/* Nexus AI Chat Design System */

:root {
  --font-sans: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'Fira Code', monospace;
  --sidebar-width: 280px;

  /* Transition Constants */
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* Light / White-dominant mode variables (Default) */
body {
  --bg-dark: #f8fafc;
  --bg-panel: rgba(255, 255, 255, 0.75);
  --bg-sidebar: rgba(245, 247, 252, 0.97);
  --border-color: rgba(99, 102, 241, 0.08);
  --border-hover: rgba(99, 102, 241, 0.15);
  --text-main: #1e1b4b;
  --text-muted: #6366a0;
  --text-dim: #8b8db8;

  --shadow-sm: 0 4px 16px rgba(99, 102, 241, 0.06);
  --shadow-lg: 0 20px 48px rgba(99, 102, 241, 0.1);

  --code-bg: #f0f0ff;
  --code-header-bg: #e8e8f8;
  --modal-bg: #ffffff;
  --input-bg: rgba(255, 255, 255, 0.9);
  --btn-cancel-bg: rgba(99, 102, 241, 0.05);
  --btn-cancel-hover: rgba(99, 102, 241, 0.08);
  --toggle-mode-bg: rgba(99, 102, 241, 0.04);
  --header-bg: rgba(248, 250, 252, 0.8);
  --form-bg: rgba(255, 255, 255, 0.7);
  --overlay-subtle: rgba(99, 102, 241, 0.03);
  --overlay-hover: rgba(99, 102, 241, 0.05);
  --divider-color: rgba(99, 102, 241, 0.06);
}

/* Dark mode variables */
body.theme-mode-dark {
  --bg-dark: #0b0b14;
  --bg-panel: rgba(15, 15, 28, 0.65);
  --bg-sidebar: rgba(10, 10, 20, 0.97);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text-main: #f3f4f6;
  --text-muted: #a5a8d0;
  --text-dim: #7578a8;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.6);

  --code-bg: #0f0f1e;
  --code-header-bg: #161628;
  --modal-bg: #0e0e1c;
  --input-bg: rgba(15, 15, 28, 0.6);
  --btn-cancel-bg: rgba(255, 255, 255, 0.05);
  --btn-cancel-hover: rgba(255, 255, 255, 0.08);
  --toggle-mode-bg: rgba(255, 255, 255, 0.04);
  --header-bg: rgba(10, 10, 20, 0.75);
  --form-bg: rgba(15, 15, 28, 0.55);
  --overlay-subtle: rgba(255, 255, 255, 0.03);
  --overlay-hover: rgba(255, 255, 255, 0.05);
  --divider-color: rgba(255, 255, 255, 0.04);
}

/* Light mode (explicit) */
body.theme-mode-light {
  --bg-dark: #f8fafc;
  --bg-panel: rgba(255, 255, 255, 0.75);
  --bg-sidebar: rgba(245, 247, 252, 0.97);
  --border-color: rgba(99, 102, 241, 0.08);
  --border-hover: rgba(99, 102, 241, 0.15);
  --text-main: #1e1b4b;
  --text-muted: #6366a0;
  --text-dim: #8b8db8;

  --shadow-sm: 0 4px 16px rgba(99, 102, 241, 0.06);
  --shadow-lg: 0 20px 48px rgba(99, 102, 241, 0.1);

  --code-bg: #f0f0ff;
  --code-header-bg: #e8e8f8;
  --modal-bg: #ffffff;
  --input-bg: rgba(255, 255, 255, 0.9);
  --btn-cancel-bg: rgba(99, 102, 241, 0.05);
  --btn-cancel-hover: rgba(99, 102, 241, 0.08);
  --toggle-mode-bg: rgba(99, 102, 241, 0.04);
  --header-bg: rgba(248, 250, 252, 0.8);
  --form-bg: rgba(255, 255, 255, 0.7);
  --overlay-subtle: rgba(99, 102, 241, 0.03);
  --overlay-hover: rgba(99, 102, 241, 0.05);
  --divider-color: rgba(99, 102, 241, 0.06);
}

