:root{
  --green:#2f8f4e;
  --green-dark:#246e3d;
  --bg:#f4f1e8;
  --paper:#fffdf7;
  --ink:#2b2b2b;
  --muted:#7a7a7a;
  --shadow:0 6px 20px rgba(0,0,0,.12);
  --card-border:#ece7da;
  --tabs-bg:#fff;
  --tabs-border:#e6e1d4;
  --notice-bg:#fff;
  --notice-border:#dce8df;
  --notice-text:#444;
  --cover-bg:#e9e4d6;
  --reader-bg:#f4f1e8;
  --reader-bar:#fff;
  --reader-bar-text:#2b2b2b;
  --reader-bar-border:#e6e1d4;
  --canvas-wrap-bg:var(--paper);
  --canvas-shadow:0 10px 40px rgba(0,0,0,.15);
  --nav-arrow-bg:rgba(47,143,78,.12);
  --nav-arrow-color:var(--green-dark);
  --nav-arrow-hover:rgba(47,143,78,.22);
  --tab-hover:#eaf5ed;
  --topbar-from:var(--green);
  --topbar-to:var(--green-dark);
  --search-bg:#fff;
  --search-text:#2b2b2b;
  --fab-bg:#fff;
  --fab-ink:#2b2b2b;
  --fab-shadow:0 4px 18px rgba(0,0,0,.18);
}

html.dark-mode{
  --bg:#14171c;
  --paper:#22262e;
  --ink:#e3e6eb;
  --muted:#9aa3ad;
  --shadow:0 8px 24px rgba(0,0,0,.45);
  --card-border:#353b45;
  --tabs-bg:#1c2027;
  --tabs-border:#2f3540;
  --notice-bg:#22262e;
  --notice-border:#3d5248;
  --notice-text:#c8ced6;
  --cover-bg:#2a3039;
  --reader-bg:#0f1115;
  --reader-bar:#181b21;
  --reader-bar-text:#eef1f4;
  --reader-bar-border:#2f3540;
  --canvas-wrap-bg:#1a1d24;
  --canvas-shadow:0 10px 40px rgba(0,0,0,.6);
  --nav-arrow-bg:rgba(255,255,255,.1);
  --nav-arrow-color:#fff;
  --nav-arrow-hover:rgba(255,255,255,.22);
  --tab-hover:#263028;
  --topbar-from:#1a3d2a;
  --topbar-to:#122b1d;
  --search-bg:rgba(255,255,255,.1);
  --search-text:#eef1f4;
  --fab-bg:#2a3140;
  --fab-ink:#eef1f4;
  --fab-shadow:0 4px 20px rgba(0,0,0,.5);
}

*{box-sizing:border-box;}
html,body{margin:0;height:100%;}
body{
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--ink);
  display:flex;
  flex-direction:column;
  min-height:100vh;
  transition:background-color .25s ease,color .25s ease;
}
.hidden{display:none !important;}

/* 顶部栏 */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:12px 20px;
  background:linear-gradient(135deg,var(--topbar-from),var(--topbar-to));
  color:#fff;box-shadow:var(--shadow);position:sticky;top:0;z-index:20;
}
.brand{display:flex;align-items:center;gap:10px;cursor:pointer;font-weight:700;font-size:20px;}
.brand .leaf{font-size:24px;flex-shrink:0;}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0;}
.brand-title{font-size:18px;font-weight:700;}
.brand-kid{
  font-size:13px;font-weight:500;opacity:.88;letter-spacing:.02em;
}
.search-box input{
  border:none;border-radius:20px;padding:8px 16px;width:240px;max-width:50vw;
  font-size:14px;outline:none;background:var(--search-bg);color:var(--search-text);
  transition:background-color .25s,color .25s;
}
.search-box input::placeholder{color:var(--muted);}

