:root {
  --bg: #0f1115;
  --panel: rgba(24, 28, 37, 0.92);
  --panel-alt: rgba(16, 19, 27, 0.84);
  --panel-soft: rgba(255, 255, 255, 0.05);
  --line: rgba(255, 255, 255, 0.09);
  --text: #eef2ff;
  --muted: #9aa7c2;
  --accent: #ff7b54;
  --accent-2: #ffd166;
  --assistant: #1d2433;
  --user: #2f1f19;
  --radius: 20px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  font-family: "DM Sans", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 123, 84, 0.18), transparent 30%),
    radial-gradient(circle at bottom right, rgba(255, 209, 102, 0.12), transparent 28%),
    linear-gradient(180deg, #090b10 0%, #121722 100%);
}

button,
input,
select,
textarea {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px 18px;
  background: rgba(7, 9, 14, 0.82);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand,
.chat-header,
.panel,
.composer,
.message {
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(255, 123, 84, 0.16), rgba(255, 255, 255, 0.04));
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #171717;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 4px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
}

h1,
h2,
p {
  margin: 0;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 13px;
  color: var(--muted);
}

.password-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 12px 14px;
}

textarea {
  min-height: 56px;
  max-height: 240px;
  resize: none;
}

.button {
  border: 0;
  border-radius: 16px;
  padding: 12px 14px;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.button-block {
  width: 100%;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), #ff966e);
  color: #1c160f;
  font-weight: 700;
}

.button-muted {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.button-ghost {
  background: transparent;
  color: var(--muted);
  padding: 8px 10px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-alt);
  padding: 12px;
}

.panel-note {
  margin-top: auto;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.session-list {
  display: grid;
  gap: 8px;
  max-height: 42vh;
  overflow: auto;
}

.session-item {
  padding: 12px;
  border-radius: 16px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
}

.session-item.active {
  border-color: rgba(255, 209, 102, 0.4);
  background: rgba(255, 123, 84, 0.12);
}

.session-item h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.session-item p {
  font-size: 12px;
  color: var(--muted);
}

.chat-panel {
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  gap: 16px;
  padding: 24px;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  backdrop-filter: blur(18px);
}

.status-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-size: 13px;
}

.pill-live {
  color: #10121b;
  background: linear-gradient(135deg, #b8ffda, #7af8b9);
}

.messages {
  display: grid;
  align-content: start;
  gap: 14px;
  overflow: auto;
  padding-right: 4px;
}

.message {
  width: min(860px, 100%);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 18px;
  background: var(--assistant);
}

.message.user {
  margin-left: auto;
  background: var(--user);
}

.message-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.message-body {
  white-space: pre-wrap;
  line-height: 1.6;
}

.message-files,
.attachment-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.message-file,
.attachment-card {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 16px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 13px;
}

.attachment-preview {
  padding: 0 2px;
}

.attachment-card img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.hidden {
  display: none;
}

.composer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(18px);
}

@media (max-width: 960px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .chat-panel {
    padding-top: 16px;
  }
}

@media (max-width: 680px) {
  .sidebar,
  .chat-panel {
    padding: 16px;
  }

  .chat-header,
  .composer {
    border-radius: 20px;
  }

  .chat-header {
    display: grid;
  }

  .status-group {
    justify-content: flex-start;
  }

  .composer {
    grid-template-columns: 1fr;
  }

  .button,
  input,
  select,
  textarea {
    font-size: 16px;
  }
}