:root{--ink:#202620;--muted:#747971;--paper:#f7f4ec;--card:#fffdf7;--line:#dfddd4;--green:#315b48;--green2:#dce8df;--red:#b65243;--amber:#e7aa4d;--blue:#d9e5e8;--shadow:0 18px 55px rgba(40,45,38,.09);font-family:"DM Sans","Noto Sans KR","Noto Sans JP",sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 80% -10%,#e1ebe2 0,transparent 30%),var(--paper);min-height:100vh}button{font:inherit;color:inherit}.shell{width:min(100%,560px);min-height:100vh;margin:auto;background:rgba(247,244,236,.85);position:relative;padding-bottom:92px}.topbar{height:72px;padding:0 22px;display:flex;align-items:center;position:sticky;top:0;z-index:10;background:rgba(247,244,236,.9);backdrop-filter:blur(16px);border-bottom:1px solid rgba(223,221,212,.65)}.brand{border:0;background:none;display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;cursor:pointer;padding:4px}.brand-mark{width:33px;height:33px;border-radius:11px;background:var(--green);color:white;display:grid;place-items:center;font-family:"Noto Sans JP"}.level-button{margin-left:auto;border:1px solid var(--line);background:var(--card);border-radius:20px;padding:8px 12px;display:flex;align-items:center;gap:6px;font-weight:700;cursor:pointer}.level-button svg{width:14px;fill:none;stroke:currentColor;stroke-width:1.8}.level-menu{display:none;position:absolute;right:20px;top:62px;background:white;border:1px solid var(--line);border-radius:14px;padding:6px;box-shadow:var(--shadow)}.level-menu.open{display:grid}.level-menu button{border:0;background:transparent;border-radius:9px;padding:9px 20px;cursor:pointer}.level-menu button:hover,.level-menu button[aria-selected=true]{background:var(--green2);color:var(--green);font-weight:700}main{padding:26px 22px 20px;min-height:calc(100vh - 164px)}.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--green);font-weight:700}.hero{padding:14px 0 22px}.hero h1{font-size:36px;line-height:1.2;letter-spacing:-.04em;margin:9px 0 11px}.hero h1 em{font-style:normal;color:var(--green)}.hero p{margin:0;color:var(--muted);line-height:1.7}.streak-card{background:var(--green);color:white;border-radius:24px;padding:20px 21px;display:grid;grid-template-columns:1fr auto;align-items:center;box-shadow:0 14px 35px rgba(49,91,72,.2);overflow:hidden;position:relative}.streak-card:after{content:"日";position:absolute;right:64px;top:-33px;font-size:120px;opacity:.055;font-family:"Noto Sans JP"}.streak-label{font-size:12px;opacity:.72}.streak-value{font-size:27px;font-weight:700;margin-top:3px}.streak-ring{width:58px;height:58px;border:5px solid rgba(255,255,255,.22);border-top-color:#fff;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700}.section-head{display:flex;justify-content:space-between;align-items:end;margin:28px 0 13px}.section-head h2{font-size:19px;margin:0}.section-head span,.section-head button{font-size:12px;color:var(--muted);border:0;background:none}.lesson-grid{display:grid;gap:11px}.lesson-card{border:1px solid var(--line);background:var(--card);border-radius:19px;padding:17px;display:grid;grid-template-columns:48px 1fr auto;align-items:center;gap:13px;text-align:left;cursor:pointer;transition:.18s}.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#c8cec8}.lesson-icon{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;font-size:20px;font-weight:700;font-family:"Noto Sans JP"}.lesson-card:nth-child(1) .lesson-icon{background:#e6ede3;color:#315b48}.lesson-card:nth-child(2) .lesson-icon{background:#f6e7d3;color:#9a6526}.lesson-card:nth-child(3) .lesson-icon{background:#dfe9ed;color:#476b79}.lesson-title{font-weight:700}.lesson-meta{font-size:12px;color:var(--muted);margin-top:4px}.lesson-progress{width:38px;height:38px;border-radius:50%;background:conic-gradient(var(--green) var(--pct),#e7e6df 0);display:grid;place-items:center}.lesson-progress:after{content:"";width:29px;height:29px;background:var(--card);border-radius:50%}.quote{border-top:1px solid var(--line);margin-top:28px;padding:19px 4px;color:var(--muted);font-size:13px;line-height:1.7}.bottom-nav{position:fixed;z-index:20;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,560px);height:78px;background:rgba(255,253,247,.94);backdrop-filter:blur(18px);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);padding:7px 10px 10px}.nav-item{border:0;background:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:#8b8e87;font-size:11px;position:relative;cursor:pointer}.nav-item.active{color:var(--green);font-weight:700}.nav-icon{font-size:20px;line-height:1}.nav-item