:root{
  --ink:#173042;--ink-2:#27485d;--muted:#667c8c;--paper:#f3f5f2;--surface:#ffffff;
  --surface-2:#edf1ef;--line:#d7dfdc;--brand:#156b66;--brand-dark:#0f504d;--brand-soft:#dceeea;
  --navy:#15364b;--amber:#c98a2e;--danger:#b7443e;--danger-soft:#fae9e7;--success:#26745d;
  --shadow:0 18px 45px rgba(26,53,67,.09);--shadow-sm:0 7px 22px rgba(26,53,67,.07);
  --radius:18px;--radius-sm:11px;--focus:#176e68;
}
:root:not(.light){
  --ink:#eff5f2;--ink-2:#d6e1dc;--muted:#9eb0aa;--paper:#101c22;--surface:#17262d;
  --surface-2:#1e3038;--line:#31474e;--brand:#62bdb1;--brand-dark:#87d2c8;--brand-soft:#203f3d;
  --navy:#dceae6;--amber:#e7b362;--danger:#ec817a;--danger-soft:#402b2c;--success:#74c7a7;
  --shadow:0 18px 45px rgba(0,0,0,.22);--shadow-sm:0 7px 22px rgba(0,0,0,.18);--focus:#85d4ca;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Segoe UI",Roboto,Helvetica,Arial,sans-serif;line-height:1.55;min-height:100vh}
body:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.28;background-image:linear-gradient(rgba(21,54,75,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(21,54,75,.025) 1px,transparent 1px);background-size:28px 28px}
button,input,select{font:inherit}
button,a{ -webkit-tap-highlight-color:transparent}
button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
a{color:inherit;text-decoration:none}
[hidden]{display:none!important}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(2rem,4vw,3.55rem);line-height:1.06;letter-spacing:-.045em}
h2{font-size:clamp(1.35rem,2.5vw,2rem);line-height:1.18;letter-spacing:-.025em}
h3{line-height:1.25}
small{color:var(--muted)}
.eyebrow{margin:0 0 10px;color:var(--brand);font-size:.76rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}
.muted{color:var(--muted)}
.app-shell{position:relative;max-width:1240px;margin:0 auto;padding:36px 24px 72px}
.screen{display:none}.screen.active{display:block}
.page-screen{animation:pageIn .22s ease-out}
@keyframes pageIn{from{opacity:.3;transform:translateY(5px)}to{opacity:1;transform:none}}

/* Brand and header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 91%,transparent);border-bottom:1px solid color-mix(in srgb,var(--line) 75%,transparent);backdrop-filter:blur(16px)}
.site-header.auth-mode{display:none}
.header-inner{max-width:1240px;margin:auto;padding:12px 24px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:22px}
.brand-button,.auth-brand{display:inline-flex;align-items:center;gap:11px;border:0;background:none;color:var(--ink);padding:0;text-align:left}
.brand-copy,.auth-brand>span:last-child{display:grid;line-height:1}
.brand-copy strong,.auth-brand strong{font-size:1.15rem;letter-spacing:-.02em}
.brand-copy small,.auth-brand small{font-size:.67rem;margin-top:5px;text-transform:uppercase;letter-spacing:.08em}
.brand-mark{width:34px;height:34px;display:flex;align-items:flex-end;justify-content:center;gap:3px;padding:7px;border-radius:9px;background:var(--navy)}
.brand-mark i{width:3px;border-radius:3px;background:#fff;display:block}.brand-mark i:nth-child(1){height:7px}.brand-mark i:nth-child(2){height:13px}.brand-mark i:nth-child(3){height:10px}.brand-mark i:nth-child(4){height:18px;background:#7dc9bf}
.brand-mark.large{width:43px;height:43px;padding:9px}.brand-mark.large i{width:4px}
.main-nav{display:flex;align-items:center;gap:4px}
.nav-item{display:flex;align-items:center;gap:7px;border:0;background:transparent;color:var(--muted);padding:9px 11px;border-radius:9px;font-weight:650}
.nav-item:hover,.nav-item.active{background:var(--surface-2);color:var(--ink)}
.nav-icon{font-size:1.05rem}
.header-account{display:flex;justify-content:flex-end;align-items:center;gap:10px}
