/* ==========================================
   AmorIA - Modern Minimalist Styles
   with Conversational Flow & Animations
   ========================================== */

:root {
  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Default Gray Palette */
  --color-primary: #6b7280;
  --color-primary-light: #9ca3af;
  --color-primary-dark: #4b5563;
  --color-accent: #374151;
  --color-accent-soft: rgba(107, 114, 128, 0.1);
  
  /* Backgrounds */
  --bg-main: #f3f4f6;
  --bg-card: #ffffff;
  --bg-sidebar: #e5e7eb;
  --bg-solid: #f3f4f6;
  --bg-chat-bot: #e5e7eb;
  --bg-chat-user: var(--color-primary);
  
  /* Text */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  
  /* Borders & Shadows */
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Animation durations */
  --transition-fast: 0.2s;
  --transition-normal: 0.4s;
  --transition-slow: 0.6s;
}

/* Topic Color Palettes - Solid backgrounds */
.theme-love {
  --color-primary: #dc2626;
  --color-primary-light: #f87171;
  --color-primary-dark: #b91c1c;
  --color-accent: #991b1b;
  --color-accent-soft: rgba(220, 38, 38, 0.1);
  --bg-solid: #fee2e2;
  --bg-sidebar: #fecaca;
  --bg-chat-bot: #fecaca;
  --bg-chat-user: #dc2626;
}

.theme-holiday {
  --color-primary: #dc2626;
  --color-primary-light: #16a34a;
  --color-primary-dark: #b91c1c;
  --color-accent: #15803d;
  --color-accent-soft: rgba(22, 163, 74, 0.1);
  --bg-solid: #dcfce7;
  --bg-sidebar: #bbf7d0;
  --bg-chat-bot: #bbf7d0;
  --bg-chat-user: #dc2626;
}

.theme-birthday {
  --color-primary: #0d9488;
  --color-primary-light: #2dd4bf;
  --color-primary-dark: #0f766e;
  --color-accent: #115e59;
  --color-accent-soft: rgba(13, 148, 136, 0.1);
  --bg-solid: #ccfbf1;
  --bg-sidebar: #99f6e4;
  --bg-chat-bot: #99f6e4;
  --bg-chat-user: #0d9488;
}

.theme-wedding {
  --color-primary: #e879a9;
  --color-primary-light: #f9a8d4;
  --color-primary-dark: #db2777;
  --color-accent: #be185d;
  --color-accent-soft: rgba(232, 121, 169, 0.1);
  --bg-solid: #fce7f3;
  --bg-sidebar: #fbcfe8;
  --bg-chat-bot: #fbcfe8;
  --bg-chat-user: #db2777;
}

.theme-friendship {
  --color-primary: #f59e0b;
  --color-primary-light: #fcd34d;
  --color-primary-dark: #d97706;
  --color-accent: #b45309;
  --color-accent-soft: rgba(245, 158, 11, 0.1);
  --bg-solid: #fef3c7;
  --bg-sidebar: #fde68a;
  --bg-chat-bot: #fde68a;
  --bg-chat-user: #d97706;
}

.theme-care {
  --color-primary: #8b5cf6;
  --color-primary-light: #a78bfa;
  --color-primary-dark: #7c3aed;
  --color-accent: #6d28d9;
  --color-accent-soft: rgba(139, 92, 246, 0.1);
  --bg-solid: #ede9fe;
  --bg-sidebar: #ddd6fe;
  --bg-chat-bot: #ddd6fe;
  --bg-chat-user: #7c3aed;
}

/* ==========================================
   Base Styles
   ========================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-solid);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  transition: background-color var(--transition-slow) ease;
}

.hidden {
  display: none !important;
}

/* ==========================================
   App Layout
   ========================================== */

.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.header {
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
  transition: border-color var(--transition-slow) ease;
  flex-shrink: 0; /* Don't shrink the header */
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.header-left {
  display: flex;
  flex-direction: column;
}

.logo {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  transition: color var(--transition-slow) ease;
}

.tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 300;
}

/* Language Switcher */
.language-switcher {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-sidebar);
  padding: 0.25rem;
  border-radius: 0.5rem;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  border: none;
  border-radius: 0.375rem;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
}

.lang-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--bg-card);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.lang-flag {
  font-size: 1rem;
}

.lang-code {
  font-weight: 600;
}

/* Main Layout */
.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  min-height: 0; /* Important for flex child to allow shrinking */
  overflow: hidden;
}

/* ==========================================
   Center Panel
   ========================================== */

.center-panel {
  padding: 2rem 3rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  min-height: 0; /* Allow shrinking in flex context */
}

/* Welcome State */
.welcome-state {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 500px;
  margin: auto;
  animation: fadeIn var(--transition-normal) ease;
}

