/* Glyph AI — black and white, ChatGPT-style */
* { box-sizing: border-box; }
:root {
  --bg: #fff;
  --bg-elevated: #fafafa;
  --fg: #111;
  --fg-muted: #666;
  --border: #e5e5e5;
  --border-strong: #000;
  --accent: #000;
  --accent-hover: #333;
  --user-bg: #000;
  --user-fg: #fff;
  --assistant-bg: #fff;
  --assistant-fg: #111;
  --system-bg: #f5f5f5;
  --system-fg: #666;
  --input-bg: #fff;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 150ms ease;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --bg-elevated: #1a1a1a;
    --fg: #eee;
    --fg-muted: #888;
    --border: #333;
    --border-strong: #fff;
    --accent: #fff;
    --accent-hover: #ddd;
    --user-bg: #fff;
    --user-fg: #111;
    --assistant-bg: #1a1a1a;
    --assistant-fg: #eee;
    --system-bg: #1a1a1a;
    --system-fg: #888;
    --input-bg: #1a1a1a;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  }
}

html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

/* Setup Overlay */
.setup-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}
.setup-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 40px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow);
}
.setup-logo { margin-bottom: 16px; color: var(--fg); }
.setup-title {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--fg);
}
.setup-subtitle {
  margin: 0 0 24px;
  color: var(--fg-muted);
  font-size: 15px;
}
.setup-progress-wrap {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 16px;
}
.setup-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 300ms ease;
}
.setup-status {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  min-height: 40px;
}
.setup-step { font-weight: 600; color: var(--fg); }
.setup-detail { color: var(--fg-muted); }
.setup-skip {
  margin-top: 24px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: all var(--transition);
}
.setup-skip:hover { border-color: var(--border-strong); color: var(--fg); }

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
  flex-shrink: 0;
}
.brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo { color: var(--fg); flex-shrink: 0; }
.brand {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.3px;
  color: var(--fg);
}
.modelrow { display: flex; align-items: center; gap: 12px; }
#modelSelect {
  appearance: none;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 36px 8px 14px;
  font-size: 14px;
  color: var(--fg);
  cursor: pointer;
  min-width: 180px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}
#modelSelect:focus { outline: none; border-color: var(--accent); }
#newChatBtn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--fg);
  cursor: pointer;
  transition: all var(--transition);
}
#newChatBtn:hover { background: var(--border); border-color: var(--border-strong); }
#newChatBtn:active { transform: scale(0.96); }
#newChatBtn svg { width: 18px; height: 18px; }

/* Status & Progress */
.status {
  padding: 10px 24px;
  font-size: 13px;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  min-height: 38px;
  flex-shrink: 0;
}
.progress-wrap {
  height: 3px;
  background: var(--border);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 200ms ease;
}

/* Chat Area */
.chat {
  flex: 1;
  overflow-y: auto;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}
.msg {
  max-width: 85%;
  padding: 14px 18px;
  border-radius: var(--radius);
  line-height: 1.65;
  white-space: pre-wrap;
  word-wrap: break-word;
  animation: fadeIn 200ms ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.msg.user {
  align-self: flex-end;
  background: var(--user-bg);
  color: var(--user-fg);
  border-radius: var(--radius) var(--radius) 4px var(--radius);
}
.msg.ai {
  align-self: flex-start;
  background: var(--assistant-bg);
  color: var(--assistant-fg);
  border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) var(--radius) 4px;
}
.msg.system {
  align-self: center;
  max-width: 90%;
  background: var(--system-bg);
  color: var(--system-fg);
  border: 1px dashed var(--border);
  font-size: 13px;
  text-align: center;
  padding: 10px 16px;
}

/* Hardware Info */
.hw-info {
  padding: 8px 24px;
  font-size: 12px;
  color: var(--fg-muted);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

/* Composer */
.composer {
  display: flex;
  gap: 12px;
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}
.input-wrap { flex: 1; }
#input {
  width: 100%;
  min-height: 48px;
  max-height: 200px;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--input-bg);
  color: var(--fg);
  font: inherit;
  font-size: 15px;
  line-height: 1.6;
  resize: none;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
#input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,0,0,0.1); }
#input::placeholder { color: var(--fg-muted); }
#input:disabled { background: var(--bg-elevated); color: var(--fg-muted); cursor: not-allowed; }
@media (prefers-color-scheme: dark) {
  #input:focus { box-shadow: 0 0 0 3px rgba(255,255,255,0.1); }
}
#sendBtn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
}
#sendBtn:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); transform: translateY(-1px); }
#sendBtn:active:not(:disabled) { transform: scale(0.98); }
#sendBtn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
#sendBtn svg { width: 20px; height: 20px; }

/* Scrollbar */
* { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
*::-webkit-scrollbar-thumb:hover { background: var(--fg-muted); }

/* Selection */
::selection { background: var(--accent); color: var(--bg); }

/* Mobile */
@media (max-width: 640px) {
  .topbar { padding: 0 16px; height: 56px; }
  .brand { font-size: 18px; }
  #modelSelect { min-width: 140px; padding: 8px 32px 8px 12px; }
  .chat { padding: 24px 16px; gap: 16px; }
  .composer { padding: 16px; gap: 8px; }
  #input { min-height: 44px; padding: 10px 14px; font-size: 16px; }
  #sendBtn { width: 44px; height: 44px; }
  .setup-card { padding: 32px 24px; margin: 16px; }
}