:root {
  --bg-server: #202225;
  --bg-channel: #2f3136;
  --bg-chat: #36393f;
  --bg-member: #2f3136;
  --text-normal: #dcddde;
  --text-muted: #8e9297;
  --header-primary: #ffffff;
  --channel-hover: #393c43;
  --accent: #5865F2;
  --accent-hover: #4752C4;
  --input-bg: #40444b;
  --divider: #ffffff0f;
  --danger: #ed4245;
  --success: #23a559;
  --drawer-width: 240px;
}

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

body {
  font-family: Inter, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", system-ui, sans-serif;
  color: var(--text-normal);
  background-color: var(--bg-chat);
  height: 100vh;
  overflow: hidden;
  display: flex;
}

.discord-app {
  display: flex;
  width: 100%;
  height: 100%;
}

/* Column 1: Server List */
.server-list {
  width: 72px;
  background-color: var(--bg-server);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 0;
  gap: 8px;
  overflow-y: auto;
  flex-shrink: 0;
}

.server-icon {
  width: 48px;
  height: 48px;
  background-color: #36393f;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: border-radius 0.2s ease, background-color 0.2s ease, transform 0.15s ease;
  position: relative;
  color: var(--text-normal);
}

.server-icon:hover {
  border-radius: 16px;
  background-color: var(--accent);
  color: white;
}

.server-icon.active {
  border-radius: 16px;
  background-color: var(--accent);
  color: white;
}

.server-icon:active { transform: scale(0.95); }

.server-icon::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 0;
  background: white;
  border-radius: 0 4px 4px 0;
  transition: height 0.2s ease;
}

.server-icon:hover::before { height: 20px; }
.server-icon.active::before { height: 40px; }

.server-icon.unread::after {
  content: '';
  position: absolute;
  right: -2px;
  top: -2px;
  width: 10px;
  height: 10px;
  background: white;
  border-radius: 50%;
  border: 3px solid var(--bg-server);
}

.server-separator {
  width: 32px;
  height: 2px;
  background-color: var(--divider);
  margin: 4px 0;
}

/* Column 2: Channel List */
.channel-list {
  width: var(--drawer-width);
  background-color: var(--bg-channel);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.channel-header {
  height: 48px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--bg-server);
  font-weight: 600;
  color: var(--header-primary);
  cursor: pointer;
  transition: background-color 0.2s;
}

.channel-header:hover { background-color: var(--channel-hover); }

.channels-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 16px 8px;
}

.category {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
}

.category:hover { color: var(--text-normal); }

.channel {
  padding: 6px 8px;
  margin-bottom: 2px;
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 16px;
  font-weight: 500;
  transition: background-color 0.2s, color 0.2s;
  position: relative;
}

.channel:hover {
  background-color: var(--channel-hover);
  color: var(--text-normal);
}

.channel.active {
  background-color: #393c43;
  color: var(--header-primary);
}

.channel.unread {
  color: var(--header-primary);
  font-weight: 600;
}

.channel.unread::before {
  content: '';
  position: absolute;
  left: 0;
  width: 4px;
  height: 8px;
  background: white;
  border-radius: 0 2px 2px 0;
}

.channel .unread-badge {
  margin-left: auto;
  min-width: 8px;
  height: 8px;
  background: var(--danger);
  border-radius: 50%;
  flex-shrink: 0;
}

.user-section {
  height: 52px;
  background-color: #292b2f;
  display: flex;
  align-items: center;
  padding: 0 8px;
  gap: 8px;
}

.avatar-wrapper { position: relative; }

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #f2f3f5;
}

.status-dot {
  width: 10px;
  height: 10px;
  background-color: var(--success);
  border-radius: 50%;
  position: absolute;
  bottom: -2px;
  right: -2px;
  border: 3px solid #292b2f;
}

.status-dot.offline { background-color: #747f8d; }

.user-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: white;
  outline: none;
  background: transparent;
  border: none;
  width: 100%;
}

.user-id { font-size: 12px; color: var(--text-muted); }

.user-controls { display: flex; gap: 4px; }

.user-btn {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: background-color 0.2s;
  color: var(--text-normal);
}

