/* ============================================================
   EduMind AI — app.css  (design system v2)
   Idea: a maths exercise book. Ink-blue on graph paper, with a
   single orange marker for everything that matters.
   Type: Barlow Condensed (display, numerals) + Plus Jakarta Sans (text)
   ============================================================ */

:root{
  --brand:#F26B1D; --brand-d:#BE4608; --brand-t:#FFEADB; --brand-tint:#FFF5EC;
  --navy:#0E1B33; --navy-2:#17294A;
  --bg:#F3F6FB; --bg-2:#E9EEF7; --card:#FFFFFF;
  --ink:#12203A; --ink-2:#44536E; --mute:#667590; --mute-2:#98A4B8;
  --line:#DCE3EF; --line-2:#E8EDF5;
  --ok:#11794A; --ok-t:#DCF3E6; --bad:#C62828; --bad-t:#FCE3E3; --warn:#A85A05; --warn-t:#FCEFD3;
  --grid:rgba(120,150,210,.16);
  --sh-1:0 1px 2px rgba(18,32,58,.05),0 1px 1px rgba(18,32,58,.03);
  --sh-2:0 2px 4px rgba(18,32,58,.04),0 8px 24px rgba(18,32,58,.07);
  --sh-3:0 4px 8px rgba(18,32,58,.06),0 20px 48px rgba(18,32,58,.14);
  --r-s:12px; --r-m:16px; --r-l:22px; --r-xl:28px;
  --font-body:"Plus Jakarta Sans",ui-rounded,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-display:"Barlow Condensed","Arial Narrow",system-ui,sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
  /* graph-paper grid + a plotted curve, used on the dark panels */
  --paper-grid:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  --curve:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 200' fill='none'%3E%3Cpath d='M0 190C70 188 120 170 170 120S290 20 400 14' stroke='%23F26B1D' stroke-width='3' stroke-linecap='round'/%3E%3Ccircle cx='170' cy='120' r='6' fill='%230E1B33' stroke='%23F26B1D' stroke-width='3'/%3E%3C/svg%3E");
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#0A1325; --bg-2:#101C34; --card:#111E37; --ink:#E9EFFB; --ink-2:#BCC8DE; --mute:#8E9DB8; --mute-2:#62728F;
  --line:#22324F; --line-2:#192743; --brand-t:#33200F; --brand-tint:#241709; --brand-d:#FF9A5C;
  --ok:#4ADE80; --ok-t:#0F2D1D; --bad:#FF7A7A; --bad-t:#341515; --warn:#F5B454; --warn-t:#332609;
  --navy:#0B1630; --navy-2:#142548; --grid:rgba(120,150,210,.10);
  --sh-1:0 1px 2px rgba(0,0,0,.35); --sh-2:0 8px 24px rgba(0,0,0,.35); --sh-3:0 20px 48px rgba(0,0,0,.5)}}
:root[data-theme=dark]{
  --bg:#0A1325; --bg-2:#101C34; --card:#111E37; --ink:#E9EFFB; --ink-2:#BCC8DE; --mute:#8E9DB8; --mute-2:#62728F;
  --line:#22324F; --line-2:#192743; --brand-t:#33200F; --brand-tint:#241709; --brand-d:#FF9A5C;
  --ok:#4ADE80; --ok-t:#0F2D1D; --bad:#FF7A7A; --bad-t:#341515; --warn:#F5B454; --warn-t:#332609;
  --navy:#0B1630; --navy-2:#142548; --grid:rgba(120,150,210,.10);
  --sh-1:0 1px 2px rgba(0,0,0,.35); --sh-2:0 8px 24px rgba(0,0,0,.35); --sh-3:0 20px 48px rgba(0,0,0,.5)}

/* ---------- Base ---------- */
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.55 var(--font-body);
  -webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;overflow-x:hidden}
h1,h2,h3,h4,p{margin:0}
h1,h2,h3{letter-spacing:-.02em}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:6px}
[hidden]{display:none!important}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:var(--brand);color:#fff}
.mute{color:var(--mute);font-size:14px}
.mute-2{color:var(--mute-2);font-size:13px}
.row{display:flex;justify-content:space-between;align-items:center;gap:12px}
.view-title,.login-title,.complete-title{font-family:var(--font-display);font-weight:700;letter-spacing:0;line-height:1.02}

/* ---------- Buttons, fields, pills ---------- */
.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:54px;padding:0 22px;border-radius:var(--r-m);
  background:var(--brand);color:#fff;font-weight:700;font-size:16px;letter-spacing:-.005em;
  box-shadow:0 1px 0 rgba(255,255,255,.25) inset,0 8px 20px -6px rgba(242,107,29,.55);
  transition:transform .12s var(--ease),box-shadow .2s,background .2s}
.btn:hover{background:#E25F13}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.55;cursor:not-allowed;box-shadow:none}
.btn.ghost{background:var(--brand-t);color:var(--brand-d);box-shadow:none}
.btn.ghost:hover{background:var(--brand-t);filter:brightness(.97)}
.link{color:var(--brand-d);font-weight:700;padding:10px 6px;font-size:15px}
.link:disabled{color:var(--mute-2);cursor:default}
.link-back{display:block;margin:12px auto 0;font-size:14px}
.field{width:100%;min-height:56px;padding:0 18px;border:1.5px solid var(--line);border-radius:var(--r-m);background:var(--card);color:var(--ink);
  font:inherit;margin-bottom:12px;transition:border-color .2s,box-shadow .2s}