.account-chip{display:flex;align-items:center;gap:9px;border:1px solid var(--line);background:var(--surface);padding:6px 10px 6px 6px;border-radius:12px;color:var(--ink)}
.account-avatar{width:31px;height:31px;display:grid;place-items:center;background:var(--brand-soft);color:var(--brand-dark);border-radius:8px;font-weight:850}
.account-text{display:grid;text-align:left;line-height:1.1}.account-text small{font-size:.65rem}.account-text strong{font-size:.82rem;margin-top:3px;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.icon-button{width:39px;height:39px;display:grid;place-items:center;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;font-size:1.2rem}
.text-link{font-size:.82rem;color:var(--brand);font-weight:700}

/* Auth */
.auth-screen{position:fixed;inset:0;overflow:auto;background:var(--paper);z-index:30}
.auth-layout{min-height:100vh;display:grid;grid-template-columns:minmax(360px,1.08fr) minmax(420px,.92fr)}
.auth-intro{position:relative;overflow:hidden;background:var(--navy);color:#fff;padding:48px clamp(34px,6vw,86px);display:flex;flex-direction:column}
.auth-intro:after{content:"";position:absolute;width:520px;height:520px;border:1px solid rgba(255,255,255,.13);border-radius:50%;right:-270px;bottom:-190px;box-shadow:0 0 0 70px rgba(255,255,255,.035),0 0 0 140px rgba(255,255,255,.025)}
.auth-brand{color:#fff;position:relative;z-index:1}
.auth-brand small{color:rgba(255,255,255,.65)}
.auth-intro-content{position:relative;z-index:1;margin:auto 0;max-width:690px}
.auth-intro .eyebrow{color:#8ed4cb}
.auth-intro h1{font-size:clamp(2.8rem,5vw,5.15rem);max-width:760px;margin-bottom:24px}
.auth-lead{max-width:650px;color:rgba(255,255,255,.76);font-size:1.08rem}
.auth-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:46px;background:rgba(255,255,255,.18);border-radius:13px;overflow:hidden;max-width:620px}
.auth-facts div{padding:19px;background:rgba(11,37,52,.64);display:grid}.auth-facts strong{font-size:1.55rem}.auth-facts span{color:rgba(255,255,255,.65);font-size:.77rem;margin-top:3px}
.auth-footnote{position:relative;z-index:1;margin:28px 0 0;color:rgba(255,255,255,.48);font-size:.75rem}
.auth-panel-wrap{display:grid;place-items:center;padding:42px;background:var(--paper)}
.auth-panel{width:min(440px,100%);background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:34px;box-shadow:var(--shadow)}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;padding:4px;background:var(--surface-2);border-radius:11px;margin-bottom:30px}
.auth-tab{border:0;background:transparent;color:var(--muted);padding:10px;border-radius:8px;font-weight:750}
.auth-tab.active{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}
.form-heading{margin-bottom:25px}.form-heading h2{margin-bottom:7px}.form-heading p{color:var(--muted);font-size:.92rem}
.auth-form{margin:0;padding:0;border:0}
.field{margin-bottom:17px}.field label{display:block;font-size:.82rem;font-weight:760;margin-bottom:7px}.field label span{font-weight:400;color:var(--muted)}
.field input,.field select{width:100%;height:47px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;padding:0 13px;transition:.16s border,.16s box-shadow}
.field input::placeholder{color:color-mix(in srgb,var(--muted) 72%,transparent)}
.field input:focus,.field select:focus{border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 12%,transparent);outline:none}
.field small{display:block;margin-top:6px;font-size:.73rem}
.password-field{position:relative}.password-field input{padding-right:55px}.password-toggle{position:absolute;right:6px;top:6px;height:35px;border:0;background:transparent;color:var(--brand);font-size:.75rem;font-weight:800}
.form-error{min-height:20px;margin:10px 0 0;color:var(--danger);font-size:.82rem}
.switch-copy{text-align:center;color:var(--muted);font-size:.84rem;margin:23px 0 0}.switch-copy button{border:0;background:none;color:var(--brand);font-weight:800;padding:0}
