/* ============================================================
   style.css — 思酷素材 HTML 编辑神器 统一样式表
   
   重构说明：
   - CSS 变量系统已统一，使用 HTML 内嵌的变量（支持深色/浅色双主题）
   - 优先使用 Tailwind CSS 类，此处仅保留无法通过 Tailwind 替代的样式
   - 内嵌 <style> 已迁移至此文件
   ============================================================ */

/* ============================================================
   1. 字体定义
   ============================================================ */
@font-face {
    font-family: 'f7';
    src: url('../font/f7.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

/* ============================================================
   2. CSS 变量：深色主题（默认）
   ============================================================ */
:root,
[data-theme="dark"] {
    /* --- 布局尺寸 --- */
    --nav-height: 64px;
    --sidebar-width: 300px;
    --sidebar-padding: 18px;
    --scrollbar-size: 5px;

    /* --- 基础色板（与 Tailwind 配置同步） --- */
    --color-canvas: #0A0B0F;
    --color-surface: #14151C;
    --color-elevated: #1E2029;
    --color-line: #2A2D38;
    --color-line-strong: #3A3D4A;
    --color-ink: #F2F4F8;
    --color-ink-soft: #9AA0AE;
    --color-ink-faint: #5C6170;
    --color-primary: #5B6BFF;
    --color-primary-hover: #7886FF;
    --color-success: #2BE08C;
    --color-warning: #F5D547;
    --color-info: #3DD7E5;
    --color-danger: #FF3A5C;

    /* RGB 通道（用于透明度混合场景） */
    --color-canvas-rgb: 10 11 15;
    --color-surface-rgb: 20 21 28;
    --color-elevated-rgb: 30 32 41;
    --color-primary-rgb: 91 107 255;

    /* --- 阴影 --- */
    --shadow-drawer: 8px 8px 40px rgba(0, 0, 0, 0.6);

    /* --- 主题切换按钮 --- */
    --toggle-bg: #1E2029;
    --toggle-border: #2A2D38;

    /* --- 间距 --- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 14px;
    --radius-card: 16px;
    --radius-tile: 12px;
    --radius-pill: 999px;

    /* --- 组件专用变量（向后兼容旧 CSS） --- */
    --accent: var(--color-primary);
    --accent-hover: var(--color-primary-hover);
    --accent-soft: rgba(91, 107, 255, 0.12);
    --blue: var(--color-primary);
    --pink: var(--color-danger);
    --text: var(--color-ink);
    --muted: var(--color-ink-soft);
    --line: var(--color-line);
    --page-bg: var(--color-canvas);
    --topbar-bg: rgba(10, 11, 15, 0.88);
    --tool-color: var(--color-ink-soft);
    --tool-hover-color: var(--color-primary-hover);
    --tool-disabled: #66708d;
    --tooltip-bg: rgba(30, 32, 41, 0.94);
    --tooltip-text: var(--color-ink);
    --tooltip-border: rgba(91, 107, 255, 0.28);
    --on-accent: #ffffff;
    --tool-active-bg: linear-gradient(135deg, #5B6BFF, #7B61FF);
    --tool-active-shadow: 0 12px 30px rgba(91, 107, 255, 0.25);
    --nav-link-bg: rgba(30, 32, 41, 0.68);
    --nav-link-hover: rgba(91, 107, 255, 0.16);
    --theme-toggle-shadow: 0 10px 24px rgba(0, 0, 0, 0.14);
    --home-bg: var(--color-canvas);
    --import-bg: rgba(30, 32, 41, 0.82);
    --import-bg-hover: rgba(30, 32, 41, 0.96);
    --import-border: rgba(91, 107, 255, 0.42);
    --import-text: var(--color-primary-hover);
    --shadow: 0 28px 80px rgba(91, 107, 255, 0.18);
    --workspace-bg: var(--color-canvas);
    --preview-bg: #ffffff;
    --edit-outline: rgba(91, 107, 255, 0.36);
    --frame-focus: rgba(91, 107, 255, 0.78);
    --modal-overlay: rgba(2, 6, 22, 0.66);
    --modal-bg: #1E2029;
    --modal-text: var(--color-ink);
    --modal-muted: var(--color-ink-soft);
    --modal-shadow: 0 28px 70px rgba(0, 0, 0, 0.48);
    --modal-close: var(--color-ink-soft);
    --modal-close-hover-bg: rgba(255, 255, 255, 0.08);
    --kbd-bg: rgba(255, 255, 255, 0.08);
    --kbd-border: rgba(186, 205, 255, 0.25);
    --modal-btn-bg: #3468ff;
    --modal-btn-hover: #2655dc;
    --modal-secondary-bg: rgba(255, 255, 255, 0.1);
    --modal-secondary-hover: rgba(255, 255, 255, 0.16);
    --modal-secondary-text: #d7e3ff;
}

