/* Compact look, matching the original Periods 1–2 site. */
:root{--ink:#1a1a1a;--text:#333;--muted:#888;--faint:#aaa;--line:#e0e0e0;--bg:#f4f5f7;--accent:#4f7cac;--accent-dark:#2f5679;--accent-soft:#eaf0f6;--good:#4a9e6a;--mid:#c9943a;--bad:#c0704a}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink);min-height:100vh;line-height:1.45;font-size:14px}
button{font-family:inherit;cursor:pointer;color:inherit}
select{font-family:inherit}
a{color:inherit}
button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
[hidden]{display:none!important}
.wrap{max-width:640px;margin:0 auto;padding:12px 14px 32px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---- home and unit menu ---- */
.crumb{display:inline-block;font-size:13px;color:#666;text-decoration:none;padding:4px 0;margin-bottom:8px}
.crumb:hover{color:var(--ink)}
h1{font-size:21px;font-weight:600}
.sub{color:#666;font-size:13px;margin-top:2px}
.menu-head{display:flex;justify-content:space-between;align-items:center;gap:10px 16px;flex-wrap:wrap}
.search{flex:0 1 280px}
@media (max-width:520px){.search{flex-basis:100%}}
.search input{width:100%;padding:9px 12px;border:1px solid #ccc;border-radius:10px;background:#fff;font-size:15px;font-family:inherit}
.search input:focus{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}
.results{display:flex;flex-direction:column;gap:6px;margin-top:12px}
.result{display:flex;justify-content:space-between;align-items:baseline;gap:12px;width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:8px;padding:9px 12px}
.result:hover{border-color:var(--accent)}
a.result{text-decoration:none}
.rname{font-size:14px;font-weight:600;color:var(--accent-dark);line-height:1.35}
.rwhere{font-size:11px;color:var(--muted);white-space:nowrap}
.noresults{font-size:13px;color:var(--muted);padding:6px 2px}
.decks{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.deck{display:block;width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;text-decoration:none;color:var(--ink)}
button.deck:hover,a.deck:hover{border-color:var(--accent)}
.deck.soon{opacity:.55;cursor:default}
.dname{display:block;font-size:15px;font-weight:600}
.ddesc{display:block;font-size:12px;color:#666;margin-top:1px}
.dmeta{display:block;font-size:11px;color:var(--muted);margin-top:6px}
.bar{display:flex;height:4px;border-radius:2px;overflow:hidden;background:#ececec;margin-top:5px}
.bar .s3{background:var(--good)} .bar .s2{background:var(--mid)} .bar .s1{background:var(--bad)}
.settings{display:flex;gap:10px;align-items:center;margin-top:18px;font-size:12px;color:var(--muted)}
.settings select{padding:3px 5px;border:1px solid #ccc;border-radius:6px;background:#fff;font-size:12px}
.link{background:none;border:none;color:var(--accent-dark);text-decoration:underline;font-size:12px;padding:2px}
.account{margin-top:14px;font-size:12px;color:var(--muted)}
.account strong{color:var(--ink);font-variant-numeric:tabular-nums;letter-spacing:.05em}
.acct-form{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.acct-form input{width:6.5em;padding:4px 8px;border:1px solid #ccc;border-radius:6px;font-size:14px;font-variant-numeric:tabular-nums;letter-spacing:.06em;font-family:inherit}
.acct-form input::placeholder{letter-spacing:0;color:#aaa;font-size:13px}
.acct-form .btn{padding:4px 12px;font-size:13px}
.acct-msg{margin-top:6px;color:#9a5a3a}
/* Home: title with the Betsy Ross flag mark at the right */
.home-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.home-head .logo{flex:none;width:56px;height:56px;margin:2px 12px 0 0}
