:root {
  --bg-primary: #313338;
  --bg-secondary: #2b2d31;
  --bg-tertiary: #1e1f22;
  --text-primary: #f2f3f5;
  --text-secondary: #b5bac1;
  --text-muted: #949ba4;
  --accent: #c15421;
  --accent-hover: #c47a2e;
  --border: #3f4147;
}

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

html, body {
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  position: fixed;
  width: 100%;
}

.hidden {
  display: none !important;
}

/* Username Modal */
#username-modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
}

#username-form {
  background: var(--bg-secondary);
  padding: 32px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 360px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

#username-form h2 {
  text-align: center;
  font-size: 20px;
  font-weight: 600;
}

#username-form input {
  padding: 10px 12px;
  border-radius: 4px;
  border: none;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
}

#username-form input:focus {
  box-shadow: 0 0 0 2px var(--accent);
}

#username-form button {
  padding: 10px;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

#username-form button:hover {
  background: var(--accent-hover);
}

/* Chat Container */
#chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#chat-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--bg-tertiary);
  font-weight: 600;
  font-size: 16px;
  flex-shrink: 0;
}

#status-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ed4245;
}

#status-indicator.connected {
  background: #57f287;
}

/* Settings */
#settings-wrapper {
  position: relative;
  margin-left: auto;
}

#settings-button {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}

#settings-button:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

#settings-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  min-width: 160px;
  z-index: 50;
}

#settings-dropdown button {
  display: block;
  width: 100%;
  padding: 10px 12px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}

#settings-dropdown button:hover {
  background: var(--accent);
  border-radius: 4px;
}

/* Messages */
#messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#messages::-webkit-scrollbar {
  width: 8px;
}

#messages::-webkit-scrollbar-track {
  background: transparent;
}

#messages::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

.message {
  padding: 4px 0;
  line-height: 1.4;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.message .username {
  font-weight: 600;
  flex-shrink: 0;
}

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

.message .text {
  word-break: break-word;
}

.message-media {
  display: block;
  max-width: 300px;
  max-height: 300px;
  border-radius: 4px;
  margin-top: 4px;
  cursor: pointer;
}

.message-media:hover {
  opacity: 0.9;
}

.message-file {
  display: inline-block;
  margin-top: 4px;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  color: var(--accent);
  text-decoration: none;
  font-size: 14px;
}

.message-file::before {
  content: '\1F4CE ';
}

.message-file:hover {
  text-decoration: underline;
}

.message .timestamp {
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.system-message {
  padding: 4px 0;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  font-size: 13px;
}

/* Attachment Preview */
#attachment-preview {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  overflow-x: auto;
  flex-shrink: 0;
}

.attachment-thumb {
  position: relative;
  flex-shrink: 0;
  width: 120px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.attachment-thumb img,
.attachment-thumb video {
  width: 120px;
  height: 80px;
  object-fit: cover;
  display: block;
}

.attachment-thumb .thumb-name {
  padding: 4px 6px;
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.attachment-thumb .thumb-remove {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: var(--text-primary);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.attachment-thumb .thumb-remove:hover {
  background: #ed4245;
}

.attachment-thumb .thumb-file-icon {
  width: 120px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--text-muted);
}

/* Input Bar */
#upload-button {
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 22px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

#upload-button:hover {
  color: var(--text-primary);
  background: var(--border);
}

#input-bar {
  display: flex;
  gap: 8px;
  padding: 16px;
  background: var(--bg-tertiary);
  flex-shrink: 0;
  align-items: center;
}

/* Upload Modal */
#upload-modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
}

#upload-modal-content {
  background: var(--bg-secondary);
  padding: 24px;
  border-radius: 8px;
  width: 400px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

#drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  color: var(--text-secondary);
}

#drop-zone:hover,
#drop-zone.drag-over {
  border-color: var(--accent);
  color: var(--text-primary);
  background: rgba(193, 84, 33, 0.1);
}

.drop-zone-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}

#file-input {
  display: none;
}

#upload-modal-close {
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  align-self: flex-end;
}

#upload-modal-close:hover {
  color: var(--text-primary);
}

#message-input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 4px;
  border: none;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 16px;
  outline: none;
}

#message-input:focus {
  box-shadow: 0 0 0 2px var(--accent);
}

#send-button {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
}

#send-button:hover {
  background: var(--accent-hover);
}

#send-button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

#send-button .spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}