:root{
  --bg:#faf7f1;
  --paper:#ffffff;
  --ink:#2c2a26;
  --ink-2:#4a463f;
  --dim:#8d867a;
  --accent:#1f5f4f;
  --accent-2:#2b7b66;
  --gold:#b08d3f;
  --line:#e8e2d7;
  --danger:#b3341f;
  --radius:14px;
  --shadow:0 2px 10px rgba(60,48,30,.06);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --sans:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:15px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.wrap.narrow{max-width:720px}
.dim{color:var(--dim)}
.center{text-align:center}
.center-block{text-align:center;padding:60px 0}

/* ---------- header ---------- */
.site-header{background:rgba(250,247,241,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:var(--serif);font-size:18px}
.brand-text b{display:block;font-family:var(--serif);font-size:17px;letter-spacing:.06em}
.brand-text i{display:block;font-style:normal;font-size:11px;color:var(--dim);letter-spacing:.16em}
.nav{display:flex;align-items:center;gap:18px;font-size:14px}
.nav a{color:var(--ink-2)}
.nav a.on{color:var(--accent);font-weight:600}
.nav a.ghost{color:var(--dim)}
.btn-sm{background:var(--accent);color:#fff!important;padding:7px 14px;border-radius:999px;font-size:13px;text-decoration:none!important;border:none;cursor:pointer}
.btn-sm.ghost{background:transparent;color:var(--accent)!important;border:1px solid var(--accent)}

/* ---------- hero ---------- */
.hero{padding:64px 0 28px;text-align:center}
.hero h1{font-family:var(--serif);font-size:44px;margin:0;letter-spacing:.3em;text-indent:.3em}
.hero-sub{font-family:var(--serif);font-size:19px;color:var(--accent);margin:8px 0 0;letter-spacing:.2em}
.hero-desc{color:var(--dim);margin-top:14px}

/* ---------- shelf ---------- */
.shelf{padding:24px 0 10px}
.shelf-head{display:flex;align-items:baseline;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:22px}
.shelf-head h2{font-family:var(--serif);font-size:22px;margin:0;letter-spacing:.1em}
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.book-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);position:relative;transition:.2s}
.book-card:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(60,48,30,.10)}
.book-card.offline{opacity:.62}
.book-tag{display:inline-block;font-size:12px;color:var(--gold);border:1px solid #e7dcc0;background:#fdf9ef;padding:1px 8px;border-radius:4px}
.book-title{font-family:var(--serif);font-size:20px;margin:12px 0 4px;line-height:1.5;min-height:44px}
.book-sub{color:var(--dim);font-size:13px;margin:0 0 14px}
.badge-off{background:#eee;color:#888;font-size:11px;padding:1px 6px;border-radius:4px;margin-left:6px}
.book-meta{list-style:none;display:flex;gap:18px;padding:0;margin:0 0 16px;font-size:12px;color:var(--dim)}
.book-meta b{font-size:16px;color:var(--ink);font-family:var(--serif);margin-right:2px}
.book-actions{display:flex;align-items:center;gap:14px}
.btn{display:inline-block;background:var(--accent);color:#fff!important;padding:9px 20px;border-radius:999px;font-size:14px;text-decoration:none!important;border:none;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--accent-2)}
.btn.ghost{background:transparent;color:var(--accent)!important;border:1px solid var(--accent)}
.btn.disabled{background:#ddd;color:#888!important;cursor:not-allowed}
.btn.wide{width:100%;padding:12px}
.graduate-summary-card{border-color:#d9d3c5;background:linear-gradient(145deg,#fff 0%,#fbfaf6 100%)}
.graduate-summary-card .book-title{margin-bottom:7px}
.graduate-summary-card .book-meta{margin-bottom:14px}
.graduate-options{display:grid;gap:8px}
.contact-strip{padding:28px 0 12px}.contact-strip-inner{display:flex;justify-content:center;gap:18px;max-width:680px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;box-shadow:var(--shadow)}.contact-item{flex:1;text-align:center}.contact-strip img{width:132px;height:132px;object-fit:cover;border-radius:8px}.contact-strip h3{font-family:var(--serif);margin:8px 0 6px;font-size:19px}.contact-strip p{margin:4px 0;color:var(--dim);font-size:13px}.contact-strip .contact-id{color:var(--accent)}@media (max-width:600px){.contact-strip-inner{gap:8px;padding:14px 10px}.contact-strip img{width:112px;height:112px}.contact-strip h3{font-size:17px}.contact-strip p{font-size:12px}}
.graduate-option{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 13px;border:1px solid #d8e5da;border-radius:11px;background:#f5faf5;color:var(--accent);text-decoration:none;transition:.2s}
.graduate-option:hover{border-color:var(--accent);background:#eaf5ec;transform:translateX(2px)}
.graduate-option span{font-weight:600;font-size:14px}
.graduate-option em{font-style:normal;font-weight:400;font-size:12px;color:var(--dim);margin-left:5px}
.graduate-option small{color:var(--dim);font-size:11px;white-space:nowrap}
.graduate-option.disabled{color:#999;background:#f3f1ec;border-color:#e4e0d7;cursor:not-allowed}
.graduate-option.disabled:hover{transform:none;border-color:#e4e0d7;background:#f3f1ec}
.single-book-option{width:100%;box-sizing:border-box}
.btn-link{font-size:13px;color:var(--dim)}