/* Model-Specific Themes (Dynamically applied via body classes) */
body.theme-gemini {
  --accent-color: #7c3aed;
  --accent-rgb: 124, 58, 237;
  --accent-glow: rgba(124, 58, 237, 0.12);
  --gradient-glow: linear-gradient(135deg, #7c3aed, #a855f7);
}

body.theme-claude {
  --accent-color: #ec4899;
  --accent-rgb: 236, 72, 153;
  --accent-glow: rgba(236, 72, 153, 0.12);
  --gradient-glow: linear-gradient(135deg, #ec4899, #f472b6);
}

body.theme-chatgpt {
  --accent-color: #06b6d4;
  --accent-rgb: 6, 182, 212;
  --accent-glow: rgba(6, 182, 212, 0.12);
  --gradient-glow: linear-gradient(135deg, #06b6d4, #22d3ee);
}

body.theme-groq {
  --accent-color: #6366f1;
  --accent-rgb: 99, 102, 241;
  --accent-glow: rgba(99, 102, 241, 0.1);
  --gradient-glow: linear-gradient(135deg, #6366f1, #ec4899);
}

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

html,
body {
  height: 100%;
  height: 100dvh;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  overflow: hidden;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.12);
  border-radius: 99px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.22);
}

/* Layout App Container */
.app-container {
  display: flex;
  height: 100vh;
  height: 100dvh;
  width: 100vw;
  position: relative;
  overflow: hidden;
  max-width: 100%;
}

/* ================== Sidebar ================== */
.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 100;
  transition: var(--transition-smooth);
}

.sidebar-header {
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--divider-color);
}

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

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-glow);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: 0 0 16px rgba(var(--accent-rgb), 0.3);
  transition: var(--transition-smooth);
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.close-sidebar-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.new-chat-btn {
  margin: 1.25rem;
  background: var(--overlay-hover);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: 99px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.new-chat-btn:hover {
  background: rgba(var(--accent-rgb), 0.08);
  border-color: var(--accent-color);
  box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.15);
}

.btn-icon {
  font-size: 1.2rem;
  line-height: 1;
}

.chat-history-container {
  flex: 1;
  overflow-y: auto;
  padding: 0 1.25rem 1.25rem;
}

.history-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.chat-history-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0.8rem;
  border-radius: 99px;
  cursor: pointer;
  transition: var(--transition-fast);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  position: relative;
}

.history-item:hover {
  background: var(--overlay-subtle);
  color: var(--text-main);
}

.history-item.active {
  background: rgba(var(--accent-rgb), 0.05);
  border-color: rgba(var(--accent-rgb), 0.2);
  color: var(--text-main);
  font-weight: 600;
}

.history-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  padding-right: 0.75rem;
}

.delete-chat-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  opacity: 0;
  font-size: 1rem;
  transition: var(--transition-fast);
  padding: 2px 6px;
  border-radius: 50%;
}

.history-item:hover .delete-chat-btn {
  opacity: 1;
}

.delete-chat-btn:hover {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

.sidebar-footer {
  padding: 1.25rem;
  border-top: 1px solid var(--divider-color);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-action-btn,
.back-portfolio-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 99px;
  background: none;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
}

.footer-action-btn:hover {
  background: var(--overlay-subtle);
  color: var(--text-main);
}

.back-portfolio-btn:hover {
  background: var(--overlay-subtle);
  color: var(--accent-color);
}

.footer-action-btn .icon,
.back-portfolio-btn .icon {
  flex-shrink: 0;
}

/* ================== Chat Main Workspace ================== */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  background-color: var(--bg-dark);
  min-width: 0;
  overflow-x: hidden;
}

/* Ambient glow blobs */
.chat-main::before {
  content: '';
  position: absolute;
  top: -10%;
  right: 15%;
  width: 40%;
  height: 40%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: 1;
  pointer-events: none;
  transition: var(--transition-smooth);
}

/* Top Header */
.chat-header {
  height: 70px;
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  background-color: var(--header-bg);
  z-index: 50;
  flex-shrink: 0;
  position: relative;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-width: 0;
  flex-shrink: 1;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.menu-toggle-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 20px;
  height: 14px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.menu-toggle-btn span {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 99px;
  transition: var(--transition-fast);
}

.model-select-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  min-width: 0;
  flex-shrink: 1;
}

