/* Spotter 2026 design system: native-feeling, system fonts, grouped surfaces, floating tab bar. */
:root{--c:#2E4BF0;--ci:#1F35C0;--n:#0B1020;--m:#5E6472;--l:#ECEDF1;--s:#E6EAFE;--bg:#F2F3F7;--card:#FFFFFF;--soft:#F2F3F7;--track:#E6E8EE;--bar:rgba(255,255,255,.86);--sheet:#F2F3F7;
--ok:#0B6B47;--okbg:#E3F6EC;--warn:#7A4F00;--warnbg:#FFF1D6;--bad:#9B1C2C;--badbg:#FDE8EB;--nav:68px;--r:22px;--shadow:0 10px 30px rgba(16,24,40,.16);color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{--c:#3F5BFF;--ci:#AFC0FF;--n:#F5F5F7;--m:#A1A1AA;--l:#2C2C2E;--s:#1E2550;--bg:#000000;--card:#1C1C1E;--soft:#2A2A2E;--track:#2C2C30;--bar:rgba(28,28,30,.82);--sheet:#111114;
--ok:#5FD3A2;--okbg:#0F2E22;--warn:#F5C66B;--warnbg:#3A2A0A;--bad:#FF8A98;--badbg:#3A1218;--shadow:0 10px 30px rgba(0,0,0,.5)}}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--n);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,system-ui,sans-serif;line-height:1.45;-webkit-font-smoothing:antialiased;-webkit-text-size-adjust:100%}
body{overscroll-behavior-y:none}
#app{max-width:640px;margin:0 auto;padding:calc(18px + env(safe-area-inset-top)) 18px calc(var(--nav) + 48px + env(safe-area-inset-bottom));animation:spIn .28s ease}
@keyframes spIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes spUp{from{transform:translateY(100%)}to{transform:none}}
@keyframes spFade{from{opacity:0}to{opacity:1}}
@keyframes spPulse{0%,100%{opacity:.55}50%{opacity:1}}
h1{font-weight:800;font-size:34px;line-height:1.1;letter-spacing:-.02em;margin:2px 0 16px}
h2{font-weight:800;font-size:20px;line-height:1.2;letter-spacing:-.01em;margin:0 0 8px}
p{margin:0 0 10px}
.k{font-size:13px;font-weight:600;letter-spacing:.02em;text-transform:uppercase;color:var(--m)}
.sub{color:var(--m);font-size:16px;margin-bottom:16px}
.card{background:var(--card);border:0;border-radius:var(--r);padding:18px 20px;margin-top:14px;transition:transform .18s cubic-bezier(.2,.8,.2,1)}
.card.hi{box-shadow:none}
.row{display:flex;justify-content:space-between;align-items:center;gap:12px}
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
.tile{background:var(--soft);border-radius:16px;padding:12px}
.tile .v{font-size:20px;font-weight:800;line-height:1.15;letter-spacing:-.01em}.tile .l{font-size:12px;color:var(--m);margin-top:3px;font-weight:600}
.pill{display:inline-block;font-size:12px;font-weight:700;padding:5px 10px;border-radius:999px;background:var(--soft);color:var(--m);white-space:nowrap;flex:none}
.pill.ok{background:var(--okbg);color:var(--ok)}.pill.warn{background:var(--warnbg);color:var(--warn)}.pill.bad{background:var(--badbg);color:var(--bad)}
.btn{font:inherit;font-size:16px;font-weight:700;background:var(--c);color:#fff;border:0;border-radius:999px;min-height:50px;padding:13px 22px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:transform .18s cubic-bezier(.2,.8,.2,1),opacity .2s}
.btn:active,.press:active,#nav button:active{transform:scale(.96)}
.btn.quiet{background:var(--soft);color:var(--n);border:0}
.btn.sm{font-size:15px;min-height:44px;padding:10px 16px}
.btn:disabled{opacity:.45;cursor:default}
input,textarea,select{width:100%;font:inherit;font-size:17px;border:0;border-radius:14px;padding:14px 16px;background:var(--soft);color:var(--n);outline:none;transition:box-shadow .15s}
input:focus,textarea:focus,select:focus{box-shadow:0 0 0 3px var(--s)}
textarea{min-height:96px}
label{display:block;font-weight:600;font-size:14px;margin:12px 0 6px;color:var(--m)}
.list .item{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:13px 0;border-top:1px solid var(--l)}
.list .item>.btn,.list .item>.pill{flex:none;align-self:center}
.list .item:first-child{border-top:0}
