/* ==========================================================================
   Web3 Field Guide — styles
   Palette: warm paper + deep ink, with riso-print accents (mint, tomato,
   butter, lilac, sky). Light by design: no dark neon crypto look.
   ========================================================================== */

:root {
  /* Colour tokens */
  --paper: #faf6ee;
  --paper-2: #f2ecdf;
  --card: #fffdf8;
  --ink: #1d2b2a;
  --ink-soft: #4b5a58;
  --ink-faint: #8a9593;
  --mint: #a8e6cf;
  --mint-deep: #1d7f5c;
  --tomato: #ff6b4a;
  --tomato-soft: #ffd9cf;
  --butter: #ffd66b;
  --butter-soft: #fff1c7;
  --lilac: #c8b6ff;
  --sky: #9ed3f0;
  --ok: #1d7f5c;
  --bad: #d9432a;

  /* Type */
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* Shape */
  --radius: 14px;
  --radius-sm: 9px;
  --border: 2px solid var(--ink);
  --shadow: 4px 4px 0 var(--ink);
  --shadow-lg: 7px 7px 0 var(--ink);
  --ease: cubic-bezier(.2, .8, .2, 1);

  --gutter: clamp(16px, 4vw, 40px);
  --maxw: 1180px;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--paper);
  /* faint graph-paper grid */
  background-image:
    linear-gradient(rgba(29, 43, 42, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 43, 42, .045) 1px, transparent 1px);
  background-size: 28px 28px;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
[hidden] { display: none !important; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; }
h1, h2, h3, h4 { margin: 0; line-height: 1.12; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
em { font-style: italic; }
b, strong { font-weight: 700; }
.mono { font-family: var(--font-mono); font-size: .92em; }
::selection { background: var(--butter); color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--tomato);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 10px 14px; border-radius: 8px;
  text-decoration: none; transition: top .2s;
}
.skip-link:focus { top: 12px; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

/* ---------- Progress bar ---------- */
.progress { position: fixed; inset: 0 0 auto 0; height: 4px; z-index: 60; }
.progress span {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--mint-deep), var(--tomato));
  transform: scaleX(0); transform-origin: left;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  padding: .8em 1.3em;
  font-weight: 700; font-size: 1rem; line-height: 1.1;
  border: var(--border); border-radius: 999px;
  text-decoration: none;
  background: var(--card);
  box-shadow: var(--shadow);
  transition: transform .15s var(--ease), box-shadow .15s var(--ease), background .2s;
}
.btn svg { width: 1.1em; height: 1.1em; fill: none; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; box-shadow: var(--shadow); }
.btn-primary { background: var(--tomato); color: var(--ink); }
.btn-primary:hover { background: #ff8466; }
.btn-ghost { background: var(--card); }
.btn-ghost:hover { background: var(--butter-soft); }
.btn-small { padding: .55em 1em; font-size: .9rem; box-shadow: 3px 3px 0 var(--ink); }
.btn-block { width: 100%; }
.btn-link {
  background: none; border: 0; padding: .25em 0;
  font-weight: 600; color: var(--ink-soft);
  text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 2px;
}
.btn-link:hover { color: var(--tomato); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 246, 238, .88);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 2px solid transparent;
  transition: border-color .25s;
}
.site-header.scrolled { border-bottom-color: var(--ink); }
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; line-height: 1; }
.brand small { display: block; font-family: var(--font-mono); font-size: .66rem; font-weight: 400; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); margin-top: 3px; }
.brand-mark { width: 36px; height: 36px; fill: var(--mint); stroke: var(--ink); stroke-width: 2.2; }
.brand-mark rect:nth-child(2) { fill: var(--butter); }
.brand:hover .brand-mark rect:nth-child(2) { fill: var(--tomato); }

.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: 8px 12px; border-radius: 999px;
  text-decoration: none; font-weight: 600; font-size: .95rem; color: var(--ink-soft);
  transition: background .2s, color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); background: var(--paper-2); }
.nav-links .nav-cta { background: var(--mint); color: var(--ink); border: var(--border); box-shadow: 3px 3px 0 var(--ink); margin-left: 8px; }
.nav-links .nav-cta:hover { background: var(--butter); }

