/* Headphone Check — site styles. Look follows the Headphone Sound Check app icon:
   signal orange on near-black, cream frame, hazard stripes, instrument read-outs. */
:root {
  --brand: #FD5121;
  --brand-ink: #C93A10;
  --ok: #2FB46E;
  --bad: #E5484D;
  --bg: #F4EFE6;
  --fg: #141210;
  --fg-2: #5a554d;
  --fg-3: #8b857b;
  --line: rgba(20, 18, 16, .12);
  --card: #FFFDF8;
  --panel: #121110;
  --panel-fg: #F4EFE6;
  --panel-line: rgba(244, 239, 230, .14);
  --shadow: 0 10px 30px rgba(20, 18, 16, .08);
  --radius: 18px;
  --col: 880px;            /* one column for header, tools, text and footer: edges line up */
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --stripes: repeating-linear-gradient(-45deg, var(--brand) 0 10px, #121110 10px 20px);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-ink: #FF7A50;
    --bg: #0D0C0A;
    --fg: #F4EFE6;
    --fg-2: #b3ab9f;
    --fg-3: #7e776c;
    --line: rgba(244, 239, 230, .12);
    --card: #181612;
    --panel: #181612;
    --shadow: 0 10px 30px rgba(0, 0, 0, .4);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body { margin: 0; font: 16px/1.6 var(--sans); color: var(--fg); background: var(--bg); overflow-x: clip; }
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-underline-offset: .15em; }
.prose a, .faq a, .legal a { color: var(--brand-ink); }
h1, h2, h3 { letter-spacing: -.02em; line-height: 1.15; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); font-weight: 800; }
h2 { font-size: clamp(1.4rem, 3vw, 1.85rem); margin-top: 1.8em; }
h3 { font-size: 1.15rem; margin-top: 1.4em; }
p, ul, ol { margin: 0 0 1em; }
.lead { font-size: 1.12rem; color: var(--fg-2); }
.muted { color: var(--fg-2); }
.small { font-size: .9rem; }
.wrap { width: min(100% - 32px, var(--col)); margin-inline: auto; }
.prose { width: min(100% - 32px, var(--col)); margin-inline: auto; }
.prose > h2:first-child { margin-top: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px 22px; }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--bg) 86%, transparent); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.site-header::before { content: ""; display: block; height: 4px; background: var(--stripes); }
.site-header .wrap { display: flex; align-items: center; gap: 14px; min-height: 58px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.1rem; letter-spacing: -.02em; text-decoration: none; min-height: 44px; }
.logo img { width: 30px; height: 30px; border-radius: 7px; }
.nav { margin-left: auto; display: flex; gap: 2px; }
.nav a { text-decoration: none; color: var(--fg-2); padding: 10px 12px; border-radius: 10px; font-weight: 600; font-size: .93rem; min-height: 44px; display: inline-flex; align-items: center; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--fg); background: var(--line); }
.nav-toggle { display: none; margin-left: auto; width: 44px; height: 44px; border: 0; background: none; color: var(--fg); border-radius: 12px; cursor: pointer; }
.nav-toggle svg { width: 24px; height: 24px; margin: auto; }
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .nav { display: none; position: absolute; left: 16px; right: 16px; top: 66px; flex-direction: column; padding: 8px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
  .nav.is-open { display: flex; }
  .nav a { padding: 12px 14px; }
}

/* ---------- breadcrumbs ---------- */
.crumbs { font-size: .88rem; color: var(--fg-2); padding: 14px 0 0; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 8px; }
.crumbs li + li::before { content: "›"; margin-right: 8px; color: var(--fg-3); }
.crumbs a { text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

/* ---------- test hero ---------- */
.hero { padding: 26px 0 8px; }
.hero h1 { margin-bottom: .25em; }
.hero .lead { max-width: 640px; }
.kicker { font: 700 .76rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--brand-ink); margin: 0 0 8px; }

