/* Nadia Solver NG — "Ankara Night" theme: navy, teal, gold on warm paper. Mobile first. */
:root{--navy:#0b2447;--navy2:#143a6b;--teal:#0a9e7f;--teal-d:#07796209;--teal2:#087a63;--gold:#f2a900;--gold2:#ffd36b;--paper:#fbf8f1;--card:#ffffff;--ink:#14213d;--muted:#5b6b82;--line:#e8e1d2;--soft:#f3efe4;--danger:#c0392b;--ok:#15803d;--shadow:0 10px 30px rgba(11,36,71,.08);--r:18px;--font:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",sans-serif;--serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Noto Serif",serif}
:root[data-theme=dark]{--paper:#0b1424;--card:#13233b;--ink:#eaf0f8;--muted:#9db0c8;--line:#233652;--soft:#182b47;--shadow:0 10px 30px rgba(0,0,0,.35);--teal2:#2dd4a8}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--paper:#0b1424;--card:#13233b;--ink:#eaf0f8;--muted:#9db0c8;--line:#233652;--soft:#182b47;--shadow:0 10px 30px rgba(0,0,0,.35);--teal2:#2dd4a8}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);line-height:1.55;padding-bottom:calc(76px + env(safe-area-inset-bottom));min-height:100vh}
body.noscroll{overflow:hidden}
a{color:var(--teal2)}img{max-width:100%}
h1,h2,h3{font-family:var(--serif);letter-spacing:-.01em;line-height:1.2;margin:0 0 .5em}
h1{font-size:clamp(28px,6vw,42px)}h2{font-size:21px}h3{font-size:17px}
.muted{color:var(--muted)}.small{font-size:13px}.center{text-align:center}.big{font-size:18px;font-weight:700}
.hide{display:none!important}[hidden]{display:none!important}
.wrap{max-width:980px;margin:0 auto;padding:16px 16px 24px}
.eyebrow{font-size:11px;letter-spacing:.16em;font-weight:800;color:var(--teal2);text-transform:uppercase;margin:0 0 6px}
/* header */
.top{position:sticky;top:0;z-index:30;background:var(--navy);color:#fff;border-bottom:3px solid var(--gold);padding-top:env(safe-area-inset-top)}
.top-in{max-width:980px;margin:0 auto;display:flex;align-items:center;gap:10px;padding:8px 14px}
.brand{display:flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-weight:800;font-family:var(--serif);font-size:17px;white-space:nowrap}
.brand img{border-radius:10px;background:#fff}.brand b{color:var(--gold)}.crown{font-style:normal;font-size:14px}
.dnav{display:none;gap:4px;margin-left:12px}.dnav a{color:#cfe0f7;text-decoration:none;padding:8px 12px;border-radius:10px;font-size:14px;font-weight:600}
.dnav a[aria-current=page],.dnav a:hover{background:rgba(255,255,255,.12);color:#fff}
.top-ctl{margin-left:auto;display:flex;gap:6px;align-items:center}
.pill-ai{background:var(--gold);color:#3b2a00;text-decoration:none;font-weight:800;font-size:13px;padding:7px 12px;border-radius:99px;white-space:nowrap}
.chip-btn,.icon-btn{border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.08);color:#fff;border-radius:99px;padding:7px 11px;font:inherit;font-size:13px;cursor:pointer}
.icon-btn{width:36px;height:36px;padding:0;display:inline-grid;place-items:center;font-size:16px}
.sheet .icon-btn{border-color:var(--line);color:var(--ink);background:var(--soft)}
.netbar{background:#7a1f1f;color:#fff;font-size:13px;text-align:center;padding:6px 12px}
@media(max-width:380px){.chip-btn{padding:7px 8px;font-size:12px}.brand span{font-size:15px}}
@media(max-width:560px){.brand span{display:none}.brand img{width:34px;height:34px}}
/* bottom tabs */
.tabs{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;background:var(--card);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -6px 20px rgba(11,36,71,.08)}
.tabs a{flex:1;display:flex;flex-direction:column;align-items:center;gap:1px;padding:7px 2px 6px;text-decoration:none;color:var(--muted);font-size:11px;font-weight:700;min-width:0}
.tabs .ico{font-size:20px;line-height:1}.tabs .lbl{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.tabs a[aria-current=page]{color:var(--teal2)}.tabs a[aria-current=page] .ico{transform:translateY(-1px) scale(1.12)}
@media(min-width:820px){.tabs{display:none}body{padding-bottom:30px}.dnav{display:flex}}
/* adire-inspired hero */
.hero{position:relative;overflow:hidden;border-radius:24px;padding:22px 20px;color:#fff;background:linear-gradient(135deg,var(--navy) 0%,var(--navy2) 70%);box-shadow:var(--shadow)}
.hero::before{content:"";position:absolute;inset:0;opacity:.14;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='56' viewBox='0 0 56 56'%3E%3Cg fill='none' stroke='%23ffd36b' stroke-width='1.4'%3E%3Cpath d='M28 4l24 24-24 24L4 28z'/%3E%3Cpath d='M28 16l12 12-12 12-12-12z'/%3E%3Ccircle cx='28' cy='28' r='3'/%3E%3C/g%3E%3C/svg%3E");background-size:56px}
