/* ============================================================
   1. 字体
   ============================================================ */
@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"] {
    /* 基础色板 */
    --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;
    --color-strong: #FF3E96;

    /* RGB 通道 */
    --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);

    /* 提示框 */
    --tooltip-bg: rgba(30, 32, 41, 0.96);
    --tooltip-border: rgba(255, 255, 255, 0.10);
    --tooltip-text: #F2F4F8;

    /* 圆角 */
    --radius-card: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;

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

/* ============================================================
   3. CSS 变量：浅色主题
   ============================================================ */
[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: #522fff;
    --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);

    --tooltip-bg: rgba(255, 255, 255, 0.98);
    --tooltip-border: rgba(0, 0, 0, 0.08);
    --tooltip-text: #1D1D1F;

    --radius-card: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;

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

/* ============================================================
   4. 页面主体背景
   ============================================================ */
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);
}

/* ============================================================
   5. 文本选区色
   ============================================================ */
::selection {
    background-color: rgba(0, 102, 255, 0.6);
    color: var(--color-ink);
}

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

/* ============================================================
   7. 主题切换按钮
   ============================================================ */
#theme-toggle {
    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;
}

#theme-toggle:hover {
    box-shadow: 0 0 0 3px rgb(var(--color-primary-rgb) / 0.15);
    transform: none;
}

#theme-toggle:active {
    transform: scale(0.92);
    transition: transform 0.15s ease;
}

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

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

/* ============================================================
   8. 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;
}

/* ============================================================
   9. Markdown 预览区样式
   ============================================================ */
#preview > *:first-child {
    margin-top: 0 !important;
}

/* --- 标题 --- */
#preview h1,
#preview h2,
#preview h3,
#preview h4,
#preview h5,
#preview h6 {
    margin-top: 1.8em;
    margin-bottom: 0.8em;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-ink);
    letter-spacing: -0.02em;
}

#preview h1 {
    font-size: 2rem;
    font-weight: 800;
    padding-bottom: 0.4em;
    border-bottom: 2px solid var(--color-line);
    font-family: "Noto Serif SC", ui-serif, Georgia, serif;
}

#preview h2 {
    font-size: 1.6rem;
    padding-bottom: 0.35em;
    border-bottom: 1px solid var(--color-line);
    font-family: "Noto Serif SC", ui-serif, Georgia, serif;
}

#preview h3 { font-size: 1.4rem; }

#preview h4 { font-size: 1.2rem; }

#preview h5 { font-size: 1rem; }

#preview h6 {
    font-size: 0.95rem;
    color: var(--color-ink-faint);
}

/* --- 段落 / 列表 / 引用 --- */
#preview p {
    margin-bottom: 1.1em;
    line-height: 1.75;
}

#preview ul,
#preview ol {
    margin-bottom: 1.1em;
    padding-left: 1.8em;
}

#preview ul  { list-style-type: disc; }
#preview ol  { list-style-type: decimal; }
#preview ul ul { list-style-type: circle;  margin: 0.3em 0; }
#preview ol ol { list-style-type: lower-alpha; margin: 0.3em 0; }
#preview ul ol,
#preview ol ul { margin: 0.3em 0; }

#preview li {
    margin-bottom: 0.35em;
    line-height: 1.7;
}

#preview li > p {
    margin-bottom: 0.5em;
}

#preview li > p:last-child {
    margin-bottom: 0;
}

#preview ul.contains-task-list,
#preview ol.contains-task-list {
    list-style: none;
    padding-left: 0;
}

#preview li.task-list-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

#preview li.task-list-item input[type="checkbox"] {
    margin-top: 0.35em;
    width: 16px;
    height: 16px;
    cursor: default;
    accent-color: var(--color-primary);
}

#preview blockquote {
    margin: 1.2em 0;
    padding: 0.8em 1.2em;
    border-left: 4px solid var(--color-primary);
    background: var(--color-elevated);
    border-radius: 0 8px 8px 0;
    color: var(--color-ink-soft);
}

#preview blockquote p:last-child {
    margin-bottom: 0;
}

/* --- 代码 --- */
#preview code {
    font-family: 'f7', ui-monospace, monospace;
    font-size: 0.85em;
    background: var(--color-elevated);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    color: var(--color-info);
    border: 1px solid var(--color-line);
}

#preview pre {
    background: var(--color-elevated);
    border-radius: 12px;
    padding: 16px 20px;
    overflow-x: auto;
    margin-bottom: 1.2em;
    border: 1px solid var(--color-line);
}

#preview pre code {
    font-size: 0.85rem;
    line-height: 1.6;
    color: inherit;
    background: transparent;
    padding: 0;
    border: none;
    border-radius: 0;
}

/* --- 表格 --- */
#preview table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.2em;
    font-size: 0.9rem;
    border-radius: 8px;
    overflow: hidden;
}

#preview th,
#preview td {
    border: 1px solid var(--color-line);
    padding: 10px 14px;
    text-align: left;
}

#preview th {
    background: var(--color-elevated);
    font-weight: 700;
    color: var(--color-ink);
}

#preview tr:nth-child(even) { background: var(--color-elevated); }
#preview tr:hover { background: var(--color-surface); }

/* --- 图片 / 链接 / 分隔线 / 强调 --- */
#preview img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 0.5em 0;
}

#preview a {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

#preview a:hover {
    border-bottom-color: var(--color-primary);
    transform: none;
}

#preview hr {
    border: none;
    border-top: 2px solid var(--color-line);
    margin: 2em 0;
}

#preview strong {
    font-weight: 700;
    color: var(--color-strong);
}

#preview em  { font-style: italic; }
#preview del { opacity: 0.6; text-decoration: line-through; }

/* ============================================================
   10. Toast 通知
   ============================================================ */
#toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   11. 全局滚动条美化
   ============================================================ */
/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-line) transparent;
}

/* Webkit */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track { background: transparent; }

::-webkit-scrollbar-thumb {
    background: var(--color-line);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-line-strong);
}

/* 预览区代码块内滚动条 */
#preview pre::-webkit-scrollbar-thumb {
    background: var(--color-line-strong);
    border-radius: 3px;
}

#preview pre::-webkit-scrollbar-thumb:hover {
    background: var(--color-ink-faint);
}

/* ============================================================
   12. 按钮 / 链接悬停放大动画
   ============================================================ */
button,
a {
    transition: transform 0.2s ease;
}

button:hover,
a:hover {
    transform: scale(1.05);
}

/* ============================================================
   13. 使用说明悬停提示框
   ============================================================ */
.help-wrap {
    position: relative;
}

.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;
}

.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);
}

/* ============================================================
   14. 隐藏文件上传控件
   ============================================================ */
#file-input {
    display: none;
}