:root{--purple:#6d28d9;--purple-dark:#4c1d95;--pink:#e75b9b;--yellow:#f5cc52;--ink:#2d2441;--muted:#766985;--line:#e8e2ef;--soft:#f3effc;--radius:20px;font-family:"PingFang TC","Microsoft JhengHei",sans-serif;color:var(--ink);background:#f6f5fb;font-synthesis:none}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;padding:max(16px,env(safe-area-inset-top)) 12px max(28px,env(safe-area-inset-bottom));font-size:17px;line-height:1.65;background:linear-gradient(150deg,#f5f0ff 0,#fff6fa 65%,#fffcef 100%);min-height:100svh}main{max-width:780px;margin:auto;padding:26px;background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:0 16px 60px #49326e0d}.app-topline{display:flex;align-items:center;justify-content:space-between;font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--muted);margin-bottom:14px}.app-topline span:last-child{letter-spacing:0;background:var(--soft);color:var(--purple);border-radius:100px;padding:4px 12px}header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}h1{margin:0;color:var(--purple-dark);font-size:1.5rem;line-height:1.55;letter-spacing:.015em}h2,h3{color:var(--purple-dark);line-height:1.7}a{color:var(--purple);text-underline-offset:3px}button,input,select{font:inherit}button{min-height:46px;border:1px solid transparent;border-radius:13px;padding:10px 14px;font-weight:700;background:var(--soft);color:var(--purple-dark);cursor:pointer;touch-action:manipulation;transition:background .15s,border-color .15s,transform .15s}button:hover{background:#e9e1fc}button:active{transform:translateY(1px)}button:disabled{opacity:.5;cursor:default}button.primary,button[aria-pressed=true]{background:var(--purple);color:#fff}button.primary:hover,button[aria-pressed=true]:hover{background:var(--purple-dark)}button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid #d8b4fe;outline-offset:3px}.point-button{background:#fff6d8;color:#896018;border:1px solid #f2d98b;white-space:nowrap}.collection-summary{display:flex;align-items:center;gap:28px;padding:16px 18px;border:1px solid var(--line);border-radius:17px;background:linear-gradient(110deg,#faf7ff,#fff9fc);margin-bottom:18px}.collection-summary>div{display:flex;align-items:baseline;gap:8px}.collection-summary strong{font-size:1.3rem;color:var(--purple)}.collection-summary span,.collection-summary>a{font-size:14px;color:var(--muted)}.collection-summary>a{margin-left:auto}.subjects{display:none}.activities{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:0 0 16px}.activities button{padding:10px 4px;font-size:1rem;border:1px solid var(--line);background:#fff;color:var(--muted);min-width:0}.activities button[aria-pressed=true]{background:var(--purple);color:#fff;border-color:var(--purple);box-shadow:0 3px 10px #6d28d925}.session-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 16px;border-radius:14px;background:#faf6e7;color:#826620;margin:14px 0}#progress,#trial-progress{font-weight:700;white-space:nowrap}.han-unit{display:inline-flex;align-items:center;vertical-align:middle;white-space:nowrap;width:1.64em;height:1.2em;margin:.07em 0;flex-shrink:0}.han{width:1em;height:1em;line-height:1;display:flex;align-items:center;justify-content:center}.han>svg{width:1em;height:1em;display:block}.annotation{width:.625em;height:1em;padding:0;display:block}.annotation>svg{width:.625em;height:1em;display:block}.activities .han-unit{width:1.4em}.activities .annotation,.activities .annotation>svg{width:.4em}.question-text,.target-word{font-size:1.7rem;line-height:1.9;text-align:center;color:var(--purple-dark);font-weight:700;margin:20px 0 14px}.target-word{padding:14px 0;min-height:65px}#question-target,#trial-target,#tone-target{font-size:2rem;margin:12px 0}.sound{display:block;margin:10px auto 20px;background:var(--purple)}.options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0}.option{background:#fff;border:2px solid var(--line);color:var(--ink);font-size:1.55rem;min-height:90px;padding:14px 10px;line-height:1.65;overflow-wrap:anywhere}.option:hover{background:#faf7ff;border-color:#bfa2ee}.option.answer{background:#edfaf3;border-color:#64b68e;color:#166534}.option.selected-answer{border-color:var(--purple);background:var(--soft)}.option.selected-wrong{border-color:#e7a4b7;background:#fff4f7}.option.trial-phonetics{display:flex;flex-wrap:wrap;justify-content:center;align-content:center;gap:.3em;font-size:clamp(1.1rem,4.3vw,1.65rem)}.trial-phonetics>span{white-space:nowrap}.writing-head{display:flex;align-items:center;justify-content:center;gap:20px;margin-top:14px}#writing-target{font-size:3.4rem;color:var(--purple-dark);line-height:1.3}#writing-instruction{font-size:1.3rem;margin:12px 