.field:focus{border-color:var(--brand);outline:0;box-shadow:0 0 0 4px var(--brand-t)}
.err-msg{color:var(--bad);min-height:22px;font-size:14px;font-weight:500;margin:2px 0 8px}
.sub{color:var(--mute);font-size:15px;margin-bottom:22px;max-width:46ch}
.pill{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:700;padding:5px 12px;border-radius:99px;
  background:var(--ok-t);color:var(--ok);font-variant-numeric:tabular-nums;transition:background .2s,color .2s}
.pill::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;flex:0 0 7px}
.pill.off{background:var(--brand-t);color:var(--brand-d)}
.pill.off::before{animation:blink 1.4s ease-in-out infinite}
.pill.offline{background:var(--bg-2);color:var(--mute)}
.pill.bad{background:var(--bad-t);color:var(--bad)}
@keyframes blink{50%{opacity:.3}}
#sync{cursor:pointer;user-select:none}
button.pill{min-height:36px;padding:0 14px;background:var(--bg-2);color:var(--ink-2);border:1px solid var(--line)}
button.pill::before{display:none}
button.pill.off{background:var(--brand-t);color:var(--brand-d);border-color:transparent}
button.pill:active{transform:scale(.96)}

/* ============================================================
   LANDING
   ============================================================ */
#landing{max-width:780px;margin:0 auto}
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;overflow:hidden;color:#fff;padding:0 22px 30px;isolation:isolate;background:var(--navy)}
.hero-bg{position:absolute;inset:0;z-index:-2;
  background:var(--curve) right -30px top 84px/min(110%,560px) no-repeat,
    radial-gradient(70% 45% at 100% 0%,rgba(242,107,29,.30),transparent 70%),
    var(--paper-grid),linear-gradient(170deg,#0E1B33 0%,#0A1427 100%);
  background-size:min(110%,560px),auto,36px 36px,36px 36px,auto}
.hero-grain{display:none}
.nav{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;padding:18px 0 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.brand i{width:34px;height:34px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;
  font:700 22px/1 var(--font-display);font-style:normal}
.brand b{color:var(--brand)}
.brand span{font-size:16px;letter-spacing:-.01em}
.hamburger{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;color:#fff;background:rgba(255,255,255,.09);
  border:1px solid rgba(255,255,255,.18);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);transition:transform .15s,background .2s}
.hamburger:hover{background:rgba(255,255,255,.16)}
.hamburger:active{transform:scale(.94)}
.hero-inner{flex:1;display:flex;flex-direction:column;justify-content:flex-end;position:relative;z-index:2;padding-bottom:28px}
.hero-title{font-family:var(--font-display);font-weight:800;text-transform:uppercase;font-size:clamp(68px,21vw,128px);line-height:.82;letter-spacing:-.01em;margin-bottom:22px}
.hero-title .line{display:block;opacity:0;transition:opacity .8s var(--ease),transform .9s var(--ease)}
.line-l{transform:translateX(-48px)}
.line-r{transform:translateX(48px);text-align:right;color:transparent;-webkit-text-stroke:2.5px var(--brand)}
.line.in{opacity:1;transform:none}
.hero-sub{color:rgba(255,255,255,.82);font-size:clamp(15px,3.8vw,18px);max-width:34ch;margin-bottom:26px}
.cta-pill{display:inline-flex;align-items:center;gap:14px;padding:10px 10px 10px 24px;border-radius:99px;background:var(--brand);color:#fff;
  font-weight:700;font-size:17px;align-self:flex-start;box-shadow:0 14px 34px -8px rgba(242,107,29,.65);transition:transform .25s var(--ease),background .2s}
.cta-pill:hover{background:#E25F13;color:#fff}
.cta-pill:active{transform:scale(.97)}
.cta-arrow{width:38px;height:38px;border-radius:50%;background:#fff;color:var(--brand-d);display:grid;place-items:center}
.cta-arrow i{display:block;font-size:20px;transform:rotate(-45deg);transition:transform .35s var(--ease)}
.cta-pill:hover .cta-arrow i{transform:none}
.cta-pill-lg{padding:12px 12px 12px 28px;font-size:19px}
.hero-note{color:rgba(255,255,255,.62);font-size:13.5px;margin-top:16px}
.scroll-hint{position:absolute;bottom:14px;right:22px;display:flex;flex-direction:column;align-items:center;gap:4px;color:rgba(255,255,255,.5);font-size:12px;animation:float 2.4s ease-in-out infinite}
@keyframes float{50%{transform:translateY(6px)}}

.section{padding:clamp(64px,10vh,112px) 22px;max-width:780px;margin:0 auto}
.eyebrow{font-size:14px;font-weight:700;color:var(--brand-d);margin-bottom:10px;display:flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:22px;height:3px;border-radius:3px;background:var(--brand)}
