/* HoloLake公告栏系统深色科技风 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: #0a1628;
    color: #e0e6ed;
    min-height: 100vh;
}

.app-container {
    max-width: 580px;
    margin: 0 auto;
    padding: 0 16px;
}

/* ========== 顶部标题栏 ========== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.header h1 {
    font-size: 22px;
    font-weight: 700;
    color: #e0e6ed;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.pinned-badge {
    background: rgba(255, 183, 77, 0.15);
    color: #ffb74d;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 600;
}

.subscribe-btn {
    background: rgba(79, 195, 247, 0.1);
    color: #4fc3f7;
    border: 1px solid rgba(79, 195, 247, 0.2);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
}

.subscribe-btn:hover {
    background: rgba(79, 195, 247, 0.2);
}

/* ========== 频道栏 ========== */
.channel-bar {
    display: flex;
    gap: 8px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    overflow-x: auto;
}

.channel {
    padding: 8px 18px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
    background: transparent;
    color: #8899aa;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.channel:hover {
    border-color: rgba(255, 183, 77, 0.3);
    color: #b0bec5;
}

.channel.active {
    background: rgba(255,183,77,0.15);
    border-color: #ffb74d;
    color: #ffb74d;
    font-weight: 600;
}

/* ========== 公告列表 ========== */
.bulletin-list {
    padding: 16px 0;
}

.bulletin-card {
    position: relative;
    display: flex;
    gap: 16px;
    padding: 16px;
    border-radius: 12px;
    background: rgba(20, 30, 45, 0.6);
    border: 1px solid rgba(255,255,255,0.04);
    margin-bottom: 12px;
    transition: all 0.2s ease;
}

.bulletin-card.pinned {
    border: 1px solid rgba(255, 183, 77, 0.3);
    background: rgba(255, 183, 77, 0.02);
}

.pin-indicator {
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 11px;
    color: #ffb74d;
    font-weight: 600;
}

/* 公告图标 */
.bulletin-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.bulletin-icon.system { background: rgba(156,39,176,0.12); }
.bulletin-icon.dev { background: rgba(76,175,80,0.12); }
.bulletin-icon.team { background: rgba(79,195,247,0.12); }

/* 公告内容 */
.bulletin-content {
    flex: 1;
    min-width: 0;
}

.bulletin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.bulletin-title {
    font-size: 15px;
    font-weight: 600;
    color: #e0e6ed;
}

.bulletin-time {
    font-size: 12px;
    color: #556677;
    flex-shrink: 0;
    margin-left: 12px;
}

.bulletin-summary {
    font-size: 13px;
    color: #8899aa;
    line-height: 1.6;
    margin-bottom: 10px;
}

/* 公告底部 */
.bulletin-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bulletin-tag {
    display: inline-block;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 6px;
    font-weight: 500;
}

.tag-system { background: rgba(156,39,176,0.12); color: #ce93d8; }
.tag-dev { background: rgba(76,175,80,0.12); color: #81c784; }
.tag-team { background: rgba(79,195,247,0.12); color: #4fc3f7; }

.bulletin-author {
    font-size: 11px;
    color: #556677;
}

/* ========== 底部状态栏 ========== */
.footer {
    display: flex;
    justify-content: space-between;
    padding: 20px 0;
    border-top: 1px solid rgba(255,255,255,0.06);
    font-size: 12px;
    color: #556677;
}

.footer-brand {
    color: rgba(255, 183, 77, 0.5);
}

/* ========== 环节2：响应式布局（爸爸的深色科技风） ========== */

/* 平板（宽度 768px 以下） */
@media (max-width: 768px) {
    .app-container {
        max-width: 100%;
        padding: 0 12px;
    }
    .header h1 {
        font-size: 18px;
    }
    .channel-bar {
        gap: 6px;
        padding: 12px 0;
    }
    .channel {
        padding: 6px 14px;
        font-size: 12px;
    }
    .bulletin-card {
        padding: 12px 10px;
    }
    .channel-bar {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .channel-bar::-webkit-scrollbar {
        display: none;
    }
    .bulletin-card {
        flex-direction: column;
        gap: 8px;
    }
    .bulletin-icon {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    .bulletin-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    .bulletin-time {
        margin-left: 0;
    }
    .pin-indicator {
        top: 6px;
        right: 8px;
        font-size: 10px;
    }
    .footer {
        flex-direction: column;
        gap: 4px;
        text-align: center;
    }
}