.model-select {
  -webkit-appearance: none;
  appearance: none;
  background: var(--overlay-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.6rem 2.5rem 0.6rem 1.25rem;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-fast);
  outline: none;
  min-width: 0;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.model-select:hover,
.model-select:focus {
  border-color: var(--accent-color);
  background: var(--overlay-hover);
  box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.1);
}

.model-select-arrow {
  position: absolute;
  right: 1.25rem;
  font-size: 0.65rem;
  pointer-events: none;
  color: var(--text-muted);
}

/* Theme Toggle Slider */
.theme-toggle-container {
  --theme-btn-w: 34px;
  --theme-btn-h: 30px;
  --theme-gap: 2px;
  --theme-pad: 3px;
  display: flex;
  align-items: center;
  gap: var(--theme-gap);
  background: var(--overlay-subtle);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  padding: var(--theme-pad);
  position: relative;
  transition: var(--transition-fast);
}

.theme-btn {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: var(--theme-btn-w);
  height: var(--theme-btn-h);
  border-radius: 99px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-dim);
  transition: color 0.3s ease;
}

.theme-btn:hover {
  color: var(--text-main);
}

.theme-btn.active {
  color: #fff;
}

.theme-btn svg {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-btn:hover svg {
  transform: scale(1.15);
}

.theme-btn.active svg {
  transform: scale(1.1);
  filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.3));
}

.theme-slider-track {
  position: absolute;
  z-index: 1;
  width: var(--theme-btn-w);
  height: var(--theme-btn-h);
  border-radius: 99px;
  background: var(--accent-color);
  box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.35);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
    background 0.3s ease,
    box-shadow 0.3s ease;
  left: var(--theme-pad);
  top: var(--theme-pad);
  transform: translateX(0);
}

/* Dark mode scrollbar overrides */
body.theme-mode-dark ::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
}

body.theme-mode-dark ::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Status Badge */
.status-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid transparent;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.mode-simulator {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.2);
  color: #f59e0b;
}

.mode-simulator .status-dot {
  background-color: #f59e0b;
  box-shadow: 0 0 8px #f59e0b;
}

.mode-live {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.2);
  color: #10b981;
}

.mode-live .status-dot {
  background-color: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% {
    transform: scale(0.9);
    opacity: 0.7;
  }

  50% {
    transform: scale(1.1);
    opacity: 1;
    box-shadow: 0 0 12px #10b981;
  }

  100% {
    transform: scale(0.9);
    opacity: 0.7;
  }
}

/* ================= Messages Viewport ================= */
.messages-viewport {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
}

/* Welcome Screen */
.welcome-screen {
  margin: auto;
  max-width: 800px;
  width: 100%;
  text-align: center;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.welcome-logo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gradient-glow);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 2.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 0 32px rgba(var(--accent-rgb), 0.4);
  transition: var(--transition-smooth);
}

.welcome-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.welcome-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 3rem;
  line-height: 1.5;
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  width: 100%;
  text-align: left;
}

.prompt-card {
  background: var(--overlay-subtle);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 24px;
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.prompt-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-main);
}

.prompt-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.prompt-go {
  position: absolute;
  bottom: 1.25rem;
  right: 1.25rem;
  font-size: 1.15rem;
  color: var(--text-dim);
  opacity: 0;
  transition: var(--transition-fast);
}

.prompt-card:hover {
  background: rgba(var(--accent-rgb), 0.03);
  border-color: rgba(var(--accent-rgb), 0.2);
  transform: translateY(-2px);
}

.prompt-card:hover .prompt-go {
  opacity: 1;
  color: var(--accent-color);
  transform: translateX(3px);
}

/* Conversation Feed */
.conversation-feed {
  max-width: 850px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-width: 0;
  overflow-x: hidden;
}

/* Chat Message Bubbles */
.message {
  display: flex;
  gap: 1.25rem;
  width: 100%;
  min-width: 0;
  animation: fadeInMsg 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeInMsg {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1rem;
}

.message-bubble {
  flex: 1;
  max-width: calc(100% - 50px);
  min-width: 0;
  overflow-x: hidden;
}

.message-sender {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.message-content {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
  overflow-wrap: break-word;
  word-break: break-word;
}

