:root {
  --bg: #0f172a;
  --bg-elevated: #111827;
  --bg-input: #020617;
  --border-subtle: #1f2937;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --assistant-bg: #111827;
  --user-bg: #22c55e;
  --user-text: #022c22;
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --danger: #f87171;
  --radius-lg: 14px;
  --radius-sm: 8px;
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.45);
  --transition-fast: 0.15s ease-out;
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: radial-gradient(circle at top, #1e293b 0, #020617 45%, #000 100%);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.app-container {
  width: 100%;
  max-width: 900px;
  height: 90vh;
  max-height: 720px;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.96));
  border-radius: 24px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */

.app-header {
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 55%);
}

.title-block {
  flex: 1 1 220px;
}

.title-block h1 {
  margin: 0 0 4px;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}

.title-block p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.endpoint-block {
  flex: 1 1 260px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.endpoint-block label {
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

#endpoint-input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.85);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  box-shadow: 0 0 0 1px transparent;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#endpoint-input::placeholder {
  color: #6b7280;
}

#endpoint-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.6);
  background: #020617;
}

.endpoint-block small {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Chat */

.chat-container {
  flex: 1;
  padding: 12px 16px 10px;
  overflow: hidden;
}

.chat-messages {
  height: 100%;
  overflow-y: auto;
  padding-right: 6px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message-row {
  display: flex;
  width: 100%;
}

.message-row.assistant {
  justify-content: flex-start;
}

.message-row.user {
  justify-content: flex-end;
}

.message-bubble {
  max-width: 76%;
  border-radius: 18px;
  padding: 8px 11px;
  font-size: 0.9rem;
  line-height: 1.4;
  position: relative;
}

.message-row.assistant .message-bubble {
  background: linear-gradient(135deg, rgba(15, 23, 42, 1), rgba(15, 23, 42, 0.9));
  border: 1px solid rgba(148, 163, 184, 0.4);
  border-bottom-left-radius: 4px;
}

.message-row.user .message-bubble {
  background: linear-gradient(135deg, var(--user-bg), #4ade80);
  color: var(--user-text);
  border-bottom-right-radius: 4px;
}

.message-meta {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 3px;
  opacity: 0.7;
}

.message-row.user .message-meta {
  text-align: right;
}

.message-text {
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* Input */

.input-container {
  padding: 8px 16px 14px;
  border-top: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.98));
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#chat-form {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#message-input {
  flex: 1;
  resize: none;
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.9rem;
  max-height: 120px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#message-input::placeholder {
  color: #6b7280;
}

#message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.6);
}

#send-button {
  border: none;
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  background: radial-gradient(circle at top left, #38bdf8, #0ea5e9);
  color: #0b1120;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast), opacity var(--transition-fast);
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.45);
}

#send-button:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
  box-shadow: 0 14px 32px rgba(56, 189, 248, 0.5);
}

#send-button:active {
  transform: translateY(0);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.4);
}

#send-button:disabled {
  opacity: 0.6;
  cursor: default;
  transform: none;
  box-shadow: none;
}

/* Status */

.status-line {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Error */

.status-line.error {
  color: var(--danger);
}

/* Scrollbar */

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(75, 85, 99, 0.9);
  border-radius: 999px;
}

/* Responsivo */

@media (max-width: 768px) {
  .app-container {
    height: 100vh;
    max-height: none;
    border-radius: 16px;
  }

  .message-bubble {
    max-width: 82%;
  }

  .app-header {
    flex-direction: column;
  }
}