/*
 * GlowRilla Lab design tokens + PenSync styles
 * Layout: one portrait column of instrument panels (max 760px);
 * from 1040px the converter splits into form + sticky readout.
 * Deliberately single-theme: a dark lab console in every viewer theme.
 */
:root {
  color-scheme: dark;
  /* surfaces */
  --void: #05070f;
  --navy: #0a1028;
  --panel: #0d1433;
  --panel-hi: #131c45;
  --line: #26336e;
  --line-soft: #1a2452;
  /* ink */
  --ink: #eef1ff;
  --ink-2: #b9c2ea;
  --ink-3: #8592c4;
  /* neon accents */
  --cyan: #36f1ff;
  --blue: #3f7cff;
  --purple: #a066ff;
  --magenta: #ff47b8;
  --green: #43ffa0;
  --orange: #ffa143;
  /* semantic */
  --ok: var(--green);
  --warn: var(--orange);
  --stop: #ff5a86;
  /* type */
  --f-display: 'Audiowide', 'Chakra Petch', 'Segoe UI', system-ui, sans-serif;
  --f-head: 'Chakra Petch', 'Segoe UI', system-ui, sans-serif;
  --f-body: 'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
  --f-mono: 'IBM Plex Mono', ui-monospace, Consolas, monospace;
  --r: 16px;
  --r-sm: 10px;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--void); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--void);
  color: var(--ink);
  font: 400 17px/1.55 var(--f-body);
  overflow-x: hidden;
}
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--cyan); }
code { font-family: var(--f-mono); font-size: .88em; color: var(--cyan); }
b, strong { font-weight: 600; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* ---------- atmosphere ---------- */
.bg-fx {
  position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 40% at 10% -5%, rgba(63, 124, 255, .28), transparent 70%),
    radial-gradient(ellipse 50% 35% at 100% 15%, rgba(160, 102, 255, .2), transparent 70%),
    radial-gradient(ellipse 60% 30% at 50% 110%, rgba(255, 71, 184, .16), transparent 70%),
    var(--void);
}
.bg-fx::after {
  content: ''; position: absolute; left: -50%; right: -50%; bottom: -8%; height: 42%;
  background-image:
    linear-gradient(rgba(54, 241, 255, .2) 1px, transparent 1px),
    linear-gradient(90deg, rgba(54, 241, 255, .2) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: perspective(420px) rotateX(62deg);
  transform-origin: bottom center;
  -webkit-mask-image: linear-gradient(to top, #000 10%, transparent 90%);
  mask-image: linear-gradient(to top, #000 10%, transparent 90%);
}
.bg-fx::before {
  content: ''; position: absolute; inset: 0; z-index: 1;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, .022) 0 1px, transparent 1px 3px);
}

.shell {
  position: relative; z-index: 1;
  max-width: 760px; margin: 0 auto;
  padding-inline: 16px; padding-block: 16px 48px;
  display: flex; flex-direction: column; gap: 40px;
}
@media (min-width: 1040px) { .shell { max-width: 1140px; padding-inline: 32px; } }

/* ---------- masthead ---------- */
.masthead { display: flex; flex-direction: column; gap: 18px; }
.tool-nav {
  display: flex; gap: 8px; overflow-x: auto; scrollbar-width: none;
  margin-inline: -16px; padding-inline: 16px; padding-block: 2px;
}
.tool-nav::-webkit-scrollbar { display: none; }
.tool-tab {
  flex: none; display: inline-flex; align-items: center; gap: 6px;
  font: 600 .78rem/1 var(--f-head); letter-spacing: .1em; text-transform: uppercase;
  padding: 9px 12px; border-radius: 999px; border: 1px solid var(--line);
  color: var(--ink-3); text-decoration: none; background: rgba(13, 20, 51, .6);
}
.tool-tab.is-active { color: var(--void); background: var(--cyan); border-color: var(--cyan); box-shadow: 0 0 18px rgba(54, 241, 255, .45); }
.tool-tab small { font-size: .62rem; color: var(--purple); letter-spacing: .12em; }

.hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 8px; }
.hero-text { min-width: 0; display: flex; flex-direction: column; gap: 10px; }
.eyebrow {
  margin: 0; font: 600 .74rem/1.3 var(--f-head); letter-spacing: .2em; text-transform: uppercase; color: var(--magenta);
}
.wordmark { margin: 0; font-family: var(--f-display); font-weight: 400; line-height: .98; display: flex; flex-direction: column; }
.wm-top {
  font-size: clamp(1.55rem, 7.4vw, 3.4rem); letter-spacing: .02em; color: var(--ink);
  text-shadow: 0 0 18px rgba(54, 241, 255, .55), 0 0 2px rgba(54, 241, 255, .9);
}
.wm-bottom {
  font-size: clamp(2rem, 10vw, 4.6rem); letter-spacing: .01em;
  background: linear-gradient(92deg, var(--cyan) 0%, var(--blue) 45%, var(--purple) 70%, var(--magenta) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 14px rgba(160, 102, 255, .45));
}
.wm-bottom sup { font-size: .32em; vertical-align: super; -webkit-text-fill-color: var(--ink-2); }
.tagline { margin: 0; font: 600 clamp(1.05rem, 4.4vw, 1.45rem)/1.25 var(--f-head); color: var(--ink-2); letter-spacing: .02em; }

.hero-art { position: relative; width: clamp(96px, 26vw, 210px); }
.mascot { display: block; width: 100%; height: auto; filter: drop-shadow(0 0 22px rgba(63, 124, 255, .55)); }
.molecule { position: absolute; width: 110%; right: -5%; top: -22%; opacity: .45; z-index: -1; }

/* ---------- primary alert ---------- */
.alert {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px; border-radius: var(--r);
  border: 2px solid var(--warn);
  background: linear-gradient(135deg, rgba(255, 161, 67, .16), rgba(255, 71, 184, .08));
  box-shadow: 0 0 30px -8px rgba(255, 161, 67, .45), inset 0 0 24px rgba(255, 161, 67, .06);
}
.alert p { margin: 0; font-size: clamp(1.08rem, 4vw, 1.3rem); line-height: 1.45; color: var(--ink); }
.alert strong { color: var(--warn); font-family: var(--f-head); font-weight: 700; display: block; margin-bottom: 4px; font-size: 1.08em; }
.alert-icon { flex: none; width: 44px; height: 40px; color: var(--warn); filter: drop-shadow(0 0 8px rgba(255, 161, 67, .6)); }

/* ---------- panels + type ---------- */
.panel {
  background: linear-gradient(180deg, var(--panel-hi), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: inset 0 1px 0 rgba(54, 241, 255, .08), 0 24px 60px -36px #000;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.panel-title { margin: 0; font: 700 1.05rem/1.2 var(--f-head); letter-spacing: .18em; text-transform: uppercase; color: var(--cyan); }
.section-title {
  margin: 0; font: 700 clamp(1.6rem, 6vw, 2.3rem)/1.1 var(--f-head); letter-spacing: .01em; text-wrap: balance;
}
.sub-title { margin: 0; font: 700 1.2rem/1.25 var(--f-head); text-wrap: balance; }
.lede { margin: 0; max-width: 64ch; color: var(--ink-2); font-size: 1.05rem; }
.explain { display: flex; flex-direction: column; gap: 16px; }
.hint { margin: 0; font-size: .9rem; color: var(--ink-3); line-height: 1.45; }

