/* Background Audio Remover — site styles (approved design direction A "Bright", 2026-11-02)
   参考：refs/upload-zone-x（虚线上传区、等宽状态字、刻度进度条）、refs/audio-player-collectui（白卡 + 波形即进度条 + 胶囊播放键）
   外部参考：cleanaudio.io（清爽首屏、Original/Enhanced 切换、波形播放进度）、simpleclean.app（大虚线上传框）
   颜色按 DESIGN.md §2.1，一个品牌色：只改 --brand 即可换色（其余强调色由它混出）；圆角一套 8/12/16/24/999。 */
@font-face { font-family: "Geist"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(/assets/fonts/geist-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Geist"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(/assets/fonts/geist-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Geist Mono"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(/assets/fonts/geist-mono-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+2000-206F; }
:root {
  --bg: #FFFFFF;
  --bg-subtle: #F7F8FA;
  --surface: #FFFFFF;
  --text: #171717;
  --text-2: #5C5C5C;
  --text-3: #767676;
  --line: rgba(0,0,0,.08);
  --line-strong: rgba(0,0,0,.18);
  /* the one accent colour (teal; orange #C2410C or rose #BE185D also tested). Everything below derives from it. */
  --brand: #0F766E;
  --brand-ink: color-mix(in srgb, var(--brand) 82%, #000);
  --brand-soft: color-mix(in srgb, var(--brand) 10%, #fff);
  --drop-bg: color-mix(in srgb, var(--brand) 4%, #fff);
  --drop-line: color-mix(in srgb, var(--brand) 36%, #fff);
  --panel: var(--brand-soft);
  --noise-played: color-mix(in srgb, var(--brand) 26%, #E9ECF1);
  --ok: #15803D;
  --bad: #B42318;
  --wave-played: var(--brand);
  --wave-rest: #DADFE8;
  --playhead: var(--brand);
  --shadow-card: 0 0 0 1px rgba(0,0,0,.06), 0 1px 1px -.5px rgba(0,0,0,.06), 0 3px 3px -1.5px rgba(0,0,0,.06), 0 12px 24px -12px rgba(0,0,0,.08);
  --shadow-pop: 0 0 0 1px rgba(0,0,0,.08), 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);
  --r-sm: 8px; --r: 12px; --r-lg: 16px; --r-xl: 24px;
  --font: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 16px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--brand); text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, p { margin: 0; }
svg { display: block; }
.mono { font-family: var(--mono); font-size: 12px; line-height: 1.4; letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); }
.label { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); margin-bottom: 12px; }
.small { font-size: 14px; line-height: 1.5; color: var(--text-2); }

/* state switching */
body[data-state=landing] [data-view]:not([data-view~=landing]),
body[data-state=processing] [data-view]:not([data-view~=processing]),
body[data-state=result] [data-view]:not([data-view~=result]) { display: none !important; }
[hidden] { display: none !important; }
.stage, .hero { animation: rise .22s ease-out; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } }
@media (prefers-reduced-motion: reduce) { *, *::before { animation: none !important; transition: none !important; } html { scroll-behavior: auto; } }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.88); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.nav__in { max-width: 1760px; margin: 0 auto; height: 64px; padding: 0 24px; display: flex; align-items: center; gap: 32px; }
.logo { display: inline-flex; align-items: center; gap: 8px; color: var(--text); font-weight: 600; font-size: 18px; letter-spacing: -.01em; }
.logo svg { width: 28px; height: 28px; }
.nav__links { display: flex; gap: 28px; margin: 0 auto; }
.nav__links a { color: var(--text-2); font-size: 15px; font-weight: 500; }
.nav__links a:hover { color: var(--text); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 44px; padding: 0 24px; border-radius: var(--r); background: var(--brand); color: #fff; font-weight: 600; font-size: 16px; transition: background .15s, transform .15s; }
.btn:hover { background: var(--brand-ink); transform: translateY(-1px); }
.btn svg { width: 20px; height: 20px; }
.btn--sm { height: 40px; padding: 0 16px; font-size: 15px; }
.btn--lg { height: 52px; padding: 0 28px; font-size: 17px; }
.btn--block { width: 100%; }
.chip { height: 32px; padding: 0 14px; border-radius: 999px; background: var(--bg); box-shadow: 0 0 0 1px var(--line-strong); font-size: 14px; font-weight: 500; color: var(--text); }
.chip:hover { box-shadow: 0 0 0 1px var(--brand); color: var(--brand); }
.iconbtn { width: 40px; height: 40px; border-radius: var(--r); display: grid; place-items: center; color: var(--text-3); }
.iconbtn:hover { background: var(--bg-subtle); color: var(--text); }
.iconbtn svg { width: 20px; height: 20px; }

