:root{--ink:#243047;--muted:#687287;--paper:#fffdf8;--cream:#fff8ec;--line:#e8e1d6;--coral:#f47c68;--coral-dark:#c94f41;--sky:#64b7d6;--yellow:#f5c759;--mint:#74c7aa;--plum:#745a91;--shadow:0 18px 50px #392b1d1a}*{box-sizing:border-box}html{background:var(--cream);scroll-behavior:smooth;min-width:360px}body{background:radial-gradient(circle at 10% 8%, #f47c681a, transparent 24rem), radial-gradient(circle at 90% 30%, #64b7d617, transparent 26rem), var(--cream);color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font-family:PingFang HK,PingFang TC,Noto Sans TC,Microsoft JhengHei,system-ui,-apple-system,sans-serif}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline-offset:3px;outline:4px solid #64b7d673}a{color:var(--coral-dark)}.app-shell{min-height:100vh}.topbar{justify-content:space-between;align-items:center;gap:20px;width:min(1180px,100% - 40px);min-height:82px;margin:0 auto;display:flex}.brand,.parent-button,.language-switch button,.text-button,.back-button,.close-button{cursor:pointer;background:0 0;border:0}.brand{letter-spacing:.02em;align-items:center;gap:11px;min-height:52px;padding:4px;font-size:1.02rem;font-weight:850;display:inline-flex}.brand-mark{background:var(--coral);color:#fff;border-radius:13px 13px 13px 5px;place-items:center;width:40px;height:40px;display:grid;box-shadow:0 7px 18px #f47c684d}.topbar-actions{align-items:center;gap:12px;display:flex}.language-switch,.segmented{border:1px solid var(--line);background:#ffffffb8;border-radius:999px;padding:4px;display:flex}.language-switch button{min-width:48px;min-height:48px;color:var(--muted);border-radius:999px;padding:0 12px;font-size:.85rem;font-weight:800}.language-switch button.active,.segmented button.active{background:var(--ink);color:#fff;box-shadow:0 4px 12px #2430472e}.parent-button{border:1px solid var(--line);background:#ffffffb8;border-radius:999px;min-height:48px;padding:0 18px;font-size:.9rem;font-weight:750}.home-view,.study-view,.practice-view{width:min(1180px,100% - 40px);margin:0 auto}.study-launch-section{padding:70px 0 0}.study-launch-intro{max-width:680px;color:var(--muted);margin:10px 0 0;line-height:1.65}.study-launch-grid{grid-template-columns:repeat(2,1fr);gap:18px;display:grid}.study-launch-card{text-align:left;cursor:pointer;border:1px solid #0000;border-radius:26px;align-items:center;gap:18px;min-height:132px;padding:22px 24px;transition:transform .18s,box-shadow .18s;display:flex}.study-launch-card:hover{transform:translateY(-3px);box-shadow:0 18px 32px #392b1d1c}.study-launch-card.coral{background:#fff0ec;border-color:#f9d2ca}.study-launch-card.sky{background:#eaf8fc;border-color:#ccecf5}.study-launch-card>span:nth-child(2){flex-direction:column;gap:7px;min-width:0;display:flex}.study-launch-card strong{font-size:1.16rem}.study-launch-card small{color:var(--muted);font-size:.86rem;line-height:1.5}.hero{min-height:410px;box-shadow:var(--shadow);background:linear-gradient(135deg,#fffffff5,#fffbf0eb);border:1px solid #e8e1d6cc;border-radius:38px;grid-template-columns:1.1fr .9fr;align-items:center;gap:42px;margin-top:10px;padding:clamp(32px,5vw,68px);display:grid;overflow:hidden}.eyebrow,.section-kicker,.question-kicker,.feedback-label{color:var(--coral-dark);letter-spacing:.14em;text-transform:uppercase;margin:0 0 12px;font-size:.78rem;font-weight:850}.eyebrow{align-items:center;gap:9px;display:flex}.eyebrow span{background:var(--coral);border-radius:99px;width:28px;height:2px}.eyebrow.centered{justify-content:center}.hero h1,.summary-card h1{letter-spacing:-.06em;margin:0;font-size:clamp(2.7rem,6vw,5rem);line-height:1.02}.hero-subtitle{max-width:640px;color:var(--muted);margin:22px 0 0;font-size:clamp(1.03rem,2vw,1.25rem);line-height:1.8}.quick-settings{flex-wrap:wrap;gap:10px;margin-top:30px;display:flex}.quick-settings span{border:1px solid