:root{--blue:#0176d3;--navy:#032d60;--ink:#16325c;--bg:#f4f8fc;--line:#dce5f0;--green:#2e844a}
*{box-sizing:border-box}
body{margin:0;font-family:'Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
.hidden{display:none !important}
.muted{color:#5b6b85}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:14px 24px;background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff}
.brand{font-size:22px;font-weight:800;letter-spacing:.3px}
.brand span{opacity:.8}
.userbox{display:flex;align-items:center;gap:14px;font-size:14px}
.btn{background:var(--blue);color:#fff;border:none;border-radius:9px;padding:12px 18px;font-size:15px;font-weight:700;cursor:pointer}
.btn:hover{filter:brightness(1.07)}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff;border-radius:9px;padding:8px 14px;cursor:pointer;font-size:13px}
.player .btn-ghost{border-color:var(--line);color:#5b6b85}
/* auth */
.auth-view{display:flex;justify-content:center;padding:60px 20px}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;width:100%;max-width:380px;box-shadow:0 8px 30px rgba(3,45,96,.08)}
.auth-card h1{margin:0 0 4px;font-size:24px}
.auth-card input{width:100%;padding:12px 14px;margin:10px 0;border:1px solid var(--line);border-radius:9px;font-size:15px}
.auth-card .btn{width:100%;margin-top:6px}
.switch{font-size:14px;margin-top:16px;text-align:center}
.switch a{color:var(--blue);font-weight:700;text-decoration:none}
.msg{font-size:14px;min-height:18px;margin:10px 0 0}
.msg.error{color:#c23934}
.msg.ok{color:var(--green)}
/* app */
.app-view{display:grid;grid-template-columns:320px 1fr;gap:22px;max-width:1200px;margin:24px auto;padding:0 20px}
.sidebar{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;height:fit-content}
.progress-summary{display:flex;align-items:center;gap:14px;padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:12px}
.ring{width:58px;height:58px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;color:#fff;background:conic-gradient(var(--green) 0deg,#e3eaf3 0deg)}
.ring span{background:#fff;color:var(--ink);width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px}
.lesson-list{margin:0;padding:0}
.sec-group{border-bottom:1px solid var(--line)}
.sec-head{display:flex;align-items:center;gap:8px;padding:11px 6px;cursor:pointer;font-weight:700;font-size:14px;color:var(--navy)}
.sec-head:hover{background:var(--bg)}
.caret{display:inline-block;width:20px;font-size:16px;line-height:1;color:var(--blue);text-align:center;transition:transform .12s}
.sec-name{flex:1}
.sec-count{font-size:11px;color:#8294ad;font-weight:600}
.sec-body{padding:2px 0 8px 6px}
.subhead{font-size:10.5px;font-weight:800;letter-spacing:.5px;color:var(--blue);text-transform:uppercase;margin:8px 0 3px 6px}
.lesson-item{display:flex;align-items:center;gap:9px;padding:8px 8px 8px 14px;border-radius:8px;cursor:pointer;font-size:13.5px}
.lesson-item:hover{background:var(--bg)}
.lesson-item.active{background:#e9f3ff;font-weight:700}
.lesson-item.soon{cursor:default;opacity:.55}
.l-title{flex:1}
.tag{font-size:9px;font-weight:800;letter-spacing:.4px;padding:2px 6px;border-radius:10px}
.tag.free{background:#d6f0df;color:var(--green)}
.tag.soon{background:#eef0f4;color:#8294ad}
.dot{width:18px;height:18px;border-radius:50%;border:2px solid var(--line);flex:0 0 auto}
.dot.done{background:var(--green);border-color:var(--green);position:relative}
.dot.done::after{content:"✓";color:#fff;font-size:11px;position:absolute;left:3px;top:-2px}
.player{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;min-height:420px}
.player h2{margin:0 0 14px}
.video-wrap{position:relative;width:100%;aspect-ratio:16/9;background:#0b1b33;border-radius:12px;overflow:hidden}
.video-wrap iframe{width:100%;height:100%;border:0}
/* transparent click-blockers over YouTube's chrome (Share / Watch Later / Watch-on-YouTube),
   while leaving play, seek, volume and fullscreen usable */
.video-wrap .yt-block{position:absolute;z-index:6;background:transparent}
.video-wrap .yt-top{top:0;left:0;right:0;height:54px}
.video-wrap .yt-logo{bottom:0;right:46px;width:84px;height:42px}
.placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#9fb3cc;text-align:center;padding:20px}
.player-actions{display:flex;align-items:center;gap:14px;margin-top:16px;flex-wrap:wrap}
.badge{background:var(--green);color:#fff;border-radius:20px;padding:5px 12px;font-size:12px;font-weight:700}
@media(max-width:760px){.app-view{grid-template-columns:1fr}.sidebar{position:static;max-height:none;overflow:visible}}
/* quiz */
.quiz{margin-top:22px;border-top:1px solid var(--line);padding-top:18px}
.quiz-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.quiz-head h3{margin:0;font-size:18px}
.quiz-score{font-size:13px;font-weight:700;color:var(--green)}
.quiz-card{border:1px solid var(--line);border-radius:12px;padding:16px;margin:12px 0;background:#fff}
.quiz-q{font-weight:600;margin-bottom:10px}
.quiz-opts{display:flex;flex-direction:column;gap:8px}
.quiz-opt{text-align:left;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:#fff;cursor:pointer;font-size:14px}
.quiz-opt:hover:not(:disabled){border-color:var(--blue);background:#f3f8ff}
.quiz-opt:disabled{cursor:default}
.quiz-opt.right{background:#d9f2e3;border-color:var(--green);font-weight:700}
.quiz-opt.wrong{background:#fbe3e1;border-color:#c23934}
.quiz-exp{margin-top:10px;font-size:13.5px;color:#33425e;background:#f4f8fc;border-radius:8px;padding:10px 12px}
.review-missed{width:100%;margin-bottom:12px;background:#ff9a3c;color:#3a1e00}
/* review modal */
.modal{position:fixed;inset:0;background:rgba(3,45,96,.55);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal-card{background:#fff;border-radius:16px;max-width:640px;width:100%;padding:24px;max-height:88vh;overflow:auto}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.modal-head span{font-size:18px;font-weight:800;color:var(--navy)}
#review-close{border:1px solid var(--line);color:#5b6b85;background:#fff}
/* make any modal close button readable on the white card (default ghost is white-on-dark) */
.modal .btn-ghost{border:1px solid var(--line);color:#5b6b85;background:#fff}
.modal .btn-ghost:hover{background:var(--bg)}
.review-progress{font-size:13px;color:#5b6b85;margin-bottom:10px}
.reset-link{background:none;border:none;color:#c23934;font-size:12.5px;cursor:pointer;padding:0;text-decoration:underline}
/* owner analytics dashboard */
.analytics-card{max-width:880px}
.an-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:6px 0 8px}
.an-card{background:#f4f8fc;border:1px solid var(--line);border-radius:12px;padding:16px;text-align:center}
.an-num{font-size:30px;font-weight:900;color:var(--navy)}
.an-lab{font-size:12px;color:#5b6b85;margin-top:2px}
.an-h{font-size:15px;color:var(--navy);margin:16px 0 8px}
.an-note{font-size:12px;color:#8294ad;margin:-4px 0 8px}
.an-chart{height:200px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px}
.an-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:4px}
@media(max-width:700px){.an-grid{grid-template-columns:1fr}.an-cards{grid-template-columns:1fr}}
.an-table,.an-feed{max-height:240px;overflow-y:auto;border:1px solid var(--line);border-radius:10px}
.an-row{display:flex;align-items:center;gap:8px;padding:8px 11px;border-top:1px solid var(--line);font-size:13px}
.an-row:first-child{border-top:none}
.an-em{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.an-pct{font-weight:800;color:var(--blue)}
.an-meta{color:#8294ad;font-size:11.5px}
.an-acc{font-size:11px;color:var(--green);font-weight:700}
.an-frow{padding:8px 11px;border-top:1px solid var(--line);font-size:13px;line-height:1.4}
.an-frow:first-child{border-top:none}
.an-when{display:block;color:#8294ad;font-size:11px}
/* owner admin panel */
.admin-card{max-width:720px}
.admin-lookup{display:flex;gap:10px;margin:12px 0 4px}
.admin-lookup input{flex:1;padding:11px 13px;border:1px solid var(--line);border-radius:9px;font-size:15px}
.admin-lookup .btn{white-space:nowrap}
.admin-users{max-height:210px;overflow-y:auto;border:1px solid var(--line);border-radius:10px;margin:4px 0 6px}
.au-count{font-size:11px;font-weight:700;color:#8294ad;padding:7px 12px 4px;text-transform:uppercase;letter-spacing:.5px}
