/* PhysicsDNA homepage (front-page.php). Everything is scoped under .pd-home.
   Uses core design tokens; base rules the homepage needs are repeated here under
   .pd-home so the page still looks right if a base rule changes elsewhere. */

/* ---------- base (scoped duplicates) ---------- */
.pd-home{display:block;overflow-x:clip}
.pd-home *,.pd-home *::before,.pd-home *::after{box-sizing:border-box}
.pd-home a{color:inherit;text-decoration:none}
.pd-home button{font:inherit;color:inherit;cursor:pointer}
.pd-home :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.pd-home .wrap{max-width:var(--wrap,1200px);margin-inline:auto;padding-inline:var(--gut,clamp(16px,4vw,40px))}
.pd-home h1,.pd-home h2,.pd-home h3{color:var(--ink);font-family:var(--f-display);font-weight:400;letter-spacing:-.015em;text-wrap:balance;margin:0;line-height:1.08}
.pd-home h2{font-size:clamp(2rem,3.6vw,3rem)}
.pd-home h3{font-size:1.45rem;line-height:1.2}
.pd-home p{margin:0}
.pd-home em.hl{font-style:italic;color:var(--accent)}
.pd-home .eyebrow{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:inline-flex;align-items:center;gap:10px}
.pd-home .eyebrow::before{content:"";width:18px;height:1px;background:currentColor;flex:none}
.pd-home .lede{color:var(--muted);font-size:1.075rem;max-width:58ch}
.pd-home .mono{font-family:var(--f-mono)}
.pd-home .btn{display:inline-flex;align-items:center;gap:10px;padding:13px 22px;border-radius:999px;font-weight:600;font-size:.95rem;line-height:1.3;border:1px solid transparent;transition:transform .2s,background .2s,border-color .2s,box-shadow .2s,color .2s;white-space:nowrap;text-decoration:none}
.pd-home .btn svg{transition:transform .2s;flex:none}
.pd-home .btn:hover svg{transform:translateX(3px)}
.pd-home .btn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:0 6px 18px -8px var(--accent)}
.pd-home .btn-primary:hover{transform:translateY(-1px);color:var(--accent-ink)}
.pd-home .btn-ghost{border-color:var(--line);background:var(--surface);color:var(--ink-2)}
.pd-home .btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.pd-home .chip{font-family:var(--f-mono);font-size:.7rem;padding:4px 10px;border-radius:999px;background:var(--sunk);color:var(--ink-2);border:1px solid var(--line);line-height:1.5}
.pd-home .link-arrow{color:var(--accent);font-weight:600;display:inline-flex;gap:8px;align-items:center}
.pd-home .link-arrow svg{transition:transform .2s}
.pd-home .link-arrow:hover svg,.pd-home a:hover .link-arrow svg{transform:translateX(3px)}
.pd-home .figure{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden;min-width:0;margin:0}
.pd-home .fig-top,.pd-home .fig-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 18px;font-family:var(--f-mono);font-size:.74rem;color:var(--muted);flex-wrap:wrap;margin:0;line-height:1.5}
.pd-home .fig-top{border-bottom:1px solid var(--line)}
.pd-home .fig-foot{border-top:1px solid var(--line)}
.pd-home .fig-top b{color:var(--ink);font-weight:500}
.pd-home .dots{display:flex;gap:6px}
.pd-home .dots i{width:8px;height:8px;border-radius:50%;background:var(--line)}
.pd-home .canvas-wrap{position:relative;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px}
.pd-home .nosign{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;color:var(--good);font-weight:600}
.pd-home .screen-reader-text{border:0;clip:rect(1px,1px,1px,1px);clip-path:inset(50%);height:1px;width:1px;margin:-1px;overflow:hidden;padding:0;position:absolute!important;word-wrap:normal!important}
.pd-home [hidden]{display:none!important}