.section-title{font-family:var(--font-display);font-weight:800;text-transform:uppercase;font-size:clamp(48px,13vw,80px);line-height:.9;margin-bottom:34px;color:var(--ink)}
.section-title .accent{display:block;font:600 clamp(19px,4.8vw,26px)/1.25 var(--font-body);text-transform:none;letter-spacing:-.01em;color:var(--mute);margin-top:10px}
.section-why{background:var(--bg)}
.features{display:grid;gap:14px;margin-bottom:32px}
.feature{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);padding:22px 22px 22px 26px;box-shadow:var(--sh-1);overflow:hidden}
.feature::before{content:"";position:absolute;left:0;top:18px;bottom:18px;width:4px;border-radius:0 4px 4px 0;background:var(--brand)}
.feature-num{display:none}
.feature h3{font-size:18px;font-weight:800;margin-bottom:6px}
.feature p{color:var(--mute);font-size:15px}
.quote{position:relative;overflow:hidden;border-radius:var(--r-xl);padding:30px 26px;color:#fff;background:var(--paper-grid),var(--navy);background-size:32px 32px,32px 32px,auto}
.quote::after{content:"";position:absolute;right:-30px;bottom:-30px;width:180px;height:90px;background:var(--curve) center/contain no-repeat;opacity:.7}
.quote-text{position:relative;font-size:17px;line-height:1.6;max-width:36ch;color:rgba(255,255,255,.92)}
.section-how{background:var(--bg-2)}
.steps{list-style:none;padding:0;margin:0;display:grid;gap:0;position:relative}
.step{position:relative;display:flex;gap:18px;align-items:flex-start;padding:0 0 26px}
.step:not(:last-child)::before{content:"";position:absolute;left:21px;top:46px;bottom:4px;width:2px;background:repeating-linear-gradient(var(--mute-2) 0 4px,transparent 4px 9px)}
.step-num{width:44px;height:44px;flex:0 0 44px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font:700 24px/1 var(--font-display)}
.step h3{font-size:17px;font-weight:800;margin:6px 0 4px}
.step p{color:var(--mute);font-size:15px}
.section-close{text-align:center;background:var(--bg)}
.close-title{font-family:var(--font-display);font-weight:800;text-transform:uppercase;font-size:clamp(64px,19vw,116px);line-height:.86;color:var(--ink)}
.close-sub{color:var(--ink-2);max-width:38ch;margin:14px auto 28px}
.section-close .cta-pill{align-self:center;margin:0 auto}
.footer-note{font-size:13px;color:var(--mute);max-width:46ch;margin:24px auto 0}
.site-footer{display:flex;align-items:center;justify-content:space-between;padding:22px;border-top:1px solid var(--line);max-width:780px;margin:0 auto}
.brand-footer i{width:28px;height:28px;font-size:18px;border-radius:8px}
.brand-footer span{font-size:14px}
.site-footer p{color:var(--mute);font-size:13px}
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============================================================
   LOGIN + PICKER
   ============================================================ */
#login,#picker{min-height:100svh;display:flex;align-items:center;justify-content:center;padding:32px 20px;
  background:radial-gradient(60% 40% at 90% 0%,rgba(242,107,29,.16),transparent 70%),var(--paper-grid),var(--bg);background-size:auto,34px 34px,34px 34px,auto}
.login-wrap{width:100%;max-width:440px;display:flex;flex-direction:column;gap:18px}
.login-brand{display:flex;align-items:center;gap:10px;justify-content:center;margin-bottom:6px}
.login-brand .logo{width:46px;height:46px;border-radius:14px;background:var(--brand);color:#fff;display:grid;place-items:center;font:700 28px/1 var(--font-display);box-shadow:0 10px 24px -6px rgba(242,107,29,.6)}
.login-brand span{font-weight:800;font-size:18px;letter-spacing:-.01em}
.login-brand b{color:var(--brand)}
.login-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-xl);padding:28px 22px;box-shadow:var(--sh-3);animation:rise .5s var(--ease) both}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.login-title{font-size:38px;margin-bottom:8px}
.login-card label{display:block;font-size:14px;font-weight:700;margin-bottom:8px}
.legal{color:var(--mute);font-size:13px;text-align:center;line-height:1.6}
#picker .menu-group{margin-bottom:14px}
.pk-av{width:42px;height:42px;flex:0 0 42px;border-radius:50%;background:var(--navy);color:#fff;font:700 20px/1 var(--font-display);display:grid;place-items:center;overflow:hidden}
.pk-av img{width:100%;height:100%;object-fit:cover}
.otp{display:flex;gap:8px;justify-content:space-between;margin:14px 0 4px}
.otp input{flex:1;min-width:0;height:62px;text-align:center;font:700 28px/1 var(--font-display);border:1.5px solid var(--line);border-radius:var(--r-m);
  background:var(--card);color:var(--ink);transition:border-color .2s,background .2s,transform .2s,box-shadow .2s}
