@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@300;400;500&family=DM+Sans:wght@300;400&display=swap');

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

:root {
  --bg: #f5f4f0;
  --fg: #1a1a1a;
  --muted: #888;
  --border: #d8d7d3;
  --err: #c0392b;
}

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#lock {
  width: 100%;
  max-width: 340px;
  padding: 0 24px;
  animation: fadeIn 0.4s ease;
}

#lock h1 {
  font-family: 'DM Mono', monospace;
  font-weight: 400;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  margin-bottom: 40px;
}

#lock label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
  font-family: 'DM Mono', monospace;
}

#pw-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
  font-family: 'DM Mono', monospace;
  font-size: 0.95rem;
  color: var(--fg);
  outline: none;
  transition: border-color 0.2s;
  letter-spacing: 0.15em;
}

#pw-input:focus { border-color: var(--fg); }

#pw-btn {
  margin-top: 28px;
  width: 100%;
  padding: 12px;
  background: var(--fg);
  color: var(--bg);
  border: none;
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: opacity 0.15s;
}

#pw-btn:hover { opacity: 0.8; }

#err-msg {
  margin-top: 14px;
  font-size: 0.75rem;
  color: var(--err);
  font-family: 'DM Mono', monospace;
  min-height: 18px;
  letter-spacing: 0.05em;
}

#app {
  display: none;
  width: 100%;
  max-width: 680px;
  height: 100vh;
  flex-direction: column;
  padding: 32px 24px 24px;
}

#app.visible { display: flex; animation: fadeIn 0.4s ease; }

#app-header {
  display: flex;
  align-items: baseline;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

#app-header h1 {
  font-family: 'DM Mono', monospace;
  font-weight: 400;
  font-size: 1rem;
  letter-spacing: 0.08em;
}

#messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.msg {
  display: flex;
  gap: 14px;
  animation: fadeIn 0.3s ease;
}

.msg-role {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  min-width: 48px;
  padding-top: 2px;
}

.msg-role.you { color: var(--fg); }

.msg-body {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--fg);
  white-space: pre-wrap;
}

.thinking { opacity: 0.4; font-style: italic; }

#input-row {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

#model-select {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 10px;
  height: 32px;
  align-self: flex-end;
  outline: none;
}

#model-select:focus {
  border-color: var(--fg);
  color: var(--fg);
}

#chat-input {
  flex: 1;
  background: transparent;
  border: none;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  color: var(--fg);
  outline: none;
  resize: none;
  height: 40px;
  line-height: 1.5;
}

#send-btn {
  background: transparent;
  border: 1px solid var(--border);
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.15s;
  align-self: flex-end;
}

#send-btn:hover { border-color: var(--fg); color: var(--fg); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 720px) {
  #app {
    padding: 24px 16px 16px;
    height: 100vh;
  }

  #lock {
    max-width: 100%;
  }
}