.item .t{font-weight:600;font-size:16px}.item .s{font-size:14px;color:var(--m)}
.fine{font-size:12.5px;color:var(--m);margin-top:16px;line-height:1.5}
.empty{color:var(--m);font-size:15px;padding:12px 0}
.loading{display:flex;flex-direction:column;gap:14px;margin-top:8px}
.loading div{height:120px;border-radius:var(--r);background:var(--card);animation:spPulse 1.2s ease-in-out infinite}
.loading div:first-child{height:34px;width:55%;border-radius:10px;background:var(--track)}
/* floating tab bar */
#nav{position:fixed;left:12px;right:12px;bottom:calc(14px + env(safe-area-inset-bottom));max-width:520px;margin:0 auto;height:var(--nav);border-radius:34px;padding:6px;display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:2px;background:var(--bar);-webkit-backdrop-filter:saturate(1.8) blur(20px);backdrop-filter:saturate(1.8) blur(20px);box-shadow:var(--shadow);z-index:5}
#nav button{font:inherit;background:none;border:0;border-radius:28px;color:var(--m);font-size:11px;font-weight:700;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;position:relative;transition:transform .18s cubic-bezier(.2,.8,.2,1),background .2s,color .2s}
#nav button svg{width:22px;height:22px}
#nav button.on{background:var(--s);color:var(--ci)}
#nav button .dot{position:absolute;top:8px;right:calc(50% - 16px);width:9px;height:9px;border-radius:5px;background:#FF3B30;border:2px solid var(--card)}
#toast{position:fixed;left:50%;bottom:calc(var(--nav) + 30px + env(safe-area-inset-bottom));transform:translateX(-50%) translateY(20px);background:var(--n);color:var(--bg);padding:12px 18px;border-radius:999px;font-size:15px;font-weight:600;opacity:0;transition:.3s cubic-bezier(.2,.9,.25,1);pointer-events:none;z-index:9;max-width:calc(100% - 40px);text-align:center}
#toast.show{opacity:1;transform:translateX(-50%)}
.chart{width:100%;height:auto;display:block;margin:8px 0}
/* messages */
.msgs{display:flex;flex-direction:column;gap:8px;margin:12px 0}
.msg{max-width:80%;padding:10px 14px;border-radius:20px;font-size:16px;line-height:1.35;background:var(--card);color:var(--n);border-bottom-left-radius:6px}
.msg.me{align-self:flex-end;background:var(--c);color:#fff;border-bottom-left-radius:20px;border-bottom-right-radius:6px}
.msg .who{display:block;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;opacity:.65;margin-bottom:2px}
.faces{display:flex;justify-content:space-between;gap:8px;margin:12px 0}
.faces button{flex:1;font-size:28px;background:var(--soft);border:0;border-radius:16px;padding:10px 0;cursor:pointer;transition:transform .15s}
.faces button:active{transform:scale(.92)}
.faces button.on{background:var(--c)}
.box{border-radius:18px;padding:14px 16px;margin-top:14px;border:0;font-size:15px}
.box.ok{background:var(--okbg)}.box.warn{background:var(--warnbg)}.box.bad{background:var(--badbg)}
.box b{display:block;margin-bottom:2px}
.box .row{gap:8px}
.box input{margin-top:2px;background:var(--card)}
/* sign-in */
.signin{max-width:420px;margin:8vh auto 0}
.signin .logo{width:72px;height:72px;border-radius:18px;display:block;margin-bottom:18px;box-shadow:var(--shadow)}
.signin h1{font-size:40px}
.brand{font-weight:700;font-size:15px;color:var(--m);letter-spacing:.01em}
.seg{display:flex;gap:6px;margin:10px 0;padding:4px;border-radius:14px;background:var(--soft);overflow-x:auto}
.seg button{flex:1;font:inherit;font-size:14px;font-weight:600;border:0;background:transparent;color:var(--n);border-radius:10px;padding:8px 12px;cursor:pointer;white-space:nowrap}
.seg button.on{background:var(--card);box-shadow:0 1px 4px rgba(0,0,0,.12)}
.faq summary{font-weight:600;cursor:pointer;padding:12px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq details{border-top:1px solid var(--l)}