.pd-home .pd-h-sec{padding-block:clamp(64px,9vw,112px)}
.pd-home .pd-h-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:20px 40px;margin-bottom:44px}
.pd-home .pd-h-head > div:not(.pd-h-tabs){display:grid;gap:14px;min-width:0}
.pd-home .pd-h-head-lede{max-width:42ch}
.pd-home .pd-h-muted{color:var(--muted)}
.pd-home .pd-h-small{font-size:.8rem}

/* ---------- hero ---------- */
.pd-home .pd-h-hero{padding-block:clamp(48px,7vw,88px) clamp(48px,6vw,72px);position:relative}
.pd-home .pd-h-hero .wrap{position:relative;display:grid;grid-template-columns:1.02fr 1fr;gap:clamp(32px,5vw,72px);align-items:center}
.pd-home .pd-h-hero-copy{display:grid;gap:26px;min-width:0}
.pd-home .pd-h-hero h1{font-size:clamp(2.7rem,5.6vw,4.7rem);line-height:1.02}
.pd-home .pd-h-ctas{display:flex;flex-wrap:wrap;gap:12px}
.pd-home .pd-h-proof{display:flex;flex-wrap:wrap;gap:18px 32px;padding-top:8px;border-top:1px solid var(--line)}
.pd-home .pd-h-proof div{display:grid;gap:2px;padding-top:14px}
.pd-home .pd-h-proof b{font-family:var(--f-display);font-size:1.9rem;font-weight:500;line-height:1;font-variant-numeric:tabular-nums;color:var(--ink)}
.pd-home .pd-h-proof span{font-size:.82rem;color:var(--muted)}
.pd-home .pd-h-helix{display:block;width:100%;height:clamp(260px,32vw,400px);cursor:crosshair}
.pd-home .pd-h-eq{position:absolute;font-family:var(--f-mono);font-size:.78rem;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:6px 10px;box-shadow:var(--shadow);white-space:nowrap;line-height:1.4}
.pd-home .pd-h-eq-a{top:16px;left:16px;color:var(--accent)}
.pd-home .pd-h-eq-b{bottom:16px;right:16px;color:var(--signal)}
.pd-home .pd-h-hint{color:var(--muted)}
.pd-home .pd-h-live{font-variant-numeric:tabular-nums;color:var(--ink)}
@media (max-width:900px){.pd-home .pd-h-hero .wrap{grid-template-columns:minmax(0,1fr)}}

/* ---------- syllabus strip ---------- */
.pd-home .pd-h-strip{border-block:1px solid var(--line);background:var(--tint)}
.pd-home .pd-h-strip .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px 28px;padding-block:20px;font-size:.9rem;color:var(--ink-2);font-weight:500}
.pd-home .pd-h-strip span{display:inline-flex;align-items:center;gap:8px}
.pd-home .pd-h-strip svg{color:var(--good);flex:none}

