/* Visual polish layered over each guide's original styles, in the paymybills
   landing-page theme (warm paper, dot grid, receipt + stamp motifs).
   Load order: page <style> → polish.css → responsive.css (device tweaks win). */
@import url("https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400;12..96,500;12..96,600;12..96,700;12..96,800&display=swap");

/* ---------- theme tokens: same palette as the landing page ---------- */
:root{
  --bg:#E3DAC5; --paper:#F4ECD8; --paper2:#ECE2CB; --ink:#1C1B18; --muted:#655D4E; --line:#D2C5AA;
  --stamp:#C7372F; --green:#1F7A45; --hl:#F3E3AE; --hl-ink:#5B4500;
  --sans:"Bricolage Grotesque", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --r-sm:10px; --r-md:14px; --r-lg:18px;
  --shadow-sm:0 1px 2px rgba(40,32,16,.05),0 3px 10px -4px rgba(40,32,16,.10);
  --shadow-md:0 2px 4px rgba(40,32,16,.05),0 18px 40px -18px rgba(40,32,16,.30);
  --ease:cubic-bezier(.2,.7,.2,1);
  --cur:var(--ink);
  --read:color-mix(in srgb,var(--ink) 86%,var(--muted));
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#15140F; --paper:#201E18; --paper2:#2A271F; --ink:#F1ECE0; --muted:#A39D8F; --line:#38342B;
    --stamp:#FF6A5E; --green:#5ED08C; --hl:#3A3312; --hl-ink:#FFE38A;
    --shadow-sm:0 1px 0 rgba(255,255,255,.03) inset,0 3px 12px -6px rgba(0,0,0,.6);
    --shadow-md:0 1px 0 rgba(255,255,255,.04) inset,0 22px 44px -20px rgba(0,0,0,.8);
  }
}
:root[data-theme="dark"]{
  --bg:#15140F; --paper:#201E18; --paper2:#2A271F; --ink:#F1ECE0; --muted:#A39D8F; --line:#38342B;
  --stamp:#FF6A5E; --green:#5ED08C; --hl:#3A3312; --hl-ink:#FFE38A;
  --shadow-sm:0 1px 0 rgba(255,255,255,.03) inset,0 3px 12px -6px rgba(0,0,0,.6);
  --shadow-md:0 1px 0 rgba(255,255,255,.04) inset,0 22px 44px -20px rgba(0,0,0,.8);
}

::selection{background:color-mix(in srgb,var(--hl-ink) 22%,var(--hl))}
html{scrollbar-width:thin;scrollbar-color:var(--line) transparent}
body{font-size:17px;line-height:1.65;text-rendering:optimizeLegibility;
  background-color:var(--bg);
  background-image:radial-gradient(color-mix(in srgb,var(--ink) 7%,transparent) 1px,transparent 1px);background-size:18px 18px}

/* receipt label: small mono caps */
.rl{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

/* ---------- logo (same wordmark as the landing page) ---------- */
.logo{display:inline-block;font-family:var(--sans);font-weight:800;letter-spacing:-.055em;line-height:.9;text-decoration:none;color:var(--ink);
  font-size:clamp(2rem,3.2vw,2.6rem);margin-bottom:26px;transition:transform .25s var(--ease)}
.logo span{color:var(--stamp)}
.logo:hover{transform:translateY(-2px) rotate(-1.5deg)}
.logo-mini{flex:none;font-size:1.45rem;margin:0 6px 0 0}
.logo-mini:hover{transform:rotate(-2deg)}

/* ---------- hero ---------- */
.hero{padding-top:56px;padding-bottom:40px}
.hero h1{text-wrap:balance;letter-spacing:-.05em;font-weight:800;line-height:.95;margin-bottom:20px}
.hero p{text-wrap:pretty;font-size:1.1rem;line-height:1.6}
.homelink{display:inline-flex;align-items:center;gap:6px;padding:6px 14px 6px 11px;margin-bottom:24px;border-radius:999px;
  background:var(--paper);border:1px solid var(--line);font-family:var(--mono);font-size:.78rem;letter-spacing:.04em;box-shadow:var(--shadow-sm);transition:transform .2s var(--ease),color .2s}
.homelink:hover{transform:translateX(-3px)}
.hero .stats{gap:0;margin-top:8px}
.hero .stats>div{padding:0 24px;border-left:2px dashed var(--line);font-family:var(--mono);font-size:.74rem;text-transform:uppercase;letter-spacing:.08em}
.hero .stats>div:first-child{padding-left:0;border-left:0}
.hero .stats b{font-family:var(--sans);font-size:2.1rem;font-weight:800;letter-spacing:-.04em;text-transform:none;font-variant-numeric:tabular-nums;line-height:1.15}

