:root{
  --ink:#1d2a2a; --muted:#6b7776; --bg:#fbf7f2; --card:#fff; --line:#ece4da;
  --teal:#0f3d3e; --teal2:#1f6b6c; --coral:#e8664a; --ok:#1f8a5b; --bad:#c2413a; --warn:#b7791f;
  --r:16px; --shadow:0 2px 10px rgba(15,61,62,.07);
}
*{box-sizing:border-box}
html,body{margin:0}
body{font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--teal2)}
h1,h2,h3{line-height:1.2;margin:.2em 0 .5em}
h1{font-size:1.8rem} h2{font-size:1.35rem;margin-top:1.4em}
.muted{color:var(--muted)} .small{font-size:.85rem} .center{text-align:center} .left{text-align:left}
.wrap{max-width:1080px;margin:0 auto;padding:16px}
.narrow{max-width:480px;margin:24px auto}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow);margin-bottom:16px}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}

/* buttons */
.btn{display:inline-block;background:var(--coral);color:#fff;border:0;border-radius:999px;padding:11px 22px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;transition:transform .1s,filter .15s}
.btn:hover{filter:brightness(1.05)} .btn:active{transform:scale(.97)} .btn:disabled{opacity:.6}
.btn-sm{padding:6px 14px;font-size:.9rem} .btn-lg{padding:14px 30px;font-size:1.1rem} .btn-block{display:block;width:100%;text-align:center}
.btn-ghost{background:transparent;color:var(--teal);border:2px solid var(--teal)}
.icon-btn{background:none;border:0;font-size:1.25rem;cursor:pointer;padding:6px;border-radius:10px}
.icon-btn:hover{background:#0001}
.mini{background:#f2ede6;border:0;border-radius:999px;padding:3px 10px;font-size:.8rem;cursor:pointer;color:var(--ink)}
.chip{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 14px;margin:4px;cursor:pointer;font:inherit;font-size:.9rem}
.chip.on{background:var(--teal);color:#fff;border-color:var(--teal)}
.tag{background:var(--coral);color:#fff;font-size:.65rem;padding:2px 6px;border-radius:6px;vertical-align:middle}
.pill{display:inline-block;background:#fff3;border:1px solid #fff5;color:#fff;border-radius:999px;padding:4px 12px;font-size:.85rem}

/* forms */
.form label{display:block;margin:0 0 12px;font-weight:600;font-size:.92rem}
.form input:not([type=checkbox]):not([type=radio]):not([type=range]):not([type=color]),.form select,.form textarea,.searchbar input{display:block;width:100%;margin-top:4px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff}
.form input[type=range]{width:100%}
.form label.check{font-weight:400;display:flex;gap:8px;align-items:center}
.grid-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0 16px;align-items:end}
.grid-form .wide{grid-column:1/-1}
.alert{background:#fdecea;color:var(--bad);border-radius:10px;padding:10px 14px;margin:8px 0}
.flash{background:var(--teal);color:#fff;text-align:center;padding:10px}

/* top bar */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 18px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;color:var(--teal);text-decoration:none;font-size:1.1rem}
.brand img{width:30px;height:30px;border-radius:8px}
.topbar nav{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.topbar nav a{text-decoration:none;color:var(--ink);font-weight:500}
.topbar nav a.btn{color:#fff}
.foot{display:flex;gap:16px;justify-content:center;padding:28px 16px;color:var(--muted);font-size:.85rem;flex-wrap:wrap}

/* landing */
.hero{background:linear-gradient(135deg,var(--teal),var(--teal2));color:#fff;display:grid;grid-template-columns:1.1fr 1fr;gap:32px;padding:56px max(16px,calc((100vw - 1080px)/2));align-items:center}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);margin:.4em 0}
.hero p{font-size:1.1rem;opacity:.92}
.hero .muted{color:#d5e6e5}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0 10px}
.hero .btn-ghost{color:#fff;border-color:#fff}
.hero-demo{background:#fff;color:var(--ink);border-radius:22px;padding:20px;box-shadow:0 20px 50px #0004;display:flex;flex-direction:column;gap:10px}
.demo-bubble{padding:10px 14px;border-radius:16px;max-width:85%}
.demo-bubble.tutor{background:#f2ede6;align-self:flex-start;border-bottom-left-radius:4px}
.demo-bubble.me{background:var(--coral);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.demo-fix{background:#effaf4;border-left:4px solid var(--ok);padding:8px 12px;border-radius:8px;font-size:.92rem;align-self:flex-end;max-width:90%}
.band{background:#f3ece3;padding:32px 0;margin:32px 0}
.feature{background:#fff;border-radius:var(--r);padding:20px}
.ficon{font-size:2rem}
.feature p{color:var(--muted);margin:0}
.tutor-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}
.tutor-card{background:#fff;border:2px solid var(--line);border-radius:var(--r);padding:16px;text-align:center;position:relative;cursor:default;display:block}
.tutor-card h3{margin:.4em 0 .2em;font-size:1.05rem}
.tutor-card p{margin:0 0 4px;font-size:.88rem;color:var(--muted)}
.avatar{width:64px;height:64px;border-radius:50%;background:color-mix(in srgb,var(--c,#0f3d3e) 18%,#fff);border:3px solid var(--c,#0f3d3e);display:inline-grid;place-items:center;font-size:2rem}
.avatar.sm{width:38px;height:38px;font-size:1.2rem;border-width:2px;flex:none}
.tutor-row.pick .tutor-card{cursor:pointer}
.tutor-row.pick input{position:absolute;opacity:0}
.tutor-row.pick .tutor-card:has(input:checked){border-color:var(--c);box-shadow:0 0 0 3px color-mix(in srgb,var(--c) 25%,transparent)}
.tutor-card.locked{opacity:.55;cursor:not-allowed}
.topic-row{text-align:center}
.pricing{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,320px));gap:20px;justify-content:center}
.price .amount,.amount{font-size:1.8rem;font-weight:800;color:var(--teal);margin:6px 0}
.price ul{padding-left:20px} .price.best{border:2px solid var(--coral)}
.cta-end{padding:40px 16px}