/* ---------- chapter picker ---------- */
.pd-home .pd-h-tabs{display:flex;gap:6px;padding:5px;background:var(--sunk);border:1px solid var(--line);border-radius:999px;width:max-content;max-width:100%;overflow-x:auto;scrollbar-width:none}
.pd-home .pd-h-tabs::-webkit-scrollbar{display:none}
.pd-home .pd-h-tab{border:0;background:transparent;padding:9px 18px;border-radius:999px;font-weight:600;font-size:.92rem;color:var(--muted);white-space:nowrap;transition:background .2s,color .2s;line-height:1.4}
.pd-home .pd-h-tab:hover{color:var(--ink)}
.pd-home .pd-h-tab[aria-selected="true"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.pd-home .pd-h-path-grid{display:grid;grid-template-columns:320px minmax(0,1fr);gap:28px;margin-top:28px;align-items:start}
.pd-home .pd-h-aside{background:var(--tint);border:1px solid var(--line);border-radius:var(--r,14px);padding:28px;display:grid;gap:18px;position:sticky;top:96px;min-width:0}
.pd-home .pd-h-aside h3{font-size:1.7rem}
.pd-home .pd-h-aside p{color:var(--muted);font-size:.95rem}
.pd-home .pd-h-aside .btn{justify-self:start}
.pd-home .pd-h-legend{display:grid;gap:8px;font-size:.85rem;color:var(--ink-2)}
.pd-home .pd-h-legend span{display:flex;gap:10px;align-items:center}
.pd-home .pd-h-res{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:6px;font-family:var(--f-mono);font-size:.68rem;font-weight:500;font-style:normal;flex:none;line-height:1}
.pd-home .pd-h-res-n{background:var(--accent-soft);color:var(--accent)}
.pd-home .pd-h-res-m{background:var(--signal-soft);color:var(--signal)}
.pd-home .pd-h-res-q{background:var(--good-soft);color:var(--good)}
.pd-home .pd-h-res-v{background:var(--sunk);color:var(--ink-2);border:1px solid var(--line)}
.pd-home .pd-h-panels{min-width:0}
.pd-home .pd-h-chapters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;border-top:1px solid var(--line)}
.pd-home .pd-h-empty{grid-column:1/-1;padding:24px 8px;color:var(--muted)}
.pd-home .pd-h-chap{display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:14px;align-items:center;padding:16px 8px;border-bottom:1px solid var(--line);transition:background .15s;color:var(--ink-2)}
.pd-home .pd-h-chap:nth-child(odd){border-right:1px solid var(--line);padding-right:20px}
.pd-home .pd-h-chap:nth-child(even){padding-left:20px}
.pd-home .pd-h-chap:hover{background:var(--tint)}
.pd-home .pd-h-chap:hover .pd-h-chap-name{color:var(--accent)}
.pd-home .pd-h-chap-no{font-family:var(--f-mono);font-size:.8rem;color:var(--muted);font-variant-numeric:tabular-nums}
.pd-home .pd-h-chap-name{font-weight:500;transition:color .15s;min-width:0;color:var(--ink);line-height:1.45;overflow-wrap:anywhere}
.pd-home .pd-h-chap-name small{display:block;font-weight:400;color:var(--muted);font-size:.78rem}
.pd-home .pd-h-chap-res{display:flex;gap:4px}
.pd-home .pd-h-hy{font-family:var(--f-mono);font-size:.62rem;letter-spacing:.06em;text-transform:uppercase;color:var(--signal);margin-left:6px;white-space:nowrap}
@media (max-width:960px){.pd-home .pd-h-path-grid{grid-template-columns:minmax(0,1fr)}.pd-home .pd-h-aside{position:static}}
@media (max-width:640px){.pd-home .pd-h-chapters{grid-template-columns:minmax(0,1fr)}.pd-home .pd-h-chap:nth-child(odd){border-right:0;padding-right:8px}.pd-home .pd-h-chap:nth-child(even){padding-left:8px}.pd-home .pd-h-chap{grid-template-columns:32px minmax(0,1fr) auto;gap:10px}}

