/* ============================================================
   VIVI Music DE — site stylesheet
   hand-written, no framework. plain enough to push straight to
   github pages. dark is the default (it's a music app site),
   light theme hangs off [data-theme="light"].
   ============================================================ */

/* ---------- tokens ---------- */
:root {
  color-scheme: dark;
  --bg: #131017;
  --bg2: #171320;
  --surface: #1d1826;
  --surface2: #251e30;
  --surface3: #2e2539;
  --line: rgba(255, 255, 255, 0.08);
  --line2: rgba(255, 255, 255, 0.16);
  --text: #f5f1f4;
  --muted: #a89fb3;
  --faint: #7d7488;
  --accent: #f25555;      /* coral */
  --accent2: #f5a83b;     /* amber */
  --ok: #6fd98b;
  --accent-soft: rgba(242, 85, 85, 0.13);
  --amber-soft: rgba(245, 168, 59, 0.14);
  --grad: linear-gradient(100deg, #f25555 0%, #f5a83b 100%);
  --code-bg: #0f0b14;
  --code-text: #e9e2ee;
  --nav-bg: rgba(19, 16, 23, 0.85);
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
  --font-display: "Unbounded", "Manrope", system-ui, sans-serif;
  --font-body: "Manrope", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --r: 14px;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f3f4;
  --bg2: #efe9ee;
  --surface: #fcfafa;
  --surface2: #efe9ef;
  --surface3: #e5dde6;
  --line: rgba(32, 20, 36, 0.11);
  --line2: rgba(32, 20, 36, 0.22);
  --text: #221b26;
  --muted: #6d6478;
  --faint: #948aa0;
  --accent: #d84343;
  --accent2: #b46f0e;
  --ok: #2f9e57;
  --accent-soft: rgba(216, 67, 67, 0.11);
  --amber-soft: rgba(180, 111, 14, 0.13);
  --grad: linear-gradient(100deg, #d84343 0%, #c9820f 100%);
  --nav-bg: rgba(252, 250, 250, 0.87);
  --shadow: 0 16px 40px rgba(58, 30, 40, 0.14);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html:focus-within { scroll-behavior: smooth; }
html { scroll-padding-top: 92px; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}
/* film-grain overlay, barely there */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 2000;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/><feColorMatrix type='saturate' values='0'/></filter><rect width='160' height='160' filter='url(%23n)' opacity='0.55'/></svg>");
}
:root[data-theme="light"] body::before { opacity: 0.035; }

p { margin: 0 0 14px; }
main { flex: 1 0 auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }
code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  color: var(--accent2);
  white-space: nowrap;
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--accent); color: #fff6f2; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 22px; }
.mono { font-family: var(--font-mono); }
.muted { color: var(--muted); }
.hidden { display: none !important; }
.hnote {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--faint);
  margin: -6px 0 26px;
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 18px; padding: 12px 0; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand em { font-style: normal; color: var(--accent); }
.brand-logo {
  height: 28px;
  width: 28px;
  border-radius: 50%;
  object-fit: cover;
  align-self: center;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.08);
}

.nav-links { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.nav-links a:hover { color: var(--text); text-decoration: none; background: var(--surface2); }
.nav-links a.active { color: var(--text); background: var(--surface2); border-color: var(--line2); }
.nav-links .nav-gh {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent2);
  border: 1px solid var(--line2);
  margin-left: 6px;
}
.nav-links .nav-gh:hover { border-color: var(--accent2); background: var(--amber-soft); }
.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--surface);
  border: 1px solid var(--line2);
  color: var(--text);
  border-radius: 10px;
  padding: 7px 13px;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
}
.theme-toggle {
  appearance: none;
  flex-shrink: 0;
  width: 37px;
  height: 37px;
  border-radius: 999px;
  border: 1px solid var(--line2);
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.theme-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }

@media (max-width: 940px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: var(--bg2);
    border-bottom: 1px solid var(--line);
    padding: 14px 20px 20px;
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a { padding: 11px 14px; border-radius: 10px; }
  .nav-links .nav-gh { margin: 4px 0 0; text-align: center; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font: 700 15px var(--font-body);
  color: #fff7f2;
  background: var(--grad);
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 12px 22px;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease, filter 0.16s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 10px 24px rgba(242, 85, 85, 0.28); }
.btn.ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line2);
}
.btn.ghost:hover { border-color: var(--accent); box-shadow: none; }
.btn.sm { font-size: 13.5px; padding: 9px 15px; border-radius: 10px; }
.btn:disabled, .btn.off {
  opacity: 0.4;
  filter: saturate(0.4);
  pointer-events: none;
  box-shadow: none;
}

/* ---------- shared page furniture ---------- */
.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent2);
  margin: 0 0 10px;
}
.kicker::before { content: "— "; color: var(--faint); }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; line-height: 1.12; }
.section { padding: 72px 0; }
.sec-head { margin-bottom: 36px; }
.sec-head h2 { font-size: clamp(24px, 3.4vw, 36px); margin: 0 0 10px; }
.sec-head .sub { color: var(--muted); font-size: 16px; max-width: 64ch; margin: 0; }

