/* Thurston Math Club — shared styles.
   Colors follow the Thurston school site: teal #1b4f6f, gold #fcb42e. */

:root{
  --teal:#1b4f6f;
  --teal-dark:#12364c;
  --teal-soft:#e7f0f5;
  --gold:#fcb42e;
  --gold-deep:#a86a0a;
  --tint:#fff4dc;
  --paper:#fbf8f1;
  --card:#ffffff;
  --ink:#1f2433;
  --muted:#4f6170;
  --line:#d9e1e7;
  --good:#1f7a4d;
  --good-bg:#e5f5ec;
  --warn:#9a4b00;
  --warn-bg:#fff1e0;
  --radius:16px;
  --shadow:0 1px 2px rgba(18,54,76,.06),0 6px 20px rgba(18,54,76,.07);
}

*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:'Nunito',system-ui,sans-serif;font-size:17px;line-height:1.6}
img,svg{max-width:100%}
a{color:var(--teal);text-decoration-thickness:1.5px;text-underline-offset:2px}
a:hover{color:var(--teal-dark)}
h1,h2,h3,h4{font-family:'Fredoka',system-ui,sans-serif;color:var(--teal);line-height:1.15;margin:0 0 .5em}
h1{font-size:clamp(34px,6vw,54px);font-weight:700}
h2{font-size:clamp(26px,4vw,34px);font-weight:700}
h3{font-size:22px;font-weight:600}
p{margin:0 0 1em}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.nw{white-space:nowrap}
.muted{color:var(--muted)}
.small{font-size:15px}

/* ---------- header ---------- */
.site-head{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.site-head .wrap{display:flex;align-items:center;gap:18px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--teal);font-family:'Fredoka',sans-serif;font-weight:700;font-size:21px;white-space:nowrap}
.brand img{width:38px;height:38px;display:block}
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{text-decoration:none;color:var(--ink);font-weight:700;font-size:16px;padding:8px 12px;border-radius:10px}
.nav a:hover{background:var(--teal-soft);color:var(--teal-dark)}
.nav a[aria-current=page]{color:var(--teal);background:var(--teal-soft)}
.nav a.btn{margin-left:8px}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:7px 12px;font:700 15px 'Nunito',sans-serif;color:var(--teal);cursor:pointer}

/* ---------- buttons ---------- */
.btn{display:inline-block;font-family:'Fredoka',sans-serif;font-weight:600;font-size:18px;text-decoration:none;border-radius:999px;padding:10px 22px;border:2px solid transparent;cursor:pointer;line-height:1.2}
.btn-gold{background:var(--gold);color:var(--teal-dark)}
.btn-gold:hover{background:#ffc350;color:var(--teal-dark)}
.btn-teal{background:var(--teal);color:#fff}
.btn-teal:hover{background:var(--teal-dark);color:#fff}
.btn-ghost{border-color:currentColor;color:#fff;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-line{border-color:var(--teal);color:var(--teal);background:#fff}
.btn-line:hover{background:var(--teal-soft)}
.nav .btn{font-size:16px;padding:7px 16px}

/* ---------- hero ---------- */
.hero{background:var(--teal);color:#fff;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:url("../img/symbols.svg");background-size:220px;opacity:.07;pointer-events:none}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:center;padding-top:56px;padding-bottom:60px}
.hero h1{color:#fff;margin-bottom:.25em}
.kicker{font-family:'Fredoka',sans-serif;font-weight:600;color:var(--gold);font-size:19px;margin-bottom:10px}
.hero .lead{font-size:20px;line-height:1.55;max-width:34em;margin-bottom:26px}
.hero .lead strong{color:var(--gold);font-weight:800}

.page-head{background:var(--teal);color:#fff;position:relative;overflow:hidden}
.page-head::before{content:"";position:absolute;inset:0;background-image:url("../img/symbols.svg");background-size:220px;opacity:.07;pointer-events:none}
.page-head .wrap{position:relative;padding-top:40px;padding-bottom:40px}
.page-head h1{color:#fff;margin-bottom:.2em}
.page-head p{font-size:19px;margin:0;max-width:40em}
.page-head .head-actions{margin-top:18px}

