/* 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 ========================= */

/* 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;
  }
}

/* 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;
}
/* ========== 响应式断点 ========== */

/* 已读公告样式 */
.bulletin-card.read {
    opacity: 0.7;
}
.bulletin-card.read h3 {
    color: #888;
    text-decoration: line-through 1px rgba(0,0,0,0.2);
}

/* 订阅按钮激活状态 */
.subscribe-btn.active {
    border: 2px solid #0066ff;
    background-color: #e6f0ff;
    color: #0066ff;
    font-weight: bold;
}

/* 平板设备 ≤ 768px */
@media (max-width: 768px) {
    .container {
        width: 100%;
        padding: 0 20px;
    }
    
    .bulletin-header h1 {
        font-size: 1.8rem;
    }
    
    .bulletin-grid {
        gap: 12px;
    }
    
    .bulletin-card {
        padding: 12px;
    }
    
    .bulletin-card .icon {
        width: 32px;
        height: 32px;
    }
    
    .channel-tabs {
        gap: 8px;
    }
    
    .channel-tab {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}

/* 手机设备 ≤ 480px */
@media (max-width: 480px) {
    .bulletin-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .bulletin-header h1 {
        font-size: 1.5rem;
        margin-bottom: 5px;
    }
    
    .subscribe-btn {
        align-self: flex-start;
    }
    
    .bulletin-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .bulletin-card .icon {
        width: 40px;
        height: 40px;
        margin-bottom: 4px;
    }
    
    .channel-tabs {
        overflow-x: auto;
        white-space: nowrap;
        flex-wrap: nowrap;
        gap: 10px;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox隐藏滚动条 */
    }
    
    .channel-tabs::-webkit-scrollbar {
        display: none; /* Chrome/Safari隐藏滚动条 */
    }
    
    .channel-tab {
        display: inline-block;
        float: none;
        white-space: nowrap;
    }
    
    .bulletin-footer {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
}