/* ---------- library bento ---------- */
.pd-home .pd-h-library{padding-top:0}
.pd-home .pd-h-bento{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:18px}
.pd-home .pd-h-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r,14px);overflow:hidden;display:flex;flex-direction:column;transition:transform .25s,border-color .25s,box-shadow .25s;min-width:0;color:var(--ink-2)}
.pd-home .pd-h-card:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--accent) 45%,var(--line));box-shadow:var(--shadow)}
.pd-home .pd-h-art{background-color:var(--sunk);background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:20px 20px;border-bottom:1px solid var(--line);display:grid;place-items:center;padding:18px;height:190px}
.pd-home .pd-h-art svg{width:100%;height:100%;max-width:340px}
.pd-home .pd-h-body{padding:24px 26px 26px;display:grid;gap:10px;flex:1;align-content:start}
.pd-home .pd-h-body p{color:var(--muted);font-size:.95rem}
.pd-home .pd-h-meta{display:flex;justify-content:space-between;align-items:center;margin-top:8px;padding-top:14px;border-top:1px dashed var(--line);font-size:.85rem;gap:12px;flex-wrap:wrap}
.pd-home .pd-h-meta .mono{color:var(--muted);font-size:.75rem}
.pd-home .pd-h-c-notes,.pd-home .pd-h-c-maps{grid-column:span 3}
.pd-home .pd-h-c-q,.pd-home .pd-h-c-papers,.pd-home .pd-h-c-tests{grid-column:span 2}
.pd-home .pd-h-c-books{grid-column:span 6;flex-direction:row}
.pd-home .pd-h-c-books .pd-h-art{border-bottom:0;border-left:1px solid var(--line);order:2;flex:1.1;height:auto;min-height:220px}
.pd-home .pd-h-c-books .pd-h-body{flex:1;align-content:center}
@media (max-width:960px){.pd-home .pd-h-bento{grid-template-columns:repeat(2,minmax(0,1fr))}.pd-home .pd-h-c-notes,.pd-home .pd-h-c-maps,.pd-home .pd-h-c-q,.pd-home .pd-h-c-papers{grid-column:span 1}.pd-home .pd-h-c-tests,.pd-home .pd-h-c-books{grid-column:span 2}}
@media (max-width:640px){.pd-home .pd-h-bento{grid-template-columns:minmax(0,1fr)}.pd-home .pd-h-c-notes,.pd-home .pd-h-c-maps,.pd-home .pd-h-c-q,.pd-home .pd-h-c-papers,.pd-home .pd-h-c-tests,.pd-home .pd-h-c-books{grid-column:span 1}.pd-home .pd-h-c-books{flex-direction:column}.pd-home .pd-h-c-books .pd-h-art{order:0;border-left:0;border-bottom:1px solid var(--line);min-height:190px;flex:none}.pd-home .pd-h-body{padding:20px}}

/* ---------- projectile lab ---------- */
.pd-home .pd-h-lab{background:var(--tint);border-block:1px solid var(--line)}
.pd-home .pd-h-lab-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(28px,5vw,64px);align-items:center}
.pd-home .pd-h-lab-copy{display:grid;gap:22px;min-width:0}
.pd-home .pd-h-ctrl{display:grid;gap:8px}
.pd-home .pd-h-ctrl label{display:flex;justify-content:space-between;gap:12px;font-size:.9rem;font-weight:500;color:var(--ink)}
.pd-home .pd-h-ctrl output{font-family:var(--f-mono);color:var(--accent);font-variant-numeric:tabular-nums}
.pd-home input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:99px;background:linear-gradient(90deg,var(--accent) var(--p,50%),var(--line) var(--p,50%));outline-offset:6px;margin:6px 0;border:0;padding:0}
.pd-home input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--surface);border:2px solid var(--accent);box-shadow:var(--shadow)}
.pd-home input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--surface);border:2px solid var(--accent)}
.pd-home .pd-h-readouts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border:1px solid var(--line);border-radius:12px;overflow:hidden}
.pd-home .pd-h-readouts div{padding:14px 16px;display:grid;gap:2px;background:var(--surface);min-width:0}
.pd-home .pd-h-readouts div+div{border-left:1px solid var(--line)}
.pd-home .pd-h-readouts span{font-size:.75rem;color:var(--muted)}
.pd-home .pd-h-readouts b{font-family:var(--f-mono);font-weight:500;font-size:1.05rem;font-variant-numeric:tabular-nums;color:var(--ink)}
.pd-home .pd-h-readouts small{font-family:var(--f-mono);font-size:.7rem;color:var(--muted)}
.pd-home .pd-h-lab-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.pd-home .pd-h-lab-f{font-size:.8rem;color:var(--muted)}
.pd-home .pd-h-lab-note{font-size:.88rem;color:var(--muted);background:var(--signal-soft);border-radius:10px;padding:12px 14px}
.pd-home .pd-h-lab-note b{color:var(--ink)}
.pd-home .pd-h-proj{display:block;width:100%;aspect-ratio:16/10;max-width:100%}
@media (max-width:900px){.pd-home .pd-h-lab-grid{grid-template-columns:minmax(0,1fr)}}
@media (max-width:420px){.pd-home .pd-h-readouts div{padding:12px 10px}}

