/* Basic site-wide styles and Tailwind tweaks */
html, body, #root {
  height: 100%;
}

/* Ensure smooth font rendering */
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-neutral-900);
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus visible improvements for accessibility */
*:focus-visible {
  outline: var(--border-width-base) solid var(--color-border-focus);
  outline-offset: var(--space-1);
}

/* Mobile-optimized improvements */
@media (max-width: 640px) {
  /* Improve touch targets */
  button,
  a[role="button"],
  input[type="button"],
  input[type="submit"] {
    min-height: 44px;
    min-width: 44px;
  }

  /* Prevent zoom on focus for iOS */
  input,
  select,
  textarea {
    font-size: 16px;
  }

  /* Better scrolling on mobile */
  html {
    -webkit-overflow-scrolling: touch;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* Sharper borders on high DPI displays */
  .border-2 {
    border-width: 1px;
  }
}

/* Utility example for ads container spacing fallback */
.ad-container {
  margin: 16px 0;
}

/* Custom scrollbar for webkit browsers */
::-webkit-scrollbar {
  width: var(--space-2);
  height: var(--space-2);
}

::-webkit-scrollbar-track {
  background: var(--color-neutral-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-neutral-300);
  border-radius: var(--border-radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-600);
}

/* ============================================
   设计系统工具类 (Design System Utility Classes)
   ============================================ */

/* 卡片样式 */
.card {
  background-color: var(--color-bg-primary);
  border: var(--border-width-base) solid var(--color-border-dark);
  box-shadow: var(--shadow-brutal-sm);
  padding: var(--padding-lg);
}

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

.card-xl {
  box-shadow: var(--shadow-brutal-lg);
}

/* 表单元素样式 */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  border: var(--border-width-base) solid var(--color-border-dark);
  background-color: var(--color-bg-primary);
  color: var(--color-neutral-900);
  padding: var(--padding-sm) var(--padding-md);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  transition: all 0.15s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input[type="text"]:disabled,
input[type="email"]:disabled,
input[type="password"]:disabled,
input[type="number"]:disabled,
textarea:disabled,
select:disabled {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-600);
  cursor: not-allowed;
}

/* 复选框和单选按钮 */
input[type="checkbox"],
input[type="radio"] {
  width: 1.25rem;
  height: 1.25rem;
  border: var(--border-width-base) solid var(--color-border-dark);
  accent-color: var(--color-primary-500);
  cursor: pointer;
}

/* 链接样式 */
a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-primary-700);
  text-decoration: underline;
}

/* 文本样式工具类 */
.text-heading-1 {
  font-size: var(--text-h1);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-neutral-900);
}

.text-heading-2 {
  font-size: var(--text-h2);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-neutral-900);
}

.text-heading-3 {
  font-size: var(--text-h3);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-neutral-900);
}

.text-body {
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-neutral-700);
}

.text-body-small {
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-neutral-600);
}

/* 模态框样式 */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background-color: var(--color-bg-overlay);
}

.modal-content {
  background-color: var(--color-bg-primary);
  border: var(--border-width-thick) solid var(--color-border-dark);
  box-shadow: var(--shadow-brutal-lg);
  width: 100%;
  max-width: 42rem; /* max-w-2xl */
  padding: var(--padding-xl);
  position: relative;
}

.modal-content-lg {
  max-width: 48rem; /* max-w-5xl */
}

.modal-content-sm {
  max-width: 32rem; /* max-w-lg */
}