.privacy-note{text-align:center;max-width:440px;color:var(--muted);font-size:.72rem;margin:14px auto 0}

/* Buttons */
.btn{min-height:44px;border:1px solid transparent;border-radius:10px;padding:10px 16px;font-weight:780;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:.16s transform,.16s background,.16s border}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:var(--brand);color:#fff}.btn.primary:hover{background:var(--brand-dark)}
.btn.secondary{background:var(--surface);border-color:var(--line);color:var(--ink)}.btn.secondary:hover{border-color:color-mix(in srgb,var(--brand) 45%,var(--line));background:var(--surface-2)}
.btn.wide{width:100%}
.btn.danger-ghost{background:transparent;border-color:color-mix(in srgb,var(--danger) 50%,var(--line));color:var(--danger)}
.btn:disabled{opacity:.58;cursor:not-allowed;transform:none}
.text-button{border:0;background:none;color:var(--muted);font-weight:700;padding:10px}
.button-row{display:flex;gap:10px;flex-wrap:wrap}.button-stack{display:grid;gap:10px}.file-button{cursor:pointer}

/* Dashboard */
.dashboard-hero{position:relative;overflow:hidden;background:var(--navy);color:#fff;border-radius:24px;padding:clamp(28px,5vw,55px);display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:center;box-shadow:var(--shadow)}
.dashboard-hero:after{content:"";position:absolute;right:-70px;top:-120px;width:350px;height:350px;border:1px solid rgba(255,255,255,.12);border-radius:50%;box-shadow:0 0 0 55px rgba(255,255,255,.035)}
.dashboard-copy{position:relative;z-index:1}.dashboard-copy .eyebrow{color:#8ed4cb}.dashboard-copy h1{margin-bottom:12px}.dashboard-copy>p:not(.eyebrow):not(.action-hint){color:rgba(255,255,255,.7)}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:27px}.dashboard-hero .btn.secondary{background:transparent;border-color:rgba(255,255,255,.28);color:#fff}.dashboard-hero .btn.secondary:hover{background:rgba(255,255,255,.08)}
.action-hint{margin:11px 0 0;color:rgba(255,255,255,.56);font-size:.78rem}
.dashboard-signal{position:relative;z-index:1;border:1px solid rgba(255,255,255,.17);background:rgba(3,26,38,.28);border-radius:18px;padding:24px}
.signal-label{display:block;color:rgba(255,255,255,.64);font-size:.76rem;text-transform:uppercase;letter-spacing:.09em}.dashboard-signal strong{display:block;font-size:3.2rem;line-height:1;margin:12px 0 18px}
.signal-bars{height:72px;display:flex;gap:7px;align-items:flex-end}.signal-bars i{flex:1;background:#6fc1b6;border-radius:4px 4px 1px 1px;opacity:.9}.signal-bars i:nth-child(1){height:24%}.signal-bars i:nth-child(2){height:38%}.signal-bars i:nth-child(3){height:31%}.signal-bars i:nth-child(4){height:55%}.signal-bars i:nth-child(5){height:49%}.signal-bars i:nth-child(6){height:73%}.signal-bars i:nth-child(7){height:88%}
.dashboard-signal small{display:block;color:rgba(255,255,255,.5);margin-top:11px}
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin:17px 0 50px}
.metric-card{background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:18px 20px;box-shadow:var(--shadow-sm);display:grid}
.metric-card span{font-size:.78rem;color:var(--muted)}.metric-card strong{font-size:1.7rem;line-height:1.1;margin:8px 0;color:var(--navy)}.metric-card small{font-size:.72rem}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:18px}.section-heading h2{margin-bottom:0}.section-heading>p{max-width:480px;color:var(--muted);font-size:.88rem;margin-bottom:2px}
.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.mode-card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;min-height:215px;display:flex;flex-direction:column;box-shadow:var(--shadow-sm);transition:.18s transform,.18s border-color,.18s box-shadow}