.nav-toggle { display: none; width: 44px; height: 44px; border: var(--border); border-radius: 12px; background: var(--card); box-shadow: 3px 3px 0 var(--ink); }
.bars, .bars::before, .bars::after { display: block; width: 18px; height: 2.5px; background: var(--ink); border-radius: 2px; margin: auto; position: relative; transition: transform .25s var(--ease), opacity .2s; }
.bars::before, .bars::after { content: ""; position: absolute; left: 0; }
.bars::before { top: -6px; }
.bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(32px, 5vw, 72px);
  align-items: center; padding-block: clamp(48px, 8vw, 104px) clamp(48px, 6vw, 80px);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: .8rem; letter-spacing: .02em;
  background: var(--card); border: var(--border); border-radius: 999px; padding: 6px 14px;
  margin-bottom: 26px;
}
.eyebrow .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--mint-deep); box-shadow: 0 0 0 3px var(--mint); }
h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.6rem, 6.6vw, 5.2rem); letter-spacing: -.025em; line-height: 1.02;
  margin-bottom: 24px;
}
.scribble { position: relative; font-style: italic; font-weight: 500; white-space: nowrap; z-index: 0; }
.scribble::after {
  content: ""; position: absolute; z-index: -1;
  left: -4%; right: -4%; bottom: .06em; height: .38em;
  background: var(--butter); border-radius: 6px; transform: rotate(-1.5deg) scaleX(0); transform-origin: left;
  animation: highlight 0.9s .5s var(--ease) forwards;
}
@keyframes highlight { to { transform: rotate(-1.5deg) scaleX(1); } }
.lede { font-size: clamp(1.08rem, 1.6vw, 1.22rem); color: var(--ink-soft); max-width: 36em; margin-bottom: 30px; }
.lede strong { color: var(--ink); background: linear-gradient(transparent 62%, var(--mint) 62%); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 28px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; list-style: none; padding: 0; margin: 0; font-size: .92rem; color: var(--ink-soft); }
.hero-meta li { display: flex; align-items: center; gap: 8px; }
.hero-meta li::before { content: ""; width: 8px; height: 8px; border: 2px solid var(--ink); border-radius: 2px; background: var(--lilac); transform: rotate(45deg); }

.hero-visual { position: relative; min-height: 420px; display: flex; align-items: center; justify-content: center; }
.sticker { background: var(--card); border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); }

.live-card { position: relative; z-index: 2; width: min(100%, 360px); padding: 22px 22px 18px; transform: rotate(-1.5deg); animation: floaty 7s ease-in-out infinite; }
@keyframes floaty { 0%, 100% { transform: rotate(-1.5deg) translateY(0); } 50% { transform: rotate(-.5deg) translateY(-8px); } }
.live-card header { display: flex; align-items: center; gap: 10px; font-size: .78rem; color: var(--ink-soft); margin-bottom: 14px; }
.pulse { width: 10px; height: 10px; border-radius: 50%; background: var(--ink-faint); flex: none; }
.pulse.on { background: var(--mint-deep); animation: pulse 1.8s infinite; }
.pulse.off { background: var(--butter); }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(29,127,92,.55); } 80%, 100% { box-shadow: 0 0 0 10px rgba(29,127,92,0); } }
.live-label { font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-soft); margin: 0 0 2px; font-weight: 600; }
.live-number { font-size: clamp(1.9rem, 4vw, 2.4rem); font-weight: 600; margin: 0 0 14px; letter-spacing: -.02em; }
.live-number.bump { animation: bump .6s var(--ease); }
@keyframes bump { 0% { background: var(--butter); } 100% { background: transparent; } }
.live-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 0 0 14px; }
.live-stats div { background: var(--paper-2); border-radius: var(--radius-sm); padding: 8px 10px; }
.live-stats dt { font-size: .7rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .06em; }
.live-stats dd { margin: 2px 0 0; font-weight: 600; font-size: .9rem; }
.live-foot { font-size: .85rem; color: var(--ink-soft); border-top: 2px dashed var(--paper-2); padding-top: 10px; }

.block-stack { position: absolute; inset: 0; pointer-events: none; }
.mini-block {
  position: absolute; width: 132px; padding: 12px 14px; border: var(--border); border-radius: 12px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 2px; font-size: .78rem;
}
.mini-block span { font-weight: 600; font-size: 1rem; }
.mini-block i { font-style: normal; font-family: var(--font-mono); font-size: .7rem; color: var(--ink-soft); }
.b1 { background: var(--mint); top: 2%; left: 2%; transform: rotate(-8deg); animation: drift 9s ease-in-out infinite; }
.b2 { background: var(--lilac); top: 6%; right: 0; transform: rotate(6deg); animation: drift 11s -3s ease-in-out infinite; }
.b3 { background: var(--butter); bottom: 2%; right: 8%; transform: rotate(-4deg); animation: drift 10s -6s ease-in-out infinite; }
@keyframes drift { 0%, 100% { translate: 0 0; } 50% { translate: 0 -12px; } }

/* ---------- Stat strip ---------- */
.stats { background: var(--ink); color: var(--paper); border-block: var(--border); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { display: flex; flex-direction: column; gap: 4px; padding: 28px 20px; border-left: 1px solid rgba(250,246,238,.18); }
.stat:first-child { border-left: 0; }
.stat-num { font-family: var(--font-display); font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 700; line-height: 1; color: var(--butter); }
.stat:nth-child(2) .stat-num { color: var(--mint); }
.stat:nth-child(3) .stat-num { color: var(--lilac); }
.stat:nth-child(4) .stat-num { color: var(--sky); }
.stat > span:last-child { font-size: .92rem; color: rgba(250,246,238,.78); }