.otp input:focus{border-color:var(--brand);outline:0;transform:translateY(-2px);box-shadow:0 6px 16px -6px rgba(242,107,29,.5)}
.otp.pin{max-width:260px;margin:16px auto 4px}
.otp.bad{animation:shake .5s}
.otp.bad input{border-color:var(--bad);background:var(--bad-t);color:var(--bad)}
.otp.good input{border-color:var(--ok);background:var(--ok-t);color:var(--ok);animation:pop .4s both}
.otp.good input:nth-child(2){animation-delay:.05s}.otp.good input:nth-child(3){animation-delay:.1s}
.otp.good input:nth-child(4){animation-delay:.15s}.otp.good input:nth-child(5){animation-delay:.2s}.otp.good input:nth-child(6){animation-delay:.25s}
@keyframes shake{0%,100%{transform:none}15%{transform:translateX(-12px)}30%{transform:translateX(10px)}45%{transform:translateX(-8px)}60%{transform:translateX(6px)}75%{transform:translateX(-3px)}}
@keyframes pop{50%{transform:scale(1.14)}}
.tick{width:84px;height:84px;margin:20px auto 0;display:none}
.tick.show{display:block}
.tick circle{fill:var(--ok);transform-origin:center;animation:pop .45s both}
.tick path{stroke:#fff;stroke-width:6;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:50;stroke-dashoffset:50;animation:draw .4s .25s forwards}
@keyframes draw{to{stroke-dashoffset:0}}
.mail{position:fixed;left:12px;right:12px;top:calc(12px + env(safe-area-inset-top,0px));max-width:416px;margin:0 auto;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-m);padding:12px 16px;box-shadow:var(--sh-3);transform:translateY(-140%);transition:transform .4s cubic-bezier(.2,.9,.3,1.2);z-index:9}
.mail.show{transform:none}
.mail b{color:var(--brand-d);font:700 26px/1.2 var(--font-display);letter-spacing:.18em}
.mail small{display:block;color:var(--mute)}

/* ============================================================
   APP SHELL
   ============================================================ */
#app{display:flex;flex-direction:column;height:100svh;max-width:640px;margin:0 auto;background:var(--bg)}
.app-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.app-header .brand i{width:30px;height:30px;font-size:19px;border-radius:9px}
.app-header .brand span{font-size:15px}
main{flex:1;overflow-y:auto;padding:22px 20px 110px;scroll-behavior:smooth;scroll-padding-bottom:130px}
#app.focus .app-nav{display:none}
#app.focus main{padding-bottom:48px;scroll-padding-bottom:24px}
#view{animation:viewIn .35s var(--ease)}
@keyframes viewIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.app-nav{position:fixed;left:12px;right:12px;bottom:calc(12px + env(safe-area-inset-bottom,0px));z-index:40;display:flex;gap:4px;padding:6px;max-width:616px;margin:0 auto;
  border-radius:26px;border:1px solid color-mix(in srgb,var(--line) 70%,transparent);background:color-mix(in srgb,var(--card) 82%,transparent);
  backdrop-filter:blur(22px) saturate(180%);-webkit-backdrop-filter:blur(22px) saturate(180%);box-shadow:var(--sh-3)}
.app-nav button{flex:1;min-height:56px;color:var(--mute);font-size:12px;font-weight:700;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:8px 4px;border-radius:20px;transition:color .2s,background .25s var(--ease),transform .12s}
.app-nav button i{font-size:21px;line-height:1}
.app-nav button.on{color:#fff;background:var(--navy)}
.app-nav button.on i{color:var(--brand)}
.app-nav button:active{transform:scale(.96)}
:root[data-theme=dark] .app-nav button.on,:root:not([data-theme=light]) .app-nav button.on{background:var(--brand)}
@media(prefers-color-scheme:light){:root:not([data-theme=dark]) .app-nav button.on{background:var(--navy)}}
:root[data-theme=dark] .app-nav button.on i{color:#fff}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .app-nav button.on i{color:#fff}}
@media(min-width:640px){.app-nav{left:50%;right:auto;transform:translateX(-50%);width:min(616px,calc(100% - 24px))}}

/* ---------- Views ---------- */
.view-title{font-size:38px;margin:2px 0 18px}
.section-h{font-size:15px;font-weight:800;color:var(--ink);margin:30px 0 12px;display:flex;align-items:center;gap:8px}
.section-h .mute{font-weight:500}
.section-h i{color:var(--brand)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);padding:18px;margin-bottom:12px;box-shadow:var(--sh-1)}
.hero-app{position:relative;overflow:hidden;border:0;border-radius:var(--r-xl);padding:24px 22px 22px;color:#fff;box-shadow:var(--sh-3);
  background:var(--curve) right -12px bottom -6px/62% no-repeat,radial-gradient(80% 90% at 100% 0%,rgba(242,107,29,.35),transparent 65%),var(--paper-grid),var(--navy);
  background-size:62%,auto,30px 30px,30px 30px,auto}