.mode-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--brand) 38%,var(--line));box-shadow:var(--shadow)}
.mode-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}.mode-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:11px;background:var(--brand-soft);color:var(--brand-dark);font-weight:900;font-size:1.05rem}.mode-type{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:800}
.mode-card h3{margin-bottom:8px}.mode-card p{color:var(--muted);font-size:.84rem;margin-bottom:22px}.mode-card .btn{margin-top:auto;align-self:flex-start}
.source-note{margin-top:36px;border-top:1px solid var(--line);padding:20px 0;display:grid;grid-template-columns:230px 1fr;gap:20px;color:var(--muted);font-size:.83rem}.source-note strong{color:var(--ink)}.source-note p{margin:0}

/* General content */
.content-header{max-width:800px;margin:7px 0 27px}.content-header h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:11px}.content-header>p:last-child{color:var(--muted)}
.surface,.quiz-shell{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:clamp(20px,3vw,31px);box-shadow:var(--shadow-sm)}
.form-surface{max-width:950px}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:5px 17px}.availability{display:inline-block;background:var(--brand-soft);color:var(--brand-dark);padding:8px 11px;border-radius:8px;font-size:.8rem;margin:4px 0 20px}
.guided-surface{max-width:850px}.guided-intro{border-left:4px solid var(--brand);padding:2px 0 2px 18px;margin-bottom:22px}
.module-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}
.module-grid .card{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:24px;box-shadow:var(--shadow-sm)}
.module-grid .locked{opacity:.56}
.tag,.pill{display:inline-flex;padding:5px 9px;border-radius:7px;background:var(--brand-soft);color:var(--brand-dark);font-size:.72rem;font-weight:750;margin:2px}.tag.subtle{background:var(--surface-2);color:var(--muted)}
.progress{height:8px;background:var(--surface-2);border-radius:20px;overflow:hidden}.progress>span{display:block;height:100%;background:var(--brand);width:0;border-radius:20px}
.quiz-shell{max-width:940px;margin:auto;padding:clamp(22px,4vw,42px)}.quiz-topline{display:flex;justify-content:space-between;gap:12px;align-items:center}.timer{font-variant-numeric:tabular-nums;font-weight:850;color:var(--amber)}
.question-block{padding:35px 0 10px}.question-block h1{font-size:clamp(1.45rem,3vw,2.2rem);line-height:1.3;letter-spacing:-.025em}
.options{display:grid;gap:10px;margin:24px 0}.option{text-align:left;min-height:58px;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:650;transition:.15s border,.15s background,.15s transform}.option:hover{border-color:var(--brand);transform:translateX(2px)}.option.selected{border-color:var(--brand);background:var(--brand-soft)}.option.correct{border-color:var(--success);background:color-mix(in srgb,var(--success) 12%,var(--surface))}.option.wrong{border-color:var(--danger);background:var(--danger-soft)}
.quiz-actions{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.feedback-wrap{margin-top:20px}.feedback{border:1px solid color-mix(in srgb,var(--success) 35%,var(--line));border-left:5px solid var(--success);padding:19px;background:color-mix(in srgb,var(--success) 7%,var(--surface));border-radius:12px}.feedback.bad{border-left-color:var(--danger);border-color:color-mix(in srgb,var(--danger) 32%,var(--line));background:var(--danger-soft)}
.warn{border-left:4px solid var(--amber);padding:12px 15px;background:color-mix(in srgb,var(--amber) 9%,var(--surface));border-radius:8px}
.results-surface{max-width:950px}.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:11px}.kpi{text-align:center;background:var(--surface-2);padding:15px;border-radius:12px}.kpi strong{display:block;font-size:1.55rem;color:var(--brand-dark)}