/* ---------- feature ---------- */
.feature{margin:48px 0 60px}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:26px;border-top:1px solid var(--line);padding-top:34px}
.feature-grid h4{font-family:var(--serif);font-size:16px;margin:0 0 6px;color:var(--accent)}
.feature-grid p{margin:0;font-size:13.5px;color:var(--dim)}

/* ---------- pages ---------- */
.page{padding:36px 0 70px}
.page h1{font-family:var(--serif);font-size:30px;margin:14px 0 12px;letter-spacing:.06em}
.back{font-size:13px;color:var(--dim)}
.lead{color:var(--ink-2);margin-bottom:24px}
.steps{list-style:none;counter-reset:s;padding:0}
.steps li{counter-increment:s;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin-bottom:14px;position:relative;box-shadow:var(--shadow)}
.steps h4{margin:0 0 6px;font-family:var(--serif);font-size:16px;color:var(--accent)}
.steps p{margin:0;font-size:14px;color:var(--ink-2)}
.steps code{background:#f3efe6;padding:2px 6px;border-radius:4px;font-size:13px}
.notice{background:#f5f7f4;border:1px solid #dfe7e0;border-left:3px solid var(--accent);border-radius:8px;padding:16px 20px;margin:26px 0}
.notice.warn{background:#fdf6f3;border-color:#f0ddd5;border-left-color:var(--danger)}
.notice.small{font-size:13px;color:var(--dim)}
.notice h4{margin:0 0 8px;font-size:15px;font-family:var(--serif)}
.notice ul{margin:0;padding-left:20px;font-size:13.5px;color:var(--ink-2)}
.notice li{margin:4px 0}

/* ---------- form ---------- */
.form{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.form label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:14px}
.form input,.form select,.form textarea{
  width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:9px;
  font-size:14px;font-family:inherit;background:#fdfcfa;color:var(--ink)
}
.form input:focus,.form select:focus{outline:none;border-color:var(--accent);background:#fff}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.tip{font-size:12px;color:var(--dim);background:#f7f4ee;padding:9px 12px;border-radius:8px;margin-bottom:16px}
.alert{background:#fdf1ee;border:1px solid #f2d5cc;color:var(--danger);padding:11px 14px;border-radius:9px;margin-bottom:16px;font-size:14px}
.alert-inline{color:var(--danger);font-size:13px;margin:4px 0 0}
.msg{margin-top:14px;font-size:14px}
.msg.err{color:var(--danger)}
.msg.ok{color:var(--accent)}

/* ---------- shelf(own) ---------- */
.own-list{display:flex;flex-direction:column;gap:14px;margin:20px 0}
.own-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;display:flex;justify-content:space-between;align-items:center;gap:16px;box-shadow:var(--shadow)}
.own-card.revoked{background:#faf7f6;border-color:#eedcd6}
.own-card h3{font-family:var(--serif);font-size:18px;margin:0 0 4px}
.own-card p{margin:0;font-size:12.5px}

/* ---------- table ---------- */
.table{width:100%;border-collapse:collapse;background:var(--paper);border:1px solid var(--line);border-radius:10px;overflow:hidden;font-size:13.5px}
.table th{background:#f5f2eb;text-align:left;padding:10px 12px;font-weight:600;color:var(--ink-2);white-space:nowrap}
.table td{padding:9px 12px;border-top:1px solid var(--line);vertical-align:middle}
.table td.w{font-family:var(--serif);font-weight:600}
.mini{font-size:12px;padding:4px 10px;border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer;color:var(--ink-2);font-family:inherit;text-decoration:none;display:inline-block}
.mini:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