b{position:absolute;top:4px;left:55%;background:var(--red);color:white;border-radius:9px;min-width:16px;padding:1px 4px;font-size:9px}.page-head{margin:5px 0 24px}.page-head h1{font-size:29px;margin:7px 0}.page-head p{color:var(--muted);margin:0;line-height:1.6}.study-top{display:flex;align-items:center;gap:12px;margin-bottom:24px}.back{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:var(--card);cursor:pointer}.study-track{height:6px;background:#e2e1da;border-radius:4px;flex:1;overflow:hidden}.study-track i{height:100%;background:var(--green);display:block;border-radius:4px;transition:.3s}.count{font-size:12px;color:var(--muted)}.question-card{background:var(--card);border:1px solid var(--line);border-radius:27px;min-height:260px;padding:28px 23px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;box-shadow:0 10px 35px rgba(30,34,28,.05)}.q-type{font-size:11px;color:var(--muted);letter-spacing:.08em}.q-main{font-family:"Noto Sans JP";font-size:42px;font-weight:600;margin:18px 0 9px;line-height:1.35}.q-sub{color:var(--muted);font-size:14px;min-height:22px}.options{display:grid;gap:10px;margin-top:17px}.option{min-height:55px;border:1px solid var(--line);background:var(--card);border-radius:15px;padding:13px 16px;text-align:left;cursor:pointer;display:flex;gap:12px;align-items:center}.option b{width:25px;height:25px;background:#eeece5;border-radius:8px;display:grid;place-items:center;font-size:11px}.option:hover:not(:disabled){border-color:var(--green);background:#f5f8f4}.option.correct{border-color:var(--green);background:#e6f0e8}.option.wrong{border-color:var(--red);background:#fae9e6}.option:disabled{cursor:default}.feedback{margin-top:15px;border-radius:16px;padding:16px;display:none;line-height:1.55;font-size:14px}.feedback.show{display:block}.feedback.good{background:#dfece2;color:#294d3c}.feedback.bad{background:#f7e3df;color:#853d33}.primary{width:100%;border:0;background:var(--green);color:white;border-radius:15px;padding:16px;margin-top:14px;font-weight:700;cursor:pointer}.primary:hover{background:#274b3a}.empty{text-align:center;padding:52px 20px}.empty-icon{font-size:40px}.empty h2{margin:15px 0 8px}.empty p{color:var(--muted);line-height:1.6}.review-list{display:grid;gap:10px}.review-row{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:15px 16px;display:flex;align-items:center;gap:13px}.review-row .jp{font-family:"Noto Sans JP";font-size:20px;font-weight:600;min-width:72px}.review-row .meaning{font-size:13px;color:var(--muted);flex:1}.review-row button{border:0;background:var(--green2);color:var(--green);border-radius:10px;padding:8px 10px;cursor:pointer}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.stat{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:19px}.stat-label{font-size:12px;color:var(--muted)}.stat-value{font-size:27px;font-weight:700;margin-top:7px}.week-chart{height:175px;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:20px 15px 13px;display:flex;align-items:end;justify-content:space-between;gap:8px}.day{height:100%;flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:7px;color:var(--muted);font-size:10px}.bar{width:100%;max-width:28px;height:var(--h);min-height:4px;background:var(--green2);border-radius:8px 8px 3px 3px}.day.today .bar{background:var(--green)}.category-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.pick{border:1px solid var(--line);background:var(--card);border-radius:17px;padding:18px 5px;text-align:center;cursor:pointer}.pick span{font-family:"Noto Sans JP";display:block;font-size:25px;margin-bottom:7px}.pick b{font-size:13px}.complete{text-align:center;padding:25px 0}.complete-mark{width:85px;height:85px;border-radius:50%;background:var(--green2);color:var(--green);display:grid;place-items:center;font-size:39px;margin:20px auto}.complete h1{font-size:28px}.complete p{color:var(--muted);line-height:1.7}.complete-stats{display:flex;justify-content:center;gap:30px;margin:25px 0}.complete-stats b{display:block;font-size:24px}.complete-stats span{font-size:11px;color:var(--muted)}.toast{position:fixed;left:50%;bottom:94px;transform:translate(-50%,20px);background:#202620;color:white;padding:11px 17px;border-radius:12px;font-size:13px;opacity:0;pointer-events:none;transition:.25s;z-index:30}.toast.show{opacity:1;transform:translate(-50%,0)}
@media (min-width:700px){body{padding:24px 0}.shell{min-height:calc(100vh - 48px);border-radius:28px;box-shadow:var(--shadow);overflow:hidden}.bottom-nav{bottom:24px;border-radius:0 0 28px 28px}.hero h1{font-size:40px}}
