/* --- Root Theme Variables & Color Schemes (Liquid Glass Edition) --- */
:root {
  --bg-dark: #050508;
  --card-bg: rgba(13, 15, 23, 0.65);
  --header-bg: rgba(15, 18, 28, 0.75);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  /* Liquid Glass Frost & Refraction Tokens */
  --glass-blur: blur(20px);
  --glass-border: 1px solid rgba(255, 255, 255, 0.12);
  --glass-border-inner: inset 0 1px 0 0 rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 16px 40px 0 rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.05);

  /* Default Theme (Purple Liquid Glow) */
  --logo-grad: linear-gradient(135deg, #f43f5e 0%, #a855f7 50%, #6366f1 75%, #14b8a6 100%);
  --logo-glow: rgba(168, 85, 247, 0.35);
  --user-msg-grad: linear-gradient(135deg, #e11d48 0%, #9333ea 100%);
  --bot-msg-bg: rgba(24, 27, 38, 0.55);
  --input-bg: rgba(17, 20, 28, 0.65);
  --border-color: rgba(255, 255, 255, 0.08);
}

body[data-theme="green"] {
  --logo-grad: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --logo-glow: rgba(16, 185, 129, 0.35);
  --user-msg-grad: linear-gradient(135deg, #059669 0%, #2563eb 100%);
}

body[data-theme="gold"] {
  --logo-grad: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --logo-glow: rgba(245, 158, 11, 0.35);
  --user-msg-grad: linear-gradient(135deg, #d97706 0%, #dc2626 100%);
}

body[data-theme="cyberpunk"] {
  --logo-grad: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
  --logo-glow: rgba(236, 72, 153, 0.35);
  --user-msg-grad: linear-gradient(135deg, #db2777 0%, #7c3aed 100%);
}

body[data-theme="crimson"] {
  --logo-grad: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
  --logo-glow: rgba(239, 68, 68, 0.35);
  --user-msg-grad: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
}

/* --- Global Reset & Setup with Ambient Liquid Background --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  height: 100dvh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow: hidden;
  position: fixed;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(168, 85, 247, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(20, 184, 166, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(239, 68, 68, 0.08) 0%, transparent 50%);
  background-repeat: no-repeat;
  background-size: cover;
}

/* --- Slide-out Settings Sidebar (Liquid Frost) --- */
#settings-sidebar {
  position: fixed;
  top: 0;
  left: -320px;
  width: 300px;
  height: 100%;
  background: rgba(13, 15, 23, 0.92);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border-right: var(--glass-border);
  box-shadow: 20px 0 50px rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 20px;
  transition: left 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

#settings-sidebar.open {
  left: 0;
}

#sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease-in-out;
}

#sidebar-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: var(--glass-border);
  padding-bottom: 12px;
}

.sidebar-header h3 {
  font-size: 1rem;
  font-weight: 700;
}

#close-sidebar-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 8px;
}

.sidebar-section {
  margin-bottom: 20px;
}

.sidebar-section h4 {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 10px;
}

.theme-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.theme-pill {
  border: var(--glass-border);
  color: #fff;
  padding: 10px;
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  opacity: 0.9;
  backdrop-filter: blur(10px);
}

.sidebar-select {
  width: 100%;
  background: var(--input-bg);
  backdrop-filter: blur(10px);
  color: var(--text-main);
  border: var(--glass-border);
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
}

.voice-slider-group-vertical {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.voice-slider-group-vertical input[type="range"] {
  width: 100%;
  margin-top: 8px;
  accent-color: #a855f7;
  cursor: pointer;
  height: 24px;
}

/* --- Full Screen Liquid Glass Chat Shell --- */
#chat-container {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  box-shadow: var(--glass-shadow);
  overflow: hidden;
  position: relative;
}

#chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--header-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-bottom: var(--glass-border);
  position: relative;
  flex-shrink: 0;
  z-index: 10;
}

#chat-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--logo-grad);
}

.header-left-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chat-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: contain;
  background: rgba(0, 0, 0, 0.4);
  padding: 3px;
  border: var(--glass-border);
  flex-shrink: 0;
}

.header-text h2 {
  font-size: 1rem;
  font-weight: 700;
  background: var(--logo-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-text p {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.version-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  background: rgba(255, 255, 255, 0.08);
  border: var(--glass-border);
  border-radius: 6px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.header-actions {
  display: flex;
  gap: 4px;
}

.header-icon-btn {
  background: rgba(255, 255, 255, 0.03);
  border: var(--glass-border);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0.85;
  padding: 8px 10px;
  border-radius: 10px;
}

/* --- Search Bar --- */
#search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(15, 18, 28, 0.9);
  border-bottom: var(--glass-border);
}