/* ---------- simple how-to ---------- */
.howto { display: block; padding: 16px 20px; border-color: rgba(54, 241, 255, .45); }
.howto > * + * { margin-top: 14px; }
.howto summary { cursor: pointer; font: 700 1.15rem/1.3 var(--f-head); color: var(--cyan); letter-spacing: .02em; border-radius: 6px; }
.howto summary:focus { outline: none; }
.howto summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
.howto p { margin: 0; color: var(--ink-2); max-width: 68ch; }
.howto b { color: var(--ink); }
.howto-steps { list-style: none; margin: 0; padding: 0; counter-reset: s; display: flex; flex-direction: column; gap: 12px; }
.howto-steps li { counter-increment: s; position: relative; padding-left: 48px; color: var(--ink-2); line-height: 1.55; }
.howto-steps li::before {
  content: counter(s); position: absolute; left: 0; top: -2px; width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; font: 700 1rem/1 var(--f-head); color: var(--void);
  background: linear-gradient(135deg, var(--cyan), var(--purple));
}
.howto-legend { display: flex; flex-direction: column; gap: 4px; margin: 6px 0; font-size: .92rem; }
.howto-legend span { display: flex; align-items: center; gap: 8px; }
.howto-legend .dot { display: inline-block; }
.howto-note { padding: 12px 14px; border-radius: var(--r-sm); background: rgba(63, 124, 255, .12); border: 1px solid rgba(63, 124, 255, .45); }
.howto-note.is-red { background: rgba(255, 90, 134, .1); border-color: rgba(255, 90, 134, .45); }

/* ---------- converter ---------- */
.calc-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; align-items: start; }
@media (min-width: 1040px) {
  .calc-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; }
  .results { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 16px); }
}
.calc-form { padding: 20px; display: flex; flex-direction: column; gap: 20px; }
.group { border: 0; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.field { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.label {
  font: 600 .78rem/1.3 var(--f-head); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-2); padding: 0;
}
.row-2 { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.row-2.tight { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; }
@media (min-width: 480px) { .row-2 { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

.input {
  width: 100%; min-width: 0;
  font: 500 1.12rem/1.3 var(--f-mono); color: var(--ink);
  background: var(--void); border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 13px 14px; min-height: 52px;
  transition: border-color .15s, box-shadow .15s;
}
.input::placeholder { color: #4d5a8c; }
.input:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(54, 241, 255, .18), 0 0 18px rgba(54, 241, 255, .2); }
select.input {
  appearance: none; -webkit-appearance: none; font-family: var(--f-body); font-size: 1.02rem; padding-right: 40px;
  background-image: linear-gradient(45deg, transparent 50%, var(--cyan) 50%), linear-gradient(135deg, var(--cyan) 50%, transparent 50%);
  background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%;
  background-size: 6px 6px; background-repeat: no-repeat;
}
textarea.input { font-family: var(--f-body); font-size: 1rem; resize: vertical; }
textarea.code { font: 400 .82rem/1.5 var(--f-mono); }
.input-xl { font-size: 1.5rem; font-weight: 600; }
.input-wrap { position: relative; min-width: 0; }
.input-wrap .input { padding-right: 76px; }
.suffix {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  font: 500 .8rem/1 var(--f-mono); color: var(--ink-3); pointer-events: none; white-space: nowrap;
}
input[type=number]::-webkit-inner-spin-button, input[type=number]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type=number] { -moz-appearance: textfield; }

.sample-flag { margin: 0; font: 600 .74rem/1 var(--f-head); letter-spacing: .12em; text-transform: uppercase; color: var(--orange); display: flex; align-items: center; gap: 8px; }
.link-btn { font: inherit; color: var(--cyan); background: none; border: 0; padding: 6px 2px; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

/* pen chips */
.chips { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; }
.chip {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 700 1.02rem/1 var(--f-head); letter-spacing: .08em;
  color: var(--ink-2); background: var(--void);
  border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 13px 10px; min-height: 50px; cursor: pointer;
  transition: border-color .15s, background .15s, color .15s, box-shadow .15s;
}
.chip:hover { border-color: var(--cyan); color: var(--ink); }
.chip[aria-checked="true"] {
  color: var(--void); background: linear-gradient(135deg, var(--cyan), #7af7ff);
  border-color: var(--cyan); box-shadow: 0 0 20px rgba(54, 241, 255, .45);
}
.dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot.verified { background: var(--ok); box-shadow: 0 0 6px var(--ok); }
.dot.user { background: var(--warn); box-shadow: 0 0 6px var(--warn); }
.dot.unknown { background: var(--stop); box-shadow: 0 0 6px var(--stop); }
.chip[aria-checked="true"] .dot { box-shadow: 0 0 0 2px var(--void); }

