/* ═══════════════════════════════════════════════════════════
   Hush — styles

   Quiet and open: cool paper, one indigo accent, hairlines instead
   of boxes, no gradients or shadows. Manrope for
   words, IBM Plex Mono for every number. Tokens on :root (light),
   redefined for dark. Logical properties so RTL pages mirror.
   ═══════════════════════════════════════════════════════════ */
:root{
  --bg:#F5F6F8; --card:#FFFFFF; --ink:#0F1117; --muted:#5C6370; --faint:#99A0AB; --line:#E2E5EA; --soft:#ECEEF2;
  --accent:#4F46E5; --accent-ink:#FFFFFF; --accent-soft:#E8E7FC; --ok:#16855A; --warn:#B26A00;
  --b0:#C9D6CF; --b1:#9CC7B0; --b2:#5FB389; --b3:#E5B342; --b4:#EC8333; --b5:#E5484D;
  --r:18px;
  --f:"Manrope",system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Devanagari","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0A0B0F; --card:#121419; --ink:#ECEEF3; --muted:#959BA7; --faint:#5E6470; --line:#23262E; --soft:#1A1D24;
  --accent:#8B87FF; --accent-ink:#0A0B0F; --accent-soft:#24234A; --ok:#3DD68C; --warn:#F2B04E;
  --b0:#26302B; --b1:#2D4B3B; --b2:#3A8A62; --b3:#C59A35; --b4:#D2702C; --b5:#F0585D;
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--f);-webkit-font-smoothing:antialiased}
:root[lang="ar"]{--f:"Noto Sans Arabic","Geeza Pro","SF Arabic","Segoe UI",Tahoma,system-ui,sans-serif}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px}
h1,h2,h3{line-height:1.15;margin:0 0 .6em;letter-spacing:-.025em;font-weight:750}
h1{font-size:clamp(2rem,1.5rem + 2vw,2.8rem);letter-spacing:-.04em}
h2{font-size:1.3rem}
h3{font-size:1rem;font-weight:700;letter-spacing:-.01em;margin-bottom:.3em}
p{margin:0 0 1em}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}
/* Rings only for keyboard users, never after a tap or click. */
:focus:not(:focus-visible){outline:none}
button,a,summary{-webkit-tap-highlight-color:transparent}
::selection{background:var(--accent);color:var(--accent-ink)}
.skip{position:absolute;inset-inline-start:-999px;top:8px;background:var(--card);padding:8px 12px;border-radius:10px;z-index:9}
.skip:focus{inset-inline-start:8px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.i{width:1.1em;height:1.1em;flex:none;vertical-align:-.18em;stroke-width:1.75}

/* ── header ────────────────────────────────────────────── */
.top{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:20px;max-width:1080px;margin:0 auto;padding:12px 20px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.brand{display:inline-flex;align-items:center;gap:9px;font-weight:800;font-size:1.05rem;text-decoration:none;letter-spacing:-.03em}
.logo{width:24px;height:24px;color:var(--ink);flex:none}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.nav a{text-decoration:none;color:var(--muted);font-size:.9rem;font-weight:600;white-space:nowrap;padding:6px 12px;border-radius:999px;transition:color .15s,background .15s}
.nav a:hover{color:var(--ink)}
.nav a[aria-current]{color:var(--accent);background:var(--accent-soft)}
.top-tools{margin-inline-start:auto;display:flex;align-items:center;gap:4px}
.lang{position:relative}
.lang summary{list-style:none;display:flex;align-items:center;gap:5px;cursor:pointer;height:36px;padding:0 10px;border-radius:10px;font-size:.82rem;font-weight:700;color:var(--muted)}
.lang summary::-webkit-details-marker{display:none}
.lang summary:hover{color:var(--ink);background:var(--soft)}
.lang .chev{width:13px;height:13px;transition:transform .2s}
.lang[open] .chev{transform:rotate(180deg)}
.lang ul{position:absolute;inset-inline-end:0;top:calc(100% + 8px);z-index:40;list-style:none;margin:0;padding:6px;background:var(--card);border:1px solid var(--line);border-radius:14px;columns:2;column-gap:2px;width:max-content;min-width:260px}
.lang li{break-inside:avoid}
.lang a{display:block;padding:7px 12px;border-radius:9px;text-decoration:none;font-size:.93rem}
.lang a:hover{background:var(--soft)}
.lang a[aria-current]{color:var(--accent);font-weight:700}
.icon-btn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:10px;border:0;background:none;color:var(--muted);cursor:pointer;transition:color .15s,background .15s}
.icon-btn:hover{color:var(--ink);background:var(--soft)}
.icon-btn .i{width:18px;height:18px}

