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

body {
  background: #222;
  color: #eee;
  height: 100vh;
}

body, input, select, button, textarea {
  padding: .5em;
  font-family: monospace;
  font-size: 1em;
  line-height: 1.5;
  color: #eee;
}

h1, h2, h3, h4, h5 {
  font-size: 1em;
}

button, select, textarea {
  border: 1px solid #444;
  background: #333;
  outline: none;
}

button:hover, select:hover, input:hover, textarea:hover {
  border-color: #666;
}

button {
  cursor: pointer;
  line-height: 1.25;
  padding: .5em .75em;
}

textarea {
  height: 8em;
  min-height: 8em;
}

.toggle {
  display: flex;
  align-items: center;
  gap: .5em;
  margin-left: auto;
}

.toggle label {
  cursor: pointer;
}

.session-rename {
  background: #222;
  border: 1px solid #888;
  outline: none;
}

/* ── Header ── */

header {
  padding: 1em 2em;
  border-bottom: 1px solid #444;
  display: flex;
  align-items: center;
  gap: 1em;
  flex-shrink: 0;
}

/* ── System Prompt ── */

#systemPrompt {
  display: none;
  width: calc(100% - 2em);
  margin: 1em;
  padding: 1em;
}

#systemPrompt.visible { display: block; }

/* ── Meta Bar ── */

.meta-bar {
  padding: .5em;
  background: #111;
  border-bottom: 1px solid #333;
  flex-shrink: 0;
  min-height: 2.5em;
}

/* ── Chat ── */

#chat {
  flex: 1;
  overflow-y: auto;
  padding: 1em;
  display: flex;
  flex-direction: column;
  gap: 1em;
}

.msg {
  max-width: 85%;
  padding: 1em;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg.user {
  align-self: flex-end;
  background: #333;
  border: 1px solid #444;
}

.msg.assistant {
  align-self: flex-start;
  background: #111;
  border: 1px solid #333;
}

.msg.system-info {
  align-self: center;
  border: 1px solid #444;
  text-align: center;
}

/* ── Cursor ── */

.msg .cursor {
  display: inline-block;
  width: .125em;
  height: 1em;
  background: #fff;
  animation: blink 0.8s infinite;
  vertical-align: text-bottom;
  margin-left: .125em;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ── Tool Boxes ── */

.tool-box {
  align-self: center;
  padding: .5em;
  background: #333;
  border: 1px solid #444;
}

/* ── Input Area ── */

.input-area {
  border-top: 1px solid #333;
  display: flex;
  flex-shrink: 0;
  gap: 1em;
  padding: 1em;
}

.input-area textarea {
  flex: 1;
}

.input-area button {
  align-self: flex-end;
}

.input-area button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Archive ── */

.archive-container {
  display: flex;
  flex-direction: column;
  gap: 1em;
}

.archived { opacity: 0.6; }

.archive-load-btn {
  display: block;
  margin-inline: auto;
}