@media (max-width:360px){main{padding-left:16px;padding-right:16px}.topbar{padding:0 16px}.hero h1{font-size:31px}.category-picker{gap:6px}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Sentence-first learning */
.sentence-card{background:var(--card);border:1px solid var(--line);border-radius:25px;padding:24px 21px;text-align:center;box-shadow:0 10px 35px rgba(30,34,28,.05)}
.sentence-label{font-size:11px;color:var(--green);font-weight:700;letter-spacing:.08em}.sentence-jp{font-family:"Noto Sans JP";font-size:24px;line-height:1.75;font-weight:600;margin:17px 0 8px}.sentence-jp mark{background:linear-gradient(transparent 58%,#f5dcae 58%);color:inherit;padding:0 2px}.sentence-reading{font-family:"Noto Sans JP";font-size:12px;color:var(--muted)}
.translation-toggle{border:0;background:#eeece5;color:var(--muted);border-radius:10px;padding:8px 12px;margin-top:16px;font-size:12px;cursor:pointer}.sentence-ko{margin-top:13px;padding-top:13px;border-top:1px solid var(--line);font-size:14px;color:#525951}.question-title{font-size:14px;font-weight:700;margin:22px 2px 10px}
.grammar-note,.usage-note{margin-top:12px;padding-top:12px;border-top:1px solid rgba(49,91,72,.16);text-align:left}.grammar-note p,.usage-note span{margin:6px 0;color:#4f6157}.compare{margin-top:11px;background:rgba(255,255,255,.57);border-radius:12px;padding:13px}.compare span{display:block;font-size:11px;font-weight:700;color:#8b6232}.compare strong{font-family:"Noto Sans JP";display:block;margin:7px 0 3px;color:var(--ink)}.compare em{font-style:normal;font-size:12px;color:var(--muted)}.compare p{font-size:12px;margin:8px 0 0}
.pick small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.learning-note{margin-top:22px;border-left:3px solid var(--amber);padding:4px 0 4px 14px}.learning-note b{font-size:13px}.learning-note p{font-size:12px;color:var(--muted);line-height:1.65;margin:5px 0}.sentence-row .meaning{line-height:1.55;font-family:"Noto Sans JP"}.stat-value small{font-size:12px;margin-left:2px}
.sentence-card[data-speak]{cursor:pointer;transition:border-color .2s,box-shadow .2s,transform .2s}.sentence-card[data-speak]:hover,.sentence-card[data-speak]:focus-visible{border-color:#a9bcae;box-shadow:0 13px 38px rgba(49,91,72,.12);outline:none}.sentence-card[data-speak]:active{transform:scale(.995)}.listen-hint{display:flex;align-items:center;justify-content:center;gap:7px;color:var(--green);font-size:11px;font-weight:700;margin-top:13px}.speaker-icon{width:25px;height:25px;border-radius:50%;background:var(--green2);display:grid;place-items:center;font-size:13px}.sentence-card.speaking{border-color:var(--green)}.sentence-card.speaking .speaker-icon{animation:speakerPulse .9s ease-in-out infinite}@keyframes speakerPulse{50%{transform:scale(1.16);background:#c5dacb}}

/* Launch-ready mobile flow */
.product-hero{display:grid;grid-template-columns:1fr 82px;gap:12px;align-items:center;padding:8px 0 18px}.hero-copy h1{font-size:36px;line-height:1.15;letter-spacing:-.045em;margin:10px 0}.hero-copy h1 em{font-style:normal;color:var(--green)}.hero-copy p{color:var(--muted);line-height:1.65;margin:0;font-size:14px}.goal-ring{width:78px;height:78px;border-radius:50%;background:conic-gradient(var(--green) var(--goal),#e2e4dd 0);display:grid;place-content:center;text-align:center;position:relative}.goal-ring:after{content:"";position:absolute;inset:7px;background:var(--paper);border-radius:50%}.goal-ring b,.goal-ring span{position:relative;z-index:1}.goal-ring b{font-size:18px}.goal-ring span{font-size:9px;color:var(--muted)}.hero-cta{margin:0 0 12px;display:flex;justify-content:space-between;align-items:center;font-size:15px;padding:17px 19px}
.resume-card{width:100%;border:1px solid #bfd1c4;background:linear-gradient(135deg,#f7fbf8,#e8f1ea);border-radius:19px;padding:14px 15px;display:grid;grid-template-columns:38px 1fr auto;align-items:center;gap:11px;text-align:left;cursor:pointer;margin-bottom:12px}.resume-card.compact{margin-bottom:18px}.resume-card span:nth-child(2){display:grid;gap:2px}.resume-card small,.resume-card em{font-size:10px;color:var(--muted);font-style:normal}.resume-card b{font-size:13px}.resume-card strong{font-size:11px;color:var(--green)}.resume-icon{width:36px;height:36px;border-radius:12px;background:var(--green);color:white;display:grid;place-items:center;font-size:11px}
