/* ==================== 基础重置与高级变量 ==================== */
:root {
    /* 字体栈：优先使用 Apple 和 Windows 的高级字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    
    /* 色彩 */
    --text-main: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --color-primary: #3370ff;
    --color-primary-hover: #4e83fd;
    --color-danger: #f54a45;
    
    /* 玻璃拟态容器变量 */
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.3); /* 顶部高光 */
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.2); /* 柔和弥散阴影 */
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-sans);
    background-color: #000;
    color: var(--text-main);
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.hidden { display: none !important; }

/* ==================== 自定义极简滚动条 ==================== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { 
    background: rgba(255, 255, 255, 0.2); 
    border-radius: 4px; 
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.4); }

/* ==================== 全局背景视频（GPU加速） ==================== */
#bg-video {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    object-fit: cover;
    z-index: -2; 
    filter: brightness(0.85); 
    
    /* 【核心优化】开启硬件加速，防止画面撕裂 */
    transform: translateZ(0);
    will-change: transform;
    pointer-events: none; 
}

/* ==================== 论坛容器入场动画 ==================== */
#forum-wrapper {
    animation: fadeInForum 0.6s ease forwards;
}
@keyframes fadeInForum {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==================== 启动页遮罩 ==================== */
#intro-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: transparent; 
    z-index: 99999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.6s ease, visibility 0.6s ease; 
    will-change: opacity;
}
#intro-overlay.fade-out { opacity: 0; visibility: hidden; pointer-events: none; }

/* ==================== 极致丝滑的透明按钮 ==================== */
#enter-btn {
    position: relative;
    z-index: 10;
    padding: 12px 40px;
    font-size: 16px; 
    font-weight: 600;
    letter-spacing: 2px; 
    
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1); 
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 50px; 
    cursor: pointer;
    
    box-shadow: var(--glass-highlight), 0 4px 20px rgba(0, 0, 0, 0.3);
        
    transform: translateZ(0);
    will-change: transform, opacity;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    opacity: 0;
    transform: translateY(15px) translateZ(0);
    animation: btnFadeInUp 0.6s ease-out 1s forwards;
}

#enter-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.9);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), 0 8px 25px rgba(0, 0, 0, 0.5), 0 0 15px rgba(255,255,255,0.2);
    transform: translateY(-2px) scale(1.02) translateZ(0);
}

#enter-btn:active { transform: translateY(1px) scale(0.96) translateZ(0); }

@keyframes btnFadeInUp {
    to { opacity: 1; transform: translateY(0) translateZ(0); }
}

/* ==================== 顶部导航 ==================== */
header { 
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border); 
    position: sticky; top: 0; z-index: 100; 
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
nav { 
    max-width: 1100px; margin: 0 auto; padding: 0 24px; height: 64px; 
    display: flex; justify-content: space-between; align-items: center; 
}
.logo { font-size: 1.25rem; font-weight: 700; color: var(--text-main); text-decoration: none; letter-spacing: 1px; text-shadow: 0 2px 4px rgba(0,0,0,0.5); }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.nav-user-info { display: flex; align-items: center; gap: 12px; }
.nav-avatar { width: 34px; height: 34px; border-radius: 50%; object-fit: cover; border: 2px solid rgba(255,255,255,0.3); }
.user-meta { display: flex; flex-direction: column; }
.user-name { font-size: 0.9rem; font-weight: 600; text-shadow: 0 1px 2px rgba(0,0,0,0.5); }
.upload-label { font-size: 0.75rem; color: var(--color-primary); cursor: pointer; text-shadow: none; font-weight: 500; transition: color 0.2s; }
.upload-label:hover { color: #fff; text-decoration: underline; }

/* ==================== 按钮通用 ==================== */
button {
    cursor: pointer; font-size: 0.9rem; font-weight: 600;
    padding: 8px 20px; border-radius: var(--radius-sm);
    font-family: inherit; transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1); 
    border: none;
    display: inline-flex; align-items: center; justify-content: center;
    letter-spacing: 0.5px;
}
button:active { transform: scale(0.96); }