/* ---------- Sections ---------- */
.section { padding-block: clamp(72px, 10vw, 128px); }
.section-tint { background: var(--paper-2); border-block: var(--border); }
.section-head { max-width: 780px; margin-bottom: clamp(32px, 5vw, 56px); }
.chapter {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: .82rem; text-transform: uppercase; letter-spacing: .12em; color: var(--ink-soft);
  margin-bottom: 14px;
}
.chapter span { background: var(--ink); color: var(--paper); padding: 3px 8px; border-radius: 6px; letter-spacing: 0; }
h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(2rem, 4.6vw, 3.4rem); letter-spacing: -.02em; margin-bottom: 18px; }
h2 em { font-weight: 500; color: var(--mint-deep); }
.section-tint h2 em { color: var(--tomato); }
h3 { font-size: 1.28rem; font-weight: 700; margin-bottom: 10px; }
.section-intro { font-size: 1.12rem; color: var(--ink-soft); }
.section-intro b, .section-intro strong { color: var(--ink); }

.card { background: var(--card); border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: clamp(20px, 3vw, 30px); }
.label { display: block; font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); margin: 14px 0 6px; }
.hint { font-size: .9rem; color: var(--ink-soft); }
.input {
  width: 100%; padding: 12px 14px; border: var(--border); border-radius: var(--radius-sm); background: var(--paper);
  font-family: var(--font-mono); font-size: .95rem;
}
.input:focus { outline: none; background: var(--butter-soft); box-shadow: 3px 3px 0 var(--ink); }
.step { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--butter); border: var(--border); font-size: .85rem; margin-right: 8px; vertical-align: 2px; }
.badge { display: inline-block; font-family: var(--font-mono); font-size: .75rem; background: var(--lilac); border: 2px solid var(--ink); border-radius: 999px; padding: 2px 10px; color: var(--ink); vertical-align: 2px; white-space: nowrap; }

.note-card { background: var(--butter-soft); border: 2px dashed var(--ink); border-radius: var(--radius); padding: 22px; }
.note-tag { display: inline-block; font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; background: var(--ink); color: var(--butter); border-radius: 6px; padding: 3px 8px; margin-bottom: 10px; }
.note-card blockquote { margin: 12px 0; padding: 12px 14px; background: var(--card); border-left: 5px solid var(--tomato); border-radius: 6px; font-size: .88rem; }

/* ---------- 01 Eras ---------- */
.era { display: grid; grid-template-columns: 260px 1fr; gap: 24px; }
.era-tabs { display: flex; flex-direction: column; gap: 12px; }
.era-tabs button {
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  padding: 18px 20px; text-align: left;
  background: var(--card); border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  transition: transform .2s var(--ease), background .2s;
}
.era-tabs button span { font-size: 1.3rem; font-weight: 600; }
.era-tabs button small { color: var(--ink-soft); font-size: .8rem; }
.era-tabs button:hover { transform: translateX(4px); }
.era-tabs button[aria-selected="true"] { background: var(--ink); color: var(--paper); transform: translateX(8px); }
.era-tabs button[aria-selected="true"] small { color: var(--mint); }
.era-panel {
  display: grid; grid-template-columns: 200px 1fr; gap: 28px; align-items: start;
  background: var(--card); border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg);
  padding: clamp(22px, 4vw, 40px);
  animation: panelIn .45s var(--ease);
}
.era-panel[hidden] { display: none; }
@keyframes panelIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.era-verb { aspect-ratio: 1; display: grid; place-items: center; border: var(--border); border-radius: 50%; text-align: center; padding: 16px; font-family: var(--font-display); font-weight: 700; font-size: 1.35rem; line-height: 1.1; }
#panel-web1 .era-verb { background: var(--sky); }
#panel-web2 .era-verb { background: var(--lilac); }
#panel-web3 .era-verb { background: var(--mint); }
.era-body h3 { font-family: var(--font-display); font-size: clamp(1.4rem, 2.6vw, 1.9rem); font-weight: 600; margin-bottom: 14px; }
.era-body > p { color: var(--ink-soft); }
.era-facts { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.era-facts li { padding: 10px 14px; background: var(--paper); border-radius: var(--radius-sm); border-left: 4px solid var(--ink); }

/* ---------- 02 Blockchain ---------- */
.split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; margin-bottom: 48px; }
.hash-out {
  display: block; min-height: 3.4em; padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--ink); color: var(--mint); word-break: break-all; line-height: 1.5; font-size: .88rem;
}
.hash-out .chg { color: var(--butter); }
.fingerprint .hint { margin-top: 12px; }

