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(max-width:900px){.welcome-grid{grid-template-columns:1fr}.welcome-brand{min-height:260px}}.chat-screen{flex-direction:column;height:100vh;display:flex}.chat-header{border-bottom:1px solid var(--border);background:var(--bg);flex-shrink:0;justify-content:space-between;align-items:center;height:62px;padding:0 24px;display:flex}.chat-scroll{flex:1;padding:32px 24px 0;position:relative;overflow-y:auto}.chat-inner{max-width:820px;margin:0 auto}.empty-state-wrap{flex-direction:column;align-items:flex-start;gap:12px;max-width:480px;padding:48px 0 24px;display:flex}.empty-state-heading{font-size:calc(36px * var(--font-scale));margin:0}.empty-state-sub{color:var(--muted);font-size:calc(15px * var(--font-scale));margin:0;line-height:1.5}.scroll-latest-btn{border:1px solid var(--border);background:var(--bg-elev);width:38px;height:38px;color:var(--ink-2);box-shadow:var(--shadow-md);z-index:5;border-radius:50%;justify-content:center;align-items:center;display:flex;position:absolute;bottom:18px;left:50%;transform:translate(-50%)}.scroll-latest-btn:hover{background:var(--bg-sunken)}.composer-wrap{background:var(--bg);flex-shrink:0;padding:0 24px}.composer-inner{max-width:820px;margin:0 auto;padding:0 0 18px}.mode-row{gap:10px;display:flex}.mode-btn{border-radius:var(--r-md);border:1.5px solid var(--border);background:var(--bg-elev);color:var(--ink-2);font-size:calc(14px * var(--font-scale));flex:1;align-items:center;gap:10px;padding:14px 16px;font-weight:500;transition:all 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