.hero-app h2{font:700 32px/1.05 var(--font-display);letter-spacing:0;margin-bottom:8px;position:relative}
.hero-app p{color:rgba(255,255,255,.82);font-size:15px;margin-bottom:20px;position:relative;max-width:30ch}
.hero-app .btn{position:relative;width:auto;display:inline-flex;padding:0 26px}
.tcard{width:100%;text-align:left;display:block;transition:transform .15s var(--ease),border-color .2s,box-shadow .2s}
.tcard:hover{border-color:color-mix(in srgb,var(--brand) 45%,var(--line));box-shadow:var(--sh-2)}
.tcard:active{transform:scale(.985)}
.tcard b{font-size:16px}
.menu-chev{color:var(--mute-2);font-size:16px}
/* progress bars carry the mastery thresholds (40% and 75%) as small cuts */
.bar{position:relative;height:10px;border-radius:99px;background:var(--line-2);overflow:hidden;margin-top:12px}
.bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#F89457,var(--brand));transition:width .7s var(--ease)}
.bar::before,.bar::after{content:"";position:absolute;top:0;bottom:0;width:2px;background:var(--card);z-index:2}
.bar::before{left:40%}.bar::after{left:75%}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:6px}
.stats .card{margin:0;padding:20px}
.stats b,.big{display:block;font:700 40px/1 var(--font-display);color:var(--ink);font-variant-numeric:tabular-nums}
.big{font-size:30px}
.stats p{margin-top:6px;font-size:13px;color:var(--mute)}
.back{display:inline-flex;align-items:center;gap:6px;padding:8px 0;margin-bottom:6px;color:var(--brand-d);font-weight:700;font-size:15px}
details.card summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:8px}
details.card summary::after{content:"";flex:0 0 8px;width:8px;height:8px;margin-left:6px;border-right:2px solid var(--mute);border-bottom:2px solid var(--mute);transform:rotate(45deg);transition:transform .25s var(--ease)}
details.card[open] summary::after{transform:rotate(-135deg)}
summary::-webkit-details-marker{display:none}
.hint{background:var(--brand-tint);border-left:3px solid var(--brand);border-radius:var(--r-s);padding:12px 14px;margin:10px 0;font-size:14px}

/* ---------- Worked example (notebook) ---------- */
.ex{margin-bottom:14px}
.ex-lvl{margin-left:auto;font-size:12px;font-weight:800;padding:3px 10px;border-radius:99px;background:var(--brand-t);color:var(--brand-d)}
.ex-lvl.partial{background:var(--warn-t);color:var(--warn)}
.ex-lvl.solo{background:var(--ok-t);color:var(--ok)}
.ex-prob{margin:14px 0 6px;font-weight:800;font-size:17px}
.ex-steps{margin:0 0 12px;padding:0 0 0 24px;line-height:28px;font-size:15px;background:repeating-linear-gradient(transparent 0 27px,var(--line-2) 27px 28px)}
.ex .btn{min-height:46px;font-size:14.5px}

/* ============================================================
   ACCOUNT, FORMS, SETTINGS
   ============================================================ */
.account-hero{position:relative;overflow:hidden;border-radius:var(--r-xl);padding:24px 20px;margin-bottom:20px;color:#fff;box-shadow:var(--sh-3);
  background:radial-gradient(70% 100% at 100% 0%,rgba(242,107,29,.4),transparent 65%),var(--paper-grid),var(--navy);background-size:auto,30px 30px,30px 30px,auto}
.account-hero-inner{position:relative;display:flex;align-items:center;gap:16px}
.account-avatar{position:relative;width:76px;height:76px;flex:0 0 76px;border-radius:50%;overflow:hidden;cursor:pointer;display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg,var(--brand),#FF9A5C);box-shadow:0 0 0 3px rgba(255,255,255,.9),0 10px 24px -6px rgba(0,0,0,.5);transition:transform .15s}
.account-avatar:active{transform:scale(.96)}
.account-avatar img{width:100%;height:100%;object-fit:cover}
.edit-badge{position:absolute;inset:auto 0 0 0;height:24px;display:grid;place-items:center;font-size:11px;font-weight:700;color:#fff;background:rgba(10,20,40,.62);backdrop-filter:blur(4px)}
.account-name{font:700 28px/1.05 var(--font-display);margin-bottom:3px}
.account-email{font-size:13.5px;color:rgba(255,255,255,.7);word-break:break-all}
.account-badge{display:inline-flex;align-items:center;gap:6px;margin-top:10px;padding:4px 12px;border-radius:99px;font-size:12.5px;font-weight:700;color:#FFD2B3;background:rgba(242,107,29,.22);border:1px solid rgba(242,107,29,.4)}
.menu-group{background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);overflow:hidden;margin-bottom:6px;box-shadow:var(--sh-1)}
.menu-item,.setting-row{width:100%;display:flex;align-items:center;gap:14px;padding:14px 16px;border-bottom:1px solid var(--line-2);text-align:left;background:transparent;font-weight:600;color:var(--ink)}
