:root{
  --bg:#eef4f1;--card:#ffffff;--text:#193026;--muted:#6d7c73;--line:#dde5df;
  --primary:#1f6a46;--primary-2:#2d8a5e;--primary-3:#49b07b;--accent:#f6b534;--accent-2:#ff8a3d;
  --soft:#e9f4ed;--soft-2:#fdf6e6;--danger:#b74141;
  --shadow:0 14px 35px rgba(24,55,40,.08);--radius:22px;
}
*{box-sizing:border-box} body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
body.dark{--bg:#0f1713;--card:#17211c;--text:#edf7f0;--muted:#9aaca1;--line:#2b3931;--soft:#1b3125;--soft-2:#392f1e;--shadow:0 14px 35px rgba(0,0,0,.25)}
button,input{font:inherit}.app-shell{max-width:1180px;margin:0 auto;padding:22px}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;padding:6px 4px}.brand{display:flex;gap:12px;align-items:center}.logo,.avatar{display:grid;place-items:center;border-radius:16px;background:var(--soft)}.logo{width:52px;height:52px;font-size:28px}.brand h1{font-size:22px;margin:0}.brand p,.robot-head p{margin:3px 0 0;color:var(--muted);font-size:13px}.top-actions{display:flex;gap:8px}.icon-btn{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;width:42px;height:42px;cursor:pointer}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero{padding:30px;display:grid;grid-template-columns:1.3fr .9fr;gap:22px;align-items:stretch;background:linear-gradient(135deg,color-mix(in srgb,var(--soft) 70%,white),var(--card))}.hero h2{font-size:32px;line-height:1.1;margin:8px 0 10px;max-width:720px}.hero p{margin:0;color:var(--muted);max-width:700px}.hero-copy{display:flex;flex-direction:column;justify-content:center}.hero-side{display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:stretch}.hero-tip{margin-top:16px;padding:12px 14px;border-radius:14px;background:var(--soft-2);border:1px solid color-mix(in srgb,var(--accent) 20%,var(--line));font-size:13px;line-height:1.45}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.12em;color:var(--primary-2)}.hero-score{text-align:center;min-width:120px;display:flex;flex-direction:column;justify-content:center;padding:14px;background:var(--card);border:1px solid var(--line);border-radius:18px}.ring{width:92px;height:92px;border-radius:50%;display:grid;place-items:center;margin:0 auto 6px;background:conic-gradient(var(--primary) 0deg,#dbe5de 0deg);position:relative}.ring:after{content:"";position:absolute;inset:9px;border-radius:50%;background:var(--card)}.ring span{position:relative;z-index:1;font-size:19px;font-weight:800}.hero-score small{color:var(--muted)}.level-card{padding:15px;border-radius:18px;background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 10%,var(--card)),color-mix(in srgb,var(--accent) 8%,var(--card)));border:1px solid var(--line);display:flex;flex-direction:column;justify-content:center}.level-top{display:flex;justify-content:space-between;gap:8px;align-items:center;margin-bottom:8px}.level-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;background:var(--soft);color:var(--primary-2);font-size:11px;font-weight:900}.level-rank{font-size:12px;color:var(--muted);font-weight:700;text-align:right}.xp-track{margin:10px 0 8px}.xp-track .mini-fill{background:linear-gradient(90deg,var(--primary),var(--accent-2))}
.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin:14px 0}.stat{padding:16px;display:flex;align-items:center;gap:12px;background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--soft) 35%,var(--card)))}.stat-icon{font-size:24px;width:46px;height:46px;display:grid;place-items:center;border-radius:14px;background:var(--soft)}.stat b{font-size:22px;display:block}.stat small{color:var(--muted)}
.robot-panel{padding:22px;margin-bottom:14px}.robot-head{display:flex;gap:12px;align-items:center;margin-bottom:18px}.avatar{width:52px;height:52px;font-size:27px}.robot-head h3{margin:0}.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.mode-btn{display:flex;flex-direction:column;gap:5px;text-align:left;padding:18px;border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:18px;cursor:pointer;transition:.18s;min-height:124px;justify-content:flex-start}.mode-btn:hover{transform:translateY(-2px);border-color:var(--primary-2);box-shadow:0 10px 24px rgba(25,48,38,.08)}.mode-btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:white;border:0}.learn-btn{background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 10%,white),var(--card))}.wrong-btn{background:linear-gradient(135deg,#fff6ea,var(--card))}.quick-btn{background:linear-gradient(135deg,#edf7ff,var(--card))}.hard-btn{background:linear-gradient(135deg,#f4edff,var(--card))}.units-btn{background:linear-gradient(135deg,#eefbf3,var(--card))}.mode-btn span{font-size:24px}.mode-btn b{font-size:16px}.mode-btn small{color:var(--muted);line-height:1.4}.mode-btn.primary small{color:#d8ede1}
.session-progress-row{display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.progress-track{height:8px;background:var(--soft);border-radius:99px;overflow:hidden;margin:8px 0 18px}.progress-fill{height:100%;width:0;background:var(--primary);transition:.25s}.chat{min-height:180px;display:flex;flex-direction:column;gap:10px;padding:4px 0 12px}.bubble{max-width:82%;padding:13px 15px;border-radius:16px;line-height:1.45}.bubble.bot{background:var(--soft);align-self:flex-start;border-bottom-left-radius:5px}.bubble.user{background:var(--primary);color:#fff;align-self:flex-end;border-bottom-right-radius:5px}.bubble.correct{border:1px solid #54a974}.bubble.wrong{border:1px solid #d46a6a}.big-word{font-size:27px;font-weight:800;display:block;margin-bottom:4px}.meaning{color:var(--muted)}.example{margin-top:9px;font-size:13px;color:var(--muted);font-style:italic}.answer-form{display:flex;gap:8px}.answer-form input{flex:1;border:1px solid var(--line);background:var(--bg);color:var(--text);padding:13px 14px;border-radius:12px;outline:none}.answer-form input:focus{border-color:var(--primary)}.submit-btn,.next-btn,.secondary-btn,.danger-btn,.text-btn{cursor:pointer;border-radius:12px;padding:12px 15px}.submit-btn,.next-btn{border:0;background:var(--primary);color:white;font-weight:700}.next-btn{width:100%}.choices{display:grid;grid-template-columns:1fr 1fr;gap:9px}.choice{padding:13px;border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;text-align:left;cursor:pointer}.choice:hover{border-color:var(--primary)}.choice.correct-choice{background:#e5f5ea;border-color:#58a873;color:#214f33}.choice.wrong-choice{background:#fdeaea;border-color:#d16c6c;color:#6b2e2e}.hint-row{display:flex;justify-content:space-between;align-items:center;margin-top:9px}.text-btn{border:0;background:transparent;color:var(--primary-2);padding:7px 2px}.speak-btn{border:0;background:transparent;cursor:pointer;font-size:20px}
.mission-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:14px;margin-bottom:14px}.mission-grid>.card,.grid-2>.card,.tools-card,.explain-card{padding:20px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}.section-head{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:14px}.section-head h3{margin:4px 0 0}.week-plan{display:flex;flex-direction:column;gap:8px}.day-row{display:grid;grid-template-columns:56px 1fr auto;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:13px}.day-row.current{background:var(--soft);border-color:var(--primary-2)}.day-num{font-weight:800}.day-units{font-size:13px}.day-units small{display:block;color:var(--muted);margin-top:2px}.badge{font-size:11px;padding:5px 8px;border-radius:99px;background:var(--soft);color:var(--primary-2);font-weight:700}.unit-progress{display:flex;flex-direction:column;gap:10px}.unit-row{display:grid;grid-template-columns:1fr 110px 44px;gap:8px;align-items:center}.unit-row small{color:var(--muted)}.mini-track{height:7px;background:var(--soft);border-radius:99px;overflow:hidden}.mini-fill{height:100%;background:var(--primary);border-radius:99px}.unit-pct{text-align:right;font-size:12px;color:var(--muted)}.tools-card{margin-top:14px;margin-bottom:30px}.tool-row{display:flex;flex-wrap:wrap;gap:9px}.secondary-btn,.danger-btn{border:1px solid var(--line);background:var(--card);color:var(--text)}.danger-btn{color:var(--danger)}.file-btn input{display:none}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:grid;place-items:center;padding:20px;z-index:50}.modal-card{width:min(680px,100%);max-height:80vh;overflow:auto;background:var(--card);border-radius:20px;padding:20px}.unit-buttons{display:grid;grid-template-columns:1fr 1fr;gap:9px}.unit-select-btn{padding:14px;border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:13px;text-align:left;cursor:pointer}.unit-select-btn b{display:block}.unit-select-btn small{color:var(--muted)}.toast{position:fixed;right:18px;bottom:18px;background:#17281f;color:white;padding:11px 14px;border-radius:12px;opacity:0;transform:translateY(10px);pointer-events:none;transition:.2s;z-index:90}.toast.show{opacity:1;transform:translateY(0)}.hidden{display:none!important}.session-summary{text-align:center;padding:20px}.session-summary .score-big{font-size:44px;font-weight:900}.session-summary p{color:var(--muted)}
@media(max-width:850px){.stats-grid{grid-template-columns:1fr 1fr}.mode-grid{grid-template-columns:1fr 1fr}.grid-2{grid-template-columns:1fr}.hero h2{font-size:25px}}
@media(max-width:560px){.app-shell{padding:12px}.hero{padding:20px;align-items:flex-start}.hero-score{display:none}.stats-grid{gap:8px}.stat{padding:12px}.mode-grid{grid-template-columns:1fr}.choices{grid-template-columns:1fr}.unit-buttons{grid-template-columns:1fr}.unit-row{grid-template-columns:1fr 80px 38px}.brand p{display:none}.bubble{max-width:94%}}

/* Cloud account / authentication */
.auth-gate{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at top,#e5f1e9 0,var(--bg) 46%)}
body.dark .auth-gate{background:radial-gradient(circle at top,#173225 0,var(--bg) 46%)}
.auth-card{width:min(470px,100%);padding:26px}
.auth-brand{display:flex;gap:14px;align-items:flex-start;margin-bottom:22px}.auth-brand h1{margin:4px 0 6px;font-size:28px}.auth-brand p{margin:0;color:var(--muted);line-height:1.5}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--soft);padding:4px;border-radius:13px;margin-bottom:18px}.auth-tab{border:0;background:transparent;color:var(--muted);padding:10px;border-radius:10px;font-weight:800;cursor:pointer}.auth-tab.active{background:var(--card);color:var(--text);box-shadow:0 4px 16px rgba(0,0,0,.06)}
.auth-form{display:flex;flex-direction:column;gap:12px}.field{display:flex;flex-direction:column;gap:6px}.field span{font-size:12px;font-weight:800;color:var(--muted)}.field input{width:100%;border:1px solid var(--line);background:var(--bg);color:var(--text);padding:13px 14px;border-radius:12px;outline:none}.field input:focus{border-color:var(--primary-2);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 12%,transparent)}
.auth-submit{width:100%;margin-top:4px}.auth-reset{width:100%;text-align:center;margin-top:5px}.auth-divider{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px;margin:6px 0}.auth-divider:before,.auth-divider:after{content:"";height:1px;background:var(--line);flex:1}.guest-btn{width:100%}.auth-note{font-size:12px;line-height:1.45;color:var(--muted);text-align:center;margin:10px 0 0}.setup-message{margin-top:14px;padding:11px 12px;border-radius:12px;background:#fff1f1;border:1px solid #efb7b7;color:#7a3333;font-size:12px;line-height:1.45}.setup-message.success{background:var(--soft);border-color:var(--line);color:var(--primary-2)}
.user-chip{display:flex;align-items:center;gap:8px;padding:5px 10px 5px 6px;border:1px solid var(--line);border-radius:13px;background:var(--card);min-width:150px}.user-avatar{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;background:var(--soft)}.user-chip b,.user-chip small{display:block;max-width:135px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-chip b{font-size:12px}.user-chip small{font-size:10px;color:var(--muted);margin-top:1px}
.cloud-badge{font-size:11px;font-weight:800;padding:6px 9px;border-radius:99px;background:var(--soft);color:var(--primary-2)}.tools-note{margin:12px 0 0;font-size:12px;color:var(--muted);line-height:1.45}
button:disabled{opacity:.55;cursor:not-allowed;transform:none!important}
.stats-grid{grid-template-columns:repeat(5,1fr)}
@media(max-width:950px){.stats-grid{grid-template-columns:repeat(3,1fr)}.user-chip{min-width:0}.user-chip div{display:none}}
@media(max-width:620px){.auth-gate{padding:12px}.auth-card{padding:20px}.auth-brand h1{font-size:24px}.stats-grid{grid-template-columns:1fr 1fr}.top-actions{gap:5px}.user-chip{padding:5px}.user-chip .user-avatar{width:30px;height:30px}.topbar{align-items:flex-start}.brand h1{font-size:18px}.icon-btn{width:38px;height:38px}}

.compact-head{margin-bottom:12px}.badge-gold{background:var(--soft-2)!important;color:#8b5b00!important}.mission-list{display:flex;flex-direction:column;gap:10px}.mission-item{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--soft) 28%,var(--card)))}.mission-icon{width:38px;height:38px;border-radius:12px;background:var(--soft);display:grid;place-items:center;font-size:20px}.mission-title{font-weight:800}.mission-desc{font-size:12px;color:var(--muted);margin-top:2px}.mission-meta{display:flex;flex-direction:column;align-items:flex-end;gap:6px}.mission-pct{font-size:12px;font-weight:800;color:var(--primary-2)}.mission-mini{width:80px}.focus-words{display:flex;flex-direction:column;gap:10px}.focus-item{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;padding:12px 14px;border-radius:15px;border:1px solid var(--line);background:linear-gradient(180deg,var(--card),color-mix(in srgb,#fff1dc 55%,var(--card)))}.focus-main b{display:block}.focus-main small{display:block;color:var(--muted);margin-top:3px}.chip-alert,.chip-ok,.chip-neutral{font-size:11px;padding:6px 8px;border-radius:999px;font-weight:800}.chip-alert{background:#fff0ef;color:#b04a46}.chip-ok{background:#e9f7ef;color:#26784a}.chip-neutral{background:var(--soft);color:var(--primary-2)}.badges-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.badge-card{padding:12px;border-radius:16px;border:1px solid var(--line);background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--soft) 26%,var(--card)));display:flex;gap:10px;align-items:flex-start}.badge-card.locked{opacity:.55;filter:saturate(.8)}.badge-icon{width:40px;height:40px;border-radius:13px;display:grid;place-items:center;background:var(--soft-2);font-size:20px;flex:none}.badge-card b{display:block;font-size:14px}.badge-card small{display:block;color:var(--muted);line-height:1.35;margin-top:3px}.explain-card{margin-top:14px;margin-bottom:14px}.explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.explain-step{padding:16px;border:1px dashed var(--line);border-radius:18px;background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--soft) 20%,var(--card)))}.explain-step span{width:34px;height:34px;border-radius:11px;background:var(--soft);display:grid;place-items:center;font-weight:900;color:var(--primary-2);margin-bottom:10px}.explain-step b{display:block;margin-bottom:5px}.explain-step small{color:var(--muted);line-height:1.45}.section-head h3{margin:4px 0 0}.session-area{padding:4px 2px}.bubble{box-shadow:0 8px 18px rgba(25,48,38,.05)}

@media(max-width:1050px){.mission-grid{grid-template-columns:1fr 1fr}.badges-card{grid-column:1/-1}.hero{grid-template-columns:1fr}.hero-side{grid-template-columns:120px 1fr}}
@media(max-width:850px){.stats-grid{grid-template-columns:1fr 1fr}.mode-grid{grid-template-columns:1fr 1fr}.grid-2{grid-template-columns:1fr}.mission-grid{grid-template-columns:1fr}.hero h2{font-size:25px}.explain-grid{grid-template-columns:1fr}}
@media(max-width:620px){.hero{padding:20px}.hero-side{grid-template-columns:1fr}.hero-score{order:2}.level-card{order:1}.stats-grid{grid-template-columns:1fr 1fr}.mission-grid>.card,.grid-2>.card,.tools-card,.explain-card,.robot-panel{padding:16px}.badges-grid{grid-template-columns:1fr}.mission-item{grid-template-columns:auto 1fr}.mission-meta{grid-column:1/-1;align-items:flex-start}.focus-item{grid-template-columns:1fr}.topbar{align-items:flex-start;gap:10px}.brand h1{font-size:18px}.icon-btn{width:38px;height:38px}}