/* ============ 讨论区页面 - 高质量设计 ============ */

/* 变量定义 */
:root {
  --discuss-primary: #f38020;
  --discuss-primary-dark: #e67212;
  --discuss-bg: #f8f9fa;
  --discuss-card: #ffffff;
  --discuss-border: #e8e8e8;
  --discuss-text: #1d1d1f;
  --discuss-text-muted: #666666;
  --discuss-text-light: #999999;
  --discuss-online: #34c759;
  --discuss-radius: 12px;
  --discuss-shadow: 0 2px 8px rgba(0,0,0,0.06);
  --discuss-shadow-hover: 0 4px 16px rgba(0,0,0,0.1);
}

/* ============ 主体布局 ============ */
.discussion-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px 120px;
  background: var(--discuss-bg);
  min-height: calc(100vh - 72px);
}

/* ============ 讨论区头部 ============ */
.discussion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--discuss-border);
  background: var(--discuss-card);
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
  position: sticky;
  top: 72px;
  z-index: 10;
}

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

.discussion-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--discuss-text);
  margin: 0;
}

.title-icon {
  font-size: 24px;
}

.discussion-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.online-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: #f5f5f5;
  border-radius: 20px;
  font-size: 14px;
  color: var(--discuss-text-muted);
}

.online-dot {
  width: 10px;
  height: 10px;
  background: var(--discuss-online);
  border-radius: 50%;
  animation: pulse-online 2s infinite;
}

@keyframes pulse-online {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.9); }
}

.online-text {
  color: var(--discuss-text-light);
}

/* ============ 排序标签 ============ */
.sort-tabs {
  display: flex;
  gap: 8px;
  padding: 16px 0;
}

.sort-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border: none;
  background: var(--discuss-card);
  border-radius: 20px;
  font-size: 14px;
  color: var(--discuss-text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--discuss-shadow);
}

.sort-tab:hover {
  color: var(--discuss-text);
  transform: translateY(-1px);
}

.sort-tab.active {
  background: var(--discuss-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(243, 128, 32, 0.3);
}

.tab-icon {
  font-size: 16px;
}

/* ============ 评论区容器 ============ */
.discussion-container {
  display: flex;
  gap: 24px;
}

/* ============ 参与者侧边栏 ============ */
.members-sidebar {
  width: 180px;
  flex-shrink: 0;
  display: none;
}

@media (min-width: 1024px) {
  .members-sidebar {
    display: flex;
    flex-direction: column;
  }
}

.members-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--discuss-card);
  border-radius: var(--discuss-radius);
  margin-bottom: 12px;
  box-shadow: var(--discuss-shadow);
}

.members-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--discuss-text);
}

.members-count {
  font-size: 12px;
  color: var(--discuss-text-light);
  background: var(--discuss-bg);
  padding: 2px 8px;
  border-radius: 10px;
}

.members-list {
  background: var(--discuss-card);
  border-radius: var(--discuss-radius);
  padding: 12px;
  box-shadow: var(--discuss-shadow);
  max-height: 400px;
  overflow-y: auto;
}

.member-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: 10px;
  margin-bottom: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.member-item:hover {
  background: var(--discuss-bg);
}

.member-item:last-child {
  margin-bottom: 0;
}

.member-avatar {
  width: 40px;
  height: 40px;
  background: var(--discuss-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
  position: relative;
}

.member-online-dot {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 12px;
  height: 12px;
  background: var(--discuss-online);
  border-radius: 50%;
  border: 2px solid var(--discuss-card);
}

.member-info {
  flex: 1;
  min-width: 0;
}

.member-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--discuss-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.member-status {
  font-size: 11px;
  color: var(--discuss-text-light);
}

/* ============ 消息区域 ============ */
.messages-section {
  flex: 1;
  min-width: 0;
}

/* ============ 消息列表 ============ */
.messages-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ============ 消息卡片 ============ */
.message-card {
  background: var(--discuss-card);
  border-radius: var(--discuss-radius);
  padding: 16px;
  box-shadow: var(--discuss-shadow);
  transition: all 0.2s ease;
}