/* layout: 300 | 720 | 300 on wide screens */
.shell { max-width: 1760px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: minmax(0, 720px); justify-content: center; gap: 56px; }
.side { display: none; }
@media (min-width: 1600px) {
  .shell { grid-template-columns: 300px minmax(0, 720px) 300px; }
  .side { display: block; }
  .side__sticky { position: sticky; top: 104px; padding-top: 72px; display: grid; gap: 16px; }
  .side__sticky > div { display: grid; gap: 16px; align-content: start; }
}
.main { min-width: 0; padding-bottom: 32px; }

.card { background: var(--surface); border-radius: var(--r-xl); box-shadow: var(--shadow-card); }

/* hero + tool */
.hero { padding: 64px 0 0; text-align: center; }
.hero h1 { font-size: 56px; line-height: 1.08; font-weight: 650; letter-spacing: -.03em; }
.hero h1 span { display: block; margin-top: 8px; font-size: 30px; line-height: 1.2; letter-spacing: -.015em; color: var(--text-3); font-weight: 500; }
.lead { font-size: 19px; line-height: 1.5; color: var(--text-2); margin: 16px auto 0; max-width: 560px; }
.lead--left { margin: 12px 0 0; max-width: none; }
.tool { margin-top: 40px; padding: 12px; text-align: center; }
.drop { border: 2px dashed var(--drop-line); background: var(--drop-bg); border-radius: var(--r-lg); padding: 40px 24px 32px; display: grid; justify-items: center; gap: 8px; cursor: pointer; transition: border-color .15s, background .15s; outline: none; }
.drop:hover, .drop:focus-visible, .drop.is-over { border-color: var(--brand); background: var(--brand-soft); }
.drop__icon { width: 56px; height: 56px; border-radius: 999px; background: #fff; box-shadow: var(--shadow-card); display: grid; place-items: center; color: var(--brand); margin-bottom: 8px; }
.drop__icon svg { width: 26px; height: 26px; }
.drop__title { font-size: 24px; font-weight: 600; letter-spacing: -.01em; }
.drop__sub { color: var(--text-3); font-size: 14px; }
.drop__meta { margin-top: 12px; }
.samples { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 8px; padding: 16px 8px 8px; font-size: 14px; color: var(--text-2); }
.trust { list-style: none; padding: 0; margin: 24px 0 0; display: flex; justify-content: center; gap: 28px; flex-wrap: wrap; font-size: 14px; font-weight: 500; color: var(--text-2); }
.trust li { display: flex; align-items: center; gap: 8px; }
.trust svg { width: 20px; height: 20px; color: var(--ok); }
.hero__sub { margin: 12px auto 0; max-width: 620px; font-size: 22px; line-height: 1.35; font-weight: 500; letter-spacing: -.01em; color: var(--text-3); }
.hero__sub b { color: var(--text-2); font-weight: 500; }
.model { display: block; margin-top: 4px; font: 400 12px/1.4 var(--mono); letter-spacing: .04em; color: var(--text-3); }
.model.is-ok { color: var(--ok); }
.model.is-bad { color: var(--bad); }
.notice { margin: 12px 8px 4px; padding: 16px; border-radius: var(--r-lg); background: #FEF3F2; color: #7A271A; text-align: left; font-size: 15px; line-height: 1.5; }
.notice__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; align-items: center; }
.notice__actions .chip { height: 40px; }
kbd { display: inline-block; font: 500 12px/20px var(--mono); padding: 0 4px; border-radius: var(--r-sm); box-shadow: inset 0 0 0 1px var(--line-strong); color: var(--text-2); }
.is-audio .video { display: none; }
.result-note { margin-top: 16px; padding: 12px 16px; border-radius: var(--r); background: var(--bg-subtle); box-shadow: inset 3px 0 0 var(--bad); color: var(--text-2); font-size: 14px; }
.playerr { margin: 12px; font-size: 14px; color: var(--bad); }