/* dashboard */
.dash-top{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.goal{text-align:center}
.ring{--p:0;width:76px;height:76px;border-radius:50%;background:conic-gradient(var(--coral) calc(var(--p)*1%),#eadfd3 0);display:grid;place-items:center}
.ring span{background:var(--bg);width:60px;height:60px;border-radius:50%;display:grid;place-items:center;font-weight:700}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin:16px 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;text-align:center}
.stat b{display:block;font-size:1.5rem;color:var(--teal)} .stat span{font-size:.82rem;color:var(--muted)}
.bars{display:flex;align-items:flex-end;gap:4px;height:38px;justify-content:center}
.bars i{width:10px;background:var(--coral);border-radius:3px 3px 0 0}
.filter{margin-bottom:8px}
.cat{color:var(--muted);font-size:.95rem;text-transform:uppercase;letter-spacing:.05em;margin-top:18px}
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.topic{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;font:inherit;cursor:pointer;transition:transform .1s,border-color .15s}
.topic:hover{border-color:var(--coral);transform:translateY(-2px)}
.topic.locked{opacity:.55}
.ticon{font-size:1.6rem} .ttitle{font-weight:600} .tlevel{font-size:.78rem;color:var(--muted)}

/* chat */
body.chatpage .foot{display:none}
body.chatpage main.wrap{padding:0;max-width:820px}
.chat{display:flex;flex-direction:column;height:calc(100dvh - 58px);background:#fff;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.chat-head{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line)}
.chat-head .who{flex:1;display:flex;flex-direction:column;line-height:1.2} .chat-head small{color:var(--muted)}
.back{text-decoration:none;font-size:1.4rem;color:var(--ink)}
.chat-settings{padding:10px 16px;background:#faf7f3;border-bottom:1px solid var(--line);display:grid;gap:6px;font-size:.92rem}
.chat-settings select{max-width:100%}
.chat-body{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:14px;background:linear-gradient(#fff,#fcfaf7)}
.row{display:flex;gap:8px;max-width:88%}
.row.tutor{align-self:flex-start}
.row.me{align-self:flex-end;flex-direction:column;align-items:flex-end}
.row.sys{align-self:center}
.bubble{padding:10px 14px;border-radius:18px;white-space:pre-wrap;word-wrap:break-word}
.row.tutor .bubble{background:#f2ede6;border-bottom-left-radius:4px}
.row.me .bubble{background:var(--c,var(--coral));color:#fff;border-bottom-right-radius:4px}
.tools{display:flex;gap:6px;margin-top:4px}
.trans{margin-top:6px;padding:8px 12px;background:#eef6f6;border-radius:12px;font-size:.92rem}
.fb{background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 12px;font-size:.9rem;max-width:100%;display:flex;flex-direction:column;gap:4px}
.nofix .fb{display:none}
.fb-ok{color:var(--ok);font-weight:600}
.fb-line ins,.fb-why ins,.demo-fix ins{background:#d8f3e3;color:#0d5c36;text-decoration:none;border-radius:4px;padding:0 3px}
.fb-line s,.fb-why s,.demo-fix s{color:var(--bad)}
.fb-vocab{display:flex;flex-wrap:wrap;gap:6px}
.vchip{background:#fff7e6;border:1px solid #f1d9a8;border-radius:10px;padding:4px 10px;font:inherit;font-size:.85rem;cursor:pointer;text-align:left}
.vchip small{color:var(--muted)} .vchip.saved{background:#fde9b8}
.clarity{font-size:.78rem;font-weight:600;border-radius:999px;padding:1px 8px;align-self:flex-start}
.clarity.good{background:#d8f3e3;color:#0d5c36} .clarity.mid{background:#fdf0d5;color:var(--warn)} .clarity.low{background:#fdecea;color:var(--bad)}
.dots{display:flex;gap:4px;padding:14px 16px}
.dots i{width:7px;height:7px;border-radius:50%;background:#a9a39b;animation:b 1s infinite}
.dots i:nth-child(2){animation-delay:.15s}.dots i:nth-child(3){animation-delay:.3s}
@keyframes b{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-6px)}}
.hint-box{padding:10px 14px;border-top:1px solid var(--line);background:#fffaf0;display:flex;flex-direction:column;gap:6px}
.idea{text-align:left;background:#fff;border:1px solid #f1d9a8;border-radius:12px;padding:8px 12px;font:inherit;cursor:pointer}
.chat-foot{display:flex;align-items:center;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line)}
.textform{flex:1;display:flex;align-items:center;background:#f5f1ec;border-radius:999px;padding:2px 4px 2px 14px}
.textform input{flex:1;border:0;background:transparent;font:inherit;padding:10px 0;outline:none;min-width:0}
.mic{width:62px;height:62px;border-radius:50%;border:0;background:var(--c,var(--coral));color:#fff;font-size:1.6rem;cursor:pointer;flex:none;box-shadow:0 4px 14px #0002;transition:transform .1s}
.mic.on{animation:pulse 1.2s infinite;background:var(--bad)}
.mic.off{opacity:.45}
@keyframes pulse{0%{box-shadow:0 0 0 0 #c2413a88}70%{box-shadow:0 0 0 16px #c2413a00}100%{box-shadow:0 0 0 0 #c2413a00}}
.mic-status{text-align:center;font-size:.85rem;color:var(--muted);min-height:1.2em;padding-bottom:6px}