/* ---------- preview ---------- */
.preview-body{font-family:var(--serif);font-size:17px;line-height:2.1;position:relative}
.preview-body p{margin:0 0 1.1em;text-indent:2em}
.fade-mask{height:120px;margin-top:-120px;background:linear-gradient(180deg,rgba(250,247,241,0),var(--bg));position:relative;margin-bottom:20px}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:26px 0 40px;font-size:12.5px;color:var(--dim);text-align:center}
.site-footer p{margin:4px 0}

/* ================= 阅读器 ================= */
body.reader-body{background:#f6f3ec}
.noselect{
  -webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;
  -webkit-touch-callout:none;
}
.reader{display:flex;min-height:calc(100vh - 62px);position:relative}
.toc{width:262px;flex:none;border-right:1px solid var(--line);background:#fbf9f4;max-height:calc(100vh - 62px);overflow-y:auto;position:sticky;top:62px}
.toc{transition:width .2s,margin-left .2s,transform .2s}
.toc-head{padding:16px 18px;border-bottom:1px solid var(--line);font-family:var(--serif)}
.toc-head b{display:block;font-size:15px;line-height:1.5}
.toc-head span{font-size:12px}
.toc-list{list-style:none;margin:0;padding:8px 0}
.toc-list a{display:flex;gap:8px;padding:8px 18px;font-size:13px;color:var(--ink-2);line-height:1.5}
.toc-list a:hover{background:#f2eee4;text-decoration:none}
.toc-list a.on{background:#eaf1ed;color:var(--accent);font-weight:600}
.toc-list i{font-style:normal;color:var(--dim);font-size:12px;min-width:20px}
.reader-main{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center}
.reader-bar{width:100%;max-width:780px;display:flex;gap:8px;align-items:center;padding:14px 24px 0}
.reader-bar .spacer{flex:1}
.chapter{
  max-width:780px;width:100%;padding:26px 24px 40px;
  font-family:var(--serif);font-size:var(--fs,17.5px);line-height:2.05;color:#242220;
  position:relative;
}
.chapter h2{font-size:24px;text-align:center;margin:10px 0 6px;letter-spacing:.04em}
.chapter .ch-no{text-align:center;color:var(--dim);font-size:13px;font-family:var(--sans);margin-bottom:26px}
.chapter h3{font-size:16px;color:var(--accent);text-align:center;margin:34px 0 18px;font-weight:600;letter-spacing:.1em}
.chapter h3::before,.chapter h3::after{content:"—";color:var(--line);margin:0 10px}
.chapter p{margin:0 0 1.15em;text-indent:2em}
.chapter .sep{text-align:center;color:var(--dim);letter-spacing:.6em;margin:22px 0}
.chapter .loading{text-align:center;color:var(--dim);padding:60px 0}
.w{cursor:pointer;white-space:nowrap;display:inline}
.w:hover .vocab-pill{filter:brightness(.97)}
.w.known .vocab-pill{opacity:.55;border-color:#c2decd}
.w.unmastered .reader-quiz-pill-v2,.w.unmastered .study-vocab-pill{background:#f1e6f4;border-color:#d8b9df;color:#68426f}
.word-info{position:fixed;left:50%;bottom:18px;z-index:220;width:min(440px,calc(100vw - 28px));transform:translate(-50%,20px);opacity:0;pointer-events:none;padding:14px 42px 14px 16px;border:1px solid #c2decd;border-radius:14px;background:#fffdf8;box-shadow:0 10px 30px rgba(36,55,42,.2);transition:.18s;color:var(--ink);font-size:14px;line-height:1.6}.word-info.show{transform:translate(-50%,0);opacity:1;pointer-events:auto}.word-info-word{display:inline-block;font-family:var(--serif);font-size:19px;color:#1e4d2e;margin-right:8px}.word-info-pos{color:var(--dim);font-size:12px}.word-info p{margin:7px 0 0}.word-info-context{color:#1e4d2e;font-weight:600}.word-info-other{color:var(--ink-2)}.word-info-close{position:absolute;right:10px;top:8px;border:0;background:transparent;color:var(--dim);font-size:24px;line-height:1;cursor:pointer}body.night .word-info{background:#1b231d;border-color:#365242;color:#e4eee5}body.night .word-info-word,body.night .word-info-context{color:#b4d6be}
/* 目标词汇（英文 / 中文）统一淡绿色 pill，与填空保持一致颜色 */
.vocab-pill{display:inline-flex;align-items:center;justify-content:flex-start;text-align:left;padding:0 12px;height:2em;line-height:1;border-radius:999px;background:#e6f4ea;border:1px solid #c2decd;color:#1e4d2e;font-family:var(--sans);font-size:.9em;font-weight:600;vertical-align:middle;margin:0 1px;white-space:nowrap;box-shadow:inset 0 1px 2px rgba(0,0,0,.04)}
/* 各模式隐藏对应方向：hide-cn 藏中文 pill，hide-en 藏英文 pill */
body.hide-mean .w .vocab-pill.cn{display:none}
body.hide-en .w .vocab-pill.en{display:none}
/* 学习版中英文合并在一个 pill 里 */
.vocab-pill .mid{opacity:.6;font-weight:400;margin:0 2px}
.study-vocab-pill{height:1.7em;padding:0 7px;border-radius:7px;font-size:.82em;font-weight:600;vertical-align:baseline}.study-vocab-pill .short-mean{font-weight:500;margin-left:1px}
.context-mean{color:inherit;font:inherit;white-space:normal}
body.night .vocab-pill{background:#1e3326;color:#b4d6be;border-color:#365242}
body.night .w.known .vocab-pill{border-color:#3d5c46}

