:root{color-scheme:light;--paper:#f8f7f2;--ink:#253a32;--muted:#7c827c;--green:#275c45;--line:#e1e4da;--white:#fffffc}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.45;cursor:default}[hidden]{display:none!important}.topbar{max-width:1200px;padding:23px 32px;margin:auto;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}.brand{font-size:17px;font-weight:650;display:flex;gap:10px;align-items:center;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:28px;height:28px;background:var(--green);color:white;border-radius:50%;font-size:23px}nav{display:flex;gap:26px;font-size:13px;color:var(--muted)}nav a.selected{color:var(--green);font-weight:650}main{max-width:1100px;margin:auto;padding:40px 32px 160px}.intro{padding:20px 0 36px}.intro.compact{padding:16px 0 24px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:650;color:var(--green)}h1{font-family:Georgia,"Microsoft YaHei",serif;font-weight:400;font-size:clamp(30px,4vw,43px);letter-spacing:-1px;margin:17px 0 15px;line-height:1.3}h2{font-size:19px;font-weight:600;margin:0 0 13px}p{line-height:1.8;margin:9px 0}.subtitle{font-size:15px;color:#76806e;margin:0}.muted{color:var(--muted)}.small,small{font-size:12px}.error{color:#9d4335}.back{font-size:12px;color:var(--muted)}.course-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}.course-card{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:29px;transition:border-color .15s}.course-card:hover{border-color:#a0b39a}.course-card h2{margin:22px 0 8px;font-size:25px}.course-card p{font-size:13px;color:var(--muted);min-height:45px}.card-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:19px;margin-top:25px;font-size:12px}.card-bottom span{color:var(--green)}.article-card{display:flex;align-items:center;gap:22px;padding:25px 10px;border-bottom:1px solid var(--line)}.article-card:hover{background:#eeeee6}.article-card h2{font-family:Georgia,serif;font-size:24px;margin:0}.article-card p{font-size:13px;color:var(--muted);margin-bottom:0}.duration{margin-left:auto;white-space:nowrap;color:var(--muted);font-size:12px}.number{font-size:11px;color:#9ca48e;font-variant-numeric:tabular-nums;line-height:28px}.empty{padding:45px 20px;text-align:center;line-height:1.8;color:var(--muted)}.lesson-meta{display:flex;gap:0;margin:22px 0 8px;color:#85897f;font-size:12px}.lesson-meta span+span:before{content:"/";padding:0 13px;color:#bbc0b3}.reading-heading{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 0 16px;margin-bottom:16px;font-size:12px}.reading-heading span:last-child{color:var(--muted);font-size:11px}.sentence-wrap{position:relative;max-width:850px;margin:auto}.sentence{width:100%;display:grid;grid-template-columns:28px 1fr 42px;gap:14px;align-items:start;border:1px solid transparent;background:transparent;text-align:left;padding:21px 60px 21px 18px;margin:4px 0;color:inherit;border-radius:10px;scroll-margin:34px}.sentence:hover{background:#efeee7}.sentence.active{background:#e8eee4;border-color:#d5dfce;box-shadow:inset 3px 0 var(--green)}.en{display:block;font-family:Georgia,"Times New Roman",serif;font-size:22px;line-height:1.65}.zh{display:block;font-size:13px;color:#7f8776;line-height:1.9;margin-top:6px}.stamp{font-size:10px;color:#9ca392;line-height:28px;text-align:right}.word{border-radius:4px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.active .word-read,.active .word-active{color:white;background:var(--green);box-shadow:0 0 0 3px var(--green)}.favorite-button{position:absolute;right:12px;top:20px;border:0;background:transparent;font-size:23px;color:#a0a68e;width:36px;height:36px}.favorite-button.saved{color:#a48232}.end-mark{text-align:center;font-size:9px;color:#a3a997;letter-spacing:2px;margin-top:36px}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid #d9dfd1;border-radius:7px;background:var(--white);padding:10px 15px;font-size:12px;line-height:1.3;cursor:pointer}.button:hover{border-color:#91a486}.button.primary{background:var(--green);color:white;border-color:var(--green)}.small-button{padding:8px 