.user-btn:hover { background-color: var(--channel-hover); }

/* Column 3: Chat Area */
.chat-area {
  flex: 1;
  background-color: var(--bg-chat);
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  touch-action: pan-y;
}

.chat-header {
  height: 48px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--bg-server);
  flex-shrink: 0;
}

.chat-title {
  font-size: 16px;
  font-weight: 600;
  color: white;
  display: flex;
  gap: 8px;
  align-items: center;
}

.chat-title span { color: var(--text-muted); font-size: 24px; font-weight: 400; }

.chat-tools { display: flex; gap: 16px; align-items: center; color: var(--text-muted); }

.search-bar {
  background-color: var(--bg-server);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 14px;
  width: 144px;
  display: flex;
  justify-content: space-between;
}

.messages-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  user-select: text;
  -webkit-user-select: text;
}

.date-divider {
  display: flex;
  align-items: center;
  margin: 16px 16px 8px;
  gap: 12px;
}

.date-divider::before,
.date-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--divider);
}

.date-divider span {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.message {
  padding: 4px 48px 4px 16px;
  display: flex;
  gap: 16px;
  margin-top: 4px;
  position: relative;
}

.message.grouped { margin-top: 0; padding-top: 2px; }
.message.grouped .msg-avatar { visibility: hidden; }
.message.grouped .msg-header { display: none; }

.message:hover { background-color: var(--divider); }

.msg-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.msg-content-wrapper { flex: 1; min-width: 0; }

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

.msg-author {
  font-weight: 500;
  color: white;
  font-size: 16px;
  cursor: pointer;
}

.msg-author:hover { text-decoration: underline; }

.msg-time { font-size: 12px; color: var(--text-muted); }
.msg-edited { font-size: 10px; color: var(--text-muted); margin-left: 4px; }

.msg-content {
  font-size: 16px;
  color: var(--text-normal);
  line-height: 1.375rem;
  word-wrap: break-word;
  user-select: text;
  -webkit-user-select: text;
  cursor: text;
}

.msg-content strong { font-weight: 700; color: var(--header-primary); }
.msg-content em { font-style: italic; }
.msg-content code {
  background: #2b2d31;
  padding: 2px 4px;
  border-radius: 3px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
}

.msg-content pre {
  background: #2b2d31;
  border: 1px solid var(--divider);
  border-radius: 4px;
  padding: 8px;
  margin: 4px 0;
  overflow-x: auto;
}

.msg-content pre code {
  background: none;
  padding: 0;
  font-size: 13px;
  white-space: pre;
}

.message.deleted .msg-content { opacity: 0.5; font-style: italic; }

.reply-preview {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  padding-left: 8px;
  border-left: 3px solid var(--text-muted);
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
}

.reply-preview:hover { color: var(--text-normal); }
.reply-preview .reply-author { color: var(--accent); font-weight: 500; }

.msg-actions {
  position: absolute;
  right: 16px;
  top: -12px;
  background-color: var(--bg-chat);
  border: 1px solid var(--divider);
  border-radius: 4px;
  display: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

.message:hover .msg-actions { display: flex; }

.msg-action-btn {
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 14px;
  min-width: 32px;
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s, color 0.15s;
}

.msg-action-btn:hover { background-color: var(--channel-hover); color: var(--text-normal); }
.msg-action-btn.delete:hover { color: var(--danger); }

.reactions-zone { display: flex; gap: 4px; margin-top: 4px; flex-wrap: wrap; }

.reaction-btn {
  background: var(--channel-hover);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 2px 6px;
  font-size: 14px;
  color: var(--text-normal);
  cursor: pointer;
}

.reaction-btn:hover { border-color: var(--text-muted); }

.emoji-picker-btn {
  background: none;
  border: 1px dashed var(--divider);
  border-radius: 8px;
  padding: 2px 6px;
  cursor: pointer;
  color: var(--text-normal);
}

.emoji-picker-btn:hover { border-color: var(--text-muted); }

/* Composer */
.chat-input-wrapper {
  padding: 0 16px 16px;
  flex-shrink: 0;
  width: 100%;
}

