How interface design begins
Interface design starts with user tasks, information and constraints. Layout and interaction should explain the current state, make information findable and show what can happen next.
Map tasks and information
Identify entry points, primary actions, required reading and possible interruptions. Content-heavy surfaces need orientation; operational surfaces need clear states and feedback. A single card layout cannot serve every task equally well.
Establish hierarchy and components
Shared typography, spacing, color and components make similar actions understandable. Important information needs more than color, and labels should communicate the effect of an action.
Preserve mobile and keyboard paths
A desktop sidebar can collapse on mobile without losing access to its content. Inputs need labels, controls need focus behavior, and explanations need direct addresses. Shrinking all the text is not responsive design.
Validate using realistic content
Long Chinese titles, English paragraphs, missing images and failures all affect layout. Record tested widths and untested situations, keeping functional verification, visual checks and human acceptance separate.