.hero>*{position:relative}.hero h1{color:#fff;margin-bottom:6px}.hero .eyebrow{color:var(--gold2)}.hero p{margin:0;color:#d6e4f7}
.stripe{height:6px;border-radius:99px;background:linear-gradient(90deg,#0a9e7f 0 33%,#fff 33% 66%,#0a9e7f 66%);margin:12px 0;opacity:.85}
/* cards & grid */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;margin:14px 0;box-shadow:var(--shadow)}
.grid{display:grid;gap:12px}.g2{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.g3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.between{justify-content:space-between}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}
.stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px 8px;text-align:center;box-shadow:var(--shadow)}
.stat b{display:block;font-family:var(--serif);font-size:26px;line-height:1.1;color:var(--ink)}.stat span{font-size:11px;color:var(--muted);font-weight:700}
.flame{color:#e8590c}
.tile{display:flex;gap:12px;align-items:center;text-decoration:none;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow)}
.tile .ti{font-size:26px;width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:var(--soft);flex:none}
.tile b{display:block}.tile small{color:var(--muted)}
.ring{--p:0;width:92px;height:92px;border-radius:50%;background:conic-gradient(var(--gold) calc(var(--p)*1%),var(--soft) 0);display:grid;place-items:center;flex:none}
.ring>div{color:var(--ink);width:72px;height:72px;border-radius:50%;background:var(--card);display:grid;place-items:center;text-align:center;font-weight:800;font-size:18px;line-height:1.1}.ring small{display:block;font-size:10px;color:var(--muted);font-weight:700}
.bars{display:flex;gap:6px;align-items:flex-end;height:70px}.bars div{flex:1;text-align:center;font-size:10px;color:var(--muted)}.bars i{display:block;background:var(--teal);border-radius:6px 6px 2px 2px;min-height:3px;margin-bottom:3px}
/* buttons & forms */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:0;border-radius:14px;padding:12px 18px;font:inherit;font-weight:800;font-size:15px;cursor:pointer;text-decoration:none;min-height:46px;transition:transform .08s}
.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.primary{background:var(--teal);color:#fff}.btn.gold{background:var(--gold);color:#3b2a00}.btn.navy{background:var(--navy);color:#fff}
.btn.ghost{background:transparent;border:1.5px solid var(--line);color:var(--ink)}.btn.danger{background:transparent;border:1.5px solid #e9b3ad;color:var(--danger)}
.btn.small{padding:7px 12px;min-height:34px;font-size:13px;border-radius:10px}.btn.block{display:flex;width:100%;margin-top:10px}
.link-btn{background:none;border:0;color:var(--teal2);font:inherit;font-weight:700;text-decoration:underline;cursor:pointer;padding:10px 0}
.lbl{display:block;font-size:13px;font-weight:800;margin:12px 0 6px}
.field,select.field,textarea.field{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:12px 13px;font:inherit;background:var(--card);color:var(--ink);min-height:46px}
textarea.field{min-height:110px;resize:vertical}.field:focus{outline:3px solid rgba(10,158,127,.25);border-color:var(--teal)}
.err{color:var(--danger);font-weight:700;font-size:14px}.ok{color:var(--ok);font-weight:700}
.chk{display:flex;gap:8px;align-items:center;margin:12px 0;font-weight:600}.chk input{width:20px;height:20px}
.chips{display:flex;gap:8px;overflow-x:auto;padding:4px 0 8px;scrollbar-width:none}.chips::-webkit-scrollbar{display:none}
.chip{flex:none;border:1.5px solid var(--line);background:var(--card);color:var(--ink);border-radius:99px;padding:7px 14px;font:inherit;font-weight:700;font-size:13px;cursor:pointer}
.chip.on{background:var(--navy);border-color:var(--navy);color:#fff}
.tag{display:inline-block;font-size:11px;font-weight:800;padding:3px 9px;border-radius:99px;background:var(--soft);color:var(--muted)}
.tag.gold{background:#fff1c9;color:#7a5200}.tag.teal{background:#d7f3ea;color:#0b6a55}
.daypick{display:flex;gap:6px;flex-wrap:wrap}.daypick label{margin:0}
.daypick input{position:absolute;opacity:0;pointer-events:none}
.daypick span{display:inline-block;min-width:44px;text-align:center;padding:9px 6px;border:1.5px solid var(--line);border-radius:10px;font-size:12px;font-weight:800;cursor:pointer}