/* 书架 */
.shelf-view{flex:1;display:flex;flex-direction:column;}

.notice-bar{
  display:flex;align-items:flex-start;gap:10px;
  margin:12px 16px 0;padding:12px 14px;
  background:var(--notice-bg);border:1px solid var(--notice-border);border-left:4px solid var(--green);
  border-radius:10px;box-shadow:var(--shadow);
  transition:background-color .25s,border-color .25s;
}
.notice-body{flex:1;font-size:13px;line-height:1.55;color:var(--notice-text);min-width:0;}
.notice-body p{margin:0 0 6px;}
.notice-title{font-weight:700;color:var(--green-dark);font-size:14px;margin-bottom:8px !important;}
.notice-body ul{margin:0 0 6px;padding-left:18px;}
.notice-body li{margin-bottom:2px;}
.notice-tip{font-size:12px;color:var(--muted);margin-bottom:0 !important;}
.notice-close{
  flex:none;width:28px;height:28px;border:none;border-radius:50%;
  background:var(--tab-hover);color:var(--muted);font-size:20px;line-height:1;cursor:pointer;
  display:flex;align-items:center;justify-content:center;padding:0;
}
.notice-close:hover{filter:brightness(.95);}

.stage-tabs{
  display:flex;flex-wrap:wrap;gap:8px;padding:14px 20px;
  background:var(--tabs-bg);border-bottom:1px solid var(--tabs-border);
  position:sticky;top:60px;z-index:10;
  transition:background-color .25s,border-color .25s;
}
.stage-tab{
  border:1px solid var(--green);background:var(--tabs-bg);color:var(--green);
  padding:6px 14px;border-radius:18px;cursor:pointer;font-size:14px;font-weight:600;
  transition:.15s;
}
.stage-tab:hover{background:var(--tab-hover);}
.stage-tab.active{background:var(--green);color:#fff;}

.shelf{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
  gap:18px;padding:22px;max-width:1400px;margin:0 auto;width:100%;
}
.book-card{
  background:var(--paper);border-radius:10px;box-shadow:var(--shadow);
  cursor:pointer;overflow:hidden;display:flex;flex-direction:column;
  transition:transform .15s, box-shadow .15s, background-color .25s;
  border:1px solid var(--card-border);
}
.book-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(0,0,0,.18);}
.book-cover{
  position:relative;aspect-ratio:3/4;background:var(--cover-bg);
  display:flex;align-items:center;justify-content:center;overflow:hidden;
  transition:background-color .25s;
}
.book-cover canvas{width:100%;height:100%;object-fit:cover;display:block;}
.book-cover .cover-fallback{
  font-size:40px;color:#bcae8c;
}
.book-badge{
  position:absolute;top:8px;left:8px;background:var(--green);color:#fff;
  font-size:12px;font-weight:700;padding:2px 8px;border-radius:10px;
}
.book-audio-flag{
  position:absolute;top:8px;right:8px;background:#ff8c3b;color:#fff;
  font-size:12px;padding:2px 7px;border-radius:10px;
}
.book-meta{padding:10px;}
.book-title{font-size:14px;font-weight:600;line-height:1.3;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:36px;}

/* 阅读器 */
.reader-view{flex:1;display:flex;flex-direction:column;background:var(--reader-bg);transition:background-color .25s;}
.reader-toolbar{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 16px;background:var(--reader-bar);color:var(--reader-bar-text);
  border-bottom:1px solid var(--reader-bar-border);
  transition:background-color .25s,color .25s,border-color .25s;
}
.reader-title{flex:1;text-align:center;font-weight:600;font-size:16px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.reader-tools{display:flex;gap:8px;}
.btn{
  background:var(--green);color:#fff;border:none;border-radius:8px;
  padding:8px 14px;font-size:14px;cursor:pointer;transition:.15s;
}
.btn:hover{background:var(--green-dark);}

.stage-pane{
  flex:1;display:flex;align-items:stretch;justify-content:center;
  position:relative;padding:16px;overflow:hidden;min-height:0;
}
.book-canvas-wrap{
  position:relative;background:var(--canvas-wrap-bg);box-shadow:var(--canvas-shadow);
  border-radius:4px;max-width:100%;max-height:100%;
  flex:1;min-height:0;min-width:0;overflow:hidden;
  display:flex;flex-direction:column;
  transition:background-color .25s,box-shadow .25s;
}
.page-viewport{
  flex:1;min-height:0;min-width:0;
  width:100%;overflow:hidden;touch-action:none;
  position:relative;
}
.page-track{
  display:flex;height:100%;
  will-change:transform;
  backface-visibility:hidden;
}
.page-track.animating{
  transition:transform .28s cubic-bezier(.22,.61,.36,1);
}
.page-slide{
  flex:0 0 auto;height:100%;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.page-slide canvas{
  display:block;max-width:100%;max-height:100%;border-radius:4px;
}
.loading{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:var(--muted);font-size:15px;z-index:2;pointer-events:none;
}