/* ---------- method loop ---------- */
.pd-home .pd-h-loop{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;position:relative;list-style:none;margin:0;padding:0}
.pd-home .pd-h-loop::before{content:"";position:absolute;top:27px;left:10%;right:10%;height:1px;background:repeating-linear-gradient(90deg,var(--accent) 0 6px,transparent 6px 12px);opacity:.5}
.pd-home .pd-h-step{display:grid;gap:12px;justify-items:center;text-align:center;padding-inline:12px;position:relative;margin:0}
.pd-home .pd-h-ring{width:56px;height:56px;border-radius:50%;background:var(--surface);border:1px solid var(--line);display:grid;place-items:center;color:var(--accent);box-shadow:var(--shadow);transition:transform .25s,border-color .25s}
.pd-home .pd-h-step:hover .pd-h-ring{transform:scale(1.08);border-color:var(--accent)}
.pd-home .pd-h-step b{font-size:1.05rem;color:var(--ink)}
.pd-home .pd-h-step p{font-size:.88rem;color:var(--muted);max-width:22ch}
.pd-home .pd-h-k{font-family:var(--f-mono);font-size:.7rem;color:var(--muted);letter-spacing:.1em}
@media (max-width:820px){.pd-home .pd-h-loop{grid-template-columns:minmax(0,1fr);gap:22px}.pd-home .pd-h-loop::before{top:0;bottom:0;left:27px;right:auto;width:1px;height:auto;background:repeating-linear-gradient(180deg,var(--accent) 0 6px,transparent 6px 12px)}.pd-home .pd-h-step{grid-template-columns:56px minmax(0,1fr);justify-items:start;text-align:left;column-gap:18px;row-gap:2px;padding:0}.pd-home .pd-h-ring{grid-row:span 3}.pd-home .pd-h-step p{max-width:none}}

/* ---------- test series band ---------- */
.pd-home .pd-h-band{background:var(--band);color:var(--band-ink);position:relative;overflow:hidden}
.pd-home .pd-h-band::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:32px 32px;pointer-events:none}
.pd-home .pd-h-band .wrap{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(32px,5vw,64px);align-items:start}
.pd-home .pd-h-band .wrap > div{min-width:0}
.pd-home .pd-h-band h2,.pd-home .pd-h-band h3{color:var(--band-ink)}
.pd-home .pd-h-band h2{margin-top:16px}
.pd-home .pd-h-band .eyebrow{color:var(--signal)}
.pd-home .pd-h-band h2 em{color:var(--signal);font-style:italic}
.pd-home .pd-h-band .lede{color:var(--band-muted);margin-top:18px}
.pd-home .pd-h-feat{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 28px;margin-top:34px}
.pd-home .pd-h-feat div{display:grid;gap:6px;padding-top:16px;border-top:1px solid var(--band-line);align-content:start}
.pd-home .pd-h-feat b{font-weight:600}
.pd-home .pd-h-feat span{color:var(--band-muted);font-size:.9rem}
.pd-home .pd-h-sched{background:var(--band-2);border:1px solid var(--band-line);border-radius:18px;padding:26px;display:grid;gap:18px}
.pd-home .pd-h-sched-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap}
.pd-home .pd-h-sched-head h3{font-size:1.4rem}
.pd-home .pd-h-sched-head span{font-family:var(--f-mono);font-size:.72rem;color:var(--band-muted);letter-spacing:.08em;text-transform:uppercase}
.pd-home .pd-h-test{display:grid;grid-template-columns:58px minmax(0,1fr) auto;gap:16px;align-items:center;padding:12px 0;border-top:1px solid var(--band-line)}
.pd-home .pd-h-date{text-align:center;border:1px solid var(--band-line);border-radius:10px;padding:6px 0;line-height:1.1}
.pd-home .pd-h-date b{display:block;font-family:var(--f-display);font-size:1.5rem;font-weight:500}
.pd-home .pd-h-date small{font-family:var(--f-mono);font-size:.65rem;color:var(--band-muted);text-transform:uppercase}
.pd-home .pd-h-test p{font-weight:500;min-width:0;line-height:1.45}
.pd-home .pd-h-test p small{display:block;color:var(--band-muted);font-weight:400;font-size:.8rem}
.pd-home .pd-h-pill{font-family:var(--f-mono);font-size:.68rem;padding:4px 9px;border-radius:999px;border:1px solid var(--band-line);color:var(--band-muted);white-space:nowrap}
.pd-home .pd-h-pill.pd-h-free{color:var(--signal);border-color:color-mix(in srgb,var(--signal) 50%,transparent)}
.pd-home .pd-h-price{display:flex;align-items:end;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:18px;border-top:1px solid var(--band-line)}
.pd-home .pd-h-price b{font-family:var(--f-display);font-size:2.4rem;font-weight:500;line-height:1}
.pd-home .pd-h-price s{color:var(--band-muted);font-size:.95rem;margin-left:8px}
.pd-home .pd-h-price small{display:block;color:var(--band-muted);font-size:.8rem;margin-top:4px}
.pd-home .pd-h-btn-signal{background:var(--signal);color:#1A1205}
.pd-home .pd-h-btn-signal:hover{transform:translateY(-1px);color:#1A1205}
@media (max-width:900px){.pd-home .pd-h-band .wrap{grid-template-columns:minmax(0,1fr)}}
@media (max-width:520px){.pd-home .pd-h-feat{grid-template-columns:minmax(0,1fr)}.pd-home .pd-h-sched{padding:20px}.pd-home .pd-h-test{grid-template-columns:52px minmax(0,1fr) auto;gap:12px}}