/* ── buttons ───────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:8px 16px;border-radius:12px;border:0;background:var(--soft);color:var(--ink);font:inherit;font-weight:700;font-size:.9rem;cursor:pointer;text-decoration:none;transition:background .15s,color .15s}
.btn:hover{background:var(--line)}
.btn .i{color:var(--muted)}
.btn.primary{background:var(--accent);color:var(--accent-ink)}
.btn.primary .i{color:inherit}
.btn.primary:hover{background:color-mix(in srgb,var(--accent) 86%,var(--ink))}
.btn.big{min-height:56px;padding-inline:30px;font-size:1.02rem;border-radius:16px}
.btn.small{min-height:34px;padding:4px 12px;font-size:.84rem;gap:6px;border-radius:10px}

/* ── hero ──────────────────────────────────────────────── */
main{max-width:1080px;margin:0 auto;padding:0 20px}
.hero{max-width:600px;margin:0 auto;padding:40px 0 4px;text-align:center}
.lede{color:var(--muted);font-size:1.06rem;margin:0}

/* ── meter ─────────────────────────────────────────────── */
.tool{max-width:620px;margin:0 auto 80px;padding-top:24px;display:flex;flex-direction:column;align-items:stretch;gap:12px}
.tool-bar{display:flex;align-items:center;gap:12px;min-height:28px;padding:0 4px}
.tool-bar:has(.badge[hidden]){display:none}
.badge{display:inline-flex;align-items:center;gap:7px;font-size:.74rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--faint)}
.tool[data-state="live"] .badge::before{background:var(--accent);animation:pulse 1.6s infinite}
@keyframes pulse{50%{opacity:.25}}

/* Segmented controls: a tinted track with a raised white thumb. */
.seg{display:inline-flex;margin-inline-start:auto;background:var(--soft);border-radius:11px;padding:3px;flex:none}
.seg button{border:0;background:none;color:var(--muted);font:inherit;font-size:.82rem;font-weight:700;padding:5px 12px;border-radius:8px;cursor:pointer;transition:color .15s,background .15s}
.seg button[aria-pressed="true"]{background:var(--card);color:var(--ink)}