/* stages */
.stage { padding: 40px 0 0; }
.kicker { display: flex; align-items: center; gap: 8px; }
.kicker svg { width: 16px; height: 16px; }
.kicker--ok { color: var(--ok); }
.stage__title { font-size: 36px; line-height: 1.1; font-weight: 650; letter-spacing: -.02em; margin-top: 12px; }
.stage__title--big { font-size: 48px; letter-spacing: -.03em; }
.hint { font-size: 14px; color: var(--text-3); margin-top: 16px; text-align: center; }
.titlerow { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; }
.quickdl { flex: none; margin-bottom: 2px; }
.mobilebar { display: none; }

/* processing */
.proc { margin-top: 24px; padding: 24px; }
.filerow { display: flex; align-items: center; gap: 12px; padding: 12px; border-radius: var(--r-lg); box-shadow: 0 0 0 1px var(--line); }
.filerow__icon { width: 44px; height: 44px; border-radius: var(--r); background: var(--brand-soft); color: var(--brand); display: grid; place-items: center; flex: none; }
.filerow__icon svg { width: 22px; height: 22px; }
.filerow__txt { display: grid; min-width: 0; flex: 1; }
.filerow__txt b { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.proc__num { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-top: 32px; }
.proc__pct { font: 500 64px/1 var(--mono); letter-spacing: -.04em; color: var(--text); font-variant-numeric: tabular-nums; }
.proc__eta { font-size: 18px; font-weight: 500; color: var(--text-2); }
.ticks { --p: .5; height: 24px; margin-top: 16px; border-radius: 4px;
  background: repeating-linear-gradient(90deg, currentColor 0 3px, transparent 3px 7px);
  color: var(--wave-rest); position: relative; overflow: hidden; }
.ticks::after { content: ""; position: absolute; inset: 0; right: calc((1 - var(--p)) * 100%);
  background: repeating-linear-gradient(90deg, var(--brand) 0 3px, transparent 3px 7px); transition: right .1s linear; }
.steps { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.steps li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--text-3); }
.steps li::before { content: ""; width: 20px; height: 20px; border-radius: 999px; box-shadow: inset 0 0 0 1.5px var(--line-strong); flex: none; }
.steps li[data-status=now] { color: var(--text); font-weight: 500; }
.steps li[data-status=now]::before { box-shadow: inset 0 0 0 2px var(--brand); background: radial-gradient(circle, var(--brand) 0 4px, transparent 5px); }
.steps li[data-status=done] { color: var(--text-2); }
.steps li[data-status=done]::before { background: var(--ok) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='m6 12.5 4 4 8-8.5' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat; box-shadow: none; }