/* ---------- 学习模式工具条 ---------- */
.study-bar{width:100%;max-width:780px;display:flex;flex-direction:column;align-items:stretch;gap:8px;padding:10px 24px 0}
.study-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.study-prompt{font-size:13px;color:var(--dim);flex:1;min-width:140px}
.mode-tabs{display:flex;gap:6px;background:#f1ece2;border-radius:999px;padding:4px}
.mode-tabs .mini{border-radius:999px;border:none;background:transparent;font-size:13px}
.mode-tabs .mini.on{background:var(--accent);color:#fff}
.study-tools{display:flex;align-items:center;gap:10px}
.study-stat{font-size:12px;color:var(--dim);background:#f1ece2;padding:4px 10px;border-radius:999px;white-space:nowrap}
#btnAccent.on{color:var(--accent);border-color:var(--accent)}

/* ---------- 填空 ---------- */
.quiz-blank{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:42px;height:1.8em;line-height:1.6em;border-radius:999px;
  padding:0 20px 0 8px;text-align:center;color:#666;
  font-family:var(--sans);font-size:.9em;font-weight:600;
  vertical-align:middle;margin:0 1px;
  box-shadow:inset 0 1px 2px rgba(0,0,0,.04);
  border:1px solid #c2decd;cursor:crosshair;
  transition:background .15s,border-color .15s,color .15s,transform .15s;
  touch-action:none;-webkit-user-select:none;user-select:none;
  -webkit-tap-highlight-color:transparent;
  background:#f0f7f2;position:relative;overflow:visible
}
/* 填写正确：绿色（颜色即答案，不再显示徽标） */
.quiz-blank.right{background:#e6f4ea;border-color:#b7dcb7;color:#1e4d2e}
/* 填写错误：红色 */
.quiz-blank.wrong{background:#fde8e8;border-color:#e57373;color:#c62828}
.quiz-blank.wrong .ink-text{color:#c62828;font-weight:600}
body.night .quiz-blank{background:#1e3326;color:#b4d6be;border-color:#365242}
body.night .quiz-blank.right{border-color:#4a9d6e}
body.night .quiz-blank.wrong{background:#4a1c1c;border-color:#a85353;color:#ffcdd2}
body.night .quiz-blank.wrong .ink-text{color:#ffcdd2}
.quiz-blank .ink-text{display:inline-block;max-width:100%;padding:0}
/* 空括号占位符 */
.quiz-blank .q-placeholder{display:inline-block;width:2.4em;font-style:normal;color:#9db8a4;letter-spacing:2px}