.chain-wrap { background: var(--card); border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: clamp(20px, 3vw, 32px); }
.chain-head { display: grid; grid-template-columns: 1fr auto; gap: 8px 24px; align-items: start; margin-bottom: 22px; }
.chain-head h3 { grid-column: 1 / -1; }
.chain-head p { color: var(--ink-soft); margin: 0; max-width: 62em; }
.tag-ok { background: var(--mint); padding: 1px 6px; border-radius: 5px; color: var(--ink); }
.chain {
  list-style: none; margin: 0; padding: 4px 4px 18px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px; overflow-x: auto; scroll-snap-type: x mandatory;
}
.block {
  position: relative; scroll-snap-align: start;
  border: var(--border); border-radius: var(--radius); padding: 16px; background: #e9f8f1;
  transition: background .3s, transform .3s var(--ease);
}
.block.invalid { background: var(--tomato-soft); }
.block.mined { animation: mined .6s var(--ease); }
@keyframes mined { 50% { transform: scale(1.03); } }
.block:not(:last-child)::after {
  content: ""; position: absolute; top: 50%; right: -26px; width: 24px; height: 4px; background: var(--ink);
}
.block.invalid:not(:last-child)::after { background: repeating-linear-gradient(90deg, var(--bad) 0 5px, transparent 5px 9px); }
.block-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.block-top strong { font-family: var(--font-mono); font-size: 1.05rem; }
.block-badge { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; padding: 3px 8px; border-radius: 999px; border: 2px solid var(--ink); background: var(--mint); }
.block.invalid .block-badge { background: var(--tomato); }
.block label { display: block; font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); margin: 10px 0 4px; }
.block textarea {
  width: 100%; resize: vertical; min-height: 64px; padding: 8px 10px; border: 2px solid var(--ink); border-radius: 8px; background: var(--card);
  font-family: var(--font-mono); font-size: .82rem; line-height: 1.4;
}
.block textarea:focus { outline: none; background: var(--butter-soft); }
.block .field { font-family: var(--font-mono); font-size: .74rem; word-break: break-all; background: rgba(255,255,255,.7); padding: 6px 8px; border-radius: 6px; line-height: 1.4; }
.block .field b { color: var(--ok); }
.block.invalid .field.hash b { color: var(--bad); }
.block .field.prev.mismatch { outline: 2px dashed var(--bad); }
.block .mine-btn { margin-top: 12px; width: 100%; }
.chain-verdict { margin: 18px 0 0; font-weight: 600; display: flex; align-items: center; gap: 10px; }
.chain-verdict::before { content: ""; width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--ink); background: var(--mint); flex: none; }
.chain-verdict.bad::before { background: var(--tomato); }

/* ---------- 03 Network ---------- */
.net { display: grid; grid-template-columns: 340px 1fr; gap: 28px; align-items: start; }
.net-controls { display: flex; flex-direction: column; gap: 16px; align-items: flex-start; }
.net-controls .note-card.mini { font-size: .92rem; }
.segmented { display: inline-flex; border: var(--border); border-radius: 999px; background: var(--card); padding: 4px; box-shadow: var(--shadow); }
.segmented button { border: 0; background: none; border-radius: 999px; padding: 8px 16px; font-weight: 700; font-size: .92rem; }
.segmented button[aria-checked="true"] { background: var(--ink); color: var(--paper); }
.net-status { width: 100%; padding: 14px 16px; border: var(--border); border-radius: var(--radius-sm); font-weight: 600; background: var(--mint); transition: background .25s; }
.net-status.warn { background: var(--butter); }
.net-status.down { background: var(--tomato); }
.net-status small { display: block; font-weight: 400; font-size: .86rem; margin-top: 2px; }
.net-stage { background: var(--card); border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 12px; }
#net-svg { width: 100%; height: auto; touch-action: manipulation; }
#net-svg .edge { stroke: var(--ink); stroke-width: 2.5; transition: opacity .3s, stroke .3s; }
#net-svg .edge.dead { stroke: var(--bad); stroke-dasharray: 5 6; opacity: .35; }
#net-svg .edge.flow { stroke-dasharray: 6 8; animation: flow 1.2s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -28; } }
#net-svg .node { cursor: pointer; }
#net-svg .node circle { stroke: var(--ink); stroke-width: 2.5; fill: var(--mint); transition: fill .25s, transform .25s; }
#net-svg .node.hub circle { fill: var(--sky); }
#net-svg .node.off circle { fill: var(--tomato-soft); }
#net-svg .node.cut circle { fill: #e2ddd2; }
#net-svg .node text { font-family: var(--font-mono); font-size: 12px; font-weight: 600; text-anchor: middle; pointer-events: none; fill: var(--ink); paint-order: stroke; stroke: var(--card); stroke-width: 4px; stroke-linejoin: round; }
#net-svg .node .glyph { stroke: none; }
#net-svg .node .glyph { font-size: 15px; font-weight: 600; }
#net-svg .node:hover circle, #net-svg .node:focus-visible circle { fill: var(--butter); }
#net-svg .node:focus { outline: none; }
#net-svg .node:focus-visible circle { stroke-width: 4; }