/* result player */
.player { margin-top: 20px; padding: 12px; }
.video { position: relative; border-radius: var(--r-lg); overflow: hidden; background: #0F172A; aspect-ratio: 16 / 9; max-height: 340px; width: 100%; }
.video video { width: 100%; height: 100%; object-fit: contain; display: block; }
.video__play { position: absolute; left: 16px; bottom: 16px; width: 48px; height: 48px; border-radius: 999px; background: rgba(255,255,255,.92); color: var(--brand); display: grid; place-items: center; box-shadow: var(--shadow-pop); transition: opacity .2s; }
.video__play svg { width: 22px; height: 22px; }
.is-playing .video__play { opacity: 0; }
.is-playing .video:hover .video__play { opacity: 1; }
.i-pause { display: none !important; }
.is-playing .i-pause { display: block !important; }
.is-playing .i-play { display: none !important; }
/* before/after demo: its own play state, independent of the result player's body.is-playing */
.demo { margin-top: 24px; padding: 4px 12px 16px; }
.demo:not(.is-playing) .i-pause { display: none !important; }
.demo:not(.is-playing) .i-play { display: block !important; }
.demo .seg button[data-demo-mode=clean][aria-pressed=true] { background: var(--brand); color: #fff; box-shadow: none; }
.demo__bar { margin: 12px 12px 0; height: 6px; border-radius: 999px; background: var(--wave-rest); cursor: pointer; overflow: hidden; }
.demo__bar span { display: block; height: 100%; width: 0; background: var(--brand); border-radius: inherit; }
.demo__src { margin: 14px 12px 0; font-size: 11px; text-transform: none; letter-spacing: .02em; }
.player__bar { display: flex; align-items: center; gap: 12px; padding: 20px 12px 8px; }
.pill { width: 72px; height: 48px; border-radius: 999px; background: var(--surface); box-shadow: 0 0 0 1px var(--line-strong); color: var(--brand); display: grid; place-items: center; flex: none; }
.pill:hover { box-shadow: 0 0 0 1px var(--brand); }
.pill svg { width: 22px; height: 22px; }
.is-busy { opacity: .5; }
.seg { display: inline-flex; padding: 4px; border-radius: 999px; background: var(--bg-subtle); box-shadow: inset 0 0 0 1px var(--line); }
.seg button { height: 40px; padding: 0 20px; border-radius: 999px; font-weight: 600; font-size: 15px; color: var(--text-2); transition: background .15s, color .15s; }
.seg button[aria-pressed=true] { background: var(--surface); color: var(--text); box-shadow: 0 0 0 1px var(--line), 0 1px 3px rgba(0,0,0,.08); }
.seg button[data-mode=clean][aria-pressed=true] { background: var(--brand); color: #fff; box-shadow: none; }
.seg--sm button { height: 36px; padding: 0 14px; font-size: 14px; }
.time { margin-left: auto; color: var(--text-2); font-variant-numeric: tabular-nums; }
.wave { padding: 8px 12px 0; }
.wave canvas { display: block; width: 100%; height: 72px; cursor: pointer; }
.wave__noise { display: flex; align-items: center; gap: 12px; margin-top: 4px; }
.wave__noise .mono { font-size: 10px; flex: none; }
/* flex: 1 + min-width: 0, or the canvas' pixel width (CSS width × devicePixelRatio) would push the row wider every redraw */
.wave canvas.noise { flex: 1; min-width: 0; width: 0; height: 20px; --wave-played: var(--noise-played); --wave-rest: #E9ECF1; cursor: default; }
.warmth { margin: 16px 12px 0; padding: 20px 0 0; border-top: 1px solid var(--line); }
.warmth__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.warmth label { display: grid; gap: 2px; }
.warmth label span { font-size: 14px; color: var(--text-2); }
.warmth__status { color: var(--brand); padding-top: 4px; text-align: right; }
.seg--opts { margin-top: 16px; display: flex; width: 100%; }
.seg--opts button { flex: 1; padding: 0 8px; }
.seg--opts button[aria-pressed=true] { background: var(--brand); color: #fff; box-shadow: none; }
.dl { margin: 20px 12px 8px; padding-top: 20px; border-top: 1px solid var(--line); text-align: center; }
.dl__meta { margin-top: 12px; }
.dl__more { display: flex; justify-content: center; gap: 24px; margin-top: 12px; font-size: 15px; font-weight: 500; }