.stack{gap:6px}
.layer{border-radius:var(--r-sm);border-left-width:4px;box-shadow:var(--shadow-sm);background:var(--paper);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.layer:hover{transform:translateX(5px) rotate(-.3deg);box-shadow:var(--shadow-md);background:var(--paper)}
.layer .n{font-weight:700}
.stack-cap{font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;margin-top:12px}

/* resume pill (polish.js) */
.resume{display:inline-flex;align-items:center;gap:12px;margin-top:28px;padding:10px 18px 10px 12px;border-radius:12px;
  background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow-sm);text-decoration:none;font-size:.95rem;max-width:100%;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.resume:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.resume i{font-style:normal;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;flex:none;background:var(--ink);color:var(--bg);font-size:.8rem}
.resume small{display:block;font-family:var(--mono);color:var(--muted);font-size:.68rem;text-transform:uppercase;letter-spacing:.1em}
.resume span{min-width:0}
.resume b{display:block;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---------- toolbar ---------- */
.bar{background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.readbar{position:absolute;left:0;bottom:-1px;height:3px;width:100%;transform-origin:0 50%;transform:scaleX(var(--rp,0));
  background:var(--cur);transition:background .4s;pointer-events:none}
.search{border-radius:12px;background:var(--paper);box-shadow:var(--shadow-sm);transition:border-color .2s,box-shadow .2s}
.search:focus-within{border-color:var(--ink);box-shadow:0 0 0 4px color-mix(in srgb,var(--ink) 8%,transparent)}
.search kbd{font-family:var(--mono);font-size:.72rem;color:var(--muted);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 7px;flex:none}
.search:focus-within kbd{display:none}
.chip,.seg,.iconbtn{transition:background .2s,border-color .2s,color .2s,transform .15s}
.chip{font-weight:600}
.chip:hover,.iconbtn:hover{border-color:var(--ink)}
.chip:active,.iconbtn:active{transform:scale(.97)}
.seg{border-radius:999px;padding:3px;gap:2px}
.seg button{border-radius:999px;padding:5px 13px;font-weight:600}
.chip.rf{box-shadow:0 8px 20px -10px color-mix(in srgb,var(--ink) 70%,transparent)}
.iconbtn{border-radius:12px}

/* ---------- sidebar ---------- */
nav.side{padding-right:4px;scrollbar-width:none}
.side h3{font-family:var(--mono);text-transform:uppercase;letter-spacing:.1em;font-size:.7rem}
.side .links{position:relative;display:flex;flex-direction:column;gap:2px}
.side a{position:relative;color:var(--muted);transition:background .2s,color .2s}
.side a:hover{color:var(--ink);background:color-mix(in srgb,var(--ink) 5%,transparent)}
.side a.active{color:var(--ink);background:var(--paper);box-shadow:var(--shadow-sm);font-weight:600}
.side a.active::before{content:"";position:absolute;left:-1px;top:8px;bottom:8px;width:3px;border-radius:3px;background:var(--sc)}
.side a .c{font-variant-numeric:tabular-nums}
.side a .c.full{color:var(--green);font-weight:700}