/* ---------- 04 Concepts ---------- */
.concepts { display: grid; grid-template-columns: 290px 1fr; gap: 24px; align-items: start; margin-bottom: 72px; }
.concept-list { display: flex; flex-direction: column; gap: 10px; }
.concept-list button {
  display: flex; align-items: center; gap: 14px; text-align: left; padding: 12px 14px;
  background: var(--card); border: var(--border); border-radius: var(--radius); font-weight: 700;
  transition: transform .2s var(--ease), box-shadow .2s, background .2s;
}
.concept-list button .ico { width: 40px; height: 40px; flex: none; display: grid; place-items: center; border: 2px solid var(--ink); border-radius: 10px; }
.concept-list button .ico svg { width: 22px; height: 22px; fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.concept-list button small { display: block; font-weight: 400; font-size: .82rem; color: var(--ink-soft); }
.concept-list button:hover { transform: translateX(4px); }
.concept-list button[aria-selected="true"] { box-shadow: var(--shadow); transform: translateX(8px); background: var(--ink); color: var(--paper); }
.concept-list button[aria-selected="true"] small { color: rgba(250,246,238,.7); }
.concept-list button[aria-selected="true"] .ico { border-color: var(--paper); }
.concept-panel { box-shadow: var(--shadow-lg); min-height: 460px; }
.concept-panel:focus-visible { outline-offset: 4px; }
.cp-head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.cp-head .ico { width: 64px; height: 64px; flex: none; border: var(--border); border-radius: 16px; display: grid; place-items: center; }
.cp-head .ico svg { width: 34px; height: 34px; fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.cp-head h3 { font-family: var(--font-display); font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0; }
.cp-head p { margin: 2px 0 0; color: var(--ink-soft); font-size: .95rem; }
.cp-plain { font-size: 1.12rem; margin-bottom: 20px; }
.cp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.cp-box { border: 2px solid var(--ink); border-radius: var(--radius-sm); padding: 14px 16px; font-size: .95rem; }
.cp-box h4 { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 8px; }
.cp-box.like { background: var(--sky); background: color-mix(in srgb, var(--sky) 40%, white); }
.cp-box.real { background: color-mix(in srgb, var(--mint) 45%, white); }
.cp-box.catch { background: var(--tomato-soft); }
.cp-in { animation: panelIn .4s var(--ease); }

.timeline-wrap { margin-top: 8px; }
.timeline-title { font-family: var(--font-display); font-size: clamp(1.4rem, 2.6vw, 1.9rem); margin-bottom: 20px; }
.timeline {
  list-style: none; margin: 0; padding: 26px 4px 18px; display: grid; grid-auto-flow: column; grid-auto-columns: minmax(220px, 1fr);
  gap: 16px; overflow-x: auto; scroll-snap-type: x proximity; position: relative;
}
.timeline::before { content: ""; position: absolute; left: 0; right: 0; top: 10px; height: 3px; background: var(--ink); min-width: 1840px; }
.timeline li { position: relative; scroll-snap-align: start; background: var(--card); border: var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); transition: transform .2s var(--ease); }
.timeline li:hover { transform: translateY(-4px); }
.timeline li::before { content: ""; position: absolute; top: -23px; left: 18px; width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--ink); background: var(--butter); }
.timeline li:nth-child(3n+2)::before { background: var(--mint); }
.timeline li:nth-child(3n)::before { background: var(--lilac); }
.timeline time { font-family: var(--font-mono); font-size: .78rem; font-weight: 600; color: var(--tomato); }
.timeline h4 { font-size: 1.08rem; margin: 4px 0 6px; }
.timeline p { font-size: .9rem; color: var(--ink-soft); }

