/* ============================================================
   AI Chat Cloud - Global Stylesheet (style.css)
   Design tokens, themes, glassmorphism, buttons, forms,
   modals, toasts, and shared components.
   ============================================================ */

/* ---------------- Reset & Base ---------------- */

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

:root {
  /* Brand gradient */
  --brand-1: #7c3aed;
  --brand-2: #2563eb;
  --brand-3: #06b6d4;
  --brand-gradient: linear-gradient(135deg, #7c3aed 0%, #2563eb 50%, #06b6d4 100%);
  --brand-gradient-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(37, 99, 235, 0.15), rgba(6, 182, 212, 0.15));

  /* Radii */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 28px;
  --r-full: 999px;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, Monaco, monospace;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.25s;

  /* Sidebar */
  --sidebar-w: 280px;
  --sidebar-collapsed-w: 0px;
}

/* ---------------- Dark Theme (default) ---------------- */

.dark-theme {
  --bg: #0a0a0f;
  --bg-2: #11111a;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --surface-hover: rgba(255, 255, 255, 0.09);
  --glass-bg: rgba(20, 20, 30, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --text: #f4f4f5;
  --text-2: #a1a1aa;
  --text-3: #71717a;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --accent: #8b5cf6;
  --accent-2: #3b82f6;
  --accent-text: #ffffff;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --code-bg: #0d1117;
  --code-border: rgba(255, 255, 255, 0.08);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
  --glow: 0 0 40px rgba(124, 58, 237, 0.25);
}

/* ---------------- Light Theme ---------------- */

.light-theme {
  --bg: #f6f7fb;
  --bg-2: #ffffff;
  --surface: rgba(0, 0, 0, 0.02);
  --surface-2: rgba(0, 0, 0, 0.04);
  --surface-hover: rgba(0, 0, 0, 0.06);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.08);
  --text: #18181b;
  --text-2: #52525b;
  --text-3: #a1a1aa;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --accent: #7c3aed;
  --accent-2: #2563eb;
  --accent-text: #ffffff;
  --danger: #dc2626;
  --success: #059669;
  --warning: #d97706;
  --code-bg: #f1f5f9;
  --code-border: rgba(0, 0, 0, 0.1);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
  --glow: 0 0 40px rgba(124, 58, 237, 0.15);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

/* Animated gradient background blobs (global) */
body::before,
body::after {
  content: '';
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
  z-index: -1;
  pointer-events: none;
  animation: floatBlob 18s ease-in-out infinite;
}
body::before {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.4), transparent 70%);
  top: -150px;
  left: -100px;
}
body::after {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.3), transparent 70%);
  bottom: -200px;
  right: -150px;
  animation-delay: -9s;
}
.light-theme::before,
.light-theme::after {
  opacity: 0.3;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -40px) scale(1.1); }
  66% { transform: translate(-40px, 50px) scale(0.95); }
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
a:hover { color: var(--accent-2); }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: rgba(124, 58, 237, 0.35);
  color: #fff;
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--r-full);
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-3); background-clip: padding-box; }

/* ---------------- Layout Helpers ---------------- */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
}

.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------------- Buttons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  border-radius: var(--r-md);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
  border: 1px solid transparent;
  user-select: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--brand-gradient);
  color: var(--accent-text);
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.35);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.5);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--surface-hover); border-color: var(--border-strong); }

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
}
.btn-danger:hover { background: rgba(239, 68, 68, 0.25); }

.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-block { width: 100%; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  color: var(--text-2);
  transition: all var(--dur) var(--ease);
}
.icon-btn:hover { background: var(--surface-hover); color: var(--text); }
.icon-btn svg { width: 18px; height: 18px; }

/* ---------------- Forms ---------------- */

.field { margin-bottom: var(--space-5); }
.field-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.input, .textarea, .select {
  width: 100%;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text);
  font-size: 0.95rem;
  transition: all var(--dur) var(--ease);
  outline: none;
}
.input::placeholder, .textarea::placeholder { color: var(--text-3); }
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--accent);
  background: var(--surface-2);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}
.textarea { resize: vertical; min-height: 80px; line-height: 1.5; }

.select {
  appearance: none;
  -webkit-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='%23a1a1aa' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}
.select option { background: var(--bg-2); color: var(--text); }

/* Range slider */
.range-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.range-value {
  min-width: 38px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--surface-2);
  border-radius: var(--r-full);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--brand-gradient);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(124, 58, 237, 0.4);
  transition: transform var(--dur) var(--ease);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

/* Password field with toggle */
.password-field { position: relative; }
.password-field .input { padding-right: 44px; }
.toggle-api-key {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  color: var(--text-3);
}
.toggle-api-key:hover { color: var(--text); background: var(--surface-hover); }
.toggle-api-key svg { width: 18px; height: 18px; }

/* ---------------- Modals ---------------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}
.modal {
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.97);
  transition: transform var(--dur) var(--ease);
}
.modal-overlay.active .modal { transform: translateY(0) scale(1); }

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}
.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
}
.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  color: var(--text-2);
  transition: all var(--dur) var(--ease);
}
.modal-close:hover { background: var(--surface-hover); color: var(--text); }
.modal-close svg { width: 20px; height: 20px; }

.modal-body { margin-bottom: var(--space-5); }
.modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}
.confirm-text { color: var(--text-2); }

body.modal-open { overflow: hidden; }

/* ---------------- Toasts ---------------- */

.toast-container {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 12px 18px;
  border-radius: var(--r-md);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  min-width: 240px;
  max-width: 360px;
  transform: translateX(120%);
  opacity: 0;
  transition: all 0.35s var(--ease);
  pointer-events: auto;
}
.toast.show { transform: translateX(0); opacity: 1; }
.toast-icon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.toast-success .toast-icon { background: var(--success); }
.toast-error .toast-icon { background: var(--danger); }
.toast-info .toast-icon { background: var(--accent); }
.toast-warning .toast-icon { background: var(--warning); }

/* ---------------- Connection Status ---------------- */

.connection-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px;
  border-radius: var(--r-full);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
}
.connection-status .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-3);
}
.connection-status.connected .status-dot {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s infinite;
}
.connection-status.disconnected .status-dot { background: var(--danger); }

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

/* ---------------- Code Blocks (shared) ---------------- */

.code-block {
  margin: var(--space-4) 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--code-border);
  background: var(--code-bg);
}
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--code-border);
}
.code-lang {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-3);
  text-transform: lowercase;
  letter-spacing: 0.05em;
}
.copy-code-btn {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-2);
  padding: 4px 10px;
  border-radius: var(--r-sm);
  transition: all var(--dur) var(--ease);
}
.copy-code-btn:hover { color: var(--text); background: var(--surface-hover); }
.copy-code-btn.copied { color: var(--success); }
.code-block pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
}
.code-block code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: #e6e6e6;
}
.light-theme .code-block code { color: #1f2937; }

.inline-code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
}

/* ---------------- Animations ---------------- */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.fade-in { animation: fadeIn var(--dur) var(--ease) both; }
.fade-in-up { animation: fadeInUp 0.5s var(--ease) both; }

/* Loading spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ---------------- Accessibility ---------------- */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------------- Responsive ---------------- */

@media (max-width: 768px) {
  .container { padding: 0 var(--space-4); }
  .toast-container { left: var(--space-4); right: var(--space-4); bottom: var(--space-4); }
  .toast { max-width: none; min-width: 0; }
  .modal { padding: var(--space-5); }
}

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