/* Palette follows the launcher's branding: splash-screen ground, grass green and dirt brown from the block logo. */
:root {
  --ground: #f3f5f2;
  --surface: #ffffff;
  --surface-2: #e9ede8;
  --line: #d6ddd5;
  --text: #121716;
  --muted: #56615e;
  --grass: #1f8a3b;
  --grass-bright: #2e9e46;
  --grass-soft: rgba(46, 158, 70, 0.12);
  --dirt: #74482a;
  --dirt-text: #74482a;
  --on-grass: #ffffff;
  --shadow: 0 18px 40px -24px rgba(18, 40, 25, 0.35);
  --ss-bg: #0f5fa8;

  --font-display: "Silkscreen", "Plus Jakarta Sans", system-ui, sans-serif;
  --font-body: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.75rem;
  --step-3: clamp(2rem, 1.3rem + 2.6vw, 3.25rem);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0c0f10;
    --surface: #141a1b;
    --surface-2: #1a2223;
    --line: #253031;
    --text: #e7eae9;
    --muted: #8e9a97;
    --grass: #4caf50;
    --grass-bright: #5cc160;
    --grass-soft: rgba(76, 175, 80, 0.14);
    --dirt: #8a5a36;
    --dirt-text: #c99468;
    --on-grass: #07140a;
    --shadow: 0 24px 50px -28px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --ground: #0c0f10;
  --surface: #141a1b;
  --surface-2: #1a2223;
  --line: #253031;
  --text: #e7eae9;
  --muted: #8e9a97;
  --grass: #4caf50;
  --grass-bright: #5cc160;
  --grass-soft: rgba(76, 175, 80, 0.14);
  --dirt: #8a5a36;
  --dirt-text: #c99468;
  --on-grass: #07140a;
  --shadow: 0 24px 50px -28px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

h1, h2, h3 { line-height: 1.15; margin: 0; text-wrap: balance; letter-spacing: -0.02em; }
h1 { font-size: var(--step-3); font-weight: 800; }
h2 { font-size: var(--step-2); font-weight: 800; }
h3 { font-size: var(--step-0); font-weight: 700; letter-spacing: -0.005em; }
p { margin: 0; }

:focus-visible { outline: 2px solid var(--grass-bright); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 760px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.skip {
  position: absolute; left: 16px; top: -48px; z-index: 20;
  background: var(--grass); color: var(--on-grass); padding: 8px 12px; border-radius: 6px;
  text-decoration: none; font-weight: 600;
}
.skip:focus { top: 12px; }

/* Silkscreen has no Vietnamese diacritics, so it is reserved for the "MCL" wordmark. */
.eyebrow {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grass);
  margin-bottom: 12px;
}

.wordmark { font-family: var(--font-display); font-size: 1.35rem; letter-spacing: 0.12em; line-height: 1; }
.wordmark.small { font-size: 1.1rem; }

/* Navigation */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--ground) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-links { display: none; gap: 24px; margin-left: 12px; }
.nav-links a { text-decoration: none; color: var(--muted); font-weight: 500; font-size: var(--step--1); }
.nav-links a:hover { color: var(--text); }
@media (min-width: 760px) { .nav-links { display: flex; } }
.nav-tools { margin-left: auto; display: flex; gap: 6px; }
.tool {
  display: inline-flex; align-items: center; justify-content: center;
  height: 36px; min-width: 36px; padding: 0 8px;
  border: 1px solid var(--line); border-radius: 8px;
  background: transparent; color: var(--text);
  font: 600 0.75rem var(--font-mono); cursor: pointer; text-decoration: none;
}
.tool:hover { background: var(--surface-2); }
.tool svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tool svg.fill { fill: currentColor; stroke: none; }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}

/* Hero */
.hero {
  padding: 56px 0 72px;
  border-bottom: 1px solid var(--line);
  overflow-x: clip;
}
.hero-grid { display: grid; gap: 48px; align-items: center; }
@media (min-width: 900px) { .hero { padding: 88px 0 96px; } }
.hero-grid.no-shot { grid-template-columns: 1fr; }
.hero-copy { display: grid; gap: 20px; max-width: 600px; }
.hero-copy .eyebrow { margin-bottom: 0; }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 58ch; }