/* report */
.report-head{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.score-big{font-size:3.2rem;font-weight:800;color:var(--coral);line-height:1}
.score-big small{font-size:1rem;color:var(--muted)}
.meter{display:grid;grid-template-columns:90px 1fr 36px;gap:10px;align-items:center;margin:8px 0}
.meter div{background:#eee6dc;border-radius:999px;height:10px;overflow:hidden}
.meter i{display:block;height:100%;background:linear-gradient(90deg,var(--coral),#f0a35b)}
.tip{background:#eef6f6;border-radius:10px;padding:10px 14px;margin-top:10px}
.ok-text{color:var(--ok)}

/* lists, tables, tabs */
.list{display:flex;flex-direction:column;gap:8px}
.list-item{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px;text-decoration:none;color:inherit}
.list-item.done{opacity:.6}
.grow{flex:1}
.score{font-size:1.4rem;font-weight:800;color:var(--coral)}
.flashcard{text-align:center}
.fc{perspective:800px;height:180px;cursor:pointer;margin:0 auto 10px;max-width:420px;position:relative}
.fc>div{position:absolute;inset:0;display:grid;place-items:center;border-radius:16px;font-size:1.6rem;font-weight:700;backface-visibility:hidden;transition:transform .45s;padding:16px}
.fc .front{background:var(--teal);color:#fff}
.fc .back{background:#fff7e6;transform:rotateY(180deg);font-size:1.15rem;font-weight:500}
.fc.flip .front{transform:rotateY(180deg)} .fc.flip .back{transform:rotateY(360deg)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.tabs a{padding:8px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink)}
.tabs a.on{background:var(--teal);color:#fff}
.tbl-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;background:#fff}
.tbl th,.tbl td{padding:10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
form.inline{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
form.inline select,form.inline input{padding:5px;border:1px solid var(--line);border-radius:8px;font:inherit}
.searchbar{display:flex;gap:8px;margin-bottom:12px}
.searchbar input{margin:0}
details summary{cursor:pointer}
details .form{margin-top:14px}

@media (max-width:760px){
  .hero{grid-template-columns:1fr;padding:36px 16px}
  .topbar nav{gap:10px;font-size:.92rem}
  .chat{height:calc(100dvh - 96px);border:0}
  .row{max-width:94%}
}
[hidden]{display:none!important}
.textform{min-width:0}
@media (max-width:760px){.mic{width:54px;height:54px}.topbar{padding:8px 12px}.topbar nav{font-size:.85rem;gap:8px}}
@media (max-width:760px){
  .tutor-row.pick{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:6px}
  .tutor-row.pick .tutor-card{flex:0 0 150px;scroll-snap-align:start;padding:12px}
  .topic-grid{grid-template-columns:1fr 1fr;gap:8px}
  .topic{padding:10px}
  .stats{grid-template-columns:repeat(3,1fr)}
  .stat{padding:10px} .stat b{font-size:1.2rem}
}