/* ---------- cards & sections ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.section{padding:56px 0}
.section + .section{padding-top:0}
.section-title{margin-bottom:18px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tint{background:var(--tint);border-radius:var(--radius);padding:24px 26px}
.tint h3{color:var(--gold-deep)}
.tint > :last-child,.card > :last-child{margin-bottom:0}
.callout{font-family:'Fredoka',sans-serif;font-weight:600;color:var(--teal);font-size:22px;line-height:1.35;border-left:6px solid var(--gold);padding:2px 0 2px 18px;margin:0 0 1.2em}

/* home: today's question card in hero */
.today-card{background:#fff;color:var(--ink);border-radius:20px;padding:24px 24px 22px;box-shadow:0 10px 30px rgba(0,0,0,.18)}
.today-card .label{font-family:'Fredoka',sans-serif;font-weight:600;color:var(--gold-deep);font-size:16px;letter-spacing:.02em;text-transform:uppercase}
.today-card h2{font-size:28px;margin:4px 0 6px}
.today-card p{margin:0 0 14px;color:var(--muted)}
.grade-row{display:flex;gap:8px;flex-wrap:wrap}
.grade-row a,.grade-row button{flex:1 1 0;min-width:52px;text-align:center;text-decoration:none;font-family:'Fredoka',sans-serif;font-weight:600;font-size:15px;color:var(--teal);background:var(--teal-soft);border:2px solid transparent;border-radius:14px;padding:8px 4px 9px;cursor:pointer;line-height:1.1}
.grade-row a b,.grade-row button b{display:block;font-size:26px;font-weight:700}
.grade-row a:hover,.grade-row button:hover{border-color:var(--teal)}
.grade-row [aria-pressed=true]{background:var(--teal);color:#fff}

/* home: schedule of an hour */
.hour{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:8px 0 14px}
.hour .slot{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 16px 14px;border-top:6px solid var(--teal)}
.hour .slot.brk{border-top-color:var(--gold)}
.hour .min{font-family:'Fredoka',sans-serif;font-weight:700;color:var(--teal);font-size:26px;line-height:1}
.hour .min span{font-size:15px;font-weight:600;color:var(--muted)}
.hour .what{font-family:'Fredoka',sans-serif;font-weight:600;font-size:19px;margin:6px 0 4px}
.hour p{font-size:15px;line-height:1.45;margin:0;color:var(--muted)}

/* steps */
.steps{display:grid;gap:18px;counter-reset:step}
.step .num::before{counter-increment:step;content:counter(step)}
.step{display:flex;gap:16px;align-items:flex-start}
.step .num{flex:none;width:42px;height:42px;border-radius:50%;background:var(--teal);color:#fff;font-family:'Fredoka',sans-serif;font-weight:700;font-size:21px;display:flex;align-items:center;justify-content:center}
.step h3{margin:6px 0 4px;font-size:21px}
.step p{margin:0}
.ids{font-size:15px;color:var(--muted);margin-top:4px}


/* ---------- footer ---------- */
.site-foot{background:var(--teal-dark);color:#dfe8ee;margin-top:40px}
.site-foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 32px;padding-top:26px;padding-bottom:28px;font-size:15px}
.site-foot a{color:#fff}
.site-foot .spons{font-family:'Fredoka',sans-serif;font-weight:600;font-size:18px;color:#fff}

/* ---------- prose pages ---------- */
.prose h2{margin-top:1.6em}
.prose h2:first-child{margin-top:0}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1em}
.prose li{margin-bottom:.45em}
.goals{counter-reset:g;list-style:none;padding:0;margin:0 0 1em;display:grid;gap:14px}
.goals li{counter-increment:g;position:relative;padding:16px 18px 16px 64px;background:#fff;border:1px solid var(--line);border-radius:14px;margin:0}
.goals li::before{content:counter(g);position:absolute;left:16px;top:14px;width:34px;height:34px;border-radius:50%;background:var(--gold);color:var(--teal-dark);font-family:'Fredoka',sans-serif;font-weight:700;font-size:19px;display:flex;align-items:center;justify-content:center}
.goals li b{font-family:'Fredoka',sans-serif;font-weight:600;color:var(--teal);font-size:20px;display:block;margin-bottom:2px}
.ideas{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:0 0 1.2em}
.ideas .card{padding:18px 18px 16px}
.ideas h3{font-size:19px;margin-bottom:6px}
.ideas p{font-size:15.5px;margin:0;line-height:1.5}

table.plain{border-collapse:collapse;width:100%;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:16px}
table.plain th,table.plain td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
table.plain th{background:var(--teal-soft);color:var(--teal-dark);font-family:'Fredoka',sans-serif;font-weight:600}
table.plain tr:last-child td{border-bottom:0}

