body {
    margin: 0;
    font-family: 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    background: #f7f7f7;
    color: #222;
}
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2vw;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    position: sticky;
    top: 0;
    z-index: 10;
}
header h1 {
    font-size: 1.5rem;
    margin: 0;
}
header button {
    margin-left: 1rem;
    padding: 0.5em 1.2em;
    border: none;
    background: #4e8cff;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}
header button:hover {
    background: #2563c9;
}
main {
    display: flex;
    min-height: 80vh;
    max-width: 1200px;
    margin: 2rem auto 0 auto;
    gap: 2vw;
}
.home-link {
    position: fixed;
    left: 16px;
    bottom: 16px;
    top: auto;
    right: auto;
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    font-size: 15px;
    z-index: 1000;
    transition: all 0.3s ease;
    background: rgba(138, 43, 226, 0.8);
    padding: 7px 13px;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    font-weight: 500;
    max-width: 90vw;
    min-width: 0;
    pointer-events: auto;
    white-space: nowrap;
}

.home-link img {
    width: 22px;
    height: 22px;
    margin-right: 7px;
}

.home-link:hover {
    background: rgba(106, 28, 185, 0.9);
    transform: translateY(-2px) scale(0.98);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* 调整容器位置，避免按钮遮挡 */
.container {
    padding-top: 70px; /* 新增顶部间距 */
}

#chapter-menu {
    min-width: 200px;
    max-width: 260px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 1.2rem 0.7rem;
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.2rem;
    align-content: flex-start;
    height: 100vh;
    max-height: 100vh;
    overflow-y: auto;
    border: 1px solid #e3eaf2;
    position: sticky;
    top: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: 0.2rem;
}
#chapter-menu button {
    display: block;
    width: 100%;
    min-height: 2.2em;
    margin: 0.1em 0;
    box-sizing: border-box;
    text-align: left;
    font-size: 1em;
    transition: font-size 0.2s, background 0.2s, color 0.2s, border 0.2s;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    background: linear-gradient(90deg, #eaf1ff 60%, #f7faff 100%);
    color: #2563c9;
    border: 1px solid #c3d6f7;
    border-radius: 6px;
    font-weight: 500;
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    cursor: pointer;
    padding: 0.6em 0.8em;
}
#chapter-menu button[data-len='short'] { font-size: 1.08em; }
#chapter-menu button[data-len='medium'] { font-size: 0.98em; }
#chapter-menu button[data-len='long'] { font-size: 0.88em; }
#chapter-menu button[data-len='xlong'] { font-size: 0.78em; }
#chapter-menu button.active, #chapter-menu button:hover {
    background: linear-gradient(90deg, #4e8cff 60%, #2563c9 100%);
    color: #fff;
    border: 1px solid #4e8cff;
}
#chapter-menu button.bookmarked {
    background: linear-gradient(90deg, #ffe9b3 60%, #fff7e0 100%);
    color: #b97a00;
    border: 1px solid #ffd36b;
    font-weight: bold;
}
#chapter-menu button.bookmarked.active, #chapter-menu button.bookmarked:hover {
    background: linear-gradient(90deg, #ffb300 60%, #ff9800 100%);
    color: #fff;
    border: 1px solid #ffb300;
}
#reader-section {
    flex: 1 1 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    padding: 2rem 1.5rem 1.5rem 1.5rem;
    min-width: 0;
    display: flex;
    flex-direction: column;
    min-height: 60vh;
    transition: background 0.2s;
}
.dark-mode #reader-section,
.dark-mode #chapter-content {
    background: #23272e !important;
    color: #e0e0e0;
}
#loading {
    font-size: 1.2rem;
    color: #4e8cff;
    text-align: center;
    margin: 2rem 0;
}
#chapter-title {
    font-size: 1.6rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    text-align: center;
    color: #2563c9;
    letter-spacing: 0.05em;
    text-shadow: 0 2px 8px rgba(78,140,255,0.08);
}
#chapter-content {
    font-size: 1.15rem;
    line-height: 2.2;
    margin-bottom: 2rem;
    word-break: break-all;
    min-height: 40vh;
    max-height: 60vh;
    overflow-y: auto;
    padding: 1.2em 0.5em 1.2em 0.5em;
    background: #f7faff;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(78,140,255,0.04);
    border: 1px solid #e3eaf2;
    transition: background 0.2s;
}
#reader-controls {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    margin-bottom: 0.5rem;
}
#reader-controls button {
    padding: 0.6em 1.3em;
    border: none;
    background: linear-gradient(90deg, #eaf1ff 60%, #f7faff 100%);
    color: #2563c9;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 500;
    border: 1px solid #c3d6f7;
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    transition: background 0.2s, color 0.2s, border 0.2s;
}
#reader-controls button:hover, #reader-controls button.active {
    background: linear-gradient(90deg, #4e8cff 60%, #2563c9 100%);
    color: #fff;
    border: 1px solid #4e8cff;
}
#settings-modal {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.12);
    padding: 2rem 2.5rem;
    z-index: 100;
    min-width: 260px;
}
#settings-modal label {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 1rem;
    gap: 0.5em;
}
#settings-modal input[type="text"] {
    flex: 1 1 auto;
    min-width: 0;
    margin-right: 0.5em;
}
#settings-modal input[type="checkbox"] {
    margin-left: 0.2em;
    margin-right: 0.2em;
    width: 1.1em;
    height: 1.1em;
}
#settings-modal input {
    width: 100%;
    padding: 0.5em;
    font-size: 1rem;
    margin-top: 0.5em;
    border: 1px solid #ddd;
    border-radius: 4px;
}
#settings-modal button {
    margin-right: 1rem;
    padding: 0.5em 1.2em;
    border: none;
    background: #4e8cff;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}
#settings-modal button:last-child {
    margin-right: 0;
    background: #aaa;
}
@media (max-width: 1200px) {
    #chapter-menu {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 900px) {
    main {
        flex-direction: column;
        gap: 1rem;
    }
    .home-link {
        font-size: 13px;
        padding: 5px 10px;
        left: 8px;
        bottom: 8px;
        max-width: 95vw;
    }