.hl {
  /* marker highlight, not gradient text — reads as annotated, not generated */
  background-image: linear-gradient(transparent 66%, var(--amber-soft) 0, var(--accent-soft) 0);
  padding: 0 0.08em;
}

/* sub-page header */
.phead {
  padding: 58px 0 34px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(52% 120% at 82% 0%, var(--amber-soft), transparent 70%),
    radial-gradient(46% 120% at 8% 20%, var(--accent-soft), transparent 70%);
}
.phead h1 { font-size: clamp(30px, 4.6vw, 48px); margin: 0 0 12px; }
.phead .lead { color: var(--muted); font-size: 17px; max-width: 68ch; margin: 0; }
.pbody { padding: 42px 0 90px; }
.pbody .prose { max-width: 780px; }
.pbody h2 { font-size: clamp(20px, 2.6vw, 27px); margin: 44px 0 14px; }
.pbody h2:first-child { margin-top: 0; }
.pbody h3 { font-family: var(--font-body); font-weight: 800; font-size: 17px; letter-spacing: 0; margin: 28px 0 10px; }

/* code blocks (always dark — it's a terminal, even in light mode) */
pre.code {
  position: relative;
  background: var(--code-bg);
  color: var(--code-text);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 15px 17px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.2px;
  line-height: 1.75;
  margin: 14px 0 18px;
}
pre.code code {
  background: none;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: 9px;
  right: 9px;
  font: 600 11px var(--font-mono);
  letter-spacing: 0.04em;
  color: #cfc7d8;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 5px 10px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.copy-btn:hover { border-color: var(--accent2); color: #fff7f2; }
.copy-btn.ok { color: var(--ok); border-color: var(--ok); }

/* tables */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); margin: 14px 0 20px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.tbl th {
  font: 600 11.5px var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line2);
  white-space: nowrap;
}
.tbl td { padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tr:hover td { background: var(--surface2); }
.tbl td code { white-space: normal; }

/* requirements list (dl) */
.reqs { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); padding: 4px 20px; margin: 14px 0 20px; }
.reqs .row { display: grid; grid-template-columns: 130px 1fr; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.reqs .row:last-child { border-bottom: 0; }
.reqs dt { font: 600 12.5px var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.reqs dd { margin: 0; font-size: 15px; }

/* numbered steps */
.steps { list-style: none; margin: 18px 0 26px; padding: 0; counter-reset: step; }
.steps li { counter-increment: step; position: relative; padding: 0 0 20px 56px; color: var(--muted); }
.steps li strong, .steps li b { color: var(--text); }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  font: 700 14px var(--font-mono);
  color: var(--accent2);
  background: var(--surface2);
  border: 1px solid var(--line2);
  border-radius: 11px;
}

/* tabs (channels + os) */
.tabs { display: flex; gap: 8px; margin: 20px 0 26px; flex-wrap: wrap; }
.tab {
  appearance: none;
  font: 700 14px var(--font-body);
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 20px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.tab:hover { color: var(--text); border-color: var(--line2); }
.tab.active { background: var(--grad); color: #fff7f2; border-color: transparent; }

/* accordion (native details, styled) */
details.qa { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); margin-bottom: 10px; overflow: hidden; transition: border-color 0.2s ease; }
details.qa:hover { border-color: var(--line2); }
details.qa[open] { border-color: var(--line2); }
details.qa summary {
  cursor: pointer;
  padding: 15px 18px;
  font-weight: 800;
  font-size: 15.5px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}
details.qa summary::-webkit-details-marker { display: none; }
details.qa summary::after {
  content: "+";
  font: 600 20px var(--font-mono);
  color: var(--accent2);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
details.qa[open] summary::after { transform: rotate(45deg); }
details.qa .a { padding: 0 18px 16px; color: var(--muted); font-size: 14.5px; }
/* accordion open animation: content fades/slides in under the summary */
@keyframes qaIn { from { opacity: 0; transform: translateY(-7px); } to { opacity: 1; transform: none; } }
details.qa[open] .a { animation: qaIn 0.28s ease both; }
@media (prefers-reduced-motion: reduce) {
  details.qa[open] .a { animation: none; }
}

/* chips */
.chiprow { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 4px; }
.chip {
  font: 600 12px var(--font-mono);
  color: var(--muted);
  background: var(--surface2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 13px;
}

/* ---------- home: hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 74px 0 58px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -10% -8%;
  background:
    radial-gradient(34% 42% at 18% 24%, var(--accent-soft), transparent 70%),
    radial-gradient(38% 46% at 82% 18%, var(--amber-soft), transparent 70%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 52px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero-eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: rec 2.4s ease-in-out infinite;
}
@keyframes rec {
  0%, 100% { box-shadow: 0 0 0 0 rgba(242, 85, 85, 0.55); }
  50% { box-shadow: 0 0 0 7px rgba(242, 85, 85, 0); }
}
.hero h1 {
  font-size: clamp(33px, 5.4vw, 57px);
  margin: 0 0 16px;
  letter-spacing: -0.025em;
  line-height: 1.05;
}
.hero .tagline { color: var(--muted); font-size: 17px; max-width: 54ch; margin: 0 0 28px; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-meta { font: 500 12.5px var(--font-mono); color: var(--faint); letter-spacing: 0.02em; }
.hero-meta b { color: var(--muted); font-weight: 600; }

