/* =========================================
   common.css - 全站公共样式
   ========================================= */

/* 1. 全局变量与深浅色模式 */
:root {
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #ef4444;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
}

html.dark-mode {
    --bg-page: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.5);
}

/* 2. 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-page);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
    -webkit-font-smoothing: antialiased;
}

/* 3. 全站双语控制类 */
.zh-text, .en-text { display: none; }
.zh-inline, .en-inline { display: none; }

html[data-lang="zh"] .zh-text { display: block; }
html[data-lang="zh"] .zh-inline { display: inline; }
html[data-lang="en"] .en-text { display: block; }
html[data-lang="en"] .en-inline { display: inline; }

html[data-lang="zh"] .en-text, html[data-lang="zh"] .en-inline { display: none; }
html[data-lang="en"] .zh-text, html[data-lang="en"] .zh-inline { display: none; }

/* 4. 滚动条美化 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
html.dark-mode ::-webkit-scrollbar-thumb { background: #475569; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* 5. 通用底部 Footer */
.common-footer {
    text-align: center;
    padding: 24px 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
    border-top: 1px solid var(--border-color);
    background: var(--bg-card);
    margin-top: 40px;
}
.common-footer a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 6px;
    transition: color 0.2s;
}
.common-footer a:hover { color: var(--primary); }

/* 6. 悬浮工具 (回顶部、反馈) */
.common-float-tools {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 9000;
}
.common-float-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    color: var(--text-main);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
}
.common-float-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.common-float-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* 悬浮按钮 Tooltip */
.common-float-btn[data-tooltip]::before {
    content: attr(data-tooltip);
    position: absolute;
    right: 55px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    transform: translateX(5px);
    pointer-events: none;
}
.common-float-btn[data-tooltip]:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* 7. 通用弹窗框架 */
.common-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}
.common-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}
.common-modal {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}
.common-modal-overlay.active .common-modal {
    transform: translateY(0);
}
.common-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}
.common-modal-close:hover { color: var(--danger); }

/* 8. Toast 轻提示 */
.common-toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: var(--bg-card);
    color: var(--text-main);
    padding: 12px 24px;
    border-radius: 30px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 11000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    display: flex;
    align-items: center;
    gap: 8px;
}
.common-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}