    .home-link img {
        width: 18px;
        height: 18px;
    }

    .container {
        padding-top: 60px; /* 移动端减少间距 */
    }
    #chapter-menu {
        min-width: 0;
        max-width: 100vw;
        width: 100%;
        height: 30vh;
        max-height: 30vh;
        position: static;
        padding: 0.7rem 0.2rem;
    }
    #reader-section {
        padding: 1.2rem 0.5rem 1rem 0.5rem;
    }
    #chapter-title {
        font-size: 1.15rem;
    }
    #chapter-content {
        font-size: 1.02rem;
        max-height: 50vh;
        padding: 0.7em 0.2em 0.7em 0.2em;
    }
    #reader-controls button {
        font-size: 0.98rem;
        padding: 0.5em 0.8em;
    }
}
@media (max-width: 600px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
        padding: 0.7rem 2vw;
    }
    main {
        margin: 0.5rem;
    }
    #chapter-title {
        font-size: 1rem;
    }
    #chapter-content {
        font-size: 0.95rem;
        max-height: 38vh;
        padding: 0.5em 0.1em 0.5em 0.1em;
    }
    #chapter-menu button {
        font-size: 0.92em;
        min-width: 54px;
        max-width: 80px;
        padding: 0.4em 0.3em;
    }
    #settings-modal {
        padding: 0.7rem 0.2rem;
        min-width: 120px;
        font-size: 0.95rem;
    }
    #reader-controls {
        gap: 0.5rem;
    }
    #reader-controls button {
        font-size: 0.92rem;
        padding: 0.4em 0.7em;
    }
    #chapter-menu {
        grid-template-columns: repeat(1, 1fr);
        height: 22vh;
        max-height: 22vh;
        position: static;
        padding: 0.5rem 0.1rem;
    }
    .home-link {
        font-size: 11px;
        padding: 3px 7px;
        left: 4px;
        bottom: 4px;
        max-width: 98vw;
    }
    .home-link img {
        width: 15px;
        height: 15px;
    }
}
@media (max-width: 400px) {
    .home-link {
        padding: 2px 2px;
        font-size: 0;
        left: 2px;
        bottom: 2px;
    }
    .home-link img {
        width: 18px;
        height: 18px;
        margin-right: 0;
    }
    .home-link span {
        display: none;
    }
}
.dark-mode {
    background: #23272e;
    color: #e0e0e0;
}
.dark-mode #reader-section,
.dark-mode #chapter-menu,
.dark-mode #settings-modal {
    background: #2d323b;
    color: #e0e0e0;
}
.dark-mode header {
    background: #23272e;
    color: #e0e0e0;
}
.dark-mode #chapter-menu button {
    background: #3a4252;
    color: #b3c7ff;
}
.dark-mode #chapter-menu button.active, .dark-mode #chapter-menu button:hover {
    background: #4e8cff;
    color: #fff;
}
.dark-mode #reader-controls button {
    background: #3a4252;
    color: #b3c7ff;
}
.dark-mode #reader-controls button.active, .dark-mode #reader-controls button:hover {
    background: #4e8cff;
    color: #fff;
}
/* 拖拽分栏样式 */
#container {
    display: flex;
    width: 100%;
    height: 100%;
}
#chapter-menu {
    resize: horizontal;
    overflow: auto;
    min-width: 120px;
    max-width: 50vw;
}
#dragbar {
    width: 6px;
    cursor: ew-resize;
    background: #e3eaf2;
    transition: background 0.2s;
    z-index: 20;
}
#dragbar:hover {
    background: #4e8cff;
}