/* 填空模式独立的绿色一体胶囊：固定顺序且不分配剩余空间。 */
.reader-body .reader-quiz-pill-v2{display:inline-flex;align-items:center;justify-content:flex-start;width:auto;min-width:0;height:1.8em;margin:0 2px;vertical-align:middle;white-space:nowrap;overflow:visible;background:#e6f4ea;border:1px solid #c2decd;border-radius:999px;color:#1e4d2e;box-sizing:border-box;font-family:inherit;font-size:inherit;line-height:inherit}
.reader-body .reader-quiz-pill-v2 .reader-quiz-hint{display:inline-flex;align-items:center;justify-content:flex-start;flex:0 0 auto;height:100%;padding:0 4px 0 10px;margin:0;color:inherit;font-family:inherit;font-size:inherit;font-weight:700;line-height:inherit;text-align:left;text-indent:0}
.reader-body .reader-quiz-pill-v2 .quiz-blank{display:inline-flex;align-items:center;justify-content:flex-start;flex:0 0 auto;width:auto;min-width:0;height:100%;margin:0;padding:0;border:0;background:transparent;box-shadow:none;color:inherit;font-family:inherit;font-size:inherit;line-height:inherit;text-indent:0}
.reader-body .reader-quiz-pill-v2 .quiz-blank .ink-text{display:inline-flex;align-items:center;justify-content:flex-start;min-width:0;padding:0;color:inherit;font-family:inherit;font-size:inherit;line-height:inherit;text-align:left;text-indent:0}
.reader-body .reader-quiz-pill-v2 .quiz-blank .q-placeholder{width:8.5em;font-style:normal;color:inherit;letter-spacing:0;opacity:.55}
.reader-body .reader-quiz-pill-v2 .quiz-blank.editing{display:inline-flex;width:8.5em;min-width:8.5em;justify-content:space-between;outline:none;white-space:nowrap}
.reader-body .reader-quiz-pill-v2 .quiz-blank.editing::before{content:'（';flex:0 0 auto}
.reader-body .reader-quiz-pill-v2 .quiz-blank.editing::after{content:'）';flex:0 0 auto}
.reader-body .reader-quiz-pill-v2 .quiz-blank.editing .ink-text{display:inline-block;flex:1 1 auto;width:auto;min-width:0;outline:none;white-space:pre;caret-color:var(--accent);color:var(--ink)}
.reader-body .reader-quiz-pill-v2 .reader-quiz-eye{display:inline-flex!important;align-items:center;justify-content:center;flex:0 0 26px;width:26px;height:100%;margin:0;padding:0;border:0;background:transparent;color:inherit;font-family:var(--sans);font-size:16px;font-style:normal;line-height:1;opacity:.8;cursor:pointer;user-select:none;position:relative;z-index:3;visibility:visible}
.reader-body .reader-quiz-pill-v2 .reader-quiz-eye:hover,.reader-body .reader-quiz-pill-v2 .reader-quiz-eye.open{opacity:1}
.reader-body .reader-quiz-pill-v2:has(.quiz-blank.wrong){background:#fde8e8;border-color:#e57373;color:#c62828}
.reader-body .reader-quiz-pill-v2 .quiz-blank.wrong,.reader-body .reader-quiz-pill-v2 .quiz-blank.wrong .ink-text{color:#c62828}
body.night.reader-body .reader-quiz-pill-v2{background:#1e3326;border-color:#365242;color:#b4d6be}
.quiz-blank:hover{filter:brightness(.97)}
.quiz-blank.flash{animation:blankFlash .45s ease-out}
@keyframes blankFlash{0%{transform:scale(1)}35%{transform:scale(1.12)}100%{transform:scale(1)}}
/* 朗读不支持时（vivo/部分浏览器/无声的安卓）的文字兜底浮层 */
.speech-fallback{position:fixed;left:50%;bottom:120px;transform:translateX(-50%);background:rgba(31,95,79,.95);color:#fff;font-size:15px;padding:10px 16px;border-radius:14px;z-index:200;max-width:84vw;display:flex;align-items:center;gap:10px;box-shadow:0 6px 18px rgba(0,0,0,.2);transition:opacity .35s ease;font-family:var(--sans);opacity:1}
.speech-fallback.hide{opacity:0;pointer-events:none}
.speech-fallback .sf-text{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.speech-fallback .sf-retry{flex:none;border:none;background:rgba(255,255,255,.18);color:#fff;border-radius:999px;padding:4px 10px;font-size:13px;cursor:pointer;font-family:inherit}
.speech-fallback .sf-retry:active{background:rgba(255,255,255,.32)}
body.night .speech-fallback{background:rgba(127,192,170,.95);color:#232120}
body.night .speech-fallback .sf-retry{background:rgba(0,0,0,.08);color:#232120}

.quiz-blank.editing{outline:2px solid var(--accent);outline-offset:2px;background:#fff}
.quiz-blank.editing .ink-text{display:inline-block;min-width:8.5em;outline:none;white-space:pre;caret-color:var(--accent);color:var(--ink)}
body.night .quiz-blank.editing{background:#1e3326}
.quiz-blank .ink-text{position:relative;z-index:1;color:inherit}
.quiz-blank:focus{outline:none;box-shadow:0 0 0 2px rgba(49,115,75,.25)}
/* 原位手写：画布覆盖填空周围区域 */
.quiz-blank .ink-canvas{position:absolute;left:-90px;top:-60px;width:calc(100% + 180px);height:calc(100% + 120px);z-index:2;border-radius:14px;touch-action:none;cursor:crosshair;background:transparent}
.quiz-blank.writing{z-index:10;outline:2px solid rgba(49,115,75,.30);outline-offset:3px}
.quiz-blank.writing .ink-canvas{background:transparent}
body.night .quiz-blank.writing{outline-color:rgba(127,192,170,.45)}