.welcome-icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  opacity: 0.6;
}

.welcome-state h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.welcome-state p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 300;
}

/* Phase Header */
.phase-header {
  text-align: center;
  margin-bottom: 1.5rem;
  flex-shrink: 0;
}

.topic-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--color-accent-soft);
  color: var(--color-primary);
  border-radius: 2rem;
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: background-color var(--transition-slow) ease, color var(--transition-slow) ease;
}

.phase-header h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-top: 0.75rem;
}

/* ==========================================
   Conversation / Chat Styles
   ========================================== */

.conversation-phase {
  display: flex;
  flex-direction: column;
  height: 100%;
  animation: fadeIn var(--transition-normal) ease;
  justify-content: center;
  position: relative;
}

/* Wrapper to contain chat and fade overlay */
.chat-wrapper {
  position: relative;
  flex: 0 1 auto;
  max-height: 50vh;
  display: flex;
  flex-direction: column;
}

/* Fade overlay at the top - matches solid background */
.chat-fade-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 140px;
  pointer-events: none;
  z-index: 10;
  /* Default gray - matches --bg-solid: #f3f4f6 */
  background: linear-gradient(
    to bottom,
    #f3f4f6 0%,
    #f3f4f6 30%,
    rgba(243, 244, 246, 0.6) 60%,
    rgba(243, 244, 246, 0) 100%
  );
}

/* Theme-specific fade overlays - matching --bg-solid values */
.theme-love .chat-fade-overlay {
  /* --bg-solid: #fee2e2 */
  background: linear-gradient(
    to bottom,
    #fee2e2 0%,
    #fee2e2 30%,
    rgba(254, 226, 226, 0.6) 60%,
    rgba(254, 226, 226, 0) 100%
  );
}

.theme-holiday .chat-fade-overlay {
  /* --bg-solid: #dcfce7 */
  background: linear-gradient(
    to bottom,
    #dcfce7 0%,
    #dcfce7 30%,
    rgba(220, 252, 231, 0.6) 60%,
    rgba(220, 252, 231, 0) 100%
  );
}

.theme-birthday .chat-fade-overlay {
  /* --bg-solid: #ccfbf1 */
  background: linear-gradient(
    to bottom,
    #ccfbf1 0%,
    #ccfbf1 30%,
    rgba(204, 251, 241, 0.6) 60%,
    rgba(204, 251, 241, 0) 100%
  );
}

.theme-wedding .chat-fade-overlay {
  /* --bg-solid: #fce7f3 */
  background: linear-gradient(
    to bottom,
    #fce7f3 0%,
    #fce7f3 30%,
    rgba(252, 231, 243, 0.6) 60%,
    rgba(252, 231, 243, 0) 100%
  );
}

.theme-friendship .chat-fade-overlay {
  /* --bg-solid: #fef3c7 */
  background: linear-gradient(
    to bottom,
    #fef3c7 0%,
    #fef3c7 30%,
    rgba(254, 243, 199, 0.6) 60%,
    rgba(254, 243, 199, 0) 100%
  );
}

.theme-care .chat-fade-overlay {
  /* --bg-solid: #ede9fe */
  background: linear-gradient(
    to bottom,
    #ede9fe 0%,
    #ede9fe 30%,
    rgba(237, 233, 254, 0.6) 60%,
    rgba(237, 233, 254, 0) 100%
  );
}

.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
  scroll-behavior: smooth;
  /* Hide scrollbar but keep functionality */
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

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

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

.chat-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: flex-end;
  min-height: 100%;
  padding-top: 120px; /* Space so content can scroll under the fade */
}

/* Chat Message Bubble */
.chat-message {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  animation: messageSlideIn var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
}

.chat-message.bot {
  align-self: flex-start;
}

.chat-message.user {
  align-self: flex-end;
}

.message-bubble {
  padding: 0.875rem 1.25rem;
  border-radius: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.5;
  position: relative;
}

.chat-message.bot .message-bubble {
  background: var(--bg-chat-bot);
  color: var(--text-primary);
  border-bottom-left-radius: 0.25rem;
  transition: background-color var(--transition-slow) ease;
}

.chat-message.user .message-bubble {
  background: var(--bg-chat-user);
  color: white;
  border-bottom-right-radius: 0.25rem;
  transition: background-color var(--transition-slow) ease;
}

/* Typing Indicator in Chat */
.chat-message.typing .message-bubble {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem 1.5rem;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
  transition: background-color var(--transition-slow) ease;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }
.typing-dot:nth-child(3) { animation-delay: 0s; }

@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}

/* Chat Input Area */
.chat-input-area {
  flex-shrink: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  transition: border-color var(--transition-slow) ease;
}