.message-card:hover {
  box-shadow: var(--discuss-shadow-hover);
}

.message-card.pinned {
  border-left: 4px solid var(--discuss-primary);
  background: linear-gradient(135deg, #fffbf7 0%, var(--discuss-card) 100%);
}

/* 消息头部 */
.message-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.message-avatar {
  width: 44px;
  height: 44px;
  background: var(--discuss-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.message-meta {
  flex: 1;
  min-width: 0;
}

.message-author {
  font-size: 15px;
  font-weight: 600;
  color: var(--discuss-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.message-badge {
  padding: 2px 8px;
  background: var(--discuss-primary);
  color: #fff;
  font-size: 10px;
  border-radius: 4px;
  font-weight: 500;
}

.message-time {
  font-size: 12px;
  color: var(--discuss-text-light);
  margin-top: 2px;
}

/* 消息内容 */
.message-content {
  font-size: 15px;
  line-height: 1.7;
  color: var(--discuss-text);
  margin-bottom: 12px;
  word-break: break-word;
}

.message-content .mention {
  color: var(--discuss-primary);
  font-weight: 500;
  background: rgba(243, 128, 32, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
}

/* 消息操作栏 */
.message-actions {
  display: flex;
  gap: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--discuss-border);
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--discuss-text-light);
  font-size: 13px;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.action-btn:hover {
  background: var(--discuss-bg);
  color: var(--discuss-text);
}

.action-btn.liked {
  color: var(--discuss-primary);
}

.action-btn.liked:hover {
  background: rgba(243, 128, 32, 0.1);
}

.action-icon {
  font-size: 16px;
}

/* ============ 回复列表 ============ */
.replies-list {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--discuss-border);
}

.reply-item {
  display: flex;
  gap: 10px;
  padding: 10px 0;
}

.reply-item:last-child {
  margin-bottom: 0;
}

.reply-avatar {
  width: 32px;
  height: 32px;
  background: var(--discuss-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.reply-content {
  flex: 1;
}

.reply-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.reply-author {
  font-size: 13px;
  font-weight: 500;
  color: var(--discuss-text);
}

.reply-to {
  color: var(--discuss-primary);
  font-size: 12px;
}

.reply-time {
  font-size: 11px;
  color: var(--discuss-text-light);
}

.reply-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--discuss-text);
}

.view-more-replies {
  padding: 8px 0;
  color: var(--discuss-primary);
  font-size: 13px;
  background: transparent;
  border: none;
  cursor: pointer;
}

/* ============ 加载更多 ============ */
.load-more {
  text-align: center;
  padding: 24px 0;
}

.load-more-btn {
  padding: 12px 28px;
  background: var(--discuss-card);
  border: 1px solid var(--discuss-border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--discuss-text-muted);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--discuss-shadow);
}

.load-more-btn:hover {
  border-color: var(--discuss-primary);
  color: var(--discuss-primary);
  transform: translateY(-2px);
}

/* ============ 空状态 ============ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.6;
}

.empty-state h3 {
  font-size: 18px;
  font-weight: 500;
  color: var(--discuss-text);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
  color: var(--discuss-text-light);
}

/* ============ 发言规则 ============ */
.rules-bar {
  text-align: center;
  padding: 16px;
  font-size: 13px;
  color: var(--discuss-text-light);
  border-top: 1px solid var(--discuss-border);
  margin-top: 16px;
}

/* ============ 固定底部输入栏 ============ */
.input-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--discuss-card);
  border-top: 1px solid var(--discuss-border);
  padding: 12px 16px;
  padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  z-index: 100;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
}

.input-bar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 1200px;
  margin: 0 auto;
}

.user-mini {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.user-avatar {
  width: 40px;
  height: 40px;
  background: var(--discuss-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.user-name {
  font-size: 11px;
  color: var(--discuss-text-light);
  max-width: 60px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.input-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  background: var(--discuss-bg);
  border-radius: 24px;
  padding: 0 6px 0 16px;
  transition: all 0.2s;
}

.input-wrapper:focus-within {
  box-shadow: 0 0 0 2px rgba(243, 128, 32, 0.2);
}

.comment-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 14px 0;
  font-size: 15px;
  color: var(--discuss-text);
  outline: none;
}

