/* =========================================================
   静阅 · TXT 小说阅读器
   ========================================================= */
* { box-sizing: border-box; }
[hidden] { display: none !important; }

:root {
  /* 由 JS 动态覆盖的阅读参数 */
  --nr-fs: 19px;
  --nr-lh: 1.9;
  --nr-ls: 0.4px;
  --nr-measure: 38;
  --nr-pw: 640px;
  --nr-gap: 52px;
  --nr-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  /* 主题取色：浅色主题用深色纹理，深色主题覆盖为浅色 */
  --nr-tex-c: rgba(0, 0, 0, .045);
  --nr-tex-img: none;
  --nr-tex-size: auto;
}

html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  background: var(--nr-bg);
  color: var(--nr-text);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  transition: background .25s ease, color .25s ease;
}

/* =========================================================
   主题体系（两套，互相独立）
   · 主界面：body[data-app-theme]      —— 书架/顶栏/侧栏/设置面板
   · 阅读区：#viewport[data-read-theme] —— 正文
   阅读区的配色声明在 #viewport 上，会覆盖 body 的值，
   所以「改阅读主题」不会影响主界面。
   ========================================================= */

/* ---------- 主界面主题（4 套） ---------- */
body[data-app-theme="fresh"] {
  --nr-bg:#eef5ec; --nr-text:#2c3a2a; --nr-dim:#6d7d68;
  --nr-panel:#ffffff; --nr-panel-2:#e2ecdf; --nr-border:rgba(44,58,42,.11);
  --nr-accent:#4a8f5b; --nr-accent-soft:rgba(74,143,91,.13);
  --nr-hl:#cfe9c8; --nr-shadow:0 10px 30px rgba(40,80,50,.10);
  --nr-shelf-grad:
    radial-gradient(1100px 520px at 10% -10%, rgba(122,190,140,.30), transparent 62%),
    radial-gradient(760px 420px at 100% 0%, rgba(168,214,158,.26), transparent 58%);
  --nr-tex-c: rgba(30,70,40,.05);
}
body[data-app-theme="light"] {
  --nr-bg:#f4f6f4; --nr-text:#262b26; --nr-dim:#78807a;
  --nr-panel:#ffffff; --nr-panel-2:#eaeeea; --nr-border:rgba(0,0,0,.09);
  --nr-accent:#3f8256; --nr-accent-soft:rgba(63,130,86,.11);
  --nr-hl:#e6f0e2; --nr-shadow:0 10px 30px rgba(40,50,40,.09);
  --nr-shelf-grad:
    radial-gradient(1000px 460px at 12% -12%, rgba(120,170,130,.16), transparent 62%);
  --nr-tex-c: rgba(0,0,0,.045);
}
body[data-app-theme="mint"] {
  --nr-bg:#e6f2f0; --nr-text:#22403c; --nr-dim:#65817c;
  --nr-panel:#ffffff; --nr-panel-2:#d8ebe8; --nr-border:rgba(30,70,64,.11);
  --nr-accent:#2f8f83; --nr-accent-soft:rgba(47,143,131,.13);
  --nr-hl:#c9eae3; --nr-shadow:0 10px 30px rgba(30,80,75,.10);
  --nr-shelf-grad:
    radial-gradient(1100px 520px at 8% -10%, rgba(90,190,175,.28), transparent 62%),
    radial-gradient(700px 400px at 100% 0%, rgba(150,215,205,.24), transparent 58%);
  --nr-tex-c: rgba(20,70,65,.05);
}
body[data-app-theme="dark"] {
  --nr-bg:#14181a; --nr-text:#b9c2c4; --nr-dim:#78837f;
  --nr-panel:#1c2224; --nr-panel-2:#262d2f; --nr-border:rgba(255,255,255,.09);
  --nr-accent:#6fbf8b; --nr-accent-soft:rgba(111,191,139,.15);
  --nr-hl:#3d5240; --nr-shadow:0 10px 30px rgba(0,0,0,.45);
  --nr-shelf-grad:
    radial-gradient(1000px 500px at 10% -10%, rgba(80,160,110,.18), transparent 62%);
  --nr-tex-c: rgba(255,255,255,.045);
}

