:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;color-scheme:light dark;--bg:light-dark(#f5f6f0,#17201e);--paper:light-dark(#fff,#222d29);--ink:light-dark(#213f38,#e2eee7);--soft:light-dark(#5d7168,#b0c3b9);--line:light-dark(#d8e2d9,#41554a);--tint:light-dark(#e8efe6,#30443a);--accent:light-dark(#2c6653,#b4d9b6);--on-accent:light-dark(#fff,#17291e);--error:light-dark(#a32424,#ffb4b4);color:var(--ink);background:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;line-height:1.5}button,input,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.4;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button svg{flex-shrink:0}a{color:inherit;text-underline-offset:3px}[hidden]{display:none!important}.topbar{padding:20px 32px;display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--line)}.brand{font-size:1.35rem;font-weight:650;letter-spacing:-.7px;display:flex;align-items:center;gap:10px}.brand svg{width:22px;color:var(--accent)}.header-actions{display:flex;align-items:center;gap:20px}.level{font-size:.75rem;letter-spacing:1px;color:var(--soft)}.icon-button{border:0;background:transparent;color:var(--soft);display:grid;place-items:center;width:44px;height:44px;border-radius:9px}.icon-button:hover{background:var(--tint)}.practice-main{max-width:710px;margin:0 auto;padding:38px 28px 30px}.eyebrow{font-size:.75rem;letter-spacing:1.6px;font-weight:650;color:var(--soft);text-transform:uppercase;margin:0}h1{font-size:2rem;line-height:1.2;letter-spacing:-1px;font-weight:600;margin:9px 0 11px}.intro{color:var(--soft);margin:0}.mode-switch{display:flex;gap:6px;padding:5px;background:var(--tint);border-radius:12px;margin:26px 0 22px}.mode-switch button{flex:1;min-width:0;min-height:48px;padding:9px 8px;border:0;border-radius:9px;background:transparent;color:var(--soft);font-size:.9rem;font-weight:550}.mode-switch button[aria-pressed=true]{background:var(--paper);color:var(--ink);box-shadow:0 1px 3px #00000012}.mode-switch span{font-size:.75rem;margin-left:7px;font-weight:400}.practice-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:28px;margin-bottom:14px}.card-meta{display:flex;justify-content:space-between;gap:16px;align-items:baseline;color:var(--soft);font-size:.75rem}.card-meta>span:last-child{white-space:nowrap;font-variant-numeric:tabular-nums}.prompt-row{display:flex;align-items:center;gap:20px;margin:25px 0 20px}.prompt{font-size:1.8rem;line-height:1.4;letter-spacing:-.4px;font-weight:500;margin:0;flex:1;min-width:0;overflow-wrap:anywhere}.play-button{width:46px;height:46px;flex-shrink:0;border:0;border-radius:50%;display:grid;place-items:center;color:var(--accent);background:var(--tint)}.play-button:hover{filter:brightness(.93)}.play-button.playing{background:var(--accent);color:var(--on-accent)}.audio-controls{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;color:var(--soft);font-size:.875rem}.voice-label{display:flex;align-items:center;gap:7px}.audio-controls label{display:flex;align-items:center;gap:8px}select{border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);padding:8px;min-height:42px}.audio-status{font-size:.875rem;color:var(--soft)}.audio-status:not(:empty){margin-top:14px}.reveal-button{display:flex;justify-content:center;align-items:center;gap:10px;width:100%;min-height:54px;border:1px dashed var(--line);border-radius:12px;background:var(--paper);color:var(--ink);padding:14px 16px;font-weight:550}.reveal-button:hover{background:var(--tint)}.answer-hint{text-align:center;font-size:.875rem;color:var(--soft);margin:11px 0 24px}.answer-card{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:22px;margin-top:12px}.answer-caption{font-size:.875rem;color:var(--soft);margin:0 0 14px}.answer-card ol{margin:0;padding:0;list-style:none}.answer-card li{display:flex;gap:16px;align-items:baseline;border-top:1px solid var(--line);padding:15px 