/* The meter panel: the gauge on a soft card, wide and roomy. */
.dial-card{padding:8px 0 4px}
.gauge-wrap{position:relative;width:100%;max-width:540px;margin:0 auto}
.gauge{display:block;width:100%;height:auto}
.track{fill:none;stroke:var(--soft);stroke-width:16;stroke-linecap:round}
.fill{fill:none;stroke:var(--accent);stroke-width:16;stroke-linecap:round;transition:stroke .3s}
.tool[data-band="3"] .fill{stroke:var(--b3)}
.tool[data-band="4"] .fill{stroke:var(--b4)}
.tool[data-band="5"] .fill,.tool.alerting .fill{stroke:var(--b5)}
.maxmark{fill:none;stroke:var(--ink);stroke-width:24}
.rim{fill:none;stroke-width:3;stroke-linecap:round}
.r0{stroke:var(--b0)} .r1{stroke:var(--b1)} .r2{stroke:var(--b2)} .r3{stroke:var(--b3)} .r4{stroke:var(--b4)} .r5{stroke:var(--b5)}
.tk{stroke:var(--faint);stroke-width:1;opacity:.7}
.tk.mj{stroke:var(--muted);opacity:1}
.num{fill:var(--faint);font:500 12px var(--mono);text-anchor:middle;dominant-baseline:central}
/* The readout box spans most of the arc's width and sits low in it,
   so the number never crowds the scale labels. */
.readout{position:absolute;inset-inline:12%;top:32%;bottom:4%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;line-height:1;direction:ltr}
.lvl{font:400 clamp(3.4rem,2.4rem + 5vw,5.4rem)/1 var(--mono);letter-spacing:-.06em;transition:color .3s}
.unit{display:inline-block;margin-top:6px;font:600 .9rem var(--mono);color:var(--accent);letter-spacing:.02em}
.tool[data-state="idle"] .lvl,.tool[data-state="starting"] .lvl{color:var(--line)}
.band{margin:10px 0 0;font-size:.95rem;font-weight:700;color:var(--muted);transition:color .3s}
.tool[data-band="2"] .band{color:var(--ok)} .tool[data-band="3"] .band{color:var(--b3)} .tool[data-band="4"] .band{color:var(--b4)} .tool[data-band="5"] .band{color:var(--b5)}
[dir="rtl"] .band{direction:rtl}
.tool.alerting .lvl{color:var(--b5)}
.like{margin:6px 0 0;text-align:center;color:var(--faint);font-size:.88rem;min-height:1.4em}
.tool.clipping .like{color:var(--warn)}
.tool.estimated .unit::after{content:"*";color:var(--faint);margin-inline-start:1px}
.stats dd,.kv dd,.chart-note,.stepper output{unicode-bidi:plaintext}
#start{align-self:center;margin:6px 0}
.tool:not([data-state="idle"]) #start{display:none}
.status{margin:0;text-align:center;font-size:.92rem;color:var(--muted)}
.status.warn{color:var(--warn)}

/* Four numbers as soft tiles. */
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:0;border-block:1px solid var(--line)}
.stats div{padding:14px 6px;text-align:center}
.stats div+div{border-inline-start:1px solid var(--line)}
.stats dt{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--faint)}
.stats dd{margin:4px 0 0;font:500 1.3rem var(--mono);letter-spacing:-.04em}

.chart{padding:14px 0 4px}
.chart-bar{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.chart-bar .seg{margin-inline-start:0}
.chart-note{margin-inline-start:auto;font:500 .8rem var(--mono);color:var(--muted);text-align:end}
#chart{display:block;width:100%;height:180px}

/* Actions: six tinted tiles, one row (two on phones). */
.palette{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;width:100%}
.tbtn{display:grid;justify-items:center;align-content:center;gap:6px;min-width:0;min-height:78px;text-align:center;line-height:1.25;padding:10px 4px;border:0;border-radius:16px;background:none;color:var(--muted);font:inherit;font-size:.74rem;font-weight:700;cursor:pointer;transition:color .15s,background .15s}
.tbtn .lbl{overflow-wrap:break-word;hyphens:auto;max-width:100%}
.tbtn .i{width:20px;height:20px;color:var(--ink)}
.tbtn:hover{color:var(--ink);background:var(--soft)}