0}.board{max-width:380px;aspect-ratio:1;margin:12px auto;border:2px solid #d8cdec;border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 5px 22px #49326e08}canvas{display:block;width:100%;height:100%;touch-action:none;cursor:crosshair}.write-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin:12px 0}.write-actions button{flex:1;max-width:150px;padding:10px 8px}#trial-guide,#writing-guide{display:block;margin:8px auto;background:#fff;border:1px solid #d6c8e9;color:var(--purple);font-size:15px}#trial-guide[aria-pressed=false],#writing-guide[aria-pressed=false]{background:var(--soft)}.feedback{padding:10px 14px;min-height:46px;line-height:1.8;margin:12px 0;text-align:center;font-size:1.1rem;border-radius:13px}.feedback:empty{min-height:0;padding:0}.feedback.success{background:#eefaf4;color:#197346}.feedback.retry{background:#fff3f6;color:#9c3052}.writing-metrics,#metrics{display:flex;justify-content:center;flex-wrap:wrap;gap:20px;margin:12px 0;padding:12px;border-radius:14px;background:var(--soft);color:var(--purple-dark);font-weight:700}.legend{text-align:center;font-size:13px;color:var(--muted)}.blue{color:#2563eb}.red{color:#dc2626}.orange{color:#d97706}.wide{display:block;width:100%;margin:12px 0;max-width:450px;margin-left:auto;margin-right:auto}.note{font-size:15px;line-height:1.8;color:var(--muted);margin:10px 0}.word-controls{padding:16px;border:1px solid var(--line);border-radius:17px;background:#fbfaff}.word-controls label{font-size:14px;color:var(--muted);font-weight:700}.word-controls select{margin-left:10px;padding:8px 10px;border:1px solid #d8cdec;border-radius:10px;background:#fff;color:var(--ink);max-width:100%;min-height:42px}.word-modes{display:flex;overflow-x:auto;gap:6px;margin-top:12px;padding:2px 0 6px}.word-modes button{flex:0 0 auto;min-height:42px;font-size:14px;padding:8px 10px}.word-controls .note{font-size:13px;margin-bottom:0}.pieces,.picker{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:6px;margin:12px 0}.pieces button,.picker button{padding:7px 3px;font-size:1.5rem;min-height:42px;background:#f9f6ee;color:#755915;border:1px solid #eee3c0}.picker button[aria-pressed=true]{background:var(--purple);color:#fff}.builder-actions{display:flex;justify-content:center;gap:8px}#built{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;min-height:60px;gap:8px;background:#fbf9ff;border:1px dashed #c0ace1;border-radius:14px;padding:12px;color:var(--purple);font-size:1.9rem}.tone-card{display:grid;grid-template-columns:1fr 2fr auto;align-items:center;gap:10px;border:1px solid var(--line);background:#fffdf7;border-radius:16px;padding:14px;margin:10px 0}.tone-title{font-size:1.25rem}.tone-example{font-size:1.65rem}.tone-sign{font-size:1.8rem;display:block}.tone-option{display:flex;gap:12px;justify-content:center;align-items:center}.target-char .han{background:#efe6ff;border-radius:5px;color:var(--purple)}#reading-title{font-size:1.7rem;text-align:center;margin:22px 0;line-height:1.9}.reading-story{background:#fffaf0;border:1px solid #eee0b3;border-radius:20px;padding:22px}.reading-story p{font-size:1.3rem;line-height:2.15;margin:10px 0;color:var(--ink)}#reading-options{grid-template-columns:1fr}#reading-options .option{font-size:1.2rem;min-height:65px;text-align:left;padding-left:20px}.review-row{background:#fbf9fe;padding:14px;margin:8px 0;border-radius:13px;line-height:1.9}#exam-score{font-size:3rem;text-align:center;font-weight:700;color:var(--purple)}.wallet-dialog{width:min(600px,calc(100% - 24px));max-height:90svh;overflow:auto;border:1px solid var(--line);border-radius:24px;padding:22px;color:var(--ink);box-shadow:0 20px 80px #39224a30;background:#fff}.wallet-dialog::backdrop{background:#30203e66;backdrop-filter:blur(4px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:8px}.dialog-head h2{margin:0;font-size:1.35rem}.wallet-total{display:flex;align-items:baseline;justify-content:center;gap:14px;margin:18px 0;padding:18px;background:#fff7dc;border-radius:16px}.wallet-total