/* 目录弹出遮罩层 */
#menu-mask {
    position: fixed;
    left: 0; top: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.18);
    z-index: 99;
    display: none;
}

/* 目录弹窗样式 */
.mobile-menu-active #chapter-menu {
    display: block !important;
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: 70vw; max-width: 340px; min-width: 120px;
    z-index: 100;
    box-shadow: 2px 0 16px rgba(0,0,0,0.12);
    background: #fff;
    border-radius: 0 8px 8px 0;
    height: 100vh !important;
    max-height: 100vh !important;
    overflow-y: auto;
    padding: 1.2rem 0.7rem;
}
.mobile-menu-active #menu-mask {
    display: block !important;
}

/* 隐藏目录栏的class */
.hidden-on-mobile {
    display: block;
}
@media (max-width: 900px), (max-aspect-ratio: 1/1) {
    #chapter-menu.hidden-on-mobile {
        display: none !important;
    }
    #show-menu-btn {
        display: inline-block !important;
    }
}
@media (max-width: 900px), (max-aspect-ratio: 1/1) {
    .mobile-menu-active #chapter-menu {
        display: block !important;
    }
}

/* 优化按钮区，极小屏幕下横向滚动且不换行 */
#reader-controls {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    margin-bottom: 0.5rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
}
#reader-controls button {
    white-space: nowrap;
    min-width: 70px;
}
@media (max-width: 600px) {
    #reader-controls {
        gap: 0.5rem;
        font-size: 0.92rem;
        padding-bottom: 2px;
    }
    #reader-controls button {
        font-size: 0.92rem;
        min-width: 54px;
        padding: 0.4em 0.7em;
    }
}

/* 目录栏与阅读区高度对齐（flex布局） */
#container {
    align-items: stretch;
}
#chapter-menu {
    height: auto;
    max-height: none;
}
@media (min-width: 901px) {
    #container {
        min-height: 60vh;
        height: 100%;
        max-width: 100vw;
        overflow-x: hidden;
    }
    #chapter-menu {
        height: auto;
        max-height: none;
        align-self: stretch;
        max-width: 50vw;
        min-width: 120px;
        width: auto;
    }
    #reader-section {
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        min-width: 0;
        flex: 1 1 0;
        width: 0;
    }
} 

/* dragbar 层级调低，且只在目录可见时显示 */
#dragbar {
    width: 6px;
    cursor: ew-resize;
    background: #e3eaf2;
    transition: background 0.2s;
    z-index: 2; /* 明显低于header */
    display: block;
    height: 100%;
}
@media (max-width: 900px), (max-aspect-ratio: 1/1) {
    #dragbar {
        display: none !important;
    }
}
.mobile-menu-active #dragbar {
    display: none !important;
}

/* container高度自适应，始终fit屏幕 */
#container {
    display: flex;
    width: 100vw;
    height: calc(100vh - 64px); /* header约64px */
    min-height: 0;
    align-items: stretch;
    box-sizing: border-box;
}
@media (max-width: 600px) {
    #container {
        height: calc(100vh - 48px);
    }
}

/* 目录栏高度自适应且可滚动 */
#chapter-menu {
    min-width: 120px;
    max-width: 50vw;
    height: 100%;
    max-height: 100%;
    overflow-y: auto;
    align-self: stretch;
}
.mobile-menu-active #chapter-menu {
    height: 100vh !important;
    max-height: 100vh !important;
}