12px}.text-button,.text-link{border:0;background:transparent;padding:8px 0;color:var(--green);font-size:12px}.toolbar{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin:14px 0}.toolbar h2{margin:0;margin-right:auto}.favorite-card{border:1px solid var(--line);background:var(--white);padding:24px;border-radius:10px;margin:16px 0}.favorite-card.playing{border-color:#91a486;background:#edf1e9}.source{font-size:11px;color:var(--muted);margin:0 0 12px}.favorite-card .toolbar{margin-bottom:0}.tabs{display:flex;gap:23px;border-bottom:1px solid var(--line);margin-bottom:25px}.tab{border:0;border-bottom:2px solid transparent;background:transparent;padding:12px 1px;color:var(--muted);font-size:13px}.tab.active{color:var(--green);border-bottom-color:var(--green)}.small-tabs{gap:18px;margin-bottom:20px}.admin-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:24px}.admin-list,.editor{min-width:0}.admin-article{padding:20px;border:1px solid var(--line);border-radius:10px;margin:13px 0;background:var(--white)}.admin-article.current{border-color:#91a486}.article-name{display:block;border:0;background:transparent;padding:0;text-align:left;font-family:Georgia,"Microsoft YaHei",serif;font-size:19px;line-height:1.5;color:var(--ink);margin-bottom:7px}.admin-article .toolbar{gap:9px;margin:9px 0 0}.badge{display:inline-block;border-radius:4px;font-size:10px;padding:4px 7px;background:#e9ece3;color:#5d6f53;white-space:nowrap}.badge.failed{background:#f6e8e3;color:#9d4335}.badge.published{background:#e4eee3;color:var(--green)}.editor,.panel{background:var(--white);border:1px solid var(--line);border-radius:10px;padding:25px;margin-bottom:20px}.editor-empty{padding:35px 5px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.field{display:flex;flex-direction:column;gap:8px;margin:13px 0;font-size:12px}.field>span{font-weight:600}.field small{color:var(--muted);line-height:1.65;font-size:11px}input:not([type=range]):not([type=checkbox]),select,textarea{border:1px solid #d9dfd1;border-radius:6px;padding:10px 11px;background:#fff;color:var(--ink);width:100%;min-width:0;font-size:13px}textarea{line-height:1.7;resize:vertical}select{width:auto;max-width:100%}.field select{width:100%}.checkbox{display:flex;align-items:flex-start;gap:9px;font-size:12px;line-height:1.7;margin:17px 0}.checkbox input{margin-top:4px}.pair-preview{max-height:300px;overflow:auto;margin:12px 0}.pair-row{display:flex;gap:13px;border-bottom:1px solid var(--line);padding:10px 0;font-size:12px;line-height:1.8}.review-row{border-top:1px solid var(--line);padding:12px 0 20px}.review-en{font-family:Georgia,serif;font-size:18px}.review-row details{font-size:11px;color:var(--muted)}details{margin:15px 0;font-size:12px}summary{cursor:pointer;color:var(--green)}details textarea{margin-top:12px;font-family:Consolas,monospace;font-size:11px}.course-admin{max-width:850px}.migration-dialog{max-width:650px;width:90%;border:1px solid var(--line);border-radius:12px;padding:28px;max-height:85vh;overflow:auto}.migration-dialog::backdrop{background:#1a2e2260}.toast{position:fixed;top:85px;left:50%;transform:translateX(-50%);max-width:90%;background:#253a32;color:white;padding:13px 20px;border-radius:8px;font-size:12px;z-index:20;box-shadow:0 5px 20px #0002}.player{position:fixed;bottom:0;left:0;right:0;background:#fffffcf5;border-top:1px solid var(--line);padding:18px 24px calc(18px + env(safe-area-inset-bottom));backdrop-filter:blur(16px);z-index:5}.player-inner{max-width:900px;margin:auto;display:flex;align-items:center;gap:14px}.play-button{display:grid;place-items:center;width:46px;height:46px;flex-shrink:0;border:0;border-radius:50%;background:var(--green);color:white;font-size:20px}.icon-button{background:transparent;border:0;color:var(--green);padding:10px 