:root {
  /* Paleta — idéntica a OnboardingApp (Agentes IA en Acción) */
  --color-primary: #2d5a7b;
  --color-primary-light: #3d7ba8;
  --color-primary-dark: #1d3a4b;
  --color-accent: #d4a574;
  --color-accent-light: #e4c5a4;
  --color-background: #0a0e27;
  --color-background-light: #1a1e37;
  --color-surface: rgba(255, 255, 255, 0.05);
  --color-surface-elevated: rgba(255, 255, 255, 0.08);
  --color-text: #e8eaf0;
  --color-text-muted: #a8aab5;
  --color-text-dark: #0a0e27;
  --color-success: #4ade80;
  --color-error: #f87171;

  --font-display: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;

  --header-height: 68px;
  --composer-height: 92px;

  --border-radius: 1rem;
  --border-radius-sm: 0.5rem;
  --border-radius-lg: 1.5rem;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --blur-glass: blur(14px);

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.6;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(ellipse 60% 50% at 20% 0%, rgba(61, 123, 168, 0.18), transparent 60%),
    radial-gradient(ellipse 50% 40% at 90% 100%, rgba(212, 165, 116, 0.12), transparent 60%);
}

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

/* ============ HEADER ============ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 14, 39, 0.72);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-container {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
  text-decoration: none;
  min-width: 0;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(212, 165, 116, 0.3), 0 0 20px rgba(212, 165, 116, 0.15);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  min-width: 0;
}

.logo-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.logo-tag {
  font-size: 0.75rem;
  color: var(--color-accent);
  opacity: 0.85;
  letter-spacing: 0.02em;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-ghost:hover {
  color: var(--color-text);
  border-color: rgba(212, 165, 116, 0.4);
  background: rgba(212, 165, 116, 0.08);
}

.btn-ghost[hidden] {
  display: none;
}

/* ============ CHAT CONTAINER ============ */

.chat {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: var(--composer-height);
  overflow-y: auto;
  scroll-behavior: smooth;
}

.chat::-webkit-scrollbar {
  width: 8px;
}

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

.chat::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
}

.chat::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* ============ WELCOME ============ */

.welcome {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem 3rem;
}

.welcome[hidden] {
  display: none;
}

.welcome-inner {
  width: 100%;
  max-width: 760px;
  text-align: center;
  animation: fadeInUp 0.7s ease-out;
}

.welcome-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
}

.welcome-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-success);
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.welcome-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--color-text) 20%, var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-title .gold {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-description {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.suggestions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  max-width: 680px;
  margin: 0 auto;
}

.suggestion {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
  background: var(--color-surface-elevated);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.suggestion:hover {
  border-color: rgba(212, 165, 116, 0.4);
  background: rgba(212, 165, 116, 0.06);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.suggestion:active {
  transform: translateY(0);
}

.suggestion-icon {
  font-size: 1.35rem;
  line-height: 1;
  flex-shrink: 0;
}

.suggestion-text {
  flex: 1;
  line-height: 1.35;
}

/* ============ MESSAGES ============ */

.messages {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.messages[hidden] {
  display: none;
}

.message {
  display: flex;
  gap: 0.85rem;
  max-width: 100%;
  animation: messageIn 0.35s ease-out;
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
  font-weight: 600;
  overflow: hidden;
}

.message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.message-body {
  padding: 0.9rem 1.1rem;
  border-radius: var(--border-radius);
  line-height: 1.65;
  font-size: 1rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* Mensaje del mentor (izquierda) */
.message.mentor .message-avatar {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 0 0 1px rgba(212, 165, 116, 0.3);
}

.message.mentor .message-body {
  background: var(--color-surface-elevated);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--color-text);
  border-top-left-radius: 0.375rem;
}

/* Mensaje del usuario (derecha) */
.message.user {
  flex-direction: row-reverse;
}

.message.user .message-avatar {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.message.user .message-body {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #ffffff;
  border-top-right-radius: 0.375rem;
  box-shadow: 0 2px 12px rgba(45, 90, 123, 0.25);
}

.message.user .message-body a {
  color: #ffffff;
  text-decoration: underline;
}

/* Typing indicator */
.message.typing .message-body {
  padding: 1rem 1.2rem;
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
}

.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: typingPulse 1.3s ease-in-out infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.15s; }
.typing-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes typingPulse {
  0%, 60%, 100% { transform: scale(0.7); opacity: 0.4; }
  30% { transform: scale(1); opacity: 1; }
}

/* Markdown dentro de mensajes del mentor */
.message.mentor .message-body p {
  margin-bottom: 0.65rem;
}

.message.mentor .message-body p:last-child {
  margin-bottom: 0;
}

.message.mentor .message-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.message.mentor .message-body em {
  color: var(--color-accent-light);
}

.message.mentor .message-body ul,
.message.mentor .message-body ol {
  margin: 0.5rem 0 0.75rem 1.35rem;
}

.message.mentor .message-body li {
  margin-bottom: 0.3rem;
}

.message.mentor .message-body li::marker {
  color: var(--color-accent);
}

.message.mentor .message-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.message.mentor .message-body a:hover {
  color: var(--color-accent-light);
}

