/* 实时文本聊天系统 - 样式文件（重构版：保持视觉不变） */

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

/* 主题变量与视口适配 */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f3f4f6;
  --border: #e5e7eb;
  --text: #111827;
  --muted: #6b7280;
  --accent-50: #eef2ff;
  --accent-500: #6366f1;
  --accent-600: #4f46e5;
  --success: #10b981;
  --danger: #ef4444;
  --shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
  --accent-gradient: linear-gradient(
    90deg,
    var(--accent-500),
    var(--accent-600)
  );
  --vh: 1vh;
}

/* 页面基础 */
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue",
    sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.chat-container {
  width: 100%;
  max-width: 1200px;
  height: 88vh;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 头部 */
.header {
  background: var(--surface);
  color: var(--text);
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header h1 {
  font-size: 1.8rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}
.header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0.65;
}
.connection-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--muted);
}
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #c4c8d0;
  animation: pulse 2s infinite;
}
.status-dot.connected {
  background: var(--success);
}
.app-title i,
.online-users i,
.sidebar-header i {
  color: var(--accent-600);
}

/* 用户信息与导航 */
.user-setup {
  background: var(--surface);
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
}
.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  background: var(--accent-gradient);
  box-shadow: 0 0 0 2px var(--surface), 0 6px 16px rgba(17, 24, 39, 0.08);
}
.username-input {
  background: var(--surface);
  border: 1.2px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--text);
  outline: none;
  transition: border-color 0.3s;
}
.username-input::placeholder {
  color: #9aa3af;
}
.username-input:focus {
  border-color: var(--accent-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
.online-users {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--muted);
}
.mobile-nav-btn {
  display: none;
  width: 44px;
  height: 44px;
  border: none;
  margin-left: auto;
  border-radius: 12px;
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  font-size: 18px;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
  position: relative;
  overflow: hidden;
}
.mobile-nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}
.mobile-nav-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(102, 126, 234, 0.3);
}
.mobile-nav-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s;
}
.mobile-nav-btn:active::before {
  left: 100%;
}

/* 主体布局 */
.main-content {
  flex: 1;
  display: flex;
  overflow: hidden;
  background: var(--surface);
}
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
}
.messages-container {
  flex: 1;
  padding: 12px;
  background: var(--surface);
  overflow-y: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-y: contain;
}

/* 消息气泡 */
.message-bubble {
  max-width: 80%;
  min-width: 120px;
  margin-bottom: 12px;
  animation: slideIn 0.3s ease-out;
  word-wrap: break-word;
  display: flex;
  flex-direction: column;
}
.message-bubble {
  width: fit-content;
}
.message-header {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-50);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  box-shadow: none;
}
.message-bubble.own .message-avatar {
  background: var(--accent-gradient);
}
.message-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  width: fit-content;
  max-width: 80%;
}
.message-bubble.own .message-info {
  align-items: end;
  justify-items: end;
  text-align: right;
}
.message-bubble.other .message-info {
  align-items: start;
  justify-items: start;
  text-align: left;
}
.message-bubble.own {
  margin-left: auto;
  align-items: flex-end;
}
.message-bubble.other {
  margin-right: auto;
  align-items: flex-start;
}
.message-bubble.own .message-header {
  align-self: flex-end;
  justify-content: flex-end;
}
.message-bubble.other .message-header {
  align-self: flex-start;
}
.message-username,
.message-time {
  display: inline-block;
}
.message-username {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 6px;
}
.message-time {
  font-size: 0.72rem;
  color: var(--muted);
}
.message-bubble.own .message-time {
  align-self: end;
}
.message-content {
  display: inline-block;
  width: fit-content;
  max-width: 70ch;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.95rem;
  line-height: 1.5;
  box-shadow: 0 6px 16px rgba(17, 24, 39, 0.05);
  position: relative;
}
.message-bubble.other .message-content {
  background: var(--accent-50);
  color: var(--text);
  box-shadow: inset 3px 0 0 rgba(37, 99, 235, 0.35);
}
.message-bubble.own .message-content {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: inset -3px 0 0 rgba(16, 185, 129, 0.35);
}
.message-content::before {
  content: "";
  position: absolute;
  top: 10px;
  width: 0;
  height: 0;
  border: 6px solid transparent;
}
.message-bubble.own .message-content::before {
  right: -10px;
  border-left-color: var(--accent-600);
}
.message-bubble.other .message-content::before {
  left: -12px;
  border-right-color: white;
}

/* 打字指示器 */
.typing-indicator {
  display: none;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  margin: 8px auto 12px;
  border-radius: 999px;
}
.typing-dots {
  display: inline-block;
}
.typing-dots span {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 3px;
  background: #c4c8d0;
  border-radius: 50%;
  animation: typing 1.2s infinite ease-in-out;
}

/* 输入区域 */
.input-area {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 10px 12px;
}
.input-container {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
}
.message-input {
  flex: 1;
  padding: 10px 12px;
  border: 2px solid #ddd;
  border-radius: 25px;
  outline: none;
  resize: none;
  min-height: 48px;
  max-height: 100px;
  font-family: inherit;
  transition: border-color 0.3s;
  font-size: 16px;
  background: var(--surface);
  color: var(--text);
}
.message-input::placeholder {
  color: #9aa3af;
}
.message-input {
  scrollbar-width: none;
}
.message-input::-webkit-scrollbar {
  width: 0;
  height: 0;
}
.message-input:focus {
  border-color: var(--accent-500);
}
.emoji-btn,
.send-btn {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  font-size: 18px;
  flex-shrink: 0;
}
.emoji-btn {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
}
.emoji-btn:hover,
.send-btn:hover {
  background: #eaecef;
}
.send-btn {
  background: var(--accent-gradient);
  border: 1px solid var(--accent-600);
  color: #fff;
}
.send-btn:disabled {
  opacity: 1;
  background: #9aa3af;
  border-color: #9aa3af;
  cursor: not-allowed;
}
.send-btn:active {
  transform: scale(0.95);
}