var(--line);color:#4b556a;background:#fff;border-radius:999px;align-items:center;min-height:40px;padding:9px 14px;font-size:.85rem;font-weight:750;display:inline-flex}.hero-scene{background:linear-gradient(#d7f1f8 0%,#eff9f7 56%,#c6e3d3 57%,#88c8ad 100%);border-radius:30px;min-height:280px;position:relative;overflow:hidden}.daily-mission{background:linear-gradient(135deg,#f7f0ff,#fffdf9);border:2px solid #ead9f7;border-radius:28px;grid-template-columns:auto 1fr auto;align-items:center;gap:20px;margin-top:24px;padding:24px 28px;display:grid;box-shadow:0 12px 30px #4a2f6214}.daily-mission.complete{background:linear-gradient(135deg,#eaf9f3,#fffdf9);border-color:#bfe5d7}.mission-symbol{background:var(--plum);color:#fff;border-radius:22px;place-items:center;width:68px;height:68px;font-size:2rem;font-weight:900;display:grid;box-shadow:0 9px 20px #4a2f622e}.daily-mission.complete .mission-symbol{background:var(--mint)}.mission-copy h2{margin:0;font-size:1.55rem}.mission-copy .section-kicker{margin-bottom:6px}.mission-details{flex-wrap:wrap;align-items:center;gap:7px;margin-top:10px;display:flex}.mission-details span,.mission-details b{color:var(--muted);background:#fff;border-radius:999px;padding:6px 10px;font-size:.76rem}.mission-details b{color:var(--plum)}.mission-result{color:#2f8066;margin:10px 0 0;font-size:.86rem;font-weight:800}.mission-start{background:var(--plum);color:#fff;cursor:pointer;border:0;border-radius:999px;min-height:54px;padding:0 22px;font-weight:850}.daily-mission.complete .mission-start{background:#3f9377}.mission-start span{margin-left:8px}.sun-shape{background:var(--yellow);border-radius:50%;width:74px;height:74px;position:absolute;top:30px;right:44px;box-shadow:0 0 0 16px #f5c75929}.cloud{background:#fffc;border-radius:99px;width:64px;height:20px;position:absolute}.cloud:before,.cloud:after{content:"";background:inherit;border-radius:50%;position:absolute;bottom:5px}.cloud:before{width:30px;height:30px;left:10px}.cloud:after{width:22px;height:22px;right:8px}.cloud.one{top:76px;left:38px}.cloud.two{top:128px;right:82px;transform:scale(.75)}.island{background:#347f72;border-radius:50% 50% 0 0;width:124%;height:150px;position:absolute;bottom:-58px;left:-12%;box-shadow:inset 0 12px #ffffff1f}.scene-icon{filter:drop-shadow(0 8px 10px #24304729);place-items:center;display:grid;position:absolute}.scene-icon.ferry{font-size:4.3rem;top:-53px;left:20%;transform:rotate(-3deg)}.scene-icon.flag{font-size:4.7rem;top:-128px;right:22%;transform:rotate(4deg)}.scene-icon.star{font-size:2.4rem;top:-105px;left:48%}.topics-section{padding:80px 0 40px}.section-heading{justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px;display:flex}.section-heading h2,.modal-heading h2{letter-spacing:-.035em;margin:0;font-size:clamp(1.75rem,4vw,2.45rem)}.text-button{min-height:48px;color:var(--muted);font-weight:750}.topic-grid{grid-template-columns:repeat(2,1fr);gap:18px;display:grid}.topic-card,.mixed-card{text-align:left;cursor:pointer;border:1px solid #0000;border-radius:28px;align-items:center;gap:20px;min-height:154px;padding:26px;transition:transform .18s,box-shadow .18s;display:flex;position:relative}.topic-card:hover,.mixed-card:hover{transform:translateY(-3px);box-shadow:0 18px 32px #392b1d1c}.topic-card.coral{background:#fff0ec;border-color:#f9d2ca}.topic-card.sky{background:#eaf8fc;border-color:#ccecf5}.topic-card.yellow{background:#fff8df;border-color:#f5e5ab}.topic-card.mint{background:#eaf8f1;border-color:#c8eadc}.topic-card.peach{background:#fff1df;border-color:#f4d8b5}.topic-icon,.mixed-icon{background:#ffffffd1;border-radius:23px;flex:none;place-items:center;width:74px;height:74px;font-size:2.2rem;display:grid;box-shadow:0 9px 20px #392b1d14}.topic-card-copy{flex-direction:column;gap:8px;min-width:0;display:flex}.topic-card strong,.mixed-card strong{font-size:1.25rem;display:block}.topic-card small,.mixed-card