2px;font-size:14px}.player-content{flex:1;min-width:0;margin-left:6px}.player-info{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:12px;margin-bottom:10px}#player-title{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}#status{color:#83907e;font-size:11px;white-space:nowrap}.seek-row{display:flex;gap:10px;align-items:center;font-size:10px;color:#8a9383;font-variant-numeric:tabular-nums}input[type=range]{width:100%;height:4px;accent-color:var(--green);cursor:pointer;margin:6px 0}.play-error{max-width:900px;margin:0 auto 12px;font-size:12px;color:#9d4335}.play-error button{margin-left:12px;border:0;background:transparent;color:var(--green)}@media(max-width:800px){.admin-layout{grid-template-columns:1fr}.admin-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.admin-list>.toolbar{grid-column:1/-1}.admin-article{margin:0}.editor{padding:20px}}@media(max-width:600px){.topbar{padding:18px 18px;gap:12px}.brand{font-size:15px;gap:7px}.brand-mark{width:25px;height:25px}nav{gap:15px;font-size:12px}main{padding:28px 16px 155px}.intro{padding-top:12px;padding-bottom:28px}h1{font-size:30px}.subtitle{font-size:13px}.course-grid{grid-template-columns:1fr;gap:15px}.course-card{padding:24px}.course-card h2{font-size:24px;margin-top:17px}.course-card p{min-height:0}.article-card{gap:13px;padding:22px 3px}.article-card h2{font-size:21px}.article-card p{font-size:12px}.duration{font-size:10px}.sentence{padding:18px 45px 18px 8px;grid-template-columns:22px 1fr;gap:7px}.en{font-size:19px;line-height:1.6}.stamp{display:none}.zh{font-size:13px}.favorite-button{right:5px;top:16px}.favorite-card{padding:19px}.form-grid{grid-template-columns:1fr;gap:0}.admin-list{grid-template-columns:1fr}.panel,.editor{padding:20px}.player{padding:15px 15px calc(15px + env(safe-area-inset-bottom))}.player-inner{gap:9px}.play-button{width:41px;height:41px}.icon-button{font-size:12px}.player-info{font-size:10px;gap:8px}#status{font-size:10px}.seek-row{gap:7px;font-size:9px}.small-tabs{gap:13px}.toolbar{gap:12px}.toast{top:75px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Controls keep their light border when focused; no browser outline or inset ring. */
:where(a,button,input,textarea,select,summary,[tabindex],[contenteditable]):focus,
:where(a,button,input,textarea,select,summary,[tabindex],[contenteditable]):focus-visible,
:where(a,button,input,textarea,select,summary,[tabindex],[contenteditable]):active {
  outline: none;
  outline-offset: 0;
}
input:not([type=range]):not([type=checkbox]):focus,
textarea:focus,
select:focus {
  border-color: #d9dfd1;
  box-shadow: none;
  background-color: #f8fbf5;
}
select {
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='m2 2 4 4 4-4' fill='none' stroke='%237c827c' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}
input[type=file]::file-selector-button {
  border: 1px solid #d9dfd1;
  border-radius: 5px;
  background: #f8f7f2;
  color: #253a32;
  padding: 7px 10px;
  margin-right: 10px;
  font: inherit;
  cursor: pointer;
}
input[type=checkbox] {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  border: 1px solid #c5cfbd;
  border-radius: 4px;
  background: white;
  display: inline-grid;
  place-content: center;
  cursor: pointer;
}
input[type=checkbox]:checked { background: var(--green); border-color: var(--green); }
input[type=checkbox]:checked::after {
  content: '';
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: translateY(-1px) rotate(45deg);
}
input[type=checkbox]:focus-visible { background-color: #e8eee4; }
input[type=checkbox]:checked:focus-visible { background-color: #346c50; }
/* Keyboard navigation remains visible using a soft fill instead of a dark ring. */
:where(a,button,summary):focus-visible { background-color: #e8eee4; }
.button.primary:focus-visible,
.play-button:focus-visible { background-color: #346c50; }

.course-card { overflow:hidden; }
.course-artwork { aspect-ratio:16/8;margin:-29px -29px 25px;background:#e3eade;overflow:hidden; }
.course-artwork img { display:block;width:100%;height:100%;object-fit:cover; }
.course-artwork.placeholder { display:flex;align-items:center;justify-content:center;background:linear-gradient(130deg,#e0e9df,#f0eee2);color:#8c9c85;letter-spacing:4px;font-size:11px; }