/* the app window mock — the "screenshot" that lives in the hero */
.hero-right { position: relative; }
.hero-right .ghost {
  position: absolute;
  right: -30px;
  top: -58px;
  z-index: 0;
  font: 800 150px var(--font-display);
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  transform: rotate(-7deg);
  user-select: none;
  pointer-events: none;
}
.mock {
  position: relative;
  z-index: 1;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.mock-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg2);
}
.mock-bar .d { width: 10px; height: 10px; border-radius: 50%; }
.mock-bar .d1 { background: #ff5f57; }
.mock-bar .d2 { background: #febc2e; }
.mock-bar .d3 { background: #28c840; }
.mock-title {
  flex: 1;
  text-align: center;
  font: 500 11.5px var(--font-mono);
  color: var(--faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mock-body { padding: 18px; }
.mock-top { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.disc {
  flex-shrink: 0;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, var(--surface) 0 17%, transparent 18%),
    conic-gradient(from 30deg, #f25555, #f5a83b, #8a4fd8, #3aa8c9, #f25555);
  box-shadow: inset 0 0 0 6px rgba(0, 0, 0, 0.25);
  animation: spin 9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.mock-song { min-width: 0; }
.mock-song .t { font-weight: 800; font-size: 15.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock-song .a { font-size: 13px; color: var(--muted); margin-top: 2px; }
.eq { display: inline-flex; align-items: flex-end; gap: 3px; height: 18px; margin-left: auto; flex-shrink: 0; }
.eq i {
  width: 4px;
  border-radius: 2px;
  background: var(--grad);
  animation: eqbar 1.1s ease-in-out infinite;
}
.eq i:nth-child(1) { height: 40%; }
.eq i:nth-child(2) { height: 90%; animation-delay: 0.15s; }
.eq i:nth-child(3) { height: 60%; animation-delay: 0.3s; }
.eq i:nth-child(4) { height: 100%; animation-delay: 0.45s; }
.eq i:nth-child(5) { height: 55%; animation-delay: 0.6s; }

.mock-lyrics {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 15px;
  margin-bottom: 15px;
  min-height: 92px;
}
.ly { font-size: 13.5px; color: var(--faint); padding: 2.5px 0; transition: color 0.4s ease, opacity 0.4s ease; opacity: 0.65; }
.ly.on { color: var(--text); font-weight: 700; opacity: 1; }

.seek { position: relative; height: 5px; border-radius: 3px; background: var(--surface3); margin: 4px 2px 8px; }
.seek .fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 34%;
  border-radius: 3px;
  background: var(--grad);
}
.seek .knob {
  position: absolute;
  top: 50%;
  left: 34%;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--text);
  border: 3px solid var(--accent);
  transform: translate(-50%, -50%);
  transition: left 1s linear;
}
.mock-times { display: flex; justify-content: space-between; font: 500 11px var(--font-mono); color: var(--faint); margin-bottom: 13px; }
.mock-ctl { display: flex; align-items: center; justify-content: center; gap: 22px; color: var(--muted); }
.mock-ctl button {
  appearance: none;
  background: none;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  display: inline-flex;
  transition: color 0.15s ease, transform 0.15s ease;
}
.mock-ctl button:hover { color: var(--text); transform: scale(1.12); }
.mock-ctl .play {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff7f2;
  justify-content: center;
}
.mock-ctl .play:hover { filter: brightness(1.06); transform: scale(1.05); }

.mock-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 15px;
  padding-top: 13px;
  border-top: 1px solid var(--line);
}
.vol { display: flex; align-items: center; gap: 8px; color: var(--faint); font-size: 13px; }
.vol .track { width: 92px; height: 4px; border-radius: 2px; background: var(--surface3); position: relative; }
.vol .track i { position: absolute; inset: 0 auto 0 0; width: 68%; border-radius: 2px; background: var(--muted); }
.paired {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: 600 11px var(--font-mono);
  color: var(--ok);
  background: var(--surface2);
  border: 1px solid var(--line);
  padding: 5px 11px;
  border-radius: 999px;
  white-space: nowrap;
}
.paired .p-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); animation: rec2 2s ease-in-out infinite; }
@keyframes rec2 {
  0%, 100% { box-shadow: 0 0 0 0 rgba(111, 217, 139, 0.5); }
  50% { box-shadow: 0 0 0 5px rgba(111, 217, 139, 0); }
}

.mini-chip {
  position: absolute;
  z-index: 2;
  left: -16px;
  bottom: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface3);
  border: 1px solid var(--line2);
  border-radius: 13px;
  padding: 9px 14px 9px 10px;
  box-shadow: var(--shadow);
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
.mini-chip .art {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: conic-gradient(from 120deg, #f25555, #f5a83b, #8a4fd8, #f25555);
  position: relative;
}
.mini-chip .art::after { content: ""; position: absolute; inset: 12px; border-radius: 50%; background: var(--surface3); }
.mini-chip .mt { font-size: 12.5px; font-weight: 800; }
.mini-chip .ms { font: 500 10.5px var(--font-mono); color: var(--faint); }