.download { display: grid; gap: 10px; margin-top: 8px; justify-items: start; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px; border-radius: 10px;
  background: var(--grass); color: var(--on-grass);
  font-weight: 700; font-size: 1.05rem; text-decoration: none;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.22), var(--shadow);
  transition: background 0.15s, transform 0.15s;
}
.btn-primary:hover { background: var(--grass-bright); transform: translateY(-1px); }
.btn-primary svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.dl-meta { font-size: 0.8rem; color: var(--muted); }
.dl-links { display: flex; flex-wrap: wrap; gap: 8px; font-size: var(--step--1); color: var(--muted); }
.dl-links a { color: var(--text); text-underline-offset: 3px; text-decoration-color: var(--line); }
.dl-links a:hover { text-decoration-color: var(--grass); }
.dl-note {
  font-size: var(--step--1); color: var(--text);
  background: var(--grass-soft); border-radius: 8px; padding: 10px 12px; max-width: 52ch;
}

/* Hero screenshot: a real capture of the launcher, framed like a window. */
.hero-shot { margin: 0; min-width: 0; }
.shot-frame {
  border-radius: 12px; overflow: hidden;
  border: 1px solid var(--line); background: #0c0f10;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.6), 0 0 0 6px var(--grass-soft);
}
.shot-frame img { width: 100%; height: auto; }
@media (min-width: 900px) {
  .hero-grid { grid-template-columns: 0.9fr 1.1fr; }
  .hero-shot { margin-right: -48px; }
}
@media (min-width: 1200px) { .hero-shot { margin-right: -120px; } }

/* Features */
.features, .install, .faq { padding: 80px 0; }
.features h2, .install h2, .faq h2 { max-width: 24ch; }
.feat-grid {
  display: grid; gap: 1px; margin-top: 40px;
  background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
}
@media (min-width: 640px) { .feat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .feat-grid { grid-template-columns: repeat(3, 1fr); } }
.feat { background: var(--surface); padding: 28px 24px; display: grid; gap: 10px; align-content: start; }
.feat svg {
  width: 36px; height: 36px; padding: 7px; border-radius: 8px;
  background: var(--grass-soft); stroke: var(--grass); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.feat p { color: var(--muted); font-size: 0.95rem; }
.also { margin-top: 20px; color: var(--muted); font-size: var(--step--1); }

/* P2P rooms */
.p2p { padding: 80px 0; background: var(--surface); border-top: 1px solid var(--line); }
.p2p-grid { display: grid; gap: 48px; align-items: center; }
@media (min-width: 900px) { .p2p-grid { grid-template-columns: 1.1fr 0.9fr; } }
.p2p-copy { display: grid; gap: 16px; }
.p2p-copy .eyebrow { margin-bottom: 0; }
.p2p-copy h2 { max-width: 22ch; }
.p2p-lead { color: var(--muted); max-width: 58ch; }
.p2p-points { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 14px; }
.p2p-points li { display: grid; gap: 2px; padding-left: 20px; position: relative; }
.p2p-points li::before {
  content: ""; position: absolute; left: 0; top: 0.5em; width: 8px; height: 8px; background: var(--grass);
}
.p2p-points span { color: var(--muted); font-size: 0.95rem; }

.p2p-diagram { margin: 0; }
.p2p-diagram svg { width: 100%; height: auto; max-width: 460px; display: block; margin: 0 auto; overflow: visible; }
.p2p-diagram text { font-family: var(--font-mono); font-size: 12px; fill: var(--muted); }
.p2p-diagram .direct-label { fill: var(--grass); font-weight: 500; }
.p2p-diagram .relay-label { fill: var(--muted); }
.direct-path { stroke: var(--grass); stroke-width: 3; stroke-dasharray: 10 8; animation: flow 1.2s linear infinite; }
.relay-path { fill: none; stroke: var(--muted); stroke-opacity: 0.5; stroke-width: 2; stroke-dasharray: 3 6; }
.relay-box { fill: var(--ground); stroke: var(--line); }
.pc rect { fill: var(--surface-2); stroke: var(--line); }
.pc .pc-screen { fill: var(--grass-soft); stroke: var(--grass); }
.pc .pc-stand { fill: var(--line); stroke: none; }
.p2p-diagram .pc-label { fill: var(--text); font-family: var(--font-body); font-size: 13px; font-weight: 600; }
@keyframes flow { to { stroke-dashoffset: -36; } }