small{color:var(--muted);font-size:.92rem;line-height:1.55;display:block}.round-arrow{background:#ffffffd9;border-radius:50%;flex:none;place-items:center;width:42px;height:42px;margin-left:auto;font-weight:900;display:grid}.mixed-card{background:linear-gradient(135deg,#f2edf8,#fff);border-color:#ded1ec;width:100%;min-height:130px;margin-top:18px}.mixed-start{background:var(--plum);color:#fff;border-radius:999px;align-items:center;gap:12px;min-height:50px;margin-left:auto;padding:0 20px;font-weight:800;display:inline-flex}.mixed-start b{font-size:1.2rem}.trust-strip{border-top:1px solid var(--line);color:var(--muted);align-items:center;gap:13px;margin:28px 0 60px;padding:20px 24px;font-size:.87rem;display:flex}.trust-strip>span{color:var(--coral);font-size:1.4rem}.trust-strip p{margin:0}.trust-strip button{min-height:48px;color:var(--coral-dark);cursor:pointer;background:0 0;border:0;margin-left:auto;font-weight:750}.practice-view,.study-view{padding:14px 0 60px}.practice-topline{grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;min-height:52px;display:grid}.back-button{min-height:48px;color:var(--muted);justify-self:start;font-size:.9rem;font-weight:750}.practice-topic{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 16px;font-size:.84rem;font-weight:800}.question-count{color:var(--muted);font-variant-numeric:tabular-nums;justify-self:end;font-weight:800}.progress-track{background:#e9e4dc;border-radius:99px;height:8px;margin:8px 0 22px;overflow:hidden}.progress-track span{border-radius:inherit;background:linear-gradient(90deg, var(--coral), var(--yellow));height:100%;transition:width .24s;display:block}.question-panel{border:1px solid var(--line);min-height:620px;box-shadow:var(--shadow);background:#ffffffeb;border-radius:34px;padding:clamp(28px,4.5vw,58px)}.study-card-panel{border:1px solid var(--line);min-height:620px;box-shadow:var(--shadow);background:#ffffffeb;border-radius:34px;grid-template-columns:minmax(280px,.9fr) minmax(320px,1.1fr);grid-template-areas:"heading heading""media description""media autoplay""media actions";align-items:center;gap:24px 42px;padding:clamp(28px,4.5vw,58px);display:grid}.study-card-heading{grid-area:heading;justify-content:space-between;align-items:flex-start;gap:24px;display:flex}.study-card-heading h1{letter-spacing:-.045em;margin:0;font-size:clamp(2rem,5vw,3.8rem);line-height:1.15}.study-card-media{background:#f7f3ed;border-radius:28px;grid-area:media;min-width:0;padding:22px}.study-card-media .visual.flag{min-height:260px}.study-card-media .visual.flag img{max-height:230px}.study-card-media .visual.place{height:340px}.study-card-description{grid-area:description;margin:0;font-size:clamp(1.2rem,2.4vw,1.6rem);font-weight:720;line-height:1.75}.study-card-actions{grid-area:actions;gap:14px;display:grid}.study-autoplay-controls{background:#f2faf6;border:1px solid #d9e9e2;border-radius:20px;grid-area:autoplay;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:14px;padding:16px;display:grid}.study-autoplay-copy{gap:4px;display:grid}.study-autoplay-copy strong{color:var(--ink);font-size:1rem}.study-autoplay-copy small{color:var(--muted);font-size:.78rem;line-height:1.45}.study-autoplay-pause{color:var(--muted);gap:5px;font-size:.74rem;font-weight:750;display:grid}.study-autoplay-pause select{border:1px solid var(--line);min-height:48px;color:var(--ink);font:inherit;cursor:pointer;background:#fff;border-radius:14px;padding:0 38px 0 13px;font-size:.9rem}.study-autoplay-button{grid-column:1/-1;width:100%}.study-autoplay-button.is-playing{background:#355b4c}.study-step-actions{grid-template-columns:1fr 1fr;gap:12px;display:grid}.study-start-button{width:100%}.study-card-actions button:disabled{cursor:not-allowed;opacity:.42}.empty-study-card{text-align:center;align-content:center;place-items:center;gap:24px;display:grid}.empty-study-card