.message-content p {
  margin-bottom: 0.8rem;
}

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

.message-content ul,
.message-content ol {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
}

.message-content li {
  margin-bottom: 0.25rem;
}

/* User Message Specifics */
.message.user-message {
  flex-direction: row-reverse;
}

.message.user-message .message-avatar {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.message.user-message .message-bubble {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.message.user-message .message-content {
  background: var(--overlay-subtle);
  border: 1px solid var(--border-color);
  padding: 0.9rem 1.25rem;
  border-radius: 24px 8px 24px 24px;
  max-width: 85%;
}

/* Assistant Message Specifics */
.message.assistant-message .message-avatar {
  background: var(--gradient-glow);
  color: #fff;
  box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.2);
}

.message.assistant-message .message-content {
  background: transparent;
  padding: 0;
  border-radius: 0;
}

/* Code Syntax Highlighting Blocks */
pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
  position: relative;
  max-width: 100%;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-color);
}

/* Inline Code block */
p code {
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.35rem;
  border-radius: 8px;
  color: var(--accent-color);
}

.code-header {
  background: var(--code-header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: 16px 16px 0 0;
  margin: 1rem 0 -1rem;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--text-muted);
}

.code-header+pre {
  border-top: 0;
  border-radius: 0 0 16px 16px;
}

.copy-code-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.2rem 0.5rem;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.copy-code-btn:hover {
  background: var(--overlay-hover);
  color: var(--text-main);
  border-color: var(--accent-color);
}

/* Typing Skeleton Loader */
.typing-indicator {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 0.5rem 0;
}

.typing-dot {
  width: 6px;
  height: 6px;
  background-color: var(--text-muted);
  border-radius: 50%;
  animation: bounceDot 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounceDot {

  0%,
  80%,
  100% {
    transform: scale(0.6);
    opacity: 0.4;
  }

  45% {
    transform: scale(1.1);
    opacity: 1;
  }
}

/* ================== Input Area ================== */
.input-container {
  padding: 1.5rem 2rem calc(2.5rem + env(safe-area-inset-bottom, 0px));
  z-index: 50;
  flex-shrink: 0;
}

.input-panel {
  max-width: 850px;
  width: 100%;
  margin: 0 auto;
}

.chat-form {
  background-color: var(--form-bg);
  border: 1px solid var(--border-color);
  border-radius: 28px;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.chat-form:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 16px rgba(var(--accent-rgb), 0.15);
}

.chat-textarea {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  resize: none;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  max-height: 200px;
  min-height: 24px;
  line-height: 14px;
  padding: 2px 0;
}

.chat-textarea::placeholder {
  text-align: left;
  color: var(--text-dim);
}

.send-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-glow);
  color: #fff;
  border: none;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: var(--transition-fast);
  flex-shrink: 0;
  box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.25);
}

.send-btn:hover {
  transform: scale(1.04);
  box-shadow: 0 0 16px rgba(var(--accent-rgb), 0.4);
}

.send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

.input-info {
  margin-top: 0.5rem;
  padding: 0 0.5rem;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 500;
}

.info-divider {
  margin: 0 0.5rem;
}

/* ================= Settings Overlay Modal ================= */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(5, 5, 8, 0.8);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  display: none;
  place-items: center;
  z-index: 1000;
  padding: 1.5rem;
  animation: fadeInBackdrop 0.3s ease;
}

.modal-backdrop.show {
  display: grid;
}

@keyframes fadeInBackdrop {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.modal-card {
  background: var(--modal-bg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  border-radius: 28px;
  max-width: 550px;
  width: 100%;
  overflow: hidden;
  animation: slideInCard 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes slideInCard {
  from {
    transform: translateY(30px) scale(0.95);
    opacity: 0;
  }

  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

.modal-header {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--divider-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-height: 70vh;
  overflow-y: auto;
}

.modal-intro {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.setting-row {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.setting-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toggle-mode-wrapper {
  display: flex;
  background: var(--toggle-mode-bg);
  padding: 4px;
  border-radius: 99px;
  border: 1px solid var(--border-color);
}