/* the rig: a dark instrument panel */
.rig { position: relative; margin: 18px 0 8px; padding: 22px; border-radius: 24px; background: var(--panel); color: var(--panel-fg); box-shadow: 0 18px 44px rgba(20, 18, 16, .22); border: 2px solid #E9DFC9; }
@media (prefers-color-scheme: dark) { .rig { border-color: #3a352c; } }
.rig::after { content: ""; position: absolute; left: 22px; right: 22px; top: -2px; height: 4px; border-radius: 0 0 4px 4px; background: var(--stripes); opacity: .9; }
.stage { display: grid; grid-template-columns: 74px 1fr 74px; align-items: center; gap: 14px; margin: 6px 0 16px; }
.cup { height: 92px; border-radius: 18px; border: 2px solid var(--panel-line); display: grid; place-items: center; font: 800 1.6rem var(--mono); color: rgba(244, 239, 230, .35); transition: background .15s, color .15s, box-shadow .15s, border-color .15s; }
.cup.on { background: var(--brand); border-color: var(--brand); color: #121110; box-shadow: 0 0 0 6px rgba(253, 81, 33, .18), 0 0 34px rgba(253, 81, 33, .55); }
.axis { position: relative; height: 4px; border-radius: 4px; background: var(--panel-line); }
.axis::before { content: ""; position: absolute; left: 50%; top: -8px; width: 2px; height: 20px; background: var(--panel-line); }
.axis i { position: absolute; top: 50%; width: 18px; height: 18px; margin: -9px 0 0 -9px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 18px rgba(253, 81, 33, .8); transition: left .06s linear; }
.readout { font: 500 .95rem/1.5 var(--mono); color: rgba(244, 239, 230, .78); min-height: 3em; margin: 0 0 14px; padding: 12px 14px; border-radius: 12px; background: rgba(244, 239, 230, .05); border: 1px solid var(--panel-line); }
.readout[data-tone="play"] { color: var(--panel-fg); border-color: rgba(253, 81, 33, .5); }
.readout[data-tone="ok"] { color: #8ce0b0; border-color: rgba(47, 180, 110, .5); }
.readout[data-tone="alert"] { color: #ff9b9e; }
.pads { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.pad { min-height: 56px; padding: 10px 14px; border-radius: 14px; border: 1px solid var(--panel-line); background: rgba(244, 239, 230, .06); color: var(--panel-fg); font: 700 .98rem var(--sans); cursor: pointer; text-align: left; display: flex; flex-direction: column; justify-content: center; gap: 2px; transition: background .12s, border-color .12s, transform .1s; }
.pad small { font: 500 .74rem var(--mono); color: rgba(244, 239, 230, .55); letter-spacing: .02em; }
.pad:hover { border-color: rgba(253, 81, 33, .7); }
.pad:active { transform: scale(.98); }
.pad.is-playing { background: var(--brand); border-color: var(--brand); color: #121110; }
.pad.is-playing small { color: rgba(18, 17, 16, .7); }
.pad-main { grid-column: 1 / -1; width: 100%; min-height: 64px; font-size: 1.1rem; background: var(--brand); color: #121110; border-color: var(--brand); text-align: center; align-items: center; }
.pad-main small { color: rgba(18, 17, 16, .65); }
.rig-foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-top: 14px; }
.stop { min-height: 44px; padding: 8px 20px; border-radius: 999px; border: 1px solid var(--panel-line); background: transparent; color: var(--panel-fg); font: 700 .92rem var(--sans); cursor: pointer; }
.stop:hover { border-color: var(--panel-fg); }
.rig-note { font-size: .82rem; color: rgba(244, 239, 230, .55); margin: 0; }
.seg { display: inline-flex; padding: 3px; border-radius: 999px; border: 1px solid var(--panel-line); margin-bottom: 12px; }
.seg button { border: 0; background: none; color: rgba(244, 239, 230, .65); font: 600 .85rem var(--sans); padding: 8px 14px; border-radius: 999px; cursor: pointer; min-height: 38px; }
.seg button[aria-pressed="true"] { background: var(--panel-fg); color: #121110; }
.rig .sub { font: 700 .74rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: rgba(244, 239, 230, .5); margin: 18px 0 8px; }
.progress { height: 6px; border-radius: 6px; background: var(--panel-line); overflow: hidden; margin: -4px 0 14px; }
.progress i { display: block; height: 100%; width: calc(var(--progress, 0) * 100%); background: var(--brand); }
@media (max-width: 520px) {
  .rig { padding: 18px 14px; border-radius: 20px; }
  .stage { grid-template-columns: 56px 1fr 56px; }
  .cup { height: 72px; font-size: 1.3rem; }
  .pads { grid-template-columns: 1fr 1fr; }
}