/* ---------- 05 Vending machine ---------- */
.vm { display: grid; grid-template-columns: .9fr 1.1fr; gap: 24px; align-items: start; margin-bottom: 32px; }
.vm-machine h3 { font-size: 1rem; text-transform: uppercase; letter-spacing: .06em; margin: 20px 0 10px; }
.vm-machine h3:first-child { margin-top: 0; }
.snacks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.snacks button {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 14px 8px;
  border: var(--border); border-radius: var(--radius-sm); background: var(--paper); font-weight: 700; font-size: .95rem;
  transition: transform .15s, background .2s, box-shadow .2s;
}
.snacks button small { font-weight: 400; font-size: .72rem; color: var(--ink-soft); }
.snack-ico { font-size: 1.4rem; line-height: 1; color: var(--tomato); }
.snacks button:nth-child(2) .snack-ico { color: var(--mint-deep); }
.snacks button:nth-child(3) .snack-ico { color: #7a5cf0; }
.snacks button[aria-checked="true"] { background: var(--butter); box-shadow: 3px 3px 0 var(--ink); transform: translate(-2px, -2px); }
.coins { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.coin {
  width: 62px; height: 62px; border-radius: 50%; border: var(--border); background: var(--butter);
  font-family: var(--font-mono); font-weight: 600; font-size: .8rem; box-shadow: inset 0 0 0 5px var(--butter-soft), 3px 3px 0 var(--ink);
  transition: transform .15s;
}
.coin:hover { transform: rotate(-12deg) scale(1.05); }
.coin:active { transform: translateY(4px) scale(.95); }
.vm-paid { margin: 16px 0; font-size: 1.05rem; }
.vm-tray { margin-top: 16px; min-height: 64px; border: 2px dashed var(--ink); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; gap: 10px; padding: 10px; color: var(--ink-soft); font-size: .92rem; text-align: center; background: var(--paper); }
.vm-tray .item { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--ink); animation: drop .6s var(--ease); }
@keyframes drop { from { transform: translateY(-30px); opacity: 0; } to { transform: none; opacity: 1; } }

.code-card { padding: 0; overflow: hidden; }
.code-top { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; border-bottom: var(--border); background: var(--paper-2); font-size: .82rem; }
.dots { display: flex; gap: 6px; }
.dots i { width: 11px; height: 11px; border-radius: 50%; border: 2px solid var(--ink); background: var(--tomato); }
.dots i:nth-child(2) { background: var(--butter); }
.dots i:nth-child(3) { background: var(--mint); }
.code { margin: 0; padding: 14px 0; font-size: .82rem; line-height: 1.75; overflow-x: auto; background: var(--card); }
.code code { display: block; min-width: max-content; }
.code .ln { display: block; padding: 0 18px 0 52px; position: relative; white-space: pre; transition: background .2s; min-height: 1.75em; }
.code .ln::before { content: attr(data-line); position: absolute; left: 0; width: 38px; text-align: right; color: var(--ink-faint); }
.code .ln.hl { background: var(--butter); }
.code .ln.hl-bad { background: var(--tomato-soft); }
.code .ln.hl-ok { background: var(--mint); }
.code .k { color: #7a3fd1; font-weight: 600; }
.code .f { color: #0e6ba8; }
.code .s { color: #b3401f; }
.receipt { border-top: var(--border); padding: 16px 18px; background: var(--paper); font-size: .9rem; min-height: 120px; }
.receipt-empty { color: var(--ink-faint); margin: 0; }
.receipt dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin: 0; }
.receipt dt { color: var(--ink-soft); font-size: .82rem; }
.receipt dd { margin: 0; font-family: var(--font-mono); font-size: .82rem; word-break: break-all; }
.receipt .status-ok { color: var(--ok); font-weight: 700; }
.receipt .status-bad { color: var(--bad); font-weight: 700; }

.callouts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.callout { padding: 20px; border: var(--border); border-radius: var(--radius); background: var(--card); }
.callout h4 { font-family: var(--font-mono); font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 8px; color: var(--mint-deep); }
.callout.warn { background: var(--tomato-soft); }
.callout.warn h4 { color: var(--bad); }
.callout p { font-size: .96rem; }

/* ---------- 06 Myths & quiz ---------- */
.myths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 56px; }
.flip { perspective: 1200px; border: 0; padding: 0; background: none; text-align: left; min-height: 230px; }
.flip-inner { position: relative; display: block; width: 100%; height: 100%; min-height: 230px; transition: transform .7s var(--ease); transform-style: preserve-3d; }
.flip[aria-pressed="true"] .flip-inner { transform: rotateY(180deg); }
.flip-front, .flip-back {
  position: absolute; inset: 0; display: flex; flex-direction: column; gap: 10px;
  padding: 22px; border: var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
}
.flip-front { background: var(--card); font-family: var(--font-display); font-size: 1.28rem; font-weight: 600; line-height: 1.25; }
.flip-back { background: var(--mint); transform: rotateY(180deg); font-size: .98rem; line-height: 1.5; }
.flip:nth-child(2n) .flip-back { background: var(--sky); }
.flip:nth-child(3n) .flip-back { background: var(--lilac); }
.flip-tag { align-self: flex-start; font-family: var(--font-mono); font-size: .7rem; font-weight: 600; text-transform: uppercase; letter-spacing: .1em; padding: 3px 8px; border-radius: 6px; background: var(--tomato); border: 2px solid var(--ink); }
.flip-back .flip-tag { background: var(--card); }
.flip-cta { margin-top: auto; font-family: var(--font-mono); font-size: .75rem; font-weight: 400; color: var(--ink-soft); }
.flip:hover .flip-front { background: var(--butter-soft); }