.ink-tools-float{position:absolute;z-index:130;display:flex;align-items:center;gap:6px;background:rgba(255,253,248,.98);border:1px solid #d6cfc0;border-radius:10px;padding:5px 8px;box-shadow:0 5px 18px rgba(0,0,0,.15);white-space:nowrap}
.ink-tools-float[hidden]{display:none!important}
.ink-hint{flex:1;font-size:11.5px;color:var(--dim);font-family:var(--sans);max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-right:4px}
.ink-kb-mini{position:absolute;z-index:140;width:22px;height:22px;border-radius:50%;background:var(--accent,#1f5f4f);color:#fff;border:none;font-size:11px;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 2px 6px rgba(0,0,0,.22);padding:0}
.ink-kb-mini[hidden]{display:none!important}
.ink-btn{border:1px solid var(--line);background:#fff;color:var(--ink-2);border-radius:7px;padding:4px 9px;font-size:12px;cursor:pointer;font-family:var(--sans);white-space:nowrap}
.ink-btn:hover{background:#f4efe4}
.ink-btn.primary{background:var(--accent,#1f5f4f);color:#fff;border-color:transparent}
.ink-input{display:block;width:100%;margin:6px 0 0;padding:6px 9px;border:1px solid var(--line);border-radius:7px;font-size:14px;font-family:var(--sans)}
.ink-input[hidden]{display:none!important}

.chapter-nav{display:flex;align-items:center;justify-content:center;gap:20px;padding:20px 0 60px}
.wm-layer{position:fixed;inset:0;pointer-events:none;z-index:60;overflow:hidden;opacity:.07;font-size:13px;color:#000;font-family:var(--sans)}

/* 浮动按钮 */
.reader-float{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:12px;z-index:90}
.fab{background:#2c2a26;color:#fff;border:none;border-radius:999px;padding:10px 18px;font-size:13px;font-weight:600;box-shadow:0 4px 14px rgba(0,0,0,.18);cursor:pointer;display:flex;align-items:center;gap:6px}
.fab:hover{background:#1f5f4f}
.fab span{background:rgba(255,255,255,.2);border-radius:999px;padding:1px 6px;font-size:11px}

/* 词卡弹窗 */
.card-overlay{position:fixed;inset:0;z-index:100;display:flex;flex-direction:column;justify-content:flex-end;pointer-events:none}
.card-overlay[hidden]{display:none!important}
.card-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.35);pointer-events:auto}
.card-sheet{position:relative;background:#fff;border-radius:18px 18px 0 0;padding:14px 18px 22px;box-shadow:0 -6px 30px rgba(0,0,0,.18);pointer-events:auto;animation:hwSlideUp .22s ease-out;max-height:78vh;overflow:hidden;display:flex;flex-direction:column}
.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;flex-shrink:0}
.card-title{font-size:14px;color:var(--dim)}
.card-title b{color:var(--ink);margin-left:6px}
/* 全部单词的滚动列表 */
.card-list{flex:1 1 auto;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:0 4px 8px;scrollbar-width:thin}
.card-list::-webkit-scrollbar{width:6px}
.card-list::-webkit-scrollbar-thumb{background:rgba(0,0,0,.18);border-radius:3px}
.card-item{border-bottom:1px solid #ece7da;padding:12px 6px;display:flex;align-items:center;gap:10px;transition:background .12s}
.card-item:hover{background:#faf6ec}
.card-item.known .card-item-word{opacity:.55;text-decoration:line-through}
.card-item.known .card-item-mean{opacity:.55}
.card-item.unmastered{background:#fbf3fc}
.card-item.unmastered .card-item-word,.card-item.unmastered .card-item-mean{color:#68426f}
.card-item-main{flex:1 1 auto;min-width:0}
.card-item-word{font-family:var(--serif);font-size:22px;color:var(--accent);font-weight:600;line-height:1.2}
.card-item-phon{font-size:12px;color:var(--dim);font-family:var(--sans);margin-top:2px}
.card-item-mean{font-size:15px;color:var(--ink-2);margin-top:4px;line-height:1.5}
.card-item-authority{font-size:13px;color:var(--dim);margin-top:3px;line-height:1.55}
.card-item-tools{flex:0 0 auto;display:flex;flex-direction:column;gap:6px;align-items:flex-end}
.card-item-tools .mini{min-width:44px;text-align:center;padding:5px 8px;font-size:12px}
.card-item-tools .card-tts{background:#f1ece2;color:var(--ink-2)}
.card-item-tools .card-tts:active{background:var(--accent);color:#fff}
.card-item-tools .card-known-btn{background:#fff;color:var(--ink-2);border-color:var(--line)}
.card-item-tools .card-known-btn.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.card-item-tools .card-unmastered-btn{background:#fff;color:#68426f;border-color:#d8b9df}
.card-item-tools .card-unmastered-btn.on{background:#ead7ee;color:#68426f;border-color:#c89ad1}
/* 旧式单卡 view 兼容（如果其他地方还有引用） */
.card-body{text-align:center;padding:4px 0 2px}
.card-word{font-family:var(--serif);font-size:30px;color:var(--accent);margin-bottom:4px}
.card-phon{font-size:15px;color:var(--dim);margin-bottom:10px;font-family:var(--sans)}
.card-mean{font-size:16px;color:var(--ink-2);margin-bottom:14px;line-height:1.6}
.card-actions{display:flex;justify-content:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}
.card-mastery{display:flex;justify-content:center;gap:10px}
#cardKnown.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.wm-layer span{position:absolute;white-space:nowrap;transform:rotate(-24deg)}

