:root{
  --bg:#f5f8fb;
  --surface:#ffffff;
  --surface-2:#eef6f9;
  --ink:#17324a;
  --muted:#6f8190;
  --brand:#123b5d;
  --brand-2:#1f6e8c;
  --brand-3:#3aa6a0;
  --success:#24966d;
  --warning:#d49a2b;
  --danger:#d65b59;
  --purple:#7768c9;
  --border:#dce6ec;
  --shadow:0 12px 35px rgba(18,59,93,.10);
  --radius:22px;
  --radius-sm:15px;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:"Tahoma","Arial",sans-serif}
button,input,select{font:inherit}
button{cursor:pointer}
body{min-height:100vh}
.app-shell{min-height:100vh}
.page{max-width:1180px;margin:0 auto;padding:22px 18px 120px}
.topbar{
  position:sticky;top:0;z-index:20;background:rgba(245,248,251,.92);
  backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,230,236,.75)
}
.topbar-inner{max-width:1180px;margin:auto;padding:12px 18px;display:flex;align-items:center;gap:12px}
.brand-mark{
  width:48px;height:48px;border-radius:16px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:23px;box-shadow:var(--shadow)
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-text strong{font-size:17px}
.brand-text span{font-size:12px;color:var(--muted)}
.topbar-actions{margin-right:auto;display:flex;gap:8px;align-items:center}
.icon-btn,.soft-btn,.primary-btn,.danger-btn,.answer-btn,.profile-card,.table-card,.action-card,.stage-card{
  border:0;transition:.18s ease
}
.icon-btn{width:42px;height:42px;border-radius:14px;background:#fff;color:var(--ink);border:1px solid var(--border)}
.icon-btn:hover,.soft-btn:hover,.profile-card:hover,.table-card:hover,.action-card:hover{transform:translateY(-2px)}
.soft-btn{padding:12px 16px;border-radius:14px;background:var(--surface-2);color:var(--brand);font-weight:700}
.primary-btn{padding:14px 20px;border-radius:16px;background:linear-gradient(135deg,var(--brand-2),var(--brand-3));color:white;font-weight:800;box-shadow:0 8px 20px rgba(31,110,140,.2)}
.primary-btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(31,110,140,.28)}
.danger-btn{padding:12px 15px;border-radius:14px;background:#fff0f0;color:#b83d3b;font-weight:700}
.full{width:100%}
.hero{
  border-radius:30px;padding:28px;background:
  radial-gradient(circle at 15% 20%,rgba(255,255,255,.23),transparent 26%),
  linear-gradient(135deg,#103b5d,#1f6e8c 60%,#3aa6a0);
  color:#fff;box-shadow:var(--shadow);position:relative;overflow:hidden
}
.hero:after{content:"×";position:absolute;left:25px;bottom:-55px;font-size:190px;opacity:.09;font-weight:900}
.hero h1{margin:4px 0 8px;font-size:clamp(28px,5vw,46px)}
.hero p{margin:0;opacity:.9;line-height:1.8;max-width:700px}
.hero-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:20px}
.hero .soft-btn{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.25)}
.section-title{display:flex;align-items:center;gap:10px;margin:28px 0 14px}
.section-title h2{margin:0;font-size:22px}
.section-title .eyebrow{font-size:12px;padding:6px 10px;background:var(--surface-2);color:var(--brand-2);border-radius:999px;font-weight:700}
.grid{display:grid;gap:14px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.kpi{display:flex;align-items:center;gap:13px}
.kpi-icon{width:50px;height:50px;border-radius:16px;display:grid;place-items:center;background:var(--surface-2);font-size:24px}
.kpi-value{font-size:24px;font-weight:900}
.kpi-label{font-size:13px;color:var(--muted);margin-top:2px}
.action-card{
  background:var(--surface);border:1px solid var(--border);border-radius:22px;padding:18px;text-align:right;color:var(--ink);box-shadow:var(--shadow)
}
.action-card .emoji{font-size:30px;display:block;margin-bottom:10px}
.action-card strong{display:block;font-size:18px;margin-bottom:5px}
.action-card span{font-size:13px;color:var(--muted);line-height:1.6}
.action-card.primary{background:linear-gradient(135deg,#ecf8f6,#e9f2f8);border-color:#c9e8e5}
.profile-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
.profile-card{
  padding:20px;border-radius:24px;background:#fff;border:2px solid transparent;box-shadow:var(--shadow);text-align:center;color:var(--ink)
}
.profile-card.active{border-color:var(--brand-3)}
