/* === AgentEats Design System === */

:root {
  /* Colors */
  --color-primary: #f97316;
  --color-primary-dark: #ea580c;
  --color-primary-light: #fed7aa;
  --color-secondary: #1e293b;
  --color-accent: #06b6d4;
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f5f4;
  --color-border: #e7e5e4;
  --color-text: #1c1917;
  --color-text-muted: #78716c;
  --color-success: #22c55e;
  --color-error: #ef4444;
  --color-warning: #eab308;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);

  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* === Header / Nav === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.nav-brand span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  line-height: 1.4;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
}

.btn-secondary {
  background: var(--color-secondary);
  color: white;
}
.btn-secondary:hover {
  background: #334155;
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
}
.btn-ghost:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* === Cards === */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.card-icon-primary {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.card-icon-accent {
  background: #cffafe;
  color: #0891b2;
}

.card-icon-secondary {
  background: #e2e8f0;
  color: var(--color-secondary);
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* === Forms === */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.form-group .hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.form-checkbox input[type="checkbox"] {
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
}

.form-error {
  color: var(--color-error);
  font-size: 0.75rem;
  margin-top: var(--space-xs);
}

/* === Alerts === */
.alert {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.alert-success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-warning {
  background: #fefce8;
  color: #854d0e;
  border: 1px solid #fef08a;
}

.alert-info {
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

/* === Toast Notifications === */
.toast-container {
  position: fixed;
  top: calc(var(--header-height) + var(--space-md));
  right: var(--space-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  max-width: 360px;
  animation: toast-in 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toast-success { border-left: 3px solid var(--color-success); }
.toast-error   { border-left: 3px solid var(--color-error); }
.toast-warning { border-left: 3px solid var(--color-warning); }

@keyframes toast-in {
  from { opacity: 0; transform: translateX(100%); }
  to   { opacity: 1; transform: translateX(0); }
}

/* === Loading Spinner === */
.spinner {
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.7);
  z-index: 500;
  align-items: center;
  justify-content: center;
}

.loading-overlay.active {
  display: flex;
}

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-3xl);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}
.footer-links a:hover {
  color: var(--color-text);
}

/* === Section Helpers === */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.section-header p {
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* === Code blocks === */
code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--color-surface-alt);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
}

pre {
  background: var(--color-secondary);
  color: #e2e8f0;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.7;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* === API Key display === */
.api-key-display {
  background: var(--color-secondary);
  color: #f59e0b;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  word-break: break-all;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.api-key-display .copy-btn {
  background: rgba(255,255,255,0.1);
  border: none;
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.75rem;
  white-space: nowrap;
}

.api-key-display .copy-btn:hover {
  background: rgba(255,255,255,0.2);
}

/* === Responsive === */
@media (max-width: 768px) {
  :root {
    --space-3xl: 2.5rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .btn-lg {
    width: 100%;
  }
}