/* ============================================
   Voice Assistant - Modern UI Styles
   ============================================ */

/* CSS Custom Properties */
:root {
  /* Colors - Glassmorphism Theme */
  --color-primary: #8b5cf6; /* Violet */
  --color-primary-hover: #7c3aed;
  --color-primary-light: rgba(139, 92, 246, 0.1);
  --color-primary-glow: rgba(139, 92, 246, 0.4);

  --color-accent: #06b6d4; /* Cyan */
  --color-accent-glow: rgba(6, 182, 212, 0.4);

  --color-success: #10b981;
  --color-success-light: rgba(16, 185, 129, 0.1);
  --color-warning: #f59e0b;
  --color-warning-light: rgba(245, 158, 11, 0.1);
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-danger-light: rgba(239, 68, 68, 0.1);

  --color-bg: #f8fafc;
  --color-bg-card: rgba(255, 255, 255, 0.7);
  --color-bg-elevated: rgba(255, 255, 255, 0.85);
  --color-bg-conversation: rgba(255, 255, 255, 0.4);

  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
  --glass-blur: blur(12px);

  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #f8fafc;

  --color-border: rgba(226, 232, 240, 0.6);
  --color-border-focus: var(--color-primary);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 20px var(--color-primary-glow);
  --shadow-glass:
    0 4px 6px -1px rgba(0, 0, 0, 0.05),
    0 2px 4px -1px rgba(0, 0, 0, 0.03),
    inset 0 0 0 1px rgba(255, 255, 255, 0.4);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index layers */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-fab: 500;
}

/* ============================================
   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-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background:
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(244, 63, 94, 0.1) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(16, 185, 129, 0.1) 0px, transparent 50%),
    var(--color-bg);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

body.panel-open {
  overflow: hidden;
}

/* ============================================
   App Container
   ============================================ */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================
   Header
   ============================================ */
.app-header {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  padding: var(--space-md) var(--space-lg);
}

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

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

/* Connection Status */
.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  background: var(--color-bg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

.connection-status.connected {
  background: var(--color-success-light);
  color: #065f46;
}

.connection-status.connecting {
  background: var(--color-warning-light);
  color: #92400e;
}

/* Header End Chat Button */
.btn-small {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-sm);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-muted);
  transition: all var(--transition-base);
}

.status-dot.connected {
  background: var(--color-success);
  box-shadow: 0 0 8px var(--color-success);
}

.status-dot.connecting {
  background: var(--color-warning);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

/* ============================================
   Main Content Layout
   ============================================ */
.main-content {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-lg);
  padding: var(--space-lg);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* ============================================
   Conversation Section
   ============================================ */
.conversation-section {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.conversation-container {
  flex: 1;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  overflow-y: auto;
  min-height: 500px;
  max-height: calc(100vh - 200px);
  box-shadow: var(--shadow-glass);
}

/* Welcome Message */
.welcome-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
  min-height: 400px;
  color: var(--color-text);
}

.welcome-icon {
  width: 110px;
  height: 110px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xl);
  box-shadow: 0 10px 40px -5px rgba(139, 92, 246, 0.5), 0 0 0 0 rgba(139, 92, 246, 0.3);
  border: 3px solid rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: all var(--transition-base);
  animation: welcomePulse 2.5s ease-in-out infinite;
  position: relative;
}

.welcome-icon::before,
.welcome-icon::after {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px solid rgba(139, 92, 246, 0.3);
  animation: welcomeRipple 2.5s ease-in-out infinite;
}

.welcome-icon::after {
  inset: -20px;
  border-color: rgba(139, 92, 246, 0.15);
  animation-delay: 0.4s;
}

@keyframes welcomePulse {
  0%, 100% {
    box-shadow: 0 10px 40px -5px rgba(139, 92, 246, 0.5), 0 0 0 0 rgba(139, 92, 246, 0.3);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 15px 50px -5px rgba(139, 92, 246, 0.6), 0 0 40px 8px rgba(139, 92, 246, 0.2);
    transform: scale(1.08);
  }
}

@keyframes welcomeRipple {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.4;
  }
}

.welcome-icon:hover {
  transform: scale(1.15);
  box-shadow: 0 20px 50px -5px rgba(139, 92, 246, 0.6);
  animation: none;
}

.welcome-icon:hover::before,
.welcome-icon:hover::after {
  animation: none;
  opacity: 0;
}

