:root{--ocean-deep:#0a2a4a;--ocean-mid:#0e4272;--ocean-light:#1a6ba0;--ocean-bright:#2196d0;--seafoam:#4ecdc4;--seafoam-light:#a8edea;--sand:#ffeaa7;--coral:#ff7675;--white:#f8fcff;--card-bg:rgba(255,255,255,0.96);--shadow:0 8px 32px rgba(10,42,74,0.25);--radius:20px;--radius-sm:12px;}
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:'Nunito',sans-serif;background:var(--ocean-deep);min-height:100vh;color:var(--white);overflow-x:hidden;}
.ocean-bg{position:fixed;inset:0;z-index:0;background:linear-gradient(180deg,#0a2a4a 0%,#0e3d6e 40%,#0e5a8a 80%,#0d7ea8 100%);overflow:hidden;}
.bubble{position:absolute;border-radius:50%;background:rgba(78,205,196,0.08);animation:rise linear infinite;}
.bubble:nth-child(1){width:20px;height:20px;left:10%;animation-duration:8s}
.bubble:nth-child(2){width:12px;height:12px;left:30%;animation-duration:11s;animation-delay:2s}
.bubble:nth-child(3){width:25px;height:25px;left:65%;animation-duration:9s;animation-delay:4s}
@keyframes rise{from{bottom:-50px;opacity:0}10%{opacity:1}90%{opacity:.5}to{bottom:110vh;opacity:0}}
.app{position:relative;z-index:1;max-width:480px;margin:0 auto;min-height:100vh;}
.screen{display:none;flex-direction:column;min-height:100vh;animation:fadeIn .35s ease;}
.screen.active{display:flex;}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@keyframes cardIn{from{opacity:0;transform:scale(.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.top-header{padding:20px 24px 16px;display:flex;align-items:center;gap:12px;}
.back-btn{background:rgba(255,255,255,.1);border:none;color:var(--white);width:36px;height:36px;border-radius:10px;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s;text-decoration:none;}
.back-btn:hover{background:rgba(255,255,255,.18);}
.top-title{font-family:'Kaisei Decol',serif;font-size:20px;color:var(--white);}
.top-subtitle{font-size:12px;color:var(--seafoam-light);opacity:.85;}
.unit-hero{padding:16px 24px 0;text-align:center;}
.shark-mini-wrap{width:72px;height:72px;margin:0 auto 8px;filter:drop-shadow(0 6px 16px rgba(78,205,196,.4));animation:float 3s ease-in-out infinite;}
.core-badge{display:inline-block;background:linear-gradient(135deg,var(--seafoam),var(--ocean-bright));border-radius:100px;padding:5px 16px;font-size:11px;font-weight:800;letter-spacing:.5px;color:var(--ocean-deep);margin-bottom:12px;}
.level-section{padding:0 24px 16px;}
.level-intro{font-size:13px;color:rgba(255,255,255,.75);line-height:1.6;margin-bottom:16px;padding:12px 14px;background:rgba(255,255,255,.06);border-radius:var(--radius-sm);}
.level-card{background:rgba(255,255,255,.08);border:1.5px solid rgba(255,255,255,.12);border-radius:var(--radius);padding:18px 20px;margin-bottom:12px;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:16px;}
.level-card:hover{background:rgba(255,255,255,.14);transform:translateX(4px);}
.level-card.level-a{border-color:rgba(78,205,196,.4);}
.level-card.level-b{border-color:rgba(33,150,208,.4);}
.level-card.level-c{border-color:rgba(255,118,117,.4);}
.level-icon{font-size:28px;flex-shrink:0;}
.level-info{flex:1;}
.level-name{font-size:15px;font-weight:800;margin-bottom:2px;}
.level-cefr{font-size:11px;font-weight:700;margin-bottom:3px;}
.level-cefr.a{color:var(--seafoam);}
.level-cefr.b{color:#7dd3fc;}
.level-cefr.c{color:#fca5a5;}
.level-desc{font-size:11px;color:rgba(255,255,255,.55);}
.level-count{font-size:11px;font-weight:800;color:rgba(255,255,255,.4);flex-shrink:0;}
