:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #ecf0f1;
    --text-color: #34495e;
    --heading-color: #2c3e50;
    --card-bg: #ffffff;
    --border-color: #bdc3c7;
    --shadow: 0 10px 20px rgba(0,0,0,0.05);
    --font-main: 'Source Sans Pro', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}
body { font-family: var(--font-main); color: var(--text-color); background-color: var(--background-color); line-height: 1.8; font-size: 16px; }
.container { max-width: 800px; margin: 0 auto; padding: 2rem; }
.site-header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 1rem; border-bottom: 1px solid var(--border-color); margin-bottom: 2rem; }
.site-title { font-size: 1.5rem; font-weight: 700; color: var(--heading-color); text-decoration: none; }
.site-nav a { margin-left: 1.5rem; color: var(--text-color); text-decoration: none; font-weight: 600; transition: color 0.2s; }
.site-nav a:hover { color: var(--primary-color); }
.site-footer { text-align: center; margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--border-color); color: #95a5a6; }
.post-card { background: var(--card-bg); border-radius: 8px; padding: 2rem; margin-bottom: 2rem; box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s; }
.post-card:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0,0,0,0.1); }
.post-title a { color: var(--heading-color); text-decoration: none; }
.post-meta { color: #95a5a6; font-size: 0.9rem; margin-bottom: 1rem; }
.read-more-btn { display: inline-block; margin-top: 1rem; color: var(--primary-color); text-decoration: none; font-weight: 700; }
.highlight { background: #272822; color: #f8f8f2; padding: 1rem; border-radius: 5px; overflow-x: auto; }
pre, code { font-family: var(--font-mono); }
.dashboard-header { background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: white; padding: 2rem; border-radius: 8px; text-align: center; margin-bottom: 2rem; }
.progress-bar-container { background: rgba(255,255,255,0.2); border-radius: 10px; height: 20px; margin-top: 1rem; }
.progress-bar { background: white; height: 100%; width: 0%; border-radius: 10px; transition: width 0.5s ease; }
.roadmap-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(50px, 1fr)); gap: 8px; }
.day-cell { background: #dde4e6; border-radius: 5px; aspect-ratio: 1 / 1; display: flex; align-items: center; justify-content: center; font-weight: 700; cursor: pointer; transition: all 0.2s ease; }
.day-cell.completed { background: var(--secondary-color); color: white; }
.day-cell.current { background: var(--primary-color); color: white; transform: scale(1.1); }