.daily-card{background:var(--card);border:1px solid var(--line);border-radius:17px;padding:14px 16px}.daily-card>div:first-child{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px}.daily-card b{font-size:13px}.daily-card small{font-size:11px;color:var(--muted)}.goal-track{height:5px;background:#e6e5df;border-radius:4px;margin-top:11px;overflow:hidden}.goal-track i{display:block;height:100%;background:var(--amber);border-radius:4px}.progress-copy{font-size:11px;font-weight:700;color:var(--muted)}.lesson-card.completed{border-color:#bad0c0}.lesson-card.paused{border-color:var(--amber);box-shadow:0 6px 20px rgba(231,170,77,.1)}
.course-list{margin-top:14px}.flow-steps{display:flex;align-items:center;gap:7px;margin:2px 0 18px}.flow-steps span{font-size:10px;color:#9b9d97;white-space:nowrap}.flow-steps span.active{color:var(--green);font-weight:700}.flow-steps i{height:1px;background:var(--line);flex:1}.proof-strip{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:22px}.proof-strip div{border-top:1px solid var(--line);padding:13px 2px}.proof-strip b,.proof-strip span{display:block}.proof-strip b{font-size:12px}.proof-strip span{font-size:10px;color:var(--muted);margin-top:3px}
.study-top>div:nth-child(2){flex:1}.study-top>div:nth-child(2)>b{font-size:12px;display:block;margin-bottom:7px}.study-top .study-track{width:100%}.sticky-action{position:sticky;bottom:88px;box-shadow:0 10px 30px rgba(49,91,72,.18)}.secondary{width:100%;border:1px solid var(--line);background:transparent;border-radius:14px;padding:14px;margin-top:9px;font-weight:700;cursor:pointer}.result-panel{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin:22px 0}.result-panel div{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:15px 5px}.result-panel span,.result-panel b{display:block}.result-panel span{font-size:10px;color:var(--muted)}.result-panel b{font-size:21px;margin-top:5px}
.exit-dialog{width:min(calc(100% - 36px),400px);border:0;border-radius:24px;padding:25px;background:var(--card);color:var(--ink);box-shadow:var(--shadow)}.exit-dialog::backdrop{background:rgba(24,30,25,.48);backdrop-filter:blur(3px)}.exit-dialog h2{font-size:21px;margin:13px 0 7px}.exit-dialog p{color:var(--muted);font-size:13px;line-height:1.6;margin:0 0 10px}.dialog-icon{width:44px;height:44px;border-radius:14px;background:var(--green2);color:var(--green);display:grid;place-items:center;font-size:21px}.offline-bar{position:fixed;z-index:40;top:8px;left:50%;transform:translateX(-50%);background:#252a25;color:white;border-radius:12px;padding:9px 13px;font-size:11px;box-shadow:var(--shadow)}
.plus-button{order:2;border:0;background:#f2d897;color:#5d4618;border-radius:18px;padding:7px 10px;font-size:11px;font-weight:800;margin-left:7px}.level-button{order:1;margin-left:auto}.level-menu{z-index:12}.billing-dialog{width:min(calc(100% - 28px),430px);border:0;border-radius:26px;padding:28px;background:var(--card);color:var(--ink);box-shadow:var(--shadow)}.billing-dialog::backdrop{background:rgba(20,27,22,.56);backdrop-filter:blur(4px)}.billing-close{position:absolute;right:16px;top:14px;border:0;background:#efeee8;width:34px;height:34px;border-radius:50%;font-size:20px}.plan-badge{display:inline-block;background:#f3dfaa;color:#6c5117;border-radius:20px;padding:6px 10px;font-size:10px;font-weight:800;letter-spacing:.08em}.billing-dialog h2{font-size:25px;margin:15px 0 8px}.billing-lead{color:var(--muted);line-height:1.65;font-size:13px}.price{margin:22px 0}.price b{font-size:32px}.price span{color:var(--muted);font-size:12px}.benefits{list-style:none;padding:0;display:grid;gap:10px;font-size:13px}.billing-fine{text-align:center;color:var(--muted);font-size:10px;line-height:1.5}.billing-summary{display:grid;border:1px solid var(--line);border-radius:16px;margin:20px 0;overflow:hidden}.billing-summary span{display:flex;justify-content:space-between;padding:13px;font-size:12px;border-bottom:1px solid var(--line)}.billing-summary span:last-child{border:0}.danger{color:var(--red)}.billing-loading,.billing-state{text-align:center;padding:28px 4px}.billing-loading i{display:block;width:35px;height:35px;border:3px solid var(--green2);border-top-color:var(--green);border-radius:50%;animation:spin .8s linear infinite;margin:auto}.billing-state>span{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;background:#f4e1dd;color:var(--red);font-size:24px;margin:auto}.billing-state.success>span{background:var(--green2);color:var(--green)}@keyframes spin{to{transform:rotate(360deg)}}