.settings-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.setting-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0;border-bottom:1px solid var(--line)}.setting-row:last-child{border-bottom:0}.setting-row span{display:grid}.setting-row small{margin-top:3px}
.profile-summary{padding:0 0 18px}.profile-summary h3{margin-bottom:3px}
.divider{height:1px;background:var(--line);margin:23px 0}
.table-surface{overflow:auto}table{width:100%;border-collapse:collapse}td,th{padding:12px;border-bottom:1px solid var(--line);text-align:left;font-size:.84rem}th{color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em}

/* Modal and toast */
.modal{position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:20px}.modal-backdrop{position:absolute;inset:0;background:rgba(10,25,32,.58);backdrop-filter:blur(5px)}.modal-card{position:relative;width:min(500px,100%);background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:0 30px 80px rgba(0,0,0,.25)}.modal-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:22px}.modal-header h2{margin-bottom:0}
.toast{position:fixed;right:22px;bottom:22px;z-index:80;max-width:390px;padding:12px 16px;border-radius:10px;background:var(--navy);color:#fff;box-shadow:var(--shadow);opacity:0;transform:translateY(15px);pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:none}.toast.error{background:var(--danger)}
.loading-state{min-height:70vh;display:grid;place-items:center;align-content:center;text-align:center}.loader{width:36px;height:36px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;animation:spin .75s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}

/* Admin / install compatibility */
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow-sm)}
.status-ok{color:var(--success)}.status-bad,.form-error{color:var(--danger)}
.auth-shell{min-height:100vh;display:grid;place-items:center;padding:30px}.auth-card{width:min(620px,100%)}
.hero{padding:30px}

@media(max-width:1050px){
  .header-inner{grid-template-columns:auto 1fr}.main-nav{order:3;grid-column:1/-1;justify-content:center;border-top:1px solid var(--line);padding-top:8px}.header-account{justify-self:end}
  .auth-layout{grid-template-columns:1fr}.auth-intro{min-height:430px}.auth-intro-content{margin:65px 0}.auth-panel-wrap{padding:42px 22px}
  .mode-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:760px){
  .app-shell{padding:22px 15px 90px}.header-inner{padding:10px 14px;display:flex;justify-content:space-between}.brand-copy small,.account-text,.admin-link{display:none}.main-nav{position:fixed;z-index:25;left:10px;right:10px;bottom:10px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:7px;box-shadow:var(--shadow);display:grid;grid-template-columns:repeat(4,1fr)}.nav-item{display:grid;gap:1px;justify-items:center;font-size:.68rem;padding:5px}.nav-icon{font-size:1.1rem}
  .auth-intro{display:none}.auth-layout{display:block;min-height:100vh}.auth-panel-wrap{min-height:100vh;padding:25px 16px}.auth-panel{padding:25px 21px}.privacy-note{padding:0 10px}
  .dashboard-hero{grid-template-columns:1fr}.dashboard-signal{display:none}.metric-grid{grid-template-columns:repeat(2,1fr);margin-bottom:37px}.mode-grid,.module-grid,.settings-grid{grid-template-columns:1fr}.section-heading{display:block}.section-heading>p{margin-top:10px}.source-note{grid-template-columns:1fr;gap:4px}
  .kpis{grid-template-columns:repeat(2,1fr)}.quiz-actions .btn{flex:1}.content-header{margin-top:0}
}
@media(max-width:430px){
  .metric-grid{gap:8px}.metric-card{padding:15px}.auth-tabs{margin-bottom:23px}.auth-panel{border-radius:16px}.dashboard-hero{border-radius:18px;padding:26px 21px}.hero-actions .btn{width:100%}
}