/* ============================================================
   3. CSS 变量：浅色主题 (Apple 风格)
   ============================================================ */
[data-theme="light"] {
    --color-canvas: #F5F5F7;
    --color-surface: #FFFFFF;
    --color-elevated: #F0F0F2;
    --color-line: #E5E5EA;
    --color-line-strong: #D1D1D6;
    --color-ink: #1D1D1F;
    --color-ink-soft: #6E6E73;
    --color-ink-faint: #AEAEB2;
    --color-primary: #007AFF;
    --color-primary-hover: #3395FF;
    --color-success: #34C759;
    --color-warning: #FF9500;
    --color-info: #5AC8FA;
    --color-danger: #FF3B30;

    --color-canvas-rgb: 245 245 247;
    --color-surface-rgb: 255 255 255;
    --color-elevated-rgb: 240 240 242;
    --color-primary-rgb: 0 122 255;

    --shadow-drawer: 0 4px 24px rgba(0, 0, 0, 0.08);

    --toggle-bg: #F0F0F2;
    --toggle-border: #E5E5EA;

    /* 组件专用变量（向后兼容） */
    --accent: var(--color-primary);
    --accent-hover: var(--color-primary-hover);
    --accent-soft: rgba(0, 122, 255, 0.12);
    --blue: var(--color-primary);
    --pink: var(--color-danger);
    --text: var(--color-ink);
    --muted: var(--color-ink-soft);
    --line: var(--color-line);
    --page-bg: var(--color-canvas);
    --topbar-bg: rgba(255, 255, 255, 0.96);
    --tool-color: #747474;
    --tool-hover-color: var(--color-primary);
    --tooltip-bg: rgba(255, 255, 255, 0.98);
    --tooltip-text: #273043;
    --tooltip-border: rgba(0, 122, 255, 0.16);
    --on-accent: #ffffff;
    --tool-active-bg: var(--color-primary);
    --tool-active-shadow: 0 10px 24px rgba(0, 122, 255, 0.25);
    --nav-link-bg: #ffffff;
    --nav-link-hover: rgba(0, 122, 255, 0.1);
    --home-bg: var(--color-canvas);
    --import-bg: rgba(255, 255, 255, 0.96);
    --import-bg-hover: #ffffff;
    --import-border: rgba(0, 122, 255, 0.24);
    --import-text: var(--color-primary);
    --shadow: 0 28px 80px rgba(0, 122, 255, 0.18);
    --workspace-bg: var(--color-canvas);
    --preview-bg: #ffffff;
    --edit-outline: rgba(0, 122, 255, 0.35);
    --frame-focus: rgba(0, 122, 255, 0.75);
    --modal-overlay: rgba(0, 0, 0, 0.5);
    --modal-bg: #ffffff;
    --modal-text: var(--color-ink);
    --modal-muted: #5f6670;
    --modal-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
    --modal-close: #8b919d;
    --modal-close-hover-bg: #f4f6f8;
    --kbd-bg: #ffffff;
    --kbd-border: #d1d5db;
    --modal-btn-bg: #2563eb;
    --modal-btn-hover: #1d4ed8;
    --modal-secondary-bg: #edf1f5;
    --modal-secondary-hover: #e1e7ee;
    --modal-secondary-text: #3f4652;
}

/* ============================================================
   4. 全局盒模型 & 滚动条
   ============================================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* 滚动条：Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--accent-soft);
}

/* 滚动条：WebKit */
*::-webkit-scrollbar {
    width: var(--scrollbar-size);
    height: var(--scrollbar-size);
}

*::-webkit-scrollbar-track {
    background: var(--accent-soft);
}

*::-webkit-scrollbar-thumb {
    border-radius: var(--radius-pill);
    background: var(--color-primary);
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-hover);
}