/* ---------- 阅读区主题（13 套） ---------- */
#viewport[data-read-theme="freshgreen"] {
  --nr-bg:#e8f3e4; --nr-text:#33422f; --nr-dim:#74856d;
  --nr-panel:#dfeeda; --nr-panel-2:#d3e7cd; --nr-border:rgba(50,70,45,.13);
  --nr-accent:#4a8f5b; --nr-accent-soft:rgba(74,143,91,.13);
  --nr-hl:#d6eec4; --nr-shadow:0 10px 30px rgba(40,80,50,.12);
  --nr-tex-c: rgba(30,70,40,.05);
}
#viewport[data-read-theme="paper"] {
  --nr-bg:#faf6ee; --nr-text:#3b3226; --nr-dim:#8b7f6c;
  --nr-panel:#f3ecdf; --nr-panel-2:#ebe1cf; --nr-border:rgba(0,0,0,.09);
  --nr-accent:#a5673f; --nr-accent-soft:rgba(165,103,63,.12);
  --nr-hl:#ffe08a; --nr-shadow:0 10px 30px rgba(90,70,40,.12);
  --nr-tex-c: rgba(0,0,0,.045);
}
#viewport[data-read-theme="eye"] {
  --nr-bg:#c7edcc; --nr-text:#22331f; --nr-dim:#5c7355;
  --nr-panel:#bce5c2; --nr-panel-2:#b0dcb8; --nr-border:rgba(0,0,0,.10);
  --nr-accent:#2f7d43; --nr-accent-soft:rgba(47,125,67,.14);
  --nr-hl:#ffe98a; --nr-shadow:0 10px 30px rgba(30,70,40,.14);
  --nr-tex-c: rgba(0,0,0,.05);
}
#viewport[data-read-theme="day"] {
  --nr-bg:#ffffff; --nr-text:#1f2328; --nr-dim:#8a9099;
  --nr-panel:#f6f7f9; --nr-panel-2:#eef0f3; --nr-border:rgba(0,0,0,.09);
  --nr-accent:#2f6fed; --nr-accent-soft:rgba(47,111,237,.10);
  --nr-hl:#ffe58f; --nr-shadow:0 10px 30px rgba(20,30,60,.10);
  --nr-tex-c: rgba(0,0,0,.045);
}
#viewport[data-read-theme="gray"] {
  --nr-bg:#e6e8ea; --nr-text:#24282c; --nr-dim:#767c83;
  --nr-panel:#dcdfe2; --nr-panel-2:#d2d6da; --nr-border:rgba(0,0,0,.10);
  --nr-accent:#4a5568; --nr-accent-soft:rgba(74,85,104,.12);
  --nr-hl:#ffe08a; --nr-shadow:0 10px 30px rgba(40,45,55,.12);
  --nr-tex-c: rgba(0,0,0,.045);
}
#viewport[data-read-theme="sepia"] {
  --nr-bg:#f0e2c8; --nr-text:#4a3b2a; --nr-dim:#8b7a61;
  --nr-panel:#e8d7b9; --nr-panel-2:#dfcba8; --nr-border:rgba(80,60,30,.14);
  --nr-accent:#96622c; --nr-accent-soft:rgba(150,98,44,.13);
  --nr-hl:#f5d98a; --nr-shadow:0 10px 30px rgba(90,70,40,.16);
  --nr-tex-c: rgba(80,60,20,.05);
}
#viewport[data-read-theme="bamboo"] {
  --nr-bg:#dfe9dc; --nr-text:#2b3529; --nr-dim:#68755f;
  --nr-panel:#d2e0ce; --nr-panel-2:#c5d7c1; --nr-border:rgba(30,60,30,.12);
  --nr-accent:#4a7a4a; --nr-accent-soft:rgba(74,122,74,.14);
  --nr-hl:#f0e08a; --nr-shadow:0 10px 30px rgba(40,70,40,.14);
  --nr-tex-c: rgba(20,60,20,.05);
}
#viewport[data-read-theme="bluegray"] {
  --nr-bg:#dde6ee; --nr-text:#24303c; --nr-dim:#68798a;
  --nr-panel:#d0dce7; --nr-panel-2:#c3d2e0; --nr-border:rgba(20,40,60,.11);
  --nr-accent:#3a6b96; --nr-accent-soft:rgba(58,107,150,.13);
  --nr-hl:#ffe08a; --nr-shadow:0 10px 30px rgba(30,50,80,.13);
  --nr-tex-c: rgba(20,40,60,.05);
}
#viewport[data-read-theme="rose"] {
  --nr-bg:#f3e6ec; --nr-text:#3d2b33; --nr-dim:#8b7380;
  --nr-panel:#ebdae2; --nr-panel-2:#e2cdd7; --nr-border:rgba(80,40,60,.11);
  --nr-accent:#a4557a; --nr-accent-soft:rgba(164,85,122,.12);
  --nr-hl:#ffdfc0; --nr-shadow:0 10px 30px rgba(90,50,70,.13);
  --nr-tex-c: rgba(80,30,50,.05);
}
#viewport[data-read-theme="solar"] {
  --nr-bg:#fdf3d8; --nr-text:#4a3f22; --nr-dim:#8f8259;
  --nr-panel:#f7ebc6; --nr-panel-2:#f0e2b3; --nr-border:rgba(90,70,20,.13);
  --nr-accent:#b8860b; --nr-accent-soft:rgba(184,134,11,.13);
  --nr-hl:#ffd766; --nr-shadow:0 10px 30px rgba(110,90,30,.15);
  --nr-tex-c: rgba(90,70,20,.05);
}
#viewport[data-read-theme="night"] {
  --nr-bg:#16181c; --nr-text:#b9bfc7; --nr-dim:#767d86;
  --nr-panel:#1e2126; --nr-panel-2:#262a30; --nr-border:rgba(255,255,255,.09);
  --nr-accent:#7ea6ff; --nr-accent-soft:rgba(126,166,255,.14);
  --nr-hl:#5d5423; --nr-shadow:0 10px 30px rgba(0,0,0,.45);
  --nr-tex-c: rgba(255,255,255,.045);
}
#viewport[data-read-theme="ink"] {
  --nr-bg:#0f1113; --nr-text:#a9b1ba; --nr-dim:#6b737c;
  --nr-panel:#171a1d; --nr-panel-2:#202428; --nr-border:rgba(255,255,255,.085);
  --nr-accent:#c8a45c; --nr-accent-soft:rgba(200,164,92,.14);
  --nr-hl:#4d4220; --nr-shadow:0 10px 30px rgba(0,0,0,.5);
  --nr-tex-c: rgba(255,255,255,.04);
}
#viewport[data-read-theme="ocean"] {
  --nr-bg:#12232e; --nr-text:#a8c4d4; --nr-dim:#5f7d8f;
  --nr-panel:#17303e; --nr-panel-2:#1e3a4a; --nr-border:rgba(255,255,255,.09);
  --nr-accent:#4fb3d9; --nr-accent-soft:rgba(79,179,217,.15);
  --nr-hl:#2f4c46; --nr-shadow:0 10px 30px rgba(0,0,0,.45);
  --nr-tex-c: rgba(255,255,255,.04);
}

/* ---------- 阅读区背景纹理（只作用于正文区域） ---------- */
#viewport[data-texture="paper"] {
  --nr-tex-img:
    repeating-linear-gradient(48deg, var(--nr-tex-c) 0 1px, transparent 1px 6px),
    repeating-linear-gradient(-42deg, var(--nr-tex-c) 0 1px, transparent 1px 9px);
  --nr-tex-size: auto;
}
#viewport[data-texture="grid"] {
  --nr-tex-img:
    repeating-linear-gradient(0deg, var(--nr-tex-c) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, var(--nr-tex-c) 0 1px, transparent 1px 28px);
  --nr-tex-size: auto;
}
#viewport[data-texture="dots"] {
  --nr-tex-img: radial-gradient(var(--nr-tex-c) 1.1px, transparent 1.2px);
  --nr-tex-size: 18px 18px;
}
#viewport[data-texture="glow"] {
  --nr-tex-img: radial-gradient(1100px 460px at 50% -10%, var(--nr-accent-soft), transparent 68%);
  --nr-tex-size: auto;
}

::selection { background: var(--nr-accent-soft); }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--nr-border); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--nr-dim); }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- 通用控件 ---------- */
.nr-btn {
  appearance: none; border: 1px solid transparent; cursor: pointer;
  font: inherit; font-size: 13.5px; padding: 8px 16px; border-radius: 9px;
  transition: .18s ease; white-space: nowrap;
}
.nr-btn-primary { background: var(--nr-accent); color: #fff; }
.nr-btn-primary:hover { filter: brightness(1.08); }
.nr-btn-primary:disabled { opacity: .5; cursor: not-allowed; filter: none; }
.nr-btn-ghost { background: transparent; color: var(--nr-text); border-color: var(--nr-border); }
.nr-btn-ghost:hover { background: var(--nr-accent-soft); border-color: var(--nr-accent); color: var(--nr-accent); }
.nr-block { width: 100%; }
.nr-link { background: none; border: 0; cursor: pointer; font: inherit; font-size: 12px; color: var(--nr-accent); padding: 0; }
.nr-mini-btn {
  border: 1px solid transparent; background: var(--nr-panel-2); color: var(--nr-dim); cursor: pointer;
  font: inherit; font-size: 11.5px; padding: 5px 9px; border-radius: 7px; white-space: nowrap; transition: .16s ease;
}
.nr-mini-btn:hover { color: var(--nr-accent); border-color: var(--nr-accent); }
.nr-mini-btn.is-on { background: var(--nr-accent); color: #fff; border-color: var(--nr-accent); }
.nr-mini-btn.is-on:hover { color: #fff; }

/* 设置面板里的子滑块（一组里放多档） */
.nr-sub { margin-top: 11px; }
.nr-sub > label { display: block; font-size: 12px; color: var(--nr-dim); margin-bottom: 7px; }
.nr-sub > label b { color: var(--nr-text); font-weight: 600; font-variant-numeric: tabular-nums; }
.nr-sub input[type="range"] { width: 100%; }