/* Install */
.install { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.steps { list-style: none; padding: 0; margin: 40px 0 0; display: grid; gap: 32px; }
@media (min-width: 900px) { .steps { grid-template-columns: repeat(3, 1fr); gap: 40px; } }
.step { display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: start; }
.step > div { display: grid; gap: 8px; min-width: 0; }
.step p { color: var(--muted); font-size: 0.95rem; }
.step-n {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 6px;
  background: var(--dirt); color: #fff; font-weight: 500;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.25);
}
.step code {
  font-size: 0.78rem; background: var(--surface-2); color: var(--text);
  padding: 2px 6px; border-radius: 4px; overflow-wrap: anywhere;
}
.smartscreen {
  margin-top: 8px; background: var(--ss-bg); color: #fff; border-radius: 6px;
  padding: 14px 16px; font-family: "Segoe UI", var(--font-body); font-size: 0.72rem; line-height: 1.45;
  display: grid; gap: 6px; max-width: 320px;
}
.ss-title { font-size: 0.95rem; font-weight: 600; }
.ss-body { opacity: 0.9; }
.ss-link { text-decoration: underline; font-weight: 600; outline: 2px dashed #ffd76a; outline-offset: 2px; justify-self: start; }
.ss-actions { display: flex; gap: 6px; justify-content: flex-end; margin-top: 4px; }
.ss-btn { border: 1px solid rgba(255, 255, 255, 0.7); padding: 3px 10px; }
.ss-run { outline: 2px dashed #ffd76a; outline-offset: 2px; }
.more { margin-top: 32px; }
.more a, .faq a { color: var(--grass); font-weight: 600; text-underline-offset: 3px; }

/* FAQ */
.faq h2 { margin-bottom: 28px; }
details { border-bottom: 1px solid var(--line); }
details:first-of-type { border-top: 1px solid var(--line); }
summary {
  cursor: pointer; list-style: none; padding: 18px 36px 18px 0; position: relative;
  font-weight: 600;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-size: 1.2rem; color: var(--muted);
}
details[open] summary::after { content: "−"; }
details p { padding: 0 0 20px; color: var(--muted); max-width: 65ch; }

/* Community */
.community { padding: 0 0 80px; }
.community-inner {
  display: grid; gap: 24px; align-items: center;
  background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  padding: 32px 24px;
}
@media (min-width: 800px) { .community-inner { grid-template-columns: 1fr auto; padding: 40px 48px; } }
.community-inner p { color: var(--muted); margin-top: 8px; }
.community-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn-discord, .btn-ghost {
  display: inline-flex; align-items: center; gap: 10px; padding: 12px 20px; border-radius: 10px;
  font-weight: 700; text-decoration: none;
}
.btn-discord { background: #5865f2; color: #fff; }
.btn-discord:hover { background: #4752c4; }
.btn-discord[aria-disabled="true"] { background: var(--surface-2); color: var(--muted); pointer-events: none; }
.btn-discord svg { width: 20px; height: 20px; fill: currentColor; }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { background: var(--surface-2); }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 32px 0 40px; font-size: var(--step--1); color: var(--muted); }
.footer-inner { display: grid; gap: 20px; }
@media (min-width: 800px) { .footer-inner { grid-template-columns: 1fr auto; align-items: center; } }
.footer-brand { display: grid; gap: 8px; max-width: 60ch; }
.footer-brand .wordmark { color: var(--text); }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--text); }

@media (max-width: 480px) {
  .btn-primary { width: 100%; justify-content: center; }
  .download { justify-items: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .direct-path { animation: none; }
  .btn-primary { transition: none; }
}

/* Beta marker for the P2P rooms section. */
.p2p-tag { display: flex; align-items: center; gap: 10px; }
.p2p-tag .eyebrow { margin-bottom: 0; }
.beta {
  font-size: 0.68rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--dirt-text); border: 1px solid currentColor; border-radius: 4px; padding: 1px 6px;
}
.beta-note {
  font-size: var(--step--1); color: var(--muted); max-width: 58ch;
  border-left: 3px solid var(--dirt); padding: 4px 0 4px 12px; margin-top: 4px;
}