.level-progress-mini{width:50px;height:5px;background:rgba(255,255,255,.1);border-radius:100px;margin-top:6px;overflow:hidden;}
.level-progress-fill{height:100%;border-radius:100px;background:var(--seafoam);transition:width .8s ease;}
.learn-header{padding:16px 24px;display:flex;align-items:center;gap:12px;}
.learn-progress-wrap{flex:1;}
.learn-progress-text{font-size:11px;color:var(--seafoam);font-weight:800;text-transform:uppercase;letter-spacing:.8px;margin-bottom:5px;}
.dots{display:flex;gap:4px;}
.dot{width:24px;height:5px;border-radius:100px;background:rgba(255,255,255,.15);transition:background .3s;}
.dot.done{background:var(--seafoam);}
.dot.cur{background:var(--seafoam-light);}
.card-wrap{flex:1;padding:8px 24px 16px;display:flex;flex-direction:column;}
.idiom-card{background:var(--card-bg);border-radius:var(--radius);padding:24px 22px;box-shadow:var(--shadow);flex:1;display:flex;flex-direction:column;animation:cardIn .35s cubic-bezier(.34,1.56,.64,1);min-height:340px;}
.badge{display:inline-flex;align-items:center;gap:5px;padding:4px 11px;border-radius:100px;font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.8px;margin-bottom:18px;width:fit-content;}
.badge-idiom{background:rgba(10,42,74,.07);color:var(--ocean-deep);}
.badge-visual{background:rgba(255,118,117,.12);color:#c0392b;}
.badge-break{background:rgba(78,205,196,.15);color:#0a7a73;}
.badge-ex{background:rgba(250,177,160,.2);color:#8b4513;}
.card-main{font-family:'Kaisei Decol',serif;font-size:26px;font-weight:700;color:var(--ocean-deep);margin-bottom:6px;line-height:1.2;}
.card-main .hi{color:var(--ocean-bright);position:relative;}
.card-main .hi::after{content:'';position:absolute;bottom:2px;left:0;right:0;height:3px;background:var(--seafoam);border-radius:2px;}
.card-reading{font-size:13px;color:rgba(10,42,74,.4);margin-bottom:16px;font-style:italic;}
.card-meaning{font-size:19px;font-weight:800;color:var(--ocean-deep);margin-bottom:4px;}
.usage-tag{display:inline-block;background:rgba(33,150,208,.12);color:var(--ocean-light);border-radius:100px;padding:3px 10px;font-size:10px;font-weight:800;margin-bottom:14px;}
.core-box{background:linear-gradient(135deg,rgba(33,150,208,.07),rgba(78,205,196,.1));border:1.5px solid rgba(78,205,196,.25);border-radius:var(--radius-sm);padding:13px 15px;margin-bottom:10px;}
.core-label{font-size:10px;font-weight:800;color:var(--ocean-light);text-transform:uppercase;letter-spacing:.8px;margin-bottom:5px;}
.core-text{font-size:13px;font-weight:700;color:var(--ocean-deep);line-height:1.5;}
.unified-box{background:rgba(255,118,117,.07);border:1.5px solid rgba(255,118,117,.2);border-radius:var(--radius-sm);padding:10px 14px;margin-bottom:10px;}
.unified-label{font-size:10px;font-weight:800;color:#c0392b;margin-bottom:4px;}
.unified-text{font-size:13px;font-weight:700;color:var(--ocean-deep);line-height:1.5;}
.ex-sentence{font-size:15px;font-weight:700;color:var(--ocean-deep);line-height:1.7;padding:12px 14px;background:rgba(10,42,74,.04);border-radius:var(--radius-sm);border-left:3px solid var(--seafoam);margin-bottom:8px;}
.ex-sentence .em{color:var(--ocean-bright);}
.ex-ja{font-size:12px;color:rgba(10,42,74,.5);padding:0 2px;}
.shark-say{display:flex;align-items:flex-start;gap:8px;background:rgba(10,42,74,.04);border-radius:var(--radius-sm);padding:10px 12px;margin-top:12px;}
.shark-ico{font-size:20px;flex-shrink:0;}
