/* ============================================================
   Tailwind utility shim — output.css 内的 purge 漏掉的类
   重要补齐：footer / contact / about 中用到的 size / spacing / svg 工具类
   ============================================================ */

/* width */
.w-5 { width: 1.25rem; }
.w-6 { width: 1.5rem; }
.w-8 { width: 2rem; }
.w-10 { width: 2.5rem; }
.w-12 { width: 3rem; }
.w-14 { width: 3.5rem; }
.w-16 { width: 4rem; }
.w-20 { width: 5rem; }
.w-32 { width: 8rem; }

/* height */
.h-5 { height: 1.25rem; }
.h-6 { height: 1.5rem; }
.h-8 { height: 2rem; }
.h-10 { height: 2.5rem; }
.h-12 { height: 3rem; }
.h-14 { height: 3.5rem; }
.h-16 { height: 4rem; }
.h-32 { height: 8rem; }
.h-40 { height: 10rem; }

/* SVG fallback — 任何 24x24 viewBox 的 svg 默认 1.25rem，避免无 size 时巨大 */
svg[viewBox="0 0 24 24"]:not([width]):not([height]) {
    width: 1.25rem;
    height: 1.25rem;
}

/* flex utilities */
.flex-shrink-0 { flex-shrink: 0; }
.flex-grow-0 { flex-grow: 0; }
.flex-1 { flex: 1 1 0%; }

/* margin utilities */
.mr-3 { margin-right: 0.75rem; }
.mr-4 { margin-right: 1rem; }
.mr-2 { margin-right: 0.5rem; }
.ml-3 { margin-left: 0.75rem; }
.ml-4 { margin-left: 1rem; }
.mt-0\.5 { margin-top: 0.125rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-12 { margin-top: 3rem; }
.mt-16 { margin-top: 4rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-3 { margin-bottom: 0.75rem; }

/* padding utilities */
.p-3 { padding: 0.75rem; }
.p-5 { padding: 1.25rem; }
.p-10 { padding: 2.5rem; }
.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.pl-8 { padding-left: 2rem; }
.pt-5 { padding-top: 1.25rem; }
.pb-4 { padding-bottom: 1rem; }
.pr-2 { padding-right: 0.5rem; }

/* gap */
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-12 { gap: 3rem; }

/* space-y / space-x */
.space-y-2 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.5rem; }
.space-y-3 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.75rem; }
.space-y-6 > :not([hidden]) ~ :not([hidden]) { margin-top: 1.5rem; }
.space-x-2 > :not([hidden]) ~ :not([hidden]) { margin-left: 0.5rem; }
.space-x-6 > :not([hidden]) ~ :not([hidden]) { margin-left: 1.5rem; }

/* text */
.text-md { font-size: 1rem; line-height: 1.5rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.leading-tight { line-height: 1.25; }
.leading-relaxed { line-height: 1.625; }
.text-color-primary { color: #1e5c8a; }
.text-color-secondary { color: #475569; }

/* grid */
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* responsive grid (md / lg) */
@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:flex { display: flex; }
    .md\:flex-row { flex-direction: row; }
    .md\:hidden { display: none; }
    .md\:gap-12 { gap: 3rem; }
    .md\:p-10 { padding: 2.5rem; }
    .md\:text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
    .md\:text-5xl { font-size: 3rem; line-height: 1; }
    .md\:text-xl { font-size: 1.25rem; line-height: 1.75rem; }
    .md\:col-span-6 { grid-column: span 6 / span 6; }
}
@media (min-width: 1024px) {
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* misc */
.relative { position: relative; }
.absolute { position: absolute; }
.flex-col { flex-direction: column; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.text-blue-600 { color: #2563eb; }
.text-red-600 { color: #dc2626; }
.text-green-600 { color: #16a34a; }
.text-purple-600 { color: #9333ea; }
.text-orange-600 { color: #ea580c; }
.text-pink-600 { color: #db2777; }
.text-teal-600 { color: #0d9488; }
.text-indigo-600 { color: #4f46e5; }
.text-yellow-600 { color: #ca8a04; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-gray-100 { background-color: #f3f4f6; }
.bg-blue-50 { background-color: #eff6ff; }
.bg-blue-100 { background-color: #dbeafe; }
.bg-green-50 { background-color: #f0fdf4; }
.bg-green-100 { background-color: #dcfce7; }
.bg-purple-50 { background-color: #faf5ff; }
.bg-purple-100 { background-color: #f3e8ff; }
.bg-orange-50 { background-color: #fff7ed; }
.bg-orange-100 { background-color: #ffedd5; }
.bg-indigo-50 { background-color: #eef2ff; }
.bg-indigo-100 { background-color: #e0e7ff; }
.bg-pink-50 { background-color: #fdf2f8; }
.bg-pink-100 { background-color: #fce7f3; }
.bg-teal-50 { background-color: #f0fdfa; }
.bg-teal-100 { background-color: #ccfbf1; }
.bg-yellow-50 { background-color: #fefce8; }
.bg-red-50 { background-color: #fef2f2; }
.bg-red-100 { background-color: #fee2e2; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1f2937; }
.text-gray-900 { color: #111827; }
.bg-white { background-color: #fff; }
.border-gray-100 { border-color: #f3f4f6; }
.border-gray-200 { border-color: #e5e7eb; }
.border-gray-300 { border-color: #d1d5db; }
.border-blue-200 { border-color: #bfdbfe; }
.rounded-lg { border-radius: 0.5rem; }

/* typography for h2/h3 if not styled */
.text-color-primary { color: #1e5c8a; }