:root{color-scheme:light dark;--bg:#f5f7fb;--surface:#fff;--soft:#eef0fb;--ink:#1d2330;--muted:#667085;--line:#dfe3ee;--accent:#5653cf;--tint:#ebeafe;--shadow:0 12px 48px #29286418;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","PingFang SC","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,select{font:inherit}button{cursor:pointer;color:inherit}button:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button{touch-action:manipulation}button:disabled{cursor:default;opacity:.65}button,input,select{-webkit-tap-highlight-color:transparent}button:active:not(:disabled){filter:brightness(.95)}[hidden]{display:none!important}.app{width:100%;max-width:520px;min-height:100svh;margin:auto;background:var(--bg)}.app-head{height:72px;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:8px;border-bottom:1px solid var(--line);background:var(--surface)}#screen-title{font-weight:600;font-size:18px}.voice{border:0;background:var(--tint);color:var(--accent);border-radius:30px;min-height:42px;padding:8px 12px;font-size:12px}.voice[data-playing=true]{background:var(--accent);color:#fff}main{padding:24px 22px 116px}main:focus{outline:none}h1,h2,p{margin:0}h1{font-size:29px;letter-spacing:-.6px;font-weight:650;line-height:1.25;margin:10px 0}h2{font-size:18px;font-weight:600}.eyebrow{font-size:12px;color:var(--accent);font-weight:500;letter-spacing:.03em}.muted{color:var(--muted);line-height:1.65;font-size:14px}.exam-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}.exam-select{position:relative}.exam-select select{appearance:none;color:var(--accent);border:1px solid var(--line);background:var(--surface);border-radius:10px;min-height:44px;padding:9px 30px 9px 12px;font-size:13px;font-weight:500}.exam-select:after{content:'⌄';position:absolute;right:12px;top:12px;pointer-events:none;color:var(--accent)}.demo-tag{font-size:11px;color:var(--muted);border:1px solid var(--line);padding:5px 8px;border-radius:6px}.story-heading{margin-bottom:22px}.story-heading .english-title{font-size:12px;color:var(--muted);margin:6px 0 12px}.plan{border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:17px;margin-bottom:24px}.plan-top{display:flex;align-items:center;justify-content:space-between;font-size:14px}.plan-top strong{font-size:20px}.count{color:var(--accent);font-size:13px}.track{height:6px;border-radius:8px;background:var(--soft);margin:14px 0 11px;overflow:hidden}.track span{display:block;height:100%;background:var(--accent);border-radius:8px}.plan-note{display:flex;justify-content:space-between;gap:8px;font-size:11px;color:var(--muted)}.section-label{font-size:12px;color:var(--muted);margin-bottom:10px}.mode-list{display:grid;gap:11px}.mode{display:grid;grid-template-columns:42px 1fr 12px;gap:13px;align-items:center;width:100%;padding:17px 14px;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:17px}.mode:hover{border-color:var(--accent)}.mode-icon{width:42px;height:44px;display:grid;place-items:center;border-radius:12px;background:var(--tint);color:var(--accent);font-weight:500;font-size:18px}.mode strong{display:block;font-size:15px;font-weight:600;margin-bottom:5px}.mode small{color:var(--muted);font-size:12px}.chevron{color:var(--muted);font-size:23px}.footer-note{font-size:11px;line-height:1.8;color:var(--muted);margin-top:22px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);max-width:520px;width:100%;display:grid;grid-template-columns:1fr 1fr;padding:8px 20px max(12px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--surface);z-index:10}.bottom-nav button{border:0;background:none;min-height:48px;color:var(--muted);font-size:13px;display:flex;align-items:center;justify-content:center;gap:7px}.bottom-nav button>span:first-child{font-size:20px}.bottom-nav button[aria-current]{color:var(--accent);font-weight:600}#vocab-count{font-size:11px}.back{background:none;border:0;color:var(--muted);padding:0;min-height:44px;margin:-12px 0 8px;font-size:13px}.study-tools{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 12px}.chip,.secondary{border:1px solid var(--line);background:var(--surface);border-radius:12px;min-height:44px;padding:9px 13px;font-size:13px}.chip[aria-pressed=true]{background:var(--accent);color:#fff;border-color:var(--accent)}.recall-direction{display:flex;gap:10px;align-items:center;font-size:12px;color:var(--muted);margin:12px 