/* ---------- calendar ---------- */
.months{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.month{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.month h3{font-size:20px;margin-bottom:8px}
.month ul{list-style:none;margin:0;padding:0}
.month li{display:flex;justify-content:space-between;gap:10px;padding:6px 0;border-top:1px dashed var(--line);font-weight:700}
.month li:first-child{border-top:0}
.month li .note{font-weight:600;font-size:14px;color:var(--muted)}
.month li.off{color:#9aa7b1;font-weight:600}
.month li.past{color:#9aa7b1}
.month li.next{color:var(--teal-dark)}
.month li.next .note{color:var(--gold-deep);font-weight:800}

/* ---------- Question of the Day ---------- */
.qotd{padding:28px 0 10px}
.preview-bar{background:#2b2b2b;color:#fff;font-weight:700;border-radius:12px;padding:8px 14px;margin-bottom:14px;font-size:15px}
.note-bar{background:var(--tint);color:var(--gold-deep);font-weight:700;border-radius:12px;padding:10px 14px;margin-bottom:14px}
.q-top{display:flex;align-items:center;gap:14px}
.q-date{flex:1;text-align:center}
.q-day{font-weight:800;color:var(--gold-deep);font-size:16px;letter-spacing:.02em}
.q-date h1{font-size:clamp(30px,5vw,44px);margin:2px 0 0}
.nav-arrow{flex:none;width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:30px;line-height:1;text-decoration:none;background:#fff;border:1px solid var(--line);color:var(--teal);padding-bottom:4px}
.nav-arrow:hover{background:var(--teal-soft)}
.nav-arrow.off{opacity:.3;pointer-events:none}
.q-blurb{text-align:center;color:var(--muted);max-width:38em;margin:10px auto 18px;font-size:17px}
.q-grades{max-width:560px;margin:0 auto 22px}
.pick-first{text-align:center;font-family:'Fredoka',sans-serif;font-weight:600;color:var(--teal);font-size:22px;padding:30px 0 40px}
.q-card{padding:26px 28px 24px}
.q-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}
/* the grade buttons above say which grade; this label only shows on paper, where they're hidden */
.q-grade{display:none;font-family:'Fredoka',sans-serif;font-weight:600;font-size:15px;color:#fff;background:var(--teal);border-radius:999px;padding:3px 12px}
.speak{background:var(--teal-soft);border:0;border-radius:999px;padding:6px 14px;font:700 15px 'Nunito',sans-serif;color:var(--teal);cursor:pointer;margin-left:auto}
.speak:hover{background:#d6e6ef}
.q-card h2{font-size:30px;margin:4px 0 12px}
.q-text{font-size:20px;line-height:1.6}
.q-text p{margin:0 0 .7em}
.q-ask{font-size:21px;font-weight:800;color:var(--teal-dark);background:var(--teal-soft);border-radius:12px;padding:12px 16px;margin:6px 0 20px}
.q-ask p{margin:0}
.q-fig{margin:6px 0 16px;text-align:center}
.q-fig svg{height:auto}
.q-fig figcaption{font-size:15px;color:var(--muted)}
.frac{display:inline-flex;align-items:center;gap:2px;vertical-align:middle;margin:0 1px}
.frac .w{font-weight:inherit}
.frac .f{display:inline-flex;flex-direction:column;align-items:center;font-size:.78em;line-height:1.05}
.frac .f span:first-child{border-bottom:2px solid currentColor;padding:0 2px}
.frac .f span:last-child{padding:0 2px}
.hints{border-top:1px dashed var(--line);padding-top:16px}
.hints-label{font-family:'Fredoka',sans-serif;font-weight:600;color:var(--gold-deep);font-size:18px;margin-bottom:10px}
.hint-btns{display:flex;flex-wrap:wrap;gap:8px}
.hint-btn{background:#fff;border:2px solid var(--gold);border-radius:999px;padding:7px 14px;font:700 16px 'Nunito',sans-serif;color:var(--ink);cursor:pointer}
.hint-btn:hover{background:var(--tint)}
.hint-btn[aria-expanded=true]{background:var(--gold);border-color:var(--gold)}