/* ---------- question of the day ---------- */
.pd-home .pd-h-qotd{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:stretch}
.pd-home .pd-h-qcard{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:clamp(22px,3.5vw,36px);display:grid;gap:22px;min-width:0;align-content:start}
.pd-home .pd-h-qmeta{display:flex;gap:8px;flex-wrap:wrap}
.pd-home .pd-h-qtext{font-family:var(--f-display);font-size:clamp(1.3rem,2.2vw,1.6rem);line-height:1.35;color:var(--ink)}
.pd-home .pd-h-opts{display:grid;gap:10px}
.pd-home .pd-h-opt{display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:14px;align-items:center;text-align:left;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);transition:border-color .15s,background .15s,transform .15s;width:100%;line-height:1.45}
.pd-home .pd-h-opt:hover:not([disabled]){border-color:var(--accent);transform:translateX(3px)}
.pd-home .pd-h-l{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-family:var(--f-mono);font-size:.8rem;background:var(--surface);border:1px solid var(--line)}
.pd-home .pd-h-opt[disabled]{cursor:default;opacity:1}
.pd-home .pd-h-opt.pd-h-right{border-color:var(--good);background:var(--good-soft)}
.pd-home .pd-h-opt.pd-h-right .pd-h-l{background:var(--good);color:var(--surface);border-color:var(--good)}
.pd-home .pd-h-opt.pd-h-wrong{border-color:var(--bad);background:var(--bad-soft)}
.pd-home .pd-h-opt.pd-h-wrong .pd-h-l{background:var(--bad);color:var(--surface);border-color:var(--bad)}
.pd-home .pd-h-stat{font-family:var(--f-mono);font-size:.72rem;color:var(--muted);white-space:nowrap}
.pd-home .pd-h-explain{background:var(--tint);border:1px solid var(--line);border-radius:18px;padding:clamp(22px,3.5vw,36px);min-width:0}
.pd-home .pd-h-locked,.pd-home .pd-h-answer{display:grid;gap:16px;align-content:start}
.pd-home .pd-h-explain h3{font-size:1.5rem}
.pd-home .pd-h-explain p{color:var(--ink-2);font-size:.97rem}
.pd-home .pd-h-explain p.pd-h-muted{color:var(--muted)}
.pd-home .pd-h-formula{font-family:var(--f-mono);font-size:.88rem;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--ink);overflow-x:auto}
.pd-home .pd-h-mistake{border-left:3px solid var(--signal);padding-left:14px}
.pd-home .pd-h-mistake b{color:var(--ink)}
@media (max-width:900px){.pd-home .pd-h-qotd{grid-template-columns:minmax(0,1fr)}}
@media (max-width:420px){.pd-home .pd-h-opt{grid-template-columns:30px minmax(0,1fr);gap:12px;padding:12px}.pd-home .pd-h-stat{grid-column:2}.pd-home .pd-h-stat:empty{display:none}}

