:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #11172b;
  --panel-2: #151d36;
  --text: #edf2ff;
  --muted: #9bacd0;
  --accent: #6ea8fe;
  --border: #26314f;
  --user: #1c3a66;
  --assistant: #1a243f;
  --content-max: 1600px;
}

* { box-sizing: border-box; }
html {
  min-height: 100%;
  font-size: 18px;
}
body {
  min-height: 100%;
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
}
.app {
  display: grid;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  min-height: 100vh;
  max-width: var(--content-max);
  margin: 0 auto;
}
.sidebar, .main { padding: 24px; }
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}
.main {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  min-height: 100vh;
}
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.chat-header-main {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.chat-header h2,
.sidebar h1 {
  margin: 0;
}
.sidebar h1 {
  font-size: 1.6rem;
}
.chat-header h2 {
  font-size: 1.45rem;
}
.typing {
  color: var(--muted);
  font-size: 0.95rem;
}
.hidden { display: none; }
.mobile-only { display: none; }
.icon-btn {
  width: 44px;
  min-width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 12px;
  font-size: 20px;
  line-height: 1;
}
label {
  display: block;
  margin-bottom: 14px;
  font-size: 0.98rem;
}
.hint {
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: -6px;
  margin-bottom: 12px;
  overflow-wrap: anywhere;
}
code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 6px;
}
input, button, select {
  width: 100%;
  max-width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 14px 16px;
  margin-top: 6px;
  font-size: 1rem;
}
button {
  background: var(--accent);
  color: #08101f;
  font-weight: 700;
  cursor: pointer;
}
button.secondary {
  background: transparent;
  color: var(--text);
}
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
button:hover:not(:disabled) { filter: brightness(1.05); }
.status, .box {
  margin-top: 12px;
  padding: 14px;
  border-radius: 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 0.98rem;
}
.box {
  white-space: pre-wrap;
  min-height: 120px;
  overflow-wrap: anywhere;
}
.messages {
  flex: 1;
  min-height: 320px;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 18px;
  padding: 18px;
  overflow: auto;
}
.message {
  margin-bottom: 14px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  overflow-wrap: anywhere;
  font-size: 1rem;
}
.message.user { background: var(--user); }
.message.assistant, .message.relay { background: var(--assistant); }
.message.system { background: var(--panel-2); }
.message .role {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
}
.composer {
  display: block;
}
.composer-input-wrap {
  position: relative;
}
.composer-input-wrap input {
  padding-right: 150px;
}
.send-inside {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  width: auto;
  min-width: 120px;
  margin-top: 0;
  padding: 10px 16px;
  border-radius: 12px;
}
.mobile-bottom-space { display: none; }
.muted { color: var(--muted); }

@media (max-width: 1100px) {
  .app {
    grid-template-columns: minmax(280px, 330px) minmax(0, 1fr);
  }
}

@media (max-width: 900px) {
  html {
    font-size: 17px;
  }

  .app {
    grid-template-columns: 1fr;
    position: relative;
  }

  .mobile-only { display: inline-flex; }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(90vw, 380px);
    max-width: 100%;
    z-index: 20;
    border-right: 1px solid var(--border);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
    transform: translateX(-105%);
    transition: transform 0.22s ease;
  }

  .app.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .main {
    padding: 16px;
    min-height: 100vh;
  }

  .chat-header {
    align-items: flex-start;
    gap: 10px;
  }

  .chat-header-main {
    width: 100%;
    align-items: flex-start;
  }

  .typing {
    font-size: 0.9rem;
  }

  .messages {
    min-height: 48vh;
    padding: 16px;
    border-radius: 16px;
  }

  .composer {
    position: sticky;
    bottom: 0;
    padding: 12px;
    margin: 0 -4px -4px;
    background: linear-gradient(180deg, rgba(11,16,32,0) 0%, rgba(11,16,32,0.96) 18%);
    backdrop-filter: blur(6px);
  }

  .composer-input-wrap input {
    padding-right: 132px;
  }

  .send-inside {
    min-width: 108px;
    right: 6px;
    padding: 9px 14px;
  }

  .mobile-bottom-space {
    display: block;
    height: 12px;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  .sidebar, .main {
    padding: 14px;
  }

  .sidebar h1 {
    font-size: 1.35rem;
  }

  .chat-header h2 {
    font-size: 1.25rem;
  }

  input, button, select {
    padding: 13px;
    font-size: 1rem;
  }

  .composer-input-wrap input {
    padding-right: 122px;
  }

  .send-inside {
    min-width: 100px;
    padding: 8px 12px;
  }

  .message {
    padding: 12px;
  }

  .status, .box, .messages {
    border-radius: 14px;
  }
}