:root {
  /* === 参数变量（由主题覆盖） === */
  --main-hue: 240;
  --main-chroma: 0.006;
  --main-lightness: 97%;
  /* 反色调计算 */

  --text-lightness: 0.1; /* 调整为0.9（90%），避免后续计算超限 */
  --text-color-gap: 0.1; /* 调整后计算为0.81（90%*0.9），在有效范围内 */

  /* === 派生颜色变量 === */
  --main-color: oklch(var(--main-lightness) var(--main-chroma) var(--main-hue));
  --bg-main: var(--main-color);
  --bg-viewer: oklch(calc(var(--main-lightness) * 0.95) var(--main-chroma) var(--main-hue));
  --bg-toc: oklch(calc(var(--main-lightness) * 0.90) var(--main-chroma) var(--main-hue));
  --bg-active: oklch(calc(var(--main-lightness) * 0.85) var(--main-chroma) var(--main-hue));
  --bg-hover: oklch(calc(var(--main-lightness) * 0.88) var(--main-chroma) var(--main-hue));
  --bg-chat-user: oklch(calc(var(--main-lightness) * 0.92) var(--main-chroma) var(--main-hue));
  --bg-main-transparent: color-mix(in oklch, var(--main-color) 80%, transparent);

  /* === 文本 === */
  --text-dark: oklch(var(--text-lightness) 0 0); /* 深灰色（C=0更安全） */
  --text-light: oklch(calc(var(--text-lightness) + var(--text-color-gap)) 0 0); /* 计算为0.81（90%*0.9） */
  --text-title: oklch(20% 0 0); /* 标题用深灰色 */
  --text-active: oklch(100% 0.1 50); /* 降低色度到0.1 */
  --text-author: oklch(calc(var(--text-lightness) + var(--text-color-gap)) 0.1 50); /* 修正括号并降低色度 */
  --text-thinking: oklch(100% 0.1 200); /* 降低色度到0.1 */

  /* === 边框与控件 === */
  --border-light: oklch(calc(var(--main-lightness) * 0.88) var(--main-chroma) var(--main-hue));
  --border-active: oklch(calc(var(--main-lightness) * 0.85) var(--main-chroma) var(--main-hue));
  --control-bg: var(--bg-main);
  --control-color: oklch(0% 0 0); /* 黑色 */
}

:root[data-theme="light"] {
  --main-hue: 240;
  --main-chroma: 0.006;
  --main-lightness: 97%;
}

:root[data-theme="dark"] {
  --main-hue: 240;
  --main-chroma: 0.01;
  --main-lightness: 20%;

  --text-lightness: 1;
  --text-color-gap: -0.1;
}

:root[data-theme="soft"] {
  --main-hue: 140;
  --main-chroma: 0.04;
  --main-lightness: 88%;

  --text-lightness: 0.1;
  --text-color-gap: 0.1;
}

html,
body {
    overflow: hidden;
}
body {
    font-family: sans-serif;
    margin: 0;
    background-color: var(--bg-main);
}

#content {
    flex: 1;
    align-items: center;
    background-color: var(--bg-main);
    display: flex;
    flex-direction: column;
    height: 100vh;
    justify-content: space-between;
    position: relative;
    text-align: center;
    z-index: 0;
}

.epub-container,
.epub-view {
    width: 100% !important;
}

.epub-view {
    padding-bottom: 50px !important;
}

#controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    z-index: 1000;
    pointer-events: none;
    display: flex;
    justify-content: space-between;
    padding: 0 10px;
}

#controls button {
    border: none;
    background: var(--bg-button);
    color: var(--text-light);
    cursor: pointer;
    font-size: 20px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    pointer-events: auto;
    box-shadow: var(--shadow-medium);
    opacity: 0.8;
}

#controls button:hover {
    background: var(--bg-button-hover);
    color: var(--text-dark);
    opacity: 1;
    transform: scale(1.1);
    box-shadow: var(--shadow-medium);
}

#main {
    display: flex;
}

css-tabs,
#reader-pal {
    display: flex;
    flex: 1;
    height: 100vh;
    flex-direction: column;
    overflow-y: auto;
}

#reader-pal #output {
    flex: 1;
}

#reader-pal #chat {
    display: flex;
    flex-direction: column;
    padding: 16px;
}

#reader-pal #chat #prompt {
    border: 1px solid var(--border-light);
    border-radius: 4px;
    font-family: sans-serif;
    font-size: 16px;
    padding: 16px;
    resize: none;
}

#reader-pal .message {
    padding-inline: 16px;
    padding-top: 1px;
}

#reader-pal .message.you {
    background-color: var(--bg-chat-user);
}

#reader-pal .message:not(:last-child) {
    border-bottom: 1px solid var(--border-light);
}

@keyframes typing {
    0% {
        opacity: 0;
    }
}

#reader-pal .message p.typing::after {
    content: "_";
    display: inline-block;
    animation: typing 0.5s steps(2) infinite;
}

#reader-pal #conv {
    flex: 1;
    overflow: auto;
}

#toc {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
        Arial, sans-serif;
    max-width: 300px;
    margin: 20px auto;
    padding: 10px 5px;
    background-color: var(--bg-toc);
    border-radius: 8px;
    box-shadow: var(--shadow-medium);
}