#search-bar.hidden {
  display: none;
}

#search-input {
  flex: 1;
  padding: 8px 12px;
  background: var(--input-bg);
  border: var(--glass-border);
  color: var(--text-main);
  border-radius: 10px;
  font-size: 0.9rem;
  outline: none;
}

#close-search-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  font-size: 1rem;
}

/* --- Quick Prompts Chips --- */
#quick-prompts {
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  overflow-x: auto;
  white-space: nowrap;
  background: rgba(5, 5, 8, 0.25);
  border-bottom: var(--glass-border);
  scrollbar-width: none;
}

#quick-prompts::-webkit-scrollbar {
  display: none;
}

.chip {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: var(--glass-border);
  color: var(--text-main);
  padding: 7px 12px;
  border-radius: 16px;
  font-size: 0.78rem;
  cursor: pointer;
  flex-shrink: 0;
}

/* --- Chat Output Box --- */
#chat-box {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  -webkit-overflow-scrolling: touch;
}

#chat-box::-webkit-scrollbar {
  width: 4px;
}

#chat-box::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 10px;
}

.message-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
}

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

.msg-avatar {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  object-fit: contain;
  background: rgba(0, 0, 0, 0.4);
  padding: 2px;
  border: var(--glass-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.message {
  max-width: 85%;
  padding: 12px 16px;
  font-size: 0.93rem;
  line-height: 1.5;
  word-wrap: break-word;
  border-radius: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.user-message {
  background: var(--user-msg-grad);
  color: #ffffff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 8px 24px rgba(147, 51, 234, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.bot-message {
  background-color: var(--bot-msg-bg);
  color: var(--text-main);
  border: var(--glass-border);
  box-shadow: var(--glass-border-inner), 0 8px 32px rgba(0, 0, 0, 0.2);
  border-bottom-left-radius: 4px;
}

.bot-message pre {
  background: rgba(10, 12, 18, 0.85);
  padding: 10px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 8px 0;
  border: var(--glass-border);
}

.bot-message code {
  font-family: monospace;
  font-size: 0.82rem;
}

/* --- Message Actions & Reactions --- */
.msg-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  align-items: center;
}

.action-btn {
  background: rgba(255, 255, 255, 0.06);
  border: var(--glass-border);
  color: var(--text-main);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.action-btn:active {
  transform: scale(0.96);
}

/* --- Input Bar --- */
#input-container {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px)) 16px;
  background: var(--header-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: var(--glass-border);
  flex-shrink: 0;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  z-index: 10;
}

.input-icon-btn {
  background: rgba(255, 255, 255, 0.03);
  border: var(--glass-border);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 10px;
  border-radius: 12px;
  flex-shrink: 0;
}

.input-icon-btn.listening {
  background: rgba(239, 68, 68, 0.3);
  border-color: rgba(239, 68, 68, 0.6);
  border-radius: 50%;
}

#user-input {
  flex: 1;
  padding: 11px 16px;
  font-size: 16px;
  color: var(--text-main);
  background-color: var(--input-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: var(--glass-border);
  border-radius: 22px;
  outline: none;
}

#send-btn {
  padding: 11px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--logo-grad);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 15px var(--logo-glow);
  border-radius: 22px;
  cursor: pointer;
  flex-shrink: 0;
}

#send-btn.stop-mode {
  background: linear-gradient(135deg, #ef4444 0%, #991b1b 100%);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

/* --- Custom Modals & Games Hub --- */
.custom-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 2000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.custom-modal.hidden {
  opacity: 0;
  pointer-events: none;
  display: none;
}

.modal-content.glass-card {
  background: rgba(13, 15, 23, 0.9);
  border: var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: 20px;
  width: 90%;
  max-width: 500px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  max-height: 85vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: var(--glass-border);
  padding-bottom: 12px;
  margin-bottom: 15px;
}

.close-modal-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.game-hub-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 10px;
}

.game-card {
  background: var(--input-bg);
  border: var(--glass-border);
  color: var(--text-main);
  padding: 14px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: transform 0.2s;
}

.game-card:hover {
  transform: scale(1.02);
  border-color: rgba(255, 255, 255, 0.3);
}

#game-frame {
  width: 100%;
  height: 350px;
  border-radius: 10px;
  border: var(--glass-border);
  background: #000;
}

.quiz-opt-btn {
  background: var(--input-bg);
  border: var(--glass-border);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.quiz-opt-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.quiz-opt-btn.correct {
  background: rgba(16, 185, 129, 0.4);
  border-color: #10b981;
}

.quiz-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.4);
  border-color: #ef4444;
}

/* Tablet & PC Media Queries */
@media (min-width: 768px) {
  #chat-container {
    width: 92vw;
    height: 92vh;
    border-radius: 24px;
  }
  #chat-box {
    padding: 24px;
  }
  #input-container {
    padding: 16px 24px;
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 24px;
  }
}