/* "Bill paid" box as a mini receipt */
.prog{border-radius:0;border:0;box-shadow:var(--shadow-sm);padding:18px 18px 26px;background:var(--paper);font-family:var(--mono);font-size:.8rem;--z:8px;
  -webkit-mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) bottom/calc(var(--z)*2) var(--z) repeat-x,linear-gradient(#000 0 0) top/100% calc(100% - var(--z)) no-repeat;
  mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) bottom/calc(var(--z)*2) var(--z) repeat-x,linear-gradient(#000 0 0) top/100% calc(100% - var(--z)) no-repeat}
.prog strong{display:block;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;padding-bottom:10px;border-bottom:2px dashed var(--line)}
.prog .track{height:8px;border:0;border-radius:99px;background:color-mix(in srgb,var(--ink) 9%,transparent);margin:14px 0 8px}
.prog .fill{border-radius:99px;background:var(--green);transition:width .6s var(--ease)}
.prog small{font-size:.74rem;line-height:1.5}
.pstat{font-family:var(--sans);font-size:.95rem}
.prog small{display:block;margin-bottom:2px}
.pstat{margin:4px 0 14px}
.prog button#reset{display:flex;align-items:center;justify-content:center;gap:7px;width:100%;margin:0;padding:8px 10px;
  border:1px dashed var(--line);border-radius:10px;background:transparent;color:var(--muted);text-decoration:none;cursor:pointer;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;transition:color .2s,border-color .2s,background .2s}
.prog button#reset::before{content:"↺";font-size:.95rem;letter-spacing:0;line-height:1}
.prog button#reset:hover{color:var(--ink);border-style:solid;border-color:var(--ink)}
.prog button#reset.armed{color:var(--paper);background:var(--ink);border-style:solid;border-color:var(--ink)}
.prog button#reset.armed::before{content:"!"}

/* ---------- night-before list as a receipt ---------- */
.cram{position:relative;border:0;border-radius:0;padding:28px 30px 38px;margin-bottom:56px;background:var(--paper);box-shadow:var(--shadow-md);--z:10px;
  -webkit-mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) bottom/calc(var(--z)*2) var(--z) repeat-x,linear-gradient(#000 0 0) top/100% calc(100% - var(--z)) no-repeat;
  mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) bottom/calc(var(--z)*2) var(--z) repeat-x,linear-gradient(#000 0 0) top/100% calc(100% - var(--z)) no-repeat}
.cram h2{font-family:var(--mono);font-size:1.05rem;letter-spacing:.16em;text-transform:uppercase;text-align:center;margin:0}
.cram p{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;text-align:center;margin:6px 0 0;padding-bottom:16px;border-bottom:2px dashed var(--line)}
.cram .grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:0 28px;margin-top:10px;counter-reset:cram}
.cram a{counter-increment:cram;position:relative;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:baseline;
  background:none;border:0;border-bottom:1px dashed var(--line);border-radius:0;padding:11px 6px;font-weight:600;font-size:.95rem;line-height:1.4;transition:background .15s}
.cram a::before{content:counter(cram,decimal-leading-zero);font-family:var(--mono);font-size:.72rem;font-weight:700;color:var(--sc)}
.cram a::after{content:"→";color:var(--muted);transition:transform .2s var(--ease),color .2s}
.cram a:hover{background:color-mix(in srgb,var(--sc) 7%,transparent)}
.cram a:hover::after{transform:translateX(3px);color:var(--sc)}

/* ---------- sections ---------- */
section.sec{margin-bottom:72px;scroll-margin-top:90px}
.sec-head{display:grid;grid-template-columns:auto 1fr;column-gap:16px;align-items:center;border-bottom:0;padding-bottom:16px;margin-bottom:22px;position:relative}
.sec-head::after{content:"";position:absolute;left:0;right:0;bottom:0;border-bottom:2px dashed var(--line)}
.sec-head::before{content:"";position:absolute;left:0;bottom:-1px;width:88px;height:4px;border-radius:4px;background:var(--sc);z-index:1}
.sec-head .idx{grid-row:span 2;font-family:var(--mono);font-size:.95rem;font-weight:700;color:var(--bg);background:var(--sc);
  width:46px;height:46px;border-radius:12px;display:grid;place-items:center;transform:rotate(-4deg);box-shadow:var(--shadow-sm)}
.sec-head h2{font-size:clamp(1.6rem,2.4vw,2.1rem);font-weight:800;letter-spacing:-.04em;line-height:1.1;text-wrap:balance}
.sec-head p{grid-column:2;font-size:.95rem}
.sec-head p .rl{margin-left:6px}