.daypick input:checked+span{background:var(--teal);border-color:var(--teal);color:#fff}.daypick input:focus-visible+span{outline:3px solid rgba(10,158,127,.35)}
/* sheet & toast */
.sheet-wrap{position:fixed;inset:0;z-index:80;background:rgba(6,16,34,.55);display:flex;align-items:flex-end;justify-content:center}
.sheet{background:var(--card);color:var(--ink);width:100%;max-width:560px;border-radius:24px 24px 0 0;max-height:90vh;overflow:auto;padding:16px 18px calc(22px + env(safe-area-inset-bottom));animation:up .22s ease-out}
@media(min-width:700px){.sheet-wrap{align-items:center}.sheet{border-radius:24px}}
.sheet-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}.sheet-head h2{margin:0}
@keyframes up{from{transform:translateY(40px);opacity:0}}
#toasts{position:fixed;left:0;right:0;bottom:calc(90px + env(safe-area-inset-bottom));z-index:100;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none;padding:0 14px}
.toast{background:var(--navy);color:#fff;padding:11px 16px;border-radius:14px;font-weight:700;font-size:14px;box-shadow:var(--shadow);max-width:420px;text-align:center;animation:up .2s}.toast.out{opacity:0;transition:.3s}
.perks{padding-left:20px;margin:10px 0 14px}.perks li{margin:6px 0}
.keybox{font-family:ui-monospace,Menlo,monospace;font-size:22px;font-weight:800;text-align:center;letter-spacing:.06em;background:var(--soft);border:2px dashed var(--gold);border-radius:14px;padding:16px 8px;user-select:all}
.langlist{display:grid;gap:8px}.lang-opt{border:1.5px solid var(--line);background:var(--card);color:var(--ink);border-radius:14px;padding:14px;font:inherit;font-size:17px;font-weight:700;text-align:left;cursor:pointer}.lang-opt.on{border-color:var(--teal);background:rgba(10,158,127,.1)}
.alarm-box{text-align:center}.alarm-bell{font-size:64px;animation:ring .6s infinite}.alarm-box .row{justify-content:center;margin-top:12px}
@keyframes ring{0%,100%{transform:rotate(-12deg)}50%{transform:rotate(12deg)}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
/* ads */
.ad{position:relative;margin:14px 0;border:1px dashed var(--line);border-radius:14px;padding:18px 10px 10px;background:var(--soft);min-height:70px}
.ad-tag{position:absolute;top:4px;left:10px;font-size:10px;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.1em}
.house-ad{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}.house-ad span{font-size:24px}.house-ad b{flex:1}.house-ad i{font-style:normal;color:var(--teal2);font-weight:900}
/* library */
.books{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
.book{position:relative;border:1px solid var(--line);background:var(--card);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);cursor:pointer;text-align:left;font:inherit;color:inherit;padding:0}
.book .cover{height:112px;display:grid;place-items:center;font-size:44px;color:#fff;position:relative;background-image:linear-gradient(160deg,rgba(255,255,255,.22),rgba(0,0,0,.18))}
.book .cover::after{content:"";position:absolute;left:10px;top:0;bottom:0;width:3px;background:rgba(255,255,255,.35)}
.book .bi{padding:10px 12px 12px}.book h3{font-size:15px;margin:2px 0 4px}.book small{color:var(--muted);font-size:12px}
.book .lock{position:absolute;top:8px;right:8px;background:var(--gold);color:#3b2a00;font-weight:900;font-size:11px;padding:3px 8px;border-radius:99px}
.book .prog{height:4px;background:var(--soft)}.book .prog i{display:block;height:100%;background:var(--teal)}
.reader{position:fixed;inset:0;z-index:70;display:none;flex-direction:column;background:var(--rbg,#fff);color:var(--rfg,#1a1a1a)}
.reader.open{display:flex}.reader[data-rt=sepia]{--rbg:#f4ecd8;--rfg:#3b2f1e}.reader[data-rt=night]{--rbg:#0c1018;--rfg:#d7dde8}.reader[data-rt=light]{--rbg:#fff;--rfg:#1a1a1a}
.r-bar{display:flex;align-items:center;gap:8px;padding:8px 10px;background:var(--navy);color:#fff;padding-top:calc(8px + env(safe-area-inset-top))}
.r-bar .ttl{flex:1;min-width:0;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.r-bar button{background:rgba(255,255,255,.12);border:0;color:#fff;border-radius:10px;height:38px;min-width:38px;padding:0 10px;font:inherit;font-weight:800;cursor:pointer}
.r-tools{display:none;gap:8px;flex-wrap:wrap;padding:10px 12px;background:var(--soft);color:var(--ink);border-bottom:1px solid var(--line)}.r-tools.open{display:flex}