/* 阅读区和按钮区自适应高度 */
#reader-section {
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    height: 100%;
    box-sizing: border-box;
}
#chapter-content {
    flex: 1 1 auto;
    min-height: 0;
    max-height: none;
    overflow-y: auto;
}
#reader-controls {
    flex-shrink: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    justify-content: center;
    gap: 1.2rem;
    margin-bottom: 0.5rem;
    padding-bottom: 2px;
    min-width: 0;
}
#reader-controls button {
    white-space: nowrap;
    min-width: 70px;
    font-size: 1.05rem;
    transition: font-size 0.2s, transform 0.2s;
}
@media (max-width: 900px) {
    #reader-controls button {
        font-size: 0.92rem;
        min-width: 54px;
        padding: 0.4em 0.7em;
    }
    #reader-controls {
        gap: 0.5rem;
    }
}
@media (max-width: 600px) {
    #reader-controls button {
        font-size: 0.85rem;
        min-width: 44px;
        padding: 0.3em 0.5em;
        transform: scale(0.95);
    }
    #reader-controls {
        gap: 0.3rem;
    }
}
@media (max-width: 400px) {
    #reader-controls button {
        font-size: 0.7rem;
        min-width: 36px;
        padding: 0.2em 0.3em;
        transform: scale(0.85);
    }
} 

@media (max-width: 600px), (max-aspect-ratio: 1/1) {
    header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 0.2rem;
        padding: 0.4rem 1vw;
        height: 38px;
        min-height: 0;
    }
    header h1 {
        font-size: 1.02rem;
        margin: 0 0.2em 0 0;
        flex: 1 1 auto;
        min-width: 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    header button, #show-menu-btn {
        font-size: 0.82rem !important;
        padding: 0.25em 0.7em !important;
        min-width: 0 !important;
        margin-left: 0.1em;
        margin-right: 0.1em;
        height: 28px;
        line-height: 1.1;
        flex: 0 1 auto;
        border-radius: 4px;
        box-sizing: border-box;
    }
    #show-menu-btn {
        display: inline-block !important;
    }
    main {
        margin: 0;
        padding: 0;
    }
    #container {
        height: calc(100vh - 38px);
        min-height: 0;
        width: 100vw;
        box-sizing: border-box;
    }
    .mobile-menu-active #chapter-menu {
        width: 50vw !important;
        min-width: 120px;
        max-width: 100vw;
        height: 100vh !important;
        max-height: 100vh !important;
        left: 0;
        top: 0;
        border-radius: 0 8px 8px 0;
        padding: 0.7rem 0.2rem;
    }
    #chapter-menu {
        padding: 0.7rem 0.2rem;
        min-width: 0;
        max-width: 100vw;
        width: 100%;
        height: 100%;
        max-height: 100%;
        position: static;
        display: grid;
        grid-template-columns: repeat(1, 1fr);
        gap: 0.2rem;
        align-content: flex-start;
        overflow-y: auto;
    }
    #chapter-menu button {
        font-size: 0.92em;
        min-width: 0;
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
        padding: 0.4em 0.3em;
        margin: 0.1em 0;
        border-radius: 4px;
        text-align: left;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    #reader-section {
        padding: 0.7rem 0.2rem 0.5rem 0.2rem;
        min-width: 0;
        min-height: 0;
        height: 100%;
        box-sizing: border-box;
    }
    #chapter-title {
        font-size: 1rem;
    }
    #chapter-content {
        font-size: 0.95rem;
        max-height: none;
        min-height: 0;
        padding: 0.5em 0.1em 0.5em 0.1em;
    }
    #reader-controls {
        gap: 0.2rem;
        font-size: 0.82rem;
        padding-bottom: 2px;
        flex-wrap: nowrap;
        overflow-x: auto;
        min-width: 0;
    }
    #reader-controls button {
        font-size: 0.82rem;
        min-width: 36px;
        padding: 0.2em 0.3em;
        transform: scale(0.85);
    }
} 

@media (min-width: 901px) {
    #reader-controls {
        display: flex;
        flex-wrap: nowrap;
        justify-content: center;
        align-items: center;
        gap: 0;
        width: 100%;
        font-size: 1.05rem;
        padding: 0;
        margin: 0;
        /* 超窄时整体缩放 */
        transition: transform 0.2s;
    }
    #reader-controls button {
        flex: 1 1 0;
        width: 16.66%;
        min-width: 0;
        max-width: 100%;
        font-size: 1.05vw;
        padding: 0.4em 0.2em;
        margin: 0;
        box-sizing: border-box;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        transition: font-size 0.2s, padding 0.2s;
    }
    /* 超窄时整体scale缩小，防止溢出 */
    #reader-section[style*="width: 300px"] ~ #reader-controls,
    #reader-section[style*="width: 250px"] ~ #reader-controls {
        transform: scale(0.85);
    }
    #reader-section[style*="width: 200px"] ~ #reader-controls {
        transform: scale(0.7);
    }
}