/* Panels: soft cards with a small label. */
.panels{display:grid;grid-template-columns:1fr;gap:12px;margin-top:4px}
.panel{padding:20px 0 6px;border-top:1px solid var(--line)}
.panel h2{display:flex;align-items:center;gap:7px;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em;color:var(--faint);margin-bottom:12px}
.panel h2 .i{width:14px;height:14px;color:var(--accent)}
.kv{margin:0;display:grid;gap:8px}
.kv div{display:flex;justify-content:space-between;gap:12px;align-items:baseline}
.kv dt{color:var(--muted);font-size:.9rem}
.kv dd{margin:0;font:500 .92rem var(--mono);text-align:end}
.kv dd.big{font-size:1.15rem;font-weight:600}
.dosebar{height:6px;border-radius:3px;background:var(--soft);margin:14px 0 10px;overflow:hidden}
.dosebar span{display:block;height:100%;width:0;background:var(--accent);border-radius:3px;transition:width .4s}
.dosebar.over span{background:var(--b5)}
.note,.muted{font-size:.84rem;color:var(--faint);margin:0}
.muted{color:var(--muted);margin-bottom:14px}
.set{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:8px 0;font-size:.9rem;color:var(--muted)}
.set+.set{border-top:1px solid var(--soft)}
.set small{display:block;font-size:.78rem;color:var(--faint)}
.set .seg{margin:0}
.chk{cursor:pointer}
.chk input[type="checkbox"]{width:18px;height:18px;accent-color:var(--accent);margin:0;cursor:pointer}
.alert-in{display:inline-flex;align-items:center;gap:8px;color:var(--ink)}
.alert-in input[type="number"],.field input{font:500 .93rem var(--mono);color:var(--ink);background:var(--soft);border:0;border-radius:10px;min-height:36px;padding:4px 10px;width:76px}
.stepper{direction:ltr;display:inline-flex;align-items:center;gap:2px;background:var(--soft);border-radius:11px;padding:3px}
.stepper .icon-btn{width:32px;height:32px;font-size:1.1rem;color:var(--ink);border-radius:8px}
.stepper .icon-btn:hover{background:var(--card)}
.stepper output{min-width:64px;text-align:center;color:var(--ink);font:500 .92rem var(--mono)}
.row-btns{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 8px}
.field{display:grid;gap:6px;margin:0 0 16px;font-size:.88rem;color:var(--muted)}
.field input{width:100%;min-height:48px;font-size:1.15rem}

/* ── dialog ────────────────────────────────────────────── */
.dlg{width:min(440px,calc(100% - 32px));border:0;border-radius:22px;padding:22px 24px;background:var(--card);color:var(--ink)}
.dlg::backdrop{background:rgba(8,9,14,.45)}
.dlg:focus{outline:none}
.dlg-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px}
.dlg-head h2{margin:0;font-size:1.15rem}

/* ── full screen ───────────────────────────────────────── */
body.immersive{overflow:hidden}
body.immersive .tool{position:fixed;inset:0;z-index:100;margin:0;max-width:none;background:var(--bg);overflow-y:auto;overscroll-behavior:contain;
  padding:max(16px,env(safe-area-inset-top)) max(16px,calc(50vw - 320px)) max(16px,env(safe-area-inset-bottom));justify-content:center}
body.immersive .gauge-wrap{max-width:min(100%,70vh,640px)}
body.immersive .panels{display:none}

