:root {
    --bg-color: #000000;
    --text-color: #ffffff;
    --text-muted: #a1a1aa;
    --text-muted-dim: rgba(161, 161, 170, 0.45);
    --text-muted-half: rgba(161, 161, 170, 0.6);
    --border-color: #262626;
    --bg-navbar: #000000;
    --bg-accent: rgba(239, 135, 27, 0.16);
    --bg-card: #0b0b0b;
    --bg-editor: #050505;
    --bg-preview: #101010;
    --bg-overlay: rgba(0, 0, 0, 0.45);
    --ring-color: #ef871b;
    --accent-color: #ef871b;
    --panel-shadow: -16px 0 32px rgba(0, 0, 0, 0.45);
    --input-border: #393939;
    --input-hover-border: #ef871b;
    --input-bg: #151515;
    --input-bg-active: #1f1f1f;
    --selection-bg-color: rgba(239, 135, 27, 0.3);
    --jump-highlight-bg: rgb(0, 0, 0);
    --transition-normal: 220ms ease;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.app-main {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    transition: filter var(--transition-normal);
}

.app-container.settings-open .app-main {
    filter: blur(4px);
}

.app-header {
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    background-color: var(--bg-navbar);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-text {
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.025em;
    user-select: none;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    text-decoration: none;
}

.header__logo-svg {
    width: 0;
    height: 24px;
    margin-right: 0;
    opacity: 0;
    transition: width 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                margin-right 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                opacity 0.4s ease;
}

.logo-text:hover .header__logo-svg {
    width: 28px;
    margin-right: 6px;
    opacity: 1;
}

.header__logo-rect {
    transform-origin: center;
    opacity: 0;
    transform: rotate(-90deg) scale(0);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                opacity 0.4s ease;
}

.header__logo-rect--top {
    transition-delay: 0s;
}

.header__logo-rect--middle {
    transition-delay: 0.1s;
}

.header__logo-rect--bottom-left,
.header__logo-rect--bottom-right {
    transition-delay: 0.2s;
}

.logo-text:hover .header__logo-rect {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.logo-text:hover .header__logo-rect--top {
    transition-delay: 0.2s;
}

.logo-text:hover .header__logo-rect--middle {
    transition-delay: 0.1s;
}

.logo-text:hover .header__logo-rect--bottom-left,
.logo-text:hover .header__logo-rect--bottom-right {
    transition-delay: 0s;
}

.file-path {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-left: 0.25rem;
    max-width: min(40vw, 30rem);
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

@media (min-width: 640px) {
    .file-path {
        display: inline;
    }
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    height: 2.5rem;
    width: 2.5rem;
    color: var(--text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.icon-btn:hover {
    background-color: var(--bg-accent);
    color: var(--accent-color);
}

.icon-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--ring-color);
}

.icon-btn:disabled {
    pointer-events: none;
    opacity: 0.5;
}

.icon-btn svg, .icon-btn img {
    pointer-events: none;
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.markdown-content {
    flex: 1;
    display: flex;
    min-height: 0;
}

.markdown-source {
    width: 50%;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.markdown-source-title,
.markdown-preview-title {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: monospace;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.line-count {
    margin-left: auto;
    color: var(--text-muted-half);
    font-size: 0.75rem;
    font-family: monospace;
}

.markdown-source-content {
    flex: 1;
    min-height: 0;
    overflow: auto;
}

.editor-container {
    display: flex;
    height: 100%;
    background-color: var(--bg-editor);
    position: relative;
}

.line-numbers {
    user-select: none;
    color: var(--text-muted-dim);
    text-align: right;
    padding-right: 0.75rem;
    padding-left: 0.75rem;
    padding-top: 1rem;
    font-family: monospace;
    overflow: hidden;
    flex-shrink: 0;
    font-size: 14px;
    line-height: 1.6;
}

.line-numbers-inner {
    transition: transform 0ms linear;
}

.editor-textarea {
    flex: 1;
    padding: 1rem;
    color: var(--text-color);
    caret-color: #ef871b;
    font-family: monospace;
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    resize: none;
    outline: none;
    font-size: 14px;
    line-height: 1.6;
    box-sizing: border-box;
}