/* hero mock: static app window — no fake song, no animation */
.mock-static .mock-app {
  display: flex;
  gap: 14px;
  min-height: 220px;
}
.mock-static .mock-side {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 74px;
  flex-shrink: 0;
  padding: 10px;
  border-radius: 12px;
  background: var(--surface2);
}
.mock-static .mock-side .mock-logo {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  margin-bottom: 6px;
  background: var(--grad);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.06);
}
.mock-static .mock-side i {
  height: 8px;
  border-radius: 4px;
  background: var(--surface3);
}
.mock-static .mock-side i:first-of-type { background: var(--accent); opacity: 0.55; }
.mock-static .mock-main {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  min-width: 0;
  padding-top: 6px;
}
.mock-static .mock-card {
  height: 26px;
  border-radius: 8px;
  background: var(--surface3);
}
.mock-static .mock-row {
  display: flex;
  gap: 10px;
}
.mock-static .mock-row i {
  flex: 1;
  height: 34px;
  border-radius: 8px;
  background: var(--surface2);
  border: 1px solid var(--line2);
}

/* ---------- ticker ---------- */
.ticker {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg2);
  overflow: hidden;
  padding: 0;
}
.ticker-track {
  display: inline-flex;
  white-space: nowrap;
  animation: tick 30s linear infinite;
  will-change: transform;
}
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker-track span {
  padding: 12px 26px;
  font: 600 11.5px var(--font-mono);
  letter-spacing: 0.2em;
  color: var(--faint);
  display: inline-flex;
  align-items: center;
  gap: 26px;
}
.ticker-track span::after { content: "◆"; color: var(--accent); font-size: 8px; }
@keyframes tick { to { transform: translateX(-50%); } }

/* ---------- bento ---------- */
.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.bcard {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.bcard:hover { transform: translateY(-4px); border-color: var(--line2); box-shadow: var(--shadow); }
.bcard h3 { font-family: var(--font-body); font-weight: 800; font-size: 17.5px; letter-spacing: 0; margin: 0 0 8px; }
.bcard p { color: var(--muted); font-size: 14.5px; margin: 0; }
.b1 { grid-column: span 4; }
.b2 { grid-column: span 2; }
.b3 { grid-column: span 2; }
.b4 { grid-column: span 4; }
.bcard .link { display: inline-block; margin-top: 14px; font-weight: 700; font-size: 14px; }

/* the animated device link inside bento card 1 */
.linkline { display: flex; align-items: center; gap: 16px; margin-top: 20px; }
.dev-chip {
  flex-shrink: 0;
  width: 76px;
  padding: 12px 8px 10px;
  text-align: center;
  background: var(--surface2);
  border: 1px solid var(--line2);
  border-radius: 12px;
  font: 700 10px var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--muted);
}
.dev-chip .di { display: block; font-size: 20px; margin-bottom: 6px; }
.wires { position: relative; flex: 1; height: 2px; background: repeating-linear-gradient(90deg, var(--line2) 0 7px, transparent 7px 14px); }
.wires .pd {
  position: absolute;
  top: -4px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--grad);
  animation: pdot 2.4s linear infinite;
}
.wires .pd.back { animation-name: pdotb; animation-delay: 1.2s; }
@keyframes pdot { 0% { left: 0; opacity: 0; } 12% { opacity: 1; } 88% { opacity: 1; } 100% { left: calc(100% - 10px); opacity: 0; } }
@keyframes pdotb { 0% { left: calc(100% - 10px); opacity: 0; } 12% { opacity: 1; } 88% { opacity: 1; } 100% { left: 0; opacity: 0; } }

.sticker {
  position: absolute;
  top: 15px;
  right: -36px;
  transform: rotate(35deg);
  background: var(--grad);
  color: #fff7f2;
  font: 700 10px var(--font-mono);
  letter-spacing: 0.14em;
  padding: 4px 42px;
  pointer-events: none;
}
.paths { margin-top: 14px; font: 500 12px var(--font-mono); color: var(--faint); line-height: 2; }
.paths code { font-size: 11.5px; }

/* ---------- sync band ---------- */
.band { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 70px 0; position: relative; overflow: hidden; }
.band::after {
  content: "one playback";
  position: absolute;
  left: -12px;
  bottom: -34px;
  font: 800 120px var(--font-display);
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  transform: rotate(-3deg);
  pointer-events: none;
  user-select: none;
}
.band-grid { position: relative; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 46px; align-items: center; }
.band h2 { font-size: clamp(25px, 3.6vw, 38px); margin: 0 0 12px; }
.band p { color: var(--muted); font-size: 15.5px; max-width: 52ch; }
.band .linkline { margin-top: 26px; }