.avatar{width:72px;height:72px;border-radius:24px;margin:auto auto 12px;display:grid;place-items:center;font-size:34px;background:linear-gradient(135deg,#eaf5f7,#dce9f4)}
.profile-card strong{display:block;font-size:18px}
.profile-card small{color:var(--muted)}
.add-profile{border:2px dashed #bfd0da;background:transparent;box-shadow:none}
.table-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.table-card{
  border:1px solid var(--border);border-radius:20px;background:#fff;padding:16px;min-height:128px;text-align:right;box-shadow:var(--shadow);color:var(--ink)
}
.table-card h3{margin:0 0 8px;font-size:25px}
.table-card .score{font-weight:900}
.table-card .status{font-size:12px;color:var(--muted)}
.stars{color:#e0a128;letter-spacing:2px;font-size:17px}
.progress{height:9px;background:#e8eef2;border-radius:999px;overflow:hidden}
.progress > span{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,var(--brand-2),var(--brand-3))}
.fact-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}
.fact{
  padding:12px;border-radius:15px;background:#fff;border:1px solid var(--border);text-align:center;font-weight:800
}
.fact small{display:block;color:var(--muted);font-weight:400;margin-top:3px}
.fact.weak{background:#fff1f0;border-color:#f1c4c2}
.fact.learning{background:#fff9ea;border-color:#ecd9ab}
.fact.good{background:#eef8f5;border-color:#c4e5d8}
.fact.mastered{background:#e9f7ef;border-color:#b8dfca}
.weak-list{display:flex;flex-direction:column;gap:10px}
.weak-row{display:grid;grid-template-columns:110px 1fr 80px;gap:10px;align-items:center;padding:12px 0;border-bottom:1px solid var(--border)}
.weak-row:last-child{border-bottom:0}
.tag{display:inline-flex;padding:6px 10px;border-radius:999px;background:var(--surface-2);font-size:12px;font-weight:800;color:var(--brand-2)}
.bottom-nav{
  position:fixed;z-index:30;bottom:14px;left:50%;transform:translateX(-50%);
  width:min(680px,calc(100% - 24px));display:grid;grid-template-columns:repeat(5,1fr);gap:8px;
  padding:8px;border-radius:24px;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border:1px solid var(--border);box-shadow:0 18px 40px rgba(20,50,70,.16)
}
.nav-btn{border:0;background:transparent;border-radius:17px;padding:9px 5px;color:var(--muted);font-size:11px}
.nav-btn b{display:block;font-size:21px;margin-bottom:2px}
.nav-btn.active{background:var(--surface-2);color:var(--brand-2);font-weight:800}
.question-page{max-width:780px;margin:auto;padding-top:10px}
.question-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}
.question-card{background:#fff;border:1px solid var(--border);border-radius:30px;padding:28px;box-shadow:var(--shadow);min-height:380px;display:flex;flex-direction:column;justify-content:center}
.question-text{text-align:center;font-size:clamp(34px,8vw,64px);font-weight:900;line-height:1.4;margin:12px 0 28px}
.question-sub{text-align:center;color:var(--muted);margin-top:-15px;margin-bottom:18px}
.answers{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.answer-btn{
  min-height:72px;border-radius:18px;background:#f8fbfc;border:2px solid #dce8ed;color:var(--ink);font-size:24px;font-weight:900
}
.answer-btn:hover{border-color:var(--brand-3);background:#eef9f8}
.answer-btn.correct{background:#e9f7ef;border-color:#62bf94;color:#176b4d}
.answer-btn.wrong{background:#fff0f0;border-color:#e9aaa7;color:#a43d3a}
.number-entry{display:flex;gap:10px;max-width:390px;margin:auto}
.number-entry input{
  flex:1;min-width:0;text-align:center;font-size:35px;font-weight:900;border:2px solid #dce8ed;border-radius:18px;padding:14px;background:#f8fbfc;color:var(--ink)
}
.feedback{text-align:center;margin-top:18px;font-weight:800;font-size:18px;min-height:28px}
.feedback.good{color:var(--success)}
.feedback.bad{color:var(--danger)}
.session-result{text-align:center}
.result-score{font-size:70px;font-weight:900;color:var(--brand-2);line-height:1}
.result-caption{color:var(--muted);margin-top:8px}
.modal-wrap{position:fixed;inset:0;z-index:70;background:rgba(15,35,50,.45);display:grid;place-items:center;padding:18px}
.modal{width:min(500px,100%);background:#fff;border-radius:28px;padding:22px;box-shadow:0 24px 70px rgba(0,0,0,.25)}
