:root{--paper:#f7f5ef;--surface:#fffefa;--ink:#203c34;--muted:#63766e;--line:#dedfd5;--green:#235e50;--pale:#e5eee4;--orange:#f0cb8b;--bad:#9c4038;--bad-bg:#fbebe5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 'Avenir Next','PingFang SC','Microsoft YaHei',sans-serif;-webkit-tap-highlight-color:transparent}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);background:var(--surface);color:var(--ink);min-height:48px;border-radius:12px;padding:10px 16px;font-weight:600}button:disabled{cursor:default}button:active:not(:disabled){transform:translateY(1px)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #d6942f;outline-offset:3px}.shell{max-width:640px;margin:auto;padding:0 22px calc(112px + env(safe-area-inset-bottom))}header{display:flex;justify-content:space-between;align-items:center;padding:calc(25px + env(safe-area-inset-top)) 0 25px;gap:8px}header a{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none;font-size:17px;font-weight:750}small{display:block;color:var(--muted);font-size:11px;letter-spacing:.5px;font-weight:400}.brandmark{display:grid;place-items:center;width:39px;height:43px;border-radius:7px 12px 12px 7px;color:var(--paper);background:var(--green);font-family:Georgia,serif;font-size:23px}.grade{font-size:11px;border:1px solid #cfd7cb;border-radius:30px;white-space:nowrap;padding:5px 9px;color:var(--green)}.eyebrow{font-size:12px;letter-spacing:1.8px;text-transform:uppercase;color:var(--muted);margin:13px 0 5px}h1{font-size:30px;line-height:1.4;font-weight:750;letter-spacing:-1px;margin:0 0 10px}h2{font-size:20px;line-height:1.4;margin:0 0 12px}p{margin:0 0 14px}.muted{color:var(--muted);font-size:14px}.today{margin:25px 0 22px;background:var(--green);color:#fffdf3;padding:23px;border-radius:20px;position:relative;overflow:hidden}.today .eyebrow,.today .muted{color:#d2e3d4}.today h2{font-size:24px;margin:4px 0}.today button{background:#f3cf8d;border:0;color:#2d4435;width:100%;margin-top:20px}.today .progress{background:#48796b}.progress{height:6px;background:#e1e5db;border-radius:10px;overflow:hidden;margin:15px 0 9px}.progress span{display:block;height:100%;width:var(--progress,0%);background:#f3cf8d;border-radius:inherit}.metrics{display:flex;gap:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:16px 0;margin-bottom:24px}.metrics div{flex:1}.metrics div+div{border-left:1px solid var(--line);padding-left:18px}.metrics strong{font-size:21px}.metrics span{display:block;font-size:12px;color:var(--muted)}.action-line{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:16px 0;border-bottom:1px solid var(--line)}.action-line h2{font-size:17px;margin:0}.action-line p{font-size:12px;color:var(--muted);margin:4px 0 0}.action-line button{flex-shrink:0;padding:8px 12px;font-size:13px;min-height:44px}.note{font-size:12px;color:var(--muted);margin:22px 0;line-height:1.8}.section-top{display:flex;justify-content:space-between;align-items:center;margin:6px 0 16px}.section-top button{min-height:44px;padding:6px 10px;font-size:13px}.card{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:27px 22px;margin:16px 0 20px;min-height:310px;display:flex;flex-direction:column;justify-content:center}.category{font-size:12px;color:var(--muted);letter-spacing:1px}.english{font:700 clamp(31px,9vw,46px)/1.2 Georgia,'Times New Roman',serif;letter-spacing:-1px;overflow-wrap:anywhere;margin:18px 0}.sound{background:var(--pale);border:0;align-self:flex-start;font-size:13px;min-height:44px;padding:8px 14px}.meaning{font-size:22px;font-weight:650;margin:23px 0 8px}.example{font-family:Georgia,'Times New Roman',serif;font-size:18px;line-height:1.6;margin:18px 0 5px}.translation{color:var(--muted);font-size:14px}.reveal{margin-top:30px;border-style:dashed;background:transparent;width:100%;color:var(--muted)}.buttons{display:flex;gap:12px}.buttons button{flex:1}.primary{background:var(--green);color:white;border-color:var(--green)}.soft{background:var(--pale);border-color:var(--pale)}.full{width:100%}.quiz-options{display:grid;gap:11px;margin-top:22px}.quiz-options button{text-align:left;padding:14px 17px;min-height:58px}.quiz-options .correct{background:var(--pale);border-color:var(--green);color:var(--green)}.quiz-options .wrong{background:var(--bad-bg);border-color:var(--bad);color:var(--bad)}.quiz-options button:disabled{opacity:1}.feedback{margin:18px 0;border:1px solid var(--line);border-radius:12px;padding:15px}.feedback p{font-size:14px;margin:0 0 8px}.search{width:100%;min-height:48px;border:1px solid var(--line);border-radius:12px;padding:12px;background:var(--surface);color:var(--ink);margin:8px 0 12px}.filter{width:100%;min-height:48px;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px;color:var(--ink);margin-bottom:14px}.word-row{display:flex;justify-content:space-between;gap:16px;padding:15px 0;border-bottom:1px solid var(--line);align-items:center}.word-row strong{display:block;font:700 22px/1.4 Georgia,serif}.word-row p{font-size:14px;margin:3px 0;color:var(--muted)}.word-row button{font-size:12px;min-width:55px;padding:8px}.word-row small{font-size:11px}.empty{padding:38px 8px;text-align:center}.empty h2{font-size:25px}.score{font:700 64px/1.2 Georgia,serif;margin:25px 0 10px}.settings-group{margin:20px 0;background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:17px}.settings-group label{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:8px 0}.settings-group select{min-height:44px;background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:6px 8px;max-width:55%}.settings-group p,.settings-group ol{font-size:14px;color:var(--muted);line-height:1.9}.settings-group ol{padding-left:22px;margin-bottom:0}nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);max-width:640px;width:100%;display:flex;justify-content:space-around;border-top:1px solid var(--line);background:var(--paper);padding:9px 10px calc(8px + env(safe-area-inset-bottom));z-index:10}nav button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:11px;border:none;background:transparent;color:var(--muted);width:22%;padding:5px 0;min-height:53px;border-radius:10px;font-weight:400}nav button span{font-size:23px;font-family:Georgia,serif;line-height:1.2}nav button[aria-current=page]{background:var(--pale);color:var(--green);font-weight:700}#notice:not(:empty){position:fixed;bottom:calc(92px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);width:min(90%,550px);padding:12px 16px;border-radius:12px;background:#243d34;color:white;z-index:20;font-size:14px}.offline{font-size:12px;color:var(--muted);margin:10px 0}#install-help{margin-top:18px}a{color:var(--green)}@media(min-width:600px){.shell{padding-left:36px;padding-right:36px}.today{margin-top:30px}h1{font-size:34px}.card{padding:35px;min-height:340px}}@media(max-width:359px){.shell{padding-left:16px;padding-right:16px}header small{font-size:9px}.grade{display:none}h1{font-size:27px}.buttons{gap:7px}.buttons button{font-size:14px;padding:10px 8px}}