/* ==========================================================================
   Florida Business & Finance Exam Simulator — design system
   Navy / gold / construction-business identity. Light + dark.
   ========================================================================== */

:root {
  /* brand */
  --navy-900:#0a1a33; --navy-800:#0f2547; --navy-700:#143059; --navy-600:#1b3d70;
  --navy-500:#24508d; --navy-300:#7d99c4; --navy-100:#dbe4f2;
  --gold-600:#b8860b; --gold-500:#d4a017; --gold-400:#e8b93c; --gold-100:#fdf3d8;
  --green-700:#146c43; --green-600:#198754; --green-500:#28a745; --green-100:#d7f0e0;
  --red-700:#a4232b; --red-600:#c62b34; --red-500:#dc3545; --red-100:#fbdcde;
  --amber-600:#b8720b; --amber-100:#fdeccd;
  --blue-600:#1c6ea4; --blue-100:#d9ecf7;

  /* surfaces (light) */
  --bg:#f4f6fa; --surface:#ffffff; --surface-2:#f8fafc; --surface-3:#eef2f8;
  --border:#dbe1ea; --border-strong:#c3ccd9;
  --text:#16233a; --text-2:#4c5a72; --text-3:#7c8798;
  --header-bg:var(--navy-800); --header-text:#ffffff;
  --accent:var(--navy-600); --accent-text:#ffffff;
  --shadow-sm:0 1px 2px rgba(10,26,51,.06),0 1px 3px rgba(10,26,51,.08);
  --shadow-md:0 2px 6px rgba(10,26,51,.07),0 6px 18px rgba(10,26,51,.09);
  --shadow-lg:0 10px 40px rgba(10,26,51,.18);
  --radius:12px; --radius-sm:8px; --radius-lg:18px;
  --focus:0 0 0 3px rgba(36,80,141,.35);
  --maxw:1180px;
  --font:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  /* combined height of the sticky topbar + nav, used to park the exam bar
     underneath them instead of covering them */
  --chrome-h:97px;
}

html[data-theme="dark"] {
  --bg:#0b1220; --surface:#131c2e; --surface-2:#182338; --surface-3:#1f2c45;
  --border:#28374f; --border-strong:#3a4c69;
  --text:#e7ecf5; --text-2:#a9b6cb; --text-3:#7e8da5;
  --header-bg:#0a1424; --header-text:#f2f6fc;
  --accent:#3a6db5; --accent-text:#ffffff;
  --navy-100:#1c2a44; --gold-100:#3a2f10; --green-100:#123024; --red-100:#3a161a;
  --amber-100:#38290f; --blue-100:#122b3d;
  --green-600:#3ac07b; --green-700:#2fa568; --red-600:#f2666f; --red-700:#e04a54;
  --gold-500:#e8b93c; --gold-600:#d4a017;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4); --shadow-md:0 4px 16px rgba(0,0,0,.45);
  --shadow-lg:0 12px 44px rgba(0,0,0,.6);
  --focus:0 0 0 3px rgba(120,166,232,.45);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--text);font-family:var(--font);
  font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;
  overscroll-behavior-y:none;
}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.25;font-weight:700;letter-spacing:-.01em}
h1{font-size:1.6rem} h2{font-size:1.3rem} h3{font-size:1.08rem} h4{font-size:.95rem}
p{margin:0 0 1em}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:none;box-shadow:var(--focus);border-radius:6px}
img{max-width:100%}
[hidden]{display:none !important}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:-9999px;top:0;z-index:200;background:var(--gold-500);
  color:#000;padding:10px 16px;font-weight:700;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* ---------- app frame ---------- */
.app{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}

.topbar{
  background:var(--header-bg);color:var(--header-text);position:sticky;top:0;z-index:60;
  box-shadow:0 1px 0 rgba(255,255,255,.06),0 2px 14px rgba(0,0,0,.22);
  padding-top:env(safe-area-inset-top);
}
.topbar-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:10px;
  padding:10px 14px;min-height:58px}
.brand{display:flex;align-items:center;gap:10px;color:inherit;font-weight:800;letter-spacing:-.02em;
  text-decoration:none;flex:1;min-width:0}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;flex:0 0 34px;border-radius:9px;
  background:linear-gradient(145deg,var(--gold-400),var(--gold-600));
  display:grid;place-items:center;color:var(--navy-900);font-size:16px;font-weight:900;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.18)}
.brand-txt{display:flex;flex-direction:column;min-width:0}
.brand-txt b{font-size:.98rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-txt span{font-size:.68rem;color:var(--navy-300);font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;white-space:nowrap}
.brand-short{display:none}
.topbar-actions{display:flex;align-items:center;gap:6px}

.iconbtn{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:inherit;
  width:38px;height:38px;border-radius:10px;display:grid;place-items:center;cursor:pointer;
  font-size:15px;font-weight:700;transition:background .15s,transform .1s;padding:0}
.iconbtn:hover{background:rgba(255,255,255,.18)}
.iconbtn:active{transform:scale(.94)}
.iconbtn.on{background:var(--gold-500);border-color:var(--gold-500);color:var(--navy-900)}
.lang-toggle{width:auto;padding:0 12px;font-size:.78rem;letter-spacing:.04em}

/* nav */
.nav{background:var(--navy-700);position:sticky;top:58px;z-index:55;overflow-x:auto;
  -webkit-overflow-scrolling:touch;scrollbar-width:none}
html[data-theme="dark"] .nav{background:#101a2c}
.nav::-webkit-scrollbar{display:none}
.nav-inner{max-width:var(--maxw);margin:0 auto;display:flex;gap:2px;padding:0 8px}
.nav a{color:#c7d5ec;padding:11px 13px;font-size:.855rem;font-weight:600;white-space:nowrap;
  border-bottom:3px solid transparent;text-decoration:none;transition:color .15s}
.nav a:hover{color:#fff;text-decoration:none}
.nav a.active{color:#fff;border-bottom-color:var(--gold-500)}
.nav a.admin-link{color:var(--gold-400)}
.nav a.only-sm{display:none}
@media (max-width:700px){ .nav a.only-sm{display:block} }

main{flex:1;width:100%;max-width:var(--maxw);margin:0 auto;padding:20px 14px 90px}
.footer{border-top:1px solid var(--border);background:var(--surface);color:var(--text-3);
  font-size:.78rem;padding:18px 14px calc(18px + env(safe-area-inset-bottom))}
.footer-inner{max-width:var(--maxw);margin:0 auto;display:flex;flex-wrap:wrap;gap:6px 18px;
  align-items:center;justify-content:space-between}

/* ---------- cards ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:18px;margin-bottom:16px}
.card.pad-sm{padding:14px}
.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;
  margin-bottom:14px;flex-wrap:wrap}
.card-head h2,.card-head h3{margin:0}
.card-sub{color:var(--text-2);font-size:.86rem;margin:2px 0 0}

.grid{display:grid;gap:14px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(215px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(165px,1fr))}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:inherit;font-size:.92rem;font-weight:650;line-height:1.2;
  padding:11px 18px;min-height:44px;border-radius:10px;border:1px solid transparent;
  background:var(--accent);color:var(--accent-text);cursor:pointer;text-decoration:none;
  transition:filter .15s,transform .08s,box-shadow .15s;box-shadow:var(--shadow-sm);
  -webkit-tap-highlight-color:transparent}
.btn:hover{filter:brightness(1.08);text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;filter:none}
.btn-gold{background:linear-gradient(160deg,var(--gold-400),var(--gold-600));color:#2a1f00;
  border-color:var(--gold-600)}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--border-strong)}
.btn-ghost:hover{background:var(--surface-3);filter:none}
.btn-quiet{background:transparent;color:var(--text-2);border-color:transparent;box-shadow:none}
.btn-quiet:hover{background:var(--surface-3);filter:none}
.btn-green{background:var(--green-600);border-color:var(--green-700)}
.btn-red{background:var(--red-600);border-color:var(--red-700)}
.btn-sm{padding:7px 12px;min-height:36px;font-size:.83rem;border-radius:8px}
.btn-lg{padding:14px 24px;min-height:52px;font-size:1rem}
.btn-block{width:100%}
.btn-row{display:flex;flex-wrap:wrap;gap:10px}

/* ---------- forms ---------- */
label{display:block;font-size:.83rem;font-weight:650;color:var(--text-2);margin-bottom:5px}
input[type=text],input[type=number],input[type=email],input[type=password],input[type=search],
input[type=date],select,textarea{
  width:100%;font-family:inherit;font-size:.95rem;color:var(--text);background:var(--surface);
  border:1px solid var(--border-strong);border-radius:9px;padding:10px 12px;min-height:44px;
  transition:border-color .15s,box-shadow .15s}
textarea{min-height:90px;resize:vertical;line-height:1.5}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--text-3) 50%),
  linear-gradient(135deg,var(--text-3) 50%,transparent 50%);
  background-position:calc(100% - 17px) 50%,calc(100% - 12px) 50%;
  background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:34px}
input:focus,select:focus,textarea:focus{border-color:var(--accent);outline:none;box-shadow:var(--focus)}
.field{margin-bottom:14px}
.field-hint{font-size:.76rem;color:var(--text-3);margin-top:4px}
.check{display:flex;align-items:flex-start;gap:9px;margin-bottom:9px;cursor:pointer;
  font-size:.9rem;font-weight:500;color:var(--text)}
.check input{width:19px;height:19px;min-height:0;flex:0 0 19px;margin-top:2px;accent-color:var(--accent);cursor:pointer}
.chipset{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:7px 13px;border-radius:999px;
  border:1px solid var(--border-strong);background:var(--surface);color:var(--text-2);
  font-size:.82rem;font-weight:600;cursor:pointer;user-select:none;min-height:36px;
  transition:all .15s}
.chip:hover{border-color:var(--accent)}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff}
.chip.on.gold{background:var(--gold-500);border-color:var(--gold-600);color:#2a1f00}

/* ---------- badges & pills ---------- */
.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 9px;border-radius:999px;
  font-size:.71rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;
  background:var(--surface-3);color:var(--text-2);border:1px solid var(--border);white-space:nowrap}
.badge.easy{background:var(--green-100);color:var(--green-700);border-color:transparent}
.badge.medium{background:var(--amber-100);color:var(--amber-600);border-color:transparent}
.badge.hard{background:var(--red-100);color:var(--red-700);border-color:transparent}
.badge.gold{background:var(--gold-100);color:var(--gold-600);border-color:transparent}
.badge.navy{background:var(--navy-100);color:var(--navy-600);border-color:transparent}
.badge.blue{background:var(--blue-100);color:var(--blue-600);border-color:transparent}
.badge.ok{background:var(--green-100);color:var(--green-700);border-color:transparent}
.badge.bad{background:var(--red-100);color:var(--red-700);border-color:transparent}
html[data-theme="dark"] .badge.medium{color:var(--gold-400)}

/* ---------- stats ---------- */
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:15px;box-shadow:var(--shadow-sm)}
.stat-label{font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--text-3);margin-bottom:6px;display:block}
.stat-value{font-size:1.75rem;font-weight:800;line-height:1.05;letter-spacing:-.02em;
  font-variant-numeric:tabular-nums}
.stat-value small{font-size:.85rem;font-weight:600;color:var(--text-3);margin-left:2px}
.stat-note{font-size:.76rem;color:var(--text-3);margin-top:5px}
.stat.accent{border-left:4px solid var(--gold-500)}
.stat.good .stat-value{color:var(--green-600)}
.stat.bad .stat-value{color:var(--red-600)}

/* ---------- progress ---------- */
.bar{height:9px;border-radius:999px;background:var(--surface-3);overflow:hidden;
  border:1px solid var(--border)}
.bar > i{display:block;height:100%;background:var(--accent);border-radius:999px;
  transition:width .5s cubic-bezier(.4,0,.2,1)}
.bar.thin{height:6px}
.bar.tall{height:13px}
.bar > i.good{background:linear-gradient(90deg,var(--green-500),var(--green-600))}
.bar > i.mid{background:linear-gradient(90deg,var(--gold-400),var(--gold-600))}
.bar > i.low{background:linear-gradient(90deg,var(--red-500),var(--red-600))}
.bar-row{display:flex;align-items:center;gap:12px;margin-bottom:11px}
.bar-row .bar-label{flex:1;min-width:0;font-size:.86rem;font-weight:600;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bar-row .bar{flex:0 0 40%;max-width:220px}
.bar-row .bar-num{flex:0 0 78px;text-align:right;font-size:.8rem;color:var(--text-2);
  font-variant-numeric:tabular-nums}

.ring{--pct:0;--ring-color:var(--accent);width:118px;height:118px;border-radius:50%;
  display:grid;place-items:center;flex:0 0 118px;
  background:conic-gradient(var(--ring-color) calc(var(--pct)*1%),var(--surface-3) 0);
  position:relative}
.ring::after{content:"";position:absolute;inset:11px;border-radius:50%;background:var(--surface)}
.ring > span{position:relative;z-index:1;text-align:center;line-height:1.1}
.ring b{display:block;font-size:1.6rem;font-weight:800;font-variant-numeric:tabular-nums}
.ring small{font-size:.68rem;color:var(--text-3);font-weight:700;letter-spacing:.06em;
  text-transform:uppercase}

/* ---------- dashboard tiles ---------- */
.tiles{display:grid;gap:13px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.tile{position:relative;display:flex;flex-direction:column;gap:6px;text-align:left;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:17px;cursor:pointer;font-family:inherit;color:var(--text);
  box-shadow:var(--shadow-sm);transition:transform .14s,box-shadow .14s,border-color .14s;
  overflow:hidden;min-height:112px;width:100%}
.tile::before{content:"";position:absolute;inset:0 auto 0 0;width:4px;background:var(--accent)}
.tile:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--border-strong);
  text-decoration:none}
.tile-icon{font-size:1.35rem;line-height:1}
.tile b{font-size:1rem;font-weight:750}
.tile span{font-size:.81rem;color:var(--text-2);line-height:1.4}
.tile.primary{background:linear-gradient(150deg,var(--navy-700),var(--navy-800));color:#fff;
  border-color:var(--navy-800)}
.tile.primary::before{background:var(--gold-500)}
.tile.primary span{color:#c3d2e8}
.tile.gold::before{background:var(--gold-500)}
.tile.green::before{background:var(--green-600)}
.tile.red::before{background:var(--red-600)}
.tile.blue::before{background:var(--blue-600)}
.tile-tag{position:absolute;top:11px;right:11px}

/* ---------- question rendering ---------- */
.qcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:20px;margin-bottom:16px}
.qmeta{display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin-bottom:14px;
  padding-bottom:12px;border-bottom:1px solid var(--border)}
.qnum{font-size:.8rem;font-weight:800;color:var(--text-3);letter-spacing:.04em;margin-right:auto}
.scenario{background:var(--navy-100);border-left:4px solid var(--navy-500);border-radius:0 9px 9px 0;
  padding:12px 15px;margin-bottom:15px;font-size:.89rem;color:var(--text-2);line-height:1.55}
html[data-theme="dark"] .scenario{background:var(--surface-2)}
.scenario b{color:var(--text);display:block;margin-bottom:4px;font-size:.76rem;
  text-transform:uppercase;letter-spacing:.06em}
.qstem{font-size:1.06rem;line-height:1.6;font-weight:600;margin-bottom:18px;color:var(--text)}

.opts{display:flex;flex-direction:column;gap:9px;margin-bottom:6px}
.opt{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;
  background:var(--surface);border:2px solid var(--border);border-radius:11px;
  padding:13px 15px;cursor:pointer;font-family:inherit;font-size:.95rem;line-height:1.5;
  color:var(--text);transition:all .13s;-webkit-tap-highlight-color:transparent;min-height:52px}
.opt:hover:not(:disabled){border-color:var(--accent);background:var(--surface-2)}
.opt:disabled{cursor:default}
.opt-letter{flex:0 0 30px;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;
  background:var(--surface-3);color:var(--text-2);font-weight:800;font-size:.87rem;
  border:1px solid var(--border)}
.opt-text{flex:1;padding-top:3px}
.opt-mark{flex:0 0 auto;font-size:1.05rem;font-weight:800;padding-top:2px}
.opt.selected{border-color:var(--accent);background:var(--navy-100)}
html[data-theme="dark"] .opt.selected{background:var(--surface-2)}
.opt.selected .opt-letter{background:var(--accent);color:#fff;border-color:var(--accent)}
.opt.correct{border-color:var(--green-600);background:var(--green-100)}
.opt.correct .opt-letter{background:var(--green-600);color:#fff;border-color:var(--green-600)}
.opt.correct .opt-mark{color:var(--green-700)}
.opt.wrong{border-color:var(--red-600);background:var(--red-100)}
.opt.wrong .opt-letter{background:var(--red-600);color:#fff;border-color:var(--red-600)}
.opt.wrong .opt-mark{color:var(--red-700)}

/* feedback panel */
.feedback{margin-top:18px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);
  animation:slideIn .22s ease-out}
@keyframes slideIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}
.feedback-head{padding:12px 16px;font-weight:800;font-size:1rem;display:flex;align-items:center;
  gap:10px;color:#fff}
.feedback-head.ok{background:var(--green-600)}
.feedback-head.bad{background:var(--red-600)}
.feedback-body{padding:16px;background:var(--surface-2)}
.expl-block{margin-bottom:14px}
.expl-label{font-size:.71rem;font-weight:800;letter-spacing:.07em;text-transform:uppercase;
  color:var(--text-3);margin-bottom:5px;display:flex;align-items:center;gap:7px}
.expl-text{font-size:.94rem;line-height:1.62}
.work-box{font-family:var(--mono);font-size:.84rem;white-space:pre-wrap;background:var(--surface-3);
  border-left:3px solid var(--gold-500);border-radius:0 8px 8px 0;padding:11px 13px;
  margin-top:8px;line-height:1.6;overflow-x:auto}
.ref-box{background:var(--navy-100);border-radius:9px;padding:13px 15px;margin-bottom:14px;
  font-size:.88rem}
html[data-theme="dark"] .ref-box{background:var(--surface-3)}
.ref-box .ref-title{font-weight:750;color:var(--text);display:flex;align-items:center;gap:7px;
  margin-bottom:7px}
.ref-line{display:flex;gap:8px;margin-bottom:3px;color:var(--text-2);flex-wrap:wrap}
.ref-line b{color:var(--text);font-weight:650;flex:0 0 auto;min-width:84px}
.review-note{background:var(--amber-100);border-left:4px solid var(--amber-600);
  border-radius:0 8px 8px 0;padding:11px 14px;font-size:.85rem;color:var(--text-2);margin-bottom:14px}
.review-note b{color:var(--amber-600)}

.confidence{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px;
  padding-top:13px;border-top:1px solid var(--border)}
.confidence > span{font-size:.79rem;font-weight:700;color:var(--text-2);margin-right:2px}

/* ---------- exam ---------- */
.exam-bar{position:sticky;top:var(--chrome-h);z-index:50;background:var(--navy-800);color:#fff;
  padding:9px 14px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  border-radius:10px;box-shadow:var(--shadow-md);margin-bottom:14px}
body.fullscreen-exam .exam-bar{top:0;z-index:70;border-radius:0;margin:0 -14px 14px;
  padding-top:calc(9px + env(safe-area-inset-top))}
.exam-bar .ebl{font-size:.82rem;font-weight:600;color:#b9c9e2}
.timer{font-family:var(--mono);font-size:1.15rem;font-weight:800;padding:5px 13px;border-radius:9px;
  background:rgba(255,255,255,.12);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.timer.warn{background:var(--amber-600);animation:pulse 1.6s ease-in-out infinite}
.timer.danger{background:var(--red-600);animation:pulse .9s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.62}}
.exam-progress{flex:1 1 140px;min-width:110px}
.navigator{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:7px}
.navbtn{aspect-ratio:1;min-height:44px;border-radius:9px;border:2px solid var(--border);
  background:var(--surface);color:var(--text-2);font-weight:750;font-size:.85rem;cursor:pointer;
  font-family:inherit;display:grid;place-items:center;position:relative;transition:all .12s}
.navbtn:hover{border-color:var(--accent)}
.navbtn.answered{background:var(--navy-600);border-color:var(--navy-600);color:#fff}
.navbtn.flagged{border-color:var(--gold-500);border-width:3px}
.navbtn.flagged::after{content:"";position:absolute;top:2px;right:2px;width:7px;height:7px;
  border-radius:50%;background:var(--gold-500)}
.navbtn.current{outline:3px solid var(--gold-500);outline-offset:1px}
.navbtn.correct{background:var(--green-600);border-color:var(--green-600);color:#fff}
.navbtn.wrong{background:var(--red-600);border-color:var(--red-600);color:#fff}
.navbtn.skipped{background:var(--surface-3)}
.nav-legend{display:flex;flex-wrap:wrap;gap:12px;font-size:.76rem;color:var(--text-2);margin-top:12px}
.nav-legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:5px;
  vertical-align:-1px;border:1px solid var(--border)}

body.fullscreen-exam .topbar,body.fullscreen-exam .nav,body.fullscreen-exam .footer{display:none}
body.fullscreen-exam main{padding-top:0;max-width:940px}

/* ---------- flashcards ---------- */
.flash-wrap{perspective:1600px;margin-bottom:16px}
.flash{position:relative;min-height:330px;transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.4,.1,.2,1);cursor:pointer}
.flash.flipped{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);padding:24px;display:flex;flex-direction:column;overflow-y:auto}
.flash-back{transform:rotateY(180deg);background:var(--surface-2)}
.flash-face .flash-hint{margin-top:auto;padding-top:14px;font-size:.78rem;color:var(--text-3);
  text-align:center;font-weight:600}
.flash-answer{background:var(--green-100);border-radius:10px;padding:13px 15px;margin-bottom:14px;
  font-weight:650;color:var(--green-700);font-size:.97rem}
html[data-theme="dark"] .flash-answer{color:var(--green-600)}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--border);
  border-radius:var(--radius);background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:.87rem;min-width:560px}
th,td{padding:10px 13px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--surface-3);font-weight:750;font-size:.75rem;letter-spacing:.05em;
  text-transform:uppercase;color:var(--text-2);position:sticky;top:0;z-index:1;white-space:nowrap}
tbody tr:hover{background:var(--surface-2)}
tbody tr:last-child td{border-bottom:none}
td.num{text-align:right;font-variant-numeric:tabular-nums}
.table-actions{display:flex;gap:5px;flex-wrap:wrap}

/* ---------- modal ---------- */
.modal-backdrop{position:fixed;inset:0;background:rgba(8,16,30,.62);backdrop-filter:blur(3px);
  z-index:100;display:flex;align-items:center;justify-content:center;padding:16px;
  animation:fadeIn .16s ease-out}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);
  width:100%;max-width:620px;max-height:88vh;max-height:88dvh;display:flex;flex-direction:column;
  overflow:hidden;border:1px solid var(--border)}
.modal.wide{max-width:900px}
.modal-head{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;
  align-items:center;justify-content:space-between;gap:12px;background:var(--surface-2)}
.modal-head h3{margin:0}
.modal-body{padding:20px;overflow-y:auto;-webkit-overflow-scrolling:touch}
.modal-foot{padding:14px 20px;border-top:1px solid var(--border);display:flex;gap:10px;
  justify-content:flex-end;flex-wrap:wrap;background:var(--surface-2)}

/* ---------- toast ---------- */
.toasts{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(20px + env(safe-area-inset-bottom));
  z-index:150;display:flex;flex-direction:column;gap:9px;width:calc(100% - 32px);max-width:420px;
  pointer-events:none}
.toast{background:var(--navy-800);color:#fff;padding:12px 17px;border-radius:11px;
  box-shadow:var(--shadow-lg);font-size:.89rem;font-weight:600;display:flex;align-items:center;
  gap:10px;animation:toastIn .22s ease-out;pointer-events:auto}
.toast.ok{background:var(--green-700)} .toast.bad{background:var(--red-700)}
.toast.warn{background:var(--amber-600)}
@keyframes toastIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* ---------- misc ---------- */
.empty{text-align:center;padding:44px 20px;color:var(--text-2)}
.empty-icon{font-size:2.6rem;margin-bottom:12px;opacity:.5}
.empty h3{color:var(--text)}
.loading{display:flex;align-items:center;justify-content:center;gap:12px;padding:44px;
  color:var(--text-2);font-weight:600}
.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--accent);
  border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.divider{height:1px;background:var(--border);margin:18px 0;border:0}
.muted{color:var(--text-3)} .small{font-size:.83rem}
.mono{font-family:var(--mono);font-size:.87em}
.nowrap{white-space:nowrap}
.mt0{margin-top:0}.mb0{margin-bottom:0}.mt16{margin-top:16px}.mb8{margin-bottom:8px}
.flex{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.flex-between{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.spread{margin-left:auto}
.notice{border-radius:10px;padding:13px 16px;font-size:.87rem;margin-bottom:16px;
  border-left:4px solid var(--blue-600);background:var(--blue-100);color:var(--text-2)}
.notice b{color:var(--text)}
.notice.warn{border-left-color:var(--amber-600);background:var(--amber-100)}
.notice.danger{border-left-color:var(--red-600);background:var(--red-100)}
.notice.good{border-left-color:var(--green-600);background:var(--green-100)}
.kbd{display:inline-block;font-family:var(--mono);font-size:.76rem;padding:2px 7px;border-radius:5px;
  border:1px solid var(--border-strong);border-bottom-width:2px;background:var(--surface-3);
  color:var(--text-2);font-weight:700}

