:root { --primary: #0d9488; --bg: #f8fafc; --text: #1e293b; --card: #ffffff; --border: #e2e8f0; --container: 800px; }
[data-theme="dark"] { --bg: #0f172a; --text: #f1f5f9; --card: #1e293b; --border: #334155; }
[data-color="blue"] { --primary: #2563eb; } [data-color="red"] { --primary: #dc2626; }

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; transition: 0.3s; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; border-radius: 8px; display: block; }

.container { max-width: var(--container); margin: 0 auto; padding: 20px; }
.btn { cursor: pointer; background: none; border: none; font-size: 1.2rem; padding: 5px; }

/* Navbar */
nav { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--border); margin-bottom: 30px; }
.logo { font-weight: bold; font-size: 1.4rem; color: var(--primary); }

/* Cards & Grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 25px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; transition: transform 0.2s; }
.card:hover { transform: translateY(-5px); border-color: var(--primary); }
.card-body { padding: 20px; }
.card h3 { margin: 10px 0; font-size: 1.2rem; }
.meta { font-size: 0.85rem; opacity: 0.7; }

/* Post Detail */
.post-header { text-align: center; margin-bottom: 40px; border-bottom: 1px solid var(--border); padding-bottom: 20px; }
.badge { background: var(--primary); color: white; padding: 3px 10px; border-radius: 20px; font-size: 0.8rem; text-transform: uppercase; }
.post-content { font-size: 1.1rem; line-height: 1.8; }
.post-content h2 { margin-top: 30px; }

/* Loading */
.spinner { width: 40px; height: 40px; border: 4px solid var(--border); border-top: 4px solid var(--primary); border-radius: 50%; animation: spin 1s linear infinite; margin: 50px auto; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }