:root{
  --ink:#232946;
  --ink-soft:#5a5f85;
  --primary:#5b6cff;
  --primary-deep:#4051e8;
  --coral:#ff7f66;
  --sun:#ffc94d;
  --mint:#3fc1a8;
  --lav:#b9a8ff;
  --card:#ffffff;
  --bg:#f7f9ff;
  --good:#2fbf8f;
  --bad:#ff5d73;
  --radius:20px;
  --shadow:0 10px 30px rgba(35,41,70,.10);
  --shadow-sm:0 4px 14px rgba(35,41,70,.08);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:'Rubik',sans-serif;
  background:var(--bg);
  color:var(--ink);
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,.headline{font-family:'Fredoka','Rubik',sans-serif;font-weight:600;letter-spacing:.2px}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea,select{font-family:inherit}

/* background blobs */
.bg-blobs{position:fixed;inset:0;z-index:-1;overflow:hidden}
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;animation:drift 26s ease-in-out infinite alternate}
.b1{width:46vw;height:46vw;background:#dfe5ff;top:-12vw;right:-10vw}
.b2{width:38vw;height:38vw;background:#ffe9d9;bottom:-8vw;left:-8vw;animation-delay:-8s}
.b3{width:30vw;height:30vw;background:#dff7ef;top:38%;left:22%;animation-delay:-16s}
@keyframes drift{from{transform:translate(0,0) scale(1)}to{transform:translate(4vw,3vh) scale(1.12)}}

/* layout */
.page{max-width:860px;margin:0 auto;padding:18px 16px 90px}
.topbar{display:flex;align-items:center;gap:12px;padding:6px 2px 18px}
.topbar .grow{flex:1}
.logo-badge{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,var(--primary),var(--lav));display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);flex:none}
.logo-badge svg{width:32px;height:32px}
.app-name{font-family:'Fredoka';font-size:1.5rem;font-weight:700;color:var(--ink)}
.app-tag{font-size:.85rem;color:var(--ink-soft)}

.hero{text-align:center;padding:22px 16px 26px;position:relative}
.hero h1{font-size:2.3rem;margin:.2em 0 .15em;color:var(--ink)}
.hero h1 .hl{color:var(--primary);position:relative}
.hero p{color:var(--ink-soft);max-width:520px;margin:0 auto;line-height:1.7}
.hero .spark{position:absolute;animation:float 5s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0) rotate(-6deg)}50%{transform:translateY(-12px) rotate(6deg)}}

/* cards */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:18px;transition:transform .18s ease, box-shadow .18s ease}
.card.tappable:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card.tappable:active{transform:scale(.985)}
.grid{display:grid;gap:14px}
@media(min-width:620px){.grid.cols2{grid-template-columns:1fr 1fr}}

.unit-card{display:flex;gap:14px;align-items:flex-start;cursor:pointer}
.unit-icon{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.7rem;flex:none;background:linear-gradient(135deg,#eef1ff,#e6fbf4)}
.unit-card h3{margin:0 0 4px;font-size:1.15rem}
.unit-card .meta{font-size:.8rem;color:var(--ink-soft);display:flex;gap:8px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:4px;background:#eef1ff;color:var(--primary-deep);border-radius:999px;padding:3px 10px;font-size:.75rem;font-weight:500}
.chip.green{background:#e3f8f0;color:#0d7a5c}
.chip.orange{background:#fff0e8;color:#c65a3e}

.new-card{border:2px dashed #c3caff;background:linear-gradient(135deg,#f4f6ff,#f2fdf9);text-align:center;padding:26px 16px;cursor:pointer}
.new-card .plus{width:58px;height:58px;margin:0 auto 10px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--mint));color:#fff;font-size:2rem;display:flex;align-items:center;justify-content:center;font-family:'Fredoka';box-shadow:var(--shadow-sm)}
.new-card h3{margin:0 0 4px}
.new-card p{margin:0;color:var(--ink-soft);font-size:.85rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;padding:12px 26px;font-weight:600;font-size:1rem;transition:transform .15s ease, box-shadow .15s ease, filter .15s;text-decoration:none}
.btn:active{transform:scale(.96)}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;box-shadow:0 8px 20px rgba(91,108,255,.35)}
.btn.primary:hover{filter:brightness(1.06)}
.btn.soft{background:#eef1ff;color:var(--primary-deep)}
.btn.ghost{background:#fff;color:var(--ink);box-shadow:var(--shadow-sm)}
.btn.danger-soft{background:#ffeef0;color:#c73a54}
.btn.big{width:100%;padding:15px;font-size:1.1rem}
.btn[disabled]{opacity:.5;pointer-events:none}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}

/* forms */
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}
.field .hint{font-weight:400;font-size:.78rem;color:var(--ink-soft)}
textarea,input[type=text],input[type=password],select{
  width:100%;border:2px solid #e3e7fb;border-radius:14px;padding:12px 14px;font-size:1rem;background:#fbfcff;color:var(--ink);outline:none;transition:border-color .15s;
}
textarea:focus,input:focus,select:focus{border-color:var(--primary)}
textarea{min-height:170px;resize:vertical;line-height:1.7}
.toggle-row{display:flex;align-items:center;gap:10px;background:#fff;border-radius:14px;padding:12px 14px;box-shadow:var(--shadow-sm);margin-bottom:16px}
.toggle-row .grow{flex:1}
.switch{position:relative;width:48px;height:28px;border-radius:999px;background:#dfe3f5;transition:background .2s;flex:none}
.switch.on{background:var(--mint)}
.switch::after{content:'';position:absolute;top:3px;right:3px;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.2);transition:transform .2s}
.switch.on::after{transform:translateX(-20px)}

.engine-banner{display:flex;gap:10px;align-items:center;border-radius:14px;padding:12px 14px;font-size:.85rem;margin-bottom:16px;line-height:1.5}
.engine-banner.free{background:#fff8e6;border:1.5px solid #ffe3a1}
.engine-banner.pro{background:#eafaf3;border:1.5px solid #a9e8cf}

/* progress */
.gen-steps{display:flex;flex-direction:column;gap:10px;margin:22px 0}
.gen-step{display:flex;align-items:center;gap:12px;background:#fff;border-radius:14px;padding:12px 16px;box-shadow:var(--shadow-sm);opacity:.35;transition:opacity .3s}
.gen-step.active{opacity:1}
.gen-step.done{opacity:1}
.gen-step .dot{width:26px;height:26px;border-radius:50%;background:#eef1ff;display:flex;align-items:center;justify-content:center;font-size:.9rem;flex:none}
.gen-step.active .dot{background:var(--primary);color:#fff;animation:pulse 1.1s ease-in-out infinite}
.gen-step.done .dot{background:var(--good);color:#fff;animation:none}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.18)}}

/* unit view */
.tabs{display:flex;gap:8px;background:#fff;padding:6px;border-radius:999px;box-shadow:var(--shadow-sm);margin:14px 0 20px;position:sticky;top:10px;z-index:5}
.tabs button{flex:1;padding:10px 6px;border-radius:999px;font-weight:600;font-size:.95rem;color:var(--ink-soft);transition:all .18s}
.tabs button.on{background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;box-shadow:0 6px 14px rgba(91,108,255,.3)}

.chapter-card{margin-bottom:14px}
.chapter-card h3{margin:0 0 6px;display:flex;align-items:center;gap:10px}
.chapter-num{width:34px;height:34px;border-radius:12px;background:linear-gradient(135deg,var(--sun),var(--coral));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-family:'Fredoka';font-weight:700;font-size:1.05rem;flex:none}
.chapter-card .summary{color:var(--ink);line-height:1.85;margin:6px 0 12px}
.keypoints{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:7px}
.keypoints li{display:flex;gap:9px;align-items:flex-start;font-size:.92rem;line-height:1.6;color:var(--ink)}
.keypoints li::before{content:'★';color:var(--sun);font-size:.8rem;margin-top:3px;flex:none}
.src-note{font-size:.78rem;color:var(--ink-soft);background:#f4f6ff;border-radius:12px;padding:10px 12px;line-height:1.6;margin:14px 0}
.src-note a{color:var(--primary-deep)}
.ch-link{font-size:.8rem;color:var(--primary-deep);text-decoration:none;font-weight:500}

.tip-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}
.tip-list li{background:#fff;border-radius:16px;box-shadow:var(--shadow-sm);padding:14px 16px;display:flex;gap:12px;align-items:flex-start;line-height:1.7}
.tip-list li .bulb{width:34px;height:34px;border-radius:50%;background:#fff6dd;display:flex;align-items:center;justify-content:center;flex:none;font-size:1.1rem}

/* games menu */
.game-card{display:flex;align-items:center;gap:14px;cursor:pointer;margin-bottom:12px}
.game-card .gicon{width:56px;height:56px;border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;flex:none;box-shadow:var(--shadow-sm)}
.game-card h3{margin:0 0 3px}
.game-card p{margin:0;font-size:.8rem;color:var(--ink-soft)}
.stars{color:var(--sun);font-size:1rem;letter-spacing:2px}
.stars .off{color:#e3e7fb}

/* overlay (games + video + settings) */
.overlay{position:fixed;inset:0;background:var(--bg);z-index:50;display:flex;flex-direction:column;animation:slideUp .3s ease}
@keyframes slideUp{from{transform:translateY(40px);opacity:0}to{transform:none;opacity:1}}
.overlay-head{display:flex;align-items:center;gap:12px;padding:14px 16px;background:rgba(255,255,255,.8);backdrop-filter:blur(8px);box-shadow:var(--shadow-sm)}
.overlay-head h2{margin:0;font-size:1.15rem;flex:1}
.icon-btn{width:40px;height:40px;border-radius:12px;background:#eef1ff;color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex:none}
.overlay-body{flex:1;overflow-y:auto;padding:18px 16px 40px;max-width:860px;width:100%;margin:0 auto}

.score-bar{display:flex;gap:10px;justify-content:center;margin-bottom:16px;flex-wrap:wrap}
.score-pill{background:#fff;border-radius:999px;padding:7px 16px;box-shadow:var(--shadow-sm);font-size:.85rem;font-weight:600}
.score-pill b{color:var(--primary-deep)}

/* memory game */
.mem-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:520px;margin:0 auto}
@media(min-width:620px){.mem-grid{grid-template-columns:repeat(4,1fr)}}
.mem-card{aspect-ratio:3/3.6;perspective:700px;cursor:pointer}
.mem-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.8,.3,1.2)}
.mem-card.open .mem-inner{transform:rotateY(180deg)}
.mem-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:16px;display:flex;align-items:center;justify-content:center;padding:8px;text-align:center}
.mem-front{background:linear-gradient(135deg,var(--primary),var(--lav));box-shadow:var(--shadow-sm)}
.mem-front svg{width:44%;height:44%;opacity:.9}
.mem-back{background:#fff;transform:rotateY(180deg);font-size:.8rem;font-weight:600;line-height:1.45;box-shadow:var(--shadow-sm);overflow:hidden}
.mem-card.matched .mem-back{background:#e3f8f0;outline:3px solid var(--mint)}
.mem-card.wiggle .mem-inner{animation:wiggle .35s ease}
@keyframes wiggle{0%,100%{transform:rotateY(180deg) translateX(0)}25%{transform:rotateY(180deg) translateX(-6px)}75%{transform:rotateY(180deg) translateX(6px)}}

/* timeline game */
.tl-pool{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:20px;min-height:52px}
.tl-chip{background:#fff;border-radius:999px;padding:9px 16px;box-shadow:var(--shadow-sm);font-size:.88rem;font-weight:500;cursor:pointer;transition:transform .15s;line-height:1.4;max-width:100%}
.tl-chip:active{transform:scale(.94)}
.tl-answer{display:flex;flex-direction:column;gap:8px;max-width:620px;margin:0 auto}
.tl-slot{display:flex;gap:10px;align-items:center;background:#fff;border-radius:14px;padding:10px 12px;box-shadow:var(--shadow-sm);min-height:52px}
.tl-slot .n{width:28px;height:28px;border-radius:50%;background:#eef1ff;color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;flex:none;font-family:'Fredoka'}
.tl-slot.empty .ph{color:#b6bcd9;font-size:.85rem}
.tl-slot.good{outline:3px solid var(--good);background:#f0fcf7}
.tl-slot.bad{outline:3px solid var(--bad);background:#fff4f5;animation:wiggle2 .3s ease}
@keyframes wiggle2{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}

/* blanks game */
.blank-stage{max-width:620px;margin:0 auto;text-align:center}
.blank-sentence{background:#fff;border-radius:20px;box-shadow:var(--shadow-sm);padding:26px 20px;font-size:1.25rem;line-height:2;margin-bottom:24px;font-weight:500}
.blank-hole{display:inline-block;min-width:90px;border-bottom:3px dashed var(--primary);color:var(--primary-deep);font-weight:700;padding:0 8px;border-radius:6px}
.blank-hole.ok{border-bottom-color:var(--good);color:var(--good)}
.blank-hole.err{border-bottom-color:var(--bad);color:var(--bad);animation:wiggle2 .3s ease}
.word-bank{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.word-chip{background:linear-gradient(135deg,#fff,#f4f6ff);border:2px solid #dfe4fb;border-radius:999px;padding:11px 22px;font-size:1.05rem;font-weight:600;box-shadow:var(--shadow-sm);cursor:pointer;transition:transform .15s}
.word-chip:active{transform:scale(.93)}
.blank-progress{display:flex;gap:6px;justify-content:center;margin-bottom:18px}
.blank-progress i{width:10px;height:10px;border-radius:50%;background:#e3e7fb}
.blank-progress i.done{background:var(--good)}
.blank-progress i.now{background:var(--primary);animation:pulse 1s infinite}

