/* Basic Reset and Global Styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

html, body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Utility Classes (Tailwind-like for demonstration) */
.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.mx-auto { margin-left: auto; margin-right: auto; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-10 { padding-top: 2.5rem; padding-bottom: 2.5rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mr-2 { margin-right: 0.5rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.space-x-6 > * + * { margin-left: 1.5rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-8 > * + * { margin-top: 2rem; }

.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.gap-8 { gap: 2rem; }
.hidden { display: none; }
.block { display: block; }
.relative { position: relative; }
.absolute { position: absolute; }
.-translate-y-1/2 { transform: translateY(-50%); }
.top-1\/2 { top: 50%; }
.right-2 { right: 0.5rem; }
.w-full { width: 100%; }
.h-10 { height: 2.5rem; }
.inline-block { display: inline-block; }
.text-2xl { font-size: 1.5rem; }
.text-4xl { font-size: 2.25rem; }
.text-5xl { font-size: 3rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-sm { font-size: 0.875rem; }
.text-md { font-size: 1rem; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.text-blue-700 { color: #1d4ed8; }
.text-blue-900 { color: #1e3a8a; }
.text-gray-700 { color: #4b5563; }
.text-gray-800 { color: #1f2937; }
.text-gray-300 { color: #d1d5db; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-white { color: #ffffff; }
.hover\:text-blue-600:hover { color: #2563eb; }
.hover\:text-blue-900:hover { color: #1e3a8a; }
.hover\:text-white:hover { color: #ffffff; }
.hover\:bg-gray-100:hover { background-color: #f3f4f6; }
.hover\:bg-blue-700:hover { background-color: #1d4ed8; }
.bg-blue-600 { background-color: #2563eb; }
.bg-gray-800 { background-color: #1f2937; }
.bg-white { background-color: #ffffff; }
.bg-gray-700 { background-color: #374151; }
.bg-gradient-to-r { background-image: linear-gradient(to right, var(--tw-gradient-stops)); }
.from-blue-600 { --tw-gradient-from: #2563eb; --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(37, 99, 235, 0)); }
.to-purple-700 { --tw-gradient-to: #6d28d9; }
.rounded-md { border-radius: 0.375rem; }
.rounded-l-md { border-top-left-radius: 0.375rem; border-bottom-left-radius: 0.375rem; }
.rounded-r-md { border-top-right-radius: 0.375rem; border-bottom-right-radius: 0.375rem; }
.rounded-full { border-radius: 9999px; }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }
.border { border-width: 1px; }
.border-gray-300 { border-color: #d1d5db; }
.border-gray-600 { border-color: #4b5563; }
.border-gray-700 { border-color: #374151; }
.border-t { border-top-width: 1px; }
.p-2 { padding: 0.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }
.focus\:ring-2:focus { --tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color); --tw-ring-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000); box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000); }
.focus\:ring-blue-500:focus { --tw-ring-color: #3b82f6; }
.transition-colors { transition-property: color, background-color, border-color, text-decoration-color, fill, stroke; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.duration-300 { transition-duration: 300ms; }
.leading-relaxed { line-height: 1.625; }
.max-w-2xl { max-width: 42rem; }
.text-center { text-align: center; }
.group:hover .group-hover\:block { display: block; }

/* Custom Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: #2563eb; /* blue-600 */
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #1d4ed8; /* blue-700 */
}

.btn-secondary {
    background-color: #e5e7eb; /* gray-200 */
    color: #374151; /* gray-700 */
    border-color: #d1d5db; /* gray-300 */
}

.btn-secondary:hover {
    background-color: #d1d5db; /* gray-300 */
    color: #1f2937; /* gray-800 */
}

/* Header Specific Styles */
.site-header {
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: relative;
    z-index: 10;
}

.site-header .logo img {
    vertical-align: middle;
}

.main-nav ul li a, .utility-nav a {
    white-space: nowrap;
}

.main-nav .group-hover\:block {
    display: none;
}
.main-nav .group:hover .group-hover\:block {
    display: block;
}

.mobile-menu {
    border-top: 1px solid #e5e7eb;
}

/* Footer Specific Styles */
.site-footer a {
    color: inherit;
}
.site-footer a:hover {
    text-decoration: underline;
}

.footer-col h3 {
    position: relative;
    padding-bottom: 0.5rem;
}
.footer-col h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background-color: #2563eb; /* blue-600 */
}

/* Responsive adjustments */
@media (min-width: 768px) { /* md breakpoint */
    .md\:flex { display: flex; }
    .md\:hidden { display: none; }
    .md\:inline-block { display: inline-block; }
    .md\:text-5xl { font-size: 3rem; }
    .md\:text-xl { font-size: 1.25rem; }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}