/* OpusCode Chat - Liquid Glass Dark-First Design */

/* ===== CSS Variables ===== */
:root {
  /* Dark theme (primary) */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);
  --bg-glass-active: rgba(255, 255, 255, 0.08);

  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;

  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(255, 255, 255, 0.15);

  --accent-primary: #6366f1;
  --accent-primary-glow: rgba(99, 102, 241, 0.4);
  --accent-secondary: #818cf8;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);

  --user-bubble: var(--accent-primary);
  --user-bubble-glow: var(--accent-primary-glow);
  --assistant-bubble: rgba(99, 102, 241, 0.12);
  --assistant-border: rgba(99, 102, 241, 0.2);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--accent-primary-glow);

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --blur-glass: blur(20px) saturate(180%);
  --blur-heavy: blur(40px) saturate(200%);

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-glass-hover: rgba(255, 255, 255, 0.85);
  --bg-glass-active: rgba(255, 255, 255, 0.95);

  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #9090a0;

  --border-glass: rgba(0, 0, 0, 0.08);
  --border-glass-hover: rgba(0, 0, 0, 0.15);

  --accent-primary: #6366f1;
  --accent-primary-glow: rgba(99, 102, 241, 0.3);
  --accent-secondary: #818cf8;

  --user-bubble: var(--accent-primary);
  --user-bubble-glow: rgba(99, 102, 241, 0.2);
  --assistant-bubble: rgba(0, 0, 0, 0.04);
  --assistant-border: rgba(0, 0, 0, 0.08);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 30px var(--accent-primary-glow);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100dvh;
  overflow: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background ambient effect */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-primary-glow) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(168, 85, 247, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 0% 100%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
  opacity: 0.6;
}

/* ===== App Container ===== */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 100%;
  position: relative;
}

/* ===== Header - Glass Navigation ===== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--border-glass);
  position: relative;
  z-index: 100;
  gap: 1rem;
}

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

.logo {
  font-size: 1.125rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Glass Button Base */
.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.glass-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.glass-btn:active {
  transform: translateY(0);
  background: var(--bg-glass-active);
}

/* Icon Button */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  color: var(--text-secondary);
  font-size: 1.125rem;
  cursor: pointer;
  transition: all var(--transition-base);
}

.icon-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-hover);
  color: var(--text-primary);
  transform: scale(1.05);
}

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

/* Model Select */
.model-select {
  padding: 0.5rem 2rem 0.5rem 0.875rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.625rem center;
  transition: all var(--transition-base);
}

.model-select:hover {
  border-color: var(--border-glass-hover);
  background-color: var(--bg-glass-hover);
}

.model-select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.model-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.5rem;
}

/* ===== Chat Container ===== */
.chat-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scroll-behavior: smooth;
  position: relative;
}

/* Custom Scrollbar */
.chat-container::-webkit-scrollbar {
  width: 6px;
}

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

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

.chat-container::-webkit-scrollbar-thumb:hover {
  background: var(--border-glass-hover);
}

/* ===== Messages ===== */
.messages {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}

/* Message Entry Animation */
@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes messageSlideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes messageSlideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  animation: messageSlideIn 0.4s var(--transition-base);
}

.message.user {
  align-self: flex-end;
  animation: messageSlideInRight 0.4s var(--transition-base);
}

.message.assistant {
  align-self: flex-start;
  animation: messageSlideInLeft 0.4s var(--transition-base);
}

/* Message Content */
.message-content {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  line-height: 1.6;
  word-wrap: break-word;
  font-size: 0.9375rem;
  position: relative;
}

/* User Bubble */
.message.user .message-content {
  background: var(--user-bubble);
  color: #ffffff;
  border-bottom-right-radius: var(--radius-sm);
  box-shadow: var(--shadow-md), 0 0 20px var(--user-bubble-glow);
}