.reply-bar {
  display: none;
  align-items: center;
  justify-content: space-between;
  background: var(--input-bg);
  border-radius: 8px 8px 0 0;
  padding: 8px 12px;
  margin: 0 0 -4px;
  border-left: 4px solid var(--accent);
  font-size: 13px;
}

.reply-bar.active { display: flex; }
.reply-bar-text { color: var(--text-muted); }
.reply-bar-text strong { color: var(--header-primary); }
.reply-bar-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 8px;
  border-radius: 4px;
}

.reply-bar-close:hover { color: var(--text-normal); background: var(--channel-hover); }

.chat-input-box {
  background-color: var(--input-bg);
  border-radius: 8px;
  display: flex;
  align-items: flex-end;
  padding: 10px 12px;
  gap: 10px;
  min-height: 44px;
  width: 100%;
}

#composer { display: flex; flex-direction: column; width: 100%; }

.attach-btn,
.emoji-input-btn {
  background: #b9bbbe;
  color: var(--input-bg);
  width: 32px;
  height: 32px;
  min-width: 32px;
  min-height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  cursor: pointer;
  border: none;
  font-size: 18px;
  flex-shrink: 0;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  padding: 0;
  transition: background 0.15s, transform 0.1s;
}

.attach-btn:active,
.emoji-input-btn:active,
.send-btn:active { transform: scale(0.92); }

.attach-btn:hover,
.emoji-input-btn:hover { background: #dcddde; }

#messageInput {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-normal);
  font-size: 16px;
  outline: none;
  min-height: 24px;
  min-width: 0;
  resize: none;
  padding: 4px 0;
  line-height: 1.375;
  max-height: 200px;
}

#messageInput::placeholder { color: var(--text-muted); }

.send-btn {
  background: transparent;
  border: none;
  color: var(--accent);
  font-size: 20px;
  cursor: pointer;
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  padding: 0;
  transition: color 0.2s, transform 0.1s, opacity 0.2s;
}

.send-btn:hover:not(:disabled) { 
  color: var(--accent-hover); 
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  color: var(--text-muted);
}

.status-bar {
  padding-top: 4px;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
}

.char-counter {
  font-size: 11px;
  color: var(--text-muted);
  transition: color 0.2s;
}

.char-counter.caution {
  color: #faa61a;
}

.char-counter.warning {
  color: var(--danger);
  font-weight: 600;
}

.file-preview {
  margin-bottom: 8px;
  background: var(--input-bg);
  border: 1px solid var(--divider);
  border-radius: 8px;
  padding: 12px;
  animation: slide-in 0.2s ease;
}

.preview-content {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.preview-icon {
  font-size: 20px;
  flex-shrink: 0;
}

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

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

.preview-size {
  font-size: 11px;
  color: var(--text-muted);
}

.preview-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all 0.15s;
  flex-shrink: 0;
}

.preview-close:hover {
  color: var(--text-normal);
  background: var(--channel-hover);
}

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

/* Emoji Picker */
.emoji-picker {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 0;
  margin-bottom: 8px;
  background: var(--bg-channel);
  border: 1px solid var(--divider);
  border-radius: 8px;
  padding: 8px;
  width: 320px;
  max-height: 280px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.emoji-picker.active { display: block; }

.emoji-picker-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
}

.emoji-picker-item {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  border-radius: 4px;
  border: none;
  background: transparent;
  transition: background 0.15s;
}

.emoji-picker-item:hover { background: var(--channel-hover); }

.emoji-picker-anchor { position: relative; }

/* Column 4: Member List */
.member-list {
  width: 240px;
  background-color: var(--bg-member);
  padding: 16px 8px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  flex-shrink: 0;
}

.member-group {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.member {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.member:hover { background-color: var(--channel-hover); }

.member-avatar { position: relative; flex-shrink: 0; }
.member-avatar .avatar { width: 32px; height: 32px; }

.member-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.member:hover .member-name { color: var(--text-normal); }
.member.offline .member-name { color: #6d7178; }