0;font-size:1.05rem}.answer-card li:last-child{padding-bottom:0}.answer-number{font-size:.75rem;color:var(--soft);flex-shrink:0;width:17px}.answer-card strong{font-weight:650;color:var(--accent)}.personal-note{font-size:.875rem;color:var(--soft);margin:18px 0 0}.practice-navigation{display:flex;justify-content:space-between;gap:12px;margin-top:24px}.button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid var(--line);border-radius:10px;background:var(--paper);color:var(--ink);padding:11px 17px}.button:hover:not(:disabled){filter:brightness(.96)}.primary{background:var(--accent);color:var(--on-accent);border-color:transparent}.end-note{color:var(--soft);text-align:center;font-size:.875rem}.jump-form{display:flex;align-items:center;justify-content:center;gap:9px;flex-wrap:wrap;margin-top:28px;font-size:.875rem;color:var(--soft)}.jump-form input{width:78px;padding:7px 8px;border:1px solid var(--line);border-radius:7px;background:var(--paper);color:var(--ink);min-height:42px}.jump-form button{display:flex;align-items:center;gap:5px;border:0;color:var(--ink);background:transparent;padding:10px;min-height:42px}.source-note{font-size:.75rem;color:var(--soft);text-align:center;margin-top:28px;line-height:1.8}.connection-state{padding:40px;text-align:center}.error{color:var(--error);font-size:.875rem}.global-error{text-align:center;padding:12px}.login-wrap{min-height:100dvh;display:grid;place-items:center;padding:24px}.login-card{width:100%;max-width:400px;padding:32px}.login-icon{color:var(--accent);margin-bottom:12px}.password-label{display:block;margin:28px 0 8px;font-size:.875rem}.login-card input{width:100%;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:9px;padding:12px}.login-submit{width:100%;margin-top:18px;justify-content:space-between}@media(max-width:480px){.topbar{padding:12px 16px}.header-actions{gap:8px}.brand{font-size:1.2rem}.brand svg{width:20px}.practice-main{padding:26px 16px}.practice-card{padding:21px}.prompt{font-size:1.5rem}.prompt-row{gap:12px}.mode-switch span{display:block;margin:2px 0 0}.mode-switch button{font-size:.875rem}h1{font-size:1.75rem}.answer-card{padding:19px}.intro{font-size:.95rem}.source-note{margin-top:24px}.answer-hint{font-size:.8rem}.login-card{padding:25px}}.prompt-translation{margin:-4px 0 20px;color:var(--soft);font-size:.875rem}.prompt-translation summary{display:flex;align-items:center;gap:8px;cursor:pointer;list-style:none;width:fit-content;max-width:100%;min-height:44px;padding:7px 0}.prompt-translation summary::-webkit-details-marker{display:none}.prompt-translation summary svg{flex-shrink:0}.prompt-translation summary:hover{color:var(--accent)}.prompt-translation summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px;border-radius:4px}.prompt-translation p{font-size:1rem;color:var(--ink);margin:4px 0 0;padding:12px 16px;border-left:2px solid var(--line);overflow-wrap:anywhere}.prompt-translation .translation-hide{display:none}.prompt-translation[open] .translation-hide{display:inline}.prompt-translation[open] .translation-show{display:none}.answer-content{flex:1;min-width:0}.answer-translation{margin:3px 0 0}.answer-translation p{margin-bottom:5px}.prompt-text{flex:1;min-width:0}.prompt-text summary{display:flex;align-items:center;gap:8px;width:fit-content;max-width:100%;min-height:46px;padding:10px 0;color:var(--soft);cursor:pointer;list-style:none}.prompt-text summary::-webkit-details-marker{display:none}.prompt-text summary svg{flex-shrink:0}.prompt-text summary:hover{color:var(--accent)}.prompt-text summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px;border-radius:4px}.prompt-text .prompt{margin-top:12px}.prompt-text .prompt-hide{display:none}.prompt-text[open] .prompt-hide{display:inline}.prompt-text[open] .prompt-show{display:none}@media(prefers-reduced-motion:no-preference){button{transition:background-color .15s,color .15s}}