/* 自动翻页进行中的呼吸提示 */
body.autoplay #btnAuto { animation: nr-pulse 2.4s ease-in-out infinite; }
@keyframes nr-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }

.nr-icon-btn {
  width: 36px; height: 36px; flex: 0 0 36px; display: grid; place-items: center;
  border: 0; border-radius: 9px; background: transparent; color: var(--nr-text);
  cursor: pointer; transition: .18s ease;
}
.nr-icon-btn svg { width: 19px; height: 19px; }
.nr-icon-btn:hover { background: var(--nr-accent-soft); color: var(--nr-accent); }

/* =========================================================
   书架
   ========================================================= */
.nr-shelf {
  position: fixed; inset: 0; overflow: auto;
  background-color: var(--nr-bg);
  background-image: var(--nr-shelf-grad, none);
  background-repeat: no-repeat;
  background-size: cover;
}
.nr-shelf-inner { max-width: 1080px; margin: 0 auto; padding: 46px 26px 90px; }

.nr-brand { display: flex; align-items: center; gap: 16px; }
.nr-logo {
  width: 54px; height: 54px; flex: 0 0 54px; border-radius: 15px;
  background: var(--nr-accent); color: #fff; font-size: 26px; font-weight: 700;
  display: grid; place-items: center; box-shadow: var(--nr-shadow);
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
}
.nr-brand-text { flex: 1; min-width: 0; }
.nr-brand-text h1 { margin: 0; font-size: 23px; letter-spacing: 6px; font-weight: 600; }
.nr-brand-text p { margin: 5px 0 0; font-size: 12.5px; color: var(--nr-dim); letter-spacing: .6px; }
.nr-brand-actions { display: flex; gap: 10px; }

.nr-drop {
  margin: 30px 0 34px; padding: 30px 20px; border-radius: 16px;
  border: 1.6px dashed var(--nr-border); background: var(--nr-panel);
  display: flex; flex-direction: column; align-items: center; gap: 7px;
  color: var(--nr-dim); text-align: center; transition: .2s ease; cursor: pointer;
}
.nr-drop svg { width: 30px; height: 30px; color: var(--nr-accent); opacity: .85; }
.nr-drop strong { color: var(--nr-text); font-size: 15px; font-weight: 600; }
.nr-drop span { font-size: 12.5px; max-width: 560px; line-height: 1.6; }
.nr-drop:hover, .nr-drop.is-over { border-color: var(--nr-accent); background: var(--nr-accent-soft); }

.nr-drop-overlay {
  position: fixed; inset: 0; z-index: 90; display: none; place-items: center;
  background: var(--nr-accent-soft); backdrop-filter: blur(3px);
}
.nr-drop-overlay span {
  background: var(--nr-accent); color: #fff; padding: 16px 34px;
  border-radius: 14px; font-size: 16px; box-shadow: var(--nr-shadow);
}
body.is-dragging .nr-drop-overlay { display: grid; }

.nr-shelf-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.nr-shelf-head h2 { margin: 0; font-size: 15px; font-weight: 600; letter-spacing: .5px; }
.nr-shelf-head em { font-style: normal; font-size: 12.5px; color: var(--nr-dim); font-weight: 400; }
.nr-note { margin-left: auto; font-size: 12px; color: var(--nr-dim); }

.nr-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 16px; }

.nr-card {
  position: relative; display: flex; gap: 14px; padding: 16px;
  background: var(--nr-panel); border: 1px solid var(--nr-border);
  border-radius: 15px; cursor: pointer; transition: .2s ease; overflow: hidden;
}
.nr-card:hover { transform: translateY(-2px); box-shadow: var(--nr-shadow); border-color: var(--nr-accent); }
.nr-card-cover {
  width: 54px; height: 76px; flex: 0 0 54px; border-radius: 9px;
  background: linear-gradient(150deg, var(--nr-accent), var(--nr-accent-soft));
  color: #fff; display: grid; place-items: center; font-size: 22px; font-weight: 600;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif; box-shadow: inset 0 0 24px rgba(0,0,0,.12);
}
.nr-card-info { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.nr-card-info h3 {
  margin: 0; font-size: 15px; font-weight: 600; line-height: 1.35; padding-right: 26px;
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}
.nr-card-meta { font-size: 11.5px; color: var(--nr-dim); }
.nr-card-bar { height: 4px; border-radius: 99px; background: var(--nr-panel-2); overflow: hidden; margin-top: auto; }
.nr-card-bar i { display: block; height: 100%; background: var(--nr-accent); border-radius: 99px; transition: width .3s ease; }
.nr-card-pct { font-size: 11.5px; color: var(--nr-dim); display: flex; justify-content: space-between; gap: 8px; }
.nr-card-pct span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nr-card-ops { position: absolute; top: 9px; right: 9px; display: flex; gap: 2px; opacity: 0; transition: .18s ease; }
.nr-card:hover .nr-card-ops { opacity: 1; }
.nr-card-ops button {
  width: 28px; height: 28px; border-radius: 8px; border: 0; background: transparent;
  color: var(--nr-dim); cursor: pointer; display: grid; place-items: center;
}
.nr-card-ops button:hover { background: var(--nr-panel-2); color: var(--nr-accent); }
.nr-card-ops button.nr-del:hover { color: #c0392b; }
.nr-card-ops svg { width: 15px; height: 15px; }

.nr-empty { text-align: center; padding: 40px 0 10px; color: var(--nr-dim); }
.nr-empty p { margin: 0 0 6px; font-size: 15px; color: var(--nr-text); }
.nr-empty span { font-size: 12.5px; }

.nr-env-hint {
  display: flex; gap: 10px; align-items: flex-start; margin: 0 0 22px;
  padding: 12px 15px; border-radius: 12px; font-size: 12.5px; line-height: 1.7;
  background: var(--nr-accent-soft); border: 1px solid var(--nr-border); color: var(--nr-dim);
}
.nr-env-hint strong { flex: 0 0 auto; color: var(--nr-accent); font-weight: 600; }
.nr-env-hint code {
  font-family: ui-monospace, Consolas, monospace; font-size: 11.5px;
  background: var(--nr-bg); padding: 1px 6px; border-radius: 5px; color: var(--nr-text);
}

/* =========================================================
   阅读器
   ========================================================= */
.nr-reader {
  position: fixed; inset: 0; display: flex; flex-direction: column;
  background-color: var(--nr-bg);
}

.nr-topbar {
  display: flex; align-items: center; gap: 6px; padding: 8px 14px;
  border-bottom: 1px solid var(--nr-border); background: var(--nr-panel);
  flex: 0 0 auto; z-index: 20;
}
.nr-title-wrap { flex: 1; min-width: 0; text-align: center; padding: 0 8px; }
.nr-book-title { font-size: 13.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.5; }
.nr-chapter-title { font-size: 11.5px; color: var(--nr-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.4; }
.nr-top-actions { display: flex; align-items: center; gap: 4px; }
.nr-clock { font-size: 12px; color: var(--nr-dim); margin: 0 6px; font-variant-numeric: tabular-nums; }