.mode-option {
  flex: 1;
  cursor: pointer;
}

.mode-option input[type="radio"] {
  display: none;
}

.mode-box {
  display: block;
  text-align: center;
  padding: 0.6rem;
  border-radius: 99px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.mode-option input[type="radio"]:checked+.mode-box {
  background: var(--accent-color);
  color: #fff;
  box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.2);
}

#modeSimRadio:checked+.mode-box {
  background: #f59e0b;
  color: #fff;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
}

.divider {
  height: 1px;
  background: var(--border-color);
}

.keys-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: var(--transition-fast);
}

.keys-section.disabled {
  opacity: 0.35;
  pointer-events: none;
}

.key-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.field-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.field-link {
  font-size: 0.75rem;
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-fast);
}

.field-link:hover {
  text-decoration: underline;
}

.input-password-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.input-password-wrapper_Groq{
  visibility: hidden;
}

.key-input {
  width: 100%;
  background: var(--toggle-mode-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  outline: none;
  transition: var(--transition-fast);
}

.key-input:focus {
  border-color: var(--accent-color);
  background: var(--toggle-mode-bg);
}

.toggle-key-visibility {
  position: absolute;
  right: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-dim);
  font-size: 1rem;
}

.toggle-key-visibility:hover {
  color: var(--text-main);
}

.field-desc {
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

.modal-footer {
  padding: 1.25rem 1.75rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.modal-btn {
  padding: 0.75rem 1.5rem;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-fast);
  border: none;
}

.btn-cancel {
  background: var(--btn-cancel-bg);
  color: var(--text-muted);
}

.btn-cancel:hover {
  background: var(--btn-cancel-hover);
  color: var(--text-main);
}

.btn-save {
  background: var(--gradient-glow);
  color: #fff;
  box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.25);
}

.btn-save:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 16px rgba(var(--accent-rgb), 0.4);
}

/* Custom Theme Select styling */
.theme-select {
  -webkit-appearance: none;
  appearance: none;
  background: var(--toggle-mode-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  outline: none;
  width: 100%;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-select:focus {
  border-color: var(--accent-color);
  background: var(--toggle-mode-bg);
}

/* ================== Responsive Breakpoints ================== */
@media (max-width: 991px) {

  /* Toggle Sidebar in overlay mode */
  .sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    bottom: 0;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.show {
    left: 0;
  }

  .close-sidebar-btn {
    display: block;
  }

  .menu-toggle-btn {
    display: flex;
  }

  .messages-viewport {
    padding: 1.5rem 1.25rem;
  }

  .input-container {
    padding: 1rem 1.25rem calc(2rem + env(safe-area-inset-bottom, 0px));
  }
}

@media (max-width: 640px) {
  .prompt-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .welcome-title {
    font-size: 1.75rem;
  }

  .chat-header {
    padding: 0 0.75rem;
    gap: 0.5rem;
  }

  .header-left {
    gap: 0.5rem;
  }

  .header-right {
    gap: 0.4rem;
  }

  .model-select {
    font-size: 0.8rem;
    padding: 0.45rem 1.75rem 0.45rem 0.75rem;
    max-width: 140px;
  }

  .model-select-arrow {
    right: 0.75rem;
  }

  .theme-toggle-container {
    --theme-btn-w: 28px;
    --theme-btn-h: 26px;
    --theme-gap: 1px;
    --theme-pad: 2px;
  }

  .status-badge {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
  }

  .status-text {
    display: none;
  }

  .status-dot {
    width: 5px;
    height: 5px;
  }

  .message {
    gap: 0.75rem;
  }

  .message-avatar {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }

  .message-bubble {
    max-width: calc(100% - 40px);
  }

  .message.user-message .message-content {
    max-width: 100%;
    padding: 0.75rem 1rem;
  }

  .message-content {
    font-size: 0.9rem;
  }

  .conversation-feed {
    gap: 1.25rem;
  }

  .messages-viewport {
    padding: 1rem 0.75rem;
  }

  .input-container {
    padding: 0.75rem 0.75rem calc(1.5rem + env(safe-area-inset-bottom, 0px));
  }

  .prompt-card {
    padding: 1rem;
  }

  .welcome-desc {
    font-size: 0.85rem;
    padding: 0 0.5rem;
  }
}