.r-body{flex:1;overflow:auto;-webkit-overflow-scrolling:touch}
.r-page{max-width:720px;margin:0 auto;padding:22px 20px 90px;font-family:var(--serif);font-size:var(--rfs,19px);line-height:1.85}
.r-page h2{font-size:1.15em;color:inherit}.r-page p{margin:0 0 1em;white-space:pre-wrap}
.w{cursor:pointer;border-radius:4px}.w:hover,.w.on{background:rgba(242,169,0,.35)}.w.read{background:rgba(10,158,127,.28)}
.r-foot{display:flex;gap:8px;align-items:center;justify-content:space-between;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:var(--navy);color:#fff}
.r-foot button{background:rgba(255,255,255,.14);border:0;color:#fff;border-radius:10px;height:40px;padding:0 14px;font:inherit;font-weight:800;cursor:pointer}.r-foot button:disabled{opacity:.4}
.wordcard{display:grid;gap:8px}.wordcard .ww{font-family:var(--serif);font-size:30px;font-weight:700}
.mean{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;background:var(--soft);padding:10px 12px;border-radius:12px;font-size:15px}.mean b{color:var(--muted);font-size:12px;text-transform:uppercase;align-self:center}
.vocab{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
/* planner */
.slot{display:flex;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:14px;background:var(--card);margin:8px 0}
.slot .tm{font-family:var(--serif);font-weight:800;min-width:84px;line-height:1.2}.slot .tm small{display:block;font-family:var(--font);color:var(--muted);font-weight:600}
.slot .sj{flex:1;min-width:0}.slot .sj b{display:block;overflow:hidden;text-overflow:ellipsis}
.slot.now{border-color:var(--teal);background:rgba(10,158,127,.08)}
.timer{font-family:var(--serif);font-size:64px;font-weight:800;text-align:center;letter-spacing:.02em;margin:6px 0}
.weekgrid{display:grid;gap:6px}.wk{display:grid;grid-template-columns:78px 1fr;gap:8px;align-items:start}.wk>b{font-size:13px;padding-top:8px}.wk.today>b{color:var(--teal2)}
/* chat */
.roomlist{display:grid;gap:8px}
.room{display:flex;gap:12px;align-items:center;border:1px solid var(--line);background:var(--card);border-radius:16px;padding:12px;cursor:pointer;text-align:left;font:inherit;color:inherit;width:100%}
.room .ri{width:46px;height:46px;border-radius:14px;background:var(--soft);display:grid;place-items:center;font-size:24px;flex:none}.room .rt{flex:1;min-width:0}.room b{display:block}.room small{color:var(--muted)}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#22c55e;margin-right:4px}
.chat{position:fixed;inset:0;z-index:60;display:none;flex-direction:column;background:var(--paper)}.chat.open{display:flex}
.chat-body{flex:1;overflow:auto;padding:12px 12px 8px;display:flex;flex-direction:column;gap:6px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='56' viewBox='0 0 56 56'%3E%3Cpath d='M28 4l24 24-24 24L4 28z' fill='none' stroke='%230a9e7f' stroke-opacity='.07' stroke-width='1.4'/%3E%3C/svg%3E")}
.msg{max-width:82%;padding:8px 12px;border-radius:16px;background:var(--card);border:1px solid var(--line);align-self:flex-start;word-wrap:break-word;overflow-wrap:anywhere}
.msg.me{align-self:flex-end;background:var(--teal);border-color:var(--teal);color:#fff}
.msg .who{font-size:12px;font-weight:800;color:var(--teal2);display:block}.msg.me .who{display:none}.msg time{display:block;font-size:10px;opacity:.7;text-align:right}
.msg.pending{opacity:.65}.msg .rp{background:none;border:0;color:var(--muted);font-size:11px;cursor:pointer;padding:0}
.chat-in{display:flex;gap:8px;padding:8px 10px calc(8px + env(safe-area-inset-bottom));background:var(--card);border-top:1px solid var(--line)}
.chat-in input{flex:1;border:1.5px solid var(--line);border-radius:99px;padding:12px 16px;font:inherit;background:var(--paper);color:var(--ink);min-width:0}
.partner{display:flex;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:16px;background:var(--card);margin:8px 0}
.avatar{width:44px;height:44px;border-radius:50%;background:var(--navy);color:var(--gold2);display:grid;place-items:center;font-weight:900;font-family:var(--serif);font-size:20px;flex:none}
.codebig{font-family:ui-monospace,Menlo,monospace;font-size:28px;font-weight:900;letter-spacing:.18em;text-align:center;background:var(--soft);padding:12px;border-radius:14px;border:2px dashed var(--gold)}
/* premium */