strong{font-size:2.5rem;color:#926522}.reward-card{display:flex;flex-wrap:wrap;gap:10px;align-items:center;border:1px solid var(--line);background:#faf8ff;border-radius:18px;padding:18px;margin:12px 0}.reward-title{font-size:1.15rem;font-weight:700;color:var(--purple-dark);flex-basis:100%}.reward-card label{flex-basis:100%;display:grid;gap:6px;text-align:left;color:var(--muted);font-size:14px}.reward-card input{width:100%;min-width:0;min-height:46px;padding:10px;border:1px solid #d5cce3;border-radius:10px;background:#fff;color:var(--ink);flex-basis:100%}.reward-cost{flex:1;color:var(--muted)}.confirm-actions{display:flex;justify-content:flex-end;gap:10px}.signin-link,.point-signin a{display:inline-block;padding:10px 16px;border-radius:12px;background:var(--purple);color:#fff;text-decoration:none;margin:10px 0}.point-signin{background:#fff9e6;border:1px solid #efdfaa;border-radius:14px;padding:16px}.point-history-row{display:grid;grid-template-columns:1fr auto;gap:6px;padding:12px 0;border-bottom:1px solid var(--line)}.point-history-row small{color:var(--muted);font-size:12px}.earned{color:#197346}.spent{color:#a23558}.parent{max-width:780px;margin:20px auto;color:var(--muted);font-size:14px}.parent summary{cursor:pointer;padding:12px;border-bottom:1px solid var(--line);font-weight:700}.parent p{line-height:1.9;margin:14px 12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:520px){body{padding-left:10px;padding-right:10px;font-size:16px}main{padding:18px 15px;border-radius:23px}header{gap:8px;margin-bottom:14px}h1{font-size:1.2rem}.app-trial h1{font-size:1.05rem}header button{padding:9px 11px;font-size:15px}.app-topline{font-size:12px;margin-bottom:9px}.collection-summary{gap:15px;padding:11px 12px;margin-bottom:14px}.collection-summary>div{display:grid;gap:0}.collection-summary strong{font-size:1.15rem}.collection-summary span,.collection-summary>a{font-size:12px}.activities{gap:6px}.activities button{font-size:14px;min-height:46px}.question-text{font-size:1.45rem;margin:18px 0 10px}.target-word,#question-target,#trial-target,#tone-target{font-size:1.9rem;margin:10px 0;padding:10px 0}.option{min-height:78px;font-size:1.3rem;padding:12px 8px}.options{gap:10px}.note{font-size:14px}.reading-story{padding:15px}.reading-story p{font-size:1.16rem}.pieces,.picker{grid-template-columns:repeat(7,minmax(0,1fr));gap:5px}.pieces button,.picker button{font-size:1.25rem;min-height:40px}.word-controls{padding:12px}.word-modes button{font-size:13px}.word-controls select{font-size:14px;max-width:calc(100% - 78px)}.wallet-dialog{padding:18px}.tone-card{padding:11px}.tone-example{font-size:1.4rem}.tone-title{font-size:1.05rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.learning-buddies{display:flex;align-items:center;gap:14px;padding:4px 12px;margin:4px 0 16px;border-radius:16px;background:linear-gradient(100deg,#fff4f9,#fff9df);color:var(--purple-dark)}.learning-buddies img{flex:0 0 64px;width:64px;height:64px;object-fit:contain}.learning-buddies span{font-size:15px;font-weight:700;line-height:1.8}.celebration-buddies{display:block;width:110px;height:110px;object-fit:contain;margin:16px auto 0}.feedback.success:not(:empty){background-image:url('./learning-buddies.png');background-repeat:no-repeat;background-size:50px 50px;background-position:right 10px center;min-height:66px;padding-right:70px;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:3px}.learning-buddies img,.celebration-buddies{animation:buddy-arrive .45s ease-out both}@keyframes buddy-arrive{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@media(max-width:520px){.learning-buddies{gap:10px;padding:3px 10px;margin-bottom:12px}.learning-buddies img{width:56px;height:56px;flex-basis:56px}.learning-buddies span{font-size:14px}.feedback.success:not(:empty){background-size:42px 42px;padding-right:58px;min-height:58px}}@media(prefers-reduced-motion:reduce){.learning-buddies img,.celebration-buddies{animation:none}}

.study-group{padding:1rem;border:1px solid #c4b5fd;border-radius:1rem;margin:.75rem 0}.study-group p{margin:.5rem 0}#study-mistakes .review-row{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem}#study-summary{font-size:1.1rem;font-weight:600}

.learning-buddies img,.celebration-buddies{animation:none}#app-loading{color:var(--purple-dark);padding:10px 12px;background:var(--soft);border-radius:12px}