.nr-body { flex: 1; display: flex; min-height: 0; position: relative; }

/* ---- 目录 ---- */
.nr-toc {
  width: 300px; flex: 0 0 300px; border-right: 1px solid var(--nr-border);
  background: var(--nr-panel); display: flex; flex-direction: column; min-height: 0;
  transition: margin-left .26s ease;
}
body:not(.toc-open) .nr-toc { margin-left: -300px; }
.nr-toc-head { padding: 12px 12px 8px; border-bottom: 1px solid var(--nr-border); }
.nr-search-box {
  display: flex; align-items: center; gap: 7px; padding: 7px 9px;
  background: var(--nr-bg); border: 1px solid var(--nr-border); border-radius: 9px;
}
.nr-search-box svg { width: 15px; height: 15px; color: var(--nr-dim); flex: 0 0 15px; }
.nr-search-box input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--nr-text); font: inherit; font-size: 13px; }
.nr-search-box input::placeholder { color: var(--nr-dim); }
.nr-toc-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 9px; font-size: 11.5px; color: var(--nr-dim); }
.nr-toc-actions { display: flex; align-items: center; gap: 10px; }
.nr-toc-actions .nr-link { color: var(--nr-dim); }
.nr-toc-actions .nr-link:hover { color: var(--nr-accent); }
.nr-toc-list { flex: 1; overflow: auto; padding: 6px 0 20px; scroll-behavior: smooth; }
.nr-toc-item {
  display: flex; gap: 8px; padding: 7px 14px; cursor: pointer; font-size: 13px;
  line-height: 1.5; color: var(--nr-text); border-left: 2.5px solid transparent; transition: .15s ease;
}
.nr-toc-item:hover { background: var(--nr-accent-soft); }
.nr-toc-item.is-active { background: var(--nr-accent-soft); border-left-color: var(--nr-accent); color: var(--nr-accent); font-weight: 600; }
.nr-toc-item .nr-idx { flex: 0 0 36px; color: var(--nr-dim); font-size: 11.5px; font-variant-numeric: tabular-nums; }
.nr-toc-item .nr-txt { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nr-toc-item.nr-hit .nr-txt { white-space: normal; }
.nr-snippet { font-size: 11.5px; color: var(--nr-dim); font-weight: 400; margin-top: 3px; display: block; }
.nr-snippet mark { background: var(--nr-hl); color: inherit; border-radius: 3px; padding: 0 1px; }

/* ---- 正文 ----
   阅读区自己上色：--nr-* 由 #viewport[data-read-theme] 提供，
   覆盖 body 上的主界面配色，所以两边互不影响。 */
.nr-viewport {
  flex: 1; overflow: auto; min-width: 0; position: relative;
  background-color: var(--nr-bg);
  background-image: var(--nr-tex-img);
  background-size: var(--nr-tex-size);
  transition: background-color .25s ease;
}
.nr-content {
  max-width: calc(var(--nr-measure) * 1em);
  margin: 0 auto; padding: 44px 22px 60px;
  font-size: var(--nr-fs); line-height: var(--nr-lh);
  letter-spacing: var(--nr-ls); font-family: var(--nr-font);
  color: var(--nr-text); text-align: justify; word-break: break-word;
}
.nr-content h2 {
  font-size: 1.32em; font-weight: 600; margin: 0 0 1.6em; padding-bottom: .6em;
  border-bottom: 1px solid var(--nr-border); letter-spacing: .06em; line-height: 1.5;
}
.nr-content p { margin: 0 0 .95em; }
body.indent-on .nr-content p { text-indent: 2em; margin-bottom: .35em; }
.nr-content p.nr-blank { color: var(--nr-dim); font-size: .9em; text-align: center; text-indent: 0 !important; }
.nr-content mark.nr-hl { background: var(--nr-hl); color: inherit; border-radius: 3px; padding: 1px 2px; }
.nr-content mark.nr-hl.nr-focus { background: var(--nr-accent); color: #fff; }
.nr-chapter-nav { display: flex; justify-content: space-between; gap: 12px; padding: 0 22px 70px; max-width: 760px; margin: 0 auto; }
.nr-chapter-nav .nr-btn { flex: 1; }

/* ---- 左右翻页模式 ---- */
.nr-viewport.page-mode { overflow-x: auto; overflow-y: hidden; scroll-behavior: auto; }
.nr-viewport.page-mode .nr-content {
  max-width: none; margin: 0; padding: 40px var(--nr-gap) 34px 0;
  column-width: var(--nr-pw); column-gap: var(--nr-gap);
  column-fill: auto; text-align: justify;
}
.nr-viewport.page-mode .nr-content > * { break-inside: avoid-column; }
.nr-viewport.page-mode .nr-content h2 { break-after: avoid-column; }
.nr-viewport.page-mode .nr-chapter-nav { display: none; }

.nr-page-tap {
  position: fixed; top: 56px; bottom: 32px; width: var(--nr-tap-w, 16%); z-index: 15; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  background: transparent; transition: background .2s ease;
}
.nr-page-tap-prev { left: 0; justify-content: flex-start; padding-left: 8px; }
.nr-page-tap-next { right: 0; justify-content: flex-end; padding-right: 8px; }
/* 中间区：宽度由左右点击区宽度挤出来，本身不显示任何东西 */
.nr-page-tap-mid { left: var(--nr-tap-w, 16%); right: var(--nr-tap-w, 16%); width: auto; }
.nr-page-tap span {
  font-size: 26px; line-height: 1; color: var(--nr-text); opacity: 0;
  background: var(--nr-panel); border: 1px solid var(--nr-border); border-radius: 50%;
  width: 34px; height: 34px; display: grid; place-items: center; transition: .2s ease;
}
.nr-page-tap:hover { background: linear-gradient(90deg, var(--nr-accent-soft), transparent); }
.nr-page-tap-next:hover { background: linear-gradient(270deg, var(--nr-accent-soft), transparent); }
.nr-page-tap:hover span { opacity: .9; }

/* ---- 状态栏 ---- */
.nr-statusbar {
  flex: 0 0 auto; display: flex; align-items: center; gap: 14px;
  padding: 7px 16px; border-top: 1px solid var(--nr-border);
  background: var(--nr-panel); font-size: 11.5px; color: var(--nr-dim);
}
.nr-progress { flex: 1; height: 4px; background: var(--nr-panel-2); border-radius: 99px; overflow: hidden; cursor: pointer; }
.nr-progress i { display: block; height: 100%; width: 0; background: var(--nr-accent); border-radius: 99px; }