.profile-strip {
  padding: 12px 14px; border-radius: var(--r-sm); background: rgba(5, 7, 15, .55); border: 1px dashed var(--line);
  display: flex; flex-direction: column; gap: 6px;
}
.profile-strip p { margin: 0; }
.strip-top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.strip-name { font: 600 1rem/1.3 var(--f-head); margin-right: 4px; }
.strip-cal { font: 500 1rem/1.35 var(--f-mono); color: var(--cyan); }
.strip-cal b { font-weight: 600; }
.is-locked { color: var(--stop) !important; }
.strip-src { font-size: .88rem; color: var(--ink-3); }
.strip-verified { display: flex; align-items: center; gap: 8px; font: 600 .9rem/1.3 var(--f-head); color: var(--ok); }
.strip-verified svg { width: 18px; height: 18px; flex: none; }

.custom-cal { display: flex; flex-direction: column; gap: 12px; padding: 14px; border-radius: var(--r-sm); border: 1px solid rgba(255, 161, 67, .35); background: rgba(255, 161, 67, .04); }
.custom-cal-head { margin: 0; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font: 700 .95rem/1.2 var(--f-head); letter-spacing: .06em; }

/* badges */
.badge, .tag {
  display: inline-flex; align-items: center; white-space: nowrap;
  font: 700 .68rem/1 var(--f-head); letter-spacing: .14em; text-transform: uppercase;
  padding: 5px 8px; border-radius: 6px; border: 1px solid currentColor;
}
.badge.verified, .tag.verified { color: var(--ok); background: rgba(67, 255, 160, .1); }
.badge.user, .tag.user { color: var(--warn); background: rgba(255, 161, 67, .1); }
.badge.unknown, .tag.unknown { color: var(--stop); background: rgba(255, 90, 134, .1); }
.badge.demo { color: var(--purple); background: rgba(160, 102, 255, .12); }
.tag.input { color: var(--blue); background: rgba(63, 124, 255, .1); }
.tag.calc { color: var(--purple); background: rgba(160, 102, 255, .1); }
.tag { font-size: .62rem; padding: 4px 6px; }

/* mode + segmented */
.mode-toggle {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px;
  border-radius: 12px; background: var(--void); border: 1px solid var(--line);
}
.mode-btn {
  font: 700 clamp(.82rem, 3.4vw, 1rem)/1.1 var(--f-head); letter-spacing: .1em;
  color: var(--ink-3); background: transparent; border: 0; border-radius: 9px;
  padding: 14px 8px; min-height: 50px; cursor: pointer;
}
.mode-btn[aria-selected="true"] {
  color: var(--ink); background: linear-gradient(135deg, rgba(63, 124, 255, .9), rgba(160, 102, 255, .9));
  box-shadow: 0 0 22px rgba(120, 110, 255, .45);
}
.seg { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: var(--r-sm); overflow: hidden; }
.seg-3 { grid-template-columns: repeat(3, 1fr); }
.seg-btn {
  font: 600 .98rem/1.1 var(--f-head); letter-spacing: .04em; color: var(--ink-2);
  background: var(--void); border: 0; padding: 12px 6px; min-height: 46px; cursor: pointer;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--line); }
.seg-btn[aria-checked="true"] { color: var(--void); background: var(--cyan); }
.mode-group { display: flex; flex-direction: column; gap: 16px; }

.calc-btn {
  font: 700 1.2rem/1 var(--f-head); letter-spacing: .28em; text-transform: uppercase; color: var(--void);
  border: 0; border-radius: 12px; padding: 20px; min-height: 62px; cursor: pointer;
  background: linear-gradient(100deg, var(--cyan), var(--blue) 55%, var(--purple));
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .15) inset, 0 10px 34px -8px rgba(63, 124, 255, .75);
  transition: transform .12s, box-shadow .15s;
}
.calc-btn:hover { box-shadow: 0 0 0 1px rgba(255, 255, 255, .25) inset, 0 12px 40px -6px rgba(54, 241, 255, .8); }
.calc-btn:active { transform: translateY(1px); }
.calc-btn-sm { font-size: .95rem; letter-spacing: .16em; padding: 14px 18px; min-height: 48px; }
.ghost-btn {
  font: 600 .92rem/1.1 var(--f-head); letter-spacing: .08em; color: var(--cyan);
  background: rgba(54, 241, 255, .05); border: 1px solid rgba(54, 241, 255, .45); border-radius: var(--r-sm);
  padding: 12px 16px; min-height: 46px; cursor: pointer;
}
.ghost-btn:hover { background: rgba(54, 241, 255, .12); }
.ghost-btn.sm { font-size: .82rem; padding: 9px 12px; min-height: 40px; }
.ghost-btn.danger { color: var(--stop); border-color: var(--stop); background: rgba(255, 90, 134, .1); }
.edu-note { margin: 0; font-size: .86rem; color: var(--ink-3); text-align: center; }