/* ---------- question cards: numbered rail + receipt tear line ---------- */
.card{position:relative;padding-left:74px;border-radius:var(--r-md);margin-bottom:16px;background:var(--paper);border:1px solid var(--line);
  box-shadow:var(--shadow-sm);scroll-margin-top:96px;overflow:visible;transition:box-shadow .25s var(--ease),border-color .25s,transform .25s var(--ease)}
.card::before{content:"";position:absolute;left:64px;top:16px;bottom:16px;border-left:2px dashed var(--line)}
.card::after{content:"";position:absolute;left:-1px;top:18px;width:4px;height:30px;border-radius:0 4px 4px 0;background:var(--sc)}
.card:hover{box-shadow:var(--shadow-md);border-color:color-mix(in srgb,var(--ink) 18%,var(--line))}
.card.done{opacity:1}
.card summary{padding:20px 22px 18px 16px;border-radius:0 var(--r-md) var(--r-md) 0}
.card summary h4{font-size:1.2rem;font-weight:700;letter-spacing:-.02em;line-height:1.35;text-wrap:balance}
.qn{position:absolute;left:0;top:19px;width:64px;text-align:center;font-family:var(--mono);font-weight:700;font-size:1.2rem;line-height:1;color:var(--ink);letter-spacing:-.02em}
.qn::before{content:"Q";display:block;font-size:.6rem;letter-spacing:.14em;color:var(--muted);margin-bottom:4px;font-weight:600}
.card summary .meta{margin-top:10px}
.card summary .meta:empty{display:none}
.card.done summary h4{color:var(--muted)}
.card.done .qn{color:var(--green)}

.tag{border-radius:6px;padding:1px 8px;font-size:.66rem;font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;font-weight:700}
.tag.must{display:inline-block;background:var(--hl);color:var(--hl-ink);border:1px solid color-mix(in srgb,var(--hl-ink) 22%,transparent)}
.tag.must::before{content:"★ "}
.chev{border-radius:50%;width:32px;height:32px;border:1px solid var(--line);transition:transform .3s var(--ease),background .2s,color .2s}
.card summary:hover .chev{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.card.is-current{border-color:var(--ink);box-shadow:0 0 0 3px color-mix(in srgb,var(--ink) 10%,transparent),var(--shadow-md)}

/* PAID stamp once revised */
.card-foot{position:relative;padding:4px 22px 18px 16px;justify-content:flex-start}
.card.done .card-foot::after{content:"✓\APAID";white-space:pre;position:absolute;right:24px;bottom:12px;width:52px;height:52px;border-radius:50%;
  display:grid;place-items:center;text-align:center;border:2px solid var(--green);outline:1px solid var(--green);outline-offset:-6px;color:var(--green);
  font-family:var(--mono);font-weight:700;font-size:.56rem;line-height:1.15;letter-spacing:.12em;transform:rotate(-14deg);opacity:.85;animation:stamp .35s var(--ease)}
@keyframes stamp{from{transform:rotate(-14deg) scale(1.8);opacity:0}}

/* smooth open / close where the browser supports it */
@supports (interpolate-size:allow-keywords){
  :root{interpolate-size:allow-keywords}
  .card::details-content{block-size:0;overflow-y:clip;transition:block-size .32s var(--ease),content-visibility .32s allow-discrete}
  .card[open]::details-content{block-size:auto}
}