.plans{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.plan{position:relative;border:2px solid var(--line);border-radius:20px;padding:18px;background:var(--card);text-align:center;cursor:pointer;font:inherit;color:inherit}
.plan.sel{border-color:var(--teal);box-shadow:0 0 0 4px rgba(10,158,127,.15)}.plan .price{font-family:var(--serif);font-size:32px;font-weight:800;margin:4px 0}
.plan .ribbon{position:absolute;top:-11px;left:50%;transform:translateX(-50%);background:var(--gold);color:#3b2a00;font-size:11px;font-weight:900;padding:3px 12px;border-radius:99px;white-space:nowrap}
.tiers{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tiers .card{margin:0}.tiers ul{padding-left:18px;margin:8px 0 0;font-size:14px}.tiers li{margin:5px 0}
.premium-hero{background:linear-gradient(135deg,#3b2a00,#8a5d00 55%,#f2a900);}
footer{text-align:center;color:var(--muted);font-size:13px;padding:20px 16px 6px}footer a{color:var(--muted);margin:0 8px}
.answer{white-space:pre-wrap;line-height:1.75;overflow-wrap:anywhere}
.bar-pill{display:flex;gap:8px;align-items:center;background:var(--soft);border-radius:99px;padding:6px 12px;font-size:13px;font-weight:700}
/* compact 2-column quick actions on phones */
@media (max-width:560px){#quick{grid-template-columns:1fr 1fr;gap:10px}#quick .tile{flex-direction:column;align-items:flex-start;gap:8px;padding:14px}#quick .tile small{display:block;font-size:12px}}
.dim{opacity:.6}

/* focus mode while a test or exam is running: no help banner, no menus, no AI shortcut, no ads */
body.exam-on .tabs,body.exam-on .dnav,body.exam-on .pill-ai,body.exam-on #wa-fab,body.exam-on .wa-fab,body.exam-on .ad,body.exam-on .ad-slot,body.exam-on ins.adsbygoogle{display:none!important}
body.exam-on{padding-bottom:24px}

/* app lock screen */
#lockscreen{position:fixed;inset:0;z-index:9999;background:linear-gradient(160deg,#0b2447,#19376d);color:#fff;display:grid;place-items:center;padding:20px;outline:none}
#lockscreen .lk{width:100%;max-width:320px;text-align:center}#lockscreen h2{margin:10px 0 2px;color:#fff}
#lockscreen .lkmsg{color:#cfe0ff;min-height:22px;margin:0 0 14px}
#lockscreen .dots{display:flex;gap:12px;justify-content:center;margin-bottom:18px}#lockscreen .dots i{width:14px;height:14px;border-radius:50%;border:2px solid #cfe0ff}#lockscreen .dots i.on{background:#f5b800;border-color:#f5b800}
#lockscreen .pad{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}#lockscreen .pad button{height:62px;border-radius:50%;border:0;background:rgba(255,255,255,.12);color:#fff;font-size:24px;font-weight:700;cursor:pointer;-webkit-tap-highlight-color:transparent}#lockscreen .pad button:active{background:rgba(255,255,255,.3)}
#lockscreen .lkforgot{display:block;margin-top:18px;color:#cfe0ff;font-size:13px}
#lockscreen.shake .dots{animation:shk .35s}@keyframes shk{20%,60%{transform:translateX(-8px)}40%,80%{transform:translateX(8px)}}

/* ===== Premium layer v16: refined tokens, depth, rhythm, live-class helpers ===== */
:root{--paper:#f6f4ee;--line:#e6e0d1;--soft:#f1ede2;--teal:#0b9c80;--gold:#e9a400;--gold-g:linear-gradient(135deg,#ffd36b,#f0a800);--navy-g:linear-gradient(135deg,#0b2447 0%,#14386a 62%,#1b4a85 100%);--r:16px;--r-s:12px;
--shadow:0 1px 2px rgba(11,36,71,.05),0 8px 24px -10px rgba(11,36,71,.14);--shadow-l:0 2px 4px rgba(11,36,71,.06),0 18px 40px -14px rgba(11,36,71,.28);--ring:0 0 0 3px rgba(11,156,128,.28);--ease:cubic-bezier(.2,.7,.2,1)}
:root[data-theme=dark]{--shadow:0 1px 2px rgba(0,0,0,.4),0 10px 28px -10px rgba(0,0,0,.6);--shadow-l:0 20px 44px -14px rgba(0,0,0,.7);--teal2:#34d6ac;--paper:#08111f;--card:#101e35;--soft:#16294a;--line:#22385a}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--shadow:0 1px 2px rgba(0,0,0,.4),0 10px 28px -10px rgba(0,0,0,.6);--shadow-l:0 20px 44px -14px rgba(0,0,0,.7);--teal2:#34d6ac;--paper:#08111f;--card:#101e35;--soft:#16294a;--line:#22385a;--navy:#0a1a33}}
html{-webkit-tap-highlight-color:transparent}
body{font-size:16px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
h1,h2,h3{letter-spacing:-.02em;text-wrap:balance}h1{font-weight:800}h2{font-weight:700}p{text-wrap:pretty}
img,video,canvas,svg{max-width:100%}table{max-width:100%}pre,code{overflow-wrap:anywhere}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:10px}
::selection{background:rgba(233,164,0,.35)}
.top{background:var(--navy-g);border-bottom:0;box-shadow:0 2px 0 var(--gold),0 6px 18px -8px rgba(11,36,71,.55)}
.brand{letter-spacing:-.01em}.dnav a{transition:background .15s}
.pill-ai{background:var(--gold-g);box-shadow:0 2px 8px -2px rgba(233,164,0,.6);min-height:36px;display:inline-flex;align-items:center}
.chip-btn,.icon-btn{min-height:36px;transition:background .15s}.chip-btn:active,.icon-btn:active{background:rgba(255,255,255,.2)}
.tabs{box-shadow:0 -1px 0 var(--line),0 -10px 24px -12px rgba(11,36,71,.18)}
.tabs a{position:relative;min-height:56px;justify-content:center;transition:color .15s}
.tabs a[aria-current=page]::before{content:"";position:absolute;top:0;left:30%;right:30%;height:3px;border-radius:0 0 4px 4px;background:var(--gold-g)}
.tabs .ico{transition:transform .2s var(--ease)}
.hero{border-radius:22px;padding:24px 20px 22px;background:var(--navy-g);box-shadow:var(--shadow-l)}
.hero::after{content:"";position:absolute;right:-40px;top:-60px;width:200px;height:200px;border-radius:50%;background:radial-gradient(closest-side,rgba(255,211,107,.28),transparent);pointer-events:none}
.hero h1{font-size:clamp(26px,7vw,40px)}.hero p{line-height:1.5}
.stripe{height:4px;background:var(--gold-g);width:64px;opacity:1;margin:14px 0 4px}
.card{border-radius:var(--r);padding:18px;box-shadow:var(--shadow);transition:box-shadow .2s}
.card h2,.card h3{margin-top:0}
.stat,.tile,.book,.room,.partner,.sub-card,.slot{box-shadow:var(--shadow);border-radius:var(--r)}
.tile,.book,.room,.sub-card{transition:transform .15s var(--ease),box-shadow .2s}
.tile:active,.book:active,.room:active,.sub-card:active{transform:scale(.985)}
@media(hover:hover){.tile:hover,.book:hover,.room:hover,.sub-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-l)}}
.tile .ti{background:linear-gradient(145deg,var(--soft),var(--card));border:1px solid var(--line)}
.stat b{font-weight:800}
.btn{border-radius:var(--r-s);min-height:46px;letter-spacing:.005em;transition:transform .1s,box-shadow .2s,filter .15s,background .15s;-webkit-user-select:none;user-select:none}
.btn.primary{background:linear-gradient(180deg,#10ad8f,#0a8f76);box-shadow:0 6px 14px -6px rgba(10,143,118,.7),inset 0 1px 0 rgba(255,255,255,.25)}
.btn.gold{background:var(--gold-g);box-shadow:0 6px 14px -6px rgba(233,164,0,.7),inset 0 1px 0 rgba(255,255,255,.4)}
.btn.navy{background:var(--navy-g);box-shadow:0 6px 14px -6px rgba(11,36,71,.6)}
.btn.ghost{background:var(--card)}.btn.danger{background:var(--card)}
.btn:hover{filter:brightness(1.05)}.btn:active{transform:scale(.97);filter:brightness(.96)}.btn.small{min-height:38px}
.btn:disabled{filter:grayscale(.3)}
.btn.loading,.btn[aria-busy=true]{position:relative;color:transparent!important;pointer-events:none}
.btn.loading::after,.btn[aria-busy=true]::after{content:"";position:absolute;width:18px;height:18px;border-radius:50%;border:2.5px solid rgba(255,255,255,.5);border-top-color:#fff;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.field,select.field,textarea.field{border-radius:var(--r-s);font-size:16px;min-height:48px;transition:border-color .15s,box-shadow .15s;background:var(--card)}
.field:focus{outline:none;border-color:var(--teal);box-shadow:var(--ring)}
.field::placeholder{color:var(--muted);opacity:.7}
select.field{appearance:none;-webkit-appearance:none;padding-right:38px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%235b6b82' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}
input,select,textarea,button{font-family:inherit}
input[type=checkbox],input[type=radio]{accent-color:var(--teal)}
.lbl{letter-spacing:.01em}
.chip{min-height:38px;transition:background .15s,color .15s,border-color .15s}.chip.on{background:var(--navy-g);box-shadow:0 4px 10px -4px rgba(11,36,71,.5)}
.tag{letter-spacing:.02em}
.seg2 button,.opt,.plan,.lang-opt{transition:border-color .15s,background .15s,box-shadow .15s,transform .1s}
.seg2 button{min-height:44px;border-radius:var(--r-s)}.opt{border-radius:var(--r-s);min-height:48px}.opt:active{transform:scale(.99)}
.plan{border-radius:18px}.plan.sel{background:linear-gradient(180deg,rgba(11,156,128,.06),transparent)}
.sheet-wrap{background:rgba(6,16,34,.6)}.sheet{border-radius:22px 22px 0 0;box-shadow:var(--shadow-l)}
.sheet::before{content:"";display:block;width:40px;height:4px;border-radius:4px;background:var(--line);margin:0 auto 12px}