/* ---------- results ---------- */
.results { min-width: 0; }
#results-body { display: flex; flex-direction: column; gap: 14px; }
#results-body.flash .readout { animation: readout-in .5s ease-out both; }
#results-body.flash .readout:nth-child(2) { animation-delay: .05s; }
#results-body.flash .readout:nth-child(3) { animation-delay: .1s; }
#results-body.flash .readout:nth-child(4) { animation-delay: .15s; }
#results-body.flash .readout:nth-child(5) { animation-delay: .2s; }
@keyframes readout-in {
  from { opacity: .35; transform: translateY(4px); box-shadow: 0 0 34px rgba(54, 241, 255, .5); }
  to { opacity: 1; transform: none; }
}
.results-empty { padding: 28px 20px; color: var(--ink-2); }
.results-empty p { margin: 0; }
.results-empty-title { font: 700 1rem/1.2 var(--f-head); letter-spacing: .16em; text-transform: uppercase; color: var(--cyan); margin-bottom: 8px !important; }

.verdict { padding: 16px 18px; border-radius: var(--r); border: 1px solid var(--line); background: var(--panel); display: flex; flex-direction: column; gap: 8px; }
.verdict p { margin: 0; }
.verdict ul { margin: 0; padding-left: 20px; color: var(--ink-2); display: flex; flex-direction: column; gap: 4px; }
.verdict-title { font: 700 clamp(1.3rem, 5.4vw, 1.7rem)/1.1 var(--f-head); letter-spacing: .08em; text-transform: uppercase; }
.verdict-text { font-size: 1.04rem; }
.verdict-row { display: flex; gap: 8px; flex-wrap: wrap; }
.verdict-links { display: flex; gap: 18px; flex-wrap: wrap; font: 600 .95rem/1.3 var(--f-head); }
.v-block { border: 2px solid var(--stop); background: linear-gradient(135deg, rgba(255, 90, 134, .14), rgba(13, 20, 51, .9)); box-shadow: 0 0 28px -10px rgba(255, 90, 134, .6); }
.v-block .verdict-title { color: var(--stop); text-shadow: 0 0 14px rgba(255, 90, 134, .5); }
.v-info { border-color: var(--blue); }
.v-info .verdict-title { color: var(--blue); }
.v-ok.v-verified { border-color: rgba(67, 255, 160, .55); box-shadow: 0 0 24px -12px var(--ok); }
.v-ok.v-user { border-color: rgba(255, 161, 67, .5); }