#toc li {
    list-style: none;
    margin-bottom: 5px;
    transition: all 0.2s ease;
}

#toc a {
    color: var(--text-dark);
    display: block;
    padding: 12px 15px;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

#toc a:hover,
li.active a {
    background-color: var(--bg-hover);
    border-left: 3px solid var(--border-active);
    padding-left: 18px;
}

#toc a.active,
li.active a {
    font-weight: bold;
    color: var(--text-active);
    background-color: var(--bg-active);
    border-left: 3px solid var(--border-active);
}

#viewer {
    aspect-ratio: 3 / 4;
    background-color: var(--bg-viewer) !important;
    width: 90%;
    height: 100vh;
}

#toc-wrapper {
    overflow: hidden;
    flex: 0.5;
    height: 100vh;
    overflow-y: auto;
}

#header {
    padding: 10px;
    gap: 5px;
    background-color: var(--bg-toc);
    border-radius: 8px;
    box-shadow: var(--shadow-medium);
}

#title {
    border-bottom: 1px solid var(--border-light);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-title);
    margin: 0 0 0.8rem 0;
    letter-spacing: -0.5px;
    line-height: 1.3;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    width: 100%;
}

#author {
    display: flex;
    justify-content: flex-end;
    font-size: 0.8rem;
    color: var(--text-author);
    font-style: italic;
    margin: 0;
    letter-spacing: 0.3px;
    width: 100%;
}

book-shelf,
#settings-page {
    color: var(--text-light);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    background: var(--bg-main-transparent);
    backdrop-filter: var(--blur-effect);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-medium);

    /* 初始状态：显示在屏幕内（无位移） */
    transform: translateX(0);
    /* 过渡效果：仅对 transform 做动画，0.3秒缓入缓出 */
    transition: transform 0.5s ease-in-out;
}
/*
.hidden {
    display: none !important;
} */
/* 隐藏时的样式 */
book-shelf.hidden,
#settings-page.hidden {
    /* 向左移动自身宽度的 100%（完全移出屏幕左侧） */
    transform: translateX(-100%);
    transition: transform 0.5s ease-in-out;
}
#menus {
    width: 100%;
    padding: 10px;
    position: relative;
}
#toc-panel-toggle {
    position: absolute;
    top: 5px;
    right: 2rem;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
    box-sizing: border-box;
    padding: 5px 10px;
}
#toc-panel-toggle:hover{
    color: var(--text-active);
}
#menus button {
    flex: 1 1 auto;
    min-width: 80px;
    padding: 8px;
    white-space: nowrap;
}

.theme-switcher {
    color: var(--text-light);
    padding: 6px 12px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-switcher select {
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-light);
    font-size: 14px;
}
.container {
    max-width: 60%;
    min-width: 600px;
}
.pure-button-group .pure-button:first-child {
    border-top-left-radius: 2px;
    border-bottom-left-radius: 2px;
}
.pure-button-group .pure-button {
    margin: 0;
    border-radius: 0;
    border-top-left-radius: 0px;
    border-bottom-left-radius: 0px;
    border-right: 1px solid rgba(0, 0, 0, 0.2);
    letter-spacing: normal;
    word-spacing: normal;
    vertical-align: top;
    text-rendering: auto;
}
.pure-button-hover,
.pure-button:focus,
.pure-button:hover {
    background-image: linear-gradient(
        transparent,
        rgba(0, 0, 0, 0.05) 40%,
        rgba(0, 0, 0, 0.1)
    );
}

.pure-button {
    font-family: inherit;
    font-size: 100%;
    padding: 0.5em 1em;
    color: rgba(0, 0, 0, 0.8);
    border: none transparent;
    border-right-width: medium;
    border-right-style: none;
    border-right-color: transparent;
    background-color: #e6e6e6;
    text-decoration: none;
    border-radius: 2px;
    display: inline-block;
    line-height: normal;
    white-space: nowrap;
    vertical-align: middle;
    text-align: center;
    cursor: pointer;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    user-select: none;
    box-sizing: border-box;
}

ai-sidebar,
stream-output {
    color: var(--text-light);
}

g[class="highlight"] {
    stroke: #000066;
    fill: #00cc00;
}

g[class="underline"] rect {
    visibility:hidden;
    /* fill: rgba(255, 255, 0, 0.3); /* 示例：浅黄半透明 */ */
}

g[class="underline"] line {
    /* 下划线颜色（可根据需求调整，如深灰#333） */
    stroke: red;
    /* 线宽（1-2px较常见） */
    stroke-width: 2;
    /* 线端形状（square为方形，round为圆角） */
    stroke-linecap: square;
    /* 不透明度（1为完全不透明） */
    stroke-opacity: 1;
}

css-tabs{
    max-width: 600px;
}
#toc-wrapper.hidden{
    flex: unset;
}
#toc-wrapper.hidden #menus,
#toc-wrapper.hidden #header,
#toc-wrapper.hidden #toc {
    display:none !important;
}
#toc-wrapper.hidden .holder{
    display: flex;
}

#toc-wrapper .holder{
    display: none;
}
.holder{
    height: 100%;
    width: 40px;
    background: var(--bg-toc);
    cursor: pointer;
      justify-content: center;
      align-items: center;
      color: var(--text-author);
      writing-mode: tb-rl;
      gap: 10px;
}
.holder:hover{
    background: var(--bg-active);
}