/* ---------- screenshots (css-drawn) ---------- */
.shots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.shot {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 16px;
  overflow: hidden;
  transform: rotate(var(--r, 0deg));
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.shot:hover { transform: rotate(0deg) translateY(-6px); box-shadow: var(--shadow); }
.shot .frame { aspect-ratio: 16 / 11; background: var(--bg2); border-bottom: 1px solid var(--line); display: flex; padding: 12px; gap: 10px; }
.shot figcaption { padding: 12px 15px; font: 500 11.5px var(--font-mono); color: var(--muted); }
/* shot 1: library */
.ui-side { width: 52px; flex-shrink: 0; display: flex; flex-direction: column; gap: 8px; padding-top: 4px; }
.ui-side i { height: 9px; border-radius: 3px; background: var(--surface3); }
.ui-side i.on { background: var(--grad); }
.ui-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 8px; }
.ui-search { height: 18px; border-radius: 9px; background: var(--surface3); position: relative; }
.ui-search::after { content: ""; position: absolute; left: 8px; top: 6px; width: 8px; height: 8px; border: 1.5px solid var(--faint); border-radius: 50%; }
.ui-row { display: flex; align-items: center; gap: 8px; padding: 3px 4px; border-radius: 7px; }
.ui-row:nth-child(3) { background: var(--surface2); }
.ui-art { width: 20px; height: 20px; border-radius: 5px; flex-shrink: 0; }
.ui-row:nth-child(2) .ui-art { background: linear-gradient(135deg, #f25555, #8a2b5e); }
.ui-row:nth-child(3) .ui-art { background: linear-gradient(135deg, #f5a83b, #d84f2a); }
.ui-row:nth-child(4) .ui-art { background: linear-gradient(135deg, #3aa8c9, #2b4dd8); }
.ui-row:nth-child(5) .ui-art { background: linear-gradient(135deg, #6fd98b, #2aa87a); }
.ui-row:nth-child(6) .ui-art { background: linear-gradient(135deg, #8a4fd8, #d84f9e); }
.ui-lines { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.ui-lines i { height: 6px; border-radius: 3px; background: var(--surface3); }
.ui-lines i:first-child { width: 62%; }
/* shot 2: player */
.shot .frame.center { flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.shot .frame .s-disc {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, var(--bg2) 0 16%, transparent 17%), conic-gradient(from 30deg, #f25555, #f5a83b, #8a4fd8, #3aa8c9, #f25555);
  animation: spin 8s linear infinite;
  margin-bottom: 10px;
}
.shot .frame .s-title { height: 8px; width: 46%; border-radius: 4px; background: var(--surface3); margin-bottom: 6px; }
.shot .frame .s-sub { height: 6px; width: 30%; border-radius: 3px; background: var(--surface3); opacity: 0.7; }
.shot .frame .s-ly { margin-top: 12px; display: flex; flex-direction: column; gap: 5px; align-items: center; }
.shot .frame .s-ly i { height: 5px; border-radius: 3px; background: var(--surface3); }
.shot .frame .s-ly i.on { background: var(--grad); width: 56%; }
.shot .frame .s-ly i:nth-child(1) { width: 72%; }
.shot .frame .s-ly i:nth-child(3) { width: 64%; }
/* shot 3: device sync */
.shot .frame.sync { flex-direction: column; align-items: center; justify-content: center; gap: 10px; }
.qr-mini { width: 62px; height: 62px; background: #f4f1ee; border-radius: 8px; padding: 6px; }
.s-code { font: 700 14px var(--font-mono); letter-spacing: 0.3em; color: var(--text); }
.s-btns { display: flex; gap: 7px; }
.s-btns i { height: 16px; width: 52px; border-radius: 8px; background: var(--surface3); }
.s-btns i:first-child { background: var(--grad); width: 68px; }

/* ---------- what's new ---------- */
.news { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.news-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.news-item:hover { border-color: var(--line2); transform: translateY(-3px); }
.news-item .ver {
  display: inline-block;
  font: 700 12px var(--font-mono);
  color: var(--accent2);
  background: var(--surface2);
  border: 1px solid var(--line2);
  border-radius: 8px;
  padding: 3px 9px;
  margin-bottom: 10px;
}
.news-item .dt { font: 500 11.5px var(--font-mono); color: var(--faint); display: block; margin-bottom: 8px; }
.news-item p { font-size: 14px; color: var(--muted); margin: 0; }
.news-more { margin-top: 22px; font-weight: 700; }

/* ---------- final cta ---------- */
.cta { padding: 86px 0; text-align: center; position: relative; overflow: hidden; }
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(44% 62% at 50% 55%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}
.cta h2 { position: relative; font-size: clamp(28px, 4.4vw, 46px); margin: 0 0 12px; }
.cta p { position: relative; color: var(--muted); max-width: 52ch; margin: 0 auto 28px; }
.cta .hero-ctas { position: relative; justify-content: center; margin: 0; }

/* ---------- footer ---------- */
.foot { flex-shrink: 0; background: var(--bg2); border-top: 1px solid var(--line); }
.foot-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1.1fr 1.5fr;
  gap: 34px;
  padding: 52px 0 38px;
}
.foot h4 {
  font: 600 11.5px var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--faint);
  margin: 4px 0 14px;
}
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: 9px; }
.foot ul a { color: var(--muted); font-size: 14px; }
.foot ul a:hover { color: var(--text); }
.foot-blurb { color: var(--muted); font-size: 14px; margin: 14px 0 12px; max-width: 34ch; }
.foot-meta { font: 500 11.5px var(--font-mono); color: var(--faint); margin: 0; }
.foot-note { font-size: 13px; color: var(--faint); line-height: 1.7; margin: 0; }
.foot-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  padding: 16px 0 20px;
  font: 500 12px var(--font-mono);
  color: var(--faint);
}