.btn-primary { 
    background: linear-gradient(135deg, #3370ff, #4e83fd); 
    color: #fff; 
    box-shadow: 0 4px 12px rgba(51, 112, 255, 0.4), inset 0 1px 1px rgba(255,255,255,0.3); 
}
.btn-primary:hover { 
    background: linear-gradient(135deg, #4e83fd, #6495ff); 
    box-shadow: 0 6px 16px rgba(51, 112, 255, 0.6), inset 0 1px 1px rgba(255,255,255,0.4); 
    transform: translateY(-1px);
}

.btn-outline { 
    background: rgba(255, 255, 255, 0.1); 
    border: 1px solid rgba(255, 255, 255, 0.3); 
    color: var(--text-main); 
    backdrop-filter: blur(4px); 
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.25); border-color: rgba(255, 255, 255, 0.6); }

.btn-danger { background: var(--color-danger); color: #fff; box-shadow: 0 4px 12px rgba(245, 74, 69, 0.3); }
.btn-danger:hover { background: #ff6b66; box-shadow: 0 6px 16px rgba(245, 74, 69, 0.5); transform: translateY(-1px); }

/* ==================== 分类标签栏 ==================== */
.category-bar-container { 
    background: rgba(255, 255, 255, 0.05); 
    backdrop-filter: blur(16px); 
    border-bottom: 1px solid var(--glass-border); 
}
.category-bar { 
    max-width: 1100px; margin: 0 auto; padding: 14px 24px; 
    display: flex; gap: 12px; flex-wrap: wrap; align-items: center; 
}

.category-tag { 
    display: flex; align-items: center; padding: 6px 16px; border-radius: 20px; 
    background: rgba(255,255,255,0.1); 
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1); 
    position: relative; 
    border: 1px solid transparent;
}
.category-tag:hover { background: rgba(255,255,255,0.2); transform: translateY(-1px); }
.category-tag .cat-text { font-size: 0.95rem; color: var(--text-main); font-weight: 500; user-select: none; cursor: pointer; letter-spacing: 0.5px; }

.category-tag.active { 
    background: var(--color-primary); 
    border-color: rgba(255,255,255,0.3);
    box-shadow: 0 4px 12px rgba(51, 112, 255, 0.4), inset 0 1px 1px rgba(255,255,255,0.4); 
}
.category-tag.active .cat-text { color: #ffffff; font-weight: 600; }

.delete-cat-btn { background: none; border: none; color: rgba(255,255,255,0.5); font-size: 1.1rem; font-weight: bold; margin-left: 8px; padding: 0; line-height: 1; box-shadow: none; transition: color 0.2s;}
.delete-cat-btn:hover { color: var(--color-danger); background: transparent;}
.delete-cat-btn:active { transform: scale(0.8); }
.category-tag.active .delete-cat-btn { color: rgba(255,255,255,0.8); }

.add-cat-tag { 
    background: transparent; border: 1px dashed rgba(255,255,255,0.4); 
    color: rgba(255,255,255,0.7); border-radius: 20px; padding: 6px 16px; 
    font-size: 0.95rem; font-weight: 500; box-shadow: none; transition: all 0.2s;
}
.add-cat-tag:hover { border-color: #fff; color: #fff; background: rgba(255, 255, 255, 0.1); }