/* ============================================================
   5. 页面主体背景 & 基础样式
   ============================================================ */
html,
body {
    width: 100%;
    min-height: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--color-ink);
    background: var(--color-canvas);
    transition: background 0.32s ease, color 0.32s ease;
}

body {
    background:
        radial-gradient(1200px 700px at 80% -10%, rgba(91, 107, 255, 0.10), transparent 60%),
        radial-gradient(900px 600px at -10% 30%, rgba(61, 215, 229, 0.06), transparent 60%),
        var(--color-canvas);
    transition: background 0.5s ease;
}

[data-theme="light"] body {
    background:
        radial-gradient(1200px 700px at 80% -10%, rgba(0, 122, 255, 0.05), transparent 60%),
        radial-gradient(900px 600px at -10% 30%, rgba(90, 200, 250, 0.04), transparent 60%),
        var(--color-canvas);
}

/* 禁止页面级滚动（避免无意义的右侧滚动条） */
html,
body {
    overflow: hidden !important;
    height: 100vh !important;
}

main {
    overflow: hidden;
    height: calc(100vh - var(--nav-height));
    padding-left: var(--sidebar-width);
}

h1,
h2,
h3 {
    font-family: "Noto Serif SC", ui-serif, Georgia, serif !important;
    font-weight: 700 !important;
}

/* 文本选区色 */
::selection {
    background-color: rgb(var(--color-primary-rgb) / 0.12);
    color: var(--color-ink);
}

button,
input,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

a {
    text-decoration: none;
}

/* ============================================================
   6. 顶部 Header 半透明毛玻璃背景
   ============================================================ */
header {
    background-color: rgb(var(--color-canvas-rgb) / 0.72);
}

/* ============================================================
   7. 桌面端侧边栏
   ============================================================ */
aside.page-nav {
    width: var(--sidebar-width);
    background-color: rgb(var(--color-canvas-rgb) / 0.82);
}

/* 侧边栏滚动条样式 */
aside.page-nav>div {
    scrollbar-width: thin;
    scrollbar-color: var(--color-line-strong) transparent;
}

aside.page-nav>div::-webkit-scrollbar {
    width: 5px;
}

aside.page-nav>div::-webkit-scrollbar-track {
    background: transparent;
}

aside.page-nav>div::-webkit-scrollbar-thumb {
    background: var(--color-line-strong);
    border-radius: 999px;
}

aside.page-nav>div::-webkit-scrollbar-thumb:hover {
    background: var(--color-ink-faint);
}

/* ============================================================
   8. 主题切换按钮
   ============================================================ */
#themeToggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--toggle-border);
    background: var(--toggle-bg);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    outline: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: background 0.5s ease, border-color 0.5s ease, box-shadow 0.2s ease;
}

#themeToggle:hover {
    box-shadow: 0 0 0 3px rgb(var(--color-primary-rgb) / 0.15);
}

#themeToggle:active {
    transform: scale(0.92);
    transition: transform 0.15s ease;
}

#themeToggle .icon-spin {
    display: inline-block;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
    backface-visibility: hidden;
}

#themeToggle.spin .icon-spin,
#themeToggle .icon-spin.is-rotating {
    transform: rotate(360deg);
}

/* ============================================================
   9. 全局颜色过渡
   ============================================================ */
*,
*::before,
*::after {
    transition: background-color 0.45s ease,
        color 0.45s ease,
        border-color 0.45s ease,
        box-shadow 0.45s ease,
        background 0.45s ease;
}

/* 排除不需要过渡的元素 */
#themeToggle .icon-spin {
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   10. 导航链接 & 工具按钮
   ============================================================ */
.nav-link,
.tool-btn {
    border: 0;
    background: transparent;
    text-decoration: none;
    color: var(--tool-color);
    line-height: 1;
    white-space: nowrap;
    transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.tool-btn {
    display: inline-flex;
    position: relative;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 8px 12px;
    border-radius: var(--radius-pill);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0;
}

.tool-btn:hover {
    color: var(--tool-hover-color);
    transform: translateY(-1px);
}

.tool-btn:disabled {
    color: var(--tool-disabled);
    cursor: not-allowed;
    opacity: 0.62;
    transform: none;
}