/* ---------- downloads ---------- */
.os-banner {
  display: flex;
  align-items: center;
  gap: 13px;
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--line2);
  border-radius: 14px;
  padding: 14px 18px;
  margin-bottom: 28px;
  cursor: pointer;
  color: var(--text);
  font: 600 14.5px var(--font-body);
  text-align: left;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.os-banner:hover { border-color: var(--accent); transform: translateY(-2px); }
.os-banner .oi { font-size: 20px; }
.os-banner .arrow { margin-left: auto; color: var(--accent2); font-family: var(--font-mono); }
.rel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 16px;
  padding: 20px 24px;
  margin-bottom: 34px;
}
.rel-head .lbl { font: 600 11px var(--font-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--faint); }
.rel-head .ver-big { font-family: var(--font-display); font-size: 24px; font-weight: 600; margin: 4px 0 2px; }
.rel-head .dt { font: 500 12px var(--font-mono); color: var(--faint); }
.rel-head .rhs { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.os-sec { margin: 36px 0; }
.os-sec h2 { font-family: var(--font-body); font-weight: 800; font-size: 20px; margin: 0 0 14px; display: flex; align-items: center; gap: 10px; }
.os-sec h2 .oi { font-size: 22px; }
.dl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(235px, 1fr)); gap: 12px; }
.dl {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 17px 18px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.dl:hover { border-color: var(--line2); transform: translateY(-2px); }
.dl .t { font-weight: 800; font-size: 15px; }
.dl .d { font-size: 13px; color: var(--muted); margin: 0; }
.dl .btn { margin-top: auto; }
.dl .miss { font: 500 11px var(--font-mono); color: var(--faint); }
.dl.off { opacity: 0.5; }
@keyframes flashbox {
  0%, 100% { box-shadow: 0 0 0 0 rgba(242, 85, 85, 0); }
  30% { box-shadow: 0 0 0 5px var(--accent-soft); }
}
.flash { animation: flashbox 1.3s ease 2; }

/* ---------- install guide ---------- */
.guide { display: grid; grid-template-columns: 210px 1fr; gap: 48px; align-items: start; }
.toc { position: sticky; top: 86px; }
.toc h4 { font: 600 11px var(--font-mono); text-transform: uppercase; letter-spacing: 0.16em; color: var(--faint); margin: 0 0 12px; }
.toc a {
  display: block;
  padding: 6px 0 6px 14px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--muted);
  border-left: 2px solid var(--line);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.toc a:hover { color: var(--text); text-decoration: none; }
.toc a.on { color: var(--accent); border-color: var(--accent); }
.os-panel { display: none; }
.os-panel.show { display: block; animation: fadein 0.35s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.callout {
  display: flex;
  gap: 12px;
  background: var(--surface2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent2);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--muted);
  margin: 16px 0;
}
.callout b { color: var(--text); }

/* ---------- sync page ---------- */
.duo {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: center;
  margin: 34px 0 8px;
}
.device {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 18px;
  padding: 30px 22px 26px;
  text-align: center;
  cursor: default;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.device:hover, .device:focus-visible, .device.tapped {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.device .ico { font-size: 42px; line-height: 1; display: block; margin-bottom: 12px; }
.device h3 { font-family: var(--font-body); font-weight: 800; font-size: 17px; margin: 0 0 4px; }
.device .sub2 { font: 500 12px var(--font-mono); color: var(--faint); }
.tip {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(5px);
  width: 250px;
  background: var(--bg2);
  border: 1px solid var(--line2);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10;
  box-shadow: var(--shadow);
}
.tip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 7px solid transparent;
  border-top-color: var(--line2);
}
.device:hover .tip, .device:focus-visible .tip, .device.tapped .tip { opacity: 1; transform: translateX(-50%) translateY(0); }
.duo-mid {
  position: relative;
  height: 2px;
  width: min(200px, 40vw);
  background: repeating-linear-gradient(90deg, var(--line2) 0 8px, transparent 8px 16px);
}
.duo-mid .pd {
  position: absolute;
  top: -4px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--grad);
  animation: pdot 2.2s linear infinite;
}
.duo-mid .pd.back { animation-name: pdotb; animation-delay: 1.1s; }
.relay-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
  background: var(--surface2);
  border: 1px solid var(--line2);
  border-radius: 999px;
  padding: 8px 8px 8px 16px;
  font: 500 12.5px var(--font-mono);
  color: var(--muted);
}
.relay-chip code { border: 0; background: none; padding: 0; color: var(--accent2); white-space: normal; }
.relay-chip .copy-btn { position: static; font-size: 10.5px; }