/* ---- 设置抽屉 ---- */
.nr-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: 330px; max-width: 90vw; z-index: 60;
  background: var(--nr-panel); border-left: 1px solid var(--nr-border);
  transform: translateX(102%); transition: transform .28s cubic-bezier(.4,0,.2,1);
  display: flex; flex-direction: column; box-shadow: var(--nr-shadow);
}
body.settings-open .nr-drawer { transform: none; }
.nr-drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 14px 12px 18px; border-bottom: 1px solid var(--nr-border);
}
.nr-drawer-head h3 { margin: 0; font-size: 14.5px; font-weight: 600; }
.nr-drawer-body { flex: 1; overflow: auto; padding: 6px 18px 34px; }
.nr-group { padding: 16px 0; border-bottom: 1px solid var(--nr-border); }
.nr-group:last-child { border-bottom: 0; }
.nr-group > label { display: block; font-size: 12.5px; color: var(--nr-dim); margin-bottom: 11px; }
.nr-group > label b { color: var(--nr-text); font-weight: 600; font-variant-numeric: tabular-nums; }
.nr-group > label em {
  font-style: normal; font-size: 11px; color: var(--nr-dim);
  opacity: .8; margin-left: 5px; font-weight: 400;
}
.nr-themes-sm { grid-template-columns: repeat(4, 1fr); }

.nr-themes { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.nr-theme {
  aspect-ratio: 1 / 1; border-radius: 11px; cursor: pointer;
  background: var(--sw); color: var(--sw-t); border: 2px solid var(--nr-border);
  font-size: 12px; font-weight: 600; transition: .18s ease; display: grid; place-items: center; padding: 0;
}
.nr-theme i { font-style: normal; }
.nr-theme:hover { transform: translateY(-2px); }
.nr-theme.is-on { border-color: var(--nr-accent); box-shadow: 0 0 0 3px var(--nr-accent-soft); }

.nr-seg { display: flex; background: var(--nr-bg); border: 1px solid var(--nr-border); border-radius: 10px; padding: 3px; }
.nr-seg button {
  flex: 1; border: 0; background: transparent; color: var(--nr-dim); cursor: pointer;
  font: inherit; font-size: 12.5px; padding: 7px 0; border-radius: 7px; transition: .18s ease;
}
.nr-seg button:hover { color: var(--nr-text); }
.nr-seg button.is-on { background: var(--nr-accent); color: #fff; }
.nr-seg-sm button { font-size: 11.5px; padding: 6px 0; }

.nr-color-row { display: flex; align-items: center; gap: 9px; }
.nr-color-row input[type="color"] {
  width: 40px; height: 30px; padding: 0; border: 1px solid var(--nr-border);
  border-radius: 8px; background: var(--nr-bg); cursor: pointer; flex: 0 0 40px;
}
.nr-color-row input[type="color"]::-webkit-color-swatch-wrapper { padding: 3px; }
.nr-color-row input[type="color"]::-webkit-color-swatch { border: 0; border-radius: 5px; }
.nr-hex {
  flex: 1; min-width: 0; font: inherit; font-size: 12px; font-family: ui-monospace, Consolas, monospace;
  padding: 6px 9px; border-radius: 8px; border: 1px solid var(--nr-border);
  background: var(--nr-bg); color: var(--nr-text); outline: 0;
}
.nr-hex:focus { border-color: var(--nr-accent); }
.nr-check { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--nr-dim); cursor: pointer; white-space: nowrap; }
.nr-check input { position: absolute; opacity: 0; width: 0; height: 0; }
.nr-check i {
  width: 15px; height: 15px; flex: 0 0 15px; border-radius: 4px;
  border: 1.5px solid var(--nr-dim); display: grid; place-items: center; transition: .16s ease;
}
.nr-check input:checked + i { background: var(--nr-accent); border-color: var(--nr-accent); }
.nr-check input:checked + i::after { content: ""; width: 4px; height: 7px; border: solid #fff; border-width: 0 1.6px 1.6px 0; transform: rotate(45deg) translate(-1px, -1px); }

.nr-text-presets { display: flex; gap: 7px; margin-top: 11px; flex-wrap: wrap; }
.nr-text-presets button {
  width: 26px; height: 26px; border-radius: 8px; cursor: pointer;
  background: var(--c); border: 1.5px solid var(--nr-border); transition: .16s ease;
}
.nr-text-presets button:hover { transform: translateY(-2px); }
.nr-text-presets button.is-on { border-color: var(--nr-accent); box-shadow: 0 0 0 2px var(--nr-accent-soft); }

.nr-font-import { margin-top: 10px; }
.nr-font-list { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
.nr-font-item {
  display: flex; align-items: center; gap: 8px; padding: 6px 9px;
  background: var(--nr-bg); border: 1px solid var(--nr-border); border-radius: 8px; font-size: 12px;
}
.nr-font-item span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nr-font-item button { border: 0; background: transparent; color: var(--nr-dim); cursor: pointer; font-size: 14px; line-height: 1; padding: 2px 4px; }
.nr-font-item button:hover { color: #c0392b; }
.nr-font-item.is-on { border-color: var(--nr-accent); color: var(--nr-accent); }

input[type=range] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 4px;
  background: var(--nr-panel-2); border-radius: 99px; outline: 0; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: var(--nr-accent); border: 2px solid var(--nr-panel); cursor: grab;
  box-shadow: 0 1px 5px rgba(0,0,0,.22);
}

.nr-switch-row { display: flex; align-items: center; justify-content: space-between; }
.nr-switch-row > label:first-child { margin: 0; font-size: 13px; color: var(--nr-text); cursor: pointer; }
.nr-switch { position: relative; width: 40px; height: 22px; flex: 0 0 40px; cursor: pointer; }
.nr-switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.nr-switch i { position: absolute; inset: 0; background: var(--nr-panel-2); border-radius: 99px; transition: .2s ease; }
.nr-switch i::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px;
  border-radius: 50%; background: #fff; transition: .2s ease; box-shadow: 0 1px 3px rgba(0,0,0,.25);
}
.nr-switch input:checked + i { background: var(--nr-accent); }
.nr-switch input:checked + i::after { transform: translateX(18px); }

.nr-keys { display: flex; flex-direction: column; gap: 9px; font-size: 12px; color: var(--nr-dim); line-height: 1.6; }
.nr-keys kbd {
  display: inline-block; min-width: 20px; text-align: center; padding: 2px 5px; margin: 0 1px;
  font-family: ui-monospace, Consolas, monospace; font-size: 11px;
  background: var(--nr-bg); border: 1px solid var(--nr-border);
  border-bottom-width: 2px; border-radius: 5px; color: var(--nr-text);
}

.nr-mask { position: fixed; inset: 0; background: rgba(0,0,0,.28); z-index: 55; display: none; }
body.settings-open #drawerMask { display: block; }

/* =========================================================
   在线书源
   ========================================================= */
.nr-source {
  position: fixed; inset: 0; z-index: 80; display: flex; align-items: center; justify-content: center;
  padding: 24px; background: rgba(0,0,0,.42); backdrop-filter: blur(4px);
}
.nr-source-card {
  width: 100%; max-width: 660px; max-height: 88vh; display: flex; flex-direction: column;
  background: var(--nr-panel); border: 1px solid var(--nr-border);
  border-radius: 18px; box-shadow: var(--nr-shadow); overflow: hidden;
}
.nr-source-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 14px 12px 20px; border-bottom: 1px solid var(--nr-border);
}
.nr-source-head h3 { margin: 0; font-size: 15px; font-weight: 600; }
.nr-source-body { flex: 1; overflow: auto; padding: 18px 20px 24px; }