@media(min-width:700px){.sheet{border-radius:22px}.sheet::before{display:none}}
.toast{background:var(--navy-g);border:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow-l)}
.netbar{background:#8a2020}
.avatar{background:var(--navy-g);box-shadow:0 0 0 2px var(--gold)}
.msg{border-radius:18px 18px 18px 6px}.msg.me{border-radius:18px 18px 6px 18px;background:linear-gradient(180deg,#10ad8f,#0a8f76)}
.chat-in input{min-height:46px}
.r-bar,.r-foot{background:var(--navy-g)}
.keybox,.codebig{background:linear-gradient(180deg,var(--soft),var(--card));border-color:var(--gold)}
.ad{border-radius:var(--r-s)}
footer{padding:26px 16px 10px;line-height:2}footer a{text-decoration:none;font-weight:600;padding:6px 4px;display:inline-block}footer a:hover{color:var(--teal2)}
a{text-underline-offset:3px}
/* skeleton / loading */
.skel{position:relative;overflow:hidden;background:var(--soft);border-radius:var(--r-s);min-height:16px}
.skel::after{content:"";position:absolute;inset:0;transform:translateX(-100%);background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent);animation:shim 1.3s infinite}
@keyframes shim{to{transform:translateX(100%)}}
@media(prefers-color-scheme:dark){.skel::after{background:linear-gradient(90deg,transparent,rgba(255,255,255,.08),transparent)}}
/* callouts and badges */
.note{display:flex;gap:10px;align-items:flex-start;background:linear-gradient(180deg,rgba(11,156,128,.09),rgba(11,156,128,.04));border:1px solid rgba(11,156,128,.3);border-left:4px solid var(--teal);border-radius:var(--r-s);padding:11px 14px;margin:12px 0;font-size:14px;line-height:1.5}
.note.warn{background:rgba(233,164,0,.1);border-color:rgba(233,164,0,.4);border-left-color:var(--gold)}
.note.bad{background:rgba(192,57,43,.08);border-color:rgba(192,57,43,.3);border-left-color:var(--danger)}
.badge{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:800;letter-spacing:.03em;padding:3px 10px;border-radius:99px;background:var(--soft);color:var(--muted);white-space:nowrap}
.badge.ok{background:rgba(21,128,61,.14);color:var(--ok)}.badge.warn{background:rgba(233,164,0,.2);color:#8a5d00}
.badge.lock{background:var(--gold-g);color:#3b2a00;box-shadow:0 2px 6px -2px rgba(233,164,0,.7)}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .badge.warn{color:#ffd36b}:root:not([data-theme=light]) .tag.gold{background:rgba(233,164,0,.2);color:#ffd36b}:root:not([data-theme=light]) .tag.teal{background:rgba(52,214,172,.16);color:#34d6ac}:root:not([data-theme=light]) .btn.danger{border-color:#7a2b25}}
.lock-ribbon{position:absolute;top:10px;right:-6px;background:var(--gold-g);color:#3b2a00;font-size:11px;font-weight:900;padding:4px 12px 4px 10px;border-radius:6px 0 0 6px;box-shadow:0 3px 8px -2px rgba(0,0,0,.35);z-index:2}
.lock-ribbon::after{content:"";position:absolute;right:0;bottom:-5px;border:3px solid transparent;border-top-color:#a87300;border-right-color:#a87300}
.is-locked{position:relative;overflow:hidden}.is-locked .cover,.is-locked>*:not(.lock-ribbon){filter:saturate(.7)}
/* live classroom */
.live{display:flex;flex-direction:column;gap:12px;min-height:60vh}
.live-stage{position:relative;border-radius:var(--r);overflow:hidden;background:#050b17;box-shadow:var(--shadow-l)}
.live-video{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;background:#050b17;border-radius:var(--r);border:0}
.live-stage .live-video{border-radius:0}
.live-stage .live-label{position:absolute;left:10px;bottom:10px;background:rgba(0,0,0,.55);color:#fff;font-size:12px;font-weight:700;padding:4px 10px;border-radius:99px;max-width:70%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.live-tiles{display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(104px,1fr))}
.live-tile{position:relative;aspect-ratio:1;border-radius:14px;background:linear-gradient(145deg,#14386a,#0b2447);color:#fff;display:grid;place-items:center;font-weight:800;font-size:22px;overflow:hidden;border:2px solid transparent;transition:border-color .15s}
.live-tile.speaking{border-color:var(--teal);box-shadow:0 0 0 3px rgba(11,156,128,.35)}
.live-tile video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.live-tile small{position:absolute;left:6px;right:6px;bottom:5px;font-size:11px;font-weight:700;text-align:center;background:rgba(0,0,0,.5);border-radius:99px;padding:1px 6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.live-tile .hand{position:absolute;top:4px;right:6px;font-size:18px}