.tool-btn.active {
    color: var(--on-accent);
    background: var(--tool-active-bg);
    box-shadow: var(--tool-active-shadow);
    transform: translateY(-1px);
}

.tool-btn svg,
.nav-link svg {
    width: 1em;
    height: 1em;
    vertical-align: -0.125em;
}

body.text-editing .preview-shell {
    outline: 3px solid var(--edit-outline);
    outline-offset: -3px;
}

.nav-link {
    min-height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 6px 10px;
    border: 1px solid var(--blue);
    border-radius: var(--radius-sm);
    background: var(--nav-link-bg);
    font-size: 12px;
}

.nav-link:hover {
    color: var(--blue);
    background: var(--nav-link-hover);
    transform: translateY(-1px);
}

/* ============================================================
   11. 主页视图 & 导入按钮
   ============================================================ */
.home-view {
    min-height: calc(100vh - var(--nav-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: var(--home-bg);
    position: relative;
    isolation: isolate;
    transition: background 0.32s ease;
}

.import-panel {
    position: relative;
    z-index: 1;
    width: min(560px, 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* 导入按钮：深色主题 */

.import-btn {
    align-items: center;
    background-image: linear-gradient(90deg, rgb(226, 64, 255), rgb(91, 66, 243) 50%, rgb(0, 221, 235));
    border: 0px;
    border-radius: 12px;
    box-sizing: border-box;
    color: rgb(255, 255, 255);
    display: flex;
    justify-content: center;
    max-width: 100%;
    min-width: 100px;
    padding: 4px;
    cursor: pointer;
    transition: 0.3s;
    font-size: clamp(22px, 4.8vw, 31px);
    padding: 12px 24px;
    font-weight: 700;
}

.import-btn:hover {
    outline: 0px;
    transform: scale(1.1);
}

/* 文件输入（隐藏） */
.file-input {
    position: fixed;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

/* ============================================================
   12. 工作区 & 预览框架
   ============================================================ */
.workspace {
    display: none;
    min-height: calc(100vh - var(--nav-height));
    background: var(--workspace-bg);
}

body.editor-ready .home-view {
    display: none;
}

body.editor-ready .workspace {
    display: block;
}

.preview-shell {
    width: 100%;
    height: calc(100vh - var(--nav-height));
    background: var(--preview-bg);
}

.preview-frame {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
    background: var(--preview-bg);
}

/* ============================================================
   13. 侧边栏组件样式
   ============================================================ */
.style-group {
    display: grid;
    gap: 12px;
    margin-bottom: 28px;
}

.style-group:last-child {
    margin-bottom: 0;
}

.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.tool-grid .tool-btn {
    width: 100%;
    justify-content: flex-start;
    gap: 8px;
    padding: 12px 14px;
    font-size: 15px;
    border-radius: var(--radius-md);
    background: var(--nav-link-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tool-grid .tool-btn.active {
    color: var(--on-accent);
    background: var(--tool-active-bg);
    box-shadow: var(--tool-active-shadow);
}

.style-title {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    color: var(--text);
    font-size: 17px;
    font-weight: 700;
    line-height: 1.3;
}

.style-select-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.style-select-icon {
    position: absolute;
    left: 14px;
    z-index: 1;
    pointer-events: none;
    font-size: 16px;
    line-height: 1;
}

.style-select {
    width: 100%;
    height: 44px;
    padding: 0 38px 0 44px;
    border: 1px solid var(--line);
    border-radius: 11px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--nav-link-bg);
    color: var(--text);
    font-size: 15px;
    line-height: 44px;
    outline: none;
}

.style-select-wrap::after {
    content: "";
    position: absolute;
    right: 15px;
    width: 11px;
    height: 11px;
    border-right: 2px solid var(--muted);
    border-bottom: 2px solid var(--muted);
    pointer-events: none;
    transform: translateY(-3px) rotate(45deg);
}

.style-select:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.18);
}

/* ============================================================
   14. 对齐控件 & 行高滑块
   ============================================================ */
.align-control {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 12px;
}

.align-label {
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    white-space: nowrap;
}

.align-btns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    padding: 6px;
    border-radius: var(--radius-lg);
    background: var(--accent-soft);
}

