/* ================================================================
   PetHub UI Kit Export
   Reusable core styles: tokens, buttons, backgrounds, icons.
   ================================================================ */

:root {
  --brand-50:  #fff5f3;
  --brand-100: #ffe4e0;
  --brand-200: #ffc9c1;
  --brand-300: #ffa093;
  --brand-400: #ff7e6c;
  --brand-500: #ff6b6b;
  --brand-600: #e85555;
  --brand-700: #c54242;
  --accent-400: #4ecdc4;
  --accent-warm: #ff8e53;

  --gray-0:   #ffffff;
  --gray-50:  #f7f9fc;
  --gray-100: #eef1f6;
  --gray-150: #e5e9f0;
  --gray-300: #b9c1cf;
  --gray-500: #6c7689;
  --gray-700: #343a48;
  --gray-800: #1f2433;
  --gray-900: #0f1322;

  --color-bg: var(--gray-0);
  --color-text: var(--gray-800);
  --color-text-soft: var(--gray-500);
  --color-border: var(--gray-150);
  --color-primary: var(--brand-500);
  --color-primary-hover: var(--brand-600);

  --gradient-brand: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 100%);
  --ai-gradient: linear-gradient(135deg, #ff6b6b 0%, #d946ef 45%, #8b5cf6 100%);
  --ai-conic: conic-gradient(from var(--_a, 0deg), #ff6b6b, #d946ef, #8b5cf6, #ff6b6b);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-full: 999px;

  --shadow-sm: 0 2px 6px rgba(15, 19, 34, 0.05), 0 1px 2px rgba(15, 19, 34, 0.04);
  --shadow-md: 0 8px 16px rgba(15, 19, 34, 0.06), 0 2px 6px rgba(15, 19, 34, 0.04);
  --shadow-brand: 0 12px 32px rgba(255, 107, 107, 0.28);
  --shadow-brand-sm: 0 4px 12px rgba(255, 107, 107, 0.2);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 150ms var(--ease-out);
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  color: var(--color-primary-hover);
}

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

.surface-soft {
  background: var(--gray-50);
}

.surface-brand {
  background: var(--gradient-brand);
  color: #fff;
}

.glass {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(229, 233, 240, 0.9);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.icon {
  width: 1em;
  height: 1em;
  display: inline-block;
  vertical-align: -0.125em;
  flex-shrink: 0;
  fill: currentColor;
}

.icon-lg { width: 1.5em; height: 1.5em; }
.icon-xl { width: 2em; height: 2em; }

.btn {
  --btn-bg: var(--gray-900);
  --btn-color: #fff;
  --btn-shadow: var(--shadow-sm);
  --btn-shadow-hover: var(--shadow-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--btn-bg);
  color: var(--btn-color);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--btn-shadow);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  cursor: pointer;
}

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

.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none !important; }

.btn-primary {
  --btn-bg: var(--gradient-brand);
  --btn-color: #fff;
  --btn-shadow: var(--shadow-brand-sm);
  --btn-shadow-hover: var(--shadow-brand);
  background: var(--gradient-brand);
}

.btn-ghost {
  --btn-bg: transparent;
  --btn-color: var(--gray-800);
  --btn-shadow: none;
  --btn-shadow-hover: none;
  border: 1px solid var(--color-border);
  background: #fff;
}

.btn-secondary {
  --btn-bg: var(--accent-400);
  --btn-color: #fff;
}

.btn-small { padding: 7px 14px; font-size: 0.85rem; }
.btn-large { padding: 16px 32px; font-size: 1.05rem; border-radius: var(--radius); }
.btn-block { width: 100%; }

.btn-ai {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  border: none;
  border-radius: 999px;
  background: var(--ai-conic);
  color: #fff;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: transform 220ms var(--ease-out);
  background-size: 200% 200%;
  animation: ai-gradient-shift 6s ease infinite;
}

.btn-ai-content {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  background: linear-gradient(135deg, #1a1330 0%, #0a0b14 100%);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
}

.btn-ai-glow {
  position: absolute;
  inset: -3px;
  border-radius: 999px;
  background: var(--ai-gradient);
  filter: blur(22px);
  opacity: 0.55;
  z-index: 0;
  transition: opacity 260ms var(--ease-out);
}

.btn-ai:hover { transform: translateY(-2px); color: #fff; }
.btn-ai:hover .btn-ai-glow { opacity: 0.95; }
.btn-ai:active { transform: translateY(0); }

@keyframes ai-gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}