:root{--bg:#f7f5ef;--paper:#fffefa;--ink:#27392f;--muted:#737b72;--line:#dedfd4;--accent:#b54c2e;--soft:#eee5d9;--card-font:30px;font-family:"Yu Gothic UI","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0}header{max-width:1100px;margin:auto;padding:25px 34px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}a{color:inherit}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:700;letter-spacing:.08em}.brand-mark{display:grid;place-items:center;background:var(--ink);color:var(--paper);font-family:serif;font-size:29px;border-radius:9px;width:44px;height:46px}.brand small{display:block;font-size:10px;font-weight:400;letter-spacing:.17em;margin-top:3px;color:var(--muted)}main{max-width:1020px;margin:auto;padding:42px 28px 120px}h1,h2,h3,p{margin-top:0}h1{font-size:32px;font-weight:600;letter-spacing:.045em;margin-bottom:12px}h2{font-size:28px;line-height:1.7;font-weight:600}h3{font-size:18px}p{line-height:1.9}.muted{color:var(--muted)}.small{font-size:12px;line-height:1.8}.eyebrow{font-size:11px;letter-spacing:.16em;font-weight:600;color:var(--accent);margin-bottom:15px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:28px}.seal{font-family:serif;color:var(--accent);border:1.5px solid var(--accent);border-radius:5px;letter-spacing:.18em;line-height:1.2;padding:8px 5px;transform:rotate(4deg);font-size:17px}.panel{background:var(--paper);border:1px solid var(--line);border-radius:18px}.hero{padding:36px 40px;display:grid;grid-template-columns:1fr 240px;gap:30px}.hero h2{margin:18px 0 14px;font-size:32px}.tag{font-size:12px;background:#e9eee4;color:#536748;border-radius:20px;padding:6px 12px}.example{display:flex;flex-direction:column;gap:12px;align-items:center;justify-content:center;border-left:1px solid var(--line);font-family:serif}.example strong{font-size:38px;letter-spacing:.15em;font-weight:400}.example-arrow{color:#b7b9ad}.ruby-line{font-size:var(--card-font);line-height:2.6;overflow-wrap:anywhere;font-family:"Yu Mincho","Songti SC","Noto Serif CJK SC",serif}.example .ruby-line{font-size:46px;color:var(--accent)}ruby{ruby-align:center;display:inline ruby;margin:0 .11em;white-space:nowrap}rt{font-family:Georgia,"Times New Roman",serif;font-size:.34em;font-weight:400;letter-spacing:0;line-height:1.2;color:var(--muted)}.example rt{color:var(--accent)}.hide-pinyin rt{visibility:hidden}.primary,.secondary,.quiet{border-radius:9px;font:inherit;font-size:14px;cursor:pointer;padding:13px 18px;min-height:46px;border:1px solid transparent;transition:background .12s}.primary{background:var(--accent);color:white;font-weight:600}.primary span{margin-left:28px}.primary:hover{background:#9c3e25}.secondary{border-color:var(--line);background:var(--paper);color:var(--ink)}.secondary:hover,.quiet:hover{background:var(--soft)}.quiet{background:transparent;color:var(--muted)}button:disabled{opacity:.5;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #bc8657;outline-offset:3px}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}.metric{padding:23px 24px;border:1px solid var(--line);border-radius:13px;background:var(--paper)}.metric>span{font-size:12px;color:var(--muted)}.metric strong{font-family:Georgia,serif;font-size:42px;display:block;font-weight:400;margin:9px 0}.metric small{font-size:11px;color:var(--muted)}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px}.compact{padding:26px;margin-bottom:18px}.compact h2{font-size:20px}.steps{padding-left:23px;color:var(--muted);font-size:14px;line-height:2.3}label{display:block;font-size:13px;margin:12px 0 8px}input:not([type=checkbox]):not([type=range]),textarea{width:100%;padding:13px;border-radius:8px;border:1px solid var(--line);background:var(--paper);font:inherit;font-size:16px;color:var(--ink)}input[type=checkbox]{accent-color:var(--accent);width:17px;height:17px;vertical-align:middle}input[type=range]{accent-color:var(--accent);max-width:90px;vertical-align:middle}textarea{resize:vertical}.inline{display:flex;gap:10px}.inline input{max-width:90px}.actions{display:flex;gap:10px;flex-wrap:wrap}.display-tools{display:flex;gap:20px;justify-content:space-between;align-items:center;margin:15px 0 20px}.