.nr-field { margin-bottom: 16px; }
.nr-field > label { display: block; font-size: 12.5px; color: var(--nr-dim); margin-bottom: 8px; }
.nr-field input[type="text"] {
  flex: 1; min-width: 0; font: inherit; font-size: 13px; padding: 9px 12px;
  border-radius: 9px; border: 1px solid var(--nr-border); background: var(--nr-bg);
  color: var(--nr-text); outline: 0;
}
.nr-field input[type="text"]:focus { border-color: var(--nr-accent); }
.nr-row { display: flex; align-items: center; gap: 9px; }
.nr-row-end { justify-content: flex-end; margin-top: 16px; flex-wrap: wrap; }
.nr-hint { margin: 8px 0 0; font-size: 11.5px; color: var(--nr-dim); line-height: 1.6; }
.nr-hint code {
  font-family: ui-monospace, Consolas, monospace; font-size: 11px;
  background: var(--nr-bg); padding: 1px 5px; border-radius: 4px; color: var(--nr-text);
}
.nr-hint.is-ok { color: #2f8f4e; }
.nr-hint.is-bad { color: #c0562b; }

.nr-src-book {
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
  padding: 12px 14px; border-radius: 11px; background: var(--nr-bg);
  border: 1px solid var(--nr-border); margin-bottom: 16px;
}
.nr-src-book strong { font-size: 14.5px; }
.nr-src-book span { font-size: 12px; color: var(--nr-dim); }

.nr-range-row input[type="number"] {
  width: 76px; font: inherit; font-size: 13px; padding: 7px 9px; text-align: center;
  border-radius: 8px; border: 1px solid var(--nr-border); background: var(--nr-bg);
  color: var(--nr-text); outline: 0;
}
.nr-range-row input[type="number"]:focus { border-color: var(--nr-accent); }
.nr-dash { color: var(--nr-dim); }

.nr-progress-line { margin: 18px 0 4px; }
.nr-bar { height: 6px; border-radius: 99px; background: var(--nr-panel-2); overflow: hidden; }
.nr-bar i { display: block; height: 100%; width: 0; background: var(--nr-accent); border-radius: 99px; transition: width .25s ease; }
.nr-progress-text { display: flex; justify-content: space-between; gap: 10px; margin-top: 8px; font-size: 11.5px; color: var(--nr-dim); }

.nr-src-list { margin-top: 20px; border-top: 1px solid var(--nr-border); padding-top: 14px; }
.nr-src-list summary { cursor: pointer; font-size: 13px; font-weight: 600; outline: 0; }
.nr-src-list summary::marker { color: var(--nr-accent); }
/* ---------- 抓取任务（断点续传） ---------- */
.nr-task-list { display: flex; flex-direction: column; gap: 8px; }
.nr-task {
  padding: 9px 11px; border: 1px solid var(--nr-border); border-radius: 10px;
  background: var(--nr-panel); font-size: 12.5px;
}
.nr-task-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.nr-task-head b { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nr-task-head span { color: var(--nr-dim); font-size: 11.5px; flex: 0 0 auto; }
.nr-task-bar { height: 4px; border-radius: 3px; background: var(--nr-border); margin: 7px 0 6px; overflow: hidden; }
.nr-task-bar i { display: block; height: 100%; background: var(--nr-accent); }
.nr-task-ops { display: flex; gap: 12px; }

/* ---------- 书源规则 ---------- */
.nr-rules-body { padding: 10px 0 2px; display: flex; flex-direction: column; gap: 9px; }
.nr-rule-list { display: flex; flex-direction: column; gap: 7px; }
.nr-rule {
  padding: 8px 10px; border: 1px solid var(--nr-border); border-radius: 9px;
  background: var(--nr-panel); font-size: 12.5px;
}
.nr-rule-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.nr-rule-head b { font-weight: 600; }
.nr-rule-head span { color: var(--nr-dim); font-size: 11px; }
.nr-rule-ops { display: flex; gap: 12px; margin-top: 4px; }
#ruleText {
  width: 100%; box-sizing: border-box; margin-top: 8px; padding: 9px 10px;
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; line-height: 1.55;
  color: var(--nr-text); background: var(--nr-panel-2);
  border: 1px solid var(--nr-border); border-radius: 9px; resize: vertical;
}
#ruleMsg.ok, #ruleMsg.ok { color: #4b7a3f; }
#ruleMsg.bad { color: #b4472f; }
.nr-field > label em {
  font-style: normal; font-size: 11px; color: var(--nr-dim); opacity: .8; margin-left: 5px;
}
.nr-src-group { margin-top: 14px; }
.nr-src-group > h4 { margin: 0 0 4px; font-size: 12.5px; color: var(--nr-accent); font-weight: 600; }
.nr-src-group > p { margin: 0 0 9px; font-size: 11.5px; color: var(--nr-dim); line-height: 1.6; }
.nr-src-item {
  display: block; width: 100%; text-align: left; cursor: pointer;
  padding: 9px 12px; border-radius: 9px; border: 1px solid var(--nr-border);
  background: var(--nr-bg); margin-bottom: 7px; transition: .16s ease;
}
.nr-src-item:hover { border-color: var(--nr-accent); background: var(--nr-accent-soft); }
.nr-src-item strong { display: block; font-size: 12.5px; color: var(--nr-text); font-weight: 600; }
.nr-src-item span { display: block; font-size: 11.5px; color: var(--nr-dim); margin-top: 3px; line-height: 1.55; }
.nr-src-item code { display: block; font-size: 11px; color: var(--nr-accent); margin-top: 4px; word-break: break-all; }

.nr-copyright {
  margin: 18px 0 0; padding: 12px 14px; border-radius: 10px;
  background: var(--nr-accent-soft); font-size: 11.5px; line-height: 1.75; color: var(--nr-dim);
}
.nr-copyright b { color: var(--nr-text); }

/* ---- 提示 ---- */
.nr-toast {
  position: fixed; left: 50%; bottom: 42px; transform: translate(-50%, 16px);
  background: var(--nr-accent); color: #fff; padding: 10px 20px; border-radius: 10px;
  font-size: 13px; opacity: 0; pointer-events: none; transition: .25s ease; z-index: 200;
  box-shadow: var(--nr-shadow); max-width: 80vw; text-align: center;
}
.nr-toast.is-on { opacity: 1; transform: translate(-50%, 0); }

.nr-loading {
  position: fixed; inset: 0; z-index: 150; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 16px;
  background: var(--nr-bg); opacity: .94; font-size: 13px; color: var(--nr-dim);
}
.nr-spinner {
  width: 30px; height: 30px; border-radius: 50%;
  border: 2.5px solid var(--nr-border); border-top-color: var(--nr-accent);
  animation: nr-spin .8s linear infinite;
}
@keyframes nr-spin { to { transform: rotate(360deg); } }

