@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800&display=swap');

/* Cùng font chữ Hán KaiTi dùng cho Flashcard/Trắc nghiệm/Luyện nghe ở index.html,
   để trang Luyện đọc (mở trong iframe riêng, không nạp css/fonts.css) đồng bộ. */
@font-face {
  font-family:"HuiChineseKaiTi";
  src:url("../assets/fonts/kaiti.ttf") format("truetype");
  font-style:normal;
  font-weight:400;
  font-display:swap;
}

:root{--green:#176b3a;--green2:#0f542d;--bg:#fff;--card:#fff;--text:#1f2822;--muted:#68736b;--border:#dfe6e0;--soft:#edf6f0;--danger:#b52b31}
*{box-sizing:border-box}
html,body{margin:0;font-family:"Nunito",Arial,sans-serif;background:var(--bg);color:var(--text)}
button,input,textarea,select{font-family:"Nunito",Arial,sans-serif}
.chinese,.word,.zh,.words,textarea{font-family:"HuiChineseKaiTi","SimSun","宋体","NSimSun",serif}
.header{background:#fff;border-bottom:1px solid var(--border);padding:18px 20px;text-align:center}
.brand{font-size:28px;font-weight:800;color:var(--green)}
.sub{font-size:14px;color:var(--muted);margin-top:5px}
.wrap{max-width:1050px;margin:24px auto;padding:0 16px}
.grid{display:grid;grid-template-columns:1.3fr .7fr;gap:18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:15px;padding:20px;box-shadow:0 3px 12px rgba(0,0,0,.035)}
h2{font-size:20px;margin:0 0 14px;color:var(--green)}
.content-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.content-title h2{margin:0;transform:translateY(4px) !important;}
.level-suggest-group{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.level-suggest-label{font-size:13px;color:var(--muted);white-space:nowrap}
.level-suggest-btn{white-space:nowrap;padding:8px 14px}
@media(max-width:520px){
  .content-title{align-items:flex-start}
  .level-suggest-group{width:100%}
  .level-suggest-label{width:100%}
  .level-suggest-btn{font-size:13px;padding:8px 11px}
}

textarea{width:100%;min-height:155px;resize:none;border:1px solid var(--border);border-radius:11px;padding:14px;font-size:20px;line-height:1.8;outline:none;color:var(--text)}
textarea:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(23,107,58,.1)}
textarea::placeholder{font-family:"Nunito",Arial,sans-serif;font-size:15px;font-weight:700}
button,h1,h2,h3,.sub,.note,.meaning,.pinyin,.vocab-pinyin,.vocab-meaning,.footer,.count,.empty{font-family:"Nunito",Arial,sans-serif}
.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:10px}
button{border:0;border-radius:9px;padding:10px 15px;font-size:15px;cursor:pointer;font-weight:700}
.primary{background:var(--green);color:#fff}.primary:hover{background:var(--green2)}
.secondary{background:#edf0ed;color:#263029}
.reader{margin-top:15px;border:1px solid var(--border);border-radius:11px;padding:15px;background:#fff;height:250px;min-height:250px;max-height:250px;overflow:auto}
.reader > b{font-size:18px;font-weight:700;line-height:1.4}
.words{font-size:18px;line-height:2.25}
.word{background:var(--soft);border:0;border-bottom:2px solid transparent;border-radius:5px;padding:1px 5px;margin:2px 2px;color:var(--text);font-size:18px;font-weight:500}
.word:hover,.word.active{background:#dceee3;color:var(--green);border-bottom-color:var(--green)}
.punct{display:inline;font-size:18px}
.note{font-size:12px;color:var(--muted);margin-top:10px}
.lookup{margin-top:14px;border:1px solid #cfe2d5;background:var(--soft);border-radius:10px;padding:13px;display:none}
.lookup.show{display:block}
.zh{font-size:24px;font-weight:800;color:var(--green)}
.pinyin{font-size:15px;color:var(--green);margin-top:3px}
.meaning{font-size:15px;margin-top:7px;line-height:1.5}
.lookup-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.small{padding:8px 12px;font-size:15px}
.count{float:right;background:var(--soft);color:var(--green);border-radius:999px;padding:4px 9px;font-size:13px}
.vocab-list{display:flex;flex-direction:column;gap:8px;max-height:200px;overflow:auto}
.vocab{border:1px solid var(--border);border-radius:9px;padding:10px 11px;display:flex;align-items:center;justify-content:space-between;gap:8px}
.vocab-main{min-width:0}.vocab-word{font-size:18px;font-weight:400;font-family:"HuiChineseKaiTi","SimSun","宋体","NSimSun",serif}.vocab-pinyin{font-size:15px;color:var(--green)}.vocab-meaning{font-size:15px;color:#4c554f;margin-top:2px}
.icon-btn{padding:6px 9px;background:#edf0ed}.delete{color:var(--danger)}
.empty{color:var(--muted);text-align:center;padding:25px 8px;font-size:15px}
.footer{text-align:center;color:var(--muted);font-size:15px;padding:24px}
@media(max-width:760px){.grid{grid-template-columns:1fr}.wrap{margin:14px auto}.card{padding:15px}textarea{font-size:18px}.words,.word{font-size:18px}}