.faq details:first-of-type{border-top:0}
.faq p{font-size:15px;color:var(--m)}
a{color:var(--c)}
/* Today: students, pace ring, next block, due tiles */
.who-bar{display:flex;gap:8px;overflow-x:auto;margin:0 -18px 6px;padding:0 18px 4px;scrollbar-width:none}
.who-bar::-webkit-scrollbar{display:none}
.who-bar button{flex:none;display:flex;align-items:center;gap:8px;height:44px;padding:0 14px 0 6px;border-radius:22px;border:0;font:inherit;font-size:15px;font-weight:600;background:transparent;color:var(--m);cursor:pointer}
.who-bar button.on{background:var(--card);color:var(--n)}
.who-bar i{width:32px;height:32px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-style:normal;font-size:14px;font-weight:700;color:#fff}
.hero{display:flex;align-items:center;gap:18px}
.hero svg{flex:none}
.hero .t{font-size:17px;font-weight:700;margin:8px 0 2px}
.hero .s{font-size:14px;color:var(--m);margin:0}
.next{border-radius:var(--r);padding:20px;margin-top:14px;color:#fff;background:var(--c)}
.next .k{color:rgba(255,255,255,.85)}
.next .when{font-size:26px;font-weight:800;letter-spacing:-.01em;margin:6px 0 2px}
.next p{opacity:.92;font-size:15px}
.next .btn{background:rgba(255,255,255,.22);color:#fff;flex:1}
.next .btn.w{background:#fff;color:var(--ci)}
@media (prefers-color-scheme:dark){.next .btn.w{color:#1F35C0}}
.next .row{gap:8px;justify-content:stretch}
.due{display:flex;align-items:center;gap:14px;padding:12px 0;border-top:1px solid var(--l)}
.due:first-child{border-top:0}
.due .d{width:46px;height:46px;border-radius:13px;flex:none;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--soft)}
.due .d small{font-size:10.5px;font-weight:700;color:var(--m);letter-spacing:.03em}
.due .d b{font-size:17px;line-height:1}
.due .x{flex:1;min-width:0}
.due .x .t{font-size:16px;font-weight:600}.due .x .s{font-size:13px;color:var(--m)}
.tap{display:block;width:100%;text-align:left;font:inherit;color:inherit;cursor:pointer;border:0}
.tap .chev{float:right;opacity:.5}
.hd{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:4px}
.hd span{font-size:14px;color:var(--m)}
@media (min-width:700px){#app{padding-top:40px}}
input,select,textarea{min-width:0;max-width:100%}
input[type=date],input[type=time]{-webkit-appearance:none;appearance:none;min-height:50px;display:block}
input[type=checkbox],input[type=radio]{width:22px;height:22px;accent-color:var(--c);flex:none}
[style*="grid-template-columns"]>*{min-width:0}
label{min-width:0}
.btn{max-width:100%;white-space:normal;text-align:center}
html,body{overflow-x:hidden}
#nav[hidden],[hidden]{display:none!important}
/* plan: week strip + progress bars */
.wk{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px;text-align:center}
.wk div{padding:8px 0;border-radius:14px}
.wk small{display:block;font-size:12px;font-weight:600;color:var(--m)}
.wk b{display:block;font-size:18px;font-weight:800}
.wk i{display:block;width:6px;height:6px;border-radius:3px;margin:4px auto 0;background:var(--c)}
.wk .on{background:var(--c);color:#fff}.wk .on small{color:rgba(255,255,255,.85)}.wk .on i{background:#fff}
.wk .past b{color:var(--m)}
.bar{position:relative;height:10px;border-radius:5px;background:var(--track)}
.bar div{height:10px;border-radius:5px;transition:width .8s cubic-bezier(.2,.8,.2,1)}
.bar span{position:absolute;top:-4px;width:3px;height:18px;border-radius:2px;background:var(--n);transform:translateX(-1px)}
/* sheets */
.sheet-wrap{position:fixed;inset:0;z-index:20}
.sheet-dim{position:absolute;inset:0;background:rgba(8,12,24,.45);animation:spFade .25s ease}