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.word-card{padding:23px;min-width:0}.word-card .japanese{font-size:15px;color:var(--muted);margin-bottom:12px}.word-card .ruby-line{margin:5px 0 10px}.word-card .note{font-size:12px;color:var(--muted);min-height:40px}.word-card .actions{border-top:1px solid var(--line);padding-top:12px}.word-card .actions button{padding:7px 12px;min-height:38px;font-size:12px}.study-card{text-align:center;padding:35px 25px;max-width:720px;margin:auto}.study-card .question{font-family:"Yu Mincho",serif;font-size:clamp(26px,7vw,45px);line-height:1.9;overflow-wrap:anywhere;margin:35px 0}.study-card .ruby-line{font-size:clamp(30px,8vw,44px);margin:25px 0;line-height:2.8}.study-card .answer{border-top:1px solid var(--line);padding-top:20px;margin-top:20px}.study-card .actions{justify-content:center}.study-card .actions button{flex:1;min-width:130px}.study-card .good{color:#426647;background:#e9eee4}.study-card .again{color:var(--accent);background:#f6e8e0}.study-meta{max-width:720px;margin:0 auto 15px;display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.study-card h2{margin:20px 0}.empty{text-align:center;padding:40px 20px;color:var(--muted);border:1px dashed var(--line);border-radius:15px}.message{position:fixed;bottom:90px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);width:max-content;background:var(--ink);color:white;padding:14px 20px;border-radius:10px;box-shadow:0 3px 20px #0002;z-index:20;font-size:14px}.message.error{background:#9e3e2c}nav{position:fixed;bottom:0;width:100%;display:flex;justify-content:center;background:#fffefaed;backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:9px 12px max(9px,env(safe-area-inset-bottom));z-index:10}nav button{border:0;background:transparent;color:var(--muted);font:inherit;font-size:11px;display:flex;flex-direction:column;align-items:center;gap:3px;width:150px;cursor:pointer;padding:5px;border-radius:8px}nav button span{font-family:serif;font-size:20px}nav button.active{color:var(--accent);background:#f4ece3}dialog{width:min(560px,calc(100% - 24px));max-height:90dvh;overflow:auto;border:1px solid var(--line);border-radius:18px;background:var(--bg);color:var(--ink);padding:26px}dialog::backdrop{background:#14221a88}dialog .section-heading{margin-bottom:10px}dialog h2{font-size:23px;margin:0}dialog .primary{width:100%}dialog textarea{margin-bottom:8px}dialog #editor-message{color:var(--accent)}.login{max-width:450px;margin:50px auto}.login h1{font-size:38px;line-height:1.6}.login form{margin-top:30px}.login form button{width:100%;margin-top:15px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(max-width:640px){header{padding:18px 20px}main{padding:28px 18px 110px}h1{font-size:26px}.section-heading{gap:10px;align-items:flex-start;margin-bottom:22px}.section-heading>.primary{font-size:12px;padding:12px;min-width:100px}.section-heading .muted{font-size:13px}.hero{grid-template-columns:1fr 105px;padding:24px 20px;gap:12px}.hero h2{font-size:24px}.hero p{font-size:12px}.hero .primary{font-size:13px;padding:12px 10px}.hero .primary span{margin-left:6px}.example strong{font-size:28px}.example .ruby-line{font-size:34px}.metrics{gap:8px;margin:18px 0}.metric{padding:17px 12px}.metric>span{font-size:11px}.metric strong{font-size:34px}.metric small{font-size:10px}.two-col,.card-grid{grid-template-columns:1fr}.compact{padding:22px}.display-tools{gap:8px;flex-wrap:wrap}.display-tools label{font-size:12px}.study-card{padding:24px 16px}.study-card .actions{gap:8px}.study-card .actions button{min-width:0;font-size:12px;padding:13px 8px}.login{margin:25px auto}.login h1{font-size:32px}.seal{font-size:15px}.word-card .ruby-line{font-size:var(--card-font)}}
.ruby-line .changed{color:var(--accent)}