/* ---------- 响应式 ---------- */
/* 注意：这里不能再用 !important 强制展开目录。
   之前 `body.toc-always .nr-toc { margin-left: 0 !important }` 会让宽屏下
   侧栏目录永远关不掉（M 键和目录按钮全部失效）。现在 toc-always 只表示
   「进入阅读器时默认展开」，是否显示完全由 body.toc-open 决定。 */
@media (max-width: 1099px) {
  .nr-toc {
    position: fixed; top: 0; bottom: 0; left: 0; z-index: 58; margin-left: 0 !important;
    transform: translateX(-102%); transition: transform .26s cubic-bezier(.4,0,.2,1);
    box-shadow: var(--nr-shadow);
  }
  body.toc-open .nr-toc { transform: none; }
  body.toc-open #tocMask { display: block; }
}
@media (min-width: 1100px) {
  body:not(.toc-open) #tocMask { display: none !important; }
}
@media (max-width: 640px) {
  .nr-shelf-inner { padding: 30px 16px 70px; }
  .nr-brand { flex-wrap: wrap; }
  .nr-brand-actions { width: 100%; }
  .nr-brand-actions .nr-btn { flex: 1; }
  .nr-cards { grid-template-columns: 1fr; }
  .nr-content { padding: 26px 16px 40px; }
  .nr-clock { display: none; }
  .nr-top-actions .nr-icon-btn { width: 32px; flex-basis: 32px; }
  .nr-page-tap { width: 22%; }
  .nr-source { padding: 10px; }
  .nr-source-card { max-height: 94vh; border-radius: 14px; }
  .nr-range-row { flex-wrap: wrap; }
}

/* ============================================================
   v2.3 新增：无缝章节 / 骨架屏 / 虚拟列表 / 书架状态 / 诊断面板
   ============================================================ */

/* ---- 章节块与「接口气」 ----
   无缝模式下多章拼在一个滚动容器里，用一道虚线分隔；
   章首带过来的上一章末行用左侧竖线标出来，视觉上像"引文"。 */
.nr-sec + .nr-sec { border-top: 1px dashed var(--nr-border); margin-top: 42px; padding-top: 26px; }
.nr-seam-lead {
  font-size: .92em; color: var(--nr-dim); opacity: .8;
  margin: 0 0 20px; padding-left: 12px; border-left: 2px solid var(--nr-border);
}

/* ---- 骨架屏 + 渐显 ----
   大章节渲染要几十到上百毫秒，这期间先给一屏灰条，
   比留白更让人确信"在加载"。 */
.nr-skel { display: flex; flex-direction: column; gap: 17px; padding: 10px 0; }
.nr-skel i {
  display: block; height: 1em; border-radius: 5px;
  background: linear-gradient(90deg, var(--nr-panel-2) 25%, var(--nr-panel) 37%, var(--nr-panel-2) 63%);
  background-size: 400% 100%;
  animation: nr-skel 1.3s ease infinite;
}
@keyframes nr-skel { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
@keyframes nr-fadein { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }
.nr-content.nr-fade { animation: nr-fadein .17s ease-out; }
@media (prefers-reduced-motion: reduce) {
  .nr-skel i { animation: none; }
  .nr-content.nr-fade { animation: none; }
}

/* ---- 目录虚拟列表 ----
   行高必须固定，虚拟滚动的位置换算才对得上（TOC_ROW_H = 34）。 */
.nr-toc-list.vtoc .nr-toc-item {
  height: 34px; box-sizing: border-box; align-items: center; padding-top: 0; padding-bottom: 0;
}
.nr-vpad { height: 0; overflow: hidden; }

/* ---- 书架工具条与状态徽标 ---- */
.nr-shelf-tools {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  justify-content: space-between; margin: 6px 0 16px;
}
.nr-shelf-tools-right { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.nr-tag-input {
  padding: 6px 11px; font-size: 12.5px; border-radius: 9px;
  border: 1px solid var(--nr-border); background: var(--nr-panel); color: var(--nr-text);
  font-family: inherit; min-width: 120px;
}
.nr-tag-input:focus { outline: none; border-color: var(--nr-accent); }
.nr-card-badges { display: flex; flex-wrap: wrap; gap: 5px; margin: 3px 0 7px; }
.nr-badge {
  font-size: 11px; line-height: 1.6; padding: 0 8px; border-radius: 20px;
  border: 1px solid var(--nr-border); color: var(--nr-dim); white-space: nowrap;
}
.nr-badge-reading { color: #2f7d4f; border-color: #9ecfae; background: rgba(94, 180, 130, .13); }
.nr-badge-done { color: #4a6fa5; border-color: #a8c0dd; background: rgba(90, 140, 200, .13); }
.nr-badge-new { color: #a8551f; border-color: #e0b183; background: rgba(220, 150, 80, .15); }
.nr-badge-tag { color: inherit; opacity: .8; }

/* ---- 输入弹层（Electron 里没有 window.prompt） ---- */
.nr-prompt {
  position: fixed; inset: 0; z-index: 95; padding: 20px;
  background: rgba(20, 24, 22, .38);
  display: grid; place-items: center;
}
.nr-prompt[hidden] { display: none !important; }
.nr-prompt-card {
  width: min(430px, 100%); padding: 18px 18px 16px;
  background: var(--nr-panel); color: var(--nr-text);
  border: 1px solid var(--nr-border); border-radius: 14px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, .22);
}
.nr-prompt-card h4 { margin: 0 0 4px; font-size: 15px; }
.nr-prompt-card input {
  width: 100%; margin: 10px 0 14px; padding: 9px 12px; font-size: 14px;
  border: 1px solid var(--nr-border); border-radius: 9px;
  background: var(--nr-panel-2); color: inherit; font-family: inherit;
}
.nr-prompt-card input:focus { outline: none; border-color: var(--nr-accent); }

/* ---- 性能指标面板 ---- */
.nr-perf { display: flex; flex-direction: column; margin-bottom: 10px; }
.nr-perf-row {
  display: flex; justify-content: space-between; gap: 10px;
  font-size: 12.5px; padding: 6px 0; border-bottom: 1px dashed var(--nr-border);
}
.nr-perf-row b { font-weight: 600; font-variant-numeric: tabular-nums; }
.nr-perf-row.is-warn b { color: #c0392b; }
.nr-perf-verdict { margin-top: 9px; font-size: 12px; color: var(--nr-dim); }
.nr-perf-verdict p { margin: 3px 0; }

/* ---- 抓取诊断 ---- */
.nr-diag { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
.nr-diag-row {
  font-size: 12.5px; padding: 8px 11px; border-radius: 9px;
  border: 1px solid var(--nr-border); background: var(--nr-panel-2);
}
.nr-diag-row b { display: block; margin-bottom: 2px; }
.nr-diag-row span { color: var(--nr-dim); word-break: break-all; }
.nr-diag-row.is-ok { border-color: rgba(80, 170, 120, .55); }
.nr-diag-row.is-bad { border-color: rgba(200, 90, 70, .55); }
.nr-sub-inline { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--nr-dim); }
.nr-sub-inline input[type="range"] { width: 82px; }
.nr-sub-inline b { color: var(--nr-text); font-variant-numeric: tabular-nums; }