.input-wrapper {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.chat-input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  border: 2px solid var(--border-color);
  border-radius: 2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--bg-card);
  color: var(--text-primary);
  transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.send-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-fast) ease, transform var(--transition-fast) ease;
}

.send-btn:hover {
  background: var(--color-primary-dark);
  transform: scale(1.05);
}

.send-btn:active {
  transform: scale(0.95);
}

.input-hint {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* ==========================================
   Message Result Phase
   ========================================== */

.message-phase {
  width: 100%;
  max-width: 650px;
  margin: 0 auto;
  animation: fadeIn var(--transition-normal) ease;
  padding-bottom: 2rem; /* Prevent footer overlap */
}

.message-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-slow) ease;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.message-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.message-loading p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.typing-indicator {
  display: flex;
  gap: 0.35rem;
}

.typing-indicator span {
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
  transition: background-color var(--transition-slow) ease;
}

.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
.typing-indicator span:nth-child(3) { animation-delay: 0s; }

.message-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.8;
  color: var(--text-primary);
  font-style: italic;
  text-align: center;
  animation: fadeIn var(--transition-normal) ease;
}

/* Message Actions */
.message-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
}

.action-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.action-btn.copy-btn.copied {
  background: var(--color-accent-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Refinement Section */
.refinement-section {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  padding-bottom: 1rem;
  transition: border-color var(--transition-slow) ease;
}

.refinement-section h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: center;
}

.refinement-input-group {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.refinement-input {
  flex: 1;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--bg-card);
  color: var(--text-primary);
  resize: none;
  transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}

.refinement-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.refine-btn {
  padding: 0.875rem 1.5rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast) ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.refine-btn:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

.refine-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Loader Animation */
.btn-loader {
  display: flex;
  gap: 0.25rem;
}

.loader-dot {
  width: 6px;
  height: 6px;
  background: white;
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
}

.loader-dot:nth-child(1) { animation-delay: -0.32s; }
.loader-dot:nth-child(2) { animation-delay: -0.16s; }

/* ==========================================
   Sidebar
   ========================================== */

.sidebar {
  background: var(--bg-sidebar);
  border-left: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  transition: background-color var(--transition-slow) ease, border-color var(--transition-slow) ease;
}

.sidebar-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.topic-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.topic-btn {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 0.75rem;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
  text-align: left;
}

.topic-btn:hover {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.topic-btn.active {
  background: var(--bg-card);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.topic-icon {
  font-size: 1.35rem;
}

.topic-name {
  flex: 1;
}

/* ==========================================
   Footer
   ========================================== */

.footer {
  padding: 1rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  transition: border-color var(--transition-slow) ease;
  flex-shrink: 0; /* Don't shrink the footer */
}

.footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 300;
}

/* ==========================================
   Toast Notification
   ========================================== */

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text-primary);
  color: white;
  padding: 0.875rem 1.5rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  opacity: 0;
  transition: transform var(--transition-fast) ease, opacity var(--transition-fast) ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* Phase transition animation */
.phase-exit {
  animation: fadeOut var(--transition-fast) ease forwards;
}

.phase-enter {
  animation: fadeIn var(--transition-normal) ease;
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  
  .sidebar {
    order: -1;
    border-left: none;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
  }
  
  .topic-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .topic-btn {
    flex: 0 0 auto;
    padding: 0.75rem 1rem;
  }
  
  .center-panel {
    padding: 1.5rem;
    padding-bottom: 2rem;
    height: auto;
    min-height: calc(100vh - 280px);
  }

  .header-content {
    flex-direction: column;
    gap: 1rem;
  }

  .header-left {
    text-align: center;
  }

  .message-phase {
    padding-bottom: 2rem;
  }
}

@media (max-width: 600px) {
  .header {
    padding: 1rem;
  }
  
  .logo {
    font-size: 1.75rem;
  }
  
  .center-panel {
    padding: 1rem;
  }
  
  .message-card {
    padding: 1.5rem;
  }
  
  .message-text {
    font-size: 1.15rem;
  }
  
  .refinement-input-group {
    flex-direction: column;
  }
  
  .refine-btn {
    width: 100%;
    justify-content: center;
  }
  
  .message-actions {
    flex-direction: column;
  }
  
  .action-btn {
    justify-content: center;
  }

  .chat-message {
    max-width: 95%;
  }

  .language-switcher {
    gap: 0.125rem;
  }

  .lang-btn {
    padding: 0.5rem 0.75rem;
  }

  .lang-code {
    font-size: 0.75rem;
  }

  /* Ensure content doesn't get hidden behind footer */
  .center-panel {
    padding-bottom: 2rem;
  }

  .message-phase {
    padding-bottom: 3rem;
  }

  .refinement-section {
    padding-bottom: 2rem;
  }
}