/* Assistant Bubble - Glass Effect */
.message.assistant .message-content {
  background: var(--assistant-bubble);
  border: 1px solid var(--assistant-border);
  border-bottom-left-radius: var(--radius-sm);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  color: var(--text-primary);
}

/* Message Actions */
.message-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  padding: 0 0.25rem;
}

.message.user .message-actions {
  justify-content: flex-end;
}

.copy-btn {
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.copy-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-hover);
  color: var(--text-secondary);
}

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

.copy-btn.copied {
  color: #22c55e;
  border-color: rgba(34, 197, 94, 0.3);
}

/* ===== Typing Indicator ===== */
.typing-indicator {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  background: var(--assistant-bubble);
  border: 1px solid var(--assistant-border);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-sm);
  align-self: flex-start;
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
}

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

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

@keyframes bounce {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ===== Input Area - Glass Composer ===== */
.input-area {
  padding: 1rem 1.5rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-top: 1px solid var(--border-glass);
  position: relative;
}

.input-wrapper {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  transition: all var(--transition-base);
  max-width: 800px;
  margin: 0 auto;
}

.input-wrapper:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow), var(--shadow-md);
}

#message-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 1rem;
  padding: 0.625rem 0.75rem;
  resize: none;
  outline: none;
  max-height: 150px;
  min-height: 24px;
  font-family: inherit;
  line-height: 1.5;
}

#message-input::placeholder {
  color: var(--text-muted);
}

/* Send Button */
.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  color: white;
  cursor: pointer;
  transition: all var(--transition-base);
  flex-shrink: 0;
}

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

.send-btn:not(:disabled):hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.send-btn:not(:disabled):active {
  transform: scale(0.95);
}

.send-btn svg {
  width: 20px;
  height: 20px;
}

/* ===== Empty State ===== */
.empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  animation: fadeIn 0.6s var(--transition-base);
}

.empty-icon {
  font-size: 4rem;
  opacity: 0.8;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.empty-state h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: -0.02em;
}

.empty-state p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  max-width: 300px;
}

/* ===== Modal - Glass Overlay ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1.5rem;
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.3s var(--spring);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-glass);
}

.modal-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: 1.5rem;
}

.modal-body label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.modal-body input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-size: 0.9375rem;
  outline: none;
  transition: all var(--transition-base);
}

.modal-body input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

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

.help-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  line-height: 1.5;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-glass);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.btn {
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

/* ===== Utility Classes ===== */
.hidden {
  display: none !important;
}

/* ===== Responsive Design - Mobile First ===== */
@media (max-width: 640px) {
  .header {
    padding: 0.75rem 1rem;
  }

  .logo {
    font-size: 1rem;
  }

  .model-select {
    padding: 0.375rem 1.5rem 0.375rem 0.625rem;
    font-size: 0.75rem;
  }

  .icon-btn {
    width: 36px;
    height: 36px;
  }

  .chat-container {
    padding: 1rem;
  }

  .message {
    max-width: 92%;
  }

  .message-content {
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
  }

  .input-area {
    padding: 0.75rem 1rem 1rem;
  }

  .input-wrapper {
    border-radius: var(--radius-md);
  }

  #message-input {
    font-size: 16px; /* Prevents iOS zoom */
  }

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

  .empty-state .empty-icon {
    font-size: 3rem;
  }

  .empty-state h2 {
    font-size: 1.25rem;
  }

  .modal-content {
    max-width: 100%;
    margin: 1rem;
    border-radius: var(--radius-md);
  }
}

@media (max-width: 380px) {
  .header-left .logo {
    display: none;
  }

  .message {
    max-width: 95%;
  }

  .typing-indicator {
    padding: 0.75rem 1rem;
  }

  .typing-indicator .dot {
    width: 6px;
    height: 6px;
  }
}

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

/* ===== Safe Area Support ===== */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .input-area {
    padding-bottom: calc(1rem + env(safe-area-inset-bottom));
  }

  .header {
    padding-top: calc(1rem + env(safe-area-inset-top));
  }
}