:root{
  --bg:#0b1020; --bg2:#141a32; --card:#1b2244; --line:#283166;
  --text:#e8ecff; --sub:#9aa3d4; --accent:#ffd957; --good:#43d39e; --bad:#ff6b81; --ok:#7aa2ff;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font:16px/1.45 -apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC",Helvetica,Arial,sans-serif;
  overscroll-behavior:none}
body{padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select{font:inherit;color:inherit}

#topbar{display:flex;justify-content:space-between;align-items:center;
  padding:12px 16px;background:var(--bg2);position:sticky;top:0;z-index:10;
  border-bottom:1px solid var(--line)}
#topbar .title{font-weight:700;letter-spacing:.5px}
#topbar .streak{background:var(--card);padding:4px 10px;border-radius:99px;color:var(--accent);font-weight:600}

.screen{display:none;padding:16px;max-width:520px;margin:0 auto}
.screen.active{display:block}

.push-prompt{background:#1c2a4d;border:1px solid var(--ok);color:var(--text);
  padding:12px 14px;border-radius:14px;margin-bottom:14px;text-align:center;font-size:13px;display:flex;flex-direction:column;gap:8px}
.push-prompt button{background:var(--ok);color:#0b1020;border:0;border-radius:99px;
  padding:8px 18px;font-weight:700;font-size:14px;cursor:pointer}

.done-banner{background:linear-gradient(135deg,#143a2c,#1e5a44);border:1px solid #1e5a44;color:#a6f5d3;
  padding:12px 14px;border-radius:14px;margin-bottom:14px;text-align:center;font-weight:600;font-size:14px}
.due-banner{background:#3a2410;border:1px solid #5a3a14;color:#f5c780;
  padding:10px 14px;border-radius:14px;margin-bottom:14px;text-align:center;font-size:13px}

.today-card{background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:18px;margin-bottom:18px;box-shadow:var(--shadow)}
.today-label{color:var(--sub);font-size:13px;margin-bottom:6px}
.today-progress{font-size:44px;font-weight:800;line-height:1}
.today-progress .slash,.today-progress .unit{color:var(--sub);font-weight:500;font-size:24px;margin-left:4px}
.bar{height:8px;background:#0e1430;border-radius:99px;margin:14px 0 10px;overflow:hidden}
.bar-fill{height:100%;background:linear-gradient(90deg,var(--ok),var(--good));width:0%;transition:width .3s}
.sub{display:flex;gap:14px;color:var(--sub);font-size:13px;flex-wrap:wrap}
.sub b{color:var(--text)}

.cta{display:block;width:100%;padding:16px;margin:8px 0;border-radius:14px;
  background:var(--card);border:1px solid var(--line);text-align:center;font-size:17px;font-weight:600}
.cta.primary{background:linear-gradient(135deg,#3b5bff,#7aa2ff);border-color:transparent;color:white;font-size:19px}
.cta.ghost{background:transparent}
.cta.danger{background:#3a1320;border-color:#5a1e30;color:var(--bad)}
.hint{color:var(--sub);font-size:12px;text-align:center;margin-top:10px}

.learn-top{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px}
.lvl-pill{background:var(--card);padding:6px 12px;border-radius:99px;color:var(--sub);font-size:13px;border:1px solid var(--line)}
.lvl-pill.big{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 16px;line-height:1.2;cursor:pointer}
.lvl-pill.big .line1{color:var(--text);font-weight:700;font-size:14px}
.lvl-pill.big .line2{color:var(--sub);font-size:11px}
.lvl-pill.big:active{transform:scale(.97)}

.lvl-strip{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin:0 0 14px}
.lvl-strip .item{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:8px 4px;text-align:center;font-size:11px;cursor:pointer}
.lvl-strip .item .lv{color:var(--accent);font-weight:700;font-size:13px}
.lvl-strip .item .pct{color:var(--sub);font-size:10px;margin-top:2px}
.lvl-strip .item .bar2{height:4px;background:#0e1430;border-radius:99px;margin-top:4px;overflow:hidden}
.lvl-strip .item .bar2 .f{height:100%;background:linear-gradient(90deg,var(--ok),var(--good))}
.lvl-strip .item.active{border-color:var(--accent)}

.chapter-section{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;margin-bottom:10px}
.chapter-section .head{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px}
.chapter-section .head .name{font-weight:700;font-size:16px}
.chapter-section .head .progress{color:var(--sub);font-size:13px}
.chapter-section .actions{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.chapter-section .actions button{flex:1;min-width:110px;padding:8px;background:#0e1430;border:1px solid var(--line);border-radius:8px;font-size:12px;color:var(--text)}
.chapter-section .actions button.primary{background:#1a2a5f;border-color:var(--ok);color:var(--text)}
.chapter-section .word-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:4px;max-height:220px;overflow-y:auto;padding:4px;background:#0e1430;border-radius:8px}
.chapter-section .word-grid button{padding:6px 4px;background:transparent;border:1px solid transparent;border-radius:6px;font-size:12px;text-align:left;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chapter-section .word-grid button.mastered{color:var(--good);font-weight:700}    /* 已熟練 - 粗綠 */
.chapter-section .word-grid button.good{color:#7ee787}                            /* 認識了 - 淺綠 */
.chapter-section .word-grid button.okay{color:var(--accent)}                      /* 有印象 - 黃 */
.chapter-section .word-grid button.wrong-recent{color:var(--bad)}                 /* 不熟 - 紅 */
.chapter-section .word-grid button.done{color:var(--good);opacity:.6}
.chapter-section .word-grid button.due{color:var(--accent)}
.chapter-section .word-grid button.weak{color:var(--bad)}
.chapter-section .word-grid button:hover,.chapter-section .word-grid button:active{background:var(--card);border-color:var(--ok)}