.modal h3{margin-top:0}
.field{display:flex;flex-direction:column;gap:7px;margin:13px 0}
.field label{font-size:13px;color:var(--muted);font-weight:700}
.field input,.field select{padding:13px 14px;border-radius:13px;border:1px solid var(--border);background:#fbfdfe;color:var(--ink)}
.form-row{display:flex;gap:10px;flex-wrap:wrap}
.form-row > *{flex:1}
.toast{
  position:fixed;z-index:90;bottom:100px;left:50%;transform:translateX(-50%);
  background:#17324a;color:white;padding:12px 18px;border-radius:15px;box-shadow:var(--shadow);animation:toastIn .2s ease
}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}
.stage-list{display:flex;flex-direction:column;gap:12px}
.stage-card{padding:17px;background:#fff;border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);display:grid;grid-template-columns:90px 1fr 100px;gap:15px;align-items:center;color:var(--ink)}
.stage-card.locked{opacity:.62}
.stage-code{width:70px;height:70px;border-radius:22px;display:grid;place-items:center;background:var(--surface-2);font-size:24px;font-weight:900;color:var(--brand-2)}
.stage-card h3{margin:0 0 6px}
.stage-card p{margin:0;color:var(--muted);font-size:13px}
.badges{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.badge{background:#fff;border:1px solid var(--border);border-radius:20px;padding:16px;text-align:center;box-shadow:var(--shadow)}
.badge .icon{font-size:34px;filter:grayscale(1);opacity:.35}
.badge.unlocked .icon{filter:none;opacity:1}
.badge strong{display:block;margin-top:8px}
.badge small{color:var(--muted)}
.diagnostic-map{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.diag-box{padding:15px;border-radius:17px;border:1px solid var(--border);background:#fff;text-align:center}
.diag-box.good{background:#e9f7ef}
.diag-box.mid{background:#fff8e7}
.diag-box.low{background:#fff0f0}
.settings-list{display:flex;flex-direction:column;gap:12px}
.setting-row{padding:15px;background:#fff;border:1px solid var(--border);border-radius:18px;display:flex;align-items:center;gap:12px;justify-content:space-between}
.switch{display:flex;background:#edf3f6;padding:4px;border-radius:14px}
.switch button{border:0;padding:8px 12px;border-radius:11px;background:transparent;color:var(--muted)}
.switch button.active{background:#fff;color:var(--brand);font-weight:800;box-shadow:0 4px 12px rgba(18,59,93,.08)}
.empty{padding:35px;text-align:center;color:var(--muted)}
.micro{font-size:12px;color:var(--muted)}
@media(max-width:800px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .table-grid{grid-template-columns:repeat(3,1fr)}
  .fact-grid{grid-template-columns:repeat(3,1fr)}
  .badges{grid-template-columns:repeat(2,1fr)}
  .stage-card{grid-template-columns:70px 1fr}
  .stage-card > .stars{grid-column:2}
  .diagnostic-map{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:520px){
  .page{padding:16px 12px 110px}
  .topbar-inner{padding:10px 12px}
  .brand-text span{display:none}
  .hero{padding:22px;border-radius:24px}
  .grid-2{grid-template-columns:1fr}
  .table-grid{grid-template-columns:repeat(2,1fr)}
  .answers{grid-template-columns:1fr}
  .question-card{padding:20px;min-height:350px}
  .weak-row{grid-template-columns:90px 1fr 60px}
  .diagnostic-map{grid-template-columns:repeat(2,1fr)}
}

/* Browser-only storage notice */
.browser-save-note{
  display:flex;gap:14px;align-items:flex-start;margin:18px 0 6px;padding:16px 18px;
  border:1px solid #e6d6a7;background:#fff9e8;border-radius:20px;color:#5d4a17;box-shadow:0 8px 22px rgba(90,70,20,.06)
}
.browser-save-note-icon{font-size:28px;line-height:1}
.browser-save-note strong{display:block;margin-bottom:5px;font-size:16px}
.browser-save-note p{margin:0;line-height:1.8;font-size:13px}
.empty-player-state{text-align:center;padding:26px 16px 12px;color:var(--muted)}
.empty-player-state>div{font-size:42px;margin-bottom:7px}
.empty-player-state strong{display:block;color:var(--ink);font-size:18px}
.empty-player-state p{margin:5px 0 0}
.danger-soft{color:#a43d3a;border-color:#efc8c5;background:#fff7f6}
@media(max-width:520px){.browser-save-note{padding:14px;gap:10px}.browser-save-note p{font-size:12px}}