@media (max-width:480px){.home-head .logo{width:44px;height:44px;margin-right:4px}}
/* Home: Teachers and Students buttons, then search */
.home-row{display:flex;flex-wrap:wrap;gap:8px;align-items:stretch;margin-top:14px}
.roles{display:flex;gap:8px}
.role{width:auto;display:flex;flex-direction:column;justify-content:center;padding:7px 18px;border-color:#c9d6e4}
.role:hover{border-color:var(--accent)}
.role .dname{font-size:14px;color:var(--accent-dark)}
.role .ddesc{margin-top:0}
.home-search{flex:1 1 220px}
.home-search input{height:100%}
@media (max-width:520px){.roles{flex:1 1 100%}.role{flex:1}.home-search{flex-basis:100%}}
/* Student code page */
.code-box{margin-top:14px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:10px;font-size:14px;color:#444}
.code-box .acct-form label{width:100%;color:#555}
.code-box .acct-form input{width:7.5em;padding:7px 10px;font-size:16px}
.code-box .acct-form .btn{padding:7px 14px;font-size:14px}
.code-box strong{color:var(--ink);font-variant-numeric:tabular-nums;letter-spacing:.05em}
.code-actions{margin-top:12px;display:flex;gap:14px;align-items:center}
.code-actions .btn{text-decoration:none}
.units{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:16px}
.units .deck{padding:10px 12px}
.units .dname{font-size:15px}
.units .dmeta{margin-top:4px}
.units .deck{position:relative}
.tbar{margin-top:8px}
@media (max-width:300px){.units{grid-template-columns:1fr}}

/* ---- study view: just the card ---- */
.topbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin-bottom:8px;min-height:30px}
.topbar .menu-btn{justify-self:start;grid-column:1}
.topbar .tb-mid{grid-column:2;display:flex;gap:6px}
.topbar .pos{justify-self:end;grid-column:3}
.menu-btn{background:none;border:none;font-size:13px;color:#666;padding:4px 6px 4px 0}
.menu-btn:hover{color:var(--ink)}
.pos{font-size:12px;color:var(--muted);white-space:nowrap}
.order-btn{display:flex;align-items:center;justify-content:center;width:44px;height:30px;border:1px solid #ccc;border-radius:6px;background:#fff;color:#555;padding:0}
.order-btn:hover{color:var(--ink);border-color:#999}
.order-btn.on{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-dark)}
.order-btn.on:hover{color:var(--accent-dark);border-color:var(--accent-dark)}
.order-btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* the flip card: both faces share one grid cell, so the card is as tall as its taller face */
.flip{perspective:1800px;cursor:pointer;-webkit-tap-highlight-color:transparent}
.flip:focus{outline:none}
.flip:focus-visible .face{outline:2px solid var(--ink);outline-offset:2px}
.flip-inner{display:grid;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.3,.7,.25,1)}
.flip.flipped .flip-inner{transform:rotateY(180deg)}
.flip.no-anim .flip-inner{transition:none}
.flip .flip-inner.turn-out{transform:rotateY(270deg);transition:transform .23s ease-in}
/* a card still showing its front (a graded quiz card) turns edge-on the short way, without passing its back */
.flip:not(.flipped) .flip-inner.turn-out{transform:rotateY(90deg)}
.flip .flip-inner.turn-in{transform:rotateY(90deg);transition:none}
.flip .flip-inner.turn-settle{transition:transform .25s ease-out}
.face{grid-area:1/1;-webkit-backface-visibility:hidden;backface-visibility:hidden;background:#fff;border:1.5px solid #ddd;border-radius:12px;padding:16px 18px 18px;display:flex;flex-direction:column;height:var(--card-h,min(370px,calc(100svh - 130px)));overflow-y:auto;overscroll-behavior:contain}