/* ---------- book reviews ---------- */
.pd-home .pd-h-books-sec{padding-top:0}
.pd-home .pd-h-books{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.pd-home .pd-h-book{display:grid;grid-template-columns:96px minmax(0,1fr);gap:20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r,14px);padding:22px;transition:border-color .2s,transform .2s;min-width:0;align-items:start;color:var(--ink-2)}
.pd-home .pd-h-book:hover{border-color:var(--accent);transform:translateY(-3px)}
.pd-home .pd-h-cover{aspect-ratio:3/4.2;border-radius:4px 8px 8px 4px;padding:12px 10px;display:flex;flex-direction:column;justify-content:space-between;color:#fff;font-family:var(--f-display);font-size:.9rem;line-height:1.15;box-shadow:inset 6px 0 0 rgba(0,0,0,.18),0 10px 20px -10px rgba(13,27,51,.5);max-width:100%;overflow:hidden;overflow-wrap:break-word;hyphens:auto}
.pd-home .pd-h-cover small{font-family:var(--f-mono);font-size:.55rem;opacity:.8;letter-spacing:.08em;text-transform:uppercase}
.pd-home .pd-h-cover-img{padding:0;background:var(--sunk);position:relative}
.pd-home .pd-h-cover-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.pd-home .pd-h-book-body{display:grid;gap:8px;align-content:start;min-width:0}
.pd-home .pd-h-book-body h3{font-size:1.2rem}
.pd-home .pd-h-book-body p{font-size:.88rem;color:var(--muted)}
.pd-home .pd-h-verdict-chips{display:flex;flex-wrap:wrap;gap:6px}
.pd-home .pd-h-verdict-chips .chip{font-size:.65rem}
.pd-home .pd-h-score{font-family:var(--f-mono);font-size:.8rem;color:var(--ink-2)}
.pd-home .pd-h-score i{display:inline-block;width:20px;height:5px;border-radius:9px;background:var(--line);margin-right:3px;vertical-align:middle}
.pd-home .pd-h-score i.pd-h-on{background:var(--signal)}
@media (max-width:960px){.pd-home .pd-h-books{grid-template-columns:minmax(0,1fr)}}
@media (max-width:420px){.pd-home .pd-h-book{grid-template-columns:76px minmax(0,1fr);gap:14px;padding:16px}.pd-home .pd-h-cover{font-size:.72rem;padding:9px 7px}.pd-home .pd-h-cover small{font-size:.5rem}.pd-home .pd-h-score i{width:16px}}