/* pairing demo */
.pair-demo {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 18px;
  padding: 26px;
  margin: 18px 0;
}
.pair-demo .plabel { font: 600 11px var(--font-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--faint); }
.pair-demo h3 { font-family: var(--font-body); font-weight: 800; font-size: 18px; margin: 6px 0 8px; letter-spacing: 0; }
.pair-demo .pstat { font: 500 12.5px var(--font-mono); color: var(--muted); margin: 0 0 14px; min-height: 20px; }
.pair-demo .pstat.live { color: var(--ok); }
.pair-code {
  font: 700 34px var(--font-mono);
  letter-spacing: 0.32em;
  margin: 0 0 16px;
  color: var(--text);
}
.pair-code .c { display: inline-block; opacity: 0; transform: translateY(8px); transition: opacity 0.3s ease, transform 0.3s ease; }
.pair-code .c.on { opacity: 1; transform: none; }
.pair-ctl { display: flex; gap: 10px; flex-wrap: wrap; }
.qrbox {
  width: 158px;
  aspect-ratio: 1;
  background: #f4f1ee;
  border-radius: 14px;
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  box-shadow: var(--shadow);
}
.qrbox .m { background: transparent; border-radius: 1px; }
.qrbox .m.on { background: #221b28; }
.pair-demo .qrnote { text-align: center; font: 500 10.5px var(--font-mono); color: var(--faint); margin-top: 10px; }

/* ---------- changelog timeline ---------- */
/* changelog toolbar: search + version selector */
.cl-tools {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 800px;
  margin-bottom: 30px;
  padding: 12px;
  border: 1px solid var(--line2);
  border-radius: 16px;
  background: var(--surface1);
}
.cl-search {
  flex: 1;
  min-width: 200px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--line2);
  background: var(--surface2);
  color: var(--text);
  font: 500 14px var(--font-ui);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.cl-search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(242, 85, 85, 0.18); }
.cl-search::placeholder { color: var(--faint); }
.cl-sellabel { font-size: 13px; font-weight: 600; color: var(--muted); }
.cl-select {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--line2);
  background: var(--surface2);
  color: var(--text);
  font: 600 13.5px var(--font-ui);
  outline: none;
  cursor: pointer;
  max-width: 260px;
}
.cl-select:focus { border-color: var(--accent); }

.tl { position: relative; padding-left: 30px; max-width: 800px; }
.tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}
.tl-item { position: relative; padding-bottom: 38px; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 0 4px var(--bg);
}
.tl-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.tl-ver {
  font: 700 13px var(--font-mono);
  color: var(--accent2);
  background: var(--surface2);
  border: 1px solid var(--line2);
  border-radius: 8px;
  padding: 4px 10px;
}
.tl-date { font: 500 12px var(--font-mono); color: var(--faint); }
.tl-body { color: var(--muted); font-size: 14.5px; }
.tl-body p { margin: 0 0 10px; }
.tl-body ul, .tl-body ol { margin: 0 0 10px; padding-left: 20px; }
.tl-body li { margin-bottom: 5px; }
.tl-body .mdh { font-weight: 800; color: var(--text); font-size: 15px; margin: 14px 0 8px; }
.tl-body code { white-space: normal; }
.tl-more { display: inline-block; margin-top: 4px; font-weight: 700; font-size: 13.5px; }

/* ---------- errors page ---------- */
.err-tools { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 26px; }
.err-search {
  flex: 1;
  min-width: 240px;
  max-width: 440px;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--text);
  font: 500 14px var(--font-mono);
  transition: border-color 0.15s ease;
}
.err-search:focus { outline: none; border-color: var(--accent); }
.err-count { font: 500 12px var(--font-mono); color: var(--faint); }
.err-legend { display: flex; gap: 8px; }
.err-legend .chip .sw { display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 6px; }
.err-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.err {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 17px 19px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.err:hover { border-color: var(--line2); transform: translateY(-2px); }
.err.hide { display: none; }
.err .top { display: flex; align-items: center; gap: 10px; margin-bottom: 9px; flex-wrap: wrap; }
.err .code {
  font: 700 12.5px var(--font-mono);
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--amber-soft);
  color: var(--accent2);
}
.err.vivi .code { background: var(--accent-soft); color: var(--accent); }
.err .scope { font: 600 10.5px var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--faint); }
.err h4 { font: 800 14px var(--font-body); letter-spacing: 0; margin: 0 0 6px; word-break: break-word; }
.err p { font-size: 13.5px; color: var(--muted); margin: 0 0 8px; }
.err .fix { color: var(--text); }
.err .fix b { color: var(--accent2); font-family: var(--font-mono); font-size: 12px; }
.err-empty { display: none; padding: 40px 0; text-align: center; color: var(--faint); font-family: var(--font-mono); font-size: 13.5px; }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 330px 1fr; gap: 44px; align-items: start; }
.glance {
  position: sticky;
  top: 86px;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 16px;
  padding: 22px;
}
.glance h3 { font-family: var(--font-body); font-weight: 800; font-size: 14px; letter-spacing: 0; margin: 0 0 14px; }
.glance .row { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 13.5px; }
.glance .row:last-child { border-bottom: 0; }
.glance .k { font: 600 11px var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--faint); padding-top: 2px; }
.glance .v { font-weight: 700; text-align: right; }
.glance .v a { color: var(--accent); font-weight: 600; }