.welcome-icon:active {
  transform: scale(0.98);
}

.welcome-icon svg {
  width: 48px;
  height: 48px;
  color: white;
}

.welcome-message h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  letter-spacing: -0.025em;
}

.welcome-message p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 280px;
}

/* Message Styles */
.message {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-md);
  animation: messageIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

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

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.message-avatar svg {
  width: 20px;
  height: 20px;
}

.message-user .message-avatar {
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  color: white;
}

.message-assistant .message-avatar {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: white;
}

.message-system .message-avatar {
  background: var(--color-text-muted);
  color: white;
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message-label {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-xs);
}

.message-user .message-label {
  color: var(--color-primary);
}

.message-assistant .message-label {
  color: #059669; /* Emerald 600 */
}

.message-system .message-label {
  color: var(--color-text-muted);
}

.message-text {
  font-size: var(--font-size-base);
  line-height: 1.6;
  word-wrap: break-word;
}

.message-user .message-text {
  color: var(--color-text);
}

.message-assistant .message-text {
  color: var(--color-text);
}

.message-system .message-text {
  color: var(--color-text-secondary);
  font-style: italic;
  font-size: var(--font-size-sm);
}

/* ============================================
   Control Panel
   ============================================ */
.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.panel-section {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-glass);
}

.panel-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.panel-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* Main Controls */
.main-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  outline: none;
}

.btn:focus-visible {
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.btn-large {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: white;
  box-shadow: var(--shadow-md), 0 0 0 0 var(--color-primary-glow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-danger {
  background: linear-gradient(135deg, var(--color-danger), var(--color-danger-hover));
  color: white;
}

.btn-danger:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  padding: var(--space-sm);
}

.btn-ghost:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

.btn-icon-small {
  width: 16px;
  height: 16px;
}

/* Style Cards */
.style-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.style-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: left;
  width: 100%;
}

.style-card:hover:not(:disabled) {
  background: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.style-card.active {
  background: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.style-card:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.style-icon {
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
}

.style-info {
  display: flex;
  flex-direction: column;
}

.style-name {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.style-desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Collapsible Section */
.collapsible .collapse-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  margin-bottom: 0;
}

.collapsible .collapse-toggle .panel-title {
  margin-bottom: 0;
}

.chevron {
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
  transition: transform var(--transition-base);
}

.collapsible.expanded .chevron {
  transform: rotate(180deg);
}

.collapse-content {
  display: none;
  padding-top: var(--space-md);
}

.collapsible.expanded .collapse-content {
  display: block;
}

/* Form Controls */
.option-group {
  margin-bottom: var(--space-md);
}

.option-group:last-child {
  margin-bottom: 0;
}

.option-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.select-wrapper {
  position: relative;
}

.custom-select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-right: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: var(--color-bg-card);
  appearance: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.custom-select:hover {
  border-color: var(--color-primary);
}

.custom-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.select-arrow {
  position: absolute;
  right: var(--space-sm);
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
  pointer-events: none;
}

.custom-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: var(--color-bg-card);
  resize: vertical;
  min-height: 80px;
  transition: all var(--transition-fast);
}

.custom-textarea:hover {
  border-color: var(--color-primary);
}

.custom-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.custom-textarea::placeholder {
  color: var(--color-text-muted);
}

/* Panel Footer */
.panel-footer {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-md);
  box-shadow: var(--shadow-md);
}

/* ============================================
   Mobile Hero Start Button
   ============================================ */
.mobile-hero-start {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-xl) var(--space-lg);
  padding-bottom: calc(var(--space-2xl) + env(safe-area-inset-bottom, 0px));
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  z-index: var(--z-fab);
  background: linear-gradient(to top,
    rgba(248, 250, 252, 0.98) 0%,
    rgba(248, 250, 252, 0.95) 50%,
    rgba(248, 250, 252, 0) 100%
  );
}

/* Hero Mode Selector */
.hero-mode-selector {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-xs);
  background: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.5);
  width: 100%;
  max-width: 340px;
}

.hero-mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-xs);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  flex: 1;
  min-width: 0;
  text-align: center;
}

.hero-mode-btn:hover {
  background: rgba(139, 92, 246, 0.08);
}

.hero-mode-btn.active {
  background: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.hero-mode-icon {
  font-size: 1.25rem;
  line-height: 1;
}