/* 夜间 */
body.night{background:#181715;color:#cfc9bf}
body.night .toc{background:#1e1c19;border-color:#2c2925}
body.night .toc-list a{color:#b4ada2}
body.night .toc-list a:hover{background:#272420}
body.night .toc-list a.on{background:#233029;color:#7fc0aa}
body.night .site-header{background:rgba(24,23,21,.92);border-color:#2c2925}
body.night .brand,body.night .nav a{color:#cfc9bf}
body.night .chapter{color:#c9c3b8}
body.night .mini{background:#232120;border-color:#332f2a;color:#b4ada2}
body.night .fab{background:#cfc9bf;color:#232120}
body.night .fab:hover{background:#7fc0aa;color:#181715}
body.night .card-sheet{background:#232120;color:#cfc9bf}
body.night .card-title{color:#b4ada2}
body.night .card-title b{color:#cfc9bf}
body.night .card-word{color:#7fc0aa}
body.night .card-mean{color:#cfc9bf}
body.night .card-item{border-color:#36322d}
body.night .card-item:hover{background:#272420}
body.night .card-item-word{color:#7fc0aa}
body.night .card-item-phon{color:#b4ada2}
body.night .card-item-mean{color:#cfc9bf}
body.night .card-item-authority{color:#b4ada2}
body.night .card-item-tools .card-tts{background:#272420;color:#cfc9bf;border-color:#4a443c}
body.night .card-item-tools .card-known-btn{background:#272420;color:#cfc9bf;border-color:#4a443c}
body.night .wm-layer{color:#fff;opacity:.05}
body.night .site-footer{border-color:#2c2925}
body.night .study-bar .mode-tabs,body.night .study-stat{background:#272420}
body.night .mode-tabs .mini{color:#b4ada2}
body.night .mode-tabs .mini.on{color:#fff}
body.night .quiz-blank{background:#1e3326;color:#b4d6be;border-color:#365242}
body.night .quiz-blank.right{border-color:#4a9d6e}
body.night .quiz-blank.wrong{border-color:#8a6d2b}
body.night .quiz-blank.writing{background:#253d30;border-color:#4a6654}
body.night .quiz-blank .ink-canvas{background:transparent}
body.night .quiz-blank .ink-text{color:#b4d6be}
body.night .ink-tools-float{background:rgba(35,33,32,.98);border-color:#4a443c}
body.night .ink-hint{color:#b4ada2}
body.night .ink-kb-mini{background:#4a9d6e}
body.night .ink-btn{background:#2a2825;color:#cfc9bf;border-color:#4a443c}
body.night .ink-btn:hover{background:#36322d}

/* 打印屏蔽 */
@media print{
  html,body{display:none!important}
}

@media (max-width:860px){
  .toc{position:fixed;left:0;top:62px;bottom:0;z-index:70;transform:translateX(-100%);transition:.2s;box-shadow:4px 0 20px rgba(0,0,0,.12)}
  .toc.open{transform:none}
  .row2{grid-template-columns:1fr}
  .hero h1{font-size:34px}
  .own-card{flex-direction:column;align-items:flex-start}
  .study-bar{flex-direction:column;align-items:flex-start;padding:10px 16px 0}
  .study-row{width:100%;gap:8px}
  .study-prompt{width:100%}
  .study-tools{width:100%;justify-content:space-between}
  .mode-tabs{width:100%;justify-content:center}
}