.quiz { max-width: 760px; margin-inline: auto; box-shadow: var(--shadow-lg); }
.quiz-head { display: flex; justify-content: space-between; align-items: baseline; }
.quiz-head h3 { font-family: var(--font-display); font-size: 1.6rem; }
.quiz-count { margin: 0; color: var(--ink-soft); }
.quiz-bar { height: 10px; border: 2px solid var(--ink); border-radius: 999px; overflow: hidden; margin: 8px 0 22px; background: var(--paper); }
.quiz-bar span { display: block; height: 100%; width: 0; background: var(--mint-deep); transition: width .4s var(--ease); }
.quiz-q { font-size: 1.18rem; font-weight: 700; margin-bottom: 16px; }
.quiz-opts { display: grid; gap: 10px; }
.quiz-opts button {
  text-align: left; padding: 12px 16px; border: var(--border); border-radius: var(--radius-sm); background: var(--paper); font-weight: 600;
  transition: background .2s, transform .15s;
}
.quiz-opts button:hover:not([disabled]) { background: var(--butter-soft); transform: translateX(4px); }
.quiz-opts button[disabled] { cursor: default; }
.quiz-opts button.right { background: var(--mint); }
.quiz-opts button.wrong { background: var(--tomato-soft); text-decoration: line-through; text-decoration-thickness: 2px; }
.quiz-explain { margin-top: 16px; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--butter-soft); border: 2px dashed var(--ink); }
.quiz-next { margin-top: 16px; }
.quiz-result { text-align: center; }
.quiz-result .big { font-family: var(--font-display); font-size: 3.4rem; font-weight: 700; line-height: 1; margin-bottom: 8px; }

/* ---------- 07 Wallet ---------- */
.wallet { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.wallet-card { box-shadow: var(--shadow-lg); background: var(--card); position: relative; overflow: hidden; }
.wallet-card::before { content: ""; position: absolute; right: -60px; top: -60px; width: 180px; height: 180px; border-radius: 50%; background: var(--mint); border: var(--border); opacity: .9; }
.wallet-state { position: relative; }
.wallet-state[hidden] { display: none; }
.wallet-ico { width: 72px; height: 72px; border: var(--border); border-radius: 18px; background: var(--butter); display: grid; place-items: center; margin-bottom: 18px; box-shadow: var(--shadow); }
.wallet-ico svg { width: 42px; height: 42px; fill: none; stroke: var(--ink); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.wallet-state h3 { font-family: var(--font-display); font-size: 1.7rem; }
.wallet-state .btn { margin-top: 12px; }
.wallet-providers { display: grid; gap: 10px; margin-top: 12px; }
.wallet-providers button { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: var(--border); border-radius: var(--radius-sm); background: var(--paper); font-weight: 700; box-shadow: 3px 3px 0 var(--ink); transition: transform .15s, background .2s; }
.wallet-providers button:hover { background: var(--butter-soft); transform: translate(-2px, -2px); }
.wallet-providers img { width: 28px; height: 28px; border-radius: 6px; }
.wallet-providers button span.arrow { margin-left: auto; }
.wallet-error { color: var(--bad); font-weight: 600; font-size: .92rem; margin-top: 12px; min-height: 1em; }
.wallet-error:empty { display: none; }
.wallet-top { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; padding-right: 60px; }
.avatar { width: 56px; height: 56px; border-radius: 16px; border: var(--border); flex: none; }
.wallet-top .label { margin: 0; }
.wallet-addr { font-size: 1.15rem; font-weight: 600; margin: 0; }
.icon-btn { width: 40px; height: 40px; border: var(--border); border-radius: 10px; background: var(--card); display: grid; place-items: center; flex: none; }
.icon-btn svg { width: 20px; height: 20px; fill: none; stroke: var(--ink); stroke-width: 2; }
.icon-btn:hover { background: var(--butter); }
.icon-btn.copied { background: var(--mint); }
.wallet-info { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 0 0 12px; }
.wallet-info div { background: var(--paper-2); border-radius: var(--radius-sm); padding: 10px 12px; min-width: 0; }
.wallet-info dt { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); font-weight: 700; }
.wallet-info dd { margin: 2px 0 0; font-weight: 700; overflow-wrap: anywhere; }
.wallet-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0 12px; }
.signature { margin-top: 18px; padding: 14px 16px; border: 2px dashed var(--ink); border-radius: var(--radius-sm); background: var(--butter-soft); animation: panelIn .4s var(--ease); }
.signature .label { margin-top: 0; }
.sig-out { word-break: break-all; font-size: .78rem; background: var(--card); padding: 8px 10px; border-radius: 6px; }
.wallet-side h3 { font-family: var(--font-display); font-size: 1.6rem; margin-bottom: 14px; }
.steps { list-style: none; counter-reset: s; padding: 0; margin: 0 0 24px; display: grid; gap: 12px; }
.steps li { counter-increment: s; position: relative; padding: 12px 14px 12px 56px; background: var(--card); border: 2px solid var(--ink); border-radius: var(--radius-sm); }
.steps li::before { content: counter(s); position: absolute; left: 12px; top: 10px; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--lilac); border: 2px solid var(--ink); font-family: var(--font-mono); font-weight: 600; font-size: .85rem; }
.honest-note {
  margin-bottom: 32px; padding: clamp(20px, 3vw, 28px);
  background: var(--tomato-soft); border: var(--border); border-left: 10px solid var(--tomato);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.honest-note h3 { font-family: var(--font-display); font-size: clamp(1.25rem, 2.4vw, 1.6rem); margin-bottom: 10px; }
.honest-note a { font-weight: 700; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.honest-highlight {
  padding: 12px 16px; background: var(--butter); border: 2px dashed var(--ink); border-radius: var(--radius-sm);
}
.steps a { font-weight: 700; }
.safety ul { margin: 0; padding-left: 20px; display: grid; gap: 6px; }