.editor-textarea::selection {
    background: var(--selection-bg-color);
    color: #ffffff;
}

.editor-textarea::-moz-selection {
    background: var(--selection-bg-color);
    color: #ffffff;
}

.markdown-preview {
    width: 50%;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.markdown-preview-content {
    overflow: auto;
    flex: 1;
    background-color: var(--bg-preview);
}

#markdown-preview {
    padding: 1rem 2rem;
    min-height: calc(100% - 2rem);
}

#markdown-preview.theme-dark {
    background-color: #0f0f10;
}

#markdown-preview .bi-direction-jump__target {
    transition: background-color var(--transition-normal), border-radius var(--transition-normal);
}

#markdown-preview .bi-direction-jump__target--active,
#markdown-preview .bi-direction-jump__target--hover {
    background-color: var(--jump-highlight-bg);
    border-radius: 0.3rem;
}

#markdown-preview .bi-direction-jump__target--active {
    border-left: 3px solid var(--accent-color);
    margin-left: -12px;
    padding-left: 10px;
}

#markdown-preview [data-line] {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.setting-backdrop {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
    z-index: 39;
}

.app-container.settings-open .setting-backdrop {
    opacity: 1;
    pointer-events: auto;
}

.setting-panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: min(22rem, 92vw);
    background-color: var(--bg-card);
    border-left: 1px solid var(--border-color);
    z-index: 40;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    box-shadow: var(--panel-shadow);
    display: flex;
    flex-direction: column;
}

.setting-panel.open {
    transform: translateX(0);
}

.setting-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.close-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: background-color 0.2s, color 0.2s;
}

.close-btn:hover {
    background-color: var(--bg-accent);
    color: var(--accent-color);
    border-radius: 0.375rem;
}

.close-btn svg {
    width: 1rem;
    height: 1rem;
    pointer-events: none;
}

.setting-panel-content {
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 0.65rem;
    padding: 0.8rem 0.85rem;
    background-color: rgba(255, 255, 255, 0.01);
    transition: border-color var(--transition-normal), background-color var(--transition-normal), transform var(--transition-normal);
}

.setting-item:hover {
    border-color: var(--input-hover-border);
    background-color: rgba(239, 135, 27, 0.07);
    transform: translateX(-2px);
}

.setting-item input[type="checkbox"] {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--accent-color);
    cursor: pointer;
    transition: transform var(--transition-normal);
}

.setting-item input[type="checkbox"]:active {
    transform: scale(0.92);
}

.setting-item-range {
    display: block;
}

.setting-item-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.65rem;
}

#toc-level-slider {
    width: 100%;
    accent-color: var(--accent-color);
    cursor: pointer;
}

.setting-item-select {
    gap: 0.9rem;
}

#language-select {
    border: 1px solid var(--input-border);
    border-radius: 0.5rem;
    padding: 0.4rem 0.6rem;
    background: var(--input-bg);
    color: var(--text-color);
    transition: border-color var(--transition-normal), background-color var(--transition-normal);
}

#language-select:hover {
    border-color: var(--input-hover-border);
    background-color: var(--input-bg-active);
}

#language-select:focus-visible,
#toc-level-slider:focus-visible,
.setting-item input[type="checkbox"]:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px rgba(239, 135, 27, 0.26);
    border-radius: 0.4rem;
}

.setting-panel-footer {
    margin-top: 2rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.setting-panel-footer-title {
    color: var(--text-color);
    margin-bottom: 0.45rem;
}

@media (max-width: 960px) {
    .markdown-content {
        flex-direction: column;
    }

    .markdown-source,
    .markdown-preview {
        width: 100%;
        min-height: 0;
    }

    .markdown-source {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

/* 修复 Markdown 渲染器中徽章（Badges）和状态图标被强制拉伸的问题 */
.somarkdown-container img[src*="shields.io"],
.somarkdown-container img[src*="badge"],
.somarkdown-container img[src*="badgen.net"],
.somarkdown-container img[src*="travis-ci.org"],
.somarkdown-container img[src*="coveralls.io"] {
    width: auto !important;
    max-width: 100% !important;
    height: auto !important;
    display: inline-block !important;
    box-shadow: none !important; /* 移除徽章可能带有的阴影 */
}