/* ---------- teacher ---------- */
.pd-home .pd-h-teacher-sec{background:var(--tint);border-block:1px solid var(--line)}
.pd-home .pd-h-teacher{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(28px,6vw,80px);align-items:center}
.pd-home .pd-h-portrait{position:relative;aspect-ratio:4/5;max-width:420px;width:100%;border-radius:20px;background:var(--sunk);border:1px solid var(--line);overflow:hidden;display:grid;place-items:center}
.pd-home .pd-h-portrait canvas{position:absolute;inset:0;width:100%;height:100%}
.pd-home .pd-h-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.pd-home .pd-h-badge{position:relative;font-family:var(--f-display);font-size:clamp(3rem,9vw,5rem);color:var(--accent);font-style:italic;text-align:center;line-height:1.1;padding:0 16px}
.pd-home .pd-h-cap{position:absolute;left:14px;right:14px;bottom:14px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;display:flex;justify-content:space-between;gap:10px;font-size:.85rem;align-items:center;flex-wrap:wrap}
.pd-home .pd-h-cap b{color:var(--ink)}
.pd-home .pd-h-cap span{color:var(--muted);font-family:var(--f-mono);font-size:.72rem}
.pd-home .pd-h-teacher-copy{display:grid;gap:26px;min-width:0}
.pd-home .pd-h-quote{font-family:var(--f-display);font-size:clamp(1.6rem,3vw,2.4rem);line-height:1.2;letter-spacing:-.01em;text-wrap:balance;color:var(--ink)}
.pd-home .pd-h-quote em{color:var(--accent)}
.pd-home .pd-h-beliefs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:8px}
.pd-home .pd-h-beliefs div{display:grid;gap:6px;padding-top:14px;border-top:2px solid var(--ink);align-content:start}
.pd-home .pd-h-beliefs b{font-size:.98rem;color:var(--ink)}
.pd-home .pd-h-beliefs span{font-size:.88rem;color:var(--muted)}
@media (max-width:900px){.pd-home .pd-h-teacher{grid-template-columns:minmax(0,1fr)}.pd-home .pd-h-portrait{max-width:360px}}
@media (max-width:640px){.pd-home .pd-h-beliefs{grid-template-columns:minmax(0,1fr)}}

/* ---------- formula sheet download ---------- */
.pd-home .pd-h-magnet{background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 25%,var(--line));border-radius:24px;padding:clamp(26px,5vw,56px);display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(24px,4vw,56px);align-items:center}
.pd-home .pd-h-magnet-copy{display:grid;gap:18px;min-width:0}
.pd-home .pd-h-magnet h2{font-size:clamp(1.8rem,3.2vw,2.6rem)}
.pd-home .pd-h-magnet ul{list-style:none;padding:0;margin:0;display:grid;gap:8px;color:var(--ink-2);font-size:.95rem}
.pd-home .pd-h-magnet li{display:flex;gap:10px;align-items:center;margin:0}
.pd-home .pd-h-magnet li svg{color:var(--accent);flex:none}
.pd-home .pd-h-dlcard{display:grid;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;min-width:0}
.pd-home .pd-h-dlfile{display:flex;gap:14px;align-items:center}
.pd-home .pd-h-ic{width:46px;height:58px;border-radius:6px;border:1px solid var(--line);background:var(--paper);display:grid;place-items:center;font-family:var(--f-mono);font-size:.68rem;font-weight:600;color:var(--bad);flex:none}
.pd-home .pd-h-dlfile b{display:block;color:var(--ink)}
.pd-home .pd-h-dlfile span{font-size:.84rem;color:var(--muted)}
.pd-home .pd-h-dlcard .btn{justify-content:center;white-space:normal;text-align:center}
.pd-home .pd-h-dl.pd-h-busy{pointer-events:none;opacity:.85}
.pd-home .pd-h-dl.pd-h-busy svg{animation:pd-h-dlb .8s ease-in-out infinite}
@keyframes pd-h-dlb{50%{transform:translateY(3px)}}
.pd-home .pd-h-dlrow{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:center}
.pd-home .pd-h-tg{font-size:.85rem;color:var(--accent);font-weight:600;text-align:center}
.pd-home .pd-h-tg:hover{text-decoration:underline;text-underline-offset:3px}
@media (max-width:860px){.pd-home .pd-h-magnet{grid-template-columns:minmax(0,1fr)}}

/* fallback toast (only used when core's PD.toast is unavailable) */
.pd-h-toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--ink);color:var(--paper);padding:12px 18px;border-radius:12px;font-size:.88rem;max-width:min(520px,calc(100vw - 32px));box-shadow:0 12px 30px -10px rgba(0,0,0,.4);transition:opacity .25s,transform .25s;z-index:100;display:flex;gap:10px;align-items:flex-start;line-height:1.45}
.pd-h-toast.show{opacity:1;transform:translate(-50%,0)}
.pd-h-toast svg{flex:none;margin-top:2px}

@media (prefers-reduced-motion:reduce){.pd-home *,.pd-home *::before,.pd-home *::after{transition:none!important;animation:none!important}}