.hero-mode-name {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-secondary);
  line-height: 1.2;
  word-break: break-word;
  hyphens: auto;
}

.hero-mode-btn.active .hero-mode-name {
  color: var(--color-primary);
}

/* ============================================
   Mobile FAB (Floating Action Buttons)
   ============================================ */
.mobile-fab {
  display: none;
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-fab);
  gap: var(--space-sm);
  flex-direction: column-reverse;
  align-items: center;
}

.fab {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.fab svg {
  width: 24px;
  height: 24px;
}

.fab-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: white;
}

.fab-primary:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.fab-danger {
  background: linear-gradient(135deg, var(--color-danger), var(--color-danger-hover));
  color: white;
}

.fab-secondary {
  width: 56px;
  height: 56px;
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
}

.fab-secondary:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

.hidden {
  display: none !important;
}

/* ============================================
   Mobile Settings Panel
   ============================================ */
.mobile-settings-panel {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  z-index: 700;
  height: min(88vh, 760px);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.3s ease-out;
  border-top: 1px solid rgba(255, 255, 255, 0.5);
  display: flex;
  flex-direction: column;
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

.mobile-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.mobile-panel-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.close-panel {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
}

.close-panel:hover {
  background: var(--color-border);
}

.close-panel svg {
  width: 20px;
  height: 20px;
}

.mobile-panel-content {
  padding: var(--space-lg);
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.mobile-panel-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 650;
  backdrop-filter: blur(4px);
}

.mobile-option-group {
  margin-bottom: var(--space-lg);
}

.mobile-option-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.mobile-style-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mobile-style-btn {
  padding: var(--space-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-base);
}

.mobile-style-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.mobile-voice-select {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg-card);
}

.mobile-instructions {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg-card);
  resize: vertical;
  min-height: 110px;
}

.mobile-instructions::placeholder {
  color: var(--color-text-muted);
}

.mobile-style-btn:disabled,
.hero-mode-btn:disabled,
.mobile-voice-select:disabled,
.mobile-instructions:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.mobile-clear-btn {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-danger);
  cursor: pointer;
  transition: all var(--transition-base);
}

.mobile-clear-btn:hover {
  background: var(--color-danger-light);
}

/* ============================================
   Responsive Design - Tablet
   ============================================ */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr 320px;
  }
}

/* ============================================
   Responsive Design - Mobile
   ============================================ */
@media (max-width: 768px) {
  :root {
    --space-lg: 1rem;
  }

  .app-header {
    padding: var(--space-sm) var(--space-md);
  }

  .logo-text {
    font-size: var(--font-size-lg);
  }

  .logo-icon {
    width: 28px;
    height: 28px;
  }

  .main-content {
    grid-template-columns: 1fr;
    padding: var(--space-md);
    padding-bottom: 100px; /* Space for FAB */
  }

  .control-panel {
    display: none;
  }

  .mobile-fab {
    display: flex;
  }

  .mobile-hero-start {
    padding-bottom: calc(96px + env(safe-area-inset-bottom, 0px));
  }

  .mobile-hero-start:not(.hidden) {
    display: flex;
  }

  .mobile-settings-panel:not(.hidden),
  .mobile-panel-overlay:not(.hidden) {
    display: block;
  }

  .conversation-container {
    min-height: 400px;
    max-height: calc(100vh - 180px);
  }

  .welcome-message {
    min-height: 300px;
  }

  .welcome-icon {
    width: 96px;
    height: 96px;
  }

  .welcome-icon svg {
    width: 42px;
    height: 42px;
  }

  .welcome-message h2 {
    font-size: var(--font-size-xl);
  }

  .welcome-message p {
    font-size: var(--font-size-sm);
  }

  .message {
    padding: var(--space-sm);
  }

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

  .message-avatar svg {
    width: 16px;
    height: 16px;
  }
}

/* ============================================
   Small Mobile
   ============================================ */
@media (max-width: 400px) {
  .connection-status .status-label {
    display: none;
  }

  .connection-status {
    padding: var(--space-xs) var(--space-sm);
  }
}

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

/* Focus visible styles */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Hide focus ring for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* ============================================
   Scrollbar Styling
   ============================================ */
.conversation-container::-webkit-scrollbar {
  width: 6px;
}

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

.conversation-container::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-full);
}

.conversation-container::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2);
}