h1{max-width:680px;margin:0;font-size:clamp(1.55rem,4vw,2.4rem);line-height:1.45}.question-heading-row{justify-content:space-between;align-items:flex-start;gap:24px;display:flex}.question-heading-row h1{letter-spacing:-.035em;max-width:800px;margin:0;font-size:clamp(1.65rem,4vw,2.85rem);line-height:1.35}.question-kicker{color:var(--sky)}.speak-button{color:#256d85;cursor:pointer;background:#ebf8fc;border:1px solid #cfe9f2;border-radius:999px;justify-content:center;align-items:center;gap:8px;min-width:54px;min-height:54px;padding:0 17px;font-weight:800;display:inline-flex}.target-wrap{background:#f7f3ed;border-radius:24px;align-items:center;gap:18px;margin:32px 0 24px;padding:18px;display:flex}.target-wrap>span{color:var(--muted);letter-spacing:.08em;padding:0 6px;font-size:.78rem;font-weight:850}.target-card{border:2px solid var(--yellow);background:#fff;border-radius:19px;align-items:center;gap:13px;min-width:180px;padding:12px 20px;display:flex}.target-card strong{font-size:1.12rem}.target-card.flag-target{width:min(100%,360px);padding:16px}.visual{border-radius:16px;place-items:center;width:100%;min-height:90px;display:grid;overflow:hidden}.visual img{object-fit:contain;pointer-events:none;-webkit-user-select:none;user-select:none;width:100%;height:100%;max-height:190px;display:block}.visual.object{min-height:116px}.visual.object img{width:min(112px,72%);height:min(112px,72%)}.visual.object.large{width:64px;min-height:64px}.visual.object.large img{width:58px;height:58px}.visual.flag{background:#f2efe9;min-height:128px}.visual.flag img{border:1px solid #24304724;width:calc(100% - 28px);height:auto;max-height:145px;box-shadow:0 7px 18px #2430471f}.visual.place{background:#e9edf0;height:170px}.visual.place img{object-fit:contain;width:100%;height:100%;max-height:none}.visual.scene{background:linear-gradient(145deg,#fff9ec,#f1f8ff);border-radius:18px;place-items:center;min-height:116px;display:grid}.visual.scene span{filter:drop-shadow(0 8px 8px #392b1d1f);font-size:clamp(3.4rem,7vw,5rem);line-height:1}.options-grid{grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px;display:grid}.options-grid.three{grid-template-columns:repeat(3,1fr)}.options-grid.scene{grid-template-columns:repeat(2,1fr)}.options-grid.scene .option-card{min-height:205px}.options-grid.scene .option-select{padding:14px}.options-grid.scene .option-label{font-size:1.05rem;line-height:1.35}.option-card{background:#fffdf9;border:2px solid #e5e0d8;border-radius:23px;flex-direction:column;justify-content:center;align-items:stretch;gap:8px;min-width:0;min-height:174px;padding:8px;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex;position:relative}.option-card:hover:not(.disabled),.option-card:focus-within{border-color:var(--sky);transform:translateY(-3px);box-shadow:0 13px 24px #24304717}.option-select{cursor:pointer;background:0 0;border:0;border-radius:17px;flex-direction:column;flex:1;justify-content:center;align-items:stretch;gap:8px;width:100%;min-height:150px;padding:6px;display:flex}.option-select:disabled{cursor:default;opacity:1}.option-listen{color:#256d85;cursor:pointer;z-index:2;background:#ebf8fcf5;border:1px solid #cfe9f2;border-radius:50%;place-items:center;width:46px;height:46px;display:grid;position:absolute;top:8px;right:8px;box-shadow:0 5px 12px #2430471a}.option-card.selected{border-color:var(--sky);background:#f2fbfe}.option-card.retrying{background:#fff9ea;border-color:#e8b96a;animation:.3s gentle-shake}.option-card.correct{border-color:var(--mint);background:#edfaf4;box-shadow:0 0 0 4px #74c7aa24}.options-grid.flag .option-card{min-height:92px;padding:8px}.options-grid.flag .option-label{font-size:1.08rem}.options-grid.flag .option-select{min-height:76px;padding:8px 54px 8px 8px}@keyframes