.attachment-img {
  max-width: 400px;
  max-height: 300px;
  border-radius: 8px;
  margin-top: 8px;
  display: block;
}

.attachment-link { color: #00aff4; text-decoration: none; }
.attachment-link:hover { text-decoration: underline; }

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 400px;
  padding: 12px 16px;
  border-radius: 8px;
  background: #18191c;
  border-left: 4px solid var(--accent);
  color: var(--text-normal);
  font-size: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  animation: toast-in 0.3s ease;
}

.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }
.toast.warning { border-left-color: #faa61a; }

.toast-icon { font-size: 18px; flex-shrink: 0; }
.toast-body { flex: 1; }
.toast-title { font-weight: 600; color: white; margin-bottom: 2px; }
.toast-message { color: var(--text-muted); font-size: 13px; }

@keyframes toast-in {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Mobile */
.mobile-menu-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 20px;
  padding: 0;
  display: none;
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
  touch-action: manipulation;
}

.mobile-menu-btn:hover { color: var(--text-normal); }

.mobile-menu {
  display: none;
  position: fixed;
  top: 48px;
  right: 12px;
  background: var(--bg-chat);
  border: 1px solid var(--divider);
  border-radius: 8px;
  z-index: 1001;
  min-width: 180px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.mobile-menu.active { display: block; }

.mobile-menu-item {
  padding: 12px 16px;
  cursor: pointer;
  color: var(--text-normal);
  font-size: 14px;
  border-bottom: 1px solid var(--divider);
  transition: background-color 0.2s;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.mobile-menu-item:last-child { border-bottom: none; }
.mobile-menu-item:hover { background-color: var(--channel-hover); }

.channel-drawer-toggle {
  display: none;
  position: fixed;
  top: 10px;
  left: 68px;
  z-index: 1002;
  background: var(--bg-server);
  border: none;
  color: var(--text-normal);
  font-size: 22px;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  transition: background 0.2s;
}

.channel-drawer-toggle:hover { background: var(--channel-hover); }

.channel-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0);
  z-index: 998;
  transition: background 0.3s ease;
  pointer-events: none;
}

.channel-overlay.active {
  display: block;
  background: rgba(0, 0, 0, 0.55);
  pointer-events: auto;
}

.member-drawer {
  display: none;
  position: fixed;
  right: -260px;
  top: 0;
  width: 260px;
  height: 100vh;
  z-index: 999;
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -4px 0 16px rgba(0,0,0,0.3);
}

.member-drawer.open { right: 0; }

@media (max-width: 1200px) {
  .member-list { width: 200px; }
  .channel-list { width: 220px; }
}

@media (max-width: 768px) {
  .server-list { width: 60px; }
  .server-icon { width: 44px; height: 44px; }
  .channel-list {
    position: fixed;
    left: 60px;
    top: 0;
    height: 100vh;
    z-index: 999;
    transform: translateX(calc(-1 * var(--drawer-width) - 60px));
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
  }
  .channel-list.drawer-open { transform: translateX(0); }
  .member-list { display: none; }
  .member-drawer { display: flex; flex-direction: column; }
  .channel-drawer-toggle { display: flex; }
  .chat-tools { display: none; }
  .mobile-menu-btn { display: flex; }
  .search-bar { display: none; }
  .message { padding: 4px 12px 4px 12px; }
  .msg-actions { right: 8px; }
  .toast-container { left: 12px; right: 12px; bottom: 80px; }
  .toast { min-width: auto; max-width: none; }
  .emoji-picker { width: calc(100vw - 32px); left: 0; }
}

@media (max-width: 480px) {
  .server-list { width: 52px; padding: 8px 0; }
  .server-icon { width: 40px; height: 40px; }
  .channel-drawer-toggle { left: 56px; width: 36px; height: 36px; font-size: 18px; }
  .channel-list { left: 52px; }
  .chat-header { height: 44px; padding: 0 8px; }
  .chat-title { font-size: 14px; }
  .attach-btn, .emoji-input-btn { width: 36px; height: 36px; min-width: 36px; min-height: 36px; }
  .send-btn { width: 44px; height: 44px; min-width: 44px; min-height: 44px; }
}