.align-btn {
    min-width: 0;
    min-height: 34px;
    border: 0;
    border-radius: 11px;
    background: transparent;
    color: var(--modal-muted);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.2;
    transition: color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.align-btn:hover,
.align-btn:focus-visible {
    outline: none;
    color: var(--blue);
    background: rgba(255, 255, 255, 0.1);
}

.align-btn.active {
    color: var(--pink);
    background: var(--modal-bg);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.14);
}

.font-weight-control {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 12px;
}

.font-weight-label {
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    white-space: nowrap;
}

.font-weight-btns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    padding: 6px;
    border-radius: var(--radius-lg);
    background: var(--accent-soft);
}

.font-weight-btn {
    min-width: 0;
    min-height: 34px;
    border: 0;
    border-radius: 11px;
    background: transparent;
    color: var(--modal-muted);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.2;
    transition: color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.font-weight-btn:hover,
.font-weight-btn:focus-visible {
    outline: none;
    color: var(--blue);
    background: rgba(255, 255, 255, 0.1);
}

.font-weight-btn.active {
    color: var(--pink);
    background: var(--modal-bg);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.14);
}

.line-height-control {
    display: grid;
    grid-template-columns: auto 1fr 54px;
    align-items: center;
    gap: 10px;
}

.line-height-label {
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    white-space: nowrap;
}

.line-height-slider {
    width: 100%;
    height: 6px;
    appearance: none;
    -webkit-appearance: none;
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    outline: none;
}

.line-height-slider::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
    appearance: none;
    -webkit-appearance: none;
    border: 0;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(91, 107, 255, 0.16);
}

.line-height-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border: 0;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(91, 107, 255, 0.16);
}

.line-height-value {
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 14px;
    font-weight: 800;
}

/* ============================================================
   15. 颜色选择器 & Emoji 面板
   ============================================================ */
.color-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 7px;
}

.color-swatch {
    width: 100%;
    aspect-ratio: 1 / 1;
    border: 1px solid rgba(16, 38, 68, 0.08);
    border-radius: var(--radius-sm);
    background: var(--swatch-color);
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.color-swatch:hover,
.color-swatch:focus-visible {
    outline: none;
    transform: translateY(-2px);
}

.emoji-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.emoji-tab {
    min-height: 28px;
    padding: 5px 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--nav-link-bg);
    color: var(--text);
    font-size: 12px;
    line-height: 1;
}

.emoji-tab.active {
    border-color: var(--blue);
    background: var(--tool-active-bg);
    color: var(--on-accent);
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(32px, 1fr));
    gap: 6px;
    overflow-x: hidden;
}

.emoji-btn {
    width: 100%;
    aspect-ratio: 1;
    min-width: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--nav-link-bg);
    color: var(--text);
    font-size: 24px;
    line-height: 1;
    transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.emoji-btn:hover,
.emoji-btn:focus-visible {
    outline: none;
    border-color: var(--blue);
    background: var(--nav-link-hover);
    transform: translateY(-1px);
}

/* ============================================================
   16. 模态框
   ============================================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--modal-overlay);
    backdrop-filter: blur(4px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.24s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    position: relative;
    width: min(420px, 100%);
    padding: 30px 32px 28px;
    border-radius: var(--radius-card);
    background: var(--modal-bg);
    color: var(--modal-text);
    box-shadow: var(--modal-shadow);
    transform: translateY(20px) scale(0.96);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.active .modal-card {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 13px;
    right: 13px;
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--modal-close);
    font-size: 19px;
    transition: background 0.2s ease, color 0.2s ease;
}

.modal-close:hover {
    color: var(--modal-text);
    background: var(--modal-close-hover-bg);
}

.modal-title {
    margin: 0 32px 18px 0;
    font-size: 22px;
    font-weight: 800;
    line-height: 1.3;
}

.modal-message {
    margin: 0;
    color: var(--modal-muted);
    font-size: 16px;
    line-height: 1.7;
}

.modal-card input,
.modal-card textarea,
.modal-card select,
.modal-card code,
.modal-card pre,
.modal-card blockquote,
.modal-card table,
.modal-card li {
    color: var(--modal-text);
}

.modal-card code,
.modal-card pre,
.modal-card blockquote {
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--kbd-bg);
}