/* ── content ───────────────────────────────────────────── */
.content{max-width:760px;margin:0 auto}
.block{margin:0 0 72px}
.block>h2{margin-bottom:14px;font-size:clamp(1.4rem,1.15rem + 1vw,1.8rem);letter-spacing:-.035em}
.eyebrow{margin:0 0 10px;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.14em;color:var(--accent)}
.intro{color:var(--muted);font-size:1.04rem;margin-bottom:20px}
.block p{color:color-mix(in srgb,var(--ink) 82%,var(--bg))}
.block a{color:var(--accent);text-decoration-color:color-mix(in srgb,var(--accent) 40%,transparent)}
.table-wrap{overflow-x:auto;margin:6px 0 18px}
.table-wrap table{width:100%;border-collapse:collapse;font-size:.93rem}
.table-wrap th,.table-wrap td{text-align:start;padding:11px 14px 11px 0;border-bottom:1px solid var(--line)}
.table-wrap tr:last-child td{border-bottom:0}
.table-wrap th{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--faint)}
.table-wrap td{color:var(--muted)}
.table-wrap .db{white-space:nowrap;color:var(--ink);font:600 .9rem var(--mono)}
.bd{display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.bd::before{content:"";width:8px;height:8px;border-radius:50%;flex:none}
.bd.b0::before{background:var(--b0)} .bd.b1::before{background:var(--b1)} .bd.b2::before{background:var(--b2)}
.bd.b3::before{background:var(--b3)} .bd.b4::before{background:var(--b4)} .bd.b5::before{background:var(--b5)}
/* Illustrations: drawn on white, framed by the page tint. */
.fig{margin:20px 0 24px}
.fig img{display:block;width:100%;height:auto;border-radius:var(--r)}
:root[data-theme="dark"] .fig img{filter:brightness(.9)}
.closing{max-width:760px;margin:-16px auto 72px;display:flex;gap:10px;align-items:flex-start;color:var(--faint);font-size:.9rem}
.closing .i{margin-top:3px;color:var(--accent)}
.steps{margin:0;padding:0;list-style:none;counter-reset:s;display:grid}
.steps li{counter-increment:s;position:relative;padding:16px 0;padding-inline-start:46px;border-top:1px solid var(--line)}
.steps li::before{content:counter(s);position:absolute;inset-inline-start:0;top:15px;width:28px;height:28px;display:grid;place-items:center;border-radius:9px;background:var(--accent-soft);color:var(--accent);font:600 .85rem var(--mono)}
.cards{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:4px 28px}
.cards li{padding:18px 0 8px;border-top:1px solid var(--line)}
.card-ic{display:block;margin-bottom:10px}
.card-ic .i{width:22px;height:22px;color:var(--accent)}
.cards h3{margin:0 0 4px}
.cards p{margin:0;color:var(--muted);font-size:.92rem}
.faq{margin-bottom:72px}
.faq details{border-top:1px solid var(--line)}
.faq details:last-of-type{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:16px 0;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq .chev{color:var(--faint);transition:transform .2s}
.faq details[open] .chev{transform:rotate(180deg)}
.answer p{color:var(--muted);margin-top:-4px}
.tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:8px}
.tiles a{display:grid;padding:14px 0;border-top:1px solid var(--line);text-decoration:none}
.tiles a:hover strong{color:var(--accent)}
.tiles strong{font-weight:700}
.tiles span{color:var(--muted);font-size:.88rem}

/* ── articles ──────────────────────────────────────────── */
.article{max-width:680px;padding-top:36px;padding-bottom:24px}
.meta{color:var(--faint);font-size:.85rem;margin-top:14px}
.prose{margin-top:28px}
.prose h2{margin-top:2em}
.prose a{color:var(--accent)}
.prose ul,.prose ol{padding-inline-start:1.3em}
.prose li{margin-bottom:.4em}
.lost{text-align:center;padding-top:56px}
.lost-code{font:400 4.5rem var(--mono);letter-spacing:-.06em;color:var(--accent);margin:0}
.lost .tiles{text-align:start;margin-top:40px}

/* ── footer ────────────────────────────────────────────── */
.foot{max-width:1080px;margin:0 auto;padding:36px 20px 48px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px;color:var(--muted);font-size:.88rem}
.foot-brand p{margin:8px 0 0;color:var(--faint)}
.foot .brand{color:var(--ink)}
.foot-links{list-style:none;margin:0;padding:0;display:grid;gap:6px;align-content:start}
.foot-links a{text-decoration:none}
.foot-links a:hover{color:var(--accent)}
.fine{grid-column:1/-1;margin:0;font-size:.8rem;color:var(--faint)}

/* ── small screens ─────────────────────────────────────── */
@media (max-width:720px){
  .foot{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1/-1}
}
@media (max-width:560px){
  main{padding:0 14px}
  .top{flex-wrap:wrap;gap:6px 16px;padding:10px 14px}
  .nav{order:3;width:100%;margin-inline:-12px;width:calc(100% + 24px)}
  .hero{padding-top:18px}
  .lede{font-size:1rem}
  .tool{padding-top:16px;gap:10px}
  .dial-card{padding:4px 0}
  .stats{gap:6px}
  .stats dd{font-size:1.12rem}
  .palette{gap:6px;grid-template-columns:repeat(3,minmax(0,1fr))}
  .tbtn{min-height:72px;font-size:.7rem}
  .lang ul{columns:1;min-width:190px;max-height:70vh;overflow:auto}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}