.shark-name-sm{font-size:9px;font-weight:800;color:var(--ocean-bright);text-transform:uppercase;letter-spacing:.4px;margin-bottom:2px;}
.shark-txt{font-size:12px;font-weight:600;color:var(--ocean-deep);line-height:1.55;}
.card-nav{display:flex;gap:10px;margin-top:14px;}
.btn-back-card{flex:0 0 48px;height:48px;background:rgba(255,255,255,.08);border:1.5px solid rgba(255,255,255,.15);border-radius:var(--radius-sm);color:var(--white);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;}
.btn-back-card:hover{background:rgba(255,255,255,.15);}
.btn-next-card{flex:1;height:48px;background:linear-gradient(135deg,var(--seafoam),var(--ocean-bright));border:none;border-radius:var(--radius-sm);color:var(--ocean-deep);font-family:'Nunito',sans-serif;font-size:14px;font-weight:900;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;transition:all .2s;box-shadow:0 4px 14px rgba(78,205,196,.35);}
.btn-next-card:hover{transform:translateY(-1px);}
.quiz-header{padding:16px 24px;display:flex;align-items:center;gap:12px;}
.quiz-mode-badge{padding:4px 10px;border-radius:100px;font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.5px;}
.mode-basic{background:rgba(78,205,196,.2);color:var(--seafoam);}
.mode-adv{background:rgba(255,118,117,.2);color:var(--coral);}
.quiz-card{background:var(--card-bg);border-radius:var(--radius);padding:20px;margin:0 24px;box-shadow:var(--shadow);animation:cardIn .35s ease;}
.quiz-q-label{font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:1px;color:var(--ocean-bright);margin-bottom:12px;}
.quiz-sentence{font-size:16px;font-weight:700;color:var(--ocean-deep);line-height:1.7;margin-bottom:5px;}
.quiz-blank{display:inline-block;min-width:80px;border-bottom:3px solid var(--ocean-bright);margin:0 3px;text-align:center;color:var(--ocean-bright);font-weight:900;transition:all .3s;}
.quiz-ja{font-size:11px;color:rgba(10,42,74,.45);margin-bottom:18px;}
.quiz-opts{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-bottom:14px;}
.quiz-opt{padding:12px 10px;background:rgba(10,42,74,.05);border:2px solid rgba(10,42,74,.1);border-radius:var(--radius-sm);font-family:'Nunito',sans-serif;font-size:13px;font-weight:700;color:var(--ocean-deep);cursor:pointer;text-align:center;transition:all .2s;line-height:1.3;}
.quiz-opt:hover{background:rgba(33,150,208,.08);border-color:var(--ocean-bright);}
.quiz-opt.correct{background:rgba(78,205,196,.15);border-color:var(--seafoam);color:#0a7a73;}
.quiz-opt.wrong{background:rgba(255,118,117,.12);border-color:var(--coral);color:#c0392b;}
.quiz-fb{display:none;border-radius:var(--radius-sm);padding:12px 14px;animation:fadeIn .3s ease;margin-bottom:10px;}
.quiz-fb.show{display:block;}
.quiz-fb.ok{background:rgba(78,205,196,.1);border:1.5px solid rgba(78,205,196,.3);}
.quiz-fb.ng{background:rgba(255,118,117,.08);border:1.5px solid rgba(255,118,117,.25);}
.fb-top{display:flex;gap:8px;align-items:flex-start;margin-bottom:8px;}
.fb-text{font-size:12px;font-weight:600;color:var(--ocean-deep);line-height:1.5;}
.core-panel{background:rgba(33,150,208,.06);border:1.5px solid rgba(78,205,196,.25);border-radius:10px;padding:10px 12px;}
.core-panel-title{font-size:10px;font-weight:800;color:var(--ocean-light);text-transform:uppercase;letter-spacing:.8px;margin-bottom:8px;}
.core-panel-row{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:6px;}
.core-panel-item{background:rgba(255,255,255,.65);border-radius:8px;padding:7px 9px;}
