/* 手機優先：iPhone 寬度、大按鈕、底部分頁 */
:root{--blue:#2f6fed;--g:#1f9d55;--y:#e0a400;--r:#d93838;--bg:#f6f8fc;--ink:#1d2433;--mute:#6b7385;--card:#fff}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 -apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC",sans-serif;-webkit-text-size-adjust:100%}
main{max-width:520px;margin:0 auto;padding:calc(env(safe-area-inset-top) + 14px) 16px calc(env(safe-area-inset-bottom) + 96px)}
main:has(#practice){padding-bottom:calc(env(safe-area-inset-bottom) + 190px)}
h1{font-size:26px;margin:6px 0 14px}
.muted{color:var(--mute);font-size:15px}.center{text-align:center}.err{color:var(--r)}.ok{color:var(--g);font-weight:600}
button,.btn,.big{font:inherit;border:0;border-radius:14px;cursor:pointer;-webkit-tap-highlight-color:transparent}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:8px 12px;background:#e8edf8;color:var(--ink);font-size:15px;text-align:center}
.big{min-height:60px;padding:12px 16px;font-size:19px;font-weight:600;background:#e8edf8;color:var(--ink);flex:1}
.primary{background:var(--blue);color:#fff}
.block{display:flex;align-items:center;justify-content:center;width:100%;margin:10px 0 16px;text-decoration:none}
button:disabled{opacity:.4}
.field{width:100%;font:inherit;padding:12px 14px;border:1.5px solid #d5dbe8;border-radius:12px;background:#fff;margin:6px 0}
.text{min-height:220px;font-size:18px;line-height:1.6}
.row3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:8px 0}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}
.panel{background:var(--card);border-radius:16px;padding:14px;margin:10px 0;box-shadow:0 1px 4px #0001}
.status{min-height:1.4em;color:var(--mute);font-size:15px;margin:4px 0}.status.busy::before{content:"⏳ "}
mark{background:#ffe58a;border-radius:4px;padding:0 3px}
.flag{border-top:1px solid #eee;padding:10px 0}.flag small{display:block;color:var(--mute)}
.preview{background:#fafbfe;border-radius:10px;padding:10px;font-size:16px}
.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{background:#eef3ff;border-radius:999px;padding:6px 12px;font-weight:600}.chip small{font-weight:400;color:var(--mute);margin-left:6px}
.pattern code{background:#f1f3f8;padding:2px 6px;border-radius:6px}
.card{display:block;background:var(--card);border-radius:16px;padding:14px 16px;margin:10px 0;box-shadow:0 1px 4px #0001;color:inherit;text-decoration:none}
.card small{display:block;color:var(--mute)}
.login{text-align:center;padding-top:12vh}.login .logo{font-size:64px}.login form{display:grid;gap:10px;margin-top:20px}
.interim{background:#fff5d6;border:1px solid #f0d27a;color:#6b5200;border-radius:12px;padding:8px 12px;font-size:14px;margin-bottom:8px}
.segs{display:grid;grid-template-columns:repeat(3,1fr);background:#e3e8f3;border-radius:14px;padding:4px;gap:4px}
.seg{min-height:46px;background:transparent;font-size:17px;font-weight:600;color:var(--mute);border-radius:11px}.seg.on{background:#fff;color:var(--blue);box-shadow:0 1px 3px #0002}
.rates{display:flex;align-items:center;gap:6px;margin:12px 0}.rate{flex:1;min-height:40px;background:#fff;border:1.5px solid #d5dbe8;font-size:15px;border-radius:10px}.rate.on{border-color:var(--blue);color:var(--blue);font-weight:700}
.nav{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:15px;color:var(--mute)}
.words{font-size:24px;line-height:1.9;margin:0}
.w{border-radius:8px;padding:1px 3px;transition:background .2s}
.w[role=button]{cursor:pointer;text-decoration:underline dotted #b7c0d6;text-underline-offset:6px}
.w.green{background:#d8f3e2;color:#0d6b37}.w.yellow{background:#fff0bf;color:#7a5a00}.w.red{background:#ffd9d9;color:#a01818}
.w.sel{outline:3px solid var(--blue)}
.zh{color:var(--mute);font-size:16px;margin:8px 0 0}
.whole .sent{background:var(--card);border-radius:14px;padding:10px 14px;margin:8px 0}.whole .words{font-size:20px}.whole .para{margin-bottom:14px}
.wordcard{background:var(--card);border-radius:16px;padding:18px;text-align:center;margin:10px 0;border:3px solid transparent}
.wordcard.green{border-color:var(--g)}.wordcard.yellow{border-color:var(--y)}.wordcard.red{border-color:var(--r)}
.big-word{font-size:40px;font-weight:700}.ipa{font-size:20px;color:var(--blue);font-family:"Lucida Sans Unicode","Arial Unicode MS",sans-serif}
.score{display:flex;align-items:baseline;gap:8px;margin-top:14px}.score b{font-size:44px}.tag{background:#fff0bf;color:#7a5a00;border-radius:6px;padding:1px 6px;font-size:12px;margin-left:6px}
.legend{margin-left:auto;font-size:15px}.legend i{display:inline-block;width:12px;height:12px;border-radius:50%;margin:0 3px 0 8px}.legend .g{background:var(--g)}.legend .y{background:var(--y)}.legend .r{background:var(--r)}
.tip h3{margin:0 0 6px;font-size:24px}
.actions{position:fixed;left:0;right:0;bottom:calc(env(safe-area-inset-bottom) + 64px);display:flex;gap:10px;padding:10px 16px;max-width:520px;margin:0 auto;background:linear-gradient(transparent,var(--bg) 30%)}
.rec{background:var(--r);animation:pulse 1.2s infinite}@keyframes pulse{50%{opacity:.75}}
@media (prefers-reduced-motion:reduce){.rec{animation:none}}
.tabs{position:fixed;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(3,1fr);background:#fff;border-top:1px solid #e3e6ee;padding-bottom:env(safe-area-inset-bottom)}
.tab{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:62px;color:var(--mute);text-decoration:none;font-size:13px}.tab span{font-size:22px}.tab.on{color:var(--blue);font-weight:700}
.attempts{list-style:none;padding:0}.attempts li{background:#fff;border-radius:12px;padding:10px 14px;margin:8px 0}.attempts b{font-size:22px}.attempts small{color:var(--mute);margin-left:8px}.tgt{color:var(--mute);font-size:14px}