.face.back{transform:rotateY(180deg);border-color:#c9d6e4;background:#fbfcfd}
.face.front .face-body{flex:1;display:flex;flex-direction:column;justify-content:center;text-align:center;max-width:500px;margin:0 auto;padding:8px 0}
.tap{font-size:11px;color:var(--faint);text-align:center;margin-top:10px}
@media (prefers-reduced-motion:reduce){.flip-inner{transition:none}}

.card-top{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.badge{font-size:11px;font-weight:600;letter-spacing:.03em;padding:2px 9px;border-radius:20px;background:var(--accent-soft);color:var(--accent-dark);white-space:nowrap}
.back .badge{background:#edf6ef;color:#2f6b43}
.eyebrow{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.prompt{font-size:18px;line-height:1.5;font-weight:500;color:#111}
.big{font-size:34px;line-height:1.1;font-weight:700;letter-spacing:.02em}
.hint{margin-top:10px;color:var(--muted);font-size:13px}
.card-context{font-size:13px;line-height:1.45;color:#555;margin:-2px 0 0}
.ctx-lo{display:block;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:2px}
.prompt,.ask,.hint{text-wrap:balance}
.measure{position:absolute;left:-9999px;top:0;visibility:hidden;pointer-events:none}
.measure .face{height:auto!important;min-height:0!important;overflow:visible!important;transform:none!important;position:static}
.ask{margin:16px auto 0;font-size:14px;font-weight:500;color:var(--accent-dark);background:var(--accent-soft);border-radius:10px;padding:6px 14px;width:fit-content;max-width:100%}
.ask strong{font-weight:700}
.whys p{margin-top:6px;font-size:14px;color:var(--text)}

/* objective back */
.hdlist{list-style:none;display:grid;gap:8px}
/* Each concept on an objective's answer side is a full-width tile, styled like the key-term tiles. */
.hdcard{width:100%;display:grid;grid-template-columns:auto 1fr;gap:0 10px;align-items:start;text-align:left;background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font:inherit;color:inherit;cursor:pointer}
.hdcard:hover{border-color:var(--accent)}
.hdcard .num{align-self:start;margin-top:1px}
.hdbody{display:flex;flex-direction:column;gap:2px;min-width:0}
.hdtitle{font-size:14px;font-weight:600;line-height:1.35;color:var(--accent-dark)}
.hdwhy{font-size:12.5px;line-height:1.45;color:#666}
.hdhead{display:flex;justify-content:space-between;align-items:flex-start;gap:8px}
.hdterms{flex:none;font-size:11px;font-weight:600;line-height:1.4;color:var(--muted);background:#f1f3f5;border-radius:20px;padding:1px 8px;white-space:nowrap}
.num{font-variant-numeric:tabular-nums;font-weight:600;font-size:13px;color:var(--accent-dark);min-width:2.9em;margin-top:1px}

/* concept back */
.backtitle{font-size:13px;font-weight:600;line-height:1.35;color:#666;margin-bottom:10px}
.backtitle.has-why{margin-bottom:2px}
.backwhy{font-size:12.5px;line-height:1.45;color:#666;margin-bottom:10px}
/* Answer line: how a concept answers its objective (never names a term, so it can sit on the front). */
.why{font-size:14px;line-height:1.5;color:#666;margin-top:8px;text-wrap:balance}
.tiles{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tile{width:100%;height:100%;min-height:54px;display:flex;justify-content:space-between;align-items:center;gap:8px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px;font-weight:600;line-height:1.3;color:var(--accent-dark)}
.tile span{color:var(--faint);font-size:18px;font-weight:400}
.tile:hover{border-color:var(--accent)}

/* term card */
.tterm{font-size:19px;font-weight:700;line-height:1.3;color:var(--accent-dark)}
