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

:root {
  --bg: #0a0e14;
  --bg-panel: #0d1117;
  --bg-input: #0d1117;
  --bg-tab: #161b22;
  --bg-tab-active: #0d1117;
  --bg-topic: #0d1117;
  --text: #c9d1d9;
  --text-dim: #6e7681;
  --text-bright: #e6edf3;
  --accent: #58a6ff;
  --accent-dim: #1f6feb;
  --border: #21262d;
  --system: #7d8590;
  --action: #d2a8ff;
  --warn: #d29922;
  --error: #f85149;
  --unread: #f0883e;
  --nick-brackets: #6e7681;
  --timestamp: #484f58;
  --input-bg: #161b22;
  --prompt: #3fb950;
  --tab-indicator: #58a6ff;
  --user-list-bg: #0d1117;
  --user-list-header: #484f58;
}

html,
body,
#root {
  height: 100%;
  font-family: "JetBrains Mono", "Cascadia Code", "Fira Code", "SF Mono",
    "Consolas", "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

/* ============================================
   Login Screen
   ============================================ */

.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  background: var(--bg);
}

.login-box {
  text-align: center;
  max-width: 360px;
  width: 100%;
  padding: 32px;
}

.login-box h1 {
  color: var(--accent);
  font-size: 1.8em;
  margin-bottom: 16px;
  font-weight: 400;
}

.login-box .motd {
  color: var(--text-dim);
  font-size: 12px;
  margin-bottom: 20px;
  text-align: left;
  white-space: pre-wrap;
  font-family: inherit;
  border-left: 2px solid var(--border);
  padding-left: 12px;
}

.login-box form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
}

.login-box label {
  color: var(--text-dim);
  text-align: left;
  font-size: 12px;
}

.login-box input {
  padding: 8px 12px;
  font-family: inherit;
  font-size: 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text-bright);
  border-radius: 3px;
  outline: none;
}

.login-box input:focus {
  border-color: var(--accent-dim);
}

.login-box button {
  padding: 8px 16px;
  font-family: inherit;
  font-size: 14px;
  background: var(--accent-dim);
  border: none;
  color: var(--text-bright);
  border-radius: 3px;
  cursor: pointer;
  margin-top: 4px;
}

.login-box button:hover {
  background: var(--accent);
}

.login-box .error {
  color: var(--error);
  font-size: 12px;
  margin-top: 8px;
}

/* ============================================
   IRC App Layout
   ============================================ */

.irc-app {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

/* ============================================
   Tab Bar
   ============================================ */

.tab-bar {
  display: flex;
  background: var(--bg-tab);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  height: 32px;
  align-items: stretch;
}

.tabs {
  display: flex;
  overflow-x: auto;
  flex: 1;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  display: flex;
  align-items: center;
  padding: 0 12px;
  cursor: pointer;
  color: var(--text-dim);
  white-space: nowrap;
  user-select: none;
  border-right: 1px solid var(--border);
  font-size: 12px;
  gap: 4px;
  position: relative;
}

.tab:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.tab.active {
  color: var(--text-bright);
  background: var(--bg-tab-active);
  border-bottom: 2px solid var(--tab-indicator);
  margin-bottom: -1px;
}

.tab.has-unread .tab-label {
  color: var(--unread);
  font-weight: bold;
}

.tab .unread-count {
  color: var(--unread);
  font-size: 11px;
  font-weight: bold;
}

.tab-close {
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1;
  margin-left: 2px;
}

.tab-close:hover {
  color: var(--error);
}

.status-area {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  flex-shrink: 0;
  font-size: 12px;
}

.status-nick {
  color: var(--accent);
  font-weight: bold;
}

.status-warn {
  color: var(--warn);
  animation: blink 1.5s ease-in-out infinite;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

/* ============================================
   Topic Bar
   ============================================ */

.topic-bar {
  padding: 4px 12px;
  background: var(--bg-topic);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 0;
  line-height: 1.5;
}

.topic-label {
  color: var(--text-dim);
}

.topic-text {
  color: var(--text);
}

/* ============================================
   Main Content Area
   ============================================ */

.main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* ============================================
   Messages Panel
   ============================================ */

.messages-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.messages-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.messages-scroll::-webkit-scrollbar {
  width: 8px;
}

.messages-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.messages-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* ============================================
   Message Lines
   ============================================ */

.message {
  padding: 1px 0;
  line-height: 1.4;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-size: 13px;
}

.message .timestamp {
  color: var(--timestamp);
  font-size: 12px;
}

.message .nick {
  font-weight: bold;
}

.message .content {
  color: var(--text);
}

/* System messages (joins, parts, quits, etc.) */
.system-message {
  color: var(--system);
}

.system-message .system-text {
  color: var(--system);
}

/* /me action messages */
.action-message .action-text {
  color: var(--action);
}

/* ============================================
   User List (Right Panel)
   ============================================ */

.user-list {
  width: 160px;
  background: var(--user-list-bg);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.user-list-header {
  padding: 6px 10px;
  color: var(--user-list-header);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.user-list-entries {
  overflow-y: auto;
  padding: 4px 0;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.nick-entry {
  padding: 2px 10px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.5;
}

.nick-entry:hover {
  background: rgba(255, 255, 255, 0.04);
}

.nick-prefix {
  color: var(--text-dim);
  display: inline-block;
  width: 1ch;
  text-align: right;
  margin-right: 1px;
}

.nick-name {
  font-weight: normal;
}

/* ============================================
   Input Line (Bottom)
   ============================================ */

.input-line {
  display: flex;
  align-items: center;
  background: var(--input-bg);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  height: 36px;
  padding: 0 8px;
  gap: 6px;
}

.input-prompt {
  color: var(--prompt);
  font-size: 13px;
  flex-shrink: 0;
  white-space: nowrap;
}

.input-line input {
  flex: 1;
  padding: 4px 0;
  font-family: inherit;
  font-size: 13px;
  background: transparent;
  border: none;
  color: var(--text-bright);
  outline: none;
  caret-color: var(--accent);
}

.input-line input::placeholder {
  color: var(--text-dim);
  font-style: italic;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
  .user-list {
    display: none;
  }

  .tab {
    padding: 0 8px;
    font-size: 11px;
  }

  .input-prompt {
    font-size: 12px;
  }
}