
.logo .hub {
  fill: var(--bg);
  stroke: var(--green);
  stroke-width: 3.5;
}
.logo .hub-dot {
  fill: var(--green);
}
.logo .rim {
  fill: none;
  stroke: var(--green);
  stroke-width: 2;
  opacity: 0.18;
}
.logo .tip {
  fill: var(--bg);
  stroke: var(--green);
  stroke-width: 3;
}

h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(2.2rem, 5.5vw, 3rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: 0.6rem;
  line-height: 1.1;
}
h1 .dot { color: var(--green); }

.subtitle {
  font-size: 1.15rem;
  color: var(--fg-secondary);
  margin-bottom: 3rem;
  font-weight: 400;
}

/* --- terminal --- */
.terminal {
  background: var(--terminal-bg);
  border-radius: 12px;
  overflow: hidden;
  text-align: left;
  margin-bottom: 0.75rem;
  box-shadow:
    0 1px 2px rgba(0,0,0,0.06),
    0 8px 32px rgba(0,0,0,0.1);
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 14px 18px;
  background: var(--terminal-bar);
}
.terminal-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.terminal-dot.r { background: #ef4444; }
.terminal-dot.y { background: #eab308; }
.terminal-dot.g { background: #22c55e; }
.terminal-body {
  padding: 1.25rem 1.5rem 1.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(0.78rem, 1.8vw, 0.88rem);
  line-height: 2;
}
.terminal-body .line {
  display: flex;
  gap: 0;
  line-height: 2;
}
.terminal-body .prompt {
  color: var(--terminal-green);
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none;
  padding-right: 0.5em;
  flex-shrink: 0;
}
.terminal-body .cmd { color: var(--terminal-fg); }
.terminal-body .comment {
  color: var(--terminal-muted);
  user-select: none;
  -webkit-user-select: none;
}

/* --- tabs --- */
.terminal-tabs {
  display: flex;
  gap: 0;
  padding: 0 18px;
  background: var(--terminal-bar);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.terminal-tab {
  padding: 0.5rem 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--terminal-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.terminal-tab:hover { color: var(--terminal-fg); }
.terminal-tab.active {
  color: var(--terminal-fg);
  border-bottom-color: var(--terminal-green);
}
.terminal-panel { display: none; }
.terminal-panel.active { display: block; }

.intro {
  font-size: 1rem;
  color: var(--fg-secondary);
  margin-bottom: 2rem;
  font-weight: 400;
}

.hint {
  font-size: 0.82rem;
  color: var(--fg-tertiary);
  margin-bottom: 3.5rem;
}

/* --- explainer --- */
.explainer {
  background: var(--green-soft);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  text-align: left;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--green-dim);
}
.explainer strong {
  font-weight: 600;
  color: var(--green);
}
.explainer code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: rgba(22, 163, 74, 0.1);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

/* --- faq --- */
.faq {
  max-width: 620px;
  margin: 0 auto;
  padding: 4rem 2rem 5rem;
}
.faq h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-tertiary);
  margin-bottom: 2.5rem;
}
.faq-item {
  margin-bottom: 2.2rem;
}
.faq-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--fg);
}
.faq-item p {
  color: var(--fg-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}
.faq-item a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
.faq-item a:hover { border-bottom-color: var(--blue); }
.faq-item code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: var(--bg-warm);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

/* --- spacer (forces deliberate scroll) --- */
.spacer {
  height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.spacer p {
  font-size: 0.85rem;
  color: var(--fg-tertiary);
  font-style: italic;
}

/* --- footer (scroll fade-in) --- */
footer {
  max-width: 620px;
  margin: 0 auto;
  padding: 4rem 2rem 5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.95rem;
  color: var(--fg-secondary);
  line-height: 1.8;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
footer.visible {
  opacity: 1;
  transform: translateY(0);
}
footer a {
  color: var(--fg-secondary);
  text-decoration: none;
  transition: color 0.15s;
}
footer a:hover { color: var(--fg); }
footer .links {
  margin-top: 1.5rem;
  font-size: 0.9rem;
}
footer .sep {
  margin: 0 0.75rem;
  color: var(--border);
}
footer .copyright {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--fg-tertiary);
}
footer .copyright a {
  color: var(--fg-secondary);
}

/* --- animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.logo      { animation: fadeUp 0.6s ease both; }
h1         { animation: fadeUp 0.6s ease 0.05s both; }
.subtitle  { animation: fadeUp 0.6s ease 0.1s both; }
.intro     { animation: fadeUp 0.6s ease 0.14s both; }
.terminal  { animation: fadeUp 0.6s ease 0.2s both; }
.hint      { animation: fadeUp 0.6s ease 0.22s both; }
.explainer { animation: fadeUp 0.6s ease 0.28s both; }

@media (max-width: 520px) {
  .hero { padding-top: 5vh; }
}