.menu-item{transition:background .15s}
.menu-item:last-child,.setting-row:last-child{border-bottom:0}
.menu-item:hover{background:var(--brand-tint)}
.menu-ico{width:38px;height:38px;flex:0 0 38px;border-radius:11px;display:grid;place-items:center;font-size:18px;background:var(--brand-t);color:var(--brand-d)}
.setting-row.toggle .menu-ico{background:var(--warn-t);color:var(--warn)}
.menu-body{flex:1;min-width:0}
.menu-title{font-weight:700;font-size:15px}
.menu-sub{font-size:13px;color:var(--mute);font-weight:500;margin-top:1px}
.menu-item.danger .menu-ico{background:var(--bad-t);color:var(--bad)}
.menu-item.danger .menu-title{color:var(--bad)}
.form-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);padding:20px;margin-bottom:14px;box-shadow:var(--sh-1)}
.form-section-title{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:800;margin-bottom:16px}
.form-section-title i{color:var(--brand)}
.form-field{margin-bottom:16px}
.form-field:last-child{margin-bottom:0}
.form-field label{display:block;font-size:14px;font-weight:700;margin-bottom:7px}
.form-field .help{display:block;font-size:12.5px;color:var(--mute);margin-top:6px}
.input-wrap{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:var(--r-m);background:var(--card);overflow:hidden;transition:border-color .2s,box-shadow .2s}
.input-wrap:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-t)}
.input-wrap>i{flex:0 0 48px;display:grid;place-items:center;color:var(--mute-2);font-size:17px;pointer-events:none}
.input-wrap input,.input-wrap select,.input-wrap textarea{flex:1;width:100%;min-height:52px;padding:0 16px 0 0;margin:0;border:0;border-radius:0;background:transparent;color:var(--ink);font:inherit;font-size:15px;outline:0;appearance:none;-webkit-appearance:none}
.input-wrap textarea{min-height:84px;padding:15px 16px 15px 0;resize:vertical}
.input-wrap select{padding-right:42px;cursor:pointer;background:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23667590' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") right 16px center/14px no-repeat}
.input-wrap:has(input[readonly]){background:var(--bg-2);border-color:var(--line-2)}
.input-wrap:has(input[readonly]) input{color:var(--mute)}
.save-bar{padding-top:6px}
.save-status{text-align:center;font-size:13.5px;font-weight:600;margin-top:10px;min-height:20px}
.save-status.ok{color:var(--ok)}.save-status.err{color:var(--bad)}
.seg{display:flex;gap:4px;padding:4px;border-radius:var(--r-m);background:var(--bg-2)}
.seg button{flex:1;min-height:44px;display:flex;align-items:center;justify-content:center;gap:6px;border-radius:12px;font-weight:700;font-size:14px;color:var(--mute);transition:background .2s,color .2s,box-shadow .2s}
.seg button.on{background:var(--card);color:var(--brand-d);box-shadow:var(--sh-1)}
.switch{position:relative;display:inline-block;width:52px;height:32px;flex:0 0 52px}
.switch input{opacity:0;width:0;height:0;position:absolute}
.switch span{position:absolute;inset:0;border-radius:99px;background:var(--line);cursor:pointer;transition:background .2s}
.switch span::before{content:"";position:absolute;left:3px;top:3px;width:26px;height:26px;border-radius:50%;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.25);transition:transform .25s var(--ease)}
.switch input:checked+span{background:var(--brand)}
.switch input:checked+span::before{transform:translateX(20px)}
.switch input:focus-visible+span{outline:3px solid var(--brand);outline-offset:2px}
.privacy-card{display:flex;gap:14px;align-items:flex-start;padding:18px;margin-bottom:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);box-shadow:var(--sh-1)}
.privacy-icon{width:42px;height:42px;flex:0 0 42px;border-radius:12px;display:grid;place-items:center;font-size:19px;background:var(--brand-t);color:var(--brand-d)}
.privacy-icon.ok{background:var(--ok-t);color:var(--ok)}
.privacy-icon.warn{background:var(--warn-t);color:var(--warn)}
.privacy-icon.info{background:#DCE8FF;color:#1D4ED8}
:root[data-theme=dark] .privacy-icon.info{background:#16284F;color:#9CC0FF}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .privacy-icon.info{background:#16284F;color:#9CC0FF}}
.privacy-body b{display:block;font-size:15px;margin-bottom:4px}
.privacy-body p{font-size:14px;color:var(--mute);line-height:1.6}
.hl-chip{display:inline-flex;align-items:center;padding:7px 13px;margin:0 6px 6px 0;border-radius:99px;font-size:13.5px;font-weight:700;background:var(--brand-t);color:var(--brand-d)}
.hl-chip.me{background:var(--navy);color:#fff}

/* ============================================================