/* 手机（宽度 480px 以下）- 复用平板样式，只调更小字体 */
@media (max-width: 480px) {
    .header h1 {
        font-size: 16px;
    }
    .subscribe-btn {
        padding: 4px 10px;
        font-size: 12px;
    }
    .channel {
        padding: 4px 10px;
        font-size: 11px;
    }
    .bulletin-title {
        font-size: 14px;
    }
    .bulletin-summary {
        font-size: 12px;
    }
}

/* 已读公告样式 */
.bulletin-card.read {
    opacity: 0.6;
}
.bulletin-card.read .bulletin-title {
    color: #8899aa;
}

/* 订阅按钮激活状态 */
.subscribe-btn.active {
    background: rgba(79, 195, 247, 0.25);
    border-color: #4fc3f7;
    color: #4fc3f7;
}

/* ========== 环节3：过渡动画 ========== */

/* 公告卡片：悬停上移 + 阴影加深 */
.bulletin-card {
    transition: all 0.3s ease;
}
.bulletin-card:hover {
    transform: translateY(-4px);  /* 从 -2px 改为 -4px，更明显 */
    box-shadow: 0 12px 24px rgba(0, 160, 255, 0.2);  /* 蓝色光晕 */
}
/* 订阅按钮：缩放反馈 + 颜色过渡 */
.subscribe-btn {
    transition: all 0.2s ease;
}

.subscribe-btn:hover {
    transform: scale(1.05);
}

.subscribe-btn:active {
    transform: scale(0.95);
}

/* 频道标签：背景色/文字色平滑切换 */
.channel {
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 已读公告：淡入淡出效果 */
.bulletin-card.read {
    transition: opacity 0.5s ease;
}
/* ========== 环节3：关键帧动画 ========== */

/* 淡入浮起动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 为每个公告卡片添加动画 */
.bulletin-card {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0; /* 动画开始前隐藏 */
}

/* 按索引依次延迟出现 */
.bulletin-card:nth-child(1) { animation-delay: 0.1s; }
.bulletin-card:nth-child(2) { animation-delay: 0.2s; }
.bulletin-card:nth-child(3) { animation-delay: 0.3s; }
.bulletin-card:nth-child(4) { animation-delay: 0.4s; }
.bulletin-card:nth-child(5) { animation-delay: 0.5s; }
.bulletin-card:nth-child(6) { animation-delay: 0.6s; }
/* 如果卡片超过6张，继续往后加 */
/* ========== 环节3：光湖水面效果 ========== */

/* Header 光湖呼吸渐变 */
.header {
    background: linear-gradient(135deg, #0a2a4a 0%, #1b4a6b 50%, #0a2a4a 100%);
    background-size: 200% 200%;
    animation: breathe 8s ease-in-out infinite;
    position: relative;
    overflow: hidden;
}

/* 呼吸动画 */
@keyframes breathe {
    0% { background-position: 0% 0%; }
    50% { background-position: 100% 100%; }
    100% { background-position: 0% 0%; }
}

/* 微光扫过效果 */
.header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transform: translateX(-100%);
    animation: shimmer 6s infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    20% { transform: translateX(100%); }
    100% { transform: translateX(100%); }
}

/* 频道栏底部边缘（水面倒影） */
.channel-bar {
    border-bottom: 1px solid rgba(79, 195, 247, 0.2);
    position: relative;
}

.channel-bar::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #4fc3f7, transparent);
    opacity: 0.3;
}
/* 订阅按钮脉冲效果 */
.subscribe-btn.pulse {
    animation: pulse 0.3s ease;
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(79, 195, 247, 0.7); }
    70% { transform: scale(1.1); box-shadow: 0 0 10px 5px rgba(79, 195, 247, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(79, 195, 247, 0); }
}