/* guided check */
.check-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 4px; }
.check-count { font: 700 .76rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: rgba(244, 239, 230, .55); }
.dots { display: flex; gap: 6px; }
.dots i { width: 22px; height: 6px; border-radius: 6px; background: var(--panel-line); }
.dots i.now { background: var(--panel-fg); }
.dots i.ok { background: var(--ok); }
.dots i.bad { background: var(--bad); }
.check-title { font-size: clamp(1.5rem, 4vw, 2rem); font-weight: 800; margin: 2px 0 4px; }
.check-ask { color: rgba(244, 239, 230, .78); margin: 0 0 14px; min-height: 1.6em; }
.answers { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }
.answers button { min-height: 52px; border-radius: 14px; font: 700 1rem var(--sans); cursor: pointer; border: 1px solid; }
.answers [data-answer="yes"] { background: rgba(47, 180, 110, .16); border-color: rgba(47, 180, 110, .6); color: #a6efc5; }
.answers [data-answer="no"] { background: rgba(229, 72, 77, .14); border-color: rgba(229, 72, 77, .55); color: #ffb3b5; }
.result-score { font: 800 clamp(3rem, 10vw, 4.6rem)/1 var(--mono); letter-spacing: -.04em; color: var(--brand); margin: 4px 0 8px; }
.result-list { list-style: none; padding: 0; margin: 14px 0; display: grid; gap: 6px; }
.result-list li { padding: 8px 12px 8px 36px; border-radius: 10px; background: rgba(244, 239, 230, .05); position: relative; }
.result-list li::before { position: absolute; left: 12px; font-weight: 800; }
.result-list li.ok::before { content: "✓"; color: var(--ok); }
.result-list li.bad::before { content: "✕"; color: var(--bad); }
.result-list a { color: #ffb08f; }
.result-app { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--panel-line); }
.result-app p { margin: 0 0 10px; color: rgba(244, 239, 230, .78); }

/* tone generator */
.gen { display: grid; gap: 10px; margin-top: 6px; }
.gen-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.gen output { font: 800 clamp(2rem, 7vw, 3rem)/1 var(--mono); letter-spacing: -.03em; color: var(--brand); min-width: 5.5ch; }
.gen input[type=range] { width: 100%; accent-color: var(--brand); height: 32px; }

/* surround ring */
.ring { position: relative; width: min(100%, 420px); aspect-ratio: 1; margin: 6px auto 18px; border-radius: 50%; border: 1px dashed var(--panel-line); }
.ring .head { position: absolute; left: 50%; top: 50%; width: 54px; height: 54px; margin: -27px 0 0 -27px; border-radius: 50%; background: rgba(244, 239, 230, .1); display: grid; place-items: center; font: 700 .7rem var(--mono); color: rgba(244, 239, 230, .6); }
.ring .head::before { content: ""; position: absolute; top: -8px; left: 50%; margin-left: -6px; border: 6px solid transparent; border-bottom: 8px solid rgba(244, 239, 230, .35); }
.spk { position: absolute; width: 56px; min-height: 44px; margin: -22px 0 0 -28px; border-radius: 12px; border: 1px solid var(--panel-line); background: #1d1b17; color: var(--panel-fg); font: 800 .82rem var(--mono); cursor: pointer; }
.spk.on, .spk.is-playing { background: var(--brand); border-color: var(--brand); color: #121110; box-shadow: 0 0 24px rgba(253, 81, 33, .6); }

/* ---------- content ---------- */
.section { padding: 34px 0; }
.section-tight { padding: 18px 0; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.tile { display: block; padding: 18px 20px; text-decoration: none; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); transition: border-color .15s, transform .15s; }
.tile:hover { border-color: var(--brand); transform: translateY(-1px); }
.tile h3 { margin: 0 0 6px; font-size: 1.05rem; }
.tile p { margin: 0; color: var(--fg-2); font-size: .93rem; }
.tile .tag { font: 700 .7rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--brand-ink); display: block; margin-bottom: 6px; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 0 1.2em; border-radius: 14px; border: 1px solid var(--line); }
table { border-collapse: collapse; width: 100%; font-size: .95rem; background: var(--card); }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 700 .74rem var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--fg-2); background: color-mix(in srgb, var(--fg) 4%, var(--card)); }
tr:last-child td { border-bottom: 0; }
td.num { font-family: var(--mono); font-weight: 700; white-space: nowrap; }
.answer { padding: 18px 22px; border-left: 4px solid var(--brand); margin: 0 0 1.4em; }
.answer p:last-child { margin: 0; }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps > li { counter-increment: s; position: relative; padding-left: 46px; margin-bottom: 16px; }
.steps > li::before { content: counter(s); position: absolute; left: 0; top: -2px; width: 32px; height: 32px; border-radius: 9px; background: var(--fg); color: var(--bg); font: 800 .95rem/32px var(--mono); text-align: center; }
.steps h3 { margin: 0 0 4px; }

/* FAQ */
.faq details { border-top: 1px solid var(--line); padding: 4px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; padding: 12px 0; list-style: none; display: flex; justify-content: space-between; gap: 12px; min-height: 44px; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 700 1.3rem var(--mono); color: var(--fg-3); }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--fg-2); margin: 0 0 12px; }