.readouts { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
@media (min-width: 440px) { .readouts { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.readout {
  --acc: var(--cyan);
  position: relative; overflow: hidden; min-width: 0;
  padding: 16px 16px 14px; border-radius: var(--r);
  background: linear-gradient(160deg, color-mix(in srgb, var(--acc) 10%, var(--panel-hi)), var(--panel));
  border: 1px solid color-mix(in srgb, var(--acc) 40%, var(--line));
  display: flex; flex-direction: column; gap: 6px;
}
.readout::before { content: ''; position: absolute; left: 16px; right: 16px; top: 0; height: 2px; background: var(--acc); box-shadow: 0 0 12px var(--acc); opacity: .8; }
.acc-purple { --acc: var(--purple); } .acc-cyan { --acc: var(--cyan); } .acc-green { --acc: var(--green); }
.acc-blue { --acc: var(--blue); } .acc-orange { --acc: var(--orange); }
.readout.is-answer { grid-column: 1 / -1; order: -1; box-shadow: 0 0 34px -12px var(--acc); border-color: var(--acc); }
.readout-label { margin: 0; font: 700 .74rem/1.2 var(--f-head); letter-spacing: .18em; text-transform: uppercase; color: var(--acc); }
.readout-value {
  margin: 0; font: 600 clamp(1.8rem, 8vw, 2.3rem)/1.1 var(--f-mono); color: var(--ink);
  font-variant-numeric: tabular-nums; overflow-wrap: anywhere;
  display: flex; align-items: baseline; flex-wrap: wrap; column-gap: 8px;
}
.readout.is-answer .readout-value { font-size: clamp(2.4rem, 11vw, 3.2rem); text-shadow: 0 0 22px color-mix(in srgb, var(--acc) 55%, transparent); }
.readout-unit { font: 600 .92rem/1.2 var(--f-head); letter-spacing: .04em; color: var(--ink-2); text-shadow: none; }
.readout-sub { margin: 0; font-size: .9rem; color: var(--ink-3); line-height: 1.4; }
.readout.is-locked { --acc: var(--stop); background: repeating-linear-gradient(135deg, rgba(255, 90, 134, .06) 0 10px, transparent 10px 20px), var(--panel); }
.lock { display: inline-flex; align-items: center; gap: 8px; font: 700 1.1rem/1.2 var(--f-head); letter-spacing: .04em; color: var(--stop); }
.lock svg { width: 15px; height: 17px; flex: none; }

.flags { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.flag { padding: 11px 14px 11px 40px; border-radius: var(--r-sm); position: relative; font-size: .96rem; line-height: 1.45; }
.flag::before { position: absolute; left: 14px; top: 11px; font: 700 1rem/1.4 var(--f-head); }
.flag.warn { background: rgba(255, 161, 67, .1); border: 1px solid rgba(255, 161, 67, .45); }
.flag.warn::before { content: '!'; color: var(--warn); }
.flag.note { background: rgba(63, 124, 255, .1); border: 1px solid rgba(63, 124, 255, .45); }
.flag.note::before { content: 'i'; color: var(--blue); }

.result-tools { display: flex; gap: 10px; flex-wrap: wrap; }
.math-panel { padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; }
.math-rule { margin: 0; font-size: .92rem; color: var(--ink-2); }
.math { margin: 0; padding: 0; list-style: none; counter-reset: m; display: flex; flex-direction: column; gap: 10px; }
.math li { counter-increment: m; position: relative; padding: 10px 12px 10px 44px; border-radius: var(--r-sm); background: rgba(5, 7, 15, .6); border: 1px solid var(--line-soft); }
.math li::before { content: counter(m); position: absolute; left: 12px; top: 10px; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font: 700 .78rem/1 var(--f-mono); color: var(--void); background: var(--purple); }
.math p { margin: 0; }
.math-title { font: 700 .95rem/1.3 var(--f-head); }
.math-formula { font-size: .86rem; color: var(--ink-3); }
.math-work { font: 500 .96rem/1.45 var(--f-mono); color: var(--cyan); overflow-wrap: anywhere; }
.math-work b { color: var(--ink); }

.assume { padding: 0; }
.assume summary {
  cursor: pointer; padding: 16px 18px; list-style: none;
  font: 700 .95rem/1.2 var(--f-head); letter-spacing: .14em; text-transform: uppercase; color: var(--cyan);
  display: flex; justify-content: space-between; align-items: center;
}
.assume summary::-webkit-details-marker { display: none; }
.assume summary::after { content: '+'; font-size: 1.3rem; color: var(--ink-3); }
.assume[open] summary::after { content: '−'; }
.table-wrap { overflow-x: auto; }
.assume-list { margin: 0; padding: 0 18px 14px; }
.assume-row {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; grid-template-areas: "k t" "v v";
  gap: 3px 10px; padding: 10px 0; border-top: 1px solid var(--line-soft);
}
.assume-row dt { grid-area: k; font-size: .86rem; color: var(--ink-3); }
.assume-row dd { margin: 0; }
.assume-val { grid-area: v; font: 500 .95rem/1.4 var(--f-mono); overflow-wrap: anywhere; }
.assume-val.na { color: #56628f; }
.assume-tag { grid-area: t; align-self: start; }
@media (min-width: 600px) {
  .assume-row { grid-template-columns: minmax(0, 36%) minmax(0, 1fr) auto; grid-template-areas: "k v t"; align-items: baseline; }
}
@media (min-width: 1040px) {
  .assume-row { grid-template-columns: minmax(0, 1fr) auto; grid-template-areas: "k t" "v v"; }
}