.tdesc{font-size:15px;line-height:1.6;color:var(--text);margin-top:8px}
.pmeta{font-size:13px;line-height:1.5;color:#666;margin-top:4px}
.pkeys{margin-top:14px}
a.tile{text-decoration:none}
/* Term image: at least 120px tall plus caption (what the card sizing measures), growing into any spare room. */
.timg{flex:1 1 0;max-height:330px;display:flex;flex-direction:column;margin:10px 0 2px}
.timg img{flex:1 1 0;min-height:120px;width:100%;object-fit:contain}
.timg figcaption{font-size:11px;line-height:1.4;color:#888;text-align:center;margin-top:5px}
.tfoot{margin-top:auto;padding-top:14px;font-size:11px;line-height:1.5;color:var(--muted)}
.hdbox{margin-top:12px;padding-top:10px;border-top:.5px solid var(--line);font-size:11px;line-height:1.5;color:#666}
.hdbox .eyebrow{font-size:10px;margin-bottom:3px}
.hdbox p{font-style:italic}
.hdbox .eyebrow,.hdbox .parent{font-style:normal}
.hdbox .parent{margin-top:6px;font-size:11px;color:var(--muted)}
.hdbox .parent em{font-style:italic}
.hdbox .link{font-size:11px}

/* controls under the card: ‹  [Missed] [Close] [Got it]  › */
.controls{display:flex;gap:8px;align-items:center;margin-top:10px}
.nav{flex:1 1 0;min-width:48px;height:34px;border:1px solid #ccc;border-radius:6px;background:#fff;font-size:20px;line-height:1;color:#333}
.nav:disabled{opacity:.35;cursor:default}
.rate{flex:0 0 auto;display:grid;grid-template-columns:repeat(3,92px);gap:6px;visibility:hidden;opacity:0;transition:opacity .2s}
.rate.show{visibility:visible;opacity:1}
.rbtn{height:34px;border-radius:6px;border:1px solid;font-size:13px;font-weight:500}
.rbtn.miss{border-color:#d08060;background:#fff5f0;color:var(--bad)}
.rbtn.mid{border-color:#d8b070;background:#fdf7ec;color:#9a6a1c}
.rbtn.good{border-color:#60a070;background:#f0faf4;color:var(--good)}
.rbtn.miss.on{background:var(--bad);border-color:var(--bad);color:#fff}
.rbtn.mid.on{background:var(--mid);border-color:var(--mid);color:#fff}
.rbtn.good.on{background:var(--good);border-color:var(--good);color:#fff}
.rbtn.on{font-weight:600}

.done{background:#fff;border:1.5px solid #ddd;border-radius:12px;padding:20px 18px;text-align:center}
.done h2{font-size:17px;font-weight:600}
.done p{margin-top:6px;color:#666;font-size:13px}
.actions{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap;justify-content:center}
.btn{padding:7px 14px;border-radius:6px;border:1px solid #ccc;background:#fff;font-size:13px}
.btn.primary{background:#111;color:#fff;border-color:#111}

@media (max-width:480px){
  .prompt{font-size:17px}
}
@media (max-width:480px){.rate{flex:0 1 230px;grid-template-columns:repeat(3,1fr)}.nav{min-width:40px}}
/* Phones swipe between cards: no ‹ › buttons, so the ratings span the row, and multiple choice has no row at all */
@media (max-width:600px) and (pointer:coarse){.controls .nav{display:none}.controls .rate{flex:1}.controls.mc-row{display:none}}
/* Swipe on touch screens: the card follows the finger (app.js), and the new card slides in from the side. */
.flip{touch-action:pan-y}
@keyframes slide-next{from{transform:translateX(70px) rotate(2deg);opacity:0}to{transform:none;opacity:1}}
@keyframes slide-prev{from{transform:translateX(-70px) rotate(-2deg);opacity:0}to{transform:none;opacity:1}}
.flip.slide-next{animation:slide-next .24s cubic-bezier(.2,.8,.3,1)}
.flip.slide-prev{animation:slide-prev .24s cubic-bezier(.2,.8,.3,1)}
/* Full-screen image (app.js zoom) */
.timg img{cursor:zoom-in}
.lightbox{position:fixed;inset:0;z-index:50;background:rgba(10,12,16,.92);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:44px 16px 20px;cursor:zoom-out;touch-action:pinch-zoom}
