/* public/style.css */
:root {
  /* Light Theme */
  --bg-color: #ffffff;
  --surface-color: #f8f9fa;
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --accent-color: #7c5cfc;
  --accent-gradient: linear-gradient(135deg, #7c5cfc, #00c9db);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.1);
  --input-bg: #ffffff;
  --error-color: #ef4444;
  --success-color: #10b981;
}

[data-theme='dark'] {
  /* Dark Theme */
  --bg-color: #0f0f1e;
  --surface-color: #1a1a2e;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --accent-color: #7c5cfc;
  --accent-gradient: linear-gradient(135deg, #7c5cfc, #00c9db);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --input-bg: rgba(0, 0, 0, 0.2);
  --error-color: #f87171;
  --success-color: #34d399;
}

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

body {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s, color 0.3s;
}

body::-webkit-scrollbar {
  width: 8px;
}
body::-webkit-scrollbar-track {
  background: var(--bg-color);
}
body::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Utilities */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.w-full { width: 100%; }

/* Typography */
h1, h2, h3 {
  font-weight: 600;
}
.subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Components */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.input-field {
  width: 100%;
  padding: 0.75rem 1rem;
  padding-left: 2.5rem;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s;
}
.input-field:focus {
  outline: none;
  border-color: var(--accent-color);
}

.input-group {
  position: relative;
  margin-bottom: 1rem;
}
.input-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  width: 18px;
  height: 18px;
}
.input-action {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  color: var(--text-secondary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: opacity 0.2s, transform 0.1s;
}
.btn:active {
  transform: scale(0.98);
}
.btn-primary {
  background: var(--accent-gradient);
  color: white;
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}
.btn-oauth {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
}
.btn-github {
  background-color: #24292e;
  color: white;
  border: 1px solid #24292e;
}
.btn-google {
  background-color: #ffffff;
  color: #3c4043;
  border: 1px solid #dadce0;
}

/* Auth Layout */
.auth-container {
  width: 100%;
  max-width: 420px;
  margin: auto;
  padding: 2rem 1rem;
}
.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}
.mesh-logo {
  font-size: 3rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}
.divider:not(:empty)::before { margin-right: .5em; }
.divider:not(:empty)::after { margin-left: .5em; }

.verification-code {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.code-box {
  width: 2.5rem;
  height: 3rem;
  text-align: center;
  font-size: 1.25rem;
  font-family: 'JetBrains Mono', monospace;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
}
.code-box:focus {
  outline: none;
  border-color: var(--accent-color);
}

.footer-actions {
  display: flex;
  justify-content: space-between;
  padding: 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.action-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
}
.action-btn:hover {
  color: var(--accent-color);
}

/* Chat Layout */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-color);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1.25rem;
}
.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 100;
}
.badge {
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.user-dropdown {
  position: relative;
  cursor: pointer;
}
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  position: relative;
}

.chat-area {
  flex: 1;
  padding: 2rem 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.welcome-msg {
  text-align: center;
  color: var(--text-secondary);
  margin-top: 4rem;
  font-size: 1.5rem;
  font-weight: 500;
}

/* Input Area */
.input-area-wrapper {
  padding: 1rem;
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
}
.input-area {
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.upload-row {
  display: flex;
  gap: 0.5rem;
}
.upload-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.upload-btn:hover {
  background-color: var(--surface-color);
  color: var(--text-primary);
}
.attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.file-chip {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.file-chip-close {
  cursor: pointer;
  color: var(--text-secondary);
}
.file-chip-close:hover {
  color: var(--error-color);
}
.input-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.mesh-bg {
  position: relative;
}
.mesh-bg[data-theme='dark'] {
  background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -12px -12px;
}

.status-tooltip-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.custom-tooltip {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 12px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  z-index: 200;
}
.status-tooltip-wrapper:hover .custom-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateY(-4px);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--success-color);
  box-shadow: 0 0 6px var(--success-color);
  margin-left: 0.5rem;
  animation: pulse-dot 2s infinite;
  cursor: help;
}
@keyframes pulse-dot { 0% { opacity: 0.5; } 50% { opacity: 1; } 100% { opacity: 0.5; } }

.suggested-prompts {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  margin-top: 2rem;
  animation: fadeIn 0.5s ease-out;
}
.prompt-card {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  max-width: 90%;
  text-align: center;
}
.prompt-card:hover {
  border-color: var(--accent-color);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.popover-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.attach-btn {
  color: var(--text-secondary);
  transition: color 0.2s;
}
.attach-btn:hover, .attach-btn.active {
  color: var(--accent-color);
}
.upload-popover {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 120px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 100;
  animation: slideUp 0.1s ease-out;
}
.upload-popover .upload-btn {
  justify-content: flex-start;
  padding: 0.5rem;
  border: none;
  background: transparent;
  width: 100%;
}
.upload-popover .upload-btn:hover {
  background: var(--glass-bg);
}

.input-actions-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.5rem;
}
.prefs-btn-inline {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem;
  transition: color 0.2s;
  display: flex;
}
.prefs-btn-inline:hover {
  color: var(--text-primary);
}
.est-cost {
  font-size: 0.7rem;
  color: var(--text-secondary);
  white-space: nowrap;
  font-family: 'JetBrains Mono', monospace;
}

.dropdown-menu {
  position: absolute;
  right: 0;
  top: 100%;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  margin-top: 5px;
}
.dropdown-title {
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  text-transform: uppercase;
}
.dropdown-empty {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 0.5rem;
  text-align: center;
}
.dropdown-divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 0.25rem 0;
}
.dropdown-item {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-primary);
  padding: 0.5rem;
  cursor: pointer;
  border-radius: 4px;
}
.dropdown-item:hover {
  background: var(--glass-bg);
}
.credits-dropdown-wrapper {
  position: relative;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.chat-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  resize: none;
  max-height: 150px;
  padding: 0.5rem 0;
}
.chat-input:focus {
  outline: none;
}
.send-btn {
  background: var(--accent-gradient);
  color: white;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Preferences */
.prefs-toggle {
  display: none;
}
.prefs-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.85rem;
}
.prefs-panel {
  display: none;
  padding: 1rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-top: 0.5rem;
  gap: 1rem;
}
.prefs-panel.active {
  display: flex;
}
.pref-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.pref-group label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.pref-select {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

/* Messages */
.message-bubble {
  max-width: 85%;
  padding: 1rem;
  border-radius: 12px;
  animation: fadeIn 0.3s ease-in-out;
}
.message-bubble.user {
  background: var(--surface-color);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.message-bubble.ai {
  background: transparent;
  align-self: flex-start;
  padding-left: 0;
}

/* Turnstile */
.cf-turnstile {
  margin-bottom: 1rem;
  display: flex;
  justify-content: center;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toast {
  padding: 12px 20px;
  border-radius: 6px;
  color: white;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  animation: slideIn 0.3s forwards;
}
.toast.error { background-color: var(--error-color); }
.toast.success { background-color: var(--success-color); }

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  visibility: hidden;
  opacity: 0;
  transition: all 0.3s;
}
.modal-overlay.active {
  visibility: visible;
  opacity: 1;
}
.modal {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
.modal-title { margin-bottom: 1rem; font-size: 1.25rem; }
.modal-body { color: var(--text-secondary); margin-bottom: 1.5rem; }
.modal-footer { display: flex; justify-content: flex-end; gap: 0.5rem; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

/* Breakpoints */
@media (max-width: 768px) {
  .header { padding: 1rem; }
  .chat-container { max-width: 100%; }
}