.review-modes{display:grid;gap:10px}
.review-mode{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;cursor:pointer;text-align:left}
.review-mode .title{font-weight:700;font-size:16px;margin-bottom:4px}
.review-mode .desc{color:var(--sub);font-size:12px}
.review-mode .count{display:inline-block;margin-top:6px;background:#0e1430;color:var(--accent);padding:2px 8px;border-radius:99px;font-size:12px}
.review-mode:active{transform:scale(.99)}

.summary-score{text-align:center;font-size:32px;font-weight:800;margin:14px 0 18px;color:var(--accent)}
.summary-score span{color:var(--text)}
.summary-actions{display:flex;flex-direction:column;gap:8px;margin-bottom:18px}
.summary-section{margin-bottom:18px}
.summary-h{color:var(--sub);font-size:13px;margin:8px 0;font-weight:600;text-transform:none}
.summary-list{display:flex;flex-direction:column;gap:4px}
.summary-list .summary-row{display:flex;justify-content:space-between;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:14px;cursor:pointer}
.summary-list .summary-row .w{font-weight:700}
.summary-list .summary-row .cn{color:var(--sub)}
.summary-list .summary-row.wrong{border-color:#5a1e30;background:#2a1018}
.summary-list .summary-row.wrong .w{color:var(--bad)}
.summary-list .summary-row.right{border-color:#1e5a44;background:#0e2418}
.summary-list .summary-row.right .w{color:var(--good)}

.stats-week-summary{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:14px;text-align:center}
.stats-week-summary .big{font-size:36px;font-weight:800;color:var(--accent)}
.stats-week-summary .sub{color:var(--sub);margin-top:4px;font-size:13px}
.stats-day{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px}
.stats-day.empty{opacity:.5}
.stats-day .day-head{display:flex;justify-content:space-between;font-size:14px;font-weight:600}
.stats-day .day-head .d{color:var(--text)}
.stats-day .day-head .cnt{color:var(--sub);font-size:12px;font-weight:400}
.stats-day .sess{font-size:12px;color:var(--sub);margin-top:4px;padding-left:12px}
.stats-day .acc-bar{height:4px;background:#0e1430;border-radius:99px;margin:6px 0;overflow:hidden}
.stats-day .acc-bar .f{height:100%;background:linear-gradient(90deg,var(--bad),var(--accent),var(--good))}
.iconbtn{padding:8px 12px;background:var(--card);border-radius:12px;font-size:18px;min-width:44px;min-height:44px}

.card{background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:22px 18px;box-shadow:var(--shadow);min-height:60vh}
.card .emoji{font-size:64px;text-align:center;line-height:1}
.card .emoji-desc{text-align:center;color:var(--sub);font-size:14px;margin-top:8px;padding:0 16px;font-style:italic;min-height:18px}
.card .emoji-desc:empty{display:none}