/* app store tiles: official badges, QR shown outright on desktop */
.app-tiles { display: flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.app-tile { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.app-tile__qr, .app-tile__cap { display: none; }
.store-badge { display: block; line-height: 0; border-radius: 9px; transition: transform .12s, box-shadow .2s; }
.store-badge svg { height: 48px; width: auto; display: block; }
.store-badge:hover, .store-badge:focus-visible { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(0,0,0,.18); }
@media (prefers-color-scheme: dark) { .store-badge { box-shadow: 0 0 0 .5px rgba(255,255,255,.25); } }
@media (min-width: 981px) {
  .app-tile { width: 228px; padding: 16px 14px 14px; border-radius: 18px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); color: #121110; }
  .app-tile__qr { display: block; width: 120px; height: 120px; }
  .app-tile__cap { display: block; font-size: .76rem; color: #5a554d; margin-top: -2px; }
}
.rig .app-tile { background: #fff; }

/* app promo block */
.promo { display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: center; padding: 24px; border-radius: 24px; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); }
.promo img.icon { width: 110px; height: 110px; border-radius: 26px; box-shadow: var(--shadow); }
.promo h2 { margin: 0 0 6px; }
.promo p { color: var(--fg-2); margin: 0 0 4px; }
.promo .app-tiles { margin-bottom: 0; }
@media (max-width: 640px) { .promo { grid-template-columns: 1fr; } .promo img.icon { width: 76px; height: 76px; border-radius: 18px; } }

/* app banner (mobile, fixed bottom) */
.app-banner { display: none; }
@media (max-width: 760px) {
  html[data-app-banner] body { padding-bottom: 92px; }
  .app-banner { display: flex; position: fixed; left: 12px; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom)); z-index: 40; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 18px; background: var(--panel); color: var(--panel-fg); box-shadow: 0 10px 30px rgba(0,0,0,.3); }
  .app-banner img { width: 48px; height: 48px; border-radius: 12px; flex: none; }
  .app-banner .ab-text { flex: 1; min-width: 0; }
  .app-banner b { display: block; font-size: .95rem; }
  .app-banner p { margin: 0; font-size: .78rem; color: rgba(244, 239, 230, .7); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .app-banner .btn { min-height: 40px; padding: 8px 16px; font-size: .9rem; flex: none; }
  .app-banner .ab-close { flex: none; width: 36px; height: 36px; border: 0; background: none; color: rgba(244, 239, 230, .55); font-size: 1.3rem; cursor: pointer; border-radius: 50%; }
}
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 12px 22px; border-radius: 999px; border: 1px solid var(--line); font: 700 1rem var(--sans); cursor: pointer; text-decoration: none; color: var(--fg); background: var(--card); }
.btn-brand { background: var(--brand); border-color: var(--brand); color: #121110; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* footer */
.site-footer { margin-top: 40px; border-top: 1px solid var(--line); padding: 30px 0 40px; font-size: .9rem; color: var(--fg-2); }
.site-footer .cols { display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.site-footer h4 { margin: 0 0 8px; font: 700 .74rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--fg-3); }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer a { text-decoration: none; display: inline-block; padding: 6px 0; min-height: 32px; }
.site-footer a:hover { text-decoration: underline; }
.site-footer .legal { margin-top: 24px; font-size: .82rem; color: var(--fg-3); }

/* misc */
.hero-simple { padding: 36px 0 10px; }
.article-meta { font-size: .85rem; color: var(--fg-3); margin: -4px 0 20px; }
.note { padding: 14px 18px; border-radius: 14px; background: color-mix(in srgb, var(--brand) 9%, var(--card)); border: 1px solid color-mix(in srgb, var(--brand) 35%, transparent); font-size: .95rem; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; }
.kv dt { font-weight: 700; } .kv dd { margin: 0; color: var(--fg-2); }
.related { margin-top: 30px; }
.related ul { list-style: none; padding: 0; display: grid; gap: 8px; }
.related li a { display: block; padding: 12px 16px; border-radius: 14px; border: 1px solid var(--line); text-decoration: none; background: var(--card); color: var(--fg); }
.related li a:hover { border-color: var(--brand); }
.app-hero { padding: 30px 0 6px; }
.app-hero__head { display: flex; align-items: center; gap: 22px; margin-bottom: 14px; }
.app-hero__head h1 { margin: 0; }
.app-hero img.icon { width: 96px; height: 96px; border-radius: 22px; box-shadow: var(--shadow); flex: none; }
@media (max-width: 560px) { .app-hero__head { gap: 14px; } .app-hero img.icon { width: 64px; height: 64px; border-radius: 15px; } }
.feature-list { list-style: none; padding: 0; display: grid; gap: 10px; }
.feature-list li { padding-left: 28px; position: relative; }
.feature-list li::before { content: ""; position: absolute; left: 2px; top: .5em; width: 12px; height: 12px; border-radius: 3px; background: var(--brand); }
[hidden] { display: none !important; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }
.byline { font-size: .86rem; color: var(--fg-3); margin: -2px 0 14px; }
.byline a { color: var(--fg-2); font-weight: 600; text-decoration: none; }
.byline a:hover { text-decoration: underline; }