.live-bar{position:sticky;bottom:calc(64px + env(safe-area-inset-bottom));z-index:20;display:flex;gap:10px;justify-content:center;align-items:center;padding:10px 12px;background:var(--card);border:1px solid var(--line);border-radius:99px;box-shadow:var(--shadow-l);margin:0 auto;width:fit-content;max-width:100%}
@media(min-width:820px){.live-bar{bottom:16px}}
body.exam-on .live-bar{bottom:12px}
.rb{width:50px;height:50px;border-radius:50%;border:0;background:var(--soft);color:var(--ink);font-size:21px;display:grid;place-items:center;cursor:pointer;flex:none;transition:transform .1s,background .15s}
.rb:active{transform:scale(.92)}.rb.on{background:linear-gradient(180deg,#10ad8f,#0a8f76);color:#fff}.rb.off{background:#e6e1d4;color:#7a8396;text-decoration:line-through}
.rb.danger{background:linear-gradient(180deg,#d9483a,#b3281c);color:#fff}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .rb.off{background:#27334a;color:#8191ab}}
.live-chat{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--r);background:var(--card);max-height:280px;overflow:hidden}
.live-chat .lc-body{flex:1;overflow:auto;padding:10px 12px;display:flex;flex-direction:column;gap:6px;font-size:14px}
.live-chat .lc-in{display:flex;gap:8px;padding:8px;border-top:1px solid var(--line)}.live-chat .lc-in input{flex:1;min-width:0;border:1.5px solid var(--line);border-radius:99px;padding:10px 14px;background:var(--paper);color:var(--ink);font-size:16px}
.live-chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:800;padding:5px 11px;border-radius:99px;background:var(--soft);color:var(--ink)}
.live-chip.on{background:rgba(217,72,58,.12);color:#c0392b}
.pulse-dot{display:inline-block;width:10px;height:10px;border-radius:50%;background:#e5372a;box-shadow:0 0 0 0 rgba(229,55,42,.6);animation:pulse 1.5s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(229,55,42,0)}100%{box-shadow:0 0 0 0 rgba(229,55,42,0)}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* mode switch + welcome page */
.modebar{display:flex;gap:6px;max-width:760px;margin:10px auto 0;padding:0 16px}
.modebar a{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:10px 6px;border-radius:14px;background:var(--card);border:1.5px solid var(--line);color:var(--ink);font-weight:800;font-size:14px;text-decoration:none;box-shadow:var(--shadow-s,0 1px 3px rgba(11,36,71,.08))}
.modebar a[aria-current=page]{background:linear-gradient(180deg,#14407f,#0b2447);color:#fff;border-color:#0b2447}
.wl{max-width:460px;margin:0 auto;padding:18px 16px 40px}.wl-logo{display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;margin:6px 0 14px}
.wl-logo img{width:84px;height:84px;border-radius:22px;box-shadow:0 10px 30px rgba(11,36,71,.3)}.wl-logo h1{margin:4px 0 0;font-size:25px}
.wl-tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:var(--soft);padding:5px;border-radius:16px;margin-bottom:12px}
.wl-tabs button{border:0;border-radius:12px;padding:12px;font-weight:800;font-size:15px;background:transparent;color:var(--ink);cursor:pointer}
.wl-tabs button.on{background:var(--card);box-shadow:0 2px 8px rgba(11,36,71,.15);color:#0b2447}
.roles{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:6px 0 10px}
.roles button{border:2px solid var(--line);background:var(--card);border-radius:16px;padding:12px 4px;font-weight:800;font-size:13px;color:var(--ink);display:flex;flex-direction:column;align-items:center;gap:4px;cursor:pointer}
.roles button span{font-size:26px}.roles button.on{border-color:#f2b632;background:#fff8e6;color:#0b2447;box-shadow:0 0 0 3px rgba(242,182,50,.25)}
.wl .field{margin-bottom:8px}.wl label{font-size:12px;color:var(--muted);font-weight:700}

/* v24: always-visible settings gear in the header */
.set-btn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:12px;background:rgba(255,255,255,.14);color:#fff;text-decoration:none;border:1px solid rgba(255,255,255,.22);flex:none}.set-btn:hover,.set-btn:active{background:rgba(255,255,255,.26)}.set-btn[aria-current=page]{background:#f0b429;color:#0b2447;border-color:#f0b429}
@media(max-width:430px){.top-ctl{gap:6px}.top-ctl .chip-btn{padding:0 9px;font-size:12px}.pill-ai{padding:7px 10px}.brand span{font-size:15px}}