.hint-out:empty{display:none}
.hint-out{display:grid;gap:10px;margin-top:12px}
.hint{background:var(--tint);border-radius:12px;padding:12px 16px;font-size:18px}
.hint p{margin:0}
.hint-k{font-size:14px;font-weight:800;color:var(--gold-deep);margin-bottom:2px}
.answer{border-top:1px dashed var(--line);margin-top:18px;padding-top:16px}
.ans-label{display:block;font-weight:800;margin-bottom:8px}
.ans-row{display:flex;gap:10px;flex-wrap:wrap}
.ans-in{flex:1 1 180px;min-width:0;font:700 22px 'Nunito',sans-serif;padding:10px 14px;border:2px solid var(--line);border-radius:12px;color:var(--ink)}
.ans-in:focus{outline:none;border-color:var(--teal)}
.choices{display:flex;flex-direction:column;gap:8px;max-width:460px}
.choice{text-align:left;background:#fff;border:2px solid var(--line);border-radius:12px;padding:10px 14px;font:700 18px 'Nunito',sans-serif;color:var(--ink);cursor:pointer}
.choice:hover{border-color:var(--teal)}
.choice.right{border-color:var(--good);background:var(--good-bg)}
.choice.wrong{border-color:#e0a46a;background:var(--warn-bg)}
.feedback{margin-top:12px;font-size:18px;border-radius:12px}
.feedback:empty{display:none}
.feedback.good{background:var(--good-bg);color:var(--good);padding:10px 14px}
.feedback.warn{background:var(--warn-bg);color:var(--warn);padding:10px 14px}
.reveal{margin-top:16px}
.show-btn{background:none;border:0;padding:4px 0;font:700 16px 'Nunito',sans-serif;color:var(--muted);text-decoration:underline;text-underline-offset:3px;cursor:pointer}
.show-btn:hover{color:var(--teal)}
.solution{background:#f4f8fa;border-radius:12px;padding:14px 18px;font-size:18px}
.solution h3{font-size:18px;margin:10px 0 4px}
.solution p{margin:0 0 .5em}
.sol-ans{font-size:20px}
.grownups{margin:16px 0 0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 18px}
.grownups summary{cursor:pointer;font-weight:800;color:var(--teal)}
.grownups p{margin:.6em 0 .2em;font-size:16px}
.archive{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:8px 18px}
.archive a{display:flex;justify-content:space-between;gap:10px;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px}
.archive a:hover{border-color:var(--teal)}
.a-date{font-weight:800;color:var(--teal)}
.a-theme{color:var(--muted);text-align:right}
@media (max-width:760px){
  .q-card{padding:20px 18px}
  .q-text{font-size:18.5px}
  .q-ask{font-size:19px}
  .archive{grid-template-columns:1fr}
  .q-top{gap:8px}
  .nav-arrow{width:40px;height:40px}
}
@media print{
  .hints,.answer,.reveal,.q-grades,.nav-arrow,.speak,.archive-wrap{display:none!important}
  .q-grade{display:inline-block}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .hero .wrap{grid-template-columns:1fr;padding-top:40px;padding-bottom:44px}
  .grid-3,.ideas,.months{grid-template-columns:1fr 1fr}
  .hour{grid-template-columns:1fr 1fr}
}
@media (max-width:1000px){
  .site-head .wrap{position:relative}
  .menu-btn{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:8px 16px 14px;gap:2px;box-shadow:0 8px 20px rgba(18,54,76,.08)}
  .nav.open{display:flex}
  .nav a{padding:10px 12px}
  .nav a.btn{margin:6px 0 0;text-align:center}
}
@media (max-width:760px){
  .grid-2,.grid-3,.ideas,.months{grid-template-columns:1fr}
  .section{padding:40px 0}
  .wrap{padding:0 16px}
  body{font-size:16.5px}
  .hero .lead{font-size:18px}
}
@media (max-width:420px){
  .brand{font-size:18px}
  .brand img{width:32px;height:32px}
  .hour{grid-template-columns:1fr}
}
@media print{
  .site-head,.site-foot,.no-print{display:none!important}
  body{background:#fff}
}