文本颜色与不透明度
应用 Tailwind 调色板中的文本颜色实用程序，并调整不透明度以建立层次和对比度。
文本颜色与不透明度 是 CoddyKit 上的免费 Tailwind CSS Academy 课时。 这是第 2 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Tailwind CSS Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Tailwind CSS Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Tailwind's Color System
Tailwind ships a rich color palette: 22 colors like blue, indigo, red, and green, each with 11 shades from 50 (near-white) to 950 (near-black). Plenty to work with.
<!-- Tailwind color naming: {color}-{shade} -->
<p class="text-blue-500">Blue 500</p>
<p class="text-blue-700">Blue 700 (darker)</p>
<p class="text-blue-200">Blue 200 (lighter)</p>Applying Text Color
Color text with text-{color}-{shade}. Low shades are light, mid are vivid, high are dark. text-gray-700 reads softly on white; text-gray-900 gives bold contrast.
<h1 class="text-gray-900">Main Heading</h1>
<h2 class="text-gray-700">Sub Heading</h2>
<p class="text-gray-600">Body text at a comfortable shade.</p>
<span class="text-gray-400">Metadata or secondary info</span>Brand Colors in Text
Use vivid shades for meaning: text-blue-600 for links, text-red-600 for errors, text-green-600 for success. These conventions feel instantly familiar to users.
<a href="#" class="text-blue-600 hover:text-blue-800 underline">Link</a>
<p class="text-red-600">Error: Invalid email address.</p>
<p class="text-green-600">Success: Changes saved!</p>
<p class="text-yellow-700">Warning: Disk space is low.</p>Text Opacity Modifier
Fade a color with the slash modifier: text-blue-600/50 shows blue at 50% opacity. It is cleaner than element opacity, which would dim the children too.
<p class="text-gray-900/100">Fully opaque</p>
<p class="text-gray-900/75">75% opacity</p>
<p class="text-gray-900/50">50% opacity</p>
<p class="text-gray-900/25">25% opacity</p>Color Contrast for Accessibility
For accessibility, text needs enough contrast — aim for a 4.5:1 ratio. Shade 700 on white usually passes; avoid light shades 50 to 400 as text on white.
<!-- Accessible: dark text on light background -->
<p class="bg-white text-gray-800">Good contrast ratio (passes WCAG AA)</p>
<!-- Inaccessible: light text on white background -->
<p class="bg-white text-gray-300">Poor contrast (fails WCAG)</p>Text Color on Dark Backgrounds
On dark backgrounds, flip the text light: text-white or text-gray-100 for primary, text-gray-400 for secondary. That is the heart of a clean dark theme.
<div class="bg-gray-900 p-8 rounded-xl">
<h2 class="text-white font-bold text-2xl mb-2">Dark Card</h2>
<p class="text-gray-400 text-sm">Secondary text on dark background.</p>
<a href="#" class="text-indigo-400 hover:text-indigo-300">Learn more</a>
</div>Gradient Text Effect
Make a gradient text effect with bg-gradient-to-r from-* to-* plus bg-clip-text text-transparent. The gradient shows only through the letters — very modern.
<h1 class="text-5xl font-extrabold bg-gradient-to-r from-purple-600 to-pink-600 bg-clip-text text-transparent">
Gradient Headline
</h1>Hover Color Changes
Add a hover: variant to change text color on hover — essential for links and buttons. Use transition-colors for a smooth fade, and pair it with focus:.
<a href="#"
class="text-gray-600 hover:text-indigo-600 focus:text-indigo-600 transition-colors duration-200 font-medium">
Hover or focus me
</a>Semantic Color Usage
Pick a semantic palette: one color for brand, red for danger, green for success, yellow for warnings. Used consistently, color teaches users at a glance.
<div class="space-y-2">
<p class="text-indigo-600 font-medium">Primary action</p>
<p class="text-red-600 font-medium">Danger / Error</p>
<p class="text-green-600 font-medium">Success / Confirmed</p>
<p class="text-yellow-700 font-medium">Warning / Caution</p>
<p class="text-gray-500 font-medium">Neutral / Disabled</p>
</div>Text Color in Dark Mode
Add a dark: prefix to any text color and it kicks in during dark mode. One line of HTML serves both your light and dark themes — no duplicate markup.
<p class="text-gray-900 dark:text-gray-100">
Adapts automatically between themes.
</p>
<p class="text-gray-500 dark:text-gray-400">
Secondary text adapts too.
</p>Using Arbitrary Color Values
Need a color outside the palette? Use brackets: text-[#ff5733] for an exact hex. Handy for brand colors, but use sparingly to keep your system consistent.
<!-- Arbitrary color (one-off brand match) -->
<span class="text-[#ff5733] font-bold">Brand Orange</span>
<!-- Better: define in config for reuse -->
/* tailwind.config.js theme.extend.colors.brand: '#ff5733' */
<span class="text-brand font-bold">Brand Orange</span>Quick Check
Quick check! See how color and opacity landed. 🎨
Lesson Recap
Great! text-{color}-{shade} taps the palette, the slash sets opacity without dimming children, and dark: handles dark mode. Next up: line height and spacing.
常见问题解答
「文本颜色与不透明度」课时是免费的吗？
是的 — 「文本颜色与不透明度」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Tailwind CSS Academy 课程的其余内容，请升级到 CoddyKit PRO。 Tailwind CSS Academy 课程共包含 4 节课。
「文本颜色与不透明度」这节课中我会学到什么？
应用 Tailwind 调色板中的文本颜色实用程序，并调整不透明度以建立层次和对比度。 你通过在浏览器中直接运行的动手代码来练习 Tailwind CSS Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Tailwind CSS Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Tailwind CSS Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 2 节课，共 4 节。
「文本颜色与不透明度」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Tailwind CSS Academy 课中编写并运行代码吗？
能。每节 Tailwind CSS Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。