@media (min-width:861px){
  .toc.collapsed{width:0;border-right:0;overflow:hidden}
}
.word-info-phon{color:var(--dim);font-family:var(--serif);font-size:13px;margin-left:8px}

/* 学习中心 */
.learning-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}
.eyebrow{font:600 11px var(--sans);letter-spacing:.16em;color:var(--accent);margin:0 0 6px}
.learning-head h1{margin:0 0 8px}
.learning-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0 24px}
.learning-stats>div,.learning-panel{background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:14px;box-shadow:0 5px 18px rgba(56,72,53,.05)}
.learning-stats>div,.learning-stats>a{padding:17px 18px}.learning-stats>a{display:block;color:inherit;text-decoration:none}.learning-stats>a:hover{border-color:var(--accent);transform:translateY(-1px)}.learning-stats b{display:block;font:700 28px var(--serif);color:var(--accent)}.learning-stats span{font-size:13px;color:var(--dim)}
.learning-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:16px;margin-bottom:16px}.learning-panel{padding:20px}.panel-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.panel-title h2{font-size:19px;margin:0}.panel-title a{font-size:13px;color:var(--accent)}
.learning-book{padding:13px 0;border-top:1px solid var(--line)}.learning-book:first-of-type{border-top:0;padding-top:0}.learning-book-head{display:flex;justify-content:space-between;gap:12px;font-size:15px}.learning-book-head span{color:var(--accent);font-weight:700}.progress-track{height:8px;background:#e9e7dc;border-radius:99px;overflow:hidden;margin:10px 0 7px}.progress-track i{display:block;height:100%;background:linear-gradient(90deg,#a7c99a,var(--accent));border-radius:inherit}.learning-book p{display:inline-block;margin:0 12px 0 0;font-size:12px}.btn-sm{display:inline-block;padding:6px 10px;border:1px solid var(--line);border-radius:8px;color:var(--accent);font-size:12px}
.achievement-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.achievement{display:flex;align-items:center;gap:9px;padding:11px 8px;border:1px dashed var(--line);border-radius:10px;color:#aaa}.achievement.earned{border-style:solid;background:#f0f7ed;color:var(--accent)}.achievement-icon{width:27px;height:27px;border-radius:50%;display:grid;place-items:center;background:#eee;color:#aaa;font-weight:700}.earned .achievement-icon{background:var(--accent);color:#fff}.achievement b,.achievement small{display:block}.achievement b{font-size:13px}.achievement small{font-size:11px;margin-top:3px;color:var(--dim)}
.calendar-week,.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:7px}.calendar-week{color:var(--dim);font-size:11px;text-align:center;margin-bottom:7px}.calendar-cell{height:22px;border-radius:6px;background:#eeeae1}.calendar-cell.active{background:#7ea96e;box-shadow:inset 0 0 0 1px rgba(31,95,79,.2)}.calendar-legend{font-size:12px;color:var(--dim);margin:14px 0 0}.calendar-legend i,.calendar-legend span{display:inline-block;width:10px;height:10px;border-radius:3px;background:#7ea96e;vertical-align:-1px}.calendar-legend span{background:#eeeae1}
body.night .learning-stats>div,body.night .learning-panel{background:#232120;border-color:#3b3731}.night .progress-track,.night .calendar-cell{background:#35312c}.night .achievement.earned{background:#24372a}
.unmastered-panel{margin-bottom:16px}.unmastered-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.unmastered-row{display:grid;grid-template-columns:auto 1fr;column-gap:9px;padding:10px 12px;border:1px solid #d8b9df;border-radius:10px;background:#fbf3fc;color:#68426f;text-decoration:none}.unmastered-row:hover{background:#f3e5f6}.unmastered-row b{font-family:var(--serif)}.unmastered-row span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.unmastered-row small{grid-column:1/-1;margin-top:4px;color:#896b8e;font-size:11px}.vocab-word-link{color:var(--accent);font-weight:700;text-decoration:none}.vocab-word-link:hover{text-decoration:underline}.vocab-filter-links{font-size:13px}.vocab-filter-links a{color:var(--accent)}
@media (max-width:600px){.unmastered-list{grid-template-columns:1fr}}
@media (max-width:860px){.learning-head{align-items:flex-start;flex-direction:column}.learning-stats{grid-template-columns:repeat(2,1fr)}.learning-grid{grid-template-columns:1fr}.learning-panel{padding:16px}}