.message.mentor .message-body code {
  background: rgba(212, 165, 116, 0.1);
  color: var(--color-accent-light);
  padding: 0.1rem 0.4rem;
  border-radius: 0.35rem;
  font-size: 0.92em;
  font-family: 'SF Mono', Menlo, Consolas, monospace;
}

.message.mentor .message-body pre {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.9rem 1rem;
  border-radius: var(--border-radius-sm);
  overflow-x: auto;
  margin: 0.6rem 0;
  font-size: 0.9rem;
  line-height: 1.55;
}

.message.mentor .message-body pre code {
  background: transparent;
  padding: 0;
  color: var(--color-text);
  font-size: inherit;
}

.message.mentor .message-body h1,
.message.mentor .message-body h2,
.message.mentor .message-body h3 {
  font-family: var(--font-display);
  color: var(--color-text);
  margin: 0.6rem 0 0.4rem;
  line-height: 1.25;
}

.message.mentor .message-body h1 { font-size: 1.35rem; }
.message.mentor .message-body h2 { font-size: 1.2rem; }
.message.mentor .message-body h3 { font-size: 1.05rem; color: var(--color-accent); }

.message.mentor .message-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.25rem 0 0.25rem 0.9rem;
  margin: 0.6rem 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.message.mentor .message-body hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin: 1rem 0;
}

/* Error message */
.message.error .message-body {
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--color-error);
}

.message.error .message-avatar {
  background: rgba(248, 113, 113, 0.15);
  color: var(--color-error);
  border: 1px solid rgba(248, 113, 113, 0.3);
}

.retry-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.6rem;
  padding: 0.4rem 0.85rem;
  background: rgba(248, 113, 113, 0.15);
  border: 1px solid rgba(248, 113, 113, 0.4);
  border-radius: var(--border-radius-sm);
  color: var(--color-error);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.retry-btn:hover {
  background: rgba(248, 113, 113, 0.25);
}

/* ============ COMPOSER (input bar) ============ */

.composer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 0.75rem 1rem 1rem;
  background: linear-gradient(180deg, rgba(10, 14, 39, 0) 0%, rgba(10, 14, 39, 0.9) 30%, rgba(10, 14, 39, 1) 100%);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.composer-inner {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 0.6rem;
  padding: 0.45rem 0.45rem 0.45rem 0.85rem;
  background: var(--color-surface-elevated);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-fast);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.composer-inner:focus-within {
  border-color: rgba(212, 165, 116, 0.5);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25), 0 0 0 3px rgba(212, 165, 116, 0.1);
}

.composer-input {
  flex: 1;
  min-height: 44px;
  max-height: 200px;
  padding: 0.65rem 0.25rem;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  overflow-y: auto;
}

.composer-input::placeholder {
  color: var(--color-text-muted);
  opacity: 0.65;
}

.composer-input::-webkit-scrollbar {
  width: 6px;
}

.composer-input::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.composer-send {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(212, 165, 116, 0.25);
}

.composer-send:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(212, 165, 116, 0.4);
}

.composer-send:active:not(:disabled) {
  transform: translateY(0);
}

.composer-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.composer-hint {
  max-width: 820px;
  margin: 0.5rem auto 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  opacity: 0.6;
}

/* ============ RESPONSIVE ============ */

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
    --composer-height: 84px;
  }

  .header-container {
    padding: 0 1rem;
  }

  .logo-icon {
    width: 34px;
    height: 34px;
  }

  .logo-name {
    font-size: 1.1rem;
  }

  .logo-tag {
    font-size: 0.7rem;
  }

  .btn-ghost span:last-child {
    display: none;
  }

  .btn-ghost {
    padding: 0.5rem;
    width: 36px;
    height: 36px;
    justify-content: center;
  }

  .welcome {
    padding: 1.5rem 1rem 2rem;
  }

  .welcome-title {
    font-size: clamp(1.75rem, 7vw, 2.5rem);
  }

  .welcome-description {
    font-size: 1rem;
    margin-bottom: 2rem;
  }

  .suggestions {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }

  .suggestion {
    padding: 0.85rem 1rem;
  }

  .messages {
    padding: 1.25rem 0.85rem 1.5rem;
    gap: 1rem;
  }

  .message-avatar {
    width: 32px;
    height: 32px;
  }

  .message-body {
    padding: 0.8rem 1rem;
    font-size: 0.95rem;
  }

  .composer {
    padding: 0.6rem 0.75rem 0.75rem;
  }

  .composer-inner {
    padding: 0.4rem 0.4rem 0.4rem 0.75rem;
  }

  .composer-send {
    width: 40px;
    height: 40px;
  }

  .composer-input {
    font-size: 16px; /* previene zoom iOS */
  }

  .composer-hint {
    font-size: 0.7rem;
  }
}

@media (max-width: 420px) {
  .logo-tag {
    display: none;
  }

  .welcome-badge {
    font-size: 0.8rem;
  }

  .suggestion-icon {
    font-size: 1.2rem;
  }

  .suggestion-text {
    font-size: 0.9rem;
  }
}

/* Respeto a reduce-motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}