/* ---------- answer typography ---------- */
.ans{padding:4px 30px 14px 16px;border-top:0;color:var(--read);font-size:1.03rem;line-height:1.75;position:relative}
.ans::before{content:"";position:absolute;left:16px;right:22px;top:0;border-top:2px dashed var(--line)}
.ans>*:first-child{margin-top:16px}
.ans p,.ans ul,.ans ol{max-width:74ch;text-wrap:pretty}
.ans b,.ans strong{color:var(--ink);font-weight:700}
.ans li{margin:.4em 0;padding-left:.2em}
.ans code{background:var(--paper2);border-color:var(--line);color:var(--ink);border-radius:6px;font-size:.83em}
.tw{border-radius:12px;border-color:var(--line);margin:16px 0;max-width:min(100%,960px);background:var(--paper)}
table{font-size:.94rem;line-height:1.5}
th{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);background:var(--paper2);font-weight:700}
td,th{padding:11px 14px;border-bottom:1px dashed var(--line)}
tr:hover td{background:color-mix(in srgb,var(--sc) 6%,transparent)}
td:first-child{color:var(--ink)}
.flow{gap:8px;margin:16px 0}
.flow span{border-radius:8px;background:var(--paper2);border-color:var(--line);color:var(--ink);box-shadow:0 1px 0 var(--line)}
.flow i{color:var(--sc);font-weight:700}
.tip{position:relative;padding:12px 16px 12px 44px;border-radius:var(--r-sm);background:color-mix(in srgb,var(--hl) 60%,var(--paper));
  border:1px dashed color-mix(in srgb,var(--hl-ink) 30%,var(--line));color:var(--read);max-width:74ch;line-height:1.6}
.tip::before{content:"💡";position:absolute;left:15px;top:11px;font-size:.95rem}

/* code, images and sub-headings (used heavily by the resume-prep guides) */
.ans pre{background:#1C1B18;color:#F1ECE0;border-radius:12px;padding:14px 16px;overflow-x:auto;font-size:.84rem;line-height:1.55;max-width:min(100%,900px);
  margin:14px 0;box-shadow:var(--shadow-sm)}
.ans pre code{background:none;border:0;padding:0;color:inherit;font-size:inherit}
.ans h5{font-size:.78rem;font-family:var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:20px 0 6px}
.ans img{display:block;max-width:min(100%,720px);height:auto;margin:16px 0 6px;border-radius:12px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-sm)}
.imgcap{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--muted);margin-bottom:12px}
.ans em{color:var(--ink)}

/* syntax colours: warm palette on the dark code panel */
.hljs{display:block;background:transparent;color:#F1ECE0}
.hljs-comment,.hljs-quote{color:#8F877B;font-style:italic}
.hljs-keyword,.hljs-selector-tag,.hljs-literal,.hljs-doctag,.hljs-meta,.hljs-meta .hljs-keyword{color:#FF9E64}
.hljs-string,.hljs-regexp,.hljs-addition,.hljs-meta .hljs-string{color:#A8D883}
.hljs-number,.hljs-symbol{color:#D3A8F5}
.hljs-title,.hljs-title.function_,.hljs-section{color:#FFD479}
.hljs-title.class_,.hljs-type,.hljs-built_in{color:#FFC27A}
.hljs-attr,.hljs-attribute,.hljs-property,.hljs-variable.language_,.hljs-selector-class,.hljs-selector-id{color:#7FC4E8}
.hljs-name,.hljs-tag{color:#8FD694}
.hljs-variable,.hljs-template-variable,.hljs-params,.hljs-subst{color:#F1ECE0}
.hljs-bullet,.hljs-link{color:#F7C948}
.hljs-deletion{color:#FF7B72}
.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}
/* dark theme: sink the code panel below the card so it still stands out */
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .ans pre{background:#0F0E0A;border:1px solid var(--line)}}
:root[data-theme="dark"] .ans pre{background:#0F0E0A;border:1px solid var(--line)}

/* revised toggle */
.mark{padding:6px 14px 6px 10px;border-radius:999px;border:1px solid var(--line);font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;transition:all .2s var(--ease)}
.mark:hover{border-color:var(--green);color:var(--ink)}
.mark input{accent-color:var(--green)}
.mark:has(input:checked){background:color-mix(in srgb,var(--green) 12%,transparent);border-color:color-mix(in srgb,var(--green) 45%,transparent);color:var(--green)}