/* 表情选择 */
.emoji-picker {
  position: absolute;
  bottom: 136px;
  left: 92px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 15px;
  display: none;
  z-index: 1000;
  max-height: 200px;
  overflow-y: auto;
}
.emoji-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 8px;
}
.emoji-item {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s;
  font-size: 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.emoji-item:hover,
.emoji-item:active {
  background: var(--accent-50);
}

/* 侧栏 */
.sidebar {
  width: 300px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 98;
  border-left: 1px solid var(--border);
}
.sidebar-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.users-list {
  flex: 1;
  padding: 10px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.user-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 10px;
  margin-bottom: 5px;
  transition: background 0.2s;
  min-height: 48px;
  border: none;
  background: transparent;
}
.user-item:hover {
  background: var(--surface-2);
  box-shadow: inset 3px 0 0 var(--accent-600);
}
.user-item:active {
  background: #f0f0f0;
}
.user-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
}
.controls {
  padding: 15px;
  border-top: 1px solid var(--border);
}
.control-btn {
  width: 100%;
  padding: 12px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 0.9rem;
  min-height: 48px;
  background: var(--surface-2);
  color: var(--text);
}
.control-btn:active {
  transform: scale(0.98);
}
.clear-btn {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}
.clear-btn:active {
  background: #dc2626;
}
.sound-toggle {
  background: #f0f0f0;
  color: #333;
}
.sound-toggle:active {
  background: #e0e0e0;
}
.sound-toggle.active {
  background: var(--accent-gradient);
  border-color: var(--accent-600);
  color: #fff;
}

/* 遮罩层 */
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 97;
}
.mobile-overlay.show {
  display: block;
}

/* 动画 */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes typing {
  0% {
    opacity: 0.4;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(-3px);
  }
  100% {
    opacity: 0.4;
    transform: translateY(0);
  }
}
@keyframes pulse {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
  100% {
    opacity: 1;
  }
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-thumb {
  background: #c4c8d0;
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: #a6abb5;
}
@media (max-width: 768px) {
  ::-webkit-scrollbar {
    width: 0;
    background: transparent;
  }
}

/* 响应式 */
@media (max-width: 768px) {
  body {
    padding: 0;
    overflow: hidden;
  }
  .chat-container {
    height: calc(var(--vh) * 100);
    min-height: 100dvh;
    border-radius: 0;
    max-width: none;
  }
  .header {
    padding: 12px 16px;
  }
  .app-title {
    font-size: 1.1rem;
  }
  .mobile-nav-btn {
    display: flex;
  }
  .user-setup {
    padding: 12px 15px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .user-info {
    min-width: auto;
  }
  .online-users {
    justify-content: center;
    margin-left: 0;
  }
  .main-content {
    flex-direction: row;
  }
  .sidebar {
    position: fixed;
    top: 0;
    right: -280px;
    height: calc(var(--vh) * 100);
    width: 280px;
    z-index: 98;
    transition: right 0.3s ease;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
  }
  .sidebar.open {
    right: 0;
  }
  .chat-area {
    border-right: none;
  }
  .messages-container {
    flex: 0 0 auto;
    max-height: none;
    padding: 12px;
  }
  .message-bubble {
    max-width: 90%;
  }
  .emoji-picker {
    inset: auto 12px 87px;
    width: auto;
    max-height: 180px;
  }
  .emoji-grid {
    grid-template-columns: repeat(8, 1fr);
    gap: 6px;
  }
  .emoji-item {
    width: 32px;
    height: 32px;
    font-size: 18px;
  }
  .message-content {
    font-size: 15px;
    padding: 10px 14px;
  }
  .message-header {
    font-size: 0.7rem;
  }
  .message-time {
    font-size: 0.65rem;
  }
  .typing-indicator {
    font-size: 0.8rem;
    padding: 6px 12px;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.2rem;
  }
  .username-input {
    font-size: 16px;
  }
  .message-input {
    font-size: 16px;
    padding: 10px 14px;
  }
  .emoji-btn,
  .send-btn {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }
  .input-container {
    gap: 8px;
  }
  .sidebar {
    width: 260px;
    right: -260px;
  }
  .emoji-grid {
    grid-template-columns: repeat(7, 1fr);
  }
}

@media (max-width: 768px) and (orientation: landscape) {
  .header {
    padding: 8px 20px;
  }
  .header h1 {
    font-size: 1.1rem;
    margin-bottom: 4px;
  }
  .user-setup {
    padding: 8px 15px;
  }
  .input-area {
    padding: 10px 12px;
  }
}

/* 安全区域适配 */
@supports (padding: max(0px)) {
  .chat-container {
    padding-left: max(0px, env(safe-area-inset-left));
    padding-right: max(0px, env(safe-area-inset-right));
  }
  .input-area {
    padding-bottom: max(15px, env(safe-area-inset-bottom));
  }
}

/* 自己消息气泡配色优化（更柔和、更易读） */
:root {
  --own-bubble-bg: rgba(16, 185, 129, 0.12);
  --own-bubble-border: rgba(16, 185, 129, 0.35);
  --own-bubble-text: var(--text);
}
.message-bubble.own .message-content {
  background: var(--own-bubble-bg);
  color: var(--own-bubble-text);
  box-shadow: inset -3px 0 0 var(--own-bubble-border),
    0 6px 16px rgba(17, 24, 39, 0.05);
}
.message-bubble.own .message-content::before {
  right: -10px;
  border-left-color: var(--own-bubble-border);
}
.message-bubble.own .message-username {
  color: var(--success);
}