   PRACTICE + DIAGNOSTIC
   ============================================================ */
.q-header{display:flex;align-items:center;gap:12px;margin-bottom:22px}
.link-quit{width:42px;height:42px;flex:0 0 42px;border-radius:50%;display:grid;place-items:center;font-size:18px;color:var(--mute);background:var(--bg-2);transition:background .2s,color .2s,transform .1s}
.link-quit:hover{background:var(--brand-t);color:var(--brand-d)}
.link-quit:active{transform:scale(.94)}
#say{background:var(--brand-t);color:var(--brand-d)}
.q-progress{flex:1;height:10px;border-radius:99px;background:var(--line-2);overflow:hidden}
.q-progress>div{height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,#F89457,var(--brand));transition:width .5s var(--ease)}
.q-counter{font-size:13.5px;font-weight:800;color:var(--mute);font-variant-numeric:tabular-nums}
.q-objective{font-size:14px;font-weight:700;color:var(--brand-d);margin-bottom:8px}
.q-text{font-size:clamp(24px,6.6vw,30px);font-weight:800;line-height:1.22;margin-bottom:22px}
.conf{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:0 0 16px;font-size:14px;font-weight:600;color:var(--mute)}
.conf>span{grid-column:1/-1}
.conf-chip{padding:11px 8px;border-radius:99px;border:1.5px solid var(--line);background:var(--card);font-size:14px;font-weight:700;color:var(--ink-2);transition:border-color .15s,background .15s,color .15s}
.conf-chip.on{border-color:var(--brand);background:var(--brand-t);color:var(--brand-d)}
.q-options{display:grid;gap:10px}
.q-opt{display:flex;align-items:center;gap:14px;width:100%;padding:15px 16px;text-align:left;border:1.5px solid var(--line);border-radius:var(--r-m);background:var(--card);
  color:var(--ink);font-size:17px;font-weight:700;box-shadow:var(--sh-1);transition:border-color .15s,background .15s,transform .12s,box-shadow .2s}
.q-opt:hover:not(:disabled){border-color:var(--brand);box-shadow:0 6px 16px -8px rgba(242,107,29,.5)}
.q-opt:active:not(:disabled){transform:scale(.985)}
.q-opt:disabled{cursor:default}
.q-opt-key{width:34px;height:34px;flex:0 0 34px;border-radius:10px;display:grid;place-items:center;font:700 19px/1 var(--font-display);background:var(--bg-2);color:var(--ink-2);transition:background .15s,color .15s}
.q-opt-text{flex:1}
.q-opt.correct{border-color:var(--ok);background:var(--ok-t);animation:pop .35s var(--ease)}
.q-opt.correct .q-opt-key{background:var(--ok);color:#fff}
.q-opt.wrong{border-color:var(--bad);background:var(--bad-t);animation:shake .45s}
.q-opt.wrong .q-opt-key{background:var(--bad);color:#fff}
.q-input-wrap{display:flex;flex-direction:column;gap:12px}
.q-input{width:100%;min-height:62px;padding:14px 20px;text-align:center;border:1.5px solid var(--line);border-radius:var(--r-m);background:var(--card);color:var(--ink);font:700 22px var(--font-body);transition:border-color .2s,box-shadow .2s}
.q-input:focus{border-color:var(--brand);outline:0;box-shadow:0 0 0 4px var(--brand-t)}
.q-input.wrong{border-color:var(--bad);background:var(--bad-t);color:var(--bad);animation:shake .45s}
.q-feedback-wrap{display:grid;gap:10px;margin-top:18px}
.q-feedback{display:flex;gap:14px;align-items:flex-start;padding:16px;border-radius:var(--r-m);animation:rise .35s var(--ease) both}
.q-feedback.correct{background:var(--ok-t)}.q-feedback.wrong{background:var(--bad-t)}.q-feedback.neutral{background:var(--brand-t)}
.q-feedback-icon{width:36px;height:36px;flex:0 0 36px;border-radius:50%;display:grid;place-items:center;font-size:19px;color:#fff}
.q-feedback.correct .q-feedback-icon{background:var(--ok)}
.q-feedback.wrong .q-feedback-icon{background:var(--bad)}
.q-feedback.neutral .q-feedback-icon{background:var(--brand)}
.q-feedback-body{flex:1;min-width:0}
.q-feedback-body strong{display:block;font-size:16px;margin-bottom:3px}
.q-feedback.correct strong{color:var(--ok)}.q-feedback.wrong strong{color:var(--bad)}.q-feedback.neutral strong{color:var(--brand-d)}
.q-feedback-body p{font-size:14.5px;color:var(--ink-2)}
.q-hint{padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:var(--r-m);background:var(--card);animation:rise .3s var(--ease) both}
.q-hint.ai{border-left-color:#7C5CF0;background:color-mix(in srgb,#7C5CF0 7%,var(--card))}
.q-hint.fallback{border-left-color:var(--mute-2);background:var(--bg-2)}
.q-hint-label{display:flex;align-items:center;gap:6px;font-size:13.5px;font-weight:800;color:var(--brand-d);margin-bottom:5px}
.q-hint.ai .q-hint-label{color:#6A48E0}