.course-card-label { display:flex;gap:15px;justify-content:space-between;align-items:center; }
.learning-course-issue { font-size:11px;color:var(--green);padding:5px 8px;background:#edf0e6;border-radius:4px; }
.learning-course-search { margin:0 0 25px;max-width:450px; }
.course-load-more { text-align:center;margin-top:30px; }
.course-detail-cover { display:block;width:240px;max-width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:9px;margin-top:20px; }
@media(max-width:600px){.course-artwork { margin:-24px -24px 20px; }}

.player-close { display:grid;place-items:center;flex-shrink:0;width:40px;height:40px;padding:0;margin-left:4px;border:0;border-radius:50%;color:#7e8875;background:transparent;cursor:pointer; }
.player-close:hover,.player-close:focus-visible { color:var(--green);background:#edf1e7; }
.reading-lift { position:fixed;right:24px;bottom:calc(var(--reading-lift-bottom,120px) + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:8px;z-index:6; }
.reading-lift-button { display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;width:66px;min-height:62px;padding:10px 5px;background:var(--white);color:var(--green);border:1px solid var(--line);border-radius:10px;box-shadow:0 4px 16px #253a3210;cursor:pointer;font-size:11px; }
.reading-lift-button:hover,.reading-lift-button:focus-visible { background:#edf1e7;border-color:#a8bba0;outline:none; }
.reading-lift-button:disabled { opacity:.5;cursor:default; }
@media(max-width:600px){.reading-lift { right:12px;gap:6px; }.reading-lift-button { width:54px;min-height:53px;padding:7px 3px;font-size:10px;gap:3px; }}
.player-navigable { cursor:pointer; }
a#player-title { display:block;min-width:0; }
a#player-title:hover,a#player-title:focus-visible { text-decoration:underline;text-underline-offset:3px;outline:none;color:var(--green); }
.play-button .is-paused-icon { display:flex;align-items:center;justify-content:center;gap:5px;height:18px; }
.play-button .is-paused-icon::before,.play-button .is-paused-icon::after { content:'';display:block;width:3px;height:16px;background:currentColor;border-radius:1px; }
.player-inner #previous,.player-inner #next { position:relative; }
.player-inner #previous::after,.player-inner #next::after { content:'';position:absolute;left:50%;top:50%;width:30px;height:44px;transform:translate(-50%,-50%); }
.player-inner #previous,.player-inner #next { font-size:16px; }
.player-inner #previous::after,.player-inner #next::after { width:32px;height:44px;background:radial-gradient(circle at center,currentColor 0 16px,transparent 16.5px);opacity:.08; }
.player-inner #previous:hover::after,.player-inner #next:hover::after,.player-inner #previous:focus-visible::after,.player-inner #next:focus-visible::after { opacity:.16; }
.player-settings-button { border:1px solid var(--line);background:transparent;color:var(--green);border-radius:6px;padding:8px 10px;font-size:11px;white-space:nowrap;cursor:pointer; }
.playback-settings-dialog { width:540px;max-width:calc(100% - 28px);max-height:85vh;overflow:auto;border:1px solid #dce3d6;border-radius:14px;padding:25px;color:var(--ink);background:var(--white); }
.playback-settings-dialog::backdrop { background:#17283a60; }
.playback-settings-heading { display:flex;align-items:center;justify-content:space-between; }
.playback-settings-heading h2 { margin:0; }
.playback-settings-dialog h3 { font-size:14px;border-top:1px solid var(--line);padding-top:17px;margin:18px 0 5px; }
.playback-settings-summary { background:#f1f4ed;border-radius:7px;padding:12px;font-size:12px;color:var(--muted); }
.playback-settings-actions { display:flex;justify-content:flex-end;gap:10px;margin-top:20px; }
@media(max-width:600px){.player-settings-button { padding:7px 5px;font-size:10px; }.playback-settings-dialog { padding:20px; }.playback-settings-dialog .form-grid { grid-template-columns:1fr 1fr;gap:12px; }.player-inner { gap:7px; }}