/* 點哪念哪：每個區塊都可點 */
.card .emoji, .card .emoji-desc, .card .word, .card .ipa, .card .pos, .card .cn,
.card .block, .related-list .chip { cursor:pointer; -webkit-touch-callout:none; user-select:none }
.card .emoji:active, .card .emoji-desc:active, .card .word:active, .card .ipa:active, .card .pos:active, .card .cn:active,
.card .block:active, .related-list .chip:active { opacity:.65; transition:opacity .1s }
.card .word{font-size:42px;font-weight:800;text-align:center;margin-top:8px;word-break:break-word}
.card .ipa{text-align:center;color:var(--sub);font-size:18px;margin-top:4px}
.card .pos{text-align:center;color:var(--accent);margin-top:6px;font-size:14px;letter-spacing:1px}
.card .cn{text-align:center;font-size:22px;margin-top:10px;font-weight:600}
.card hr{border:0;border-top:1px dashed var(--line);margin:18px 0}
.block{margin:14px 0}
.block .label{color:var(--sub);font-size:12px;text-transform:uppercase;letter-spacing:1px;margin-bottom:4px}
.block .en{font-size:17px;line-height:1.5}
.block .zh{color:var(--sub);font-size:14px;margin-top:2px}
.examples-list{display:flex;flex-direction:column;gap:10px}
.example{background:#0e1430;border:1px solid var(--line);border-radius:10px;padding:10px 12px;cursor:pointer}
.example .en{font-size:15px;line-height:1.5;color:var(--text)}
.example .zh{color:var(--sub);font-size:13px;margin-top:2px}
.example .img-emoji{font-size:22px;margin-top:6px;text-align:center;letter-spacing:6px}
.example:active{opacity:.7}
.phrases-using-list{display:flex;flex-direction:column;gap:6px}
.phrases-using-list .phrase-card{background:#0e1430;border:1px solid var(--line);border-radius:10px;padding:8px 10px;cursor:pointer}
.phrases-using-list .phrase-card .head{display:flex;justify-content:space-between;gap:8px;align-items:baseline;font-size:13px}
.phrases-using-list .phrase-card .head .w{font-weight:700;color:var(--text)}
.phrases-using-list .phrase-card .head .cn{color:var(--sub);font-size:12px;text-align:right;max-width:55%}
.phrases-using-list .phrase-card .ex{margin-top:4px;padding-top:4px;border-top:1px dashed #1f2a55;font-size:12px}
.phrases-using-list .phrase-card .ex .en{color:var(--text);opacity:.85;line-height:1.4}
.phrases-using-list .phrase-card .ex .zh{color:var(--sub);font-size:11px;margin-top:2px}
.phrases-using-list .phrase-card .ex .em{font-size:14px;margin-top:2px;letter-spacing:4px}
.phrases-using-list .phrase-card:active{opacity:.7}
.card.audio{min-height:auto;text-align:center}
.related-list{display:flex;flex-wrap:wrap;gap:6px}
.related-list .chip{background:#0e1430;border:1px solid var(--line);border-radius:99px;
  padding:6px 10px;font-size:13px;color:var(--text);display:inline-flex;gap:6px;align-items:center}
.related-list .chip .cn{color:var(--sub);font-size:12px}
.related-list:empty::before,.block:has(>div:empty):not(:has(.related-list)) {display:none}

.grade-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:14px;
  position:sticky;bottom:8px}
.grade{padding:14px 6px;border-radius:14px;font-weight:700;font-size:14px;
  background:var(--card);border:1px solid var(--line)}
.grade span{display:block;font-weight:400;color:var(--sub);font-size:11px;margin-top:2px}
.grade.bad{background:#3a1320;border-color:#5a1e30;color:var(--bad)}
.grade.ok{background:#1c2a4d;border-color:#2c3f6f;color:var(--ok)}
.grade.good{background:#143a2c;border-color:#1e5a44;color:var(--good)}
.grade:active{transform:scale(.97)}

.audio-ctrls{margin-top:16px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center}
.audio-ctrls button{padding:12px 18px;background:var(--card);border-radius:14px;font-size:20px;min-width:60px}
.audio-ctrls label{font-size:12px;color:var(--sub);display:flex;flex-direction:column;align-items:center;gap:4px}
.audio-ctrls input[type=range]{width:140px}

.quiz-stem{font-size:42px;font-weight:800;text-align:center;margin:30px 0 6px;word-break:break-word}
.quiz-sub{text-align:center;color:var(--sub);margin-bottom:18px}
.quiz-choices{display:grid;gap:10px}
.quiz-choices button{padding:16px;background:var(--card);border:1px solid var(--line);
  border-radius:14px;text-align:left;font-size:16px}
.quiz-choices button.right{background:#143a2c;border-color:#1e5a44}
.quiz-choices button.wrong{background:#3a1320;border-color:#5a1e30}
.quiz-score{text-align:center;color:var(--sub);margin-top:14px}

#searchBox{flex:1;padding:10px 14px;background:var(--card);border:1px solid var(--line);
  border-radius:12px;color:var(--text);min-height:40px}
.lvl-filter{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.lvl-filter button{padding:6px 12px;background:var(--card);border:1px solid var(--line);border-radius:99px;font-size:13px;color:var(--sub)}
.lvl-filter button.active{background:var(--accent);color:#1a1300;border-color:transparent}
.browse-list{display:flex;flex-direction:column;gap:6px;margin-top:8px}
.browse-row{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px;
  display:flex;justify-content:space-between;gap:10px;align-items:center}
.browse-row .w{font-weight:700}
.browse-row .ipa{color:var(--sub);font-size:12px}
.browse-row .cn{color:var(--sub);font-size:14px;max-width:55%;text-align:right}
.browse-row .badge{background:#0e1430;color:var(--sub);font-size:11px;padding:2px 6px;border-radius:6px;margin-left:6px}

.settings-list{display:flex;flex-direction:column;gap:14px}
.settings-list label{display:flex;flex-direction:column;gap:6px;color:var(--sub);font-size:13px}
.settings-list input,.settings-list select{padding:10px 12px;background:var(--card);border:1px solid var(--line);
  border-radius:10px;color:var(--text)}
.settings-list small{color:var(--sub);font-size:11px}
.settings-list hr{border:0;border-top:1px solid var(--line);margin:10px 0}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(40px);
  background:var(--card);border:1px solid var(--line);padding:10px 16px;border-radius:99px;
  opacity:0;transition:all .25s;z-index:99;font-size:14px}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}