/* 拖拽排序 */
.category-tag[draggable="true"] { cursor: grab; }
.category-tag[draggable="true"]:active { cursor: grabbing; }
.category-tag.dragging { opacity: 0.9; background-color: var(--color-primary) !important; box-shadow: 0 15px 30px rgba(51, 112, 255, 0.35); transform: scale(1.05) rotate(3deg); z-index: 100; transition: none !important; }
.category-tag.dragging .cat-text { color: #ffffff !important; font-weight: 600; }
.category-tag.dragging .delete-cat-btn { color: rgba(255, 255, 255, 0.7) !important; }
.category-tag.drag-left::before { content: ""; position: absolute; left: -8px; top: 15%; height: 70%; width: 3px; background-color: var(--color-primary); border-radius: 3px; box-shadow: 0 0 8px var(--color-primary); animation: pulseIndicator 1s infinite alternate; }
.category-tag.drag-right::after { content: ""; position: absolute; right: -8px; top: 15%; height: 70%; width: 3px; background-color: var(--color-primary); border-radius: 3px; box-shadow: 0 0 8px var(--color-primary); animation: pulseIndicator 1s infinite alternate; }
@keyframes pulseIndicator { from { opacity: 0.6; } to { opacity: 1; } }

/* ==================== 主内容卡片 ==================== */
main { max-width: 1100px; margin: 32px auto; padding: 0 24px; position: relative; z-index: 10;}

.category-content-area { 
    background: var(--glass-bg); 
    backdrop-filter: blur(24px); 
    -webkit-backdrop-filter: blur(24px);
    border-radius: var(--radius-lg); 
    box-shadow: var(--glass-shadow), var(--glass-highlight); 
    padding: 40px; 
    min-height: 500px; 
    border: 1px solid var(--glass-border); 
}

.panel-header { 
    display: flex; justify-content: space-between; align-items: flex-start; 
    padding-bottom: 24px; margin-bottom: 24px; 
    border-bottom: 1px solid rgba(255, 255, 255, 0.15); 
}
.author-info { display: flex; align-items: center; gap: 16px; }
.author-avatar { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; border: 2px solid rgba(255,255,255,0.2); }
.author-meta { display: flex; flex-direction: column; }
.author-name { font-size: 1.1rem; font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 8px; text-shadow: 0 1px 3px rgba(0,0,0,0.6); letter-spacing: 0.5px; }
.publish-time { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; font-family: var(--font-mono); letter-spacing: 0.5px;}
.badge { background: rgba(244, 63, 94, 0.2); border: 1px solid rgba(244, 63, 94, 0.5); color: #ff8a9f; font-size: 0.75rem; padding: 2px 8px; border-radius: 12px; font-weight: 600; }

/* ==================== 文本内容区 ==================== */
.chat-text-content { 
    font-size: 1.05rem; 
    line-height: 1.8; 
    color: var(--text-main); 
    white-space: pre-wrap; 
    word-wrap: break-word; 
    min-height: 100px; 
    text-shadow: 0 1px 2px rgba(0,0,0,0.5); 
    letter-spacing: 0.3px;
    font-family: var(--font-sans);
}

.chat-text-content code, .chat-text-content pre {
    font-family: var(--font-mono);
    background: rgba(0,0,0,0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.95em;
    color: #a8c7fa;
}

.chat-text-content[contenteditable="true"] { 
    cursor: text; 
    background-color: rgba(0, 0, 0, 0.2); 
    border: 1px solid rgba(255,255,255,0.3); 
    border-radius: var(--radius-md); 
    padding: 20px; 
    margin: -20px; 
    outline: none; 
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.2), 0 0 0 3px rgba(51, 112, 255, 0.3); 
    transition: all 0.2s; 
}

/* ==================== 弹窗基础架构（全面暗黑磨砂化） ==================== */
.modal { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; display: flex; justify-content: center; align-items: center; z-index: 10000; }

/* 遮罩层加深 */
.modal-overlay { 
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; 
    background-color: rgba(0, 0, 0, 0.6); 
    backdrop-filter: blur(10px); 
    -webkit-backdrop-filter: blur(10px); 
    animation: overlayFade 0.3s ease-out; 
}

/* 弹窗主体：改为深色半透明玻璃 */
.modal-content { 
    position: relative; 
    background: rgba(30, 30, 35, 0.85); /* 深色半透明 */
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    width: 90%; 
    border-radius: var(--radius-lg); 
    padding: 32px; 
    z-index: 10001; 
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.1); 
    border: 1px solid rgba(255, 255, 255, 0.15);
    animation: modalSpring 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
    color: #fff; /* 全局文字颜色改为白色 */
}