/* ---------- reveal on scroll ---------- */
.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-right { max-width: 560px; }
  .hero-right .ghost { right: 0; font-size: 110px; }
  .band-grid { grid-template-columns: 1fr; gap: 30px; }
  .guide { grid-template-columns: 1fr; gap: 30px; }
  .toc { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 34px; }
  .glance { position: static; }
  .shots { grid-template-columns: 1fr 1fr; }
  .news { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .bento { grid-template-columns: 1fr 1fr; }
  .b1, .b4 { grid-column: span 2; }
  .b2, .b3 { grid-column: span 1; }
  .duo { grid-template-columns: 1fr; }
  .duo-mid { width: 2px; height: 44px; margin: 0 auto; background: repeating-linear-gradient(180deg, var(--line2) 0 8px, transparent 8px 16px); }
  .duo-mid .pd, .duo-mid .pd.back { display: none; }
  .tip { position: static; transform: none; width: auto; opacity: 1; pointer-events: auto; box-shadow: none; margin-top: 12px; }
  .tip::after { display: none; }
  .pair-demo { grid-template-columns: 1fr; }
  .qrbox { margin: 0 auto; }
}
@media (max-width: 620px) {
  .section { padding: 54px 0; }
  .shots { grid-template-columns: 1fr; }
  .news { grid-template-columns: 1fr; }
  .bento { grid-template-columns: 1fr; }
  .b1, .b4, .b2, .b3 { grid-column: span 1; }
  .mini-chip { left: 6px; bottom: 12px; }
  .reqs .row { grid-template-columns: 1fr; gap: 4px; }
  .foot-grid { grid-template-columns: 1fr; gap: 26px; }
  .foot-bar { justify-content: center; text-align: center; }
  .rel-head { flex-direction: column; align-items: flex-start; }
}

/* ---------- device-based responsive (phone / tablet via UA) ----------
   The layout follows the *device*, not just the viewport: a phone gets the
   full stacked mobile layout even when mirrored on a big external screen,
   while tablets and foldables degrade to desktop. The media queries above
   stay as a viewport fallback for desktop windows narrower than the
   breakpoints. */
.vm-phone .nav-toggle { display: inline-block; }
.vm-phone .nav-links {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  background: var(--bg2);
  border-bottom: 1px solid var(--line);
  padding: 14px 20px 20px;
}
.vm-phone .nav.open .nav-links { display: flex; }
.vm-phone .nav-links a { padding: 11px 14px; border-radius: 10px; }
.vm-phone .nav-links .nav-gh { margin: 4px 0 0; text-align: center; }

.vm-phone .hero-grid { grid-template-columns: 1fr; gap: 44px; }
.vm-phone .hero-right { max-width: 560px; }
.vm-phone .band-grid { grid-template-columns: 1fr; gap: 30px; }
.vm-phone .guide { grid-template-columns: 1fr; gap: 30px; }
.vm-phone .toc { display: none; }
.vm-phone .about-grid { grid-template-columns: 1fr; gap: 34px; }
.vm-phone .glance { position: static; }
.vm-phone .shots { grid-template-columns: 1fr 1fr; }
.vm-phone .news { grid-template-columns: 1fr 1fr; }
.vm-phone .foot-grid { grid-template-columns: 1fr 1fr; }

.vm-phone .bento { grid-template-columns: 1fr 1fr; }
.vm-phone .b1, .vm-phone .b4 { grid-column: span 2; }
.vm-phone .b2, .vm-phone .b3 { grid-column: span 1; }
.vm-phone .duo { grid-template-columns: 1fr; }
.vm-phone .duo-mid { width: 2px; height: 44px; margin: 0 auto; background: repeating-linear-gradient(180deg, var(--line2) 0 8px, transparent 8px 16px); }
.vm-phone .duo-mid .pd, .vm-phone .duo-mid .pd.back { display: none; }
.vm-phone .tip { position: static; transform: none; width: auto; opacity: 1; pointer-events: auto; box-shadow: none; margin-top: 12px; }
.vm-phone .tip::after { display: none; }
.vm-phone .pair-demo { grid-template-columns: 1fr; }
.vm-phone .qrbox { margin: 0 auto; }

.vm-phone .section { padding: 54px 0; }
.vm-phone .shots { grid-template-columns: 1fr; }
.vm-phone .news { grid-template-columns: 1fr; }
.vm-phone .bento { grid-template-columns: 1fr; }
.vm-phone .b1, .vm-phone .b4, .vm-phone .b2, .vm-phone .b3 { grid-column: span 1; }
.vm-phone .reqs .row { grid-template-columns: 1fr; gap: 4px; }
.vm-phone .foot-grid { grid-template-columns: 1fr; gap: 26px; }
.vm-phone .foot-bar { justify-content: center; text-align: center; }
.vm-phone .rel-head { flex-direction: column; align-items: flex-start; }

/* tablets / foldables: keep desktop layout but drop the two-pane guide */
.vm-tablet .guide { grid-template-columns: 1fr; gap: 30px; }
.vm-tablet .toc { display: none; }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .ticker-track { animation: none; }
  .disc, .shot .frame .s-disc { animation: none; }
}