.sheet{position:absolute;left:0;right:0;bottom:0;max-width:640px;margin:0 auto;max-height:88vh;overflow-y:auto;border-radius:28px 28px 0 0;padding:10px 22px calc(28px + env(safe-area-inset-bottom));background:var(--sheet);animation:spUp .38s cubic-bezier(.2,.9,.25,1);transition:transform .2s}
.sheet-wrap.out .sheet{transform:translateY(100%)!important;transition:transform .24s ease-in}
.sheet-wrap.out .sheet-dim{opacity:0;transition:opacity .24s}
.grab{width:40px;height:5px;border-radius:3px;margin:0 auto 12px;background:var(--track)}
.sheet-x{position:absolute;top:14px;right:16px;width:36px;height:36px;border-radius:18px;border:0;background:var(--soft);color:var(--n);display:flex;align-items:center;justify-content:center;cursor:pointer}
.tour{padding-top:14px}
.tour .ico{width:72px;height:72px;border-radius:22px;margin:6px auto 14px;display:flex;align-items:center;justify-content:center;background:var(--s);color:var(--ci)}
.dots{display:flex;justify-content:center;gap:6px;margin:16px 0}
.dots span{width:8px;height:8px;border-radius:4px;background:var(--track);transition:width .2s}
.dots span.on{width:22px;background:var(--c)}
/* pull to refresh */
.ptr{position:fixed;top:calc(10px + env(safe-area-inset-top));left:50%;z-index:15;width:40px;height:40px;border-radius:20px;background:var(--card);color:var(--c);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);opacity:0;transform:translate(-50%,-50px);pointer-events:none}
.ptr.spin{opacity:1;transform:translate(-50%,10px);animation:spSpin .8s linear infinite}
@keyframes spSpin{from{transform:translate(-50%,10px) rotate(0)}to{transform:translate(-50%,10px) rotate(360deg)}}
/* demo bar */
.demo-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 12px;padding:8px 8px 8px 16px;border-radius:999px;background:var(--warnbg);color:var(--warn);font-size:14px;font-weight:600}
.demo-bar button{font:inherit;font-weight:700;border:0;border-radius:999px;padding:8px 14px;background:var(--card);color:var(--n);cursor:pointer;min-height:36px}
button.due{display:flex!important;width:100%;text-align:left;font:inherit;color:inherit;border:0;border-top:1px solid var(--l);cursor:pointer}button.due:first-child{border-top:0}
#app>.tiles .tile{background:var(--card)}

/* Caveat ring motif in the app (v31) */
.ring-load{display:flex;justify-content:center;margin:18px 0 6px;color:var(--c)}
.ring-load svg{width:46px;height:46px}
.ring-load .rl-arc{stroke-dasharray:0 100;animation:rlDraw 1.6s cubic-bezier(.6,0,.3,1) infinite}
@keyframes rlDraw{0%{stroke-dasharray:0 100;opacity:1}60%{stroke-dasharray:75 100;opacity:1}85%{stroke-dasharray:75 100;opacity:1}100%{stroke-dasharray:75 100;opacity:0}}
.ptr svg{display:block}
.ptr.spin svg{animation:spRing .9s linear infinite}
.ptr.spin{animation:none}
@keyframes spRing{to{transform:rotate(-360deg)}}
.empty::before{content:"";display:inline-block;width:14px;height:14px;margin:-2px 9px 0 0;vertical-align:middle;background:var(--c);opacity:.55;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='50' cy='50' r='34' fill='none' stroke='%23000' stroke-opacity='.35' stroke-width='13'/%3E%3Cpath d='M50 16 A34 34 0 0 0 16 50' fill='none' stroke='%23000' stroke-width='13' stroke-linecap='round'/%3E%3Ccircle cx='16' cy='50' r='11' fill='%23000'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='50' cy='50' r='34' fill='none' stroke='%23000' stroke-opacity='.35' stroke-width='13'/%3E%3Cpath d='M50 16 A34 34 0 0 0 16 50' fill='none' stroke='%23000' stroke-width='13' stroke-linecap='round'/%3E%3Ccircle cx='16' cy='50' r='11' fill='%23000'/%3E%3C/svg%3E") center/contain no-repeat}
@media (prefers-reduced-motion:reduce){.ring-load .rl-arc{animation:none;stroke-dasharray:75 100}.ptr.spin svg{animation:none}}