/* below the fold */
.sec { padding: 96px 0 0; }
.sec h2 { font-size: 40px; line-height: 1.12; font-weight: 650; letter-spacing: -.02em; }
.sec h2 span { color: var(--text-3); }
.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px; }
.step { padding: 24px; border-radius: var(--r-lg); display: grid; gap: 8px; align-content: start; }
.step__n { color: var(--brand); }
.step h3 { font-size: 20px; font-weight: 600; line-height: 1.3; }
.step p { font-size: 15px; color: var(--text-2); line-height: 1.55; }
.step__art { width: 100%; height: 64px; margin-top: 8px; background: var(--bg-subtle); border-radius: var(--r); }
.uses { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 32px; }
.use { display: grid; grid-template-columns: 44px 1fr; column-gap: 16px; row-gap: 2px; padding: 20px; border-radius: var(--r-lg); box-shadow: 0 0 0 1px var(--line); color: var(--text); transition: box-shadow .15s, transform .15s; }
.use:hover { box-shadow: 0 0 0 1px var(--brand); transform: translateY(-1px); }
.use__ic { grid-row: span 2; width: 44px; height: 44px; border-radius: var(--r); background: var(--c); display: grid; place-items: center; color: #1F2A44; }
.use__ic svg { width: 22px; height: 22px; }
.use b { font-weight: 600; font-size: 17px; }
.use > span:last-child { font-size: 14px; color: var(--text-2); line-height: 1.5; }
.note { margin-top: 16px; font-size: 14px; color: var(--text-3); }
.alt { display: flex; align-items: center; gap: 24px; padding: 32px; background: var(--panel); box-shadow: none; color: var(--text); border-radius: var(--r-xl); }
.alt h3 { font-size: 24px; line-height: 1.25; font-weight: 600; letter-spacing: -.01em; }
.alt p:not(.label) { margin-top: 8px; color: var(--text-2); }
.alt__go { margin-left: auto; width: 48px; height: 48px; border-radius: 999px; background: var(--brand); color: #fff; display: grid; place-items: center; font-size: 22px; flex: none; }
.faq { margin-top: 24px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; padding: 20px 40px 20px 0; font-size: 18px; font-weight: 600; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 8px; top: 50%; width: 10px; height: 10px; border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3); transform: translateY(-70%) rotate(45deg); transition: transform .15s; }
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq details p { padding: 0 0 20px; color: var(--text-2); max-width: 640px; }

/* side panels */
.toc { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; counter-reset: t; }
.toc a { display: flex; gap: 12px; padding: 8px 12px; border-radius: var(--r-sm); color: var(--text-2); font-size: 15px; }
.toc a::before { counter-increment: t; content: "0" counter(t); font: 12px/1.9 var(--mono); color: var(--text-3); }
.toc a:hover { background: var(--bg-subtle); color: var(--text); }
.track { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 16px; font-size: 15px; color: var(--text-2); }
.track li { display: flex; gap: 12px; align-items: flex-start; }
.track b { display: block; font-weight: 600; color: var(--text); word-break: break-all; }
.track li > span { width: 18px; height: 18px; border-radius: 999px; flex: none; margin-top: 3px; box-shadow: inset 0 0 0 1.5px var(--line-strong); }
.track .is-done > span { background: var(--ok); box-shadow: none; }
.track .is-now > span { box-shadow: inset 0 0 0 2px var(--brand); background: radial-gradient(circle, var(--brand) 0 3px, transparent 4px); }
.track .is-now { color: var(--text); font-weight: 500; }
.specs { margin: 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.specs div { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.specs dt { color: var(--text-3); }
.specs dd { margin: 0; font-weight: 500; }
.sidecard { padding: 20px; border-radius: var(--r-lg); }
.sidecard .small { margin-top: 12px; }
.specs--price dd { color: var(--text); }
.tips { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; font-size: 14px; color: var(--text-2); line-height: 1.5; }
.tips b { color: var(--text); font-weight: 600; }
.drop--side { border: 2px dashed var(--drop-line); background: var(--drop-bg); box-shadow: none; text-align: center; padding: 24px 16px; }
.drop--side .small { margin: 0; }
.drop--side u { color: var(--brand); }

/* text sections + plain pages (about, privacy, terms, contact, guides below the tool) */
.prose { margin-top: 24px; max-width: 680px; }
.prose > * + * { margin-top: 16px; }
.prose h2, .prose h3 { font-size: 22px; line-height: 1.3; font-weight: 600; margin-top: 32px; }
.prose p, .prose li { color: var(--text-2); font-size: 17px; line-height: 1.65; }
.prose ul, .prose ol { padding-left: 22px; margin-bottom: 0; }
.prose li + li { margin-top: 8px; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose b, .prose strong { color: var(--text); font-weight: 600; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 12px 8px; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--text-2); overflow-wrap: anywhere; }
.prose th { color: var(--text); font-weight: 600; }
.prose code { font: 14px var(--mono); }
.page { padding: 64px 0 0; }
.page h1 { font-size: 48px; line-height: 1.1; font-weight: 650; letter-spacing: -.03em; }
.page .updated { margin-top: 16px; }
.crumbs { display: flex; gap: 8px; font-size: 14px; color: var(--text-3); margin-bottom: 16px; }
.crumbs a { color: var(--text-2); }
.next { margin-top: 48px; }