.modal-card table {
    width: 100%;
    border-collapse: collapse;
}

.modal-card th,
.modal-card td {
    border: 1px solid var(--line);
    padding: 8px;
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    min-height: 27px;
    padding: 3px 8px;
    border: 1px solid var(--kbd-border);
    border-radius: 5px;
    background: var(--kbd-bg);
    color: var(--modal-text);
    box-shadow: var(--kbd-shadow);
    font-size: 13px;
    font-family: inherit;
    font-weight: 700;
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.modal-btn {
    min-width: 116px;
    min-height: 42px;
    padding: 10px 22px;
    border: 0;
    border-radius: var(--radius-md);
    color: var(--on-accent);
    background: var(--modal-btn-bg);
    font-size: 15px;
    transition: transform 0.18s ease, background 0.18s ease;
}

.modal-btn:hover {
    transform: translateY(-1px);
    background: var(--modal-btn-hover);
}

.modal-btn.secondary {
    color: var(--modal-secondary-text);
    background: var(--modal-secondary-bg);
}

.modal-btn.secondary:hover {
    background: var(--modal-secondary-hover);
}

/* ============================================================
   17. 响应式适配
   ============================================================ */
@media (max-width: 900px) {
    :root {
        --nav-height: 118px;
    }

    .tool-btn {
        font-size: 16px;
    }

    .nav-link {
        min-height: 32px;
        padding: 6px 11px;
        font-size: 15px;
    }
}

@media (max-width: 560px) {
    :root {
        --nav-height: 138px;
    }

    .tool-btn {
        font-size: 15px;
    }

    .home-view {
        padding: 28px 16px;
    }

    .modal-card {
        padding: 26px 20px 22px;
    }
}

/* ============================================================
   18. 使用说明悬停提示框（#helpBtn）
   ============================================================ */
.help-wrap {
    position: relative;
}

/* 悬停桥接：填补按钮与提示框之间的间隙，避免鼠标移动时丢失 hover */
.help-wrap::after {
    content: "";
    position: absolute;
    top: 100%;
    right: 0;
    width: 340px;
    max-width: 86vw;
    height: 14px;
    pointer-events: auto;
}

.help-tip {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    z-index: 60;
    width: 340px;
    max-width: 86vw;
    padding: 16px 18px 14px;
    border: 1px solid var(--tooltip-border);
    border-radius: var(--radius-card);
    background: var(--tooltip-bg);
    color: var(--tooltip-text);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.38);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px) scale(0.98);
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
    font-size: 13px;
    line-height: 1.6;
}

.help-wrap:hover .help-tip,
.help-wrap:focus-within .help-tip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

/* 顶部小箭头 */
.help-tip::before {
    content: "";
    position: absolute;
    top: -7px;
    right: 24px;
    width: 12px;
    height: 12px;
    border-top: 1px solid var(--tooltip-border);
    border-left: 1px solid var(--tooltip-border);
    background: var(--tooltip-bg);
    transform: rotate(45deg);
    border-top-left-radius: 3px;
}

.help-tip-title {
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--tooltip-border);
    font-size: 15px;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: 0.2px;
}

.help-tip-list {
    margin: 0 0 10px;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 9px;
}

.help-tip-list li,
.help-tip-note {
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.help-tip-ic {
    flex: 0 0 auto;
    line-height: 1.6;
    font-size: 14px;
}

.help-tip-note {
    padding: 9px 11px;
    margin-bottom: 11px;
    border-radius: var(--radius-md);
    background: rgba(var(--color-primary-rgb) / 0.10);
    border: 1px solid var(--tooltip-border);
}

.help-tip-dl {
    padding-top: 10px;
    border-top: 1px dashed var(--tooltip-border);
    color: var(--tooltip-text);
}

.help-tip-dl a {
    color: var(--color-primary);
    font-weight: 700;
    word-break: break-all;
    text-decoration: none;
    border-bottom: 1px solid rgba(var(--color-primary-rgb) / 0.4);
    transition: color 0.18s ease, border-color 0.18s ease;
}

.help-tip-dl a:hover {
    color: var(--color-primary-hover);
    border-bottom-color: var(--color-primary-hover);
}

.help-tip b {
    font-weight: 700;
    color: var(--color-ink);
}