.lightbox img{max-width:100%;max-height:calc(100% - 64px);object-fit:contain;border-radius:4px}
.lightbox p{color:#d6d9de;font-size:13px;line-height:1.45;text-align:center;max-width:640px;margin-top:12px}
.lb-close{position:absolute;top:8px;right:12px;background:none;border:none;color:#fff;font-size:30px;line-height:1;padding:4px 8px;cursor:pointer}
/* Multiple choice (app.js): the prompt, then four answers; green for right, red for a wrong pick */
.mc{flex:1;display:flex;flex-direction:column;justify-content:center;max-width:520px;width:100%;margin:0 auto;padding:4px 0}
.mc-prompt{font-size:15px;line-height:1.6;color:var(--text)}
.mc-opts{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.mc-opt{width:100%;text-align:left;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:14px;line-height:1.35;color:var(--ink);cursor:pointer}
.mc-opt:hover{border-color:var(--accent)}
.mc-opt.right{background:#edf6ef;border-color:var(--good);color:#2f6b43}
.mc-opt.wrong{background:#fbeeea;border-color:var(--bad);color:#8a3f22}
.mc-opt.graded{cursor:pointer}
.mc-opt.graded:hover{text-decoration:underline;text-decoration-color:#9fb6cc;text-underline-offset:3px}
.rate-space{flex:1}
.due-n{color:var(--accent-dark);font-weight:600}
.loading{padding:40px 0;text-align:center;color:var(--muted);font-size:14px}
/* Home: Due today entry and each period's due count */
.due-tile{margin-top:12px;display:flex;align-items:center;gap:6px 14px;flex-wrap:wrap;border-color:var(--accent)}
.due-tile .dname{color:var(--accent-dark)}
.due-tile .ddesc{margin-top:0;flex:1}
.due-go{font-size:13px;font-weight:600;color:var(--accent-dark)}
.due-tile.caught-up{border-color:var(--line);cursor:default}
.ddue{display:block;font-size:11px;font-weight:600;color:var(--accent-dark);margin-top:4px}
.due-tile.searching{display:none}
a.btn{display:inline-block;text-decoration:none}
/* Select all that apply (concepts): picked, then once graded: right, wrong, or a right answer left out */
.mc-head{font-size:18px;font-weight:500;color:#111}
.mc-multi{max-width:none;margin:0}
.mc-title{all:unset;cursor:pointer;text-decoration:underline;text-decoration-color:#9fb6cc;text-underline-offset:4px}
.mc-title:hover{text-decoration-color:var(--accent)}
.mc-band{margin:-16px -18px 14px;padding:12px 18px 12px;background:#f3f6f9;border-bottom:1px solid #e3e9ef;border-radius:11px 11px 0 0}
.mc-band .card-top{margin-bottom:6px}
.band-lo{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.band-text{font-size:13px;line-height:1.45;color:#555}
.mc-sub{font-size:14px;line-height:1.5;color:#666;margin-top:6px}
.mc-count{font-size:12px;font-weight:600;color:var(--accent-dark);margin-top:10px;height:20px;display:flex;align-items:center} /* fixed height: the result tag appears without moving anything */
.mc-count+.mc-opts{margin-top:8px}
.mc-result{margin-left:8px;padding:0 9px;line-height:20px;border-radius:20px;font-size:12px;font-weight:600}
.mc-result.g3{background:#edf6ef;color:#2f6b43}
.mc-result.g2{background:#fbf3e3;color:#8a6420}
.mc-result.g1{background:#fbeeea;color:#8a3f22}
.mc-opt.sel{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-dark)}
.mc-opt.missed{border:2px dashed var(--good)}
/* Learning strip under multiple-choice cards: got it, learning (right once), missed */
.learnbar{margin-top:10px}
.learnbar .bar{height:6px;border-radius:3px;margin-top:0}
.lb-text{font-size:11px;color:var(--muted);margin-top:5px;text-align:center}
.lb-note{white-space:nowrap}