.nav-arrow{
  background:var(--nav-arrow-bg);color:var(--nav-arrow-color);border:none;
  width:54px;height:90px;font-size:40px;cursor:pointer;border-radius:8px;
  flex:none;transition:.15s;
}
.nav-arrow:hover{background:var(--nav-arrow-hover);}
.nav-arrow:disabled{opacity:.25;cursor:default;}

.reader-footer{
  display:flex;align-items:center;gap:16px;padding:12px 20px;
  background:var(--reader-bar);color:var(--reader-bar-text);
  border-top:1px solid var(--reader-bar-border);
  flex-wrap:wrap;justify-content:center;
  transition:background-color .25s,color .25s,border-color .25s;
}
#pageSlider{flex:1;min-width:160px;max-width:480px;accent-color:var(--green);}
.page-indicator{font-size:14px;min-width:70px;text-align:center;}
.audio-wrap audio{height:36px;vertical-align:middle;}

.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%);
  background:#222;color:#fff;padding:10px 18px;border-radius:8px;
  box-shadow:var(--shadow);z-index:50;font-size:14px;
}

/* 悬浮护眼 / 黑夜模式 */
.theme-fab{
  position:fixed;right:16px;bottom:24px;z-index:45;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;width:52px;height:52px;padding:6px 4px;
  border:none;border-radius:50%;cursor:pointer;
  background:var(--fab-bg);color:var(--fab-ink);
  box-shadow:var(--fab-shadow);
  transition:transform .15s,background-color .25s,color .25s,box-shadow .25s;
}
.theme-fab:hover{transform:scale(1.06);}
.theme-fab:active{transform:scale(.96);}
.theme-fab-icon{font-size:20px;line-height:1;}
.theme-fab-label{font-size:10px;font-weight:600;line-height:1;opacity:.85;}

html.dark-mode .theme-fab-icon{filter:none;}
html.dark-mode .page-slide canvas{
  filter:brightness(.94) contrast(.98);
  transition:filter .25s ease;
}

@media (max-width:600px){
  .topbar{padding:8px 12px;gap:10px;}
  .brand-text{display:flex;}
  .brand-title{display:none;}
  .brand-kid{font-size:15px;font-weight:600;opacity:1;}
  .search-box{flex:1;}
  .search-box input{width:100%;max-width:none;}
  .notice-bar{margin:8px 10px 0;padding:10px 12px;}
  .notice-body{font-size:12px;}
  .notice-title{font-size:13px;}

  /* 阅读器占满屏幕，绘本尽量放大 */
  body.reader-open{overflow:hidden;}
  .reader-view{
    position:fixed;inset:0;z-index:30;
    height:100dvh;height:100vh;
  }
  .reader-toolbar{padding:8px 10px;gap:6px;}
  .reader-title{font-size:14px;}
  .reader-tools .btn{padding:6px 10px;font-size:13px;}
  .back-btn{padding:6px 10px;font-size:13px;}

  .stage-pane{padding:0;flex:1;}
  .nav-arrow{display:none;}
  .book-canvas-wrap{
    box-shadow:none;border-radius:0;background:var(--reader-bg);
    width:100%;height:100%;max-width:100%;max-height:100%;
  }
  .page-slide canvas{border-radius:0;}

  .reader-footer{padding:8px 12px;gap:10px;}
  .page-indicator{font-size:13px;min-width:56px;}
  .audio-wrap{width:100%;text-align:center;}
  .audio-wrap audio{width:100%;max-width:100%;height:32px;}

  .theme-fab{right:12px;bottom:16px;width:48px;height:48px;}
  body.reader-open .theme-fab{bottom:78px;}
}