.comment-input::placeholder {
  color: var(--discuss-text-light);
}

.mention-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  font-size: 18px;
  color: var(--discuss-text-light);
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.2s;
}

.mention-btn:hover {
  background: var(--discuss-card);
  color: var(--discuss-primary);
}

.send-btn {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--discuss-primary);
  border: none;
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
}

.send-btn:hover {
  background: var(--discuss-primary-dark);
  transform: scale(1.05);
}

.send-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
}

/* ============ 回复弹窗 ============ */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
}

.modal.active {
  display: flex;
  align-items: flex-end;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
}

.modal-content {
  position: relative;
  background: var(--discuss-card);
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-height: 70vh;
  overflow: hidden;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--discuss-border);
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--discuss-text);
  margin: 0;
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  font-size: 24px;
  color: var(--discuss-text-light);
  cursor: pointer;
  border-radius: 50%;
}

.modal-close:hover {
  background: var(--discuss-bg);
}

.modal-body {
  padding: 16px 20px;
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
}

.reply-to-content {
  background: var(--discuss-bg);
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--discuss-text-muted);
}

.reply-input {
  width: 100%;
  padding: 14px;
  border: 1px solid var(--discuss-border);
  border-radius: 12px;
  resize: none;
  font-size: 15px;
  line-height: 1.6;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.reply-input:focus {
  border-color: var(--discuss-primary);
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.char-count {
  font-size: 13px;
  color: var(--discuss-text-light);
}

.modal-actions {
  display: flex;
  gap: 10px;
}

.btn-cancel {
  padding: 10px 20px;
  background: transparent;
  border: 1px solid var(--discuss-border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--discuss-text-muted);
  cursor: pointer;
}

.btn-send {
  padding: 10px 24px;
  background: var(--discuss-primary);
  border: none;
  border-radius: 8px;
  font-size: 14px;
  color: #fff;
  cursor: pointer;
}

/* ============ Toast提示 ============ */
.toast {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 12px 24px;
  background: rgba(0,0,0,0.85);
  color: #fff;
  border-radius: 24px;
  font-size: 14px;
  opacity: 0;
  transition: all 0.3s;
  z-index: 300;
  pointer-events: none;
  max-width: 90%;
  text-align: center;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  background: var(--discuss-online);
}

.toast.error {
  background: #ff4d4f;
}

/* ============ 移动端适配 ============ */
@media (max-width: 768px) {
  .discussion-main {
    padding: 0 12px 100px;
  }
  
  .discussion-header {
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
    top: 56px;
  }
  
  .discussion-title {
    font-size: 18px;
  }
  
  .input-bar {
    padding: 10px 12px;
  }
  
  .user-mini {
    display: none;
  }
  
  .input-wrapper {
    border-radius: 22px;
    padding: 0 4px 0 14px;
  }
  
  .comment-input {
    font-size: 16px; /* 防止iOS自动缩放 */
    padding: 12px 0;
  }
  
  .send-btn {
    width: 44px;
    height: 44px;
  }
  
  .message-card {
    padding: 14px;
  }
  
  .message-avatar {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }
  
  .message-author {
    font-size: 14px;
  }
  
  .message-content {
    font-size: 15px;
  }
  
  .online-badge {
    padding: 6px 10px;
    font-size: 12px;
  }
}

/* ============ 触摸优化 ============ */
@media (hover: none) and (pointer: coarse) {
  .action-btn,
  .sort-tab,
  .load-more-btn,
  .send-btn {
    min-height: 44px;
    min-width: 44px;
  }
  
  .mention-btn {
    min-width: 44px;
    min-height: 44px;
  }
}

/* ============ 滚动条美化 ============ */
.members-list::-webkit-scrollbar,
.messages-list::-webkit-scrollbar {
  width: 6px;
}

.members-list::-webkit-scrollbar-track,
.messages-list::-webkit-scrollbar-track {
  background: transparent;
}

.members-list::-webkit-scrollbar-thumb,
.messages-list::-webkit-scrollbar-thumb {
  background: var(--discuss-border);
  border-radius: 3px;
}

.members-list::-webkit-scrollbar-thumb:hover,
.messages-list::-webkit-scrollbar-thumb:hover {
  background: var(--discuss-text-light);
}