:root[data-theme=dark] .q-hint.ai .q-hint-label{color:#B9A4FF}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .q-hint.ai .q-hint-label{color:#B9A4FF}}
.q-hint.fallback .q-hint-label{color:var(--mute)}
.q-hint p{font-size:15px}
.q-ai{display:flex;align-items:center;gap:10px;width:100%;padding:14px 18px;border-radius:var(--r-m);background:linear-gradient(135deg,#7C5CF0,#5B3CD0);color:#fff;font-weight:700;font-size:15px;box-shadow:0 10px 22px -10px rgba(91,60,208,.7);animation:rise .4s var(--ease) both;transition:transform .12s}
.q-ai:active{transform:scale(.985)}
.q-ai i{font-size:18px}
.q-ai-loading{display:flex;align-items:center;gap:10px;padding:14px 18px;border-radius:var(--r-m);background:var(--bg-2);font-size:14px;font-weight:600;color:var(--mute)}
.spinner-dot{width:16px;height:16px;border:2px solid var(--line);border-top-color:#7C5CF0;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.q-actions{margin-top:20px}
.no-tts #say{display:none}

/* ---------- Session complete ---------- */
.complete-wrap{text-align:center;padding:10px 0 24px;animation:rise .5s var(--ease) both}
.complete-ring{position:relative;width:170px;height:170px;margin:6px auto 22px}
.complete-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.complete-track{fill:none;stroke:var(--line-2);stroke-width:6}
.complete-fill{fill:none;stroke:var(--brand);stroke-width:6;stroke-linecap:round;transition:stroke-dasharray 1s var(--ease)}
.complete-fill.up{stroke:var(--ok)}.complete-fill.down{stroke:var(--bad)}
.complete-pct{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.delta-value{font:700 46px/1 var(--font-display);font-variant-numeric:tabular-nums}
.complete-pct small{font-size:13px;font-weight:600;color:var(--mute);margin-top:2px}
.complete-pct.up .delta-value{color:var(--ok)}.complete-pct.down .delta-value{color:var(--bad)}.complete-pct.flat .delta-value{color:var(--brand-d)}
.delta-chip{display:inline-flex;align-items:center;margin-left:8px;padding:3px 10px;border-radius:99px;font-size:12.5px;font-weight:800;vertical-align:middle}
.delta-chip.up{background:var(--ok-t);color:var(--ok)}.delta-chip.down{background:var(--bad-t);color:var(--bad)}.delta-chip.flat{background:var(--brand-t);color:var(--brand-d)}
.complete-icon{width:96px;height:96px;margin:10px auto 20px;border-radius:50%;display:grid;place-items:center;font-size:44px;color:#fff;background:var(--navy);box-shadow:0 0 0 6px var(--brand-t),var(--sh-3);animation:pop .5s var(--ease) both}
.complete-title{font-size:40px;margin-bottom:6px}
.complete-sub{color:var(--mute);margin-bottom:22px}
.complete-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:20px}
.complete-stats .card{margin:0;padding:20px}
.complete-stats b{display:block;font:700 40px/1 var(--font-display);color:var(--ink)}
.complete-stats p{margin-top:6px;font-size:13px;color:var(--mute)}
.complete-mastery{color:var(--ink-2);margin-bottom:24px}
.complete-mastery b{color:var(--brand-d)}
.diag-result{margin-bottom:8px;text-align:left}
.diag-badge{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:99px;font-size:12.5px;font-weight:800}
.diag-badge.ok{background:var(--ok-t);color:var(--ok)}.diag-badge.warn{background:var(--warn-t);color:var(--warn)}

/* ============================================================
   RESPONSIVE + MOTION
   ============================================================ */
@media(min-width:640px){
  .section,.hero{padding-left:32px;padding-right:32px}
  .features{grid-template-columns:repeat(3,1fr)}
  .view-title{font-size:44px}
}
@media(min-width:900px){
  .hero-title{font-size:clamp(100px,11vw,150px)}
  .section-title{font-size:clamp(68px,7vw,92px)}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .hero-title .line,.reveal{opacity:1;transform:none}
}


/* ============================================================
   Toast — small informational messages
   ============================================================ */
.toast{
  position:fixed;
  left:50%;
  bottom:calc(90px + env(safe-area-inset-bottom,0px));
  transform:translateX(-50%) translateY(20px);
  background:var(--ink);
  color:#fff;
  padding:12px 20px;
  border-radius:999px;
  font-size:14px;
  font-weight:600;
  box-shadow:0 12px 40px rgba(0,0,0,.25);
  max-width:90vw;
  text-align:center;
  z-index:200;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s, transform .25s cubic-bezier(.16,1,.3,1);
}
.toast.show{
  opacity:1;
  transform:translateX(-50%) translateY(0);
}

/* Highlight chip — "me" state is visually distinct */
.hl-chip.me{
  background:var(--brand);
  color:#fff;
  border-color:var(--brand);
}