0}.recall-direction select{max-width:100%;color:var(--ink);padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:8px}.story-card{margin-top:16px;border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:20px;font-size:17px;line-height:2}.story-card p+p{margin-top:20px}.word{display:inline;border:0;border-radius:6px;padding:3px 5px;background:var(--tint);color:var(--accent);font-size:inherit;line-height:inherit}.word.blank{font-size:13px;min-width:78px}.english-copy{font-size:18px;line-height:1.9}.lookup{border:0;background:none;padding:0;color:var(--accent);font-size:inherit;text-decoration:underline dotted;text-underline-offset:5px;line-height:inherit}.sentence-block{margin-top:14px;padding:17px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.sentence{width:100%;text-align:left;border:0;background:none;padding:0}.sentence-en{display:block;font-size:17px;line-height:1.75}.translation{display:block;border-top:1px solid var(--line);padding-top:12px;margin-top:12px;color:var(--muted);font-size:14px;line-height:1.8}.sentence-hint{display:block;font-size:11px;color:var(--accent);margin-top:12px}.sentence-footer{display:flex;justify-content:space-between;align-items:center;margin-top:12px;font-size:11px;color:var(--muted)}.audio-small{border:0;background:var(--soft);border-radius:9px;min-height:40px;padding:7px 11px;color:var(--accent);font-size:12px}.primary{border:1px solid var(--accent);border-radius:12px;background:var(--accent);color:#fff;min-height:46px;padding:10px 14px;font-size:13px}.wide{width:100%;margin-top:16px}.word-card{position:fixed;bottom:88px;left:50%;transform:translateX(-50%);z-index:20;width:calc(100% - 24px);max-width:496px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:22px;box-shadow:0 0 0 6px var(--bg),var(--shadow);max-height:55svh;overflow:auto}.word-card h2{font-size:24px}.word-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}.close{background:var(--soft);border:0;border-radius:50%;width:36px;height:36px;min-width:36px;font-size:22px;line-height:1}.phonetic{color:var(--muted);font-size:13px;margin:6px 0 10px}.word-meaning{font-size:15px;margin-bottom:14px}.word-example{font-size:12px;line-height:1.7;color:var(--muted);margin-bottom:16px}.word-actions{display:flex;gap:8px;flex-wrap:wrap}.word-actions .primary{flex:1}.vocab-item{padding:18px;border:1px solid var(--line);border-radius:18px;background:var(--surface);margin-top:14px}.vocab-item .word-actions{margin-top:14px}.vocab-item p{margin-top:10px;font-size:13px;line-height:1.75;color:var(--muted)}.vocab-item .meaning{color:var(--ink);font-size:14px}.empty{padding:60px 12px;text-align:center}.empty-icon{color:var(--accent);font-size:36px;margin-bottom:18px}.empty h2{margin-bottom:10px}.empty .primary{margin-top:24px}#toast{position:fixed;bottom:calc(100px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);z-index:30;max-width:90%;width:max-content;background:var(--ink);color:var(--surface);border-radius:12px;font-size:13px;line-height:1.6;padding:10px 16px;pointer-events:none;box-shadow:var(--shadow)}#toast:empty{display:none}.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(min-width:600px){body{padding:30px 0}.app{border:1px solid var(--line);border-radius:24px;overflow:hidden;min-height:calc(100svh - 60px);box-shadow:var(--shadow)}.bottom-nav{bottom:0;border:1px solid var(--line);border-bottom:0;border-radius:18px 18px 0 0}main{padding:28px 28px 116px}.app-head{padding:12px 28px}}
@media(max-width:360px){main{padding:20px 16px 116px}.app-head{padding:12px 16px}#screen-title{font-size:16px}.voice{font-size:11px;padding:7px 9px}.mode{gap:10px;padding:15px 12px}.mode strong{font-size:14px}.plan-note{font-size:10px}}
@media(prefers-color-scheme:dark){:root{--bg:#111318;--surface:#1c1f27;--soft:#262938;--ink:#f5f6fa;--muted:#aeb5c5;--line:#363b49;--accent:#aaa8ff;--tint:#302f57;--shadow:0 12px 48px #0006}.primary,.chip[aria-pressed=true],.voice[data-playing=true]{color:#171538;background:var(--accent)}}
@media(prefers-reduced-motion:no-preference){.mode,.chip{transition:background .15s,border-color .15s}.track span{transition:width .2s}}

.word-unit{white-space:nowrap}