/* ============================================================
   安卓 / 移动端适配
   ------------------------------------------------------------
   桌面端是「窗口 + 侧栏目录 + 状态栏」，直接搬到手机上会挤成一团：
   顶栏七个控件塞不下、按钮太小点不中、顶部内容被状态栏压住。

   选择器一律以 html.is-android 打头，不是 body.is-android ——
   外壳的 onApplyWindowInsets 回调发生在页面开始加载之前，
   那时 document.body 还不存在，给 body 加类会直接抛异常，
   结果整个移动端样式一次都没生效过（看起来就是"没适配"）。
   现在外壳把类加在 documentElement 上，并且在页面加载完再补推一次。
   ============================================================ */

/* 系统栏高度由安卓外壳用 JS 注入。
   为什么不用 env(safe-area-inset-*)：Android WebView 对它的支持随版本飘，
   量不到就变成 0，顶栏会被状态栏压住；直接由外壳读取 WindowInsets 最可靠。 */
:root {
  --nr-safe-top: 0px;
  --nr-safe-bottom: 0px;
  --nr-android-topbar: 52px;    /* 手机上顶栏的实际高度（5+42+5），点击区要靠它定位 */
}

/* 安卓 WebView 默认"点哪闪哪"一块蓝色高亮，阅读时很刺眼 */
html.is-android, html.is-android * { -webkit-tap-highlight-color: transparent; }

/* 横向手势归 JS（做翻页动画），纵向留给原生滚动。
   touch-action 只约束触摸，桌面端用鼠标划选文字完全不受影响。 */
.nr-viewport { touch-action: pan-y; overscroll-behavior-x: none; }

/* 横向不许溢出：手机上只要有一个元素超宽，整页就能被左右拖着晃 */
html.is-android { overflow-x: hidden; }
html.is-android body { overflow-x: hidden; max-width: 100vw; }
html.is-android img, html.is-android svg, html.is-android video,
html.is-android input, html.is-android select { max-width: 100%; }

/* ---- 顶栏 ----
   桌面是 [返回][目录] 标题 [滚动][自动][全屏][设置] 七个控件，
   手机上 360px 根本放不下，标题会被压到只剩几个字。
   这里隐藏手机上冗余的「全屏」（系统栏本来就沉浸式，全屏没有意义），
   并收紧间距，把空间让给标题。 */
html.is-android .nr-topbar {
  padding: calc(5px + var(--nr-safe-top)) 8px 5px;
  gap: 2px;
  min-height: calc(var(--nr-android-topbar) + var(--nr-safe-top));
  box-sizing: border-box;
}
html.is-android #btnFull { display: none; }
html.is-android #btnAuto { font-size: 11px; padding: 6px 8px; }
html.is-android .nr-top-actions { gap: 2px; }
html.is-android .nr-title-wrap { padding: 0 4px; }
html.is-android .nr-book-title { font-size: 13px; }
html.is-android .nr-chapter-title { font-size: 10.5px; }

/* 触摸目标：手指比鼠标粗，36px 的点不准，给到 42px。
   注意顶栏总高度不变（原来 8+36+8，现在 5+42+5），正文不会被挤少。 */
html.is-android .nr-icon-btn { width: 42px; height: 42px; flex-basis: 42px; }
html.is-android .nr-icon-btn svg { width: 21px; height: 21px; }

/* 状态栏：底部避开手势条，否则进度条被压住划不动 */
html.is-android .nr-statusbar {
  gap: 10px;
  padding: 7px 12px calc(7px + var(--nr-safe-bottom));
  font-size: 11px;
}

/* 点击区：跟着顶栏实际高度走 */
html.is-android .nr-page-tap {
  top: calc(var(--nr-android-topbar) + var(--nr-safe-top));
  bottom: calc(38px + var(--nr-safe-bottom));
}

/* ---- 书架页 ----
   顶部要吃掉安全区，否则「我的书架」被状态栏压住；
   底部也是，否则最后一张卡片被手势条盖住点不到。 */
html.is-android .nr-shelf-inner {
  padding-top: calc(20px + var(--nr-safe-top));
  padding-bottom: calc(48px + var(--nr-safe-bottom));
}
/* 手机上没有物理键盘，快捷键说明整块去掉（连标题一起去掉，不留空块） */
html.is-android .nr-desktop-only { display: none; }

/* ---- 右侧面板（阅读设置 / 书源）：手机上接近全屏 ---- */
html.is-android .nr-drawer { width: min(100vw, 420px); max-width: 100vw; }
html.is-android .nr-drawer-body { padding-bottom: calc(18px + var(--nr-safe-bottom)); }
html.is-android .nr-source {
  padding: calc(8px + var(--nr-safe-top)) 8px calc(8px + var(--nr-safe-bottom));
}
html.is-android .nr-source-card { height: 100%; max-height: none; border-radius: 16px; }

/* 手机上滚动条不显示（手指滑动本身就有位置感，多一条竖条反而碍眼） */
html.is-android ::-webkit-scrollbar { width: 0; height: 0; }

/* 面板内边距在手机上收一点，把宽度留给内容 */
html.is-android .nr-drawer-head { padding: 12px 12px 10px 16px; }
html.is-android .nr-drawer-body { padding-left: 14px; padding-right: 14px; }
html.is-android .nr-source-head { padding: 12px 10px 10px 16px; }
html.is-android .nr-source-body { padding: 14px 14px 18px; }

/* 手机横屏：竖向空间只有 300~400px，顶栏和状态栏必须再压扁一点，
   否则正文只剩两三行。 */
@media (orientation: landscape) and (max-height: 520px) {
  html.is-android { --nr-android-topbar: 44px; }
  html.is-android .nr-icon-btn { width: 36px; height: 36px; flex-basis: 36px; }
  html.is-android .nr-icon-btn svg { width: 18px; height: 18px; }
  html.is-android .nr-statusbar { padding-top: 3px; padding-bottom: calc(3px + var(--nr-safe-bottom)); }
}

/* 手指比鼠标粗：640px 以下的点击区给窄一点，中间留够触发滑动/选字的空间 */
@media (max-width: 640px) {
  html.is-android .nr-page-tap { width: var(--nr-tap-w, 22%); }
  html.is-android .nr-page-tap-mid { left: var(--nr-tap-w, 22%); right: var(--nr-tap-w, 22%); }
  /* 手机上「上一章/下一章」按钮太占地，翻页靠手势和点击区就够 */
  html.is-android .nr-chapter-nav { display: none; }
  /* 分段按钮（字体/纹理/排序）在窄屏挤成一排会压缩文字，允许换行更耐看 */
  html.is-android .nr-seg { flex-wrap: wrap; }
  html.is-android .nr-seg button { flex: 1 1 30%; }
}

/* 手机竖屏 / 小屏平板：目录改成覆盖式，不要挤正文 */
@media (max-width: 820px) {
  html.is-android .nr-toc {
    position: fixed; top: 0; bottom: 0; left: 0; z-index: 60;
    width: min(84vw, 340px);
    padding-top: var(--nr-safe-top);
    padding-bottom: var(--nr-safe-bottom);
    box-shadow: 0 0 40px rgba(0, 0, 0, .18);
  }
}