.au-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:9px 12px;cursor:pointer;font-size:14px;border-top:1px solid var(--line)}
.au-row:hover{background:var(--bg)}
.au-row.sel{background:#e9f3ff;font-weight:700}
.au-email{color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.au-date{color:#8294ad;font-size:12px;flex:0 0 auto}
.au-empty{padding:14px;color:#8294ad;font-size:13px;text-align:center}
.admin-student{font-size:15px;margin:14px 0 8px;color:var(--navy)}
.admin-tree{max-height:55vh;overflow-y:auto;border:1px solid var(--line);border-radius:10px;padding:6px}
.admin-row{display:flex;align-items:center;gap:10px;padding:7px 10px;border-radius:7px;cursor:pointer;font-size:14px}
.admin-row:hover{background:var(--bg)}
.admin-row input{width:17px;height:17px;flex:0 0 auto;cursor:pointer}
.admin-row .ar-label{flex:1}
.admin-row .ar-eff{font-size:10px;font-weight:800;letter-spacing:.3px;color:var(--green);background:#d6f0df;border-radius:10px;padding:2px 8px}
.admin-row.lvl-course{font-weight:800;color:var(--navy);background:#eef5ff;margin-bottom:4px}
.admin-row.lvl-section{font-weight:700;color:var(--navy);margin-top:6px;border-top:1px solid var(--line)}
.admin-row.lvl-lesson .ar-label{padding-left:18px;color:#33425e}
/* paywall / locked */
.lesson-item.locked{opacity:.72;cursor:pointer}
.tag.lock{background:#fff0e0;color:#b25a00}
.paywall{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#fff;padding:24px}
.paywall .lock-ico{font-size:42px;margin-bottom:4px}
.paywall h3{margin:0 0 6px;font-size:18px}
.paywall p{margin:4px 0;opacity:.92;font-size:14px}
.paywall-btns{display:flex;flex-direction:column;gap:10px;margin:14px 0 6px;width:100%;max-width:360px}
.paywall .btn{width:100%}
.paywall .btn.hero{background:#ff9a3c;color:#3a1e00}
.paywall-note{font-size:12px;opacity:.7}
#reset-all-btn{display:block;width:100%;text-align:center;margin:0 0 12px}
/* Start Here — free practice org */
.start-here-btn{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;text-align:left;background:linear-gradient(135deg,#ff9a3c,#ff7a00);color:#3a1e00;border:none;border-radius:12px;padding:13px 15px;font-weight:800;font-size:13.5px;cursor:pointer;margin-bottom:14px;box-shadow:0 6px 18px rgba(255,154,60,.35);animation:shPulse 2.4s ease-in-out infinite}
.start-here-btn:hover{transform:translateY(-2px);filter:brightness(1.06);animation-play-state:paused}
.start-here-btn:active{transform:translateY(0)}
.start-here-btn .sh-label{flex:1}
.start-here-btn .sh-arrow{font-size:19px;line-height:1;animation:shArrow 1.1s ease-in-out infinite}
.start-here-btn.active{outline:2px solid #ff7a00;outline-offset:1px;animation:none}
.start-here-btn.active .sh-arrow{animation:none}
@keyframes shPulse{0%,100%{box-shadow:0 6px 18px rgba(255,154,60,.35)}50%{box-shadow:0 9px 30px rgba(255,122,0,.7)}}
@keyframes shArrow{0%,100%{transform:translateX(0)}50%{transform:translateX(5px)}}
@media(prefers-reduced-motion:reduce){.start-here-btn,.start-here-btn .sh-arrow{animation:none}}
.video-wrap.setup-wrap{aspect-ratio:auto;background:#fff;border:1px solid var(--line);border-radius:12px;display:block;overflow:visible;padding:20px 22px}
.setup-video{aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000;margin-bottom:18px}
.setup-video iframe{width:100%;height:100%;border:0}
.setup-intro{font-size:15.5px;color:#33425e;line-height:1.6;margin:0 0 18px}
.setup-steps{display:flex;flex-direction:column;gap:13px;margin-bottom:20px}
.setup-step{display:flex;gap:12px;align-items:flex-start;font-size:14.5px;color:#33425e;line-height:1.55}
.setup-step .ss-n{flex:0 0 28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--blue),#6a5cff);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px}
.setup-step code{background:#eef3fa;border-radius:5px;padding:1px 6px;font-size:13px;color:var(--navy)}
.setup-cta{display:inline-block;text-decoration:none;font-size:16px;padding:14px 24px}
.setup-skip{margin-top:16px;font-size:13.5px;color:#33425e;background:#fff7ee;border:1px solid #ffe0bd;border-radius:9px;padding:11px 13px}
.quiz-head .reset-link{margin-left:12px}