/* result screen */
.result{max-width:460px;margin:40px auto;text-align:center;background:#fff;border-radius:26px;box-shadow:var(--shadow);padding:34px 24px}
.result .big-stars{font-size:3rem;letter-spacing:8px;color:var(--sun);margin:8px 0}
.result .big-stars .off{color:#e3e7fb}
.result h2{margin:6px 0}
.result p{color:var(--ink-soft)}

/* video */
.video-stage{position:relative;width:100%;aspect-ratio:16/9;border-radius:22px;overflow:hidden;background:#1b1e33;box-shadow:var(--shadow)}
.video-stage img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;animation:kenburns 14s ease-in-out infinite alternate}
@keyframes kenburns{from{transform:scale(1.02) translate(0,0)}to{transform:scale(1.16) translate(-2.5%,-2%)}}
.video-stage .scrim{position:absolute;inset:0;background:linear-gradient(to top,rgba(20,22,44,.72) 0%,rgba(20,22,44,.05) 45%)}
.video-caption{position:absolute;bottom:0;right:0;left:0;padding:18px 20px 22px;color:#fff;font-size:1.02rem;line-height:1.8;font-weight:500;text-shadow:0 2px 8px rgba(0,0,0,.4)}
.video-caption .w{opacity:0;display:inline-block;animation:wordIn .3s forwards}
@keyframes wordIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.video-scene-title{position:absolute;top:14px;right:16px;background:rgba(20,22,44,.55);backdrop-filter:blur(4px);color:#fff;border-radius:999px;padding:6px 16px;font-size:.85rem;font-weight:600}
.video-sparkle{position:absolute;color:rgba(255,255,255,.85);font-size:1.1rem;animation:float 4s ease-in-out infinite;pointer-events:none}
.video-controls{display:flex;align-items:center;gap:10px;margin-top:14px}
.video-track{flex:1;height:8px;border-radius:999px;background:#e3e7fb;overflow:hidden;cursor:pointer}
.video-track i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--mint));border-radius:999px;transition:width .3s linear}
.video-dots{display:flex;gap:6px;justify-content:center;margin-top:12px;flex-wrap:wrap}
.video-dots i{width:9px;height:9px;border-radius:50%;background:#dfe3f5;cursor:pointer}
.video-dots i.on{background:var(--primary);transform:scale(1.25)}
.scene-row{display:flex;gap:12px;align-items:center;background:#fff;border-radius:16px;box-shadow:var(--shadow-sm);padding:12px;margin-bottom:10px}
.scene-row img{width:92px;height:56px;object-fit:cover;border-radius:10px;flex:none;background:#eef1ff}
.scene-row .n{width:30px;height:30px;border-radius:50%;background:#eef1ff;color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-weight:700;flex:none;font-family:'Fredoka'}
.scene-row h4{margin:0 0 2px;font-size:.95rem}
.scene-row p{margin:0;font-size:.78rem;color:var(--ink-soft);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* settings */
.set-row{background:#fff;border-radius:16px;box-shadow:var(--shadow-sm);padding:16px;margin-bottom:12px}
.set-row h3{margin:0 0 6px;font-size:1rem}
.set-row p{font-size:.82rem;color:var(--ink-soft);line-height:1.6;margin:0 0 10px}
.set-row a{color:var(--primary-deep)}

/* misc */
.empty-state{text-align:center;padding:50px 20px;color:var(--ink-soft)}
.toast{position:fixed;bottom:26px;right:50%;transform:translateX(50%);background:var(--ink);color:#fff;border-radius:999px;padding:11px 22px;font-size:.88rem;box-shadow:var(--shadow);z-index:99;animation:toastIn .25s ease;max-width:88vw;text-align:center}
@keyframes toastIn{from{opacity:0;transform:translate(50%,12px)}to{opacity:1;transform:translate(50%,0)}}
.spinner{width:22px;height:22px;border:3px solid #dfe3ff;border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.muted-note{font-size:.75rem;color:var(--ink-soft);text-align:center;padding:16px 0}
footer.app-foot{text-align:center;color:#aab0d0;font-size:.75rem;padding:26px 0 10px}