/* ---------- pen vs syringe ---------- */
.lanes { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; }
@media (min-width: 820px) { .lanes { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: stretch; } }
.lane { padding: 18px; border-radius: var(--r); background: var(--panel); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 14px; }
.lane-pen { border-color: rgba(54, 241, 255, .5); }
.lane-syr { border-color: rgba(255, 161, 67, .5); }
.lane-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lane-head h3 { margin: 0; font: 700 1.3rem/1 var(--f-display); letter-spacing: .06em; }
.lane-pen h3 { color: var(--cyan); }
.lane-syr h3 { color: var(--orange); }
.lane-art { width: 170px; max-width: 60%; height: auto; }
.flow { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0; }
.flow li { position: relative; padding: 12px 14px; border-radius: var(--r-sm); background: rgba(5, 7, 15, .6); border: 1px solid var(--line-soft); display: flex; flex-direction: column; gap: 2px; }
.flow li + li { margin-top: 26px; }
.flow li + li::before { content: '↓'; position: absolute; top: -24px; left: 50%; transform: translateX(-50%); font: 700 1.1rem/1 var(--f-mono); }
.lane-pen .flow li + li::before { color: var(--cyan); }
.lane-syr .flow li + li::before { color: var(--orange); }
.flow-k { font: 700 1.02rem/1.25 var(--f-head); }
.flow-v { font: 500 .9rem/1.4 var(--f-mono); color: var(--ink-3); }
.lane-pen .flow li:nth-child(2) { border-color: rgba(255, 71, 184, .5); }
.lane-join { display: flex; align-items: center; justify-content: center; padding: 12px; }
.lane-join span {
  font: 700 .74rem/1.2 var(--f-head); letter-spacing: .16em; text-transform: uppercase; color: var(--magenta);
  border: 1px dashed var(--magenta); border-radius: 999px; padding: 8px 12px; white-space: nowrap;
}
@media (min-width: 820px) { .lane-join span { writing-mode: vertical-rl; padding: 12px 8px; } }

.scale-ref { display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; align-items: start; }
@media (min-width: 720px) { .scale-ref { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); } }
.scale-copy { display: flex; flex-direction: column; gap: 10px; }
.scale-copy p { margin: 0; color: var(--ink-2); max-width: 64ch; }
.ref-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; background: var(--panel); border: 1px solid rgba(255, 161, 67, .45); border-radius: var(--r); overflow: hidden; }
.ref-table caption { text-align: left; font: 700 .78rem/1.2 var(--f-head); letter-spacing: .16em; text-transform: uppercase; color: var(--orange); padding-bottom: 8px; }
.ref-table th, .ref-table td { padding: 10px 16px; text-align: left; font-family: var(--f-mono); }
.ref-table th { font: 600 .74rem/1.2 var(--f-head); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); background: rgba(255, 161, 67, .08); }
.ref-table td { border-top: 1px solid var(--line-soft); font-size: 1.02rem; }
.ref-table td:last-child { color: var(--orange); }

/* ---------- V4 lab ---------- */
.v4-lab { padding: 18px; display: flex; flex-direction: column; gap: 16px; }
.v4-controls { display: flex; flex-direction: column; gap: 8px; }
.v4-readout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
@media (min-width: 560px) { .v4-readout { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.v4-stat { padding: 12px 14px; border-radius: var(--r-sm); background: rgba(5, 7, 15, .6); border: 1px solid var(--line-soft); display: flex; flex-direction: column; gap: 4px; }
.v4-stat span { font-size: .88rem; color: var(--ink-3); }
.v4-stat b { font: 600 1.5rem/1.15 var(--f-mono); color: var(--cyan); }
.chart-wrap { overflow-x: auto; }
.v4-chart { display: block; width: 100%; min-width: 520px; height: auto; }
.c-lab { font: 700 13px var(--f-head); letter-spacing: .08em; }
.c-sub { font: 500 11px var(--f-mono); fill: var(--ink-3); }
.c-tick { font: 600 11px var(--f-mono); }
.c-axis { font: 500 11px var(--f-mono); fill: var(--ink-3); }
.c-mark { font: 700 11px var(--f-mono); fill: var(--magenta); }