.skip { position: absolute; left: -9999px; top: 8px; z-index: 30; padding: 8px 16px; border-radius: var(--r); background: var(--brand); color: #fff; }
.skip:focus { left: 16px; }
.updated-foot { margin-top: 64px; }
.use--plain { grid-template-columns: 1fr; }
.use--static:hover { box-shadow: 0 0 0 1px var(--line); transform: none; }
.warmth__label { display: grid; gap: 2px; }
.warmth__label span { font-size: 14px; color: var(--text-2); }

/* footer */
.foot-site { margin-top: 128px; background: var(--bg-subtle); border-top: 1px solid var(--line); }
.foot-site__in { max-width: 1168px; margin: 0 auto; padding: 56px 24px 32px; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.foot-site__in > div { display: grid; gap: 8px; align-content: start; }
.foot-site__in a:not(.logo) { color: var(--text-2); font-size: 15px; }
.foot-site__in .label { margin-bottom: 4px; font-size: 12px; }
.foot-site__base { max-width: 1168px; margin: 0 auto; padding: 16px 24px 32px; border-top: 1px solid var(--line); }

/* tablet */
@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav .btn { margin-left: auto; }
  .foot-site__in { grid-template-columns: 1fr 1fr; }
}
/* phone */
@media (max-width: 640px) {
  .nav__in { height: 56px; padding: 0 16px; gap: 12px; }
  .logo { font-size: 15px; gap: 6px; }
  .logo svg { width: 24px; height: 24px; }
  .nav .btn--sm { padding: 0 12px; font-size: 14px; }
  .shell { padding: 0 16px; }
  .hero { padding-top: 28px; }
  .hero h1 { font-size: 34px; letter-spacing: -.025em; }
  .hero__sub { font-size: 17px; margin-top: 8px; }
  .page { padding-top: 32px; }
  .page h1 { font-size: 34px; }
  .prose p, .prose li { font-size: 16px; }
  .lead { font-size: 17px; margin-top: 12px; }
  .hero .lead { display: none; }
  .tool { margin-top: 20px; padding: 8px; }
  .drop { padding: 28px 16px 24px; }
  .drop__title { font-size: 20px; }
  .drop__sub { display: none; }
  .btn--lg { width: 100%; }
  .drop .btn--lg { margin-top: 8px; }
  .trust { flex-direction: column; align-items: flex-start; gap: 10px; margin: 20px 8px 0; }
  .stage { padding-top: 28px; }
  .stage__title { font-size: 28px; }
  .stage__title--big { font-size: 36px; }
  .player { padding: 8px; border-radius: var(--r-lg); }
  .video { border-radius: var(--r); }
  .player__bar { padding: 16px 4px 4px; gap: 8px; flex-wrap: wrap; }
  .pill { width: 56px; height: 44px; }
  .seg button { padding: 0 16px; }
  .time { width: 100%; order: 3; margin: 0; padding-left: 4px; }
  .wave { padding: 8px 4px 0; }
  .wave canvas { height: 64px; }
  .warmth, .dl { margin-left: 4px; margin-right: 4px; }
  .proc__pct { font-size: 48px; }
  .proc { padding: 16px; }
  .notice__actions .btn { width: auto; }
  .sec { padding-top: 64px; }
  .sec h2 { font-size: 30px; }
  .cards3, .uses { grid-template-columns: 1fr; }
  .alt { padding: 24px; }
  .alt__go { display: none; }
  .foot-site { margin-top: 72px; }
  .quickdl { display: none; }
  body[data-state=result] { padding-bottom: 76px; }
  body[data-state=result] .mobilebar { display: block; position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); background: rgba(255,255,255,.92); backdrop-filter: blur(12px); border-top: 1px solid var(--line); }
}