.core-panel-label{font-size:9px;font-weight:800;color:var(--ocean-light);margin-bottom:2px;}
.core-panel-val{font-size:11px;font-weight:700;color:var(--ocean-deep);line-height:1.4;}
.core-panel-unified{background:rgba(255,118,117,.08);border-radius:8px;padding:7px 9px;font-size:11px;font-weight:700;color:var(--ocean-deep);line-height:1.5;}
.quiz-next-btn{display:none;width:100%;padding:14px;background:linear-gradient(135deg,var(--seafoam),var(--ocean-bright));border:none;border-radius:var(--radius-sm);color:var(--ocean-deep);font-family:'Nunito',sans-serif;font-size:14px;font-weight:900;cursor:pointer;transition:all .2s;}
.quiz-next-btn.show{display:block;animation:fadeIn .3s ease;}
.shark-hint{display:flex;gap:8px;align-items:flex-start;background:rgba(255,255,255,.06);border-radius:var(--radius-sm);padding:10px 14px;margin:14px 24px 0;}
.result-wrap{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 24px;text-align:center;}
.result-shark{font-size:72px;margin-bottom:16px;animation:float 3s ease-in-out infinite;}
.score-circle{width:130px;height:130px;border-radius:50%;background:linear-gradient(135deg,var(--seafoam),var(--ocean-bright));display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 20px;box-shadow:0 8px 28px rgba(78,205,196,.4);}
.score-num{font-family:'Kaisei Decol',serif;font-size:38px;font-weight:700;color:var(--ocean-deep);line-height:1;}
.score-total{font-size:11px;font-weight:800;color:rgba(10,42,74,.6);}
.result-title{font-family:'Kaisei Decol',serif;font-size:22px;color:var(--white);margin-bottom:8px;}
.result-comment{font-size:13px;color:var(--seafoam-light);margin-bottom:28px;line-height:1.6;max-width:280px;}
.btn-primary{display:block;width:100%;padding:16px;background:linear-gradient(135deg,var(--seafoam),var(--ocean-bright));color:var(--ocean-deep);font-family:'Nunito',sans-serif;font-size:15px;font-weight:900;border:none;border-radius:var(--radius);cursor:pointer;box-shadow:0 5px 20px rgba(78,205,196,.4);transition:all .2s;margin-bottom:10px;}
.btn-primary:hover{transform:translateY(-2px);}
.btn-secondary{display:block;width:100%;padding:13px;background:rgba(255,255,255,.08);color:var(--white);font-family:'Nunito',sans-serif;font-size:13px;font-weight:700;border:1.5px solid rgba(255,255,255,.15);border-radius:var(--radius);cursor:pointer;transition:all .2s;margin-bottom:10px;text-decoration:none;text-align:center;}
.review-wrap{flex:1;padding:0 24px 24px;overflow-y:auto;}
.review-section{margin-bottom:18px;}
.review-section-title{font-size:11px;font-weight:800;color:var(--seafoam);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;}
.idiom-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:100px;font-size:11px;font-weight:700;margin:3px;}
.chip-ok{background:rgba(78,205,196,.18);color:var(--seafoam);border:1px solid rgba(78,205,196,.3);}
.chip-ng{background:rgba(255,118,117,.14);color:var(--coral);border:1px solid rgba(255,118,117,.25);}
.usage-bar{margin-bottom:12px;}
.usage-bar-label{display:flex;justify-content:space-between;font-size:12px;font-weight:700;color:var(--white);margin-bottom:4px;}
.usage-bar-label span{color:var(--seafoam-light);font-size:11px;}
.usage-bar-bg{background:rgba(255,255,255,.1);border-radius:100px;height:7px;overflow:hidden;}
.usage-bar-fill{height:100%;border-radius:100px;background:linear-gradient(90deg,var(--seafoam),var(--ocean-bright));transition:width 1s cubic-bezier(.34,1.06,.64,1);}