header { 
    position: absolute; width: 95%; max-width: 600px;
    display: flex; justify-content: space-between; align-items: center;
    padding: 8px 16px 8px 24px; box-sizing: border-box; border-radius: 14px; z-index: 100; height: 68px;
    transition: none;
}

.brand-title { font-weight: 800; font-size: 1.2rem; letter-spacing: -0.5px; display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 24px; height: 24px; color: var(--primary); flex-shrink: 0; }
.dev-badge { background: var(--primary-soft); color: var(--primary); font-size: 0.6rem; font-weight: 700; padding: 4px 10px; border-radius: 12px; }
.header-actions { display: flex; gap: 6px; }

.btn-icon-only {
    width: 44px; height: 44px; border-radius: 50%; background: var(--btn-bg); border: 1px solid var(--border); 
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; transition: all 0.15s ease; color: var(--text);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.9), 0 5px 15px rgba(0,0,0,0.06);
}
.btn-icon-only:hover { background: var(--surface); border-color: rgba(255,255,255,0.7); box-shadow: inset 0 1px 0 rgba(255,255,255,1), 0 6px 18px rgba(0,0,0,0.08); }
.btn-icon-only:active { box-shadow: inset 0 2px 8px rgba(0,0,0,0.08); background: var(--surface-alt); transform: scale(0.94); }
.btn-coffee:hover { background: rgba(255,193,7,0.15); border-color: rgba(255,193,7,0.3); color: #ff9500; }
.btn-coffee svg { transition: transform 0.2s ease; }
.btn-coffee:hover svg { transform: scale(1.15); }
.btn-filled { background: var(--primary); color: #fff; border: none; box-shadow: 0 8px 20px rgba(0,122,255,0.3), inset 0 1px 0 rgba(255,255,255,0.4); }