/* ---------- check your pen ---------- */
.check-form { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
#check-result { display: flex; flex-direction: column; gap: 12px; }
#check-result:empty { display: none; }
.checklist { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.checklist li { display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px; border-radius: var(--r-sm); background: rgba(5, 7, 15, .6); border: 1px solid var(--line-soft); font-size: .95rem; color: var(--ink-2); }
.checklist b { color: var(--ink); font-family: var(--f-head); }
.ck { flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font: 700 .9rem/1 var(--f-head); }
.checklist .ok .ck { color: var(--void); background: var(--ok); }
.checklist .miss .ck { color: var(--void); background: var(--stop); }

/* ---------- profiles ---------- */
.profiles-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.editor { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
.editor-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
@media (min-width: 560px) { .editor-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .span-2 { grid-column: 1 / -1; } }
.editor-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.form-error { margin: 0; color: var(--stop); font-weight: 500; }
.form-error:empty { display: none; }
.export-wrap { display: flex; flex-direction: column; gap: 10px; }
.export-wrap .ghost-btn { align-self: flex-start; }

.spec-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
@media (min-width: 1040px) { .spec-list { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.spec { padding: 16px; border-radius: var(--r); background: var(--panel); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.spec-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.spec-ver { font: 400 1.25rem/1 var(--f-display); color: var(--cyan); }
.spec-name { font: 600 1rem/1.2 var(--f-head); flex: 1 1 auto; min-width: 0; }
.spec-origin { margin: 0; font-size: .86rem; color: var(--ink-3); }
.spec-grid { margin: 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px 14px; }
.spec-grid div { min-width: 0; }
.spec-grid div:nth-last-child(-n+3) { grid-column: 1 / -1; }
.spec-grid dt { font: 600 .68rem/1.3 var(--f-head); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.spec-grid dd { margin: 2px 0 0; font: 500 .92rem/1.35 var(--f-mono); overflow-wrap: anywhere; }
.spec-grid dd.na { color: #56628f; }
.spec-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- hub + footer ---------- */
.hub { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
@media (min-width: 560px) { .hub { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1040px) { .hub { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
.hub-card { padding: 16px; border-radius: var(--r); border: 1px dashed var(--line); background: rgba(13, 20, 51, .55); display: flex; flex-direction: column; gap: 6px; }
.hub-card.is-active { border: 1px solid var(--cyan); box-shadow: 0 0 22px -10px var(--cyan); }
a.hub-card { color: inherit; text-decoration: none; border-style: solid; }
a.hub-card:hover, a.hub-card:focus-visible { border-color: var(--cyan); box-shadow: 0 0 18px -8px var(--cyan); }
.hub-card h3 { margin: 0; font: 700 1.1rem/1.2 var(--f-head); }
.hub-card p { margin: 0; font-size: .9rem; color: var(--ink-3); }
.hub-card .hub-state { font: 700 .66rem/1 var(--f-head); letter-spacing: .16em; text-transform: uppercase; color: var(--purple); }
.hub-card.is-active .hub-state { color: var(--cyan); }

.footer {
  display: flex; gap: 16px; align-items: center;
  padding-top: 24px; border-top: 1px solid var(--line);
  color: var(--ink-3); font-size: .92rem;
}
.footer p { margin: 0; }
.footer-mascot { width: 56px; height: auto; flex: none; opacity: .9; }
.footer-brand { font: 400 1.05rem/1.3 var(--f-display); color: var(--ink); letter-spacing: .04em; }
.footer-quote { margin-top: 6px !important; color: var(--ink-2); font-style: italic; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}