.empty{border-radius:var(--r-lg);padding:56px 24px;background:var(--paper)}

/* ---------- bottom: next guide + nav ---------- */
.next-guide{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:8px 0 40px;padding:24px 28px;border-radius:var(--r-lg);
  background:var(--ink);color:var(--bg);box-shadow:var(--shadow-md);text-decoration:none;transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.next-guide:hover{transform:translateY(-3px) rotate(-.4deg)}
.next-guide small{display:block;font-family:var(--mono);opacity:.7;font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;margin-bottom:4px}
.next-guide b{font-size:1.5rem;font-weight:800;letter-spacing:-.03em}
.next-guide .arr{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:var(--bg);color:var(--ink);font-size:1.2rem;flex:none;transition:transform .25s var(--ease)}
.next-guide:hover .arr{transform:translateX(4px)}
.guides{padding-top:8px;padding-bottom:20px}
.guides a{font-weight:600;transition:border-color .2s}
.guides a:hover{border-color:var(--ink)}
footer{display:flex;flex-wrap:wrap;gap:6px 20px;justify-content:space-between;border-top:2px dashed var(--line);padding-top:18px;margin-top:8px;font-family:var(--mono);font-size:.74rem}
.keys{display:flex;flex-wrap:wrap;gap:4px 14px}
.keys kbd{font-family:var(--mono);font-size:.72rem;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:0 6px;margin-right:4px;background:var(--paper)}

/* back to top */
.totop{position:fixed;right:max(18px,env(safe-area-inset-right));bottom:calc(env(safe-area-inset-bottom,0px) + 18px);z-index:30;width:46px;height:46px;border-radius:50%;
  border:0;background:var(--ink);color:var(--bg);box-shadow:var(--shadow-md);cursor:pointer;display:grid;place-items:center;opacity:0;transform:translateY(10px) scale(.9);pointer-events:none;
  transition:opacity .25s,transform .25s var(--ease)}
.totop.show{opacity:1;transform:none;pointer-events:auto}

/* ---------- rapid fire ---------- */
.rfo{background:color-mix(in srgb,var(--bg) 60%,#000 40%)}
.rf-card{border-radius:22px;padding:26px 28px;background:var(--paper);box-shadow:0 40px 80px -30px rgba(0,0,0,.55);animation:pop .35s var(--ease)}
.rf-q{text-wrap:balance;font-weight:800;letter-spacing:-.03em}
.rf-btns button{border-radius:12px;transition:transform .15s,filter .2s}
.rf-btns .ok{background:var(--green)}
.rf-btns button:hover{filter:brightness(1.06)}
.rf-btns button:active{transform:scale(.98)}
@keyframes pop{from{opacity:0;transform:translateY(12px) scale(.98)}}

/* gentle entrance while scrolling (scroll-driven, no JS) */
@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .card,.sec-head{animation:rise linear both;animation-timeline:view();animation-range:entry 0% entry 22%}
  }
}
@keyframes rise{from{opacity:.25;transform:translateY(14px)}}

/* ---------- small screens ---------- */
@media (max-width:900px){
  .side .links{flex-direction:row}
  .side a.active::before{left:10px;right:10px;top:auto;bottom:-1px;width:auto;height:2px}
  .search kbd{display:none}

  .prog{max-width:420px}
}
@media (max-width:520px){
  body{font-size:16.5px}
  .hero .stats>div{padding:0 16px}
  .hero .stats b{font-size:1.7rem}
  .card{padding-left:0}
  .card::before{display:none}
  .card::after{top:16px;height:22px}
  .qn{position:static;display:block;width:auto;text-align:left;font-size:.72rem;margin-bottom:6px;color:var(--sc)}
  .qn::before{display:inline;font-size:inherit;letter-spacing:0;color:inherit;margin:0}
  .card summary h4{text-wrap:pretty}
  .ans{font-size:1rem}
  .ans::before{left:14px;right:14px}
  .card-foot{padding:0 14px 14px}
  .card.done .card-foot::after{right:14px;bottom:10px;width:46px;height:46px}
  .cram{padding:22px 16px 32px}
  .cram .grid{grid-template-columns:1fr}
    .sec-head .idx{width:38px;height:38px;border-radius:10px;font-size:.85rem}
  .next-guide{padding:18px 20px}
  .next-guide b{font-size:1.2rem}
  .keys{display:none}
  .logo{font-size:2rem;margin-bottom:18px}
}
@media (max-width:1180px){.logo-mini{display:none}}