@keyframes overlayFade { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalSpring { from { opacity: 0; transform: translateY(30px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }

.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.modal-header h2 { font-size: 1.3rem; color: #fff; margin: 0; font-weight: 700; letter-spacing: 0.5px; }
.close-btn { background: none; border: none; font-size: 1.8rem; color: rgba(255, 255, 255, 0.6); cursor: pointer; padding: 0; line-height: 1; transition: color 0.2s; }
.close-btn:hover { color: #fff; }
.close-btn:active { transform: scale(0.9); }

/* 表单和输入框适配深色 */
.form-group { margin-bottom: 20px; display: flex; flex-direction: column; }
.form-group label { margin-bottom: 8px; font-size: 0.9rem; font-weight: 600; color: rgba(255, 255, 255, 0.8); }

.form-group input { 
    padding: 12px 16px; 
    border: 1px solid rgba(255, 255, 255, 0.2); 
    border-radius: var(--radius-md); 
    font-family: inherit; 
    font-size: 1rem; 
    transition: all 0.2s; 
    background: rgba(0, 0, 0, 0.3); /* 输入框深色背景 */
    color: #fff; 
}
.form-group input::placeholder { color: rgba(255, 255, 255, 0.4); }
.form-group input:hover { border-color: rgba(255, 255, 255, 0.4); }
.form-group input:focus { 
    outline: none; 
    border-color: var(--color-primary); 
    background: rgba(0, 0, 0, 0.5); 
    box-shadow: 0 0 0 3px rgba(51, 112, 255, 0.3); 
}

.modal-footer { margin-top: 28px; display: flex; gap: 12px; justify-content: flex-end; }
.error-msg { color: #ff8a9f; font-size: 0.85rem; margin-top: 8px; animation: overlayFade 0.2s; }

/* 强制覆盖确认弹窗的内联灰字 */
#confirm-msg { color: rgba(255, 255, 255, 0.8) !important; font-size: 1.05rem; margin-bottom: 24px; }

/* 密码小眼睛 */
.password-wrapper { position: relative; display: flex; align-items: center; }
.password-wrapper input { width: 100%; padding-right: 44px; }
.eye-icon { position: absolute; right: 14px; cursor: pointer; color: rgba(255, 255, 255, 0.6); display: flex; transition: color 0.2s; }
.eye-icon svg { width: 20px; height: 20px; }
.eye-icon:hover { color: #fff; }

/* ==================== 顶部 Toast 提示 ==================== */
.toast {
    position: fixed; top: -60px; left: 50%; 
    transform: translateX(-50%) translateY(-20px);
    background-color: rgba(30, 30, 30, 0.9); 
    backdrop-filter: blur(12px); 
    color: #fff;
    padding: 12px 24px; border-radius: 30px; 
    font-size: 0.95rem; font-weight: 600;
    z-index: 20000; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.3), inset 0 1px 1px rgba(255,255,255,0.2); 
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); 
    pointer-events: none;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 0.5px;
}
.toast::before {
    content: "✓"; display: flex; justify-content: center; align-items: center;
    width: 20px; height: 20px; background-color: #00c853; color: #fff; border-radius: 50%; font-size: 12px; font-weight: bold;
}
.toast.show { top: 30px; opacity: 1; transform: translateX(-50%) translateY(0); }

/* ==================== 标签切换平滑过渡动画 ==================== */
.chat-text-content {
    transition: opacity 0.2s ease, transform 0.2s ease;
    will-change: opacity, transform;
}

.chat-text-content.fade-out-content {
    opacity: 0;
    transform: translateY(8px);
}

.chat-text-content.fade-in-content {
    animation: fadeInText 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes fadeInText {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.publish-time {
    transition: opacity 0.2s ease;
}
.publish-time.fade-out-content {
    opacity: 0;
}