gentle-shake{0%,to{transform:translate(0)}35%{transform:translate(-4px)}70%{transform:translate(4px)}}.option-label{text-align:center;font-size:1.02rem;font-weight:820;line-height:1.3;display:block}.correct-badge{background:var(--mint);color:#fff;border-radius:50%;place-items:center;width:34px;height:34px;font-weight:900;display:grid;position:absolute;top:10px;left:10px}.answer-zone{min-height:116px;margin-top:28px}.try-message,.reason-card,.feedback-card{border-radius:22px;padding:20px 22px}.try-message{color:#765625;background:#fff7e8;justify-content:space-between;align-items:center;gap:18px;display:flex}.try-message p{margin:0;font-weight:750}.reason-card{background:#eef9f5;border:1px solid #cce9de;grid-template-columns:auto 1fr auto;align-items:center;gap:17px;display:grid}.reason-icon{background:#fff;border-radius:17px;place-items:center;width:52px;height:52px;font-size:1.5rem;display:grid}.reason-card h2{margin:0 0 6px;font-size:1.15rem}.reason-card p{color:var(--muted);margin:0;font-size:.9rem}.feedback-card{background:#f3faf6;border:1px solid #cde8dd;grid-template-columns:1fr auto;align-items:end;gap:24px;display:grid}.feedback-label{color:#31866a}.feedback-copy h2{max-width:760px;margin:0;font-size:1.18rem;line-height:1.65}.alternatives{color:var(--muted);margin:10px 0 0;font-size:.86rem}.feedback-actions{flex-direction:column;gap:10px;display:flex}.primary-button,.soft-button,.voice-test{cursor:pointer;border-radius:999px;min-height:50px;padding:0 20px;font-weight:820}.primary-button{background:var(--coral);color:#fff;border:0;box-shadow:0 8px 18px #f47c6840}.soft-button{border:1px solid var(--line);color:var(--ink);background:#fff}.speech-notice,.settings-notice{color:#72531d;background:#fff4dd;border-radius:14px;margin:16px 0 0;padding:13px 16px;font-size:.86rem;line-height:1.5}.summary-view{place-items:center;min-height:calc(100vh - 82px);padding:50px 20px 90px;display:grid;position:relative;overflow:hidden}.summary-card{border:1px solid var(--line);width:min(680px,100%);box-shadow:var(--shadow);text-align:center;z-index:1;background:#fffffff0;border-radius:38px;padding:clamp(36px,7vw,72px);position:relative}.summary-card h1{font-size:clamp(2.2rem,7vw,3.8rem)}.summary-card>p:not(.eyebrow){max-width:480px;color:var(--muted);margin:18px auto 0;font-size:1.05rem;line-height:1.75}.summary-medal{background:#fff6cf;border-radius:28px;place-items:center;width:92px;height:92px;margin:0 auto 26px;font-size:3.3rem;display:grid;box-shadow:0 13px 26px #f5c7593b}.summary-stat{background:#eef9f5;border-radius:22px;flex-direction:column;width:min(270px,100%);margin:30px auto;padding:20px;display:flex}.summary-stat strong{color:#2f8b6c;font-size:2.4rem}.summary-stat strong small{color:var(--muted);font-size:1.1rem}.summary-stat span{color:var(--muted);font-size:.85rem;font-weight:750}.summary-actions{justify-content:center;gap:12px;display:flex}.celebration span{color:var(--yellow);font-size:2rem;position:absolute}.celebration span:first-child{top:18%;left:13%;transform:rotate(-15deg)}.celebration span:nth-child(2){color:var(--sky);top:24%;right:15%}.celebration span:nth-child(3){color:var(--coral);bottom:14%;left:18%}.modal-backdrop{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:50;background:#1d25347a;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.settings-panel,.sources-panel{background:var(--paper);border-radius:30px;width:min(900px,100%);max-height:calc(100vh - 48px);padding:30px;overflow:auto;box-shadow:0 30px 90px #14182347}.sources-panel{width:min(820px,100%)}.modal-heading{justify-content:space-between;align-items:flex-start;gap:20px;display:flex}.modal-heading>div>p:last-child{color:var(--muted);margin:8px 0 0}.close-button{background:#f2eee7;border-radius:50%;flex:none;width:48px;height:48px;font-size:1.7rem}.settings-grid{grid-template-columns:1fr 1fr;gap:16px;margin-top:28px;display:grid}.mission-builder{background:#f8f3fc;border:1px solid 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