.streak-flame{display:inline-flex;align-items:center;gap:6px;background:var(--gold-100);
  color:var(--gold-600);border-radius:999px;padding:5px 13px;font-weight:800;font-size:.85rem}

.topic-perf{display:flex;flex-direction:column;gap:2px}
.acc-good{color:var(--green-600);font-weight:750}
.acc-mid{color:var(--gold-600);font-weight:750}
.acc-low{color:var(--red-600);font-weight:750}

.trend{display:flex;align-items:flex-end;gap:4px;height:78px;padding-top:6px}
.trend-bar{flex:1;min-width:7px;background:var(--accent);border-radius:4px 4px 0 0;position:relative;
  min-height:3px;transition:height .4s}
.trend-bar.good{background:var(--green-600)} .trend-bar.low{background:var(--red-600)}
.trend-bar.mid{background:var(--gold-500)}

/* calculator */
.calc{max-width:330px;margin:0 auto}
.calc-display{background:var(--navy-900);color:#fff;border-radius:11px;padding:16px;text-align:right;
  font-family:var(--mono);margin-bottom:12px;word-break:break-all}
.calc-display .cd-expr{font-size:.8rem;color:var(--navy-300);min-height:1.2em}
.calc-display .cd-val{font-size:1.85rem;font-weight:700}
.calc-keys{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.calc-keys button{min-height:54px;border-radius:10px;border:1px solid var(--border-strong);
  background:var(--surface);font-size:1.1rem;font-weight:650;cursor:pointer;font-family:inherit;
  color:var(--text);transition:background .1s}
.calc-keys button:active{background:var(--surface-3)}
.calc-keys button.op{background:var(--surface-3)}
.calc-keys button.eq{background:var(--accent);color:#fff;border-color:var(--accent)}
.calc-keys button.fn{background:var(--gold-100);color:var(--gold-600)}

/* print */
@media print{
  .topbar,.nav,.footer,.btn,.no-print,.toasts{display:none !important}
  body{background:#fff;color:#000;font-size:11pt}
  main{padding:0;max-width:none}
  .card,.qcard,.stat{box-shadow:none;border:1px solid #999;break-inside:avoid;page-break-inside:avoid}
  .ring::after{background:#fff}
  a{color:#000;text-decoration:none}
  h1,h2{page-break-after:avoid}
}

/* ---------- responsive ---------- */
@media (max-width:860px){
  .bar-row .bar{flex:0 0 32%}
}
@media (max-width:700px){
  :root{--chrome-h:90px}
  body{font-size:15px}
  main{padding:14px 11px 80px}
  h1{font-size:1.32rem} h2{font-size:1.14rem}
  .card,.qcard{padding:15px;border-radius:11px}
  .topbar-inner{padding:8px 11px;min-height:54px;gap:6px}
  .nav{top:54px}
  .iconbtn{width:36px;height:36px}
  .lang-toggle{padding:0 9px}
  .hide-sm{display:none !important}
  .brand-full{display:none}
  .brand-short{display:block}
  .brand-txt b{font-size:.9rem}
  .brand-txt span{font-size:.6rem}
  body.fullscreen-exam .exam-bar{margin:0 -11px 12px}
  .stat-value{font-size:1.5rem}
  .qstem{font-size:1rem}
  .opt{padding:12px;font-size:.93rem}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .tiles{grid-template-columns:repeat(2,1fr)}
  .tile{min-height:100px;padding:14px}
  .tile b{font-size:.9rem} .tile span{font-size:.75rem}
  .ring{width:98px;height:98px;flex-basis:98px}
  .ring b{font-size:1.3rem}
  .bar-row{flex-wrap:wrap}
  .bar-row .bar-label{flex:1 1 100%}
  .bar-row .bar{flex:1;max-width:none}
  .navigator{grid-template-columns:repeat(auto-fill,minmax(40px,1fr))}
  .navbtn{min-height:40px;font-size:.78rem}
  .modal{max-height:94vh;max-height:94dvh}
  .modal-body{padding:16px}
  .btn{font-size:.88rem;padding:10px 15px}
  .flash{min-height:300px}
  .flash-face{padding:18px}
}
@media (max-width:339px){
  .tiles{grid-template-columns:1fr}
  .grid-4{grid-template-columns:1fr}
}
@media (min-width:1000px){
  .dash-split{display:grid;grid-template-columns:1.55fr 1fr;gap:16px;align-items:start}
}