/* ---------- Closing & footer ---------- */
.closing { padding-bottom: clamp(72px, 10vw, 120px); }
.closing-card { padding: clamp(28px, 5vw, 56px); background: var(--mint); text-align: center; }
.closing-card h2 { max-width: 18em; margin-inline: auto; }
.closing-card > p { max-width: 38em; margin: 0 auto 26px; font-size: 1.1rem; }
.reading { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.reading a { padding: 10px 16px; border: var(--border); border-radius: 999px; background: var(--card); font-weight: 600; text-decoration: none; box-shadow: 3px 3px 0 var(--ink); transition: transform .15s, background .2s; }
.reading a:hover { transform: translate(-2px, -2px); background: var(--butter); }
.site-footer { border-top: var(--border); background: var(--paper-2); padding-block: 28px; font-size: .92rem; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; }
.footer-inner p { margin: 0; }

/* ---------- Scroll reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; }
  .hero-visual { min-height: 380px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid rgba(250,246,238,.18); }
  .era { grid-template-columns: 1fr; }
  .era-tabs { flex-direction: row; overflow-x: auto; }
  .era-tabs button { flex: 1 0 150px; flex-direction: column; gap: 2px; }
  .era-tabs button:hover, .era-tabs button[aria-selected="true"] { transform: translateY(-3px); }
  .split, .vm, .wallet { grid-template-columns: 1fr; }
  .chain { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: minmax(250px, 1fr); }
  .net { grid-template-columns: 1fr; }
  .net-stage { order: -1; }
  .concepts { grid-template-columns: 1fr; }
  .concept-list { flex-direction: row; overflow-x: auto; padding: 4px 4px 12px; scroll-snap-type: x proximity; }
  .concept-list button { flex: none; scroll-snap-align: start; }
  .concept-list button small { display: none; }
  .concept-list button:hover, .concept-list button[aria-selected="true"] { transform: translateY(-3px); }
  .myths { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .nav-toggle { display: grid; place-items: center; }
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 12px var(--gutter) 20px; background: var(--paper); border-bottom: var(--border);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity .2s, transform .25s var(--ease), visibility .2s;
  }
  .nav-links.open { transform: none; opacity: 1; visibility: visible; }
  .nav-links a { padding: 12px 14px; font-size: 1.05rem; }
  .nav-links .nav-cta { margin: 8px 0 0; text-align: center; }
  .era-panel { grid-template-columns: 1fr; }
  .era-verb { aspect-ratio: auto; border-radius: 999px; padding: 10px 18px; justify-self: start; font-size: 1.1rem; }
  .cp-grid, .callouts { grid-template-columns: 1fr; }
  .chain-head { grid-template-columns: 1fr; }
  .chain-head .btn { justify-self: start; }
}

@media (max-width: 560px) {
  body { font-size: 1rem; }
  .hero-visual { min-height: 340px; }
  .mini-block { width: 110px; padding: 10px; }
  .b3 { right: 0; }
  .live-stats { grid-template-columns: 1fr 1fr; }
  .live-stats div:last-child { grid-column: 1 / -1; }
  .stat { padding: 20px 14px; }
  .myths { grid-template-columns: 1fr; }
  .snacks { grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
  .snacks button { padding: 12px 4px; font-size: .88rem; }
  .coin { width: 56px; height: 56px; }
  .wallet-info { grid-template-columns: 1fr 1fr; }
  .wallet-info div:last-child { grid-column: 1 / -1; }
  .wallet-top { padding-right: 0; }
  .wallet-card::before { width: 120px; height: 120px; right: -50